| Message ID | 1400640904-16847-8-git-send-email-airlied@gmail.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
This patch is a monster, but that's to be expected with MST, I suppose. :) It has some formatting issues (lines over 80 characters in length) but that can be cleaned up later (as far as I'm concerned). Otherwise I don't see anything glaring here, so... Reviewed-by: Todd Previte <tprevite@gmail.com> > Dave Airlie <mailto:airlied@gmail.com> > Tuesday, May 20, 2014 7:55 PM > From: Dave Airlie <airlied@redhat.com> > > This is the initial import of the helper for displayport multistream. > > It consists of a topology manager, init/destroy/set mst state > > It supports DP 1.2 MST sideband msg protocol handler - via hpd irqs > > connector detect and edid retrieval interface. > > It supports i2c device over DP 1.2 sideband msg protocol (EDID reads only) > > bandwidth manager API via vcpi allocation and payload updating, > along with a helper to check the ACT status. > > Objects: > MST topology manager - one per toplevel MST capable GPU port - not > sure if this should be higher level again > MST branch unit - one instance per plugged branching unit - one at top > of hierarchy - others hanging from ports > MST port - one port per port reported by branching units, can have MST > units hanging from them as well. > > Changes since initial posting: > a) add a mutex responsbile for the queues, it locks the sideband and > msg slots, and msgs to transmit state > b) add worker to handle connection state change events, for MST device > chaining and hotplug > c) add a payload spinlock > d) add path sideband msg support > e) fixup enum path resources transmit > f) reduce max dpcd msg to 16, as per DP1.2 spec. > g) separate tx queue kicking from irq processing and move irq acking > back to drivers. > > Changes since v0.2: > a) reorganise code, > b) drop ACT forcing code > c) add connector naming interface using path property > d) add topology dumper helper > e) proper reference counting and lookup for ports and mstbs. > f) move tx kicking into a workq > g) add aux locking - this should be redone > h) split teardown into two parts > i) start working on documentation on interface. > > Changes since v0.3: > a) vc payload locking and tracking fixes > b) add hotplug callback into driver - replaces crazy return 1 scheme > c) txmsg + mst branch device refcount fixes > d) don't bail on mst shutdown if device is gone > e) change irq handler to take all 4 bytes of SINK_COUNT + ESI vectors > f) make DP payload updates timeout longer - observed on docking > station redock > g) add more info to debugfs dumper > > Changes since v0.4: > a) suspend/resume support > b) more debugging in debugfs > > TODO: > misc features > > Signed-off-by: Dave Airlie <airlied@redhat.com> > --- > Documentation/DocBook/drm.tmpl | 6 + > drivers/gpu/drm/Makefile | 2 +- > drivers/gpu/drm/drm_dp_mst_topology.c | 2739 > +++++++++++++++++++++++++++++++++ > include/drm/drm_dp_mst_helper.h | 507 ++++++ > 4 files changed, 3253 insertions(+), 1 deletion(-) > create mode 100644 drivers/gpu/drm/drm_dp_mst_topology.c > create mode 100644 include/drm/drm_dp_mst_helper.h > > diff --git a/Documentation/DocBook/drm.tmpl > b/Documentation/DocBook/drm.tmpl > index 83dd0b0..1883976 100644 > --- a/Documentation/DocBook/drm.tmpl > +++ b/Documentation/DocBook/drm.tmpl > @@ -2296,6 +2296,12 @@ void intel_crt_init(struct drm_device *dev) > !Edrivers/gpu/drm/drm_dp_helper.c > </sect2> > <sect2> > + <title>Display Port MST Helper Functions Reference</title> > +!Pdrivers/gpu/drm/drm_dp_mst_topology.c dp mst helper > +!Iinclude/drm/drm_dp_mst_helper.h > +!Edrivers/gpu/drm/drm_dp_mst_topology.c > + </sect2> > + <sect2> > <title>EDID Helper Functions Reference</title> > !Edrivers/gpu/drm/drm_edid.c > </sect2> > diff --git a/drivers/gpu/drm/Makefile b/drivers/gpu/drm/Makefile > index 48e38ba..712b73e 100644 > --- a/drivers/gpu/drm/Makefile > +++ b/drivers/gpu/drm/Makefile > @@ -23,7 +23,7 @@ drm-$(CONFIG_DRM_PANEL) += drm_panel.o > > drm-usb-y := drm_usb.o > > -drm_kms_helper-y := drm_crtc_helper.o drm_dp_helper.o drm_probe_helper.o > +drm_kms_helper-y := drm_crtc_helper.o drm_dp_helper.o > drm_probe_helper.o drm_dp_mst_topology.o > drm_kms_helper-$(CONFIG_DRM_LOAD_EDID_FIRMWARE) += drm_edid_load.o > drm_kms_helper-$(CONFIG_DRM_KMS_FB_HELPER) += drm_fb_helper.o > drm_kms_helper-$(CONFIG_DRM_KMS_CMA_HELPER) += drm_fb_cma_helper.o > diff --git a/drivers/gpu/drm/drm_dp_mst_topology.c > b/drivers/gpu/drm/drm_dp_mst_topology.c > new file mode 100644 > index 0000000..ebd9292 > --- /dev/null > +++ b/drivers/gpu/drm/drm_dp_mst_topology.c > @@ -0,0 +1,2739 @@ > +/* > + * Copyright © 2014 Red Hat > + * > + * Permission to use, copy, modify, distribute, and sell this > software and its > + * documentation for any purpose is hereby granted without fee, > provided that > + * the above copyright notice appear in all copies and that both that > copyright > + * notice and this permission notice appear in supporting > documentation, and > + * that the name of the copyright holders not be used in advertising or > + * publicity pertaining to distribution of the software without specific, > + * written prior permission. The copyright holders make no > representations > + * about the suitability of this software for any purpose. It is > provided "as > + * is" without express or implied warranty. > + * > + * THE COPYRIGHT HOLDERS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS > SOFTWARE, > + * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO > + * EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY SPECIAL, > INDIRECT OR > + * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM > LOSS OF USE, > + * DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER > + * TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR > PERFORMANCE > + * OF THIS SOFTWARE. > + */ > + > +#include <linux/kernel.h> > +#include <linux/delay.h> > +#include <linux/init.h> > +#include <linux/errno.h> > +#include <linux/sched.h> > +#include <linux/i2c.h> > +#include <drm/drm_dp_mst_helper.h> > +#include <drm/drmP.h> > + > +#include <drm/drm_fixed.h> > + > +/** > + * DOC: dp mst helper > + * > + * These functions contain parts of the DisplayPort 1.2a MultiStream > Transport > + * protocol. The helpers contain a topology manager and bandwidth > manager. > + * The helpers encapsulate the sending and received of sideband msgs. > + */ > +static bool dump_dp_payload_table(struct drm_dp_mst_topology_mgr *mgr, > + char *buf); > +static int test_calc_pbn_mode(void); > + > +static void drm_dp_put_port(struct drm_dp_mst_port *port); > + > +static int drm_dp_dpcd_write_payload(struct drm_dp_mst_topology_mgr *mgr, > + int id, > + struct drm_dp_payload *payload); > + > +static int drm_dp_send_dpcd_write(struct drm_dp_mst_topology_mgr *mgr, > + struct drm_dp_mst_port *port, > + int offset, int size, u8 *bytes); > + > +static int drm_dp_send_link_address(struct drm_dp_mst_topology_mgr *mgr, > + struct drm_dp_mst_branch *mstb); > +static int drm_dp_send_enum_path_resources(struct > drm_dp_mst_topology_mgr *mgr, > + struct drm_dp_mst_branch *mstb, > + struct drm_dp_mst_port *port); > +static bool drm_dp_validate_guid(struct drm_dp_mst_topology_mgr *mgr, > + u8 *guid); > + > +static int drm_dp_mst_register_i2c_bus(struct drm_dp_aux *aux); > +static void drm_dp_mst_unregister_i2c_bus(struct drm_dp_aux *aux); > +static void drm_dp_mst_kick_tx(struct drm_dp_mst_topology_mgr *mgr); > +/* sideband msg handling */ > +static u8 drm_dp_msg_header_crc4(const uint8_t *data, size_t num_nibbles) > +{ > + u8 bitmask = 0x80; > + u8 bitshift = 7; > + u8 array_index = 0; > + int number_of_bits = num_nibbles * 4; > + u8 remainder = 0; > + > + while (number_of_bits != 0) { > + number_of_bits--; > + remainder <<= 1; > + remainder |= (data[array_index] & bitmask) >> bitshift; > + bitmask >>= 1; > + bitshift--; > + if (bitmask == 0) { > + bitmask = 0x80; > + bitshift = 7; > + array_index++; > + } > + if ((remainder & 0x10) == 0x10) > + remainder ^= 0x13; > + } > + > + number_of_bits = 4; > + while (number_of_bits != 0) { > + number_of_bits--; > + remainder <<= 1; > + if ((remainder & 0x10) != 0) > + remainder ^= 0x13; > + } > + > + return remainder; > +} > + > +static u8 drm_dp_msg_data_crc4(const uint8_t *data, u8 number_of_bytes) > +{ > + u8 bitmask = 0x80; > + u8 bitshift = 7; > + u8 array_index = 0; > + int number_of_bits = number_of_bytes * 8; > + u16 remainder = 0; > + > + while (number_of_bits != 0) { > + number_of_bits--; > + remainder <<= 1; > + remainder |= (data[array_index] & bitmask) >> bitshift; > + bitmask >>= 1; > + bitshift--; > + if (bitmask == 0) { > + bitmask = 0x80; > + bitshift = 7; > + array_index++; > + } > + if ((remainder & 0x100) == 0x100) > + remainder ^= 0xd5; > + } > + > + number_of_bits = 8; > + while (number_of_bits != 0) { > + number_of_bits--; > + remainder <<= 1; > + if ((remainder & 0x100) != 0) > > + remainder ^= 0xd5; > + } > + > + return remainder & 0xff; > +} > +static inline u8 drm_dp_calc_sb_hdr_size(struct > drm_dp_sideband_msg_hdr *hdr) > +{ > + u8 size = 3; > + size += (hdr->lct / 2); > + return size; > +} > + > +static void drm_dp_encode_sideband_msg_hdr(struct > drm_dp_sideband_msg_hdr *hdr, > + u8 *buf, int *len) > +{ > + int idx = 0; > + int i; > + u8 crc4; > + buf[idx++] = ((hdr->lct & 0xf) << 4) | (hdr->lcr & 0xf); > + for (i = 0; i < (hdr->lct / 2); i++) > + buf[idx++] = hdr->rad[i]; > + buf[idx++] = (hdr->broadcast << 7) | (hdr->path_msg << 6) | > + (hdr->msg_len & 0x3f); > + buf[idx++] = (hdr->somt << 7) | (hdr->eomt << 6) | (hdr->seqno << 4); > + > + crc4 = drm_dp_msg_header_crc4(buf, (idx * 2) - 1); > + buf[idx - 1] |= (crc4 & 0xf); > + > + *len = idx; > +} > + > +static bool drm_dp_decode_sideband_msg_hdr(struct > drm_dp_sideband_msg_hdr *hdr, > + u8 *buf, int buflen, u8 *hdrlen) > +{ > + u8 crc4; > + u8 len; > + int i; > + u8 idx; > + if (buf[0] == 0) > + return false; > + len = 3; > + len += ((buf[0] & 0xf0) >> 4) / 2; > + if (len > buflen) > + return false; > + crc4 = drm_dp_msg_header_crc4(buf, (len * 2) - 1); > + > + if ((crc4 & 0xf) != (buf[len - 1] & 0xf)) { > + DRM_DEBUG_KMS("crc4 mismatch 0x%x 0x%x\n", crc4, buf[len - 1]); > + return false; > + } > + > + hdr->lct = (buf[0] & 0xf0) >> 4; > + hdr->lcr = (buf[0] & 0xf); > + idx = 1; > + for (i = 0; i < (hdr->lct / 2); i++) > + hdr->rad[i] = buf[idx++]; > + hdr->broadcast = (buf[idx] >> 7) & 0x1; > + hdr->path_msg = (buf[idx] >> 6) & 0x1; > + hdr->msg_len = buf[idx] & 0x3f; > + idx++; > + hdr->somt = (buf[idx] >> 7) & 0x1; > + hdr->eomt = (buf[idx] >> 6) & 0x1; > + hdr->seqno = (buf[idx] >> 4) & 0x1; > + idx++; > + *hdrlen = idx; > + return true; > +} > + > +static void drm_dp_encode_sideband_req(struct > drm_dp_sideband_msg_req_body *req, > + struct drm_dp_sideband_msg_tx *raw) > +{ > + int idx = 0; > + int i; > + u8 *buf = raw->msg; > + buf[idx++] = req->req_type & 0x7f; > + > + switch (req->req_type) { > + case DP_ENUM_PATH_RESOURCES: > + buf[idx] = (req->u.port_num.port_number & 0xf) << 4; > + idx++; > + break; > + case DP_ALLOCATE_PAYLOAD: > + buf[idx] = (req->u.allocate_payload.port_number & 0xf) << 4 | > + (req->u.allocate_payload.number_sdp_streams & 0xf); > + idx++; > + buf[idx] = (req->u.allocate_payload.vcpi & 0x7f); > + idx++; > + buf[idx] = (req->u.allocate_payload.pbn >> 8); > + idx++; > + buf[idx] = (req->u.allocate_payload.pbn & 0xff); > + idx++; > + for (i = 0; i < req->u.allocate_payload.number_sdp_streams / 2; i++) { > + buf[idx] = ((req->u.allocate_payload.sdp_stream_sink[i * 2] & 0xf) > << 4) | > + (req->u.allocate_payload.sdp_stream_sink[i * 2 + 1] & 0xf); > + idx++; > + } > + if (req->u.allocate_payload.number_sdp_streams & 1) { > + i = req->u.allocate_payload.number_sdp_streams - 1; > + buf[idx] = (req->u.allocate_payload.sdp_stream_sink[i] & 0xf) << 4; > + idx++; > + } > + break; > + case DP_QUERY_PAYLOAD: > + buf[idx] = (req->u.query_payload.port_number & 0xf) << 4; > + idx++; > + buf[idx] = (req->u.query_payload.vcpi & 0x7f); > + idx++; > + break; > + case DP_REMOTE_DPCD_READ: > + buf[idx] = (req->u.dpcd_read.port_number & 0xf) << 4; > + buf[idx] |= ((req->u.dpcd_read.dpcd_address & 0xf0000) >> 16) & 0xf; > + idx++; > + buf[idx] = (req->u.dpcd_read.dpcd_address & 0xff00) >> 8; > + idx++; > + buf[idx] = (req->u.dpcd_read.dpcd_address & 0xff); > + idx++; > + buf[idx] = (req->u.dpcd_read.num_bytes); > + idx++; > + break; > + > + case DP_REMOTE_DPCD_WRITE: > + buf[idx] = (req->u.dpcd_write.port_number & 0xf) << 4; > + buf[idx] |= ((req->u.dpcd_write.dpcd_address & 0xf0000) >> 16) & 0xf; > + idx++; > + buf[idx] = (req->u.dpcd_write.dpcd_address & 0xff00) >> 8; > + idx++; > + buf[idx] = (req->u.dpcd_write.dpcd_address & 0xff); > + idx++; > + buf[idx] = (req->u.dpcd_write.num_bytes); > + idx++; > + memcpy(&buf[idx], req->u.dpcd_write.bytes, req->u.dpcd_write.num_bytes); > + idx += req->u.dpcd_write.num_bytes; > + break; > + case DP_REMOTE_I2C_READ: > + buf[idx] = (req->u.i2c_read.port_number & 0xf) << 4; > + buf[idx] |= (req->u.i2c_read.num_transactions & 0x3); > + idx++; > + for (i = 0; i < (req->u.i2c_read.num_transactions & 0x3); i++) { > + buf[idx] = req->u.i2c_read.transactions[i].i2c_dev_id & 0x7f; > > + idx++; > + buf[idx] = req->u.i2c_read.transactions[i].num_bytes; > + idx++; > + memcpy(&buf[idx], req->u.i2c_read.transactions[i].bytes, > req->u.i2c_read.transactions[i].num_bytes); > + idx += req->u.i2c_read.transactions[i].num_bytes; > + > + buf[idx] = (req->u.i2c_read.transactions[i].no_stop_bit & 0x1) << 5; > + buf[idx] |= (req->u.i2c_read.transactions[i].i2c_transaction_delay & > 0xf); > + idx++; > + } > + buf[idx] = (req->u.i2c_read.read_i2c_device_id) & 0x7f; > + idx++; > + buf[idx] = (req->u.i2c_read.num_bytes_read); > + idx++; > + break; > + > + case DP_REMOTE_I2C_WRITE: > + buf[idx] = (req->u.i2c_write.port_number & 0xf) << 4; > + idx++; > + buf[idx] = (req->u.i2c_write.write_i2c_device_id) & 0x7f; > + idx++; > + buf[idx] = (req->u.i2c_write.num_bytes); > + idx++; > + memcpy(&buf[idx], req->u.i2c_write.bytes, req->u.i2c_write.num_bytes); > + idx += req->u.i2c_write.num_bytes; > + break; > + } > + raw->cur_len = idx; > +} > + > +static void drm_dp_crc_sideband_chunk_req(u8 *msg, u8 len) > +{ > + u8 crc4; > + crc4 = drm_dp_msg_data_crc4(msg, len); > + msg[len] = crc4; > +} > + > +static void drm_dp_encode_sideband_reply(struct > drm_dp_sideband_msg_reply_body *rep, > + struct drm_dp_sideband_msg_tx *raw) > +{ > + int idx = 0; > + u8 *buf = raw->msg; > + > + buf[idx++] = (rep->reply_type & 0x1) << 7 | (rep->req_type & 0x7f); > + > + raw->cur_len = idx; > +} > + > +/* this adds a chunk of msg to the builder to get the final msg */ > +static bool drm_dp_sideband_msg_build(struct drm_dp_sideband_msg_rx *msg, > + u8 *replybuf, u8 replybuflen, bool hdr) > +{ > + int ret; > + u8 crc4; > + > + if (hdr) { > + u8 hdrlen; > + struct drm_dp_sideband_msg_hdr recv_hdr; > + ret = drm_dp_decode_sideband_msg_hdr(&recv_hdr, replybuf, > replybuflen, &hdrlen); > + if (ret == false) { > + print_hex_dump(KERN_DEBUG, "failed hdr", DUMP_PREFIX_NONE, 16, 1, > replybuf, replybuflen, false); > + return false; > + } > + > + /* get length contained in this portion */ > + msg->curchunk_len = recv_hdr.msg_len; > + msg->curchunk_hdrlen = hdrlen; > + > + /* we have already gotten an somt - don't bother parsing */ > + if (recv_hdr.somt && msg->have_somt) > + return false; > + > + if (recv_hdr.somt) { > + memcpy(&msg->initial_hdr, &recv_hdr, sizeof(struct > drm_dp_sideband_msg_hdr)); > + msg->have_somt = true; > + } > + if (recv_hdr.eomt) > + msg->have_eomt = true; > + > + /* copy the bytes for the remainder of this header chunk */ > + msg->curchunk_idx = min(msg->curchunk_len, (u8)(replybuflen - hdrlen)); > + memcpy(&msg->chunk[0], replybuf + hdrlen, msg->curchunk_idx); > + } else { > + memcpy(&msg->chunk[msg->curchunk_idx], replybuf, replybuflen); > + msg->curchunk_idx += replybuflen; > + } > + > + if (msg->curchunk_idx >= msg->curchunk_len) { > + /* do CRC */ > + crc4 = drm_dp_msg_data_crc4(msg->chunk, msg->curchunk_len - 1); > + /* copy chunk into bigger msg */ > + memcpy(&msg->msg[msg->curlen], msg->chunk, msg->curchunk_len - 1); > + msg->curlen += msg->curchunk_len - 1; > + } > + return true; > +} > + > +static bool drm_dp_sideband_parse_link_address(struct > drm_dp_sideband_msg_rx *raw, > + struct drm_dp_sideband_msg_reply_body *repmsg) > +{ > + int idx = 1; > + int i; > + memcpy(repmsg->u.link_addr.guid, &raw->msg[idx], 16); > + idx += 16; > + repmsg->u.link_addr.nports = raw->msg[idx] & 0xf; > + idx++; > + if (idx > raw->curlen) > + goto fail_len; > + for (i = 0; i < repmsg->u.link_addr.nports; i++) { > + if (raw->msg[idx] & 0x80) > + repmsg->u.link_addr.ports[i].input_port = 1; > + > + repmsg->u.link_addr.ports[i].peer_device_type = (raw->msg[idx] >> 4) > & 0x7; > + repmsg->u.link_addr.ports[i].port_number = (raw->msg[idx] & 0xf); > + > + idx++; > + if (idx > raw->curlen) > + goto fail_len; > + repmsg->u.link_addr.ports[i].mcs = (raw->msg[idx] >> 7) & 0x1; > + repmsg->u.link_addr.ports[i].ddps = (raw->msg[idx] >> 6) & 0x1; > + if (repmsg->u.link_addr.ports[i].input_port == 0) > + repmsg->u.link_addr.ports[i].legacy_device_plug_status = > (raw->msg[idx] >> 5) & 0x1; > + idx++; > + if (idx > raw->curlen) > + goto fail_len; > + if (repmsg->u.link_addr.ports[i].input_port == 0) { > + repmsg->u.link_addr.ports[i].dpcd_revision = (raw->msg[idx]); > + idx++; > + if (idx > raw->curlen) > + goto fail_len; > + memcpy(repmsg->u.link_addr.ports[i].peer_guid, &raw->msg[idx], 16); > + idx += 16; > + if (idx > raw->curlen) > + goto fail_len; > + repmsg->u.link_addr.ports[i].num_sdp_streams = (raw->msg[idx] >> 4) > & 0xf; > + repmsg->u.link_addr.ports[i].num_sdp_stream_sinks = (raw->msg[idx] & > 0xf); > + idx++; > + > + } > + if (idx > raw->curlen) > + goto fail_len; > + } > + > + return true; > +fail_len: > + DRM_DEBUG_KMS("link address reply parse length fail %d %d\n", idx, > raw->curlen); > + return false; > +} > + > +static bool drm_dp_sideband_parse_remote_dpcd_read(struct > drm_dp_sideband_msg_rx *raw, > + struct drm_dp_sideband_msg_reply_body *repmsg) > +{ > + int idx = 1; > + repmsg->u.remote_dpcd_read_ack.port_number = raw->msg[idx] & 0xf; > + idx++; > + if (idx > raw->curlen) > + goto fail_len; > + repmsg->u.remote_dpcd_read_ack.num_bytes = raw->msg[idx]; > + if (idx > raw->curlen) > + goto fail_len; > + > + memcpy(repmsg->u.remote_dpcd_read_ack.bytes, &raw->msg[idx], > repmsg->u.remote_dpcd_read_ack.num_bytes); > + return true; > +fail_len: > + DRM_DEBUG_KMS("link address reply parse length fail %d %d\n", idx, > raw->curlen); > + return false; > +} > + > +static bool drm_dp_sideband_parse_remote_dpcd_write(struct > drm_dp_sideband_msg_rx *raw, > + struct drm_dp_sideband_msg_reply_body *repmsg) > +{ > + int idx = 1; > + repmsg->u.remote_dpcd_write_ack.port_number = raw->msg[idx] & 0xf; > + idx++; > + if (idx > raw->curlen) > + goto fail_len; > + return true; > +fail_len: > + DRM_DEBUG_KMS("parse length fail %d %d\n", idx, raw->curlen); > + return false; > +} > + > +static bool drm_dp_sideband_parse_remote_i2c_read_ack(struct > drm_dp_sideband_msg_rx *raw, > + struct drm_dp_sideband_msg_reply_body *repmsg) > +{ > + int idx = 1; > + > + repmsg->u.remote_i2c_read_ack.port_number = (raw->msg[idx] & 0xf); > + idx++; > + if (idx > raw->curlen) > + goto fail_len; > + repmsg->u.remote_i2c_read_ack.num_bytes = raw->msg[idx]; > + idx++; > + /* TODO check */ > + memcpy(repmsg->u.remote_i2c_read_ack.bytes, &raw->msg[idx], > repmsg->u.remote_i2c_read_ack.num_bytes); > + return true; > +fail_len: > + DRM_DEBUG_KMS("remote i2c reply parse length fail %d %d\n", idx, > raw->curlen); > + return false; > +} > + > +static bool drm_dp_sideband_parse_enum_path_resources_ack(struct > drm_dp_sideband_msg_rx *raw, > + struct drm_dp_sideband_msg_reply_body *repmsg) > +{ > + int idx = 1; > + repmsg->u.path_resources.port_number = (raw->msg[idx] >> 4) & 0xf; > + idx++; > + if (idx > raw->curlen) > + goto fail_len; > + repmsg->u.path_resources.full_payload_bw_number = (raw->msg[idx] << > 8) | (raw->msg[idx+1]); > + idx += 2; > + if (idx > raw->curlen) > + goto fail_len; > + repmsg->u.path_resources.avail_payload_bw_number = (raw->msg[idx] << > 8) | (raw->msg[idx+1]); > + idx += 2; > + if (idx > raw->curlen) > + goto fail_len; > + return true; > +fail_len: > + DRM_DEBUG_KMS("enum resource parse length fail %d %d\n", idx, > raw->curlen); > + return false; > +} > + > +static bool drm_dp_sideband_parse_allocate_payload_ack(struct > drm_dp_sideband_msg_rx *raw, > + struct drm_dp_sideband_msg_reply_body *repmsg) > +{ > + int idx = 1; > + repmsg->u.allocate_payload.port_number = (raw->msg[idx] >> 4) & 0xf; > + idx++; > + if (idx > raw->curlen) > + goto fail_len; > + repmsg->u.allocate_payload.vcpi = raw->msg[idx]; > + idx++; > + if (idx > raw->curlen) > + goto fail_len; > + repmsg->u.allocate_payload.allocated_pbn = (raw->msg[idx] << 8) | > (raw->msg[idx+1]); > + idx += 2; > + if (idx > raw->curlen) > + goto fail_len; > + return true; > +fail_len: > + DRM_DEBUG_KMS("allocate payload parse length fail %d %d\n", idx, > raw->curlen); > + return false; > +} > + > +static bool drm_dp_sideband_parse_query_payload_ack(struct > drm_dp_sideband_msg_rx *raw, > + struct drm_dp_sideband_msg_reply_body *repmsg) > +{ > + int idx = 1; > + repmsg->u.query_payload.port_number = (raw->msg[idx] >> 4) & 0xf; > + idx++; > + if (idx > raw->curlen) > + goto fail_len; > + repmsg->u.query_payload.allocated_pbn = (raw->msg[idx] << 8) | > (raw->msg[idx + 1]); > + idx += 2; > + if (idx > raw->curlen) > + goto fail_len; > + return true; > +fail_len: > + DRM_DEBUG_KMS("query payload parse length fail %d %d\n", idx, > raw->curlen); > + return false; > +} > + > +static bool drm_dp_sideband_parse_reply(struct drm_dp_sideband_msg_rx > *raw, > + struct drm_dp_sideband_msg_reply_body *msg) > +{ > + memset(msg, 0, sizeof(*msg)); > + msg->reply_type = (raw->msg[0] & 0x80) >> 7; > + msg->req_type = (raw->msg[0] & 0x7f); > + > + if (msg->reply_type) { > + memcpy(msg->u.nak.guid, &raw->msg[1], 16); > + msg->u.nak.reason = raw->msg[17]; > + msg->u.nak.nak_data = raw->msg[18]; > + return false; > + } > + > + switch (msg->req_type) { > + case DP_LINK_ADDRESS: > + return drm_dp_sideband_parse_link_address(raw, msg); > + case DP_QUERY_PAYLOAD: > + return drm_dp_sideband_parse_query_payload_ack(raw, msg); > + case DP_REMOTE_DPCD_READ: > + return drm_dp_sideband_parse_remote_dpcd_read(raw, msg); > + case DP_REMOTE_DPCD_WRITE: > + return drm_dp_sideband_parse_remote_dpcd_write(raw, msg); > + case DP_REMOTE_I2C_READ: > + return drm_dp_sideband_parse_remote_i2c_read_ack(raw, msg); > + case DP_ENUM_PATH_RESOURCES: > + return drm_dp_sideband_parse_enum_path_resources_ack(raw, msg); > + case DP_ALLOCATE_PAYLOAD: > + return drm_dp_sideband_parse_allocate_payload_ack(raw, msg); > + default: > + DRM_ERROR("Got unknown reply 0x%02x\n", msg->req_type); > + return false; > + } > +} > + > +static bool drm_dp_sideband_parse_connection_status_notify(struct > drm_dp_sideband_msg_rx *raw, > + struct drm_dp_sideband_msg_req_body *msg) > +{ > + int idx = 1; > + > + msg->u.conn_stat.port_number = (raw->msg[idx] & 0xf0) >> 4; > + idx++; > + if (idx > raw->curlen) > + goto fail_len; > + > + memcpy(msg->u.conn_stat.guid, &raw->msg[idx], 16); > + idx += 16; > + if (idx > raw->curlen) > + goto fail_len; > + > + msg->u.conn_stat.legacy_device_plug_status = (raw->msg[idx] >> 6) & 0x1; > + msg->u.conn_stat.displayport_device_plug_status = (raw->msg[idx] >> > 5) & 0x1; > + msg->u.conn_stat.message_capability_status = (raw->msg[idx] >> 4) & 0x1; > + msg->u.conn_stat.input_port = (raw->msg[idx] >> 3) & 0x1; > + msg->u.conn_stat.peer_device_type = (raw->msg[idx] & 0x7); > + idx++; > + return true; > +fail_len: > + DRM_DEBUG_KMS("connection status reply parse length fail %d %d\n", > idx, raw->curlen); > + return false; > +} > + > +static bool drm_dp_sideband_parse_resource_status_notify(struct > drm_dp_sideband_msg_rx *raw, > + struct drm_dp_sideband_msg_req_body *msg) > +{ > + int idx = 1; > + > + msg->u.resource_stat.port_number = (raw->msg[idx] & 0xf0) >> 4; > + idx++; > + if (idx > raw->curlen) > + goto fail_len; > + > + memcpy(msg->u.resource_stat.guid, &raw->msg[idx], 16); > + idx += 16; > + if (idx > raw->curlen) > + goto fail_len; > + > + msg->u.resource_stat.available_pbn = (raw->msg[idx] << 8) | > (raw->msg[idx + 1]); > + idx++; > + return true; > +fail_len: > + DRM_DEBUG_KMS("resource status reply parse length fail %d %d\n", > idx, raw->curlen); > + return false; > +} > + > +static bool drm_dp_sideband_parse_req(struct drm_dp_sideband_msg_rx *raw, > + struct drm_dp_sideband_msg_req_body *msg) > +{ > + memset(msg, 0, sizeof(*msg)); > + msg->req_type = (raw->msg[0] & 0x7f); > + > + switch (msg->req_type) { > + case DP_CONNECTION_STATUS_NOTIFY: > + return drm_dp_sideband_parse_connection_status_notify(raw, msg); > + case DP_RESOURCE_STATUS_NOTIFY: > + return drm_dp_sideband_parse_resource_status_notify(raw, msg); > + default: > + DRM_ERROR("Got unknown request 0x%02x\n", msg->req_type); > + return false; > + } > +} > + > +static int build_dpcd_write(struct drm_dp_sideband_msg_tx *msg, u8 > port_num, u32 offset, u8 num_bytes, u8 *bytes) > +{ > + struct drm_dp_sideband_msg_req_body req; > + > + req.req_type = DP_REMOTE_DPCD_WRITE; > + req.u.dpcd_write.port_number = port_num; > + req.u.dpcd_write.dpcd_address = offset; > + req.u.dpcd_write.num_bytes = num_bytes; > + memcpy(req.u.dpcd_write.bytes, bytes, num_bytes); > + drm_dp_encode_sideband_req(&req, msg); > + > + return 0; > +} > + > +static int build_link_address(struct drm_dp_sideband_msg_tx *msg) > +{ > + struct drm_dp_sideband_msg_req_body req; > + > + req.req_type = DP_LINK_ADDRESS; > + drm_dp_encode_sideband_req(&req, msg); > + return 0; > +} > + > +static int build_enum_path_resources(struct drm_dp_sideband_msg_tx > *msg, int port_num) > +{ > + struct drm_dp_sideband_msg_req_body req; > + > + req.req_type = DP_ENUM_PATH_RESOURCES; > + req.u.port_num.port_number = port_num; > + drm_dp_encode_sideband_req(&req, msg); > > + msg->path_msg = true; > + return 0; > +} > + > +static int build_allocate_payload(struct drm_dp_sideband_msg_tx *msg, > int port_num, > + u8 vcpi, uint16_t pbn) > +{ > + struct drm_dp_sideband_msg_req_body req; > + memset(&req, 0, sizeof(req)); > + req.req_type = DP_ALLOCATE_PAYLOAD; > + req.u.allocate_payload.port_number = port_num; > + req.u.allocate_payload.vcpi = vcpi; > + req.u.allocate_payload.pbn = pbn; > + drm_dp_encode_sideband_req(&req, msg); > + msg->path_msg = true; > + return 0; > +} > + > +static int drm_dp_mst_assign_payload_id(struct > drm_dp_mst_topology_mgr *mgr, > + struct drm_dp_vcpi *vcpi) > +{ > + int ret; > + > + mutex_lock(&mgr->payload_lock); > + ret = find_first_zero_bit(&mgr->payload_mask, mgr->max_payloads + 1); > + if (ret > mgr->max_payloads) { > + ret = -EINVAL; > + DRM_DEBUG_KMS("out of payload ids %d\n", ret); > + goto out_unlock; > + } > + > + set_bit(ret, &mgr->payload_mask); > + vcpi->vcpi = ret; > + mgr->proposed_vcpis[ret - 1] = vcpi; > +out_unlock: > + mutex_unlock(&mgr->payload_lock); > + return ret; > +} > + > +static void drm_dp_mst_put_payload_id(struct drm_dp_mst_topology_mgr > *mgr, > + int id) > +{ > + if (id == 0) > + return; > + > + mutex_lock(&mgr->payload_lock); > + DRM_DEBUG_KMS("putting payload %d\n", id); > + clear_bit(id, &mgr->payload_mask); > + mgr->proposed_vcpis[id - 1] = NULL; > + mutex_unlock(&mgr->payload_lock); > +} > + > +static bool check_txmsg_state(struct drm_dp_mst_topology_mgr *mgr, > + struct drm_dp_sideband_msg_tx *txmsg) > +{ > + bool ret; > + mutex_lock(&mgr->qlock); > + ret = (txmsg->state == DRM_DP_SIDEBAND_TX_RX || > + txmsg->state == DRM_DP_SIDEBAND_TX_TIMEOUT); > + mutex_unlock(&mgr->qlock); > + return ret; > +} > + > +static int drm_dp_mst_wait_tx_reply(struct drm_dp_mst_branch *mstb, > + struct drm_dp_sideband_msg_tx *txmsg) > +{ > + struct drm_dp_mst_topology_mgr *mgr = mstb->mgr; > + int ret; > + > + ret = wait_event_timeout(mgr->tx_waitq, > + check_txmsg_state(mgr, txmsg), > + (4 * HZ)); > + mutex_lock(&mstb->mgr->qlock); > + if (ret > 0) { > + if (txmsg->state == DRM_DP_SIDEBAND_TX_TIMEOUT) { > + ret = -EIO; > + goto out; > + } > + } else { > + DRM_DEBUG_KMS("timedout msg send %p %d %d\n", txmsg, txmsg->state, > txmsg->seqno); > + > + /* dump some state */ > + ret = -EIO; > + > + /* remove from q */ > + if (txmsg->state == DRM_DP_SIDEBAND_TX_QUEUED || > + txmsg->state == DRM_DP_SIDEBAND_TX_START_SEND) { > + list_del(&txmsg->next); > + } > + > + if (txmsg->state == DRM_DP_SIDEBAND_TX_START_SEND || > + txmsg->state == DRM_DP_SIDEBAND_TX_SENT) { > + mstb->tx_slots[txmsg->seqno] = NULL; > + } > + } > +out: > + mutex_unlock(&mgr->qlock); > + > + return ret; > +} > + > +static struct drm_dp_mst_branch *drm_dp_add_mst_branch_device(u8 lct, > u8 *rad) > +{ > + struct drm_dp_mst_branch *mstb; > + > + mstb = kzalloc(sizeof(*mstb), GFP_KERNEL); > + if (!mstb) > + return NULL; > + > + mstb->lct = lct; > + if (lct > 1) > + memcpy(mstb->rad, rad, lct / 2); > + INIT_LIST_HEAD(&mstb->ports); > + kref_init(&mstb->kref); > + return mstb; > +} > + > +static void drm_dp_destroy_mst_branch_device(struct kref *kref) > +{ > + struct drm_dp_mst_branch *mstb = container_of(kref, struct > drm_dp_mst_branch, kref); > + struct drm_dp_mst_port *port, *tmp; > + bool wake_tx = false; > + > + cancel_work_sync(&mstb->mgr->work); > + > + /* > + * destroy all ports - don't need lock > + * as there are no more references to the mst branch > + * device at this point. > + */ > + list_for_each_entry_safe(port, tmp, &mstb->ports, next) { > + list_del(&port->next); > + drm_dp_put_port(port); > + } > + > + /* drop any tx slots msg */ > + mutex_lock(&mstb->mgr->qlock); > + if (mstb->tx_slots[0]) { > + mstb->tx_slots[0]->state = DRM_DP_SIDEBAND_TX_TIMEOUT; > + mstb->tx_slots[0] = NULL; > + wake_tx = true; > + } > + if (mstb->tx_slots[1]) { > + mstb->tx_slots[1]->state = DRM_DP_SIDEBAND_TX_TIMEOUT; > + mstb->tx_slots[1] = NULL; > + wake_tx = true; > + } > + mutex_unlock(&mstb->mgr->qlock); > + > + if (wake_tx) > + wake_up(&mstb->mgr->tx_waitq); > + kfree(mstb); > +} > + > +static void drm_dp_put_mst_branch_device(struct drm_dp_mst_branch *mstb) > +{ > + kref_put(&mstb->kref, drm_dp_destroy_mst_branch_device); > +} > + > + > +static void drm_dp_port_teardown_pdt(struct drm_dp_mst_port *port, > int old_pdt) > +{ > + switch (old_pdt) { > + case DP_PEER_DEVICE_DP_LEGACY_CONV: > + case DP_PEER_DEVICE_SST_SINK: > + /* remove i2c over sideband */ > + drm_dp_mst_unregister_i2c_bus(&port->aux); > + break; > + case DP_PEER_DEVICE_MST_BRANCHING: > + drm_dp_put_mst_branch_device(port->mstb); > + port->mstb = NULL; > + break; > + } > +} > + > +static void drm_dp_destroy_port(struct kref *kref) > +{ > + struct drm_dp_mst_port *port = container_of(kref, struct > drm_dp_mst_port, kref); > + struct drm_dp_mst_topology_mgr *mgr = port->mgr; > + if (!port->input) { > + port->vcpi.num_slots = 0; > + if (port->connector) > + (*port->mgr->cbs->destroy_connector)(mgr, port->connector); > + drm_dp_port_teardown_pdt(port, port->pdt); > + > + if (!port->input && port->vcpi.vcpi > 0) > + drm_dp_mst_put_payload_id(mgr, port->vcpi.vcpi); > + } > + kfree(port); > +} > + > +static void drm_dp_put_port(struct drm_dp_mst_port *port) > +{ > + kref_put(&port->kref, drm_dp_destroy_port); > +} > + > +static struct drm_dp_mst_branch > *drm_dp_mst_get_validated_mstb_ref_locked(struct drm_dp_mst_branch > *mstb, struct drm_dp_mst_branch *to_find) > +{ > + struct drm_dp_mst_port *port; > + struct drm_dp_mst_branch *rmstb; > + if (to_find == mstb) { > + kref_get(&mstb->kref); > + return mstb; > + } > + list_for_each_entry(port, &mstb->ports, next) { > + if (port->mstb) { > + rmstb = drm_dp_mst_get_validated_mstb_ref_locked(port->mstb, to_find); > + if (rmstb) > + return rmstb; > + } > + } > + return NULL; > +} > + > +static struct drm_dp_mst_branch *drm_dp_get_validated_mstb_ref(struct > drm_dp_mst_topology_mgr *mgr, struct drm_dp_mst_branch *mstb) > +{ > + struct drm_dp_mst_branch *rmstb = NULL; > + mutex_lock(&mgr->lock); > + if (mgr->mst_primary) > + rmstb = drm_dp_mst_get_validated_mstb_ref_locked(mgr->mst_primary, > mstb); > + mutex_unlock(&mgr->lock); > + return rmstb; > +} > + > +static struct drm_dp_mst_port *drm_dp_mst_get_port_ref_locked(struct > drm_dp_mst_branch *mstb, struct drm_dp_mst_port *to_find) > +{ > + struct drm_dp_mst_port *port, *mport; > + > + list_for_each_entry(port, &mstb->ports, next) { > + if (port == to_find) { > + kref_get(&port->kref); > + return port; > + } > + if (port->mstb) { > + mport = drm_dp_mst_get_port_ref_locked(port->mstb, to_find); > + if (mport) > + return mport; > + } > + } > + return NULL; > +} > + > +static struct drm_dp_mst_port *drm_dp_get_validated_port_ref(struct > drm_dp_mst_topology_mgr *mgr, struct drm_dp_mst_port *port) > +{ > + struct drm_dp_mst_port *rport = NULL; > + mutex_lock(&mgr->lock); > + if (mgr->mst_primary) > + rport = drm_dp_mst_get_port_ref_locked(mgr->mst_primary, port); > + mutex_unlock(&mgr->lock); > + return rport; > +} > + > +static struct drm_dp_mst_port *drm_dp_get_port(struct > drm_dp_mst_branch *mstb, u8 port_num) > +{ > + struct drm_dp_mst_port *port; > + > + list_for_each_entry(port, &mstb->ports, next) { > + if (port->port_num == port_num) { > + kref_get(&port->kref); > + return port; > + } > + } > + > + return NULL; > +} > + > +/* > + * calculate a new RAD for this MST branch device > + * if parent has an LCT of 2 then it has 1 nibble of RAD, > + * if parent has an LCT of 3 then it has 2 nibbles of RAD, > + */ > +static u8 drm_dp_calculate_rad(struct drm_dp_mst_port *port, > + u8 *rad) > +{ > + int lct = port->parent->lct; > + int shift = 4; > + int idx = lct / 2; > + if (lct > 1) { > + memcpy(rad, port->parent->rad, idx); > + shift = (lct % 2) ? 4 : 0; > + } else > + rad[0] = 0; > + > + rad[idx] |= port->port_num << shift; > + return lct + 1; > +} > + > +/* > + * return sends link address for new mstb > + */ > +static bool drm_dp_port_setup_pdt(struct drm_dp_mst_port *port) > +{ > + int ret; > + u8 rad[6], lct; > + bool send_link = false; > + switch (port->pdt) { > + case DP_PEER_DEVICE_DP_LEGACY_CONV: > + case DP_PEER_DEVICE_SST_SINK: > + /* add i2c over sideband */ > + ret = drm_dp_mst_register_i2c_bus(&port->aux); > + break; > + case DP_PEER_DEVICE_MST_BRANCHING: > + lct = drm_dp_calculate_rad(port, rad); > + > + port->mstb = drm_dp_add_mst_branch_device(lct, rad); > + port->mstb->mgr = port->mgr; > + port->mstb->port_parent = port; > + > + send_link = true; > + break; > + } > + return send_link; > +} > + > +static void drm_dp_check_port_guid(struct drm_dp_mst_branch *mstb, > + struct drm_dp_mst_port *port) > +{ > + int ret; > + if (port->dpcd_rev >= 0x12) { > + port->guid_valid = drm_dp_validate_guid(mstb->mgr, port->guid); > + if (!port->guid_valid) { > + ret = drm_dp_send_dpcd_write(mstb->mgr, > + port, > + DP_GUID, > + 16, port->guid); > + port->guid_valid = true; > + } > + } > +} > + > +static void build_mst_prop_path(struct drm_dp_mst_port *port, > + struct drm_dp_mst_branch *mstb, > + char *proppath) > +{ > + int i; > + char temp[8]; > + snprintf(proppath, 255, "mst:%d", mstb->mgr->conn_base_id); > + for (i = 0; i < (mstb->lct - 1); i++) { > + int shift = (i % 2) ? 0 : 4; > + int port_num = mstb->rad[i / 2] >> shift; > + snprintf(temp, 8, "-%d", port_num); > + strncat(proppath, temp, 255); > + } > + snprintf(temp, 8, "-%d", port->port_num); > + strncat(proppath, temp, 255); > +} > + > +static void drm_dp_add_port(struct drm_dp_mst_branch *mstb, > + struct device *dev, > + struct drm_dp_link_addr_reply_port *port_msg) > +{ > + struct drm_dp_mst_port *port; > + bool ret; > + bool created = false; > + int old_pdt = 0; > + int old_ddps = 0; > + port = drm_dp_get_port(mstb, port_msg->port_number); > + if (!port) { > + port = kzalloc(sizeof(*port), GFP_KERNEL); > + if (!port) > + return; > + kref_init(&port->kref); > + port->parent = mstb; > + port->port_num = port_msg->port_number; > + port->mgr = mstb->mgr; > + port->aux.name = "DPMST"; > + port->aux.dev = dev; > + created = true; > + } else { > + old_pdt = port->pdt; > + old_ddps = port->ddps; > + } > + > + port->pdt = port_msg->peer_device_type; > + port->input = port_msg->input_port; > + port->mcs = port_msg->mcs; > + port->ddps = port_msg->ddps; > + port->ldps = port_msg->legacy_device_plug_status; > + port->dpcd_rev = port_msg->dpcd_revision; > + > + memcpy(port->guid, port_msg->peer_guid, 16); > + > + /* manage mstb port lists with mgr lock - take a reference > + for this list */ > + if (created) { > + mutex_lock(&mstb->mgr->lock); > + kref_get(&port->kref); > + list_add(&port->next, &mstb->ports); > + mutex_unlock(&mstb->mgr->lock); > + } > + > + if (old_ddps != port->ddps) { > + if (port->ddps) { > + drm_dp_check_port_guid(mstb, port); > + if (!port->input) > + drm_dp_send_enum_path_resources(mstb->mgr, mstb, port); > + } else { > + port->guid_valid = false; > + port->available_pbn = 0; > + } > + } > + > + if (old_pdt != port->pdt && !port->input) { > + drm_dp_port_teardown_pdt(port, old_pdt); > + > + ret = drm_dp_port_setup_pdt(port); > + if (ret == true) { > + drm_dp_send_link_address(mstb->mgr, port->mstb); > + port->mstb->link_address_sent = true; > + } > + } > + > + if (created && !port->input) { > + char proppath[255]; > + build_mst_prop_path(port, mstb, proppath); > + port->connector = (*mstb->mgr->cbs->add_connector)(mstb->mgr, port, > proppath); > + } > + > + /* put reference to this port */ > + drm_dp_put_port(port); > +} > + > +static void drm_dp_update_port(struct drm_dp_mst_branch *mstb, > + struct drm_dp_connection_status_notify *conn_stat) > +{ > + struct drm_dp_mst_port *port; > + int old_pdt; > + int old_ddps; > + bool dowork = false; > + port = drm_dp_get_port(mstb, conn_stat->port_number); > + if (!port) > + return; > + > + old_ddps = port->ddps; > + old_pdt = port->pdt; > + port->pdt = conn_stat->peer_device_type; > + port->mcs = conn_stat->message_capability_status; > + port->ldps = conn_stat->legacy_device_plug_status; > + port->ddps = conn_stat->displayport_device_plug_status; > + > + if (old_ddps != port->ddps) { > + if (port->ddps) { > + drm_dp_check_port_guid(mstb, port); > + dowork = true; > + } else { > + port->guid_valid = false; > + port->available_pbn = 0; > + } > + } > + if (old_pdt != port->pdt && !port->input) { > + drm_dp_port_teardown_pdt(port, old_pdt); > + > + if (drm_dp_port_setup_pdt(port)) > + dowork = true; > + } > + > + drm_dp_put_port(port); > + if (dowork) > + queue_work(system_long_wq, &mstb->mgr->work); > + > +} > + > +static struct drm_dp_mst_branch *drm_dp_get_mst_branch_device(struct > drm_dp_mst_topology_mgr *mgr, > + u8 lct, u8 *rad) > +{ > + struct drm_dp_mst_branch *mstb; > + struct drm_dp_mst_port *port; > + int i; > + /* find the port by iterating down */ > + mstb = mgr->mst_primary; > + > + for (i = 0; i < lct - 1; i++) { > + int shift = (i % 2) ? 0 : 4; > + int port_num = rad[i / 2] >> shift; > + > + list_for_each_entry(port, &mstb->ports, next) { > + if (port->port_num == port_num) { > + if (!port->mstb) { > + DRM_ERROR("failed to lookup MSTB with lct %d, rad %02x\n", lct, rad[0]); > + return NULL; > + } > + > + mstb = port->mstb; > + break; > + } > + } > + } > + kref_get(&mstb->kref); > + return mstb; > +} > + > +static void drm_dp_check_and_send_link_address(struct > drm_dp_mst_topology_mgr *mgr, > + struct drm_dp_mst_branch *mstb) > +{ > + struct drm_dp_mst_port *port; > + > + if (!mstb->link_address_sent) { > + drm_dp_send_link_address(mgr, mstb); > + mstb->link_address_sent = true; > + } > + list_for_each_entry(port, &mstb->ports, next) { > + if (port->input) > + continue; > + > + if (!port->ddps) > + continue; > + > + if (!port->available_pbn) > + drm_dp_send_enum_path_resources(mgr, mstb, port); > + > + if (port->mstb) > + drm_dp_check_and_send_link_address(mgr, port->mstb); > + } > +} > + > +static void drm_dp_mst_link_probe_work(struct work_struct *work) > +{ > + struct drm_dp_mst_topology_mgr *mgr = container_of(work, struct > drm_dp_mst_topology_mgr, work); > + > + drm_dp_check_and_send_link_address(mgr, mgr->mst_primary); > + > +} > + > +static bool drm_dp_validate_guid(struct drm_dp_mst_topology_mgr *mgr, > + u8 *guid) > +{ > + static u8 zero_guid[16]; > + > + if (!memcmp(guid, zero_guid, 16)) { > + u64 salt = get_jiffies_64(); > + memcpy(&guid[0], &salt, sizeof(u64)); > + memcpy(&guid[8], &salt, sizeof(u64)); > + return false; > + } > + return true; > +} > + > +#if 0 > +static int build_dpcd_read(struct drm_dp_sideband_msg_tx *msg, u8 > port_num, u32 offset, u8 num_bytes) > +{ > + struct drm_dp_sideband_msg_req_body req; > + > + req.req_type = DP_REMOTE_DPCD_READ; > + req.u.dpcd_read.port_number = port_num; > + req.u.dpcd_read.dpcd_address = offset; > + req.u.dpcd_read.num_bytes = num_bytes; > + drm_dp_encode_sideband_req(&req, msg); > + > + return 0; > +} > +#endif > + > +static int drm_dp_send_sideband_msg(struct drm_dp_mst_topology_mgr *mgr, > + bool up, u8 *msg, int len) > +{ > + int ret; > + int regbase = up ? DP_SIDEBAND_MSG_UP_REP_BASE : > DP_SIDEBAND_MSG_DOWN_REQ_BASE; > + int tosend, total, offset; > + int retries = 0; > + > +retry: > + total = len; > + offset = 0; > + do { > + tosend = min3(mgr->max_dpcd_transaction_bytes, 16, total); > + > + mutex_lock(&mgr->aux_lock); > + ret = drm_dp_dpcd_write(mgr->aux, regbase + offset, > + &msg[offset], > + tosend); > + mutex_unlock(&mgr->aux_lock); > + if (ret != tosend) { > + if (ret == -EIO && retries < 5) { > + retries++; > + goto retry; > + } > + DRM_DEBUG_KMS("failed to dpcd write %d %d\n", tosend, ret); > + WARN(1, "fail\n"); > + > + return -EIO; > + } > + offset += tosend; > + total -= tosend; > + } while (total > 0); > + return 0; > +} > + > +static int set_hdr_from_dst_qlock(struct drm_dp_sideband_msg_hdr *hdr, > + struct drm_dp_sideband_msg_tx *txmsg) > +{ > + struct drm_dp_mst_branch *mstb = txmsg->dst; > + > + /* both msg slots are full */ > + if (txmsg->seqno == -1) { > + if (mstb->tx_slots[0] && mstb->tx_slots[1]) { > + DRM_DEBUG_KMS("%s: failed to find slot\n", __func__); > + return -EAGAIN; > + } > + if (mstb->tx_slots[0] == NULL && mstb->tx_slots[1] == NULL) { > + txmsg->seqno = mstb->last_seqno; > + mstb->last_seqno ^= 1; > + } else if (mstb->tx_slots[0] == NULL) > + txmsg->seqno = 0; > + else > + txmsg->seqno = 1; > + mstb->tx_slots[txmsg->seqno] = txmsg; > + } > + hdr->broadcast = 0; > + hdr->path_msg = txmsg->path_msg; > + hdr->lct = mstb->lct; > + hdr->lcr = mstb->lct - 1; > + if (mstb->lct > 1) > + memcpy(hdr->rad, mstb->rad, mstb->lct / 2); > + hdr->seqno = txmsg->seqno; > + return 0; > +} > +/* > + * process a single block of the next message in the sideband queue > + */ > +static int process_single_tx_qlock(struct drm_dp_mst_topology_mgr *mgr, > + struct drm_dp_sideband_msg_tx *txmsg, > + bool up) > +{ > + u8 chunk[48]; > + struct drm_dp_sideband_msg_hdr hdr; > + int len, space, idx, tosend; > + int ret; > + > + if (txmsg->state == DRM_DP_SIDEBAND_TX_QUEUED) { > + txmsg->seqno = -1; > + txmsg->state = DRM_DP_SIDEBAND_TX_START_SEND; > + } > + > + /* make hdr from dst mst - for replies use seqno > + otherwise assign one */ > + ret = set_hdr_from_dst_qlock(&hdr, txmsg); > + if (ret < 0) > + return ret; > + > + /* amount left to send in this message */ > + len = txmsg->cur_len - txmsg->cur_offset; > + > + /* 48 - sideband msg size - 1 byte for data CRC, x header bytes */ > + space = 48 - 1 - drm_dp_calc_sb_hdr_size(&hdr); > + > + tosend = min(len, space); > + if (len == txmsg->cur_len) > + hdr.somt = 1; > + if (space >= len) > + hdr.eomt = 1; > + > + > + hdr.msg_len = tosend + 1; > + drm_dp_encode_sideband_msg_hdr(&hdr, chunk, &idx); > + memcpy(&chunk[idx], &txmsg->msg[txmsg->cur_offset], tosend); > + /* add crc at end */ > + drm_dp_crc_sideband_chunk_req(&chunk[idx], tosend); > + idx += tosend + 1; > + > + ret = drm_dp_send_sideband_msg(mgr, up, chunk, idx); > + if (ret) { > + DRM_DEBUG_KMS("sideband msg failed to send\n"); > + return ret; > + } > + > + txmsg->cur_offset += tosend; > + if (txmsg->cur_offset == txmsg->cur_len) { > + txmsg->state = DRM_DP_SIDEBAND_TX_SENT; > + return 1; > + } > + return 0; > +} > + > +/* must be called holding qlock */ > +static void process_single_down_tx_qlock(struct > drm_dp_mst_topology_mgr *mgr) > +{ > + struct drm_dp_sideband_msg_tx *txmsg; > + int ret; > + > + /* construct a chunk from the first msg in the tx_msg queue */ > + if (list_empty(&mgr->tx_msg_downq)) { > + mgr->tx_down_in_progress = false; > + return; > + } > + mgr->tx_down_in_progress = true; > + > + txmsg = list_first_entry(&mgr->tx_msg_downq, struct > drm_dp_sideband_msg_tx, next); > + ret = process_single_tx_qlock(mgr, txmsg, false); > + if (ret == 1) { > + /* txmsg is sent it should be in the slots now */ > + list_del(&txmsg->next); > + } else if (ret) { > + DRM_DEBUG_KMS("failed to send msg in q %d\n", ret); > + list_del(&txmsg->next); > + if (txmsg->seqno != -1) > + txmsg->dst->tx_slots[txmsg->seqno] = NULL; > + txmsg->state = DRM_DP_SIDEBAND_TX_TIMEOUT; > + wake_up(&mgr->tx_waitq); > + } > + if (list_empty(&mgr->tx_msg_downq)) { > + mgr->tx_down_in_progress = false; > + return; > + } > +} > + > +/* called holding qlock */ > +static void process_single_up_tx_qlock(struct drm_dp_mst_topology_mgr > *mgr) > +{ > + struct drm_dp_sideband_msg_tx *txmsg; > + int ret; > + > + /* construct a chunk from the first msg in the tx_msg queue */ > + if (list_empty(&mgr->tx_msg_upq)) { > + mgr->tx_up_in_progress = false; > + return; > + } > + > + txmsg = list_first_entry(&mgr->tx_msg_upq, struct > drm_dp_sideband_msg_tx, next); > + ret = process_single_tx_qlock(mgr, txmsg, true); > + if (ret == 1) { > + /* up txmsgs aren't put in slots - so free after we send it */ > + list_del(&txmsg->next); > + kfree(txmsg); > + } else if (ret) > + DRM_DEBUG_KMS("failed to send msg in q %d\n", ret); > + mgr->tx_up_in_progress = true; > +} > + > +static void drm_dp_queue_down_tx(struct drm_dp_mst_topology_mgr *mgr, > + struct drm_dp_sideband_msg_tx *txmsg) > +{ > + mutex_lock(&mgr->qlock); > + list_add_tail(&txmsg->next, &mgr->tx_msg_downq); > + if (!mgr->tx_down_in_progress) > + process_single_down_tx_qlock(mgr); > + mutex_unlock(&mgr->qlock); > +} > + > +static int drm_dp_send_link_address(struct drm_dp_mst_topology_mgr *mgr, > + struct drm_dp_mst_branch *mstb) > +{ > + int len; > + struct drm_dp_sideband_msg_tx *txmsg; > + int ret; > + > + txmsg = kzalloc(sizeof(*txmsg), GFP_KERNEL); > + if (!txmsg) > + return -ENOMEM; > + > + txmsg->dst = mstb; > + len = build_link_address(txmsg); > + > + drm_dp_queue_down_tx(mgr, txmsg); > + > + ret = drm_dp_mst_wait_tx_reply(mstb, txmsg); > + if (ret > 0) { > + int i; > + > + if (txmsg->reply.reply_type == 1) > + DRM_DEBUG_KMS("link address nak received\n"); > + else { > + DRM_DEBUG_KMS("link address reply: %d\n", > txmsg->reply.u.link_addr.nports); > + for (i = 0; i < txmsg->reply.u.link_addr.nports; i++) { > + DRM_DEBUG_KMS("port %d: input %d, pdt: %d, pn: %d, dpcd_rev: %02x, > mcs: %d, ddps: %d, ldps %d\n", i, > + txmsg->reply.u.link_addr.ports[i].input_port, > + txmsg->reply.u.link_addr.ports[i].peer_device_type, > + txmsg->reply.u.link_addr.ports[i].port_number, > + txmsg->reply.u.link_addr.ports[i].dpcd_revision, > + txmsg->reply.u.link_addr.ports[i].mcs, > + txmsg->reply.u.link_addr.ports[i].ddps, > + txmsg->reply.u.link_addr.ports[i].legacy_device_plug_status); > + } > + for (i = 0; i < txmsg->reply.u.link_addr.nports; i++) { > + drm_dp_add_port(mstb, mgr->dev, &txmsg->reply.u.link_addr.ports[i]); > + } > + (*mgr->cbs->hotplug)(mgr); > + } > + } else > + DRM_DEBUG_KMS("link address failed %d\n", ret); > + > + kfree(txmsg); > + return 0; > +} > + > +static int drm_dp_send_enum_path_resources(struct > drm_dp_mst_topology_mgr *mgr, > + struct drm_dp_mst_branch *mstb, > + struct drm_dp_mst_port *port) > +{ > + int len; > + struct drm_dp_sideband_msg_tx *txmsg; > + int ret; > + > + txmsg = kzalloc(sizeof(*txmsg), GFP_KERNEL); > + if (!txmsg) > + return -ENOMEM; > + > + txmsg->dst = mstb; > + len = build_enum_path_resources(txmsg, port->port_num); > + > + drm_dp_queue_down_tx(mgr, txmsg); > + > + ret = drm_dp_mst_wait_tx_reply(mstb, txmsg); > + if (ret > 0) { > + if (txmsg->reply.reply_type == 1) > + DRM_DEBUG_KMS("enum path resources nak received\n"); > + else { > + if (port->port_num != txmsg->reply.u.path_resources.port_number) > + DRM_ERROR("got incorrect port in response\n"); > + DRM_DEBUG_KMS("enum path resources %d: %d %d\n", > txmsg->reply.u.path_resources.port_number, > txmsg->reply.u.path_resources.full_payload_bw_number, > + txmsg->reply.u.path_resources.avail_payload_bw_number); > + port->available_pbn = > txmsg->reply.u.path_resources.avail_payload_bw_number; > + } > + } > + > + kfree(txmsg); > + return 0; > +} > + > +int drm_dp_payload_send_msg(struct drm_dp_mst_topology_mgr *mgr, > + struct drm_dp_mst_port *port, > + int id, > + int pbn) > +{ > + struct drm_dp_sideband_msg_tx *txmsg; > + struct drm_dp_mst_branch *mstb; > + int len, ret; > + > + mstb = drm_dp_get_validated_mstb_ref(mgr, port->parent); > + if (!mstb) > + return -EINVAL; > + > + txmsg = kzalloc(sizeof(*txmsg), GFP_KERNEL); > + if (!txmsg) { > + ret = -ENOMEM; > + goto fail_put; > + } > + > + txmsg->dst = mstb; > + len = build_allocate_payload(txmsg, port->port_num, > + id, > + pbn); > + > + drm_dp_queue_down_tx(mgr, txmsg); > + > + ret = drm_dp_mst_wait_tx_reply(mstb, txmsg); > + if (ret > 0) { > + if (txmsg->reply.reply_type == 1) { > + ret = -EINVAL; > + } else > + ret = 0; > + } > + kfree(txmsg); > +fail_put: > + drm_dp_put_mst_branch_device(mstb); > + return ret; > +} > + > +static int drm_dp_create_payload_step1(struct drm_dp_mst_topology_mgr > *mgr, > + int id, > + struct drm_dp_payload *payload) > +{ > + int ret; > + > + ret = drm_dp_dpcd_write_payload(mgr, id, payload); > + if (ret < 0) { > + payload->payload_state = 0; > + return ret; > + } > + payload->payload_state = DP_PAYLOAD_LOCAL; > + return 0; > +} > + > +int drm_dp_create_payload_step2(struct drm_dp_mst_topology_mgr *mgr, > + struct drm_dp_mst_port *port, > + int id, > + struct drm_dp_payload *payload) > +{ > + int ret; > + ret = drm_dp_payload_send_msg(mgr, port, id, port->vcpi.pbn); > + if (ret < 0) > + return ret; > + payload->payload_state = DP_PAYLOAD_REMOTE; > + return ret; > +} > + > +int drm_dp_destroy_payload_step1(struct drm_dp_mst_topology_mgr *mgr, > + struct drm_dp_mst_port *port, > + int id, > + struct drm_dp_payload *payload) > +{ > + DRM_DEBUG_KMS("\n"); > + /* its okay for these to fail */ > + if (port) { > + drm_dp_payload_send_msg(mgr, port, id, 0); > + } > + > + drm_dp_dpcd_write_payload(mgr, id, payload); > + payload->payload_state = 0; > + return 0; > +} > + > +int drm_dp_destroy_payload_step2(struct drm_dp_mst_topology_mgr *mgr, > + int id, > + struct drm_dp_payload *payload) > +{ > + payload->payload_state = 0; > + return 0; > +} > + > +/** > + * drm_dp_update_payload_part1() - Execute payload update part 1 > + * @mgr: manager to use. > + * > + * This iterates over all proposed virtual channels, and tries to > + * allocate space in the link for them. For 0->slots transitions, > + * this step just writes the VCPI to the MST device. For slots->0 > + * transitions, this writes the updated VCPIs and removes the > + * remote VC payloads. > + * > + * after calling this the driver should generate ACT and payload > + * packets. > + */ > +int drm_dp_update_payload_part1(struct drm_dp_mst_topology_mgr *mgr) > +{ > + int i; > + int cur_slots = 1; > + struct drm_dp_payload req_payload; > + struct drm_dp_mst_port *port; > + > + mutex_lock(&mgr->payload_lock); > + for (i = 0; i < mgr->max_payloads; i++) { > + /* solve the current payloads - compare to the hw ones > + - update the hw view */ > + req_payload.start_slot = cur_slots; > + if (mgr->proposed_vcpis[i]) { > + port = container_of(mgr->proposed_vcpis[i], struct drm_dp_mst_port, > vcpi); > + req_payload.num_slots = mgr->proposed_vcpis[i]->num_slots; > + } else { > + port = NULL; > + req_payload.num_slots = 0; > + } > + /* work out what is required to happen with this payload */ > + if (mgr->payloads[i].start_slot != req_payload.start_slot || > + mgr->payloads[i].num_slots != req_payload.num_slots) { > + > + /* need to push an update for this payload */ > + if (req_payload.num_slots) { > + drm_dp_create_payload_step1(mgr, i + 1, &req_payload); > + mgr->payloads[i].num_slots = req_payload.num_slots; > + } else if (mgr->payloads[i].num_slots) { > + mgr->payloads[i].num_slots = 0; > + drm_dp_destroy_payload_step1(mgr, port, i + 1, &mgr->payloads[i]); > + req_payload.payload_state = mgr->payloads[i].payload_state; > + } > + mgr->payloads[i].start_slot = req_payload.start_slot; > + mgr->payloads[i].payload_state = req_payload.payload_state; > + } > + cur_slots += req_payload.num_slots; > + } > + mutex_unlock(&mgr->payload_lock); > + > + return 0; > +} > +EXPORT_SYMBOL(drm_dp_update_payload_part1); > + > +/** > + * drm_dp_update_payload_part2() - Execute payload update part 2 > + * @mgr: manager to use. > + * > + * This iterates over all proposed virtual channels, and tries to > + * allocate space in the link for them. For 0->slots transitions, > + * this step writes the remote VC payload commands. For slots->0 > + * this just resets some internal state. > + */ > +int drm_dp_update_payload_part2(struct drm_dp_mst_topology_mgr *mgr) > +{ > + struct drm_dp_mst_port *port; > + int i; > + int ret; > + mutex_lock(&mgr->payload_lock); > + for (i = 0; i < mgr->max_payloads; i++) { > + > + if (!mgr->proposed_vcpis[i]) > + continue; > + > + port = container_of(mgr->proposed_vcpis[i], struct drm_dp_mst_port, > vcpi); > + > + DRM_DEBUG_KMS("payload %d %d\n", i, mgr->payloads[i].payload_state); > + if (mgr->payloads[i].payload_state == DP_PAYLOAD_LOCAL) { > + ret = drm_dp_create_payload_step2(mgr, port, i + 1, &mgr->payloads[i]); > + } else if (mgr->payloads[i].payload_state == DP_PAYLOAD_DELETE_LOCAL) { > + ret = drm_dp_destroy_payload_step2(mgr, i + 1, &mgr->payloads[i]); > + } > + if (ret) { > + mutex_unlock(&mgr->payload_lock); > + return ret; > + } > + } > + mutex_unlock(&mgr->payload_lock); > + return 0; > +} > +EXPORT_SYMBOL(drm_dp_update_payload_part2); > + > +#if 0 /* unused as of yet */ > +static int drm_dp_send_dpcd_read(struct drm_dp_mst_topology_mgr *mgr, > + struct drm_dp_mst_port *port, > + int offset, int size) > +{ > + int len; > + struct drm_dp_sideband_msg_tx *txmsg; > + > + txmsg = kzalloc(sizeof(*txmsg), GFP_KERNEL); > + if (!txmsg) > + return -ENOMEM; > + > + len = build_dpcd_read(txmsg, port->port_num, 0, 8); > + txmsg->dst = port->parent; > + > + drm_dp_queue_down_tx(mgr, txmsg); > + > + return 0; > +} > +#endif > + > +static int drm_dp_send_dpcd_write(struct drm_dp_mst_topology_mgr *mgr, > + struct drm_dp_mst_port *port, > + int offset, int size, u8 *bytes) > +{ > + int len; > + int ret; > + struct drm_dp_sideband_msg_tx *txmsg; > + struct drm_dp_mst_branch *mstb; > + > + mstb = drm_dp_get_validated_mstb_ref(mgr, port->parent); > + if (!mstb) > + return -EINVAL; > + > + txmsg = kzalloc(sizeof(*txmsg), GFP_KERNEL); > + if (!txmsg) { > + ret = -ENOMEM; > + goto fail_put; > + } > + > + len = build_dpcd_write(txmsg, port->port_num, offset, size, bytes); > + txmsg->dst = mstb; > + > + drm_dp_queue_down_tx(mgr, txmsg); > + > + ret = drm_dp_mst_wait_tx_reply(mstb, txmsg); > + if (ret > 0) { > + if (txmsg->reply.reply_type == 1) { > + ret = -EINVAL; > + } else > + ret = 0; > + } > + kfree(txmsg); > +fail_put: > + drm_dp_put_mst_branch_device(mstb); > + return ret; > +} > + > +static int drm_dp_encode_up_ack_reply(struct drm_dp_sideband_msg_tx > *msg, u8 req_type) > +{ > + struct drm_dp_sideband_msg_reply_body reply; > + > + reply.reply_type = 1; > + reply.req_type = req_type; > + drm_dp_encode_sideband_reply(&reply, msg); > + return 0; > +} > + > +static int drm_dp_send_up_ack_reply(struct drm_dp_mst_topology_mgr *mgr, > + struct drm_dp_mst_branch *mstb, > + int req_type, int seqno, bool broadcast) > +{ > + struct drm_dp_sideband_msg_tx *txmsg; > + > + txmsg = kzalloc(sizeof(*txmsg), GFP_KERNEL); > + if (!txmsg) > + return -ENOMEM; > + > + txmsg->dst = mstb; > + txmsg->seqno = seqno; > + drm_dp_encode_up_ack_reply(txmsg, req_type); > + > + mutex_lock(&mgr->qlock); > + list_add_tail(&txmsg->next, &mgr->tx_msg_upq); > + if (!mgr->tx_up_in_progress) { > + process_single_up_tx_qlock(mgr); > + } > + mutex_unlock(&mgr->qlock); > + return 0; > +} > + > +static int drm_dp_get_vc_payload_bw(int dp_link_bw, int dp_link_count) > +{ > + switch (dp_link_bw) { > + case DP_LINK_BW_1_62: > + return 3 * dp_link_count; > + case DP_LINK_BW_2_7: > + return 5 * dp_link_count; > + case DP_LINK_BW_5_4: > + return 10 * dp_link_count; > + } > + return 0; > +} > + > +/** > + * drm_dp_mst_topology_mgr_set_mst() - Set the MST state for a > topology manager > + * @mgr: manager to set state for > + * @mst_state: true to enable MST on this connector - false to disable. > + * > + * This is called by the driver when it detects an MST capable device > plugged > + * into a DP MST capable port, or when a DP MST capable device is > unplugged. > + */ > +int drm_dp_mst_topology_mgr_set_mst(struct drm_dp_mst_topology_mgr > *mgr, bool mst_state) > +{ > + int ret = 0; > + struct drm_dp_mst_branch *mstb = NULL; > + > + mutex_lock(&mgr->lock); > + if (mst_state == mgr->mst_state) > + goto out_unlock; > + > + mgr->mst_state = mst_state; > + /* set the device into MST mode */ > + if (mst_state) { > + WARN_ON(mgr->mst_primary); > + > + /* get dpcd info */ > + mutex_lock(&mgr->aux_lock); > + ret = drm_dp_dpcd_read(mgr->aux, DP_DPCD_REV, mgr->dpcd, > DP_RECEIVER_CAP_SIZE); > + mutex_unlock(&mgr->aux_lock); > + if (ret != DP_RECEIVER_CAP_SIZE) { > + DRM_DEBUG_KMS("failed to read DPCD\n"); > + goto out_unlock; > + } > + > + mgr->pbn_div = drm_dp_get_vc_payload_bw(mgr->dpcd[1], mgr->dpcd[2] & > DP_MAX_LANE_COUNT_MASK); > + mgr->total_pbn = 2560; > + mgr->total_slots = DIV_ROUND_UP(mgr->total_pbn, mgr->pbn_div); > + mgr->avail_slots = mgr->total_slots; > + > + /* add initial branch device at LCT 1 */ > + mstb = drm_dp_add_mst_branch_device(1, NULL); > + if (mstb == NULL) { > + ret = -ENOMEM; > + goto out_unlock; > + } > + mstb->mgr = mgr; > + > + /* give this the main reference */ > + mgr->mst_primary = mstb; > + kref_get(&mgr->mst_primary->kref); > + > + { > + struct drm_dp_payload reset_pay; > + reset_pay.start_slot = 0; > + reset_pay.num_slots = 0x3f; > + drm_dp_dpcd_write_payload(mgr, 0, &reset_pay); > + } > + > + mutex_lock(&mgr->aux_lock); > + ret = drm_dp_dpcd_writeb(mgr->aux, DP_MSTM_CTRL, > + DP_MST_EN | DP_UP_REQ_EN | DP_UPSTREAM_IS_SRC); > + mutex_unlock(&mgr->aux_lock); > + if (ret < 0) { > + goto out_unlock; > + } > + > + > + /* sort out guid */ > + mutex_lock(&mgr->aux_lock); > + ret = drm_dp_dpcd_read(mgr->aux, DP_GUID, mgr->guid, 16); > + mutex_unlock(&mgr->aux_lock); > + if (ret != 16) { > + DRM_DEBUG_KMS("failed to read DP GUID %d\n", ret); > + goto out_unlock; > + } > + > + mgr->guid_valid = drm_dp_validate_guid(mgr, mgr->guid); > + if (!mgr->guid_valid) { > + ret = drm_dp_dpcd_write(mgr->aux, DP_GUID, mgr->guid, 16); > + mgr->guid_valid = true; > + } > + > + queue_work(system_long_wq, &mgr->work); > + > + ret = 0; > + } else { > + /* disable MST on the device */ > + mstb = mgr->mst_primary; > + mgr->mst_primary = NULL; > + /* this can fail if the device is gone */ > + drm_dp_dpcd_writeb(mgr->aux, DP_MSTM_CTRL, 0); > + ret = 0; > + memset(mgr->payloads, 0, mgr->max_payloads * sizeof(struct > drm_dp_payload)); > + mgr->payload_mask = 0; > + set_bit(0, &mgr->payload_mask); > + } > + > +out_unlock: > + mutex_unlock(&mgr->lock); > + if (mstb) > + drm_dp_put_mst_branch_device(mstb); > + return ret; > + > +} > +EXPORT_SYMBOL(drm_dp_mst_topology_mgr_set_mst); > + > +/** > + * drm_dp_mst_topology_mgr_suspend() - suspend the MST manager > + * @mgr: manager to suspend > + * > + * This function tells the MST device that we can't handle UP messages > + * anymore. This should stop it from sending any since we are suspended. > + */ > +void drm_dp_mst_topology_mgr_suspend(struct drm_dp_mst_topology_mgr *mgr) > +{ > + mutex_lock(&mgr->lock); > + mutex_lock(&mgr->aux_lock); > + drm_dp_dpcd_writeb(mgr->aux, DP_MSTM_CTRL, > + DP_MST_EN | DP_UPSTREAM_IS_SRC); > + mutex_unlock(&mgr->aux_lock); > + mutex_unlock(&mgr->lock); > +} > +EXPORT_SYMBOL(drm_dp_mst_topology_mgr_suspend); > + > +/** > + * drm_dp_mst_topology_mgr_resume() - resume the MST manager > + * @mgr: manager to resume > + * > + * This will fetch DPCD and see if the device is still there, > + * if it is, it will rewrite the MSTM control bits, and return. > + * > + * if the device fails this returns -1, and the driver should do > + * a full MST reprobe, in case we were undocked. > + */ > +int drm_dp_mst_topology_mgr_resume(struct drm_dp_mst_topology_mgr *mgr) > +{ > + int ret = 0; > + > + mutex_lock(&mgr->lock); > + > + if (mgr->mst_primary) { > + int sret; > + mutex_lock(&mgr->aux_lock); > + sret = drm_dp_dpcd_read(mgr->aux, DP_DPCD_REV, mgr->dpcd, > DP_RECEIVER_CAP_SIZE); > + mutex_unlock(&mgr->aux_lock); > + if (sret != DP_RECEIVER_CAP_SIZE) { > + DRM_DEBUG_KMS("dpcd read failed - undocked during suspend?\n"); > + ret = -1; > + goto out_unlock; > + } > + > + mutex_lock(&mgr->aux_lock); > + ret = drm_dp_dpcd_writeb(mgr->aux, DP_MSTM_CTRL, > + DP_MST_EN | DP_UP_REQ_EN | DP_UPSTREAM_IS_SRC); > + mutex_unlock(&mgr->aux_lock); > + if (ret < 0) { > + DRM_DEBUG_KMS("mst write failed - undocked during suspend?\n"); > + ret = -1; > + goto out_unlock; > + } > + ret = 0; > + } else > + ret = -1; > + > +out_unlock: > + mutex_unlock(&mgr->lock); > + return ret; > +} > +EXPORT_SYMBOL(drm_dp_mst_topology_mgr_resume); > + > +static void drm_dp_get_one_sb_msg(struct drm_dp_mst_topology_mgr > *mgr, bool up) > +{ > + int len; > + u8 replyblock[32]; > + int replylen, origlen, curreply; > + int ret; > + struct drm_dp_sideband_msg_rx *msg; > + int basereg = up ? DP_SIDEBAND_MSG_UP_REQ_BASE : > DP_SIDEBAND_MSG_DOWN_REP_BASE; > + msg = up ? &mgr->up_req_recv : &mgr->down_rep_recv; > + > + len = min(mgr->max_dpcd_transaction_bytes, 16); > + mutex_lock(&mgr->aux_lock); > + ret = drm_dp_dpcd_read(mgr->aux, basereg, > + replyblock, len); > + mutex_unlock(&mgr->aux_lock); > + if (ret != len) { > + DRM_DEBUG_KMS("failed to read DPCD down rep %d %d\n", len, ret); > + return; > + } > + ret = drm_dp_sideband_msg_build(msg, replyblock, len, true); > + if (!ret) { > + DRM_DEBUG_KMS("sideband msg build failed %d\n", replyblock[0]); > + return; > + } > + replylen = msg->curchunk_len + msg->curchunk_hdrlen; > + > + origlen = replylen; > + replylen -= len; > + curreply = len; > + while (replylen > 0) { > + len = min3(replylen, mgr->max_dpcd_transaction_bytes, 16); > + mutex_lock(&mgr->aux_lock); > + ret = drm_dp_dpcd_read(mgr->aux, basereg + curreply, > + replyblock, len); > + mutex_unlock(&mgr->aux_lock); > + if (ret != len) { > + DRM_DEBUG_KMS("failed to read a chunk\n"); > + } > + ret = drm_dp_sideband_msg_build(msg, replyblock, len, false); > + if (ret == false) > + DRM_DEBUG_KMS("failed to build sideband msg\n"); > + curreply += len; > + replylen -= len; > + } > +} > + > +static int drm_dp_mst_handle_down_rep(struct drm_dp_mst_topology_mgr > *mgr) > +{ > + int ret = 0; > + > + drm_dp_get_one_sb_msg(mgr, false); > + > + if (mgr->down_rep_recv.have_eomt) { > + struct drm_dp_sideband_msg_tx *txmsg; > + struct drm_dp_mst_branch *mstb; > + int slot = -1; > + mstb = drm_dp_get_mst_branch_device(mgr, > + mgr->down_rep_recv.initial_hdr.lct, > + mgr->down_rep_recv.initial_hdr.rad); > + > + if (!mstb) { > + DRM_DEBUG_KMS("Got MST reply from unknown device %d\n", > mgr->down_rep_recv.initial_hdr.lct); > + memset(&mgr->down_rep_recv, 0, sizeof(struct drm_dp_sideband_msg_rx)); > + return 0; > + } > + > + /* find the message */ > + slot = mgr->down_rep_recv.initial_hdr.seqno; > + mutex_lock(&mgr->qlock); > + txmsg = mstb->tx_slots[slot]; > + /* remove from slots */ > + mutex_unlock(&mgr->qlock); > + > + if (!txmsg) { > + DRM_DEBUG_KMS("Got MST reply with no msg %p %d %d %02x %02x\n", > + mstb, > + mgr->down_rep_recv.initial_hdr.seqno, > + mgr->down_rep_recv.initial_hdr.lct, > + mgr->down_rep_recv.initial_hdr.rad[0], > + mgr->down_rep_recv.msg[0]); > + drm_dp_put_mst_branch_device(mstb); > + memset(&mgr->down_rep_recv, 0, sizeof(struct drm_dp_sideband_msg_rx)); > + return 0; > + } > + > + drm_dp_sideband_parse_reply(&mgr->down_rep_recv, &txmsg->reply); > + if (txmsg->reply.reply_type == 1) { > + DRM_DEBUG_KMS("Got NAK reply: req 0x%02x, reason 0x%02x, nak data > 0x%02x\n", txmsg->reply.req_type, txmsg->reply.u.nak.reason, > txmsg->reply.u.nak.nak_data); > + } > + > + memset(&mgr->down_rep_recv, 0, sizeof(struct drm_dp_sideband_msg_rx)); > + drm_dp_put_mst_branch_device(mstb); > + > + mutex_lock(&mgr->qlock); > + txmsg->state = DRM_DP_SIDEBAND_TX_RX; > + mstb->tx_slots[slot] = NULL; > + mutex_unlock(&mgr->qlock); > + > + wake_up(&mgr->tx_waitq); > + } > + return ret; > +} > + > +static int drm_dp_mst_handle_up_req(struct drm_dp_mst_topology_mgr *mgr) > +{ > + int ret = 0; > + drm_dp_get_one_sb_msg(mgr, true); > + > + if (mgr->up_req_recv.have_eomt) { > + struct drm_dp_sideband_msg_req_body msg; > + struct drm_dp_mst_branch *mstb; > + bool seqno; > + mstb = drm_dp_get_mst_branch_device(mgr, > + mgr->up_req_recv.initial_hdr.lct, > + mgr->up_req_recv.initial_hdr.rad); > + if (!mstb) { > + DRM_DEBUG_KMS("Got MST reply from unknown device %d\n", > mgr->up_req_recv.initial_hdr.lct); > + memset(&mgr->up_req_recv, 0, sizeof(struct drm_dp_sideband_msg_rx)); > + return 0; > + } > + > + seqno = mgr->up_req_recv.initial_hdr.seqno; > + drm_dp_sideband_parse_req(&mgr->up_req_recv, &msg); > + > + if (msg.req_type == DP_CONNECTION_STATUS_NOTIFY) { > + drm_dp_send_up_ack_reply(mgr, mstb, msg.req_type, seqno, false); > + drm_dp_update_port(mstb, &msg.u.conn_stat); > + DRM_DEBUG_KMS("Got CSN: pn: %d ldps:%d ddps: %d mcs: %d ip: %d pdt: > %d\n", msg.u.conn_stat.port_number, > msg.u.conn_stat.legacy_device_plug_status, > msg.u.conn_stat.displayport_device_plug_status, > msg.u.conn_stat.message_capability_status, msg.u.conn_stat.input_port, > msg.u.conn_stat.peer_device_type); > + (*mgr->cbs->hotplug)(mgr); > + > + } else if (msg.req_type == DP_RESOURCE_STATUS_NOTIFY) { > + drm_dp_send_up_ack_reply(mgr, mstb, msg.req_type, seqno, false); > + DRM_DEBUG_KMS("Got RSN: pn: %d avail_pbn %d\n", > msg.u.resource_stat.port_number, msg.u.resource_stat.available_pbn); > + } > + > + drm_dp_put_mst_branch_device(mstb); > + memset(&mgr->up_req_recv, 0, sizeof(struct drm_dp_sideband_msg_rx)); > + } > + return ret; > +} > + > +/** > + * drm_dp_mst_hpd_irq() - MST hotplug IRQ notify > + * @mgr: manager to notify irq for. > + * @esi: 4 bytes from SINK_COUNT_ESI > + * > + * This should be called from the driver when it detects a short IRQ, > + * along with the value of the DEVICE_SERVICE_IRQ_VECTOR_ESI0. The > + * topology manager will process the sideband messages received as a > result > + * of this. > + */ > +int drm_dp_mst_hpd_irq(struct drm_dp_mst_topology_mgr *mgr, u8 *esi, > bool *handled) > +{ > + int ret = 0; > + int sc; > + *handled = false; > + sc = esi[0] & 0x3f; > + if (sc != mgr->sink_count) { > + > + if (mgr->mst_primary && mgr->sink_count == 0 && sc) { > + mgr->mst_primary->link_address_sent = false; > + queue_work(system_long_wq, &mgr->work); > + } > + mgr->sink_count = sc; > + *handled = true; > + > + } > + > + if (esi[1] & DP_DOWN_REP_MSG_RDY) { > + ret = drm_dp_mst_handle_down_rep(mgr); > + *handled = true; > + } > + > + if (esi[1] & DP_UP_REQ_MSG_RDY) { > + ret |= drm_dp_mst_handle_up_req(mgr); > + *handled = true; > + } > + > + drm_dp_mst_kick_tx(mgr); > + return ret; > +} > +EXPORT_SYMBOL(drm_dp_mst_hpd_irq); > + > +/** > + * drm_dp_mst_detect_port() - get connection status for an MST port > + * @mgr: manager for this port > + * @port: unverified pointer to a port > + * > + * This returns the current connection state for a port. It validates the > + * port pointer still exists so the caller doesn't require a reference > + */ > +enum drm_connector_status drm_dp_mst_detect_port(struct > drm_dp_mst_topology_mgr *mgr, struct drm_dp_mst_port *port) > +{ > + enum drm_connector_status status = connector_status_disconnected; > + > + /* we need to search for the port in the mgr in case its gone */ > + port = drm_dp_get_validated_port_ref(mgr, port); > + if (!port) > + return connector_status_disconnected; > + > + if (!port->ddps) > + goto out; > + > + switch (port->pdt) { > + case DP_PEER_DEVICE_NONE: > + case DP_PEER_DEVICE_MST_BRANCHING: > + break; > + > + case DP_PEER_DEVICE_SST_SINK: > + status = connector_status_connected; > + break; > + case DP_PEER_DEVICE_DP_LEGACY_CONV: > + if (port->ldps) > + status = connector_status_connected; > + break; > + } > +out: > + drm_dp_put_port(port); > + return status; > +} > +EXPORT_SYMBOL(drm_dp_mst_detect_port); > + > +/** > + * drm_dp_mst_get_edid() - get EDID for an MST port > + * @connector: toplevel connector to get EDID for > + * @mgr: manager for this port > + * @port: unverified pointer to a port. > + * > + * This returns an EDID for the port connected to a connector, > + * It validates the pointer still exists so the caller doesn't require a > + * reference. > + */ > +struct edid *drm_dp_mst_get_edid(struct drm_connector *connector, > struct drm_dp_mst_topology_mgr *mgr, struct drm_dp_mst_port *port) > +{ > + struct edid *edid = NULL; > + > + /* we need to search for the port in the mgr in case its gone */ > + port = drm_dp_get_validated_port_ref(mgr, port); > + if (!port) > + return NULL; > + > + edid = drm_get_edid(connector, &port->aux.ddc); > + drm_dp_put_port(port); > + return edid; > +} > +EXPORT_SYMBOL(drm_dp_mst_get_edid); > + > +/** > + * drm_dp_find_vcpi_slots() - find slots for this PBN value > + * @mgr: manager to use > + * @pbn: payload bandwidth to convert into slots. > + */ > +int drm_dp_find_vcpi_slots(struct drm_dp_mst_topology_mgr *mgr, > + int pbn) > +{ > + int num_slots; > + > + num_slots = DIV_ROUND_UP(pbn, mgr->pbn_div); > + > + if (num_slots > mgr->avail_slots) > + return -ENOSPC; > + return num_slots; > +} > +EXPORT_SYMBOL(drm_dp_find_vcpi_slots); > + > +static int drm_dp_init_vcpi(struct drm_dp_mst_topology_mgr *mgr, > + struct drm_dp_vcpi *vcpi, int pbn) > +{ > + int num_slots; > + int ret; > + > + num_slots = DIV_ROUND_UP(pbn, mgr->pbn_div); > + > + if (num_slots > mgr->avail_slots) > + return -ENOSPC; > + > + vcpi->pbn = pbn; > + vcpi->aligned_pbn = num_slots * mgr->pbn_div; > + vcpi->num_slots = num_slots; > + > + ret = drm_dp_mst_assign_payload_id(mgr, vcpi); > + if (ret < 0) > + return ret; > + return 0; > +} > + > +/** > + * drm_dp_mst_allocate_vcpi() - Allocate a virtual channel > + * @mgr: manager for this port > + * @port: port to allocate a virtual channel for. > + * @pbn: payload bandwidth number to request > + * @slots: returned number of slots for this PBN. > + */ > +bool drm_dp_mst_allocate_vcpi(struct drm_dp_mst_topology_mgr *mgr, > struct drm_dp_mst_port *port, int pbn, int *slots) > +{ > + int ret; > + > + port = drm_dp_get_validated_port_ref(mgr, port); > + if (!port) > + return false; > + > + if (port->vcpi.vcpi > 0) { > + DRM_DEBUG_KMS("payload: vcpi %d already allocated for pbn %d - > requested pbn %d\n", port->vcpi.vcpi, port->vcpi.pbn, pbn); > + if (pbn == port->vcpi.pbn) { > + *slots = port->vcpi.num_slots; > + return true; > + } > + } > + > + ret = drm_dp_init_vcpi(mgr, &port->vcpi, pbn); > + if (ret) { > + DRM_DEBUG_KMS("failed to init vcpi %d %d %d\n", DIV_ROUND_UP(pbn, > mgr->pbn_div), mgr->avail_slots, ret); > + goto out; > + } > + DRM_DEBUG_KMS("initing vcpi for %d %d\n", pbn, port->vcpi.num_slots); > + *slots = port->vcpi.num_slots; > + > + drm_dp_put_port(port); > + return true; > +out: > + return false; > +} > +EXPORT_SYMBOL(drm_dp_mst_allocate_vcpi); > + > +/** > + * drm_dp_mst_reset_vcpi_slots() - Reset number of slots to 0 for VCPI > + * @mgr: manager for this port > + * @port: unverified pointer to a port. > + * > + * This just resets the number of slots for the ports VCPI for later > programming. > + */ > +void drm_dp_mst_reset_vcpi_slots(struct drm_dp_mst_topology_mgr *mgr, > struct drm_dp_mst_port *port) > +{ > + port = drm_dp_get_validated_port_ref(mgr, port); > + if (!port) > + return; > + port->vcpi.num_slots = 0; > + drm_dp_put_port(port); > +} > +EXPORT_SYMBOL(drm_dp_mst_reset_vcpi_slots); > + > +/** > + * drm_dp_mst_deallocate_vcpi() - deallocate a VCPI > + * @mgr: manager for this port > + * @port: unverified port to deallocate vcpi for > + */ > +void drm_dp_mst_deallocate_vcpi(struct drm_dp_mst_topology_mgr *mgr, > struct drm_dp_mst_port *port) > +{ > + port = drm_dp_get_validated_port_ref(mgr, port); > + if (!port) > + return; > + > + drm_dp_mst_put_payload_id(mgr, port->vcpi.vcpi); > + port->vcpi.num_slots = 0; > + port->vcpi.pbn = 0; > + port->vcpi.aligned_pbn = 0; > + port->vcpi.vcpi = 0; > + drm_dp_put_port(port); > +} > +EXPORT_SYMBOL(drm_dp_mst_deallocate_vcpi); > + > +static int drm_dp_dpcd_write_payload(struct drm_dp_mst_topology_mgr *mgr, > + int id, struct drm_dp_payload *payload) > +{ > + u8 payload_alloc[3], status; > + int ret; > + int retries = 0; > + > + mutex_lock(&mgr->aux_lock); > + drm_dp_dpcd_writeb(mgr->aux, DP_PAYLOAD_TABLE_UPDATE_STATUS, > + DP_PAYLOAD_TABLE_UPDATED); > + mutex_unlock(&mgr->aux_lock); > + > + payload_alloc[0] = id; > + payload_alloc[1] = payload->start_slot; > + payload_alloc[2] = payload->num_slots; > + > + mutex_lock(&mgr->aux_lock); > + ret = drm_dp_dpcd_write(mgr->aux, DP_PAYLOAD_ALLOCATE_SET, > payload_alloc, 3); > + mutex_unlock(&mgr->aux_lock); > + if (ret != 3) { > + DRM_DEBUG_KMS("failed to write payload allocation %d\n", ret); > + goto fail; > + } > + > +retry: > + mutex_lock(&mgr->aux_lock); > + ret = drm_dp_dpcd_readb(mgr->aux, DP_PAYLOAD_TABLE_UPDATE_STATUS, > &status); > + mutex_unlock(&mgr->aux_lock); > + if (ret < 0) { > + DRM_DEBUG_KMS("failed to read payload table status %d\n", ret); > + goto fail; > + } > + > + if (!(status & DP_PAYLOAD_TABLE_UPDATED)) { > + retries++; > + if (retries < 20) { > + usleep_range(10000, 20000); > + goto retry; > + } > + DRM_DEBUG_KMS("status not set after read payload table status %d\n", > status); > + ret = -EINVAL; > + goto fail; > + } > + ret = 0; > +fail: > + return ret; > +} > + > + > +/** > + * drm_dp_check_act_status() - Check ACT handled status. > + * @mgr: manager to use > + * > + * Check the payload status bits in the DPCD for ACT handled completion. > + */ > +int drm_dp_check_act_status(struct drm_dp_mst_topology_mgr *mgr) > +{ > + u8 status; > + int ret; > + int count = 0; > + > + do { > + mutex_lock(&mgr->aux_lock); > + ret = drm_dp_dpcd_readb(mgr->aux, DP_PAYLOAD_TABLE_UPDATE_STATUS, > &status); > + mutex_unlock(&mgr->aux_lock); > + > + if (ret < 0) { > + DRM_DEBUG_KMS("failed to read payload table status %d\n", ret); > + goto fail; > + } > + > + if (status & DP_PAYLOAD_ACT_HANDLED) > + break; > + count++; > + udelay(100); > + > + } while (count < 30); > + > + if (!(status & DP_PAYLOAD_ACT_HANDLED)) { > + DRM_DEBUG_KMS("failed to get ACT bit %d after %d retries\n", status, > count); > + ret = -EINVAL; > + goto fail; > + } > + return 0; > +fail: > + return ret; > +} > +EXPORT_SYMBOL(drm_dp_check_act_status); > + > +/** > + * drm_dp_calc_pbn_mode() - Calculate the PBN for a mode. > + * @clock: dot clock for the mode > + * @bpp: bpp for the mode. > + * > + * This uses the formula in the spec to calculate the PBN value for a > mode. > + */ > +int drm_dp_calc_pbn_mode(int clock, int bpp) > +{ > + fixed20_12 pix_bw; > + fixed20_12 fbpp; > + fixed20_12 result; > + fixed20_12 margin, tmp; > + u32 res; > + > + pix_bw.full = dfixed_const(clock); > + fbpp.full = dfixed_const(bpp); > + tmp.full = dfixed_const(8); > + fbpp.full = dfixed_div(fbpp, tmp); > + > + result.full = dfixed_mul(pix_bw, fbpp); > + margin.full = dfixed_const(54); > + tmp.full = dfixed_const(64); > + margin.full = dfixed_div(margin, tmp); > + result.full = dfixed_div(result, margin); > + > + margin.full = dfixed_const(1006); > + tmp.full = dfixed_const(1000); > + margin.full = dfixed_div(margin, tmp); > + result.full = dfixed_mul(result, margin); > + > + result.full = dfixed_div(result, tmp); > + result.full = dfixed_ceil(result); > + res = dfixed_trunc(result); > + return res; > +} > +EXPORT_SYMBOL(drm_dp_calc_pbn_mode); > + > +static int test_calc_pbn_mode(void) > +{ > + int ret; > + ret = drm_dp_calc_pbn_mode(154000, 30); > + if (ret != 689) > + return -EINVAL; > + ret = drm_dp_calc_pbn_mode(234000, 30); > + if (ret != 1047) > + return -EINVAL; > + return 0; > +} > + > +/* we want to kick the TX after we've ack the up/down IRQs. */ > +static void drm_dp_mst_kick_tx(struct drm_dp_mst_topology_mgr *mgr) > +{ > + queue_work(system_long_wq, &mgr->tx_work); > +} > + > +static void drm_dp_mst_dump_mstb(struct seq_file *m, > + struct drm_dp_mst_branch *mstb) > +{ > + struct drm_dp_mst_port *port; > + int tabs = mstb->lct; > + char prefix[10]; > + int i; > + > + for (i = 0; i < tabs; i++) > + prefix[i] = '\t'; > + prefix[i] = '\0'; > + > + seq_printf(m, "%smst: %p, %d\n", prefix, mstb, mstb->num_ports); > + list_for_each_entry(port, &mstb->ports, next) { > + seq_printf(m, "%sport: %d: ddps: %d ldps: %d, %p, conn: %p\n", > prefix, port->port_num, port->ddps, port->ldps, port, port->connector); > + if (port->mstb) > + drm_dp_mst_dump_mstb(m, port->mstb); > + } > +} > + > +static bool dump_dp_payload_table(struct drm_dp_mst_topology_mgr *mgr, > + char *buf) > +{ > + int ret; > + int i; > + mutex_lock(&mgr->aux_lock); > + for (i = 0; i < 4; i++) { > + ret = drm_dp_dpcd_read(mgr->aux, DP_PAYLOAD_TABLE_UPDATE_STATUS + (i > * 16), &buf[i * 16], 16); > + if (ret != 16) > + break; > + } > + mutex_unlock(&mgr->aux_lock); > + if (i == 4) > + return true; > + return false; > +} > + > +/** > + * drm_dp_mst_dump_topology(): dump topology to seq file. > + * @m: seq_file to dump output to > + * @mgr: manager to dump current topology for. > + * > + * helper to dump MST topology to a seq file for debugfs. > + */ > +void drm_dp_mst_dump_topology(struct seq_file *m, > + struct drm_dp_mst_topology_mgr *mgr) > +{ > + int i; > + struct drm_dp_mst_port *port; > + mutex_lock(&mgr->lock); > + if (mgr->mst_primary) > + drm_dp_mst_dump_mstb(m, mgr->mst_primary); > + > + /* dump VCPIs */ > + mutex_unlock(&mgr->lock); > + > + mutex_lock(&mgr->payload_lock); > + seq_printf(m, "vcpi: %lx\n", mgr->payload_mask); > + > + for (i = 0; i < mgr->max_payloads; i++) { > + if (mgr->proposed_vcpis[i]) { > + port = container_of(mgr->proposed_vcpis[i], struct drm_dp_mst_port, > vcpi); > + seq_printf(m, "vcpi %d: %d %d %d\n", i, port->port_num, > port->vcpi.vcpi, port->vcpi.num_slots); > + } else > + seq_printf(m, "vcpi %d:unsed\n", i); > + } > + for (i = 0; i < mgr->max_payloads; i++) { > + seq_printf(m, "payload %d: %d, %d, %d\n", > + i, > + mgr->payloads[i].payload_state, > + mgr->payloads[i].start_slot, > + mgr->payloads[i].num_slots); > + > + > + } > + mutex_unlock(&mgr->payload_lock); > + > + mutex_lock(&mgr->lock); > + if (mgr->mst_primary) { > + u8 buf[64]; > + bool bret; > + int ret; > + ret = drm_dp_dpcd_read(mgr->aux, DP_DPCD_REV, buf, > DP_RECEIVER_CAP_SIZE); > + seq_printf(m, "dpcd: "); > + for (i = 0; i < DP_RECEIVER_CAP_SIZE; i++) > + seq_printf(m, "%02x ", buf[i]); > + seq_printf(m, "\n"); > + ret = drm_dp_dpcd_read(mgr->aux, DP_FAUX_CAP, buf, 2); > + seq_printf(m, "faux/mst: "); > + for (i = 0; i < 2; i++) > + seq_printf(m, "%02x ", buf[i]); > + seq_printf(m, "\n"); > + ret = drm_dp_dpcd_read(mgr->aux, DP_MSTM_CTRL, buf, 1); > + seq_printf(m, "mst ctrl: "); > + for (i = 0; i < 1; i++) > + seq_printf(m, "%02x ", buf[i]); > + seq_printf(m, "\n"); > + > + bret = dump_dp_payload_table(mgr, buf); > + if (bret == true) { > + seq_printf(m, "payload table: "); > + for (i = 0; i < 63; i++) > + seq_printf(m, "%02x ", buf[i]); > + seq_printf(m, "\n"); > + } > + > + } > + > + mutex_unlock(&mgr->lock); > + > +} > +EXPORT_SYMBOL(drm_dp_mst_dump_topology); > + > +static void drm_dp_tx_work(struct work_struct *work) > +{ > + struct drm_dp_mst_topology_mgr *mgr = container_of(work, struct > drm_dp_mst_topology_mgr, tx_work); > + > + mutex_lock(&mgr->qlock); > + if (mgr->tx_down_in_progress) > + process_single_down_tx_qlock(mgr); > + mutex_unlock(&mgr->qlock); > +} > + > +/** > + * drm_dp_mst_topology_mgr_init - initialise a topology manager > + * @mgr: manager struct to initialise > + * @dev: device providing this structure - for i2c addition. > + * @aux: DP helper aux channel to talk to this device > + * @max_dpcd_transaction_bytes: hw specific DPCD transaction limit > + * @max_payloads: maximum number of payloads this GPU can source > + * @conn_base_id: the connector object ID the MST device is connected to. > + * > + * Return 0 for success, or negative error code on failure > + */ > +int drm_dp_mst_topology_mgr_init(struct drm_dp_mst_topology_mgr *mgr, > + struct device *dev, struct drm_dp_aux *aux, > + int max_dpcd_transaction_bytes, > + int max_payloads, int conn_base_id) > +{ > + mutex_init(&mgr->lock); > + mutex_init(&mgr->qlock); > + mutex_init(&mgr->aux_lock); > + mutex_init(&mgr->payload_lock); > + INIT_LIST_HEAD(&mgr->tx_msg_upq); > + INIT_LIST_HEAD(&mgr->tx_msg_downq); > + INIT_WORK(&mgr->work, drm_dp_mst_link_probe_work); > + INIT_WORK(&mgr->tx_work, drm_dp_tx_work); > + init_waitqueue_head(&mgr->tx_waitq); > + mgr->dev = dev; > + mgr->aux = aux; > + mgr->max_dpcd_transaction_bytes = max_dpcd_transaction_bytes; > + mgr->max_payloads = max_payloads; > + mgr->conn_base_id = conn_base_id; > + mgr->payloads = kcalloc(max_payloads, sizeof(struct drm_dp_payload), > GFP_KERNEL); > + if (!mgr->payloads) > + return -ENOMEM; > + mgr->proposed_vcpis = kcalloc(max_payloads, sizeof(struct > drm_dp_vcpi *), GFP_KERNEL); > + if (!mgr->proposed_vcpis) > + return -ENOMEM; > + set_bit(0, &mgr->payload_mask); > + test_calc_pbn_mode(); > + return 0; > +} > +EXPORT_SYMBOL(drm_dp_mst_topology_mgr_init); > + > +/** > + * drm_dp_mst_topology_mgr_destroy() - destroy topology manager. > + * @mgr: manager to destroy > + */ > +void drm_dp_mst_topology_mgr_destroy(struct drm_dp_mst_topology_mgr *mgr) > +{ > + mutex_lock(&mgr->payload_lock); > + kfree(mgr->payloads); > + mgr->payloads = NULL; > + kfree(mgr->proposed_vcpis); > + mgr->proposed_vcpis = NULL; > + mutex_unlock(&mgr->payload_lock); > + mgr->dev = NULL; > + mgr->aux = NULL; > +} > +EXPORT_SYMBOL(drm_dp_mst_topology_mgr_destroy); > + > +/* I2C device */ > +static int drm_dp_mst_i2c_xfer(struct i2c_adapter *adapter, struct > i2c_msg *msgs, > + int num) > +{ > + struct drm_dp_aux *aux = adapter->algo_data; > + struct drm_dp_mst_port *port = container_of(aux, struct > drm_dp_mst_port, aux); > + struct drm_dp_mst_branch *mstb; > + struct drm_dp_mst_topology_mgr *mgr = port->mgr; > + unsigned int i; > + bool reading = false; > + struct drm_dp_sideband_msg_req_body msg; > + struct drm_dp_sideband_msg_tx *txmsg = NULL; > + int ret; > + > + mstb = drm_dp_get_validated_mstb_ref(mgr, port->parent); > + if (!mstb) > + return -EREMOTEIO; > + > + /* construct i2c msg */ > + /* see if last msg is a read */ > + if (msgs[num - 1].flags & I2C_M_RD) > + reading = true; > + > + if (!reading) { > + DRM_DEBUG_KMS("Unsupported I2C transaction for MST device\n"); > + ret = -EIO; > + goto out; > + } > + > + msg.req_type = DP_REMOTE_I2C_READ; > + msg.u.i2c_read.num_transactions = num - 1; > + msg.u.i2c_read.port_number = port->port_num; > + for (i = 0; i < num - 1; i++) { > + msg.u.i2c_read.transactions[i].i2c_dev_id = msgs[i].addr; > + msg.u.i2c_read.transactions[i].num_bytes = msgs[i].len; > + memcpy(&msg.u.i2c_read.transactions[i].bytes, msgs[i].buf, msgs[i].len); > + } > + msg.u.i2c_read.read_i2c_device_id = msgs[num - 1].addr; > + msg.u.i2c_read.num_bytes_read = msgs[num - 1].len; > + > + txmsg = kzalloc(sizeof(*txmsg), GFP_KERNEL); > + if (!txmsg) { > + ret = -ENOMEM; > + goto out; > + } > + > + txmsg->dst = mstb; > + drm_dp_encode_sideband_req(&msg, txmsg); > + > + drm_dp_queue_down_tx(mgr, txmsg); > + > + ret = drm_dp_mst_wait_tx_reply(mstb, txmsg); > + if (ret > 0) { > + > + if (txmsg->reply.reply_type == 1) { /* got a NAK back */ > + ret = -EREMOTEIO; > + goto out; > + } > + if (txmsg->reply.u.remote_i2c_read_ack.num_bytes != msgs[num - 1].len) { > + ret = -EIO; > + goto out; > + } > + memcpy(msgs[num - 1].buf, txmsg->reply.u.remote_i2c_read_ack.bytes, > msgs[num - 1].len); > + ret = num; > + } > +out: > + kfree(txmsg); > + drm_dp_put_mst_branch_device(mstb); > + return ret; > +} > + > +static u32 drm_dp_mst_i2c_functionality(struct i2c_adapter *adapter) > +{ > + return I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL | > + I2C_FUNC_SMBUS_READ_BLOCK_DATA | > + I2C_FUNC_SMBUS_BLOCK_PROC_CALL | > + I2C_FUNC_10BIT_ADDR; > +} > + > +static const struct i2c_algorithm drm_dp_mst_i2c_algo = { > + .functionality = drm_dp_mst_i2c_functionality, > + .master_xfer = drm_dp_mst_i2c_xfer, > +}; > + > +/** > + * drm_dp_mst_register_i2c_bus() - register an I2C adapter for > I2C-over-AUX > + * @aux: DisplayPort AUX channel > + * > + * Returns 0 on success or a negative error code on failure. > + */ > +static int drm_dp_mst_register_i2c_bus(struct drm_dp_aux *aux) > +{ > + aux->ddc.algo = &drm_dp_mst_i2c_algo; > + aux->ddc.algo_data = aux; > + aux->ddc.retries = 3; > + > + aux->ddc.class = I2C_CLASS_DDC; > + aux->ddc.owner = THIS_MODULE; > + aux->ddc.dev.parent = aux->dev; > + aux->ddc.dev.of_node = aux->dev->of_node; > + > + strlcpy(aux->ddc.name, aux->name ? aux->name : dev_name(aux->dev), > + sizeof(aux->ddc.name)); > + > + return i2c_add_adapter(&aux->ddc); > +} > + > +/** > + * drm_dp_mst_unregister_i2c_bus() - unregister an I2C-over-AUX adapter > + * @aux: DisplayPort AUX channel > + */ > +static void drm_dp_mst_unregister_i2c_bus(struct drm_dp_aux *aux) > +{ > + i2c_del_adapter(&aux->ddc); > +} > diff --git a/include/drm/drm_dp_mst_helper.h > b/include/drm/drm_dp_mst_helper.h > new file mode 100644 > index 0000000..6626d1b > --- /dev/null > +++ b/include/drm/drm_dp_mst_helper.h > @@ -0,0 +1,507 @@ > +/* > + * Copyright © 2014 Red Hat. > + * > + * Permission to use, copy, modify, distribute, and sell this > software and its > + * documentation for any purpose is hereby granted without fee, > provided that > + * the above copyright notice appear in all copies and that both that > copyright > + * notice and this permission notice appear in supporting > documentation, and > + * that the name of the copyright holders not be used in advertising or > + * publicity pertaining to distribution of the software without specific, > + * written prior permission. The copyright holders make no > representations > + * about the suitability of this software for any purpose. It is > provided "as > + * is" without express or implied warranty. > + * > + * THE COPYRIGHT HOLDERS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS > SOFTWARE, > + * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO > + * EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY SPECIAL, > INDIRECT OR > + * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM > LOSS OF USE, > + * DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER > + * TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR > PERFORMANCE > + * OF THIS SOFTWARE. > + */ > +#ifndef _DRM_DP_MST_HELPER_H_ > +#define _DRM_DP_MST_HELPER_H_ > + > +#include <linux/types.h> > +#include <drm/drm_dp_helper.h> > + > +struct drm_dp_mst_branch; > + > +/** > + * struct drm_dp_vcpi - Virtual Channel Payload Identifer > + * @vcpi: Virtual channel ID. > + * @pbn: Payload Bandwidth Number for this channel > + * @aligned_pbn: PBN aligned with slot size > + * @num_slots: number of slots for this PBN > + */ > +struct drm_dp_vcpi { > + int vcpi; > + int pbn; > + int aligned_pbn; > + int num_slots; > +}; > + > +/** > + * struct drm_dp_mst_port - MST port > + * @kref: reference count for this port. > + * @guid_valid: for DP 1.2 devices if we have validated the GUID. > + * @guid: guid for DP 1.2 device on this port. > + * @port_num: port number > + * @input: if this port is an input port. > + * @mcs: message capability status - DP 1.2 spec. > + * @ddps: DisplayPort Device Plug Status - DP 1.2 > + * @pdt: Peer Device Type > + * @ldps: Legacy Device Plug Status > + * @dpcd_rev: DPCD revision of device on this port > + * @available_pbn: Available bandwidth for this port. > + * @next: link to next port on this branch device > + * @mstb: branch device attach below this port > + * @aux: i2c aux transport to talk to device connected to this port. > + * @parent: branch device parent of this port > + * @vcpi: Virtual Channel Payload info for this port. > + * @connector: DRM connector this port is connected to. > + * @mgr: topology manager this port lives under. > + * > + * This structure represents an MST port endpoint on a device somewhere > + * in the MST topology. > + */ > +struct drm_dp_mst_port { > + struct kref kref; > + > + /* if dpcd 1.2 device is on this port - its GUID info */ > + bool guid_valid; > + u8 guid[16]; > + > + u8 port_num; > + bool input; > + bool mcs; > + bool ddps; > + u8 pdt; > + bool ldps; > + u8 dpcd_rev; > + uint16_t available_pbn; > + struct list_head next; > + struct drm_dp_mst_branch *mstb; /* pointer to an mstb if this port > has one */ > + struct drm_dp_aux aux; /* i2c bus for this port? */ > + struct drm_dp_mst_branch *parent; > + > + struct drm_dp_vcpi vcpi; > + struct drm_connector *connector; > + struct drm_dp_mst_topology_mgr *mgr; > +}; > + > +/** > + * struct drm_dp_mst_branch - MST branch device. > + * @kref: reference count for this port. > + * @rad: Relative Address to talk to this branch device. > + * @lct: Link count total to talk to this branch device. > + * @num_ports: number of ports on the branch. > + * @msg_slots: one bit per transmitted msg slot. > + * @ports: linked list of ports on this branch. > + * @port_parent: pointer to the port parent, NULL if toplevel. > + * @mgr: topology manager for this branch device. > + * @tx_slots: transmission slots for this device. > + * @last_seqno: last sequence number used to talk to this. > + * @link_address_sent: if a link address message has been sent to > this device yet. > + * > + * This structure represents an MST branch device, there is one > + * primary branch device at the root, along with any others connected > + * to downstream ports > + */ > +struct drm_dp_mst_branch { > + struct kref kref; > + u8 rad[8]; > + u8 lct; > + int num_ports; > + > + int msg_slots; > + struct list_head ports; > + > + /* list of tx ops queue for this port */ > + struct drm_dp_mst_port *port_parent; > + struct drm_dp_mst_topology_mgr *mgr; > + > + /* slots are protected by mstb->mgr->qlock */ > + struct drm_dp_sideband_msg_tx *tx_slots[2]; > + int last_seqno; > + bool link_address_sent; > +}; > + > + > +/* sideband msg header - not bit struct */ > +struct drm_dp_sideband_msg_hdr { > + u8 lct; > + u8 lcr; > + u8 rad[8]; > + bool broadcast; > + bool path_msg; > + u8 msg_len; > + bool somt; > + bool eomt; > + bool seqno; > +}; > + > +struct drm_dp_nak_reply { > + u8 guid[16]; > + u8 reason; > + u8 nak_data; > +}; > + > +struct drm_dp_link_address_ack_reply { > + u8 guid[16]; > + u8 nports; > + struct drm_dp_link_addr_reply_port { > + bool input_port; > + u8 peer_device_type; > + u8 port_number; > + bool mcs; > + bool ddps; > + bool legacy_device_plug_status; > + u8 dpcd_revision; > + u8 peer_guid[16]; > + bool num_sdp_streams; > + bool num_sdp_stream_sinks; > + } ports[16]; > +}; > + > +struct drm_dp_remote_dpcd_read_ack_reply { > + u8 port_number; > + u8 num_bytes; > + u8 bytes[255]; > +}; > + > +struct drm_dp_remote_dpcd_write_ack_reply { > + u8 port_number; > +}; > + > +struct drm_dp_remote_dpcd_write_nak_reply { > + u8 port_number; > + u8 reason; > + u8 bytes_written_before_failure; > +}; > + > +struct drm_dp_remote_i2c_read_ack_reply { > + u8 port_number; > + u8 num_bytes; > + u8 bytes[255]; > +}; > + > +struct drm_dp_remote_i2c_read_nak_reply { > + u8 port_number; > + u8 nak_reason; > + u8 i2c_nak_transaction; > +}; > + > +struct drm_dp_remote_i2c_write_ack_reply { > + u8 port_number; > +}; > + > + > +struct drm_dp_sideband_msg_rx { > + u8 chunk[48]; > + u8 msg[256]; > + u8 curchunk_len; > + u8 curchunk_idx; /* chunk we are parsing now */ > + u8 curchunk_hdrlen; > + u8 curlen; /* total length of the msg */ > + bool have_somt; > + bool have_eomt; > + struct drm_dp_sideband_msg_hdr initial_hdr; > +}; > + > + > +struct drm_dp_allocate_payload { > + u8 port_number; > + u8 number_sdp_streams; > + u8 vcpi; > + u16 pbn; > + u8 sdp_stream_sink[8]; > +}; > + > +struct drm_dp_allocate_payload_ack_reply { > + u8 port_number; > + u8 vcpi; > + u16 allocated_pbn; > +}; > + > +struct drm_dp_connection_status_notify { > + u8 guid[16]; > + u8 port_number; > + bool legacy_device_plug_status; > + bool displayport_device_plug_status; > + bool message_capability_status; > + bool input_port; > + u8 peer_device_type; > +}; > + > +struct drm_dp_remote_dpcd_read { > + u8 port_number; > + u32 dpcd_address; > + u8 num_bytes; > +}; > + > +struct drm_dp_remote_dpcd_write { > + u8 port_number; > + u32 dpcd_address; > + u8 num_bytes; > + u8 bytes[255]; > +}; > + > +struct drm_dp_remote_i2c_read { > + u8 num_transactions; > + u8 port_number; > + struct { > + u8 i2c_dev_id; > + u8 num_bytes; > + u8 bytes[255]; > + u8 no_stop_bit; > + u8 i2c_transaction_delay; > + } transactions[4]; > + u8 read_i2c_device_id; > + u8 num_bytes_read; > +}; > + > +struct drm_dp_remote_i2c_write { > + u8 port_number; > + u8 write_i2c_device_id; > + u8 num_bytes; > + u8 bytes[255]; > +}; > + > +/* this covers ENUM_RESOURCES, POWER_DOWN_PHY, POWER_UP_PHY */ > +struct drm_dp_port_number_req { > + u8 port_number; > +}; > + > +struct drm_dp_enum_path_resources_ack_reply { > + u8 port_number; > + u16 full_payload_bw_number; > + u16 avail_payload_bw_number; > +}; > + > +/* covers POWER_DOWN_PHY, POWER_UP_PHY */ > +struct drm_dp_port_number_rep { > + u8 port_number; > +}; > + > +struct drm_dp_query_payload { > + u8 port_number; > + u8 vcpi; > +}; > + > +struct drm_dp_resource_status_notify { > + u8 port_number; > + u8 guid[16]; > + u16 available_pbn; > +}; > + > +struct drm_dp_query_payload_ack_reply { > + u8 port_number; > + u8 allocated_pbn; > +}; > + > +struct drm_dp_sideband_msg_req_body { > + u8 req_type; > + union ack_req { > + struct drm_dp_connection_status_notify conn_stat; > + struct drm_dp_port_number_req port_num; > + struct drm_dp_resource_status_notify resource_stat; > + > + struct drm_dp_query_payload query_payload; > + struct drm_dp_allocate_payload allocate_payload; > + > + struct drm_dp_remote_dpcd_read dpcd_read; > + struct drm_dp_remote_dpcd_write dpcd_write; > + > + struct drm_dp_remote_i2c_read i2c_read; > + struct drm_dp_remote_i2c_write i2c_write; > + } u; > +}; > + > +struct drm_dp_sideband_msg_reply_body { > + u8 reply_type; > + u8 req_type; > + union ack_replies { > + struct drm_dp_nak_reply nak; > + struct drm_dp_link_address_ack_reply link_addr; > + struct drm_dp_port_number_rep port_number; > + > + struct drm_dp_enum_path_resources_ack_reply path_resources; > + struct drm_dp_allocate_payload_ack_reply allocate_payload; > + struct drm_dp_query_payload_ack_reply query_payload; > + > + struct drm_dp_remote_dpcd_read_ack_reply remote_dpcd_read_ack; > + struct drm_dp_remote_dpcd_write_ack_reply remote_dpcd_write_ack; > + struct drm_dp_remote_dpcd_write_nak_reply remote_dpcd_write_nack; > + > + struct drm_dp_remote_i2c_read_ack_reply remote_i2c_read_ack; > + struct drm_dp_remote_i2c_read_nak_reply remote_i2c_read_nack; > + struct drm_dp_remote_i2c_write_ack_reply remote_i2c_write_ack; > + } u; > +}; > + > +/* msg is queued to be put into a slot */ > +#define DRM_DP_SIDEBAND_TX_QUEUED 0 > +/* msg has started transmitting on a slot - still on msgq */ > +#define DRM_DP_SIDEBAND_TX_START_SEND 1 > +/* msg has finished transmitting on a slot - removed from msgq only > in slot */ > +#define DRM_DP_SIDEBAND_TX_SENT 2 > +/* msg has received a response - removed from slot */ > +#define DRM_DP_SIDEBAND_TX_RX 3 > +#define DRM_DP_SIDEBAND_TX_TIMEOUT 4 > + > +struct drm_dp_sideband_msg_tx { > + u8 msg[256]; > + u8 chunk[48]; > + u8 cur_offset; > + u8 cur_len; > + struct drm_dp_mst_branch *dst; > + struct list_head next; > + int seqno; > + int state; > + bool path_msg; > + struct drm_dp_sideband_msg_reply_body reply; > +}; > + > +/* sideband msg handler */ > +struct drm_dp_mst_topology_mgr; > +struct drm_dp_mst_topology_cbs { > + /* create a connector for a port */ > + struct drm_connector *(*add_connector)(struct > drm_dp_mst_topology_mgr *mgr, struct drm_dp_mst_port *port, char *path); > + void (*destroy_connector)(struct drm_dp_mst_topology_mgr *mgr, > + struct drm_connector *connector); > + void (*hotplug)(struct drm_dp_mst_topology_mgr *mgr); > + > +}; > + > +#define DP_MAX_PAYLOAD (sizeof(unsigned long) * 8) > + > +#define DP_PAYLOAD_LOCAL 1 > +#define DP_PAYLOAD_REMOTE 2 > +#define DP_PAYLOAD_DELETE_LOCAL 3 > + > +struct drm_dp_payload { > + int payload_state; > + int start_slot; > + int num_slots; > +}; > + > +/** > + * struct drm_dp_mst_topology_mgr - DisplayPort MST manager > + * @dev: device pointer for adding i2c devices etc. > + * @cbs: callbacks for connector addition and destruction. > + * @max_dpcd_transaction_bytes - maximum number of bytes to > read/write in one go. > + * @aux: aux channel for the DP connector. > + * @max_payloads: maximum number of payloads the GPU can generate. > + * @conn_base_id: DRM connector ID this mgr is connected to. > + * @down_rep_recv: msg receiver state for down replies. > + * @up_req_recv: msg receiver state for up requests. > + * @lock: protects mst state, primary, guid, dpcd. > + * @aux_lock: protects aux channel. > + * @mst_state: if this manager is enabled for an MST capable port. > + * @mst_primary: pointer to the primary branch device. > + * @guid_valid: GUID valid for the primary branch device. > + * @guid: GUID for primary port. > + * @dpcd: cache of DPCD for primary port. > + * @pbn_div: PBN to slots divisor. > + * > + * This struct represents the toplevel displayport MST topology manager. > + * There should be one instance of this for every MST capable DP > connector > + * on the GPU. > + */ > +struct drm_dp_mst_topology_mgr { > + > + struct device *dev; > + struct drm_dp_mst_topology_cbs *cbs; > + int max_dpcd_transaction_bytes; > + struct drm_dp_aux *aux; /* auxch for this topology mgr to use */ > + int max_payloads; > + int conn_base_id; > + > + /* only ever accessed from the workqueue - which should be serialised */ > + struct drm_dp_sideband_msg_rx down_rep_recv; > + struct drm_dp_sideband_msg_rx up_req_recv; > + > + /* pointer to info about the initial MST device */ > + struct mutex lock; /* protects mst_state + primary + guid + dpcd */ > + > + struct mutex aux_lock; /* protect access to the AUX */ > + bool mst_state; > + struct drm_dp_mst_branch *mst_primary; > + /* primary MST device GUID */ > + bool guid_valid; > + u8 guid[16]; > + u8 dpcd[DP_RECEIVER_CAP_SIZE]; > + u8 sink_count; > + int pbn_div; > + int total_slots; > + int avail_slots; > + int total_pbn; > + > + /* messages to be transmitted */ > + /* qlock protects the upq/downq and in_progress, > + the mstb tx_slots and txmsg->state once they are queued */ > + struct mutex qlock; > + struct list_head tx_msg_downq; > + struct list_head tx_msg_upq; > + bool tx_down_in_progress; > + bool tx_up_in_progress; > + > + /* payload info + lock for it */ > + struct mutex payload_lock; > + struct drm_dp_vcpi **proposed_vcpis; > + struct drm_dp_payload *payloads; > + unsigned long payload_mask; > + > + wait_queue_head_t tx_waitq; > + struct work_struct work; > + > + struct work_struct tx_work; > +}; > + > +int drm_dp_mst_topology_mgr_init(struct drm_dp_mst_topology_mgr *mgr, > struct device *dev, struct drm_dp_aux *aux, int > max_dpcd_transaction_bytes, int max_payloads, int conn_base_id); > + > +void drm_dp_mst_topology_mgr_destroy(struct drm_dp_mst_topology_mgr > *mgr); > + > + > +int drm_dp_mst_topology_mgr_set_mst(struct drm_dp_mst_topology_mgr > *mgr, bool mst_state); > + > + > +int drm_dp_mst_hpd_irq(struct drm_dp_mst_topology_mgr *mgr, u8 *esi, > bool *handled); > + > + > +enum drm_connector_status drm_dp_mst_detect_port(struct > drm_dp_mst_topology_mgr *mgr, struct drm_dp_mst_port *port); > + > +struct edid *drm_dp_mst_get_edid(struct drm_connector *connector, > struct drm_dp_mst_topology_mgr *mgr, struct drm_dp_mst_port *port); > + > + > +int drm_dp_calc_pbn_mode(int clock, int bpp); > + > + > +bool drm_dp_mst_allocate_vcpi(struct drm_dp_mst_topology_mgr *mgr, > struct drm_dp_mst_port *port, int pbn, int *slots); > + > + > +void drm_dp_mst_reset_vcpi_slots(struct drm_dp_mst_topology_mgr *mgr, > struct drm_dp_mst_port *port); > + > + > +void drm_dp_mst_deallocate_vcpi(struct drm_dp_mst_topology_mgr *mgr, > + struct drm_dp_mst_port *port); > + > + > +int drm_dp_find_vcpi_slots(struct drm_dp_mst_topology_mgr *mgr, > + int pbn); > + > + > +int drm_dp_update_payload_part1(struct drm_dp_mst_topology_mgr *mgr); > + > + > +int drm_dp_update_payload_part2(struct drm_dp_mst_topology_mgr *mgr); > + > +int drm_dp_check_act_status(struct drm_dp_mst_topology_mgr *mgr); > + > +void drm_dp_mst_dump_topology(struct seq_file *m, > + struct drm_dp_mst_topology_mgr *mgr); > + > +void drm_dp_mst_topology_mgr_suspend(struct drm_dp_mst_topology_mgr > *mgr); > +int drm_dp_mst_topology_mgr_resume(struct drm_dp_mst_topology_mgr *mgr); > +#endif > Dave Airlie <mailto:airlied@gmail.com> > Tuesday, May 20, 2014 7:54 PM > Hey, > > So this set is pretty close to what I think we should be merging > initially, > > Since the last set, it makes fbcon and suspend/resume work a lot better, > > I've also fixed a couple of bugs in -intel that make things work a lot > better. > > I've bashed on this a bit using kms-flip from intel-gpu-tools, hacked > to add 3 monitor support. > > It still generates a fair few i915 state checker backtraces, and some > of them are fairly hard to work out, it might be we should just tone > down the state checker for encoders/connectors with no actual hw backing > them. > > Dave. > > _______________________________________________ > Intel-gfx mailing list > Intel-gfx@lists.freedesktop.org > http://lists.freedesktop.org/mailman/listinfo/intel-gfx
diff --git a/Documentation/DocBook/drm.tmpl b/Documentation/DocBook/drm.tmpl index 83dd0b0..1883976 100644 --- a/Documentation/DocBook/drm.tmpl +++ b/Documentation/DocBook/drm.tmpl @@ -2296,6 +2296,12 @@ void intel_crt_init(struct drm_device *dev) !Edrivers/gpu/drm/drm_dp_helper.c </sect2> <sect2> + <title>Display Port MST Helper Functions Reference</title> +!Pdrivers/gpu/drm/drm_dp_mst_topology.c dp mst helper +!Iinclude/drm/drm_dp_mst_helper.h +!Edrivers/gpu/drm/drm_dp_mst_topology.c + </sect2> + <sect2> <title>EDID Helper Functions Reference</title> !Edrivers/gpu/drm/drm_edid.c </sect2> diff --git a/drivers/gpu/drm/Makefile b/drivers/gpu/drm/Makefile index 48e38ba..712b73e 100644 --- a/drivers/gpu/drm/Makefile +++ b/drivers/gpu/drm/Makefile @@ -23,7 +23,7 @@ drm-$(CONFIG_DRM_PANEL) += drm_panel.o drm-usb-y := drm_usb.o -drm_kms_helper-y := drm_crtc_helper.o drm_dp_helper.o drm_probe_helper.o +drm_kms_helper-y := drm_crtc_helper.o drm_dp_helper.o drm_probe_helper.o drm_dp_mst_topology.o drm_kms_helper-$(CONFIG_DRM_LOAD_EDID_FIRMWARE) += drm_edid_load.o drm_kms_helper-$(CONFIG_DRM_KMS_FB_HELPER) += drm_fb_helper.o drm_kms_helper-$(CONFIG_DRM_KMS_CMA_HELPER) += drm_fb_cma_helper.o diff --git a/drivers/gpu/drm/drm_dp_mst_topology.c b/drivers/gpu/drm/drm_dp_mst_topology.c new file mode 100644 index 0000000..ebd9292 --- /dev/null +++ b/drivers/gpu/drm/drm_dp_mst_topology.c @@ -0,0 +1,2739 @@ +/* + * Copyright © 2014 Red Hat + * + * Permission to use, copy, modify, distribute, and sell this software and its + * documentation for any purpose is hereby granted without fee, provided that + * the above copyright notice appear in all copies and that both that copyright + * notice and this permission notice appear in supporting documentation, and + * that the name of the copyright holders not be used in advertising or + * publicity pertaining to distribution of the software without specific, + * written prior permission. The copyright holders make no representations + * about the suitability of this software for any purpose. It is provided "as + * is" without express or implied warranty. + * + * THE COPYRIGHT HOLDERS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, + * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO + * EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY SPECIAL, INDIRECT OR + * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, + * DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER + * TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE + * OF THIS SOFTWARE. + */ + +#include <linux/kernel.h> +#include <linux/delay.h> +#include <linux/init.h> +#include <linux/errno.h> +#include <linux/sched.h> +#include <linux/i2c.h> +#include <drm/drm_dp_mst_helper.h> +#include <drm/drmP.h> + +#include <drm/drm_fixed.h> + +/** + * DOC: dp mst helper + * + * These functions contain parts of the DisplayPort 1.2a MultiStream Transport + * protocol. The helpers contain a topology manager and bandwidth manager. + * The helpers encapsulate the sending and received of sideband msgs. + */ +static bool dump_dp_payload_table(struct drm_dp_mst_topology_mgr *mgr, + char *buf); +static int test_calc_pbn_mode(void); + +static void drm_dp_put_port(struct drm_dp_mst_port *port); + +static int drm_dp_dpcd_write_payload(struct drm_dp_mst_topology_mgr *mgr, + int id, + struct drm_dp_payload *payload); + +static int drm_dp_send_dpcd_write(struct drm_dp_mst_topology_mgr *mgr, + struct drm_dp_mst_port *port, + int offset, int size, u8 *bytes); + +static int drm_dp_send_link_address(struct drm_dp_mst_topology_mgr *mgr, + struct drm_dp_mst_branch *mstb); +static int drm_dp_send_enum_path_resources(struct drm_dp_mst_topology_mgr *mgr, + struct drm_dp_mst_branch *mstb, + struct drm_dp_mst_port *port); +static bool drm_dp_validate_guid(struct drm_dp_mst_topology_mgr *mgr, + u8 *guid); + +static int drm_dp_mst_register_i2c_bus(struct drm_dp_aux *aux); +static void drm_dp_mst_unregister_i2c_bus(struct drm_dp_aux *aux); +static void drm_dp_mst_kick_tx(struct drm_dp_mst_topology_mgr *mgr); +/* sideband msg handling */ +static u8 drm_dp_msg_header_crc4(const uint8_t *data, size_t num_nibbles) +{ + u8 bitmask = 0x80; + u8 bitshift = 7; + u8 array_index = 0; + int number_of_bits = num_nibbles * 4; + u8 remainder = 0; + + while (number_of_bits != 0) { + number_of_bits--; + remainder <<= 1; + remainder |= (data[array_index] & bitmask) >> bitshift; + bitmask >>= 1; + bitshift--; + if (bitmask == 0) { + bitmask = 0x80; + bitshift = 7; + array_index++; + } + if ((remainder & 0x10) == 0x10) + remainder ^= 0x13; + } + + number_of_bits = 4; + while (number_of_bits != 0) { + number_of_bits--; + remainder <<= 1; + if ((remainder & 0x10) != 0) + remainder ^= 0x13; + } + + return remainder; +} + +static u8 drm_dp_msg_data_crc4(const uint8_t *data, u8 number_of_bytes) +{ + u8 bitmask = 0x80; + u8 bitshift = 7; + u8 array_index = 0; + int number_of_bits = number_of_bytes * 8; + u16 remainder = 0; + + while (number_of_bits != 0) { + number_of_bits--; + remainder <<= 1; + remainder |= (data[array_index] & bitmask) >> bitshift; + bitmask >>= 1; + bitshift--; + if (bitmask == 0) { + bitmask = 0x80; + bitshift = 7; + array_index++; + } + if ((remainder & 0x100) == 0x100) + remainder ^= 0xd5; + } + + number_of_bits = 8; + while (number_of_bits != 0) { + number_of_bits--; + remainder <<= 1; + if ((remainder & 0x100) != 0) + remainder ^= 0xd5; + } + + return remainder & 0xff; +} +static inline u8 drm_dp_calc_sb_hdr_size(struct drm_dp_sideband_msg_hdr *hdr) +{ + u8 size = 3; + size += (hdr->lct / 2); + return size; +} + +static void drm_dp_encode_sideband_msg_hdr(struct drm_dp_sideband_msg_hdr *hdr, + u8 *buf, int *len) +{ + int idx = 0; + int i; + u8 crc4; + buf[idx++] = ((hdr->lct & 0xf) << 4) | (hdr->lcr & 0xf); + for (i = 0; i < (hdr->lct / 2); i++) + buf[idx++] = hdr->rad[i]; + buf[idx++] = (hdr->broadcast << 7) | (hdr->path_msg << 6) | + (hdr->msg_len & 0x3f); + buf[idx++] = (hdr->somt << 7) | (hdr->eomt << 6) | (hdr->seqno << 4); + + crc4 = drm_dp_msg_header_crc4(buf, (idx * 2) - 1); + buf[idx - 1] |= (crc4 & 0xf); + + *len = idx; +} + +static bool drm_dp_decode_sideband_msg_hdr(struct drm_dp_sideband_msg_hdr *hdr, + u8 *buf, int buflen, u8 *hdrlen) +{ + u8 crc4; + u8 len; + int i; + u8 idx; + if (buf[0] == 0) + return false; + len = 3; + len += ((buf[0] & 0xf0) >> 4) / 2; + if (len > buflen) + return false; + crc4 = drm_dp_msg_header_crc4(buf, (len * 2) - 1); + + if ((crc4 & 0xf) != (buf[len - 1] & 0xf)) { + DRM_DEBUG_KMS("crc4 mismatch 0x%x 0x%x\n", crc4, buf[len - 1]); + return false; + } + + hdr->lct = (buf[0] & 0xf0) >> 4; + hdr->lcr = (buf[0] & 0xf); + idx = 1; + for (i = 0; i < (hdr->lct / 2); i++) + hdr->rad[i] = buf[idx++]; + hdr->broadcast = (buf[idx] >> 7) & 0x1; + hdr->path_msg = (buf[idx] >> 6) & 0x1; + hdr->msg_len = buf[idx] & 0x3f; + idx++; + hdr->somt = (buf[idx] >> 7) & 0x1; + hdr->eomt = (buf[idx] >> 6) & 0x1; + hdr->seqno = (buf[idx] >> 4) & 0x1; + idx++; + *hdrlen = idx; + return true; +} + +static void drm_dp_encode_sideband_req(struct drm_dp_sideband_msg_req_body *req, + struct drm_dp_sideband_msg_tx *raw) +{ + int idx = 0; + int i; + u8 *buf = raw->msg; + buf[idx++] = req->req_type & 0x7f; + + switch (req->req_type) { + case DP_ENUM_PATH_RESOURCES: + buf[idx] = (req->u.port_num.port_number & 0xf) << 4; + idx++; + break; + case DP_ALLOCATE_PAYLOAD: + buf[idx] = (req->u.allocate_payload.port_number & 0xf) << 4 | + (req->u.allocate_payload.number_sdp_streams & 0xf); + idx++; + buf[idx] = (req->u.allocate_payload.vcpi & 0x7f); + idx++; + buf[idx] = (req->u.allocate_payload.pbn >> 8); + idx++; + buf[idx] = (req->u.allocate_payload.pbn & 0xff); + idx++; + for (i = 0; i < req->u.allocate_payload.number_sdp_streams / 2; i++) { + buf[idx] = ((req->u.allocate_payload.sdp_stream_sink[i * 2] & 0xf) << 4) | + (req->u.allocate_payload.sdp_stream_sink[i * 2 + 1] & 0xf); + idx++; + } + if (req->u.allocate_payload.number_sdp_streams & 1) { + i = req->u.allocate_payload.number_sdp_streams - 1; + buf[idx] = (req->u.allocate_payload.sdp_stream_sink[i] & 0xf) << 4; + idx++; + } + break; + case DP_QUERY_PAYLOAD: + buf[idx] = (req->u.query_payload.port_number & 0xf) << 4; + idx++; + buf[idx] = (req->u.query_payload.vcpi & 0x7f); + idx++; + break; + case DP_REMOTE_DPCD_READ: + buf[idx] = (req->u.dpcd_read.port_number & 0xf) << 4; + buf[idx] |= ((req->u.dpcd_read.dpcd_address & 0xf0000) >> 16) & 0xf; + idx++; + buf[idx] = (req->u.dpcd_read.dpcd_address & 0xff00) >> 8; + idx++; + buf[idx] = (req->u.dpcd_read.dpcd_address & 0xff); + idx++; + buf[idx] = (req->u.dpcd_read.num_bytes); + idx++; + break; + + case DP_REMOTE_DPCD_WRITE: + buf[idx] = (req->u.dpcd_write.port_number & 0xf) << 4; + buf[idx] |= ((req->u.dpcd_write.dpcd_address & 0xf0000) >> 16) & 0xf; + idx++; + buf[idx] = (req->u.dpcd_write.dpcd_address & 0xff00) >> 8; + idx++; + buf[idx] = (req->u.dpcd_write.dpcd_address & 0xff); + idx++; + buf[idx] = (req->u.dpcd_write.num_bytes); + idx++; + memcpy(&buf[idx], req->u.dpcd_write.bytes, req->u.dpcd_write.num_bytes); + idx += req->u.dpcd_write.num_bytes; + break; + case DP_REMOTE_I2C_READ: + buf[idx] = (req->u.i2c_read.port_number & 0xf) << 4; + buf[idx] |= (req->u.i2c_read.num_transactions & 0x3); + idx++; + for (i = 0; i < (req->u.i2c_read.num_transactions & 0x3); i++) { + buf[idx] = req->u.i2c_read.transactions[i].i2c_dev_id & 0x7f; + idx++; + buf[idx] = req->u.i2c_read.transactions[i].num_bytes; + idx++; + memcpy(&buf[idx], req->u.i2c_read.transactions[i].bytes, req->u.i2c_read.transactions[i].num_bytes); + idx += req->u.i2c_read.transactions[i].num_bytes; + + buf[idx] = (req->u.i2c_read.transactions[i].no_stop_bit & 0x1) << 5; + buf[idx] |= (req->u.i2c_read.transactions[i].i2c_transaction_delay & 0xf); + idx++; + } + buf[idx] = (req->u.i2c_read.read_i2c_device_id) & 0x7f; + idx++; + buf[idx] = (req->u.i2c_read.num_bytes_read); + idx++; + break; + + case DP_REMOTE_I2C_WRITE: + buf[idx] = (req->u.i2c_write.port_number & 0xf) << 4; + idx++; + buf[idx] = (req->u.i2c_write.write_i2c_device_id) & 0x7f; + idx++; + buf[idx] = (req->u.i2c_write.num_bytes); + idx++; + memcpy(&buf[idx], req->u.i2c_write.bytes, req->u.i2c_write.num_bytes); + idx += req->u.i2c_write.num_bytes; + break; + } + raw->cur_len = idx; +} + +static void drm_dp_crc_sideband_chunk_req(u8 *msg, u8 len) +{ + u8 crc4; + crc4 = drm_dp_msg_data_crc4(msg, len); + msg[len] = crc4; +} + +static void drm_dp_encode_sideband_reply(struct drm_dp_sideband_msg_reply_body *rep, + struct drm_dp_sideband_msg_tx *raw) +{ + int idx = 0; + u8 *buf = raw->msg; + + buf[idx++] = (rep->reply_type & 0x1) << 7 | (rep->req_type & 0x7f); + + raw->cur_len = idx; +} + +/* this adds a chunk of msg to the builder to get the final msg */ +static bool drm_dp_sideband_msg_build(struct drm_dp_sideband_msg_rx *msg, + u8 *replybuf, u8 replybuflen, bool hdr) +{ + int ret; + u8 crc4; + + if (hdr) { + u8 hdrlen; + struct drm_dp_sideband_msg_hdr recv_hdr; + ret = drm_dp_decode_sideband_msg_hdr(&recv_hdr, replybuf, replybuflen, &hdrlen); + if (ret == false) { + print_hex_dump(KERN_DEBUG, "failed hdr", DUMP_PREFIX_NONE, 16, 1, replybuf, replybuflen, false); + return false; + } + + /* get length contained in this portion */ + msg->curchunk_len = recv_hdr.msg_len; + msg->curchunk_hdrlen = hdrlen; + + /* we have already gotten an somt - don't bother parsing */ + if (recv_hdr.somt && msg->have_somt) + return false; + + if (recv_hdr.somt) { + memcpy(&msg->initial_hdr, &recv_hdr, sizeof(struct drm_dp_sideband_msg_hdr)); + msg->have_somt = true; + } + if (recv_hdr.eomt) + msg->have_eomt = true; + + /* copy the bytes for the remainder of this header chunk */ + msg->curchunk_idx = min(msg->curchunk_len, (u8)(replybuflen - hdrlen)); + memcpy(&msg->chunk[0], replybuf + hdrlen, msg->curchunk_idx); + } else { + memcpy(&msg->chunk[msg->curchunk_idx], replybuf, replybuflen); + msg->curchunk_idx += replybuflen; + } + + if (msg->curchunk_idx >= msg->curchunk_len) { + /* do CRC */ + crc4 = drm_dp_msg_data_crc4(msg->chunk, msg->curchunk_len - 1); + /* copy chunk into bigger msg */ + memcpy(&msg->msg[msg->curlen], msg->chunk, msg->curchunk_len - 1); + msg->curlen += msg->curchunk_len - 1; + } + return true; +} + +static bool drm_dp_sideband_parse_link_address(struct drm_dp_sideband_msg_rx *raw, + struct drm_dp_sideband_msg_reply_body *repmsg) +{ + int idx = 1; + int i; + memcpy(repmsg->u.link_addr.guid, &raw->msg[idx], 16); + idx += 16; + repmsg->u.link_addr.nports = raw->msg[idx] & 0xf; + idx++; + if (idx > raw->curlen) + goto fail_len; + for (i = 0; i < repmsg->u.link_addr.nports; i++) { + if (raw->msg[idx] & 0x80) + repmsg->u.link_addr.ports[i].input_port = 1; + + repmsg->u.link_addr.ports[i].peer_device_type = (raw->msg[idx] >> 4) & 0x7; + repmsg->u.link_addr.ports[i].port_number = (raw->msg[idx] & 0xf); + + idx++; + if (idx > raw->curlen) + goto fail_len; + repmsg->u.link_addr.ports[i].mcs = (raw->msg[idx] >> 7) & 0x1; + repmsg->u.link_addr.ports[i].ddps = (raw->msg[idx] >> 6) & 0x1; + if (repmsg->u.link_addr.ports[i].input_port == 0) + repmsg->u.link_addr.ports[i].legacy_device_plug_status = (raw->msg[idx] >> 5) & 0x1; + idx++; + if (idx > raw->curlen) + goto fail_len; + if (repmsg->u.link_addr.ports[i].input_port == 0) { + repmsg->u.link_addr.ports[i].dpcd_revision = (raw->msg[idx]); + idx++; + if (idx > raw->curlen) + goto fail_len; + memcpy(repmsg->u.link_addr.ports[i].peer_guid, &raw->msg[idx], 16); + idx += 16; + if (idx > raw->curlen) + goto fail_len; + repmsg->u.link_addr.ports[i].num_sdp_streams = (raw->msg[idx] >> 4) & 0xf; + repmsg->u.link_addr.ports[i].num_sdp_stream_sinks = (raw->msg[idx] & 0xf); + idx++; + + } + if (idx > raw->curlen) + goto fail_len; + } + + return true; +fail_len: + DRM_DEBUG_KMS("link address reply parse length fail %d %d\n", idx, raw->curlen); + return false; +} + +static bool drm_dp_sideband_parse_remote_dpcd_read(struct drm_dp_sideband_msg_rx *raw, + struct drm_dp_sideband_msg_reply_body *repmsg) +{ + int idx = 1; + repmsg->u.remote_dpcd_read_ack.port_number = raw->msg[idx] & 0xf; + idx++; + if (idx > raw->curlen) + goto fail_len; + repmsg->u.remote_dpcd_read_ack.num_bytes = raw->msg[idx]; + if (idx > raw->curlen) + goto fail_len; + + memcpy(repmsg->u.remote_dpcd_read_ack.bytes, &raw->msg[idx], repmsg->u.remote_dpcd_read_ack.num_bytes); + return true; +fail_len: + DRM_DEBUG_KMS("link address reply parse length fail %d %d\n", idx, raw->curlen); + return false; +} + +static bool drm_dp_sideband_parse_remote_dpcd_write(struct drm_dp_sideband_msg_rx *raw, + struct drm_dp_sideband_msg_reply_body *repmsg) +{ + int idx = 1; + repmsg->u.remote_dpcd_write_ack.port_number = raw->msg[idx] & 0xf; + idx++; + if (idx > raw->curlen) + goto fail_len; + return true; +fail_len: + DRM_DEBUG_KMS("parse length fail %d %d\n", idx, raw->curlen); + return false; +} + +static bool drm_dp_sideband_parse_remote_i2c_read_ack(struct drm_dp_sideband_msg_rx *raw, + struct drm_dp_sideband_msg_reply_body *repmsg) +{ + int idx = 1; + + repmsg->u.remote_i2c_read_ack.port_number = (raw->msg[idx] & 0xf); + idx++; + if (idx > raw->curlen) + goto fail_len; + repmsg->u.remote_i2c_read_ack.num_bytes = raw->msg[idx]; + idx++; + /* TODO check */ + memcpy(repmsg->u.remote_i2c_read_ack.bytes, &raw->msg[idx], repmsg->u.remote_i2c_read_ack.num_bytes); + return true; +fail_len: + DRM_DEBUG_KMS("remote i2c reply parse length fail %d %d\n", idx, raw->curlen); + return false; +} + +static bool drm_dp_sideband_parse_enum_path_resources_ack(struct drm_dp_sideband_msg_rx *raw, + struct drm_dp_sideband_msg_reply_body *repmsg) +{ + int idx = 1; + repmsg->u.path_resources.port_number = (raw->msg[idx] >> 4) & 0xf; + idx++; + if (idx > raw->curlen) + goto fail_len; + repmsg->u.path_resources.full_payload_bw_number = (raw->msg[idx] << 8) | (raw->msg[idx+1]); + idx += 2; + if (idx > raw->curlen) + goto fail_len; + repmsg->u.path_resources.avail_payload_bw_number = (raw->msg[idx] << 8) | (raw->msg[idx+1]); + idx += 2; + if (idx > raw->curlen) + goto fail_len; + return true; +fail_len: + DRM_DEBUG_KMS("enum resource parse length fail %d %d\n", idx, raw->curlen); + return false; +} + +static bool drm_dp_sideband_parse_allocate_payload_ack(struct drm_dp_sideband_msg_rx *raw, + struct drm_dp_sideband_msg_reply_body *repmsg) +{ + int idx = 1; + repmsg->u.allocate_payload.port_number = (raw->msg[idx] >> 4) & 0xf; + idx++; + if (idx > raw->curlen) + goto fail_len; + repmsg->u.allocate_payload.vcpi = raw->msg[idx]; + idx++; + if (idx > raw->curlen) + goto fail_len; + repmsg->u.allocate_payload.allocated_pbn = (raw->msg[idx] << 8) | (raw->msg[idx+1]); + idx += 2; + if (idx > raw->curlen) + goto fail_len; + return true; +fail_len: + DRM_DEBUG_KMS("allocate payload parse length fail %d %d\n", idx, raw->curlen); + return false; +} + +static bool drm_dp_sideband_parse_query_payload_ack(struct drm_dp_sideband_msg_rx *raw, + struct drm_dp_sideband_msg_reply_body *repmsg) +{ + int idx = 1; + repmsg->u.query_payload.port_number = (raw->msg[idx] >> 4) & 0xf; + idx++; + if (idx > raw->curlen) + goto fail_len; + repmsg->u.query_payload.allocated_pbn = (raw->msg[idx] << 8) | (raw->msg[idx + 1]); + idx += 2; + if (idx > raw->curlen) + goto fail_len; + return true; +fail_len: + DRM_DEBUG_KMS("query payload parse length fail %d %d\n", idx, raw->curlen); + return false; +} + +static bool drm_dp_sideband_parse_reply(struct drm_dp_sideband_msg_rx *raw, + struct drm_dp_sideband_msg_reply_body *msg) +{ + memset(msg, 0, sizeof(*msg)); + msg->reply_type = (raw->msg[0] & 0x80) >> 7; + msg->req_type = (raw->msg[0] & 0x7f); + + if (msg->reply_type) { + memcpy(msg->u.nak.guid, &raw->msg[1], 16); + msg->u.nak.reason = raw->msg[17]; + msg->u.nak.nak_data = raw->msg[18]; + return false; + } + + switch (msg->req_type) { + case DP_LINK_ADDRESS: + return drm_dp_sideband_parse_link_address(raw, msg); + case DP_QUERY_PAYLOAD: + return drm_dp_sideband_parse_query_payload_ack(raw, msg); + case DP_REMOTE_DPCD_READ: + return drm_dp_sideband_parse_remote_dpcd_read(raw, msg); + case DP_REMOTE_DPCD_WRITE: + return drm_dp_sideband_parse_remote_dpcd_write(raw, msg); + case DP_REMOTE_I2C_READ: + return drm_dp_sideband_parse_remote_i2c_read_ack(raw, msg); + case DP_ENUM_PATH_RESOURCES: + return drm_dp_sideband_parse_enum_path_resources_ack(raw, msg); + case DP_ALLOCATE_PAYLOAD: + return drm_dp_sideband_parse_allocate_payload_ack(raw, msg); + default: + DRM_ERROR("Got unknown reply 0x%02x\n", msg->req_type); + return false; + } +} + +static bool drm_dp_sideband_parse_connection_status_notify(struct drm_dp_sideband_msg_rx *raw, + struct drm_dp_sideband_msg_req_body *msg) +{ + int idx = 1; + + msg->u.conn_stat.port_number = (raw->msg[idx] & 0xf0) >> 4; + idx++; + if (idx > raw->curlen) + goto fail_len; + + memcpy(msg->u.conn_stat.guid, &raw->msg[idx], 16); + idx += 16; + if (idx > raw->curlen) + goto fail_len; + + msg->u.conn_stat.legacy_device_plug_status = (raw->msg[idx] >> 6) & 0x1; + msg->u.conn_stat.displayport_device_plug_status = (raw->msg[idx] >> 5) & 0x1; + msg->u.conn_stat.message_capability_status = (raw->msg[idx] >> 4) & 0x1; + msg->u.conn_stat.input_port = (raw->msg[idx] >> 3) & 0x1; + msg->u.conn_stat.peer_device_type = (raw->msg[idx] & 0x7); + idx++; + return true; +fail_len: + DRM_DEBUG_KMS("connection status reply parse length fail %d %d\n", idx, raw->curlen); + return false; +} + +static bool drm_dp_sideband_parse_resource_status_notify(struct drm_dp_sideband_msg_rx *raw, + struct drm_dp_sideband_msg_req_body *msg) +{ + int idx = 1; + + msg->u.resource_stat.port_number = (raw->msg[idx] & 0xf0) >> 4; + idx++; + if (idx > raw->curlen) + goto fail_len; + + memcpy(msg->u.resource_stat.guid, &raw->msg[idx], 16); + idx += 16; + if (idx > raw->curlen) + goto fail_len; + + msg->u.resource_stat.available_pbn = (raw->msg[idx] << 8) | (raw->msg[idx + 1]); + idx++; + return true; +fail_len: + DRM_DEBUG_KMS("resource status reply parse length fail %d %d\n", idx, raw->curlen); + return false; +} + +static bool drm_dp_sideband_parse_req(struct drm_dp_sideband_msg_rx *raw, + struct drm_dp_sideband_msg_req_body *msg) +{ + memset(msg, 0, sizeof(*msg)); + msg->req_type = (raw->msg[0] & 0x7f); + + switch (msg->req_type) { + case DP_CONNECTION_STATUS_NOTIFY: + return drm_dp_sideband_parse_connection_status_notify(raw, msg); + case DP_RESOURCE_STATUS_NOTIFY: + return drm_dp_sideband_parse_resource_status_notify(raw, msg); + default: + DRM_ERROR("Got unknown request 0x%02x\n", msg->req_type); + return false; + } +} + +static int build_dpcd_write(struct drm_dp_sideband_msg_tx *msg, u8 port_num, u32 offset, u8 num_bytes, u8 *bytes) +{ + struct drm_dp_sideband_msg_req_body req; + + req.req_type = DP_REMOTE_DPCD_WRITE; + req.u.dpcd_write.port_number = port_num; + req.u.dpcd_write.dpcd_address = offset; + req.u.dpcd_write.num_bytes = num_bytes; + memcpy(req.u.dpcd_write.bytes, bytes, num_bytes); + drm_dp_encode_sideband_req(&req, msg); + + return 0; +} + +static int build_link_address(struct drm_dp_sideband_msg_tx *msg) +{ + struct drm_dp_sideband_msg_req_body req; + + req.req_type = DP_LINK_ADDRESS; + drm_dp_encode_sideband_req(&req, msg); + return 0; +} + +static int build_enum_path_resources(struct drm_dp_sideband_msg_tx *msg, int port_num) +{ + struct drm_dp_sideband_msg_req_body req; + + req.req_type = DP_ENUM_PATH_RESOURCES; + req.u.port_num.port_number = port_num; + drm_dp_encode_sideband_req(&req, msg); + msg->path_msg = true; + return 0; +} + +static int build_allocate_payload(struct drm_dp_sideband_msg_tx *msg, int port_num, + u8 vcpi, uint16_t pbn) +{ + struct drm_dp_sideband_msg_req_body req; + memset(&req, 0, sizeof(req)); + req.req_type = DP_ALLOCATE_PAYLOAD; + req.u.allocate_payload.port_number = port_num; + req.u.allocate_payload.vcpi = vcpi; + req.u.allocate_payload.pbn = pbn; + drm_dp_encode_sideband_req(&req, msg); + msg->path_msg = true; + return 0; +} + +static int drm_dp_mst_assign_payload_id(struct drm_dp_mst_topology_mgr *mgr, + struct drm_dp_vcpi *vcpi) +{ + int ret; + + mutex_lock(&mgr->payload_lock); + ret = find_first_zero_bit(&mgr->payload_mask, mgr->max_payloads + 1); + if (ret > mgr->max_payloads) { + ret = -EINVAL; + DRM_DEBUG_KMS("out of payload ids %d\n", ret); + goto out_unlock; + } + + set_bit(ret, &mgr->payload_mask); + vcpi->vcpi = ret; + mgr->proposed_vcpis[ret - 1] = vcpi; +out_unlock: + mutex_unlock(&mgr->payload_lock); + return ret; +} + +static void drm_dp_mst_put_payload_id(struct drm_dp_mst_topology_mgr *mgr, + int id) +{ + if (id == 0) + return; + + mutex_lock(&mgr->payload_lock); + DRM_DEBUG_KMS("putting payload %d\n", id); + clear_bit(id, &mgr->payload_mask); + mgr->proposed_vcpis[id - 1] = NULL; + mutex_unlock(&mgr->payload_lock); +} + +static bool check_txmsg_state(struct drm_dp_mst_topology_mgr *mgr, + struct drm_dp_sideband_msg_tx *txmsg) +{ + bool ret; + mutex_lock(&mgr->qlock); + ret = (txmsg->state == DRM_DP_SIDEBAND_TX_RX || + txmsg->state == DRM_DP_SIDEBAND_TX_TIMEOUT); + mutex_unlock(&mgr->qlock); + return ret; +} + +static int drm_dp_mst_wait_tx_reply(struct drm_dp_mst_branch *mstb, + struct drm_dp_sideband_msg_tx *txmsg) +{ + struct drm_dp_mst_topology_mgr *mgr = mstb->mgr; + int ret; + + ret = wait_event_timeout(mgr->tx_waitq, + check_txmsg_state(mgr, txmsg), + (4 * HZ)); + mutex_lock(&mstb->mgr->qlock); + if (ret > 0) { + if (txmsg->state == DRM_DP_SIDEBAND_TX_TIMEOUT) { + ret = -EIO; + goto out; + } + } else { + DRM_DEBUG_KMS("timedout msg send %p %d %d\n", txmsg, txmsg->state, txmsg->seqno); + + /* dump some state */ + ret = -EIO; + + /* remove from q */ + if (txmsg->state == DRM_DP_SIDEBAND_TX_QUEUED || + txmsg->state == DRM_DP_SIDEBAND_TX_START_SEND) { + list_del(&txmsg->next); + } + + if (txmsg->state == DRM_DP_SIDEBAND_TX_START_SEND || + txmsg->state == DRM_DP_SIDEBAND_TX_SENT) { + mstb->tx_slots[txmsg->seqno] = NULL; + } + } +out: + mutex_unlock(&mgr->qlock); + + return ret; +} + +static struct drm_dp_mst_branch *drm_dp_add_mst_branch_device(u8 lct, u8 *rad) +{ + struct drm_dp_mst_branch *mstb; + + mstb = kzalloc(sizeof(*mstb), GFP_KERNEL); + if (!mstb) + return NULL; + + mstb->lct = lct; + if (lct > 1) + memcpy(mstb->rad, rad, lct / 2); + INIT_LIST_HEAD(&mstb->ports); + kref_init(&mstb->kref); + return mstb; +} + +static void drm_dp_destroy_mst_branch_device(struct kref *kref) +{ + struct drm_dp_mst_branch *mstb = container_of(kref, struct drm_dp_mst_branch, kref); + struct drm_dp_mst_port *port, *tmp; + bool wake_tx = false; + + cancel_work_sync(&mstb->mgr->work); + + /* + * destroy all ports - don't need lock + * as there are no more references to the mst branch + * device at this point. + */ + list_for_each_entry_safe(port, tmp, &mstb->ports, next) { + list_del(&port->next); + drm_dp_put_port(port); + } + + /* drop any tx slots msg */ + mutex_lock(&mstb->mgr->qlock); + if (mstb->tx_slots[0]) { + mstb->tx_slots[0]->state = DRM_DP_SIDEBAND_TX_TIMEOUT; + mstb->tx_slots[0] = NULL; + wake_tx = true; + } + if (mstb->tx_slots[1]) { + mstb->tx_slots[1]->state = DRM_DP_SIDEBAND_TX_TIMEOUT; + mstb->tx_slots[1] = NULL; + wake_tx = true; + } + mutex_unlock(&mstb->mgr->qlock); + + if (wake_tx) + wake_up(&mstb->mgr->tx_waitq); + kfree(mstb); +} + +static void drm_dp_put_mst_branch_device(struct drm_dp_mst_branch *mstb) +{ + kref_put(&mstb->kref, drm_dp_destroy_mst_branch_device); +} + + +static void drm_dp_port_teardown_pdt(struct drm_dp_mst_port *port, int old_pdt) +{ + switch (old_pdt) { + case DP_PEER_DEVICE_DP_LEGACY_CONV: + case DP_PEER_DEVICE_SST_SINK: + /* remove i2c over sideband */ + drm_dp_mst_unregister_i2c_bus(&port->aux); + break; + case DP_PEER_DEVICE_MST_BRANCHING: + drm_dp_put_mst_branch_device(port->mstb); + port->mstb = NULL; + break; + } +} + +static void drm_dp_destroy_port(struct kref *kref) +{ + struct drm_dp_mst_port *port = container_of(kref, struct drm_dp_mst_port, kref); + struct drm_dp_mst_topology_mgr *mgr = port->mgr; + if (!port->input) { + port->vcpi.num_slots = 0; + if (port->connector) + (*port->mgr->cbs->destroy_connector)(mgr, port->connector); + drm_dp_port_teardown_pdt(port, port->pdt); + + if (!port->input && port->vcpi.vcpi > 0) + drm_dp_mst_put_payload_id(mgr, port->vcpi.vcpi); + } + kfree(port); +} + +static void drm_dp_put_port(struct drm_dp_mst_port *port) +{ + kref_put(&port->kref, drm_dp_destroy_port); +} + +static struct drm_dp_mst_branch *drm_dp_mst_get_validated_mstb_ref_locked(struct drm_dp_mst_branch *mstb, struct drm_dp_mst_branch *to_find) +{ + struct drm_dp_mst_port *port; + struct drm_dp_mst_branch *rmstb; + if (to_find == mstb) { + kref_get(&mstb->kref); + return mstb; + } + list_for_each_entry(port, &mstb->ports, next) { + if (port->mstb) { + rmstb = drm_dp_mst_get_validated_mstb_ref_locked(port->mstb, to_find); + if (rmstb) + return rmstb; + } + } + return NULL; +} + +static struct drm_dp_mst_branch *drm_dp_get_validated_mstb_ref(struct drm_dp_mst_topology_mgr *mgr, struct drm_dp_mst_branch *mstb) +{ + struct drm_dp_mst_branch *rmstb = NULL; + mutex_lock(&mgr->lock); + if (mgr->mst_primary) + rmstb = drm_dp_mst_get_validated_mstb_ref_locked(mgr->mst_primary, mstb); + mutex_unlock(&mgr->lock); + return rmstb; +} + +static struct drm_dp_mst_port *drm_dp_mst_get_port_ref_locked(struct drm_dp_mst_branch *mstb, struct drm_dp_mst_port *to_find) +{ + struct drm_dp_mst_port *port, *mport; + + list_for_each_entry(port, &mstb->ports, next) { + if (port == to_find) { + kref_get(&port->kref); + return port; + } + if (port->mstb) { + mport = drm_dp_mst_get_port_ref_locked(port->mstb, to_find); + if (mport) + return mport; + } + } + return NULL; +} + +static struct drm_dp_mst_port *drm_dp_get_validated_port_ref(struct drm_dp_mst_topology_mgr *mgr, struct drm_dp_mst_port *port) +{ + struct drm_dp_mst_port *rport = NULL; + mutex_lock(&mgr->lock); + if (mgr->mst_primary) + rport = drm_dp_mst_get_port_ref_locked(mgr->mst_primary, port); + mutex_unlock(&mgr->lock); + return rport; +} + +static struct drm_dp_mst_port *drm_dp_get_port(struct drm_dp_mst_branch *mstb, u8 port_num) +{ + struct drm_dp_mst_port *port; + + list_for_each_entry(port, &mstb->ports, next) { + if (port->port_num == port_num) { + kref_get(&port->kref); + return port; + } + } + + return NULL; +} + +/* + * calculate a new RAD for this MST branch device + * if parent has an LCT of 2 then it has 1 nibble of RAD, + * if parent has an LCT of 3 then it has 2 nibbles of RAD, + */ +static u8 drm_dp_calculate_rad(struct drm_dp_mst_port *port, + u8 *rad) +{ + int lct = port->parent->lct; + int shift = 4; + int idx = lct / 2; + if (lct > 1) { + memcpy(rad, port->parent->rad, idx); + shift = (lct % 2) ? 4 : 0; + } else + rad[0] = 0; + + rad[idx] |= port->port_num << shift; + return lct + 1; +} + +/* + * return sends link address for new mstb + */ +static bool drm_dp_port_setup_pdt(struct drm_dp_mst_port *port) +{ + int ret; + u8 rad[6], lct; + bool send_link = false; + switch (port->pdt) { + case DP_PEER_DEVICE_DP_LEGACY_CONV: + case DP_PEER_DEVICE_SST_SINK: + /* add i2c over sideband */ + ret = drm_dp_mst_register_i2c_bus(&port->aux); + break; + case DP_PEER_DEVICE_MST_BRANCHING: + lct = drm_dp_calculate_rad(port, rad); + + port->mstb = drm_dp_add_mst_branch_device(lct, rad); + port->mstb->mgr = port->mgr; + port->mstb->port_parent = port; + + send_link = true; + break; + } + return send_link; +} + +static void drm_dp_check_port_guid(struct drm_dp_mst_branch *mstb, + struct drm_dp_mst_port *port) +{ + int ret; + if (port->dpcd_rev >= 0x12) { + port->guid_valid = drm_dp_validate_guid(mstb->mgr, port->guid); + if (!port->guid_valid) { + ret = drm_dp_send_dpcd_write(mstb->mgr, + port, + DP_GUID, + 16, port->guid); + port->guid_valid = true; + } + } +} + +static void build_mst_prop_path(struct drm_dp_mst_port *port, + struct drm_dp_mst_branch *mstb, + char *proppath) +{ + int i; + char temp[8]; + snprintf(proppath, 255, "mst:%d", mstb->mgr->conn_base_id); + for (i = 0; i < (mstb->lct - 1); i++) { + int shift = (i % 2) ? 0 : 4; + int port_num = mstb->rad[i / 2] >> shift; + snprintf(temp, 8, "-%d", port_num); + strncat(proppath, temp, 255); + } + snprintf(temp, 8, "-%d", port->port_num); + strncat(proppath, temp, 255); +} + +static void drm_dp_add_port(struct drm_dp_mst_branch *mstb, + struct device *dev, + struct drm_dp_link_addr_reply_port *port_msg) +{ + struct drm_dp_mst_port *port; + bool ret; + bool created = false; + int old_pdt = 0; + int old_ddps = 0; + port = drm_dp_get_port(mstb, port_msg->port_number); + if (!port) { + port = kzalloc(sizeof(*port), GFP_KERNEL); + if (!port) + return; + kref_init(&port->kref); + port->parent = mstb; + port->port_num = port_msg->port_number; + port->mgr = mstb->mgr; + port->aux.name = "DPMST"; + port->aux.dev = dev; + created = true; + } else { + old_pdt = port->pdt; + old_ddps = port->ddps; + } + + port->pdt = port_msg->peer_device_type; + port->input = port_msg->input_port; + port->mcs = port_msg->mcs; + port->ddps = port_msg->ddps; + port->ldps = port_msg->legacy_device_plug_status; + port->dpcd_rev = port_msg->dpcd_revision; + + memcpy(port->guid, port_msg->peer_guid, 16); + + /* manage mstb port lists with mgr lock - take a reference + for this list */ + if (created) { + mutex_lock(&mstb->mgr->lock); + kref_get(&port->kref); + list_add(&port->next, &mstb->ports); + mutex_unlock(&mstb->mgr->lock); + } + + if (old_ddps != port->ddps) { + if (port->ddps) { + drm_dp_check_port_guid(mstb, port); + if (!port->input) + drm_dp_send_enum_path_resources(mstb->mgr, mstb, port); + } else { + port->guid_valid = false; + port->available_pbn = 0; + } + } + + if (old_pdt != port->pdt && !port->input) { + drm_dp_port_teardown_pdt(port, old_pdt); + + ret = drm_dp_port_setup_pdt(port); + if (ret == true) { + drm_dp_send_link_address(mstb->mgr, port->mstb); + port->mstb->link_address_sent = true; + } + } + + if (created && !port->input) { + char proppath[255]; + build_mst_prop_path(port, mstb, proppath); + port->connector = (*mstb->mgr->cbs->add_connector)(mstb->mgr, port, proppath); + } + + /* put reference to this port */ + drm_dp_put_port(port); +} + +static void drm_dp_update_port(struct drm_dp_mst_branch *mstb, + struct drm_dp_connection_status_notify *conn_stat) +{ + struct drm_dp_mst_port *port; + int old_pdt; + int old_ddps; + bool dowork = false; + port = drm_dp_get_port(mstb, conn_stat->port_number); + if (!port) + return; + + old_ddps = port->ddps; + old_pdt = port->pdt; + port->pdt = conn_stat->peer_device_type; + port->mcs = conn_stat->message_capability_status; + port->ldps = conn_stat->legacy_device_plug_status; + port->ddps = conn_stat->displayport_device_plug_status; + + if (old_ddps != port->ddps) { + if (port->ddps) { + drm_dp_check_port_guid(mstb, port); + dowork = true; + } else { + port->guid_valid = false; + port->available_pbn = 0; + } + } + if (old_pdt != port->pdt && !port->input) { + drm_dp_port_teardown_pdt(port, old_pdt); + + if (drm_dp_port_setup_pdt(port)) + dowork = true; + } + + drm_dp_put_port(port); + if (dowork) + queue_work(system_long_wq, &mstb->mgr->work); + +} + +static struct drm_dp_mst_branch *drm_dp_get_mst_branch_device(struct drm_dp_mst_topology_mgr *mgr, + u8 lct, u8 *rad) +{ + struct drm_dp_mst_branch *mstb; + struct drm_dp_mst_port *port; + int i; + /* find the port by iterating down */ + mstb = mgr->mst_primary; + + for (i = 0; i < lct - 1; i++) { + int shift = (i % 2) ? 0 : 4; + int port_num = rad[i / 2] >> shift; + + list_for_each_entry(port, &mstb->ports, next) { + if (port->port_num == port_num) { + if (!port->mstb) { + DRM_ERROR("failed to lookup MSTB with lct %d, rad %02x\n", lct, rad[0]); + return NULL; + } + + mstb = port->mstb; + break; + } + } + } + kref_get(&mstb->kref); + return mstb; +} + +static void drm_dp_check_and_send_link_address(struct drm_dp_mst_topology_mgr *mgr, + struct drm_dp_mst_branch *mstb) +{ + struct drm_dp_mst_port *port; + + if (!mstb->link_address_sent) { + drm_dp_send_link_address(mgr, mstb); + mstb->link_address_sent = true; + } + list_for_each_entry(port, &mstb->ports, next) { + if (port->input) + continue; + + if (!port->ddps) + continue; + + if (!port->available_pbn) + drm_dp_send_enum_path_resources(mgr, mstb, port); + + if (port->mstb) + drm_dp_check_and_send_link_address(mgr, port->mstb); + } +} + +static void drm_dp_mst_link_probe_work(struct work_struct *work) +{ + struct drm_dp_mst_topology_mgr *mgr = container_of(work, struct drm_dp_mst_topology_mgr, work); + + drm_dp_check_and_send_link_address(mgr, mgr->mst_primary); + +} + +static bool drm_dp_validate_guid(struct drm_dp_mst_topology_mgr *mgr, + u8 *guid) +{ + static u8 zero_guid[16]; + + if (!memcmp(guid, zero_guid, 16)) { + u64 salt = get_jiffies_64(); + memcpy(&guid[0], &salt, sizeof(u64)); + memcpy(&guid[8], &salt, sizeof(u64)); + return false; + } + return true; +} + +#if 0 +static int build_dpcd_read(struct drm_dp_sideband_msg_tx *msg, u8 port_num, u32 offset, u8 num_bytes) +{ + struct drm_dp_sideband_msg_req_body req; + + req.req_type = DP_REMOTE_DPCD_READ; + req.u.dpcd_read.port_number = port_num; + req.u.dpcd_read.dpcd_address = offset; + req.u.dpcd_read.num_bytes = num_bytes; + drm_dp_encode_sideband_req(&req, msg); + + return 0; +} +#endif + +static int drm_dp_send_sideband_msg(struct drm_dp_mst_topology_mgr *mgr, + bool up, u8 *msg, int len) +{ + int ret; + int regbase = up ? DP_SIDEBAND_MSG_UP_REP_BASE : DP_SIDEBAND_MSG_DOWN_REQ_BASE; + int tosend, total, offset; + int retries = 0; + +retry: + total = len; + offset = 0; + do { + tosend = min3(mgr->max_dpcd_transaction_bytes, 16, total); + + mutex_lock(&mgr->aux_lock); + ret = drm_dp_dpcd_write(mgr->aux, regbase + offset, + &msg[offset], + tosend); + mutex_unlock(&mgr->aux_lock); + if (ret != tosend) { + if (ret == -EIO && retries < 5) { + retries++; + goto retry; + } + DRM_DEBUG_KMS("failed to dpcd write %d %d\n", tosend, ret); + WARN(1, "fail\n"); + + return -EIO; + } + offset += tosend; + total -= tosend; + } while (total > 0); + return 0; +} + +static int set_hdr_from_dst_qlock(struct drm_dp_sideband_msg_hdr *hdr, + struct drm_dp_sideband_msg_tx *txmsg) +{ + struct drm_dp_mst_branch *mstb = txmsg->dst; + + /* both msg slots are full */ + if (txmsg->seqno == -1) { + if (mstb->tx_slots[0] && mstb->tx_slots[1]) { + DRM_DEBUG_KMS("%s: failed to find slot\n", __func__); + return -EAGAIN; + } + if (mstb->tx_slots[0] == NULL && mstb->tx_slots[1] == NULL) { + txmsg->seqno = mstb->last_seqno; + mstb->last_seqno ^= 1; + } else if (mstb->tx_slots[0] == NULL) + txmsg->seqno = 0; + else + txmsg->seqno = 1; + mstb->tx_slots[txmsg->seqno] = txmsg; + } + hdr->broadcast = 0; + hdr->path_msg = txmsg->path_msg; + hdr->lct = mstb->lct; + hdr->lcr = mstb->lct - 1; + if (mstb->lct > 1) + memcpy(hdr->rad, mstb->rad, mstb->lct / 2); + hdr->seqno = txmsg->seqno; + return 0; +} +/* + * process a single block of the next message in the sideband queue + */ +static int process_single_tx_qlock(struct drm_dp_mst_topology_mgr *mgr, + struct drm_dp_sideband_msg_tx *txmsg, + bool up) +{ + u8 chunk[48]; + struct drm_dp_sideband_msg_hdr hdr; + int len, space, idx, tosend; + int ret; + + if (txmsg->state == DRM_DP_SIDEBAND_TX_QUEUED) { + txmsg->seqno = -1; + txmsg->state = DRM_DP_SIDEBAND_TX_START_SEND; + } + + /* make hdr from dst mst - for replies use seqno + otherwise assign one */ + ret = set_hdr_from_dst_qlock(&hdr, txmsg); + if (ret < 0) + return ret; + + /* amount left to send in this message */ + len = txmsg->cur_len - txmsg->cur_offset; + + /* 48 - sideband msg size - 1 byte for data CRC, x header bytes */ + space = 48 - 1 - drm_dp_calc_sb_hdr_size(&hdr); + + tosend = min(len, space); + if (len == txmsg->cur_len) + hdr.somt = 1; + if (space >= len) + hdr.eomt = 1; + + + hdr.msg_len = tosend + 1; + drm_dp_encode_sideband_msg_hdr(&hdr, chunk, &idx); + memcpy(&chunk[idx], &txmsg->msg[txmsg->cur_offset], tosend); + /* add crc at end */ + drm_dp_crc_sideband_chunk_req(&chunk[idx], tosend); + idx += tosend + 1; + + ret = drm_dp_send_sideband_msg(mgr, up, chunk, idx); + if (ret) { + DRM_DEBUG_KMS("sideband msg failed to send\n"); + return ret; + } + + txmsg->cur_offset += tosend; + if (txmsg->cur_offset == txmsg->cur_len) { + txmsg->state = DRM_DP_SIDEBAND_TX_SENT; + return 1; + } + return 0; +} + +/* must be called holding qlock */ +static void process_single_down_tx_qlock(struct drm_dp_mst_topology_mgr *mgr) +{ + struct drm_dp_sideband_msg_tx *txmsg; + int ret; + + /* construct a chunk from the first msg in the tx_msg queue */ + if (list_empty(&mgr->tx_msg_downq)) { + mgr->tx_down_in_progress = false; + return; + } + mgr->tx_down_in_progress = true; + + txmsg = list_first_entry(&mgr->tx_msg_downq, struct drm_dp_sideband_msg_tx, next); + ret = process_single_tx_qlock(mgr, txmsg, false); + if (ret == 1) { + /* txmsg is sent it should be in the slots now */ + list_del(&txmsg->next); + } else if (ret) { + DRM_DEBUG_KMS("failed to send msg in q %d\n", ret); + list_del(&txmsg->next); + if (txmsg->seqno != -1) + txmsg->dst->tx_slots[txmsg->seqno] = NULL; + txmsg->state = DRM_DP_SIDEBAND_TX_TIMEOUT; + wake_up(&mgr->tx_waitq); + } + if (list_empty(&mgr->tx_msg_downq)) { + mgr->tx_down_in_progress = false; + return; + } +} + +/* called holding qlock */ +static void process_single_up_tx_qlock(struct drm_dp_mst_topology_mgr *mgr) +{ + struct drm_dp_sideband_msg_tx *txmsg; + int ret; + + /* construct a chunk from the first msg in the tx_msg queue */ + if (list_empty(&mgr->tx_msg_upq)) { + mgr->tx_up_in_progress = false; + return; + } + + txmsg = list_first_entry(&mgr->tx_msg_upq, struct drm_dp_sideband_msg_tx, next); + ret = process_single_tx_qlock(mgr, txmsg, true); + if (ret == 1) { + /* up txmsgs aren't put in slots - so free after we send it */ + list_del(&txmsg->next); + kfree(txmsg); + } else if (ret) + DRM_DEBUG_KMS("failed to send msg in q %d\n", ret); + mgr->tx_up_in_progress = true; +} + +static void drm_dp_queue_down_tx(struct drm_dp_mst_topology_mgr *mgr, + struct drm_dp_sideband_msg_tx *txmsg) +{ + mutex_lock(&mgr->qlock); + list_add_tail(&txmsg->next, &mgr->tx_msg_downq); + if (!mgr->tx_down_in_progress) + process_single_down_tx_qlock(mgr); + mutex_unlock(&mgr->qlock); +} + +static int drm_dp_send_link_address(struct drm_dp_mst_topology_mgr *mgr, + struct drm_dp_mst_branch *mstb) +{ + int len; + struct drm_dp_sideband_msg_tx *txmsg; + int ret; + + txmsg = kzalloc(sizeof(*txmsg), GFP_KERNEL); + if (!txmsg) + return -ENOMEM; + + txmsg->dst = mstb; + len = build_link_address(txmsg); + + drm_dp_queue_down_tx(mgr, txmsg); + + ret = drm_dp_mst_wait_tx_reply(mstb, txmsg); + if (ret > 0) { + int i; + + if (txmsg->reply.reply_type == 1) + DRM_DEBUG_KMS("link address nak received\n"); + else { + DRM_DEBUG_KMS("link address reply: %d\n", txmsg->reply.u.link_addr.nports); + for (i = 0; i < txmsg->reply.u.link_addr.nports; i++) { + DRM_DEBUG_KMS("port %d: input %d, pdt: %d, pn: %d, dpcd_rev: %02x, mcs: %d, ddps: %d, ldps %d\n", i, + txmsg->reply.u.link_addr.ports[i].input_port, + txmsg->reply.u.link_addr.ports[i].peer_device_type, + txmsg->reply.u.link_addr.ports[i].port_number, + txmsg->reply.u.link_addr.ports[i].dpcd_revision, + txmsg->reply.u.link_addr.ports[i].mcs, + txmsg->reply.u.link_addr.ports[i].ddps, + txmsg->reply.u.link_addr.ports[i].legacy_device_plug_status); + } + for (i = 0; i < txmsg->reply.u.link_addr.nports; i++) { + drm_dp_add_port(mstb, mgr->dev, &txmsg->reply.u.link_addr.ports[i]); + } + (*mgr->cbs->hotplug)(mgr); + } + } else + DRM_DEBUG_KMS("link address failed %d\n", ret); + + kfree(txmsg); + return 0; +} + +static int drm_dp_send_enum_path_resources(struct drm_dp_mst_topology_mgr *mgr, + struct drm_dp_mst_branch *mstb, + struct drm_dp_mst_port *port) +{ + int len; + struct drm_dp_sideband_msg_tx *txmsg; + int ret; + + txmsg = kzalloc(sizeof(*txmsg), GFP_KERNEL); + if (!txmsg) + return -ENOMEM; + + txmsg->dst = mstb; + len = build_enum_path_resources(txmsg, port->port_num); + + drm_dp_queue_down_tx(mgr, txmsg); + + ret = drm_dp_mst_wait_tx_reply(mstb, txmsg); + if (ret > 0) { + if (txmsg->reply.reply_type == 1) + DRM_DEBUG_KMS("enum path resources nak received\n"); + else { + if (port->port_num != txmsg->reply.u.path_resources.port_number) + DRM_ERROR("got incorrect port in response\n"); + DRM_DEBUG_KMS("enum path resources %d: %d %d\n", txmsg->reply.u.path_resources.port_number, txmsg->reply.u.path_resources.full_payload_bw_number, + txmsg->reply.u.path_resources.avail_payload_bw_number); + port->available_pbn = txmsg->reply.u.path_resources.avail_payload_bw_number; + } + } + + kfree(txmsg); + return 0; +} + +int drm_dp_payload_send_msg(struct drm_dp_mst_topology_mgr *mgr, + struct drm_dp_mst_port *port, + int id, + int pbn) +{ + struct drm_dp_sideband_msg_tx *txmsg; + struct drm_dp_mst_branch *mstb; + int len, ret; + + mstb = drm_dp_get_validated_mstb_ref(mgr, port->parent); + if (!mstb) + return -EINVAL; + + txmsg = kzalloc(sizeof(*txmsg), GFP_KERNEL); + if (!txmsg) { + ret = -ENOMEM; + goto fail_put; + } + + txmsg->dst = mstb; + len = build_allocate_payload(txmsg, port->port_num, + id, + pbn); + + drm_dp_queue_down_tx(mgr, txmsg); + + ret = drm_dp_mst_wait_tx_reply(mstb, txmsg); + if (ret > 0) { + if (txmsg->reply.reply_type == 1) { + ret = -EINVAL; + } else + ret = 0; + } + kfree(txmsg); +fail_put: + drm_dp_put_mst_branch_device(mstb); + return ret; +} + +static int drm_dp_create_payload_step1(struct drm_dp_mst_topology_mgr *mgr, + int id, + struct drm_dp_payload *payload) +{ + int ret; + + ret = drm_dp_dpcd_write_payload(mgr, id, payload); + if (ret < 0) { + payload->payload_state = 0; + return ret; + } + payload->payload_state = DP_PAYLOAD_LOCAL; + return 0; +} + +int drm_dp_create_payload_step2(struct drm_dp_mst_topology_mgr *mgr, + struct drm_dp_mst_port *port, + int id, + struct drm_dp_payload *payload) +{ + int ret; + ret = drm_dp_payload_send_msg(mgr, port, id, port->vcpi.pbn); + if (ret < 0) + return ret; + payload->payload_state = DP_PAYLOAD_REMOTE; + return ret; +} + +int drm_dp_destroy_payload_step1(struct drm_dp_mst_topology_mgr *mgr, + struct drm_dp_mst_port *port, + int id, + struct drm_dp_payload *payload) +{ + DRM_DEBUG_KMS("\n"); + /* its okay for these to fail */ + if (port) { + drm_dp_payload_send_msg(mgr, port, id, 0); + } + + drm_dp_dpcd_write_payload(mgr, id, payload); + payload->payload_state = 0; + return 0; +} + +int drm_dp_destroy_payload_step2(struct drm_dp_mst_topology_mgr *mgr, + int id, + struct drm_dp_payload *payload) +{ + payload->payload_state = 0; + return 0; +} + +/** + * drm_dp_update_payload_part1() - Execute payload update part 1 + * @mgr: manager to use. + * + * This iterates over all proposed virtual channels, and tries to + * allocate space in the link for them. For 0->slots transitions, + * this step just writes the VCPI to the MST device. For slots->0 + * transitions, this writes the updated VCPIs and removes the + * remote VC payloads. + * + * after calling this the driver should generate ACT and payload + * packets. + */ +int drm_dp_update_payload_part1(struct drm_dp_mst_topology_mgr *mgr) +{ + int i; + int cur_slots = 1; + struct drm_dp_payload req_payload; + struct drm_dp_mst_port *port; + + mutex_lock(&mgr->payload_lock); + for (i = 0; i < mgr->max_payloads; i++) { + /* solve the current payloads - compare to the hw ones + - update the hw view */ + req_payload.start_slot = cur_slots; + if (mgr->proposed_vcpis[i]) { + port = container_of(mgr->proposed_vcpis[i], struct drm_dp_mst_port, vcpi); + req_payload.num_slots = mgr->proposed_vcpis[i]->num_slots; + } else { + port = NULL; + req_payload.num_slots = 0; + } + /* work out what is required to happen with this payload */ + if (mgr->payloads[i].start_slot != req_payload.start_slot || + mgr->payloads[i].num_slots != req_payload.num_slots) { + + /* need to push an update for this payload */ + if (req_payload.num_slots) { + drm_dp_create_payload_step1(mgr, i + 1, &req_payload); + mgr->payloads[i].num_slots = req_payload.num_slots; + } else if (mgr->payloads[i].num_slots) { + mgr->payloads[i].num_slots = 0; + drm_dp_destroy_payload_step1(mgr, port, i + 1, &mgr->payloads[i]); + req_payload.payload_state = mgr->payloads[i].payload_state; + } + mgr->payloads[i].start_slot = req_payload.start_slot; + mgr->payloads[i].payload_state = req_payload.payload_state; + } + cur_slots += req_payload.num_slots; + } + mutex_unlock(&mgr->payload_lock); + + return 0; +} +EXPORT_SYMBOL(drm_dp_update_payload_part1); + +/** + * drm_dp_update_payload_part2() - Execute payload update part 2 + * @mgr: manager to use. + * + * This iterates over all proposed virtual channels, and tries to + * allocate space in the link for them. For 0->slots transitions, + * this step writes the remote VC payload commands. For slots->0 + * this just resets some internal state. + */ +int drm_dp_update_payload_part2(struct drm_dp_mst_topology_mgr *mgr) +{ + struct drm_dp_mst_port *port; + int i; + int ret; + mutex_lock(&mgr->payload_lock); + for (i = 0; i < mgr->max_payloads; i++) { + + if (!mgr->proposed_vcpis[i]) + continue; + + port = container_of(mgr->proposed_vcpis[i], struct drm_dp_mst_port, vcpi); + + DRM_DEBUG_KMS("payload %d %d\n", i, mgr->payloads[i].payload_state); + if (mgr->payloads[i].payload_state == DP_PAYLOAD_LOCAL) { + ret = drm_dp_create_payload_step2(mgr, port, i + 1, &mgr->payloads[i]); + } else if (mgr->payloads[i].payload_state == DP_PAYLOAD_DELETE_LOCAL) { + ret = drm_dp_destroy_payload_step2(mgr, i + 1, &mgr->payloads[i]); + } + if (ret) { + mutex_unlock(&mgr->payload_lock); + return ret; + } + } + mutex_unlock(&mgr->payload_lock); + return 0; +} +EXPORT_SYMBOL(drm_dp_update_payload_part2); + +#if 0 /* unused as of yet */ +static int drm_dp_send_dpcd_read(struct drm_dp_mst_topology_mgr *mgr, + struct drm_dp_mst_port *port, + int offset, int size) +{ + int len; + struct drm_dp_sideband_msg_tx *txmsg; + + txmsg = kzalloc(sizeof(*txmsg), GFP_KERNEL); + if (!txmsg) + return -ENOMEM; + + len = build_dpcd_read(txmsg, port->port_num, 0, 8); + txmsg->dst = port->parent; + + drm_dp_queue_down_tx(mgr, txmsg); + + return 0; +} +#endif + +static int drm_dp_send_dpcd_write(struct drm_dp_mst_topology_mgr *mgr, + struct drm_dp_mst_port *port, + int offset, int size, u8 *bytes) +{ + int len; + int ret; + struct drm_dp_sideband_msg_tx *txmsg; + struct drm_dp_mst_branch *mstb; + + mstb = drm_dp_get_validated_mstb_ref(mgr, port->parent); + if (!mstb) + return -EINVAL; + + txmsg = kzalloc(sizeof(*txmsg), GFP_KERNEL); + if (!txmsg) { + ret = -ENOMEM; + goto fail_put; + } + + len = build_dpcd_write(txmsg, port->port_num, offset, size, bytes); + txmsg->dst = mstb; + + drm_dp_queue_down_tx(mgr, txmsg); + + ret = drm_dp_mst_wait_tx_reply(mstb, txmsg); + if (ret > 0) { + if (txmsg->reply.reply_type == 1) { + ret = -EINVAL; + } else + ret = 0; + } + kfree(txmsg); +fail_put: + drm_dp_put_mst_branch_device(mstb); + return ret; +} + +static int drm_dp_encode_up_ack_reply(struct drm_dp_sideband_msg_tx *msg, u8 req_type) +{ + struct drm_dp_sideband_msg_reply_body reply; + + reply.reply_type = 1; + reply.req_type = req_type; + drm_dp_encode_sideband_reply(&reply, msg); + return 0; +} + +static int drm_dp_send_up_ack_reply(struct drm_dp_mst_topology_mgr *mgr, + struct drm_dp_mst_branch *mstb, + int req_type, int seqno, bool broadcast) +{ + struct drm_dp_sideband_msg_tx *txmsg; + + txmsg = kzalloc(sizeof(*txmsg), GFP_KERNEL); + if (!txmsg) + return -ENOMEM; + + txmsg->dst = mstb; + txmsg->seqno = seqno; + drm_dp_encode_up_ack_reply(txmsg, req_type); + + mutex_lock(&mgr->qlock); + list_add_tail(&txmsg->next, &mgr->tx_msg_upq); + if (!mgr->tx_up_in_progress) { + process_single_up_tx_qlock(mgr); + } + mutex_unlock(&mgr->qlock); + return 0; +} + +static int drm_dp_get_vc_payload_bw(int dp_link_bw, int dp_link_count) +{ + switch (dp_link_bw) { + case DP_LINK_BW_1_62: + return 3 * dp_link_count; + case DP_LINK_BW_2_7: + return 5 * dp_link_count; + case DP_LINK_BW_5_4: + return 10 * dp_link_count; + } + return 0; +} + +/** + * drm_dp_mst_topology_mgr_set_mst() - Set the MST state for a topology manager + * @mgr: manager to set state for + * @mst_state: true to enable MST on this connector - false to disable. + * + * This is called by the driver when it detects an MST capable device plugged + * into a DP MST capable port, or when a DP MST capable device is unplugged. + */ +int drm_dp_mst_topology_mgr_set_mst(struct drm_dp_mst_topology_mgr *mgr, bool mst_state) +{ + int ret = 0; + struct drm_dp_mst_branch *mstb = NULL; + + mutex_lock(&mgr->lock); + if (mst_state == mgr->mst_state) + goto out_unlock; + + mgr->mst_state = mst_state; + /* set the device into MST mode */ + if (mst_state) { + WARN_ON(mgr->mst_primary); + + /* get dpcd info */ + mutex_lock(&mgr->aux_lock); + ret = drm_dp_dpcd_read(mgr->aux, DP_DPCD_REV, mgr->dpcd, DP_RECEIVER_CAP_SIZE); + mutex_unlock(&mgr->aux_lock); + if (ret != DP_RECEIVER_CAP_SIZE) { + DRM_DEBUG_KMS("failed to read DPCD\n"); + goto out_unlock; + } + + mgr->pbn_div = drm_dp_get_vc_payload_bw(mgr->dpcd[1], mgr->dpcd[2] & DP_MAX_LANE_COUNT_MASK); + mgr->total_pbn = 2560; + mgr->total_slots = DIV_ROUND_UP(mgr->total_pbn, mgr->pbn_div); + mgr->avail_slots = mgr->total_slots; + + /* add initial branch device at LCT 1 */ + mstb = drm_dp_add_mst_branch_device(1, NULL); + if (mstb == NULL) { + ret = -ENOMEM; + goto out_unlock; + } + mstb->mgr = mgr; + + /* give this the main reference */ + mgr->mst_primary = mstb; + kref_get(&mgr->mst_primary->kref); + + { + struct drm_dp_payload reset_pay; + reset_pay.start_slot = 0; + reset_pay.num_slots = 0x3f; + drm_dp_dpcd_write_payload(mgr, 0, &reset_pay); + } + + mutex_lock(&mgr->aux_lock); + ret = drm_dp_dpcd_writeb(mgr->aux, DP_MSTM_CTRL, + DP_MST_EN | DP_UP_REQ_EN | DP_UPSTREAM_IS_SRC); + mutex_unlock(&mgr->aux_lock); + if (ret < 0) { + goto out_unlock; + } + + + /* sort out guid */ + mutex_lock(&mgr->aux_lock); + ret = drm_dp_dpcd_read(mgr->aux, DP_GUID, mgr->guid, 16); + mutex_unlock(&mgr->aux_lock); + if (ret != 16) { + DRM_DEBUG_KMS("failed to read DP GUID %d\n", ret); + goto out_unlock; + } + + mgr->guid_valid = drm_dp_validate_guid(mgr, mgr->guid); + if (!mgr->guid_valid) { + ret = drm_dp_dpcd_write(mgr->aux, DP_GUID, mgr->guid, 16); + mgr->guid_valid = true; + } + + queue_work(system_long_wq, &mgr->work); + + ret = 0; + } else { + /* disable MST on the device */ + mstb = mgr->mst_primary; + mgr->mst_primary = NULL; + /* this can fail if the device is gone */ + drm_dp_dpcd_writeb(mgr->aux, DP_MSTM_CTRL, 0); + ret = 0; + memset(mgr->payloads, 0, mgr->max_payloads * sizeof(struct drm_dp_payload)); + mgr->payload_mask = 0; + set_bit(0, &mgr->payload_mask); + } + +out_unlock: + mutex_unlock(&mgr->lock); + if (mstb) + drm_dp_put_mst_branch_device(mstb); + return ret; + +} +EXPORT_SYMBOL(drm_dp_mst_topology_mgr_set_mst); + +/** + * drm_dp_mst_topology_mgr_suspend() - suspend the MST manager + * @mgr: manager to suspend + * + * This function tells the MST device that we can't handle UP messages + * anymore. This should stop it from sending any since we are suspended. + */ +void drm_dp_mst_topology_mgr_suspend(struct drm_dp_mst_topology_mgr *mgr) +{ + mutex_lock(&mgr->lock); + mutex_lock(&mgr->aux_lock); + drm_dp_dpcd_writeb(mgr->aux, DP_MSTM_CTRL, + DP_MST_EN | DP_UPSTREAM_IS_SRC); + mutex_unlock(&mgr->aux_lock); + mutex_unlock(&mgr->lock); +} +EXPORT_SYMBOL(drm_dp_mst_topology_mgr_suspend); + +/** + * drm_dp_mst_topology_mgr_resume() - resume the MST manager + * @mgr: manager to resume + * + * This will fetch DPCD and see if the device is still there, + * if it is, it will rewrite the MSTM control bits, and return. + * + * if the device fails this returns -1, and the driver should do + * a full MST reprobe, in case we were undocked. + */ +int drm_dp_mst_topology_mgr_resume(struct drm_dp_mst_topology_mgr *mgr) +{ + int ret = 0; + + mutex_lock(&mgr->lock); + + if (mgr->mst_primary) { + int sret; + mutex_lock(&mgr->aux_lock); + sret = drm_dp_dpcd_read(mgr->aux, DP_DPCD_REV, mgr->dpcd, DP_RECEIVER_CAP_SIZE); + mutex_unlock(&mgr->aux_lock); + if (sret != DP_RECEIVER_CAP_SIZE) { + DRM_DEBUG_KMS("dpcd read failed - undocked during suspend?\n"); + ret = -1; + goto out_unlock; + } + + mutex_lock(&mgr->aux_lock); + ret = drm_dp_dpcd_writeb(mgr->aux, DP_MSTM_CTRL, + DP_MST_EN | DP_UP_REQ_EN | DP_UPSTREAM_IS_SRC); + mutex_unlock(&mgr->aux_lock); + if (ret < 0) { + DRM_DEBUG_KMS("mst write failed - undocked during suspend?\n"); + ret = -1; + goto out_unlock; + } + ret = 0; + } else + ret = -1; + +out_unlock: + mutex_unlock(&mgr->lock); + return ret; +} +EXPORT_SYMBOL(drm_dp_mst_topology_mgr_resume); + +static void drm_dp_get_one_sb_msg(struct drm_dp_mst_topology_mgr *mgr, bool up) +{ + int len; + u8 replyblock[32]; + int replylen, origlen, curreply; + int ret; + struct drm_dp_sideband_msg_rx *msg; + int basereg = up ? DP_SIDEBAND_MSG_UP_REQ_BASE : DP_SIDEBAND_MSG_DOWN_REP_BASE; + msg = up ? &mgr->up_req_recv : &mgr->down_rep_recv; + + len = min(mgr->max_dpcd_transaction_bytes, 16); + mutex_lock(&mgr->aux_lock); + ret = drm_dp_dpcd_read(mgr->aux, basereg, + replyblock, len); + mutex_unlock(&mgr->aux_lock); + if (ret != len) { + DRM_DEBUG_KMS("failed to read DPCD down rep %d %d\n", len, ret); + return; + } + ret = drm_dp_sideband_msg_build(msg, replyblock, len, true); + if (!ret) { + DRM_DEBUG_KMS("sideband msg build failed %d\n", replyblock[0]); + return; + } + replylen = msg->curchunk_len + msg->curchunk_hdrlen; + + origlen = replylen; + replylen -= len; + curreply = len; + while (replylen > 0) { + len = min3(replylen, mgr->max_dpcd_transaction_bytes, 16); + mutex_lock(&mgr->aux_lock); + ret = drm_dp_dpcd_read(mgr->aux, basereg + curreply, + replyblock, len); + mutex_unlock(&mgr->aux_lock); + if (ret != len) { + DRM_DEBUG_KMS("failed to read a chunk\n"); + } + ret = drm_dp_sideband_msg_build(msg, replyblock, len, false); + if (ret == false) + DRM_DEBUG_KMS("failed to build sideband msg\n"); + curreply += len; + replylen -= len; + } +} + +static int drm_dp_mst_handle_down_rep(struct drm_dp_mst_topology_mgr *mgr) +{ + int ret = 0; + + drm_dp_get_one_sb_msg(mgr, false); + + if (mgr->down_rep_recv.have_eomt) { + struct drm_dp_sideband_msg_tx *txmsg; + struct drm_dp_mst_branch *mstb; + int slot = -1; + mstb = drm_dp_get_mst_branch_device(mgr, + mgr->down_rep_recv.initial_hdr.lct, + mgr->down_rep_recv.initial_hdr.rad); + + if (!mstb) { + DRM_DEBUG_KMS("Got MST reply from unknown device %d\n", mgr->down_rep_recv.initial_hdr.lct); + memset(&mgr->down_rep_recv, 0, sizeof(struct drm_dp_sideband_msg_rx)); + return 0; + } + + /* find the message */ + slot = mgr->down_rep_recv.initial_hdr.seqno; + mutex_lock(&mgr->qlock); + txmsg = mstb->tx_slots[slot]; + /* remove from slots */ + mutex_unlock(&mgr->qlock); + + if (!txmsg) { + DRM_DEBUG_KMS("Got MST reply with no msg %p %d %d %02x %02x\n", + mstb, + mgr->down_rep_recv.initial_hdr.seqno, + mgr->down_rep_recv.initial_hdr.lct, + mgr->down_rep_recv.initial_hdr.rad[0], + mgr->down_rep_recv.msg[0]); + drm_dp_put_mst_branch_device(mstb); + memset(&mgr->down_rep_recv, 0, sizeof(struct drm_dp_sideband_msg_rx)); + return 0; + } + + drm_dp_sideband_parse_reply(&mgr->down_rep_recv, &txmsg->reply); + if (txmsg->reply.reply_type == 1) { + DRM_DEBUG_KMS("Got NAK reply: req 0x%02x, reason 0x%02x, nak data 0x%02x\n", txmsg->reply.req_type, txmsg->reply.u.nak.reason, txmsg->reply.u.nak.nak_data); + } + + memset(&mgr->down_rep_recv, 0, sizeof(struct drm_dp_sideband_msg_rx)); + drm_dp_put_mst_branch_device(mstb); + + mutex_lock(&mgr->qlock); + txmsg->state = DRM_DP_SIDEBAND_TX_RX; + mstb->tx_slots[slot] = NULL; + mutex_unlock(&mgr->qlock); + + wake_up(&mgr->tx_waitq); + } + return ret; +} + +static int drm_dp_mst_handle_up_req(struct drm_dp_mst_topology_mgr *mgr) +{ + int ret = 0; + drm_dp_get_one_sb_msg(mgr, true); + + if (mgr->up_req_recv.have_eomt) { + struct drm_dp_sideband_msg_req_body msg; + struct drm_dp_mst_branch *mstb; + bool seqno; + mstb = drm_dp_get_mst_branch_device(mgr, + mgr->up_req_recv.initial_hdr.lct, + mgr->up_req_recv.initial_hdr.rad); + if (!mstb) { + DRM_DEBUG_KMS("Got MST reply from unknown device %d\n", mgr->up_req_recv.initial_hdr.lct); + memset(&mgr->up_req_recv, 0, sizeof(struct drm_dp_sideband_msg_rx)); + return 0; + } + + seqno = mgr->up_req_recv.initial_hdr.seqno; + drm_dp_sideband_parse_req(&mgr->up_req_recv, &msg); + + if (msg.req_type == DP_CONNECTION_STATUS_NOTIFY) { + drm_dp_send_up_ack_reply(mgr, mstb, msg.req_type, seqno, false); + drm_dp_update_port(mstb, &msg.u.conn_stat); + DRM_DEBUG_KMS("Got CSN: pn: %d ldps:%d ddps: %d mcs: %d ip: %d pdt: %d\n", msg.u.conn_stat.port_number, msg.u.conn_stat.legacy_device_plug_status, msg.u.conn_stat.displayport_device_plug_status, msg.u.conn_stat.message_capability_status, msg.u.conn_stat.input_port, msg.u.conn_stat.peer_device_type); + (*mgr->cbs->hotplug)(mgr); + + } else if (msg.req_type == DP_RESOURCE_STATUS_NOTIFY) { + drm_dp_send_up_ack_reply(mgr, mstb, msg.req_type, seqno, false); + DRM_DEBUG_KMS("Got RSN: pn: %d avail_pbn %d\n", msg.u.resource_stat.port_number, msg.u.resource_stat.available_pbn); + } + + drm_dp_put_mst_branch_device(mstb); + memset(&mgr->up_req_recv, 0, sizeof(struct drm_dp_sideband_msg_rx)); + } + return ret; +} + +/** + * drm_dp_mst_hpd_irq() - MST hotplug IRQ notify + * @mgr: manager to notify irq for. + * @esi: 4 bytes from SINK_COUNT_ESI + * + * This should be called from the driver when it detects a short IRQ, + * along with the value of the DEVICE_SERVICE_IRQ_VECTOR_ESI0. The + * topology manager will process the sideband messages received as a result + * of this. + */ +int drm_dp_mst_hpd_irq(struct drm_dp_mst_topology_mgr *mgr, u8 *esi, bool *handled) +{ + int ret = 0; + int sc; + *handled = false; + sc = esi[0] & 0x3f; + if (sc != mgr->sink_count) { + + if (mgr->mst_primary && mgr->sink_count == 0 && sc) { + mgr->mst_primary->link_address_sent = false; + queue_work(system_long_wq, &mgr->work); + } + mgr->sink_count = sc; + *handled = true; + + } + + if (esi[1] & DP_DOWN_REP_MSG_RDY) { + ret = drm_dp_mst_handle_down_rep(mgr); + *handled = true; + } + + if (esi[1] & DP_UP_REQ_MSG_RDY) { + ret |= drm_dp_mst_handle_up_req(mgr); + *handled = true; + } + + drm_dp_mst_kick_tx(mgr); + return ret; +} +EXPORT_SYMBOL(drm_dp_mst_hpd_irq); + +/** + * drm_dp_mst_detect_port() - get connection status for an MST port + * @mgr: manager for this port + * @port: unverified pointer to a port + * + * This returns the current connection state for a port. It validates the + * port pointer still exists so the caller doesn't require a reference + */ +enum drm_connector_status drm_dp_mst_detect_port(struct drm_dp_mst_topology_mgr *mgr, struct drm_dp_mst_port *port) +{ + enum drm_connector_status status = connector_status_disconnected; + + /* we need to search for the port in the mgr in case its gone */ + port = drm_dp_get_validated_port_ref(mgr, port); + if (!port) + return connector_status_disconnected; + + if (!port->ddps) + goto out; + + switch (port->pdt) { + case DP_PEER_DEVICE_NONE: + case DP_PEER_DEVICE_MST_BRANCHING: + break; + + case DP_PEER_DEVICE_SST_SINK: + status = connector_status_connected; + break; + case DP_PEER_DEVICE_DP_LEGACY_CONV: + if (port->ldps) + status = connector_status_connected; + break; + } +out: + drm_dp_put_port(port); + return status; +} +EXPORT_SYMBOL(drm_dp_mst_detect_port); + +/** + * drm_dp_mst_get_edid() - get EDID for an MST port + * @connector: toplevel connector to get EDID for + * @mgr: manager for this port + * @port: unverified pointer to a port. + * + * This returns an EDID for the port connected to a connector, + * It validates the pointer still exists so the caller doesn't require a + * reference. + */ +struct edid *drm_dp_mst_get_edid(struct drm_connector *connector, struct drm_dp_mst_topology_mgr *mgr, struct drm_dp_mst_port *port) +{ + struct edid *edid = NULL; + + /* we need to search for the port in the mgr in case its gone */ + port = drm_dp_get_validated_port_ref(mgr, port); + if (!port) + return NULL; + + edid = drm_get_edid(connector, &port->aux.ddc); + drm_dp_put_port(port); + return edid; +} +EXPORT_SYMBOL(drm_dp_mst_get_edid); + +/** + * drm_dp_find_vcpi_slots() - find slots for this PBN value + * @mgr: manager to use + * @pbn: payload bandwidth to convert into slots. + */ +int drm_dp_find_vcpi_slots(struct drm_dp_mst_topology_mgr *mgr, + int pbn) +{ + int num_slots; + + num_slots = DIV_ROUND_UP(pbn, mgr->pbn_div); + + if (num_slots > mgr->avail_slots) + return -ENOSPC; + return num_slots; +} +EXPORT_SYMBOL(drm_dp_find_vcpi_slots); + +static int drm_dp_init_vcpi(struct drm_dp_mst_topology_mgr *mgr, + struct drm_dp_vcpi *vcpi, int pbn) +{ + int num_slots; + int ret; + + num_slots = DIV_ROUND_UP(pbn, mgr->pbn_div); + + if (num_slots > mgr->avail_slots) + return -ENOSPC; + + vcpi->pbn = pbn; + vcpi->aligned_pbn = num_slots * mgr->pbn_div; + vcpi->num_slots = num_slots; + + ret = drm_dp_mst_assign_payload_id(mgr, vcpi); + if (ret < 0) + return ret; + return 0; +} + +/** + * drm_dp_mst_allocate_vcpi() - Allocate a virtual channel + * @mgr: manager for this port + * @port: port to allocate a virtual channel for. + * @pbn: payload bandwidth number to request + * @slots: returned number of slots for this PBN. + */ +bool drm_dp_mst_allocate_vcpi(struct drm_dp_mst_topology_mgr *mgr, struct drm_dp_mst_port *port, int pbn, int *slots) +{ + int ret; + + port = drm_dp_get_validated_port_ref(mgr, port); + if (!port) + return false; + + if (port->vcpi.vcpi > 0) { + DRM_DEBUG_KMS("payload: vcpi %d already allocated for pbn %d - requested pbn %d\n", port->vcpi.vcpi, port->vcpi.pbn, pbn); + if (pbn == port->vcpi.pbn) { + *slots = port->vcpi.num_slots; + return true; + } + } + + ret = drm_dp_init_vcpi(mgr, &port->vcpi, pbn); + if (ret) { + DRM_DEBUG_KMS("failed to init vcpi %d %d %d\n", DIV_ROUND_UP(pbn, mgr->pbn_div), mgr->avail_slots, ret); + goto out; + } + DRM_DEBUG_KMS("initing vcpi for %d %d\n", pbn, port->vcpi.num_slots); + *slots = port->vcpi.num_slots; + + drm_dp_put_port(port); + return true; +out: + return false; +} +EXPORT_SYMBOL(drm_dp_mst_allocate_vcpi); + +/** + * drm_dp_mst_reset_vcpi_slots() - Reset number of slots to 0 for VCPI + * @mgr: manager for this port + * @port: unverified pointer to a port. + * + * This just resets the number of slots for the ports VCPI for later programming. + */ +void drm_dp_mst_reset_vcpi_slots(struct drm_dp_mst_topology_mgr *mgr, struct drm_dp_mst_port *port) +{ + port = drm_dp_get_validated_port_ref(mgr, port); + if (!port) + return; + port->vcpi.num_slots = 0; + drm_dp_put_port(port); +} +EXPORT_SYMBOL(drm_dp_mst_reset_vcpi_slots); + +/** + * drm_dp_mst_deallocate_vcpi() - deallocate a VCPI + * @mgr: manager for this port + * @port: unverified port to deallocate vcpi for + */ +void drm_dp_mst_deallocate_vcpi(struct drm_dp_mst_topology_mgr *mgr, struct drm_dp_mst_port *port) +{ + port = drm_dp_get_validated_port_ref(mgr, port); + if (!port) + return; + + drm_dp_mst_put_payload_id(mgr, port->vcpi.vcpi); + port->vcpi.num_slots = 0; + port->vcpi.pbn = 0; + port->vcpi.aligned_pbn = 0; + port->vcpi.vcpi = 0; + drm_dp_put_port(port); +} +EXPORT_SYMBOL(drm_dp_mst_deallocate_vcpi); + +static int drm_dp_dpcd_write_payload(struct drm_dp_mst_topology_mgr *mgr, + int id, struct drm_dp_payload *payload) +{ + u8 payload_alloc[3], status; + int ret; + int retries = 0; + + mutex_lock(&mgr->aux_lock); + drm_dp_dpcd_writeb(mgr->aux, DP_PAYLOAD_TABLE_UPDATE_STATUS, + DP_PAYLOAD_TABLE_UPDATED); + mutex_unlock(&mgr->aux_lock); + + payload_alloc[0] = id; + payload_alloc[1] = payload->start_slot; + payload_alloc[2] = payload->num_slots; + + mutex_lock(&mgr->aux_lock); + ret = drm_dp_dpcd_write(mgr->aux, DP_PAYLOAD_ALLOCATE_SET, payload_alloc, 3); + mutex_unlock(&mgr->aux_lock); + if (ret != 3) { + DRM_DEBUG_KMS("failed to write payload allocation %d\n", ret); + goto fail; + } + +retry: + mutex_lock(&mgr->aux_lock); + ret = drm_dp_dpcd_readb(mgr->aux, DP_PAYLOAD_TABLE_UPDATE_STATUS, &status); + mutex_unlock(&mgr->aux_lock); + if (ret < 0) { + DRM_DEBUG_KMS("failed to read payload table status %d\n", ret); + goto fail; + } + + if (!(status & DP_PAYLOAD_TABLE_UPDATED)) { + retries++; + if (retries < 20) { + usleep_range(10000, 20000); + goto retry; + } + DRM_DEBUG_KMS("status not set after read payload table status %d\n", status); + ret = -EINVAL; + goto fail; + } + ret = 0; +fail: + return ret; +} + + +/** + * drm_dp_check_act_status() - Check ACT handled status. + * @mgr: manager to use + * + * Check the payload status bits in the DPCD for ACT handled completion. + */ +int drm_dp_check_act_status(struct drm_dp_mst_topology_mgr *mgr) +{ + u8 status; + int ret; + int count = 0; + + do { + mutex_lock(&mgr->aux_lock); + ret = drm_dp_dpcd_readb(mgr->aux, DP_PAYLOAD_TABLE_UPDATE_STATUS, &status); + mutex_unlock(&mgr->aux_lock); + + if (ret < 0) { + DRM_DEBUG_KMS("failed to read payload table status %d\n", ret); + goto fail; + } + + if (status & DP_PAYLOAD_ACT_HANDLED) + break; + count++; + udelay(100); + + } while (count < 30); + + if (!(status & DP_PAYLOAD_ACT_HANDLED)) { + DRM_DEBUG_KMS("failed to get ACT bit %d after %d retries\n", status, count); + ret = -EINVAL; + goto fail; + } + return 0; +fail: + return ret; +} +EXPORT_SYMBOL(drm_dp_check_act_status); + +/** + * drm_dp_calc_pbn_mode() - Calculate the PBN for a mode. + * @clock: dot clock for the mode + * @bpp: bpp for the mode. + * + * This uses the formula in the spec to calculate the PBN value for a mode. + */ +int drm_dp_calc_pbn_mode(int clock, int bpp) +{ + fixed20_12 pix_bw; + fixed20_12 fbpp; + fixed20_12 result; + fixed20_12 margin, tmp; + u32 res; + + pix_bw.full = dfixed_const(clock); + fbpp.full = dfixed_const(bpp); + tmp.full = dfixed_const(8); + fbpp.full = dfixed_div(fbpp, tmp); + + result.full = dfixed_mul(pix_bw, fbpp); + margin.full = dfixed_const(54); + tmp.full = dfixed_const(64); + margin.full = dfixed_div(margin, tmp); + result.full = dfixed_div(result, margin); + + margin.full = dfixed_const(1006); + tmp.full = dfixed_const(1000); + margin.full = dfixed_div(margin, tmp); + result.full = dfixed_mul(result, margin); + + result.full = dfixed_div(result, tmp); + result.full = dfixed_ceil(result); + res = dfixed_trunc(result); + return res; +} +EXPORT_SYMBOL(drm_dp_calc_pbn_mode); + +static int test_calc_pbn_mode(void) +{ + int ret; + ret = drm_dp_calc_pbn_mode(154000, 30); + if (ret != 689) + return -EINVAL; + ret = drm_dp_calc_pbn_mode(234000, 30); + if (ret != 1047) + return -EINVAL; + return 0; +} + +/* we want to kick the TX after we've ack the up/down IRQs. */ +static void drm_dp_mst_kick_tx(struct drm_dp_mst_topology_mgr *mgr) +{ + queue_work(system_long_wq, &mgr->tx_work); +} + +static void drm_dp_mst_dump_mstb(struct seq_file *m, + struct drm_dp_mst_branch *mstb) +{ + struct drm_dp_mst_port *port; + int tabs = mstb->lct; + char prefix[10]; + int i; + + for (i = 0; i < tabs; i++) + prefix[i] = '\t'; + prefix[i] = '\0'; + + seq_printf(m, "%smst: %p, %d\n", prefix, mstb, mstb->num_ports); + list_for_each_entry(port, &mstb->ports, next) { + seq_printf(m, "%sport: %d: ddps: %d ldps: %d, %p, conn: %p\n", prefix, port->port_num, port->ddps, port->ldps, port, port->connector); + if (port->mstb) + drm_dp_mst_dump_mstb(m, port->mstb); + } +} + +static bool dump_dp_payload_table(struct drm_dp_mst_topology_mgr *mgr, + char *buf) +{ + int ret; + int i; + mutex_lock(&mgr->aux_lock); + for (i = 0; i < 4; i++) { + ret = drm_dp_dpcd_read(mgr->aux, DP_PAYLOAD_TABLE_UPDATE_STATUS + (i * 16), &buf[i * 16], 16); + if (ret != 16) + break; + } + mutex_unlock(&mgr->aux_lock); + if (i == 4) + return true; + return false; +} + +/** + * drm_dp_mst_dump_topology(): dump topology to seq file. + * @m: seq_file to dump output to + * @mgr: manager to dump current topology for. + * + * helper to dump MST topology to a seq file for debugfs. + */ +void drm_dp_mst_dump_topology(struct seq_file *m, + struct drm_dp_mst_topology_mgr *mgr) +{ + int i; + struct drm_dp_mst_port *port; + mutex_lock(&mgr->lock); + if (mgr->mst_primary) + drm_dp_mst_dump_mstb(m, mgr->mst_primary); + + /* dump VCPIs */ + mutex_unlock(&mgr->lock); + + mutex_lock(&mgr->payload_lock); + seq_printf(m, "vcpi: %lx\n", mgr->payload_mask); + + for (i = 0; i < mgr->max_payloads; i++) { + if (mgr->proposed_vcpis[i]) { + port = container_of(mgr->proposed_vcpis[i], struct drm_dp_mst_port, vcpi); + seq_printf(m, "vcpi %d: %d %d %d\n", i, port->port_num, port->vcpi.vcpi, port->vcpi.num_slots); + } else + seq_printf(m, "vcpi %d:unsed\n", i); + } + for (i = 0; i < mgr->max_payloads; i++) { + seq_printf(m, "payload %d: %d, %d, %d\n", + i, + mgr->payloads[i].payload_state, + mgr->payloads[i].start_slot, + mgr->payloads[i].num_slots); + + + } + mutex_unlock(&mgr->payload_lock); + + mutex_lock(&mgr->lock); + if (mgr->mst_primary) { + u8 buf[64]; + bool bret; + int ret; + ret = drm_dp_dpcd_read(mgr->aux, DP_DPCD_REV, buf, DP_RECEIVER_CAP_SIZE); + seq_printf(m, "dpcd: "); + for (i = 0; i < DP_RECEIVER_CAP_SIZE; i++) + seq_printf(m, "%02x ", buf[i]); + seq_printf(m, "\n"); + ret = drm_dp_dpcd_read(mgr->aux, DP_FAUX_CAP, buf, 2); + seq_printf(m, "faux/mst: "); + for (i = 0; i < 2; i++) + seq_printf(m, "%02x ", buf[i]); + seq_printf(m, "\n"); + ret = drm_dp_dpcd_read(mgr->aux, DP_MSTM_CTRL, buf, 1); + seq_printf(m, "mst ctrl: "); + for (i = 0; i < 1; i++) + seq_printf(m, "%02x ", buf[i]); + seq_printf(m, "\n"); + + bret = dump_dp_payload_table(mgr, buf); + if (bret == true) { + seq_printf(m, "payload table: "); + for (i = 0; i < 63; i++) + seq_printf(m, "%02x ", buf[i]); + seq_printf(m, "\n"); + } + + } + + mutex_unlock(&mgr->lock); + +} +EXPORT_SYMBOL(drm_dp_mst_dump_topology); + +static void drm_dp_tx_work(struct work_struct *work) +{ + struct drm_dp_mst_topology_mgr *mgr = container_of(work, struct drm_dp_mst_topology_mgr, tx_work); + + mutex_lock(&mgr->qlock); + if (mgr->tx_down_in_progress) + process_single_down_tx_qlock(mgr); + mutex_unlock(&mgr->qlock); +} + +/** + * drm_dp_mst_topology_mgr_init - initialise a topology manager + * @mgr: manager struct to initialise + * @dev: device providing this structure - for i2c addition. + * @aux: DP helper aux channel to talk to this device + * @max_dpcd_transaction_bytes: hw specific DPCD transaction limit + * @max_payloads: maximum number of payloads this GPU can source + * @conn_base_id: the connector object ID the MST device is connected to. + * + * Return 0 for success, or negative error code on failure + */ +int drm_dp_mst_topology_mgr_init(struct drm_dp_mst_topology_mgr *mgr, + struct device *dev, struct drm_dp_aux *aux, + int max_dpcd_transaction_bytes, + int max_payloads, int conn_base_id) +{ + mutex_init(&mgr->lock); + mutex_init(&mgr->qlock); + mutex_init(&mgr->aux_lock); + mutex_init(&mgr->payload_lock); + INIT_LIST_HEAD(&mgr->tx_msg_upq); + INIT_LIST_HEAD(&mgr->tx_msg_downq); + INIT_WORK(&mgr->work, drm_dp_mst_link_probe_work); + INIT_WORK(&mgr->tx_work, drm_dp_tx_work); + init_waitqueue_head(&mgr->tx_waitq); + mgr->dev = dev; + mgr->aux = aux; + mgr->max_dpcd_transaction_bytes = max_dpcd_transaction_bytes; + mgr->max_payloads = max_payloads; + mgr->conn_base_id = conn_base_id; + mgr->payloads = kcalloc(max_payloads, sizeof(struct drm_dp_payload), GFP_KERNEL); + if (!mgr->payloads) + return -ENOMEM; + mgr->proposed_vcpis = kcalloc(max_payloads, sizeof(struct drm_dp_vcpi *), GFP_KERNEL); + if (!mgr->proposed_vcpis) + return -ENOMEM; + set_bit(0, &mgr->payload_mask); + test_calc_pbn_mode(); + return 0; +} +EXPORT_SYMBOL(drm_dp_mst_topology_mgr_init); + +/** + * drm_dp_mst_topology_mgr_destroy() - destroy topology manager. + * @mgr: manager to destroy + */ +void drm_dp_mst_topology_mgr_destroy(struct drm_dp_mst_topology_mgr *mgr) +{ + mutex_lock(&mgr->payload_lock); + kfree(mgr->payloads); + mgr->payloads = NULL; + kfree(mgr->proposed_vcpis); + mgr->proposed_vcpis = NULL; + mutex_unlock(&mgr->payload_lock); + mgr->dev = NULL; + mgr->aux = NULL; +} +EXPORT_SYMBOL(drm_dp_mst_topology_mgr_destroy); + +/* I2C device */ +static int drm_dp_mst_i2c_xfer(struct i2c_adapter *adapter, struct i2c_msg *msgs, + int num) +{ + struct drm_dp_aux *aux = adapter->algo_data; + struct drm_dp_mst_port *port = container_of(aux, struct drm_dp_mst_port, aux); + struct drm_dp_mst_branch *mstb; + struct drm_dp_mst_topology_mgr *mgr = port->mgr; + unsigned int i; + bool reading = false; + struct drm_dp_sideband_msg_req_body msg; + struct drm_dp_sideband_msg_tx *txmsg = NULL; + int ret; + + mstb = drm_dp_get_validated_mstb_ref(mgr, port->parent); + if (!mstb) + return -EREMOTEIO; + + /* construct i2c msg */ + /* see if last msg is a read */ + if (msgs[num - 1].flags & I2C_M_RD) + reading = true; + + if (!reading) { + DRM_DEBUG_KMS("Unsupported I2C transaction for MST device\n"); + ret = -EIO; + goto out; + } + + msg.req_type = DP_REMOTE_I2C_READ; + msg.u.i2c_read.num_transactions = num - 1; + msg.u.i2c_read.port_number = port->port_num; + for (i = 0; i < num - 1; i++) { + msg.u.i2c_read.transactions[i].i2c_dev_id = msgs[i].addr; + msg.u.i2c_read.transactions[i].num_bytes = msgs[i].len; + memcpy(&msg.u.i2c_read.transactions[i].bytes, msgs[i].buf, msgs[i].len); + } + msg.u.i2c_read.read_i2c_device_id = msgs[num - 1].addr; + msg.u.i2c_read.num_bytes_read = msgs[num - 1].len; + + txmsg = kzalloc(sizeof(*txmsg), GFP_KERNEL); + if (!txmsg) { + ret = -ENOMEM; + goto out; + } + + txmsg->dst = mstb; + drm_dp_encode_sideband_req(&msg, txmsg); + + drm_dp_queue_down_tx(mgr, txmsg); + + ret = drm_dp_mst_wait_tx_reply(mstb, txmsg); + if (ret > 0) { + + if (txmsg->reply.reply_type == 1) { /* got a NAK back */ + ret = -EREMOTEIO; + goto out; + } + if (txmsg->reply.u.remote_i2c_read_ack.num_bytes != msgs[num - 1].len) { + ret = -EIO; + goto out; + } + memcpy(msgs[num - 1].buf, txmsg->reply.u.remote_i2c_read_ack.bytes, msgs[num - 1].len); + ret = num; + } +out: + kfree(txmsg); + drm_dp_put_mst_branch_device(mstb); + return ret; +} + +static u32 drm_dp_mst_i2c_functionality(struct i2c_adapter *adapter) +{ + return I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL | + I2C_FUNC_SMBUS_READ_BLOCK_DATA | + I2C_FUNC_SMBUS_BLOCK_PROC_CALL | + I2C_FUNC_10BIT_ADDR; +} + +static const struct i2c_algorithm drm_dp_mst_i2c_algo = { + .functionality = drm_dp_mst_i2c_functionality, + .master_xfer = drm_dp_mst_i2c_xfer, +}; + +/** + * drm_dp_mst_register_i2c_bus() - register an I2C adapter for I2C-over-AUX + * @aux: DisplayPort AUX channel + * + * Returns 0 on success or a negative error code on failure. + */ +static int drm_dp_mst_register_i2c_bus(struct drm_dp_aux *aux) +{ + aux->ddc.algo = &drm_dp_mst_i2c_algo; + aux->ddc.algo_data = aux; + aux->ddc.retries = 3; + + aux->ddc.class = I2C_CLASS_DDC; + aux->ddc.owner = THIS_MODULE; + aux->ddc.dev.parent = aux->dev; + aux->ddc.dev.of_node = aux->dev->of_node; + + strlcpy(aux->ddc.name, aux->name ? aux->name : dev_name(aux->dev), + sizeof(aux->ddc.name)); + + return i2c_add_adapter(&aux->ddc); +} + +/** + * drm_dp_mst_unregister_i2c_bus() - unregister an I2C-over-AUX adapter + * @aux: DisplayPort AUX channel + */ +static void drm_dp_mst_unregister_i2c_bus(struct drm_dp_aux *aux) +{ + i2c_del_adapter(&aux->ddc); +} diff --git a/include/drm/drm_dp_mst_helper.h b/include/drm/drm_dp_mst_helper.h new file mode 100644 index 0000000..6626d1b --- /dev/null +++ b/include/drm/drm_dp_mst_helper.h @@ -0,0 +1,507 @@ +/* + * Copyright © 2014 Red Hat. + * + * Permission to use, copy, modify, distribute, and sell this software and its + * documentation for any purpose is hereby granted without fee, provided that + * the above copyright notice appear in all copies and that both that copyright + * notice and this permission notice appear in supporting documentation, and + * that the name of the copyright holders not be used in advertising or + * publicity pertaining to distribution of the software without specific, + * written prior permission. The copyright holders make no representations + * about the suitability of this software for any purpose. It is provided "as + * is" without express or implied warranty. + * + * THE COPYRIGHT HOLDERS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, + * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO + * EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY SPECIAL, INDIRECT OR + * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, + * DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER + * TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE + * OF THIS SOFTWARE. + */ +#ifndef _DRM_DP_MST_HELPER_H_ +#define _DRM_DP_MST_HELPER_H_ + +#include <linux/types.h> +#include <drm/drm_dp_helper.h> + +struct drm_dp_mst_branch; + +/** + * struct drm_dp_vcpi - Virtual Channel Payload Identifer + * @vcpi: Virtual channel ID. + * @pbn: Payload Bandwidth Number for this channel + * @aligned_pbn: PBN aligned with slot size + * @num_slots: number of slots for this PBN + */ +struct drm_dp_vcpi { + int vcpi; + int pbn; + int aligned_pbn; + int num_slots; +}; + +/** + * struct drm_dp_mst_port - MST port + * @kref: reference count for this port. + * @guid_valid: for DP 1.2 devices if we have validated the GUID. + * @guid: guid for DP 1.2 device on this port. + * @port_num: port number + * @input: if this port is an input port. + * @mcs: message capability status - DP 1.2 spec. + * @ddps: DisplayPort Device Plug Status - DP 1.2 + * @pdt: Peer Device Type + * @ldps: Legacy Device Plug Status + * @dpcd_rev: DPCD revision of device on this port + * @available_pbn: Available bandwidth for this port. + * @next: link to next port on this branch device + * @mstb: branch device attach below this port + * @aux: i2c aux transport to talk to device connected to this port. + * @parent: branch device parent of this port + * @vcpi: Virtual Channel Payload info for this port. + * @connector: DRM connector this port is connected to. + * @mgr: topology manager this port lives under. + * + * This structure represents an MST port endpoint on a device somewhere + * in the MST topology. + */ +struct drm_dp_mst_port { + struct kref kref; + + /* if dpcd 1.2 device is on this port - its GUID info */ + bool guid_valid; + u8 guid[16]; + + u8 port_num; + bool input; + bool mcs; + bool ddps; + u8 pdt; + bool ldps; + u8 dpcd_rev; + uint16_t available_pbn; + struct list_head next; + struct drm_dp_mst_branch *mstb; /* pointer to an mstb if this port has one */ + struct drm_dp_aux aux; /* i2c bus for this port? */ + struct drm_dp_mst_branch *parent; + + struct drm_dp_vcpi vcpi; + struct drm_connector *connector; + struct drm_dp_mst_topology_mgr *mgr; +}; + +/** + * struct drm_dp_mst_branch - MST branch device. + * @kref: reference count for this port. + * @rad: Relative Address to talk to this branch device. + * @lct: Link count total to talk to this branch device. + * @num_ports: number of ports on the branch. + * @msg_slots: one bit per transmitted msg slot. + * @ports: linked list of ports on this branch. + * @port_parent: pointer to the port parent, NULL if toplevel. + * @mgr: topology manager for this branch device. + * @tx_slots: transmission slots for this device. + * @last_seqno: last sequence number used to talk to this. + * @link_address_sent: if a link address message has been sent to this device yet. + * + * This structure represents an MST branch device, there is one + * primary branch device at the root, along with any others connected + * to downstream ports + */ +struct drm_dp_mst_branch { + struct kref kref; + u8 rad[8]; + u8 lct; + int num_ports; + + int msg_slots; + struct list_head ports; + + /* list of tx ops queue for this port */ + struct drm_dp_mst_port *port_parent; + struct drm_dp_mst_topology_mgr *mgr; + + /* slots are protected by mstb->mgr->qlock */ + struct drm_dp_sideband_msg_tx *tx_slots[2]; + int last_seqno; + bool link_address_sent; +}; + + +/* sideband msg header - not bit struct */ +struct drm_dp_sideband_msg_hdr { + u8 lct; + u8 lcr; + u8 rad[8]; + bool broadcast; + bool path_msg; + u8 msg_len; + bool somt; + bool eomt; + bool seqno; +}; + +struct drm_dp_nak_reply { + u8 guid[16]; + u8 reason; + u8 nak_data; +}; + +struct drm_dp_link_address_ack_reply { + u8 guid[16]; + u8 nports; + struct drm_dp_link_addr_reply_port { + bool input_port; + u8 peer_device_type; + u8 port_number; + bool mcs; + bool ddps; + bool legacy_device_plug_status; + u8 dpcd_revision; + u8 peer_guid[16]; + bool num_sdp_streams; + bool num_sdp_stream_sinks; + } ports[16]; +}; + +struct drm_dp_remote_dpcd_read_ack_reply { + u8 port_number; + u8 num_bytes; + u8 bytes[255]; +}; + +struct drm_dp_remote_dpcd_write_ack_reply { + u8 port_number; +}; + +struct drm_dp_remote_dpcd_write_nak_reply { + u8 port_number; + u8 reason; + u8 bytes_written_before_failure; +}; + +struct drm_dp_remote_i2c_read_ack_reply { + u8 port_number; + u8 num_bytes; + u8 bytes[255]; +}; + +struct drm_dp_remote_i2c_read_nak_reply { + u8 port_number; + u8 nak_reason; + u8 i2c_nak_transaction; +}; + +struct drm_dp_remote_i2c_write_ack_reply { + u8 port_number; +}; + + +struct drm_dp_sideband_msg_rx { + u8 chunk[48]; + u8 msg[256]; + u8 curchunk_len; + u8 curchunk_idx; /* chunk we are parsing now */ + u8 curchunk_hdrlen; + u8 curlen; /* total length of the msg */ + bool have_somt; + bool have_eomt; + struct drm_dp_sideband_msg_hdr initial_hdr; +}; + + +struct drm_dp_allocate_payload { + u8 port_number; + u8 number_sdp_streams; + u8 vcpi; + u16 pbn; + u8 sdp_stream_sink[8]; +}; + +struct drm_dp_allocate_payload_ack_reply { + u8 port_number; + u8 vcpi; + u16 allocated_pbn; +}; + +struct drm_dp_connection_status_notify { + u8 guid[16]; + u8 port_number; + bool legacy_device_plug_status; + bool displayport_device_plug_status; + bool message_capability_status; + bool input_port; + u8 peer_device_type; +}; + +struct drm_dp_remote_dpcd_read { + u8 port_number; + u32 dpcd_address; + u8 num_bytes; +}; + +struct drm_dp_remote_dpcd_write { + u8 port_number; + u32 dpcd_address; + u8 num_bytes; + u8 bytes[255]; +}; + +struct drm_dp_remote_i2c_read { + u8 num_transactions; + u8 port_number; + struct { + u8 i2c_dev_id; + u8 num_bytes; + u8 bytes[255]; + u8 no_stop_bit; + u8 i2c_transaction_delay; + } transactions[4]; + u8 read_i2c_device_id; + u8 num_bytes_read; +}; + +struct drm_dp_remote_i2c_write { + u8 port_number; + u8 write_i2c_device_id; + u8 num_bytes; + u8 bytes[255]; +}; + +/* this covers ENUM_RESOURCES, POWER_DOWN_PHY, POWER_UP_PHY */ +struct drm_dp_port_number_req { + u8 port_number; +}; + +struct drm_dp_enum_path_resources_ack_reply { + u8 port_number; + u16 full_payload_bw_number; + u16 avail_payload_bw_number; +}; + +/* covers POWER_DOWN_PHY, POWER_UP_PHY */ +struct drm_dp_port_number_rep { + u8 port_number; +}; + +struct drm_dp_query_payload { + u8 port_number; + u8 vcpi; +}; + +struct drm_dp_resource_status_notify { + u8 port_number; + u8 guid[16]; + u16 available_pbn; +}; + +struct drm_dp_query_payload_ack_reply { + u8 port_number; + u8 allocated_pbn; +}; + +struct drm_dp_sideband_msg_req_body { + u8 req_type; + union ack_req { + struct drm_dp_connection_status_notify conn_stat; + struct drm_dp_port_number_req port_num; + struct drm_dp_resource_status_notify resource_stat; + + struct drm_dp_query_payload query_payload; + struct drm_dp_allocate_payload allocate_payload; + + struct drm_dp_remote_dpcd_read dpcd_read; + struct drm_dp_remote_dpcd_write dpcd_write; + + struct drm_dp_remote_i2c_read i2c_read; + struct drm_dp_remote_i2c_write i2c_write; + } u; +}; + +struct drm_dp_sideband_msg_reply_body { + u8 reply_type; + u8 req_type; + union ack_replies { + struct drm_dp_nak_reply nak; + struct drm_dp_link_address_ack_reply link_addr; + struct drm_dp_port_number_rep port_number; + + struct drm_dp_enum_path_resources_ack_reply path_resources; + struct drm_dp_allocate_payload_ack_reply allocate_payload; + struct drm_dp_query_payload_ack_reply query_payload; + + struct drm_dp_remote_dpcd_read_ack_reply remote_dpcd_read_ack; + struct drm_dp_remote_dpcd_write_ack_reply remote_dpcd_write_ack; + struct drm_dp_remote_dpcd_write_nak_reply remote_dpcd_write_nack; + + struct drm_dp_remote_i2c_read_ack_reply remote_i2c_read_ack; + struct drm_dp_remote_i2c_read_nak_reply remote_i2c_read_nack; + struct drm_dp_remote_i2c_write_ack_reply remote_i2c_write_ack; + } u; +}; + +/* msg is queued to be put into a slot */ +#define DRM_DP_SIDEBAND_TX_QUEUED 0 +/* msg has started transmitting on a slot - still on msgq */ +#define DRM_DP_SIDEBAND_TX_START_SEND 1 +/* msg has finished transmitting on a slot - removed from msgq only in slot */ +#define DRM_DP_SIDEBAND_TX_SENT 2 +/* msg has received a response - removed from slot */ +#define DRM_DP_SIDEBAND_TX_RX 3 +#define DRM_DP_SIDEBAND_TX_TIMEOUT 4 + +struct drm_dp_sideband_msg_tx { + u8 msg[256]; + u8 chunk[48]; + u8 cur_offset; + u8 cur_len; + struct drm_dp_mst_branch *dst; + struct list_head next; + int seqno; + int state; + bool path_msg; + struct drm_dp_sideband_msg_reply_body reply; +}; + +/* sideband msg handler */ +struct drm_dp_mst_topology_mgr; +struct drm_dp_mst_topology_cbs { + /* create a connector for a port */ + struct drm_connector *(*add_connector)(struct drm_dp_mst_topology_mgr *mgr, struct drm_dp_mst_port *port, char *path); + void (*destroy_connector)(struct drm_dp_mst_topology_mgr *mgr, + struct drm_connector *connector); + void (*hotplug)(struct drm_dp_mst_topology_mgr *mgr); + +}; + +#define DP_MAX_PAYLOAD (sizeof(unsigned long) * 8) + +#define DP_PAYLOAD_LOCAL 1 +#define DP_PAYLOAD_REMOTE 2 +#define DP_PAYLOAD_DELETE_LOCAL 3 + +struct drm_dp_payload { + int payload_state; + int start_slot; + int num_slots; +}; + +/** + * struct drm_dp_mst_topology_mgr - DisplayPort MST manager + * @dev: device pointer for adding i2c devices etc. + * @cbs: callbacks for connector addition and destruction. + * @max_dpcd_transaction_bytes - maximum number of bytes to read/write in one go. + * @aux: aux channel for the DP connector. + * @max_payloads: maximum number of payloads the GPU can generate. + * @conn_base_id: DRM connector ID this mgr is connected to. + * @down_rep_recv: msg receiver state for down replies. + * @up_req_recv: msg receiver state for up requests. + * @lock: protects mst state, primary, guid, dpcd. + * @aux_lock: protects aux channel. + * @mst_state: if this manager is enabled for an MST capable port. + * @mst_primary: pointer to the primary branch device. + * @guid_valid: GUID valid for the primary branch device. + * @guid: GUID for primary port. + * @dpcd: cache of DPCD for primary port. + * @pbn_div: PBN to slots divisor. + * + * This struct represents the toplevel displayport MST topology manager. + * There should be one instance of this for every MST capable DP connector + * on the GPU. + */ +struct drm_dp_mst_topology_mgr { + + struct device *dev; + struct drm_dp_mst_topology_cbs *cbs; + int max_dpcd_transaction_bytes; + struct drm_dp_aux *aux; /* auxch for this topology mgr to use */ + int max_payloads; + int conn_base_id; + + /* only ever accessed from the workqueue - which should be serialised */ + struct drm_dp_sideband_msg_rx down_rep_recv; + struct drm_dp_sideband_msg_rx up_req_recv; + + /* pointer to info about the initial MST device */ + struct mutex lock; /* protects mst_state + primary + guid + dpcd */ + + struct mutex aux_lock; /* protect access to the AUX */ + bool mst_state; + struct drm_dp_mst_branch *mst_primary; + /* primary MST device GUID */ + bool guid_valid; + u8 guid[16]; + u8 dpcd[DP_RECEIVER_CAP_SIZE]; + u8 sink_count; + int pbn_div; + int total_slots; + int avail_slots; + int total_pbn; + + /* messages to be transmitted */ + /* qlock protects the upq/downq and in_progress, + the mstb tx_slots and txmsg->state once they are queued */ + struct mutex qlock; + struct list_head tx_msg_downq; + struct list_head tx_msg_upq; + bool tx_down_in_progress; + bool tx_up_in_progress; + + /* payload info + lock for it */ + struct mutex payload_lock; + struct drm_dp_vcpi **proposed_vcpis; + struct drm_dp_payload *payloads; + unsigned long payload_mask; + + wait_queue_head_t tx_waitq; + struct work_struct work; + + struct work_struct tx_work; +}; + +int drm_dp_mst_topology_mgr_init(struct drm_dp_mst_topology_mgr *mgr, struct device *dev, struct drm_dp_aux *aux, int max_dpcd_transaction_bytes, int max_payloads, int conn_base_id); + +void drm_dp_mst_topology_mgr_destroy(struct drm_dp_mst_topology_mgr *mgr); + + +int drm_dp_mst_topology_mgr_set_mst(struct drm_dp_mst_topology_mgr *mgr, bool mst_state); + + +int drm_dp_mst_hpd_irq(struct drm_dp_mst_topology_mgr *mgr, u8 *esi, bool *handled); + + +enum drm_connector_status drm_dp_mst_detect_port(struct drm_dp_mst_topology_mgr *mgr, struct drm_dp_mst_port *port); + +struct edid *drm_dp_mst_get_edid(struct drm_connector *connector, struct drm_dp_mst_topology_mgr *mgr, struct drm_dp_mst_port *port); + + +int drm_dp_calc_pbn_mode(int clock, int bpp); + + +bool drm_dp_mst_allocate_vcpi(struct drm_dp_mst_topology_mgr *mgr, struct drm_dp_mst_port *port, int pbn, int *slots); + + +void drm_dp_mst_reset_vcpi_slots(struct drm_dp_mst_topology_mgr *mgr, struct drm_dp_mst_port *port); + + +void drm_dp_mst_deallocate_vcpi(struct drm_dp_mst_topology_mgr *mgr, + struct drm_dp_mst_port *port); + + +int drm_dp_find_vcpi_slots(struct drm_dp_mst_topology_mgr *mgr, + int pbn); + + +int drm_dp_update_payload_part1(struct drm_dp_mst_topology_mgr *mgr); + + +int drm_dp_update_payload_part2(struct drm_dp_mst_topology_mgr *mgr); + +int drm_dp_check_act_status(struct drm_dp_mst_topology_mgr *mgr); + +void drm_dp_mst_dump_topology(struct seq_file *m, + struct drm_dp_mst_topology_mgr *mgr); + +void drm_dp_mst_topology_mgr_suspend(struct drm_dp_mst_topology_mgr *mgr); +int drm_dp_mst_topology_mgr_resume(struct drm_dp_mst_topology_mgr *mgr); +#endif