| Message ID | 20190604122302.006A168C7B@newverein.lst.de (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | Add anx6345 DP/eDP bridge for Olimex Teres-I | expand |
On 04.06.2019 14:23, Torsten Duwe wrote: > From: Icenowy Zheng <icenowy@aosc.io> > > The ANX6345 is an ultra-low power DisplayPower/eDP transmitter designed > for portable devices. This driver adds initial support for RGB to eDP > mode, without HPD and interrupts. > > This is a configuration usually seen in eDP applications. > > Signed-off-by: Icenowy Zheng <icenowy@aosc.io> > Signed-off-by: Vasily Khoruzhick <anarsoul@gmail.com> > Signed-off-by: Torsten Duwe <duwe@suse.de> > --- > drivers/gpu/drm/bridge/analogix/Kconfig | 12 + > drivers/gpu/drm/bridge/analogix/Makefile | 1 + > drivers/gpu/drm/bridge/analogix/analogix-anx6345.c | 814 +++++++++++++++++++++ > 3 files changed, 827 insertions(+) > create mode 100644 drivers/gpu/drm/bridge/analogix/analogix-anx6345.c > > diff --git a/drivers/gpu/drm/bridge/analogix/Kconfig b/drivers/gpu/drm/bridge/analogix/Kconfig > index 704fb0f41dc3..cd89e238b93e 100644 > --- a/drivers/gpu/drm/bridge/analogix/Kconfig > +++ b/drivers/gpu/drm/bridge/analogix/Kconfig > @@ -1,6 +1,18 @@ > # SPDX-License-Identifier: GPL-2.0-only > +config DRM_ANALOGIX_ANX6345 > + tristate "Analogix ANX6345 bridge" > + select DRM_ANALOGIX_DP > + select DRM_KMS_HELPER > + select REGMAP_I2C > + help > + ANX6345 is an ultra-low Full-HD DisplayPort/eDP > + transmitter designed for portable devices. The > + ANX6345 transforms the LVTTL RGB output of an > + application processor to eDP or DisplayPort. > + > config DRM_ANALOGIX_ANX78XX > tristate "Analogix ANX78XX bridge" > + select DRM_ANALOGIX_DP > select DRM_KMS_HELPER > select REGMAP_I2C > help > diff --git a/drivers/gpu/drm/bridge/analogix/Makefile b/drivers/gpu/drm/bridge/analogix/Makefile > index 7623b9b80167..97669b374098 100644 > --- a/drivers/gpu/drm/bridge/analogix/Makefile > +++ b/drivers/gpu/drm/bridge/analogix/Makefile > @@ -1,4 +1,5 @@ > # SPDX-License-Identifier: GPL-2.0-only > analogix_dp-objs := analogix_dp_core.o analogix_dp_reg.o analogix-i2c-dptx.o > +obj-$(CONFIG_DRM_ANALOGIX_ANX6345) += analogix-anx6345.o > obj-$(CONFIG_DRM_ANALOGIX_ANX78XX) += analogix-anx78xx.o > obj-$(CONFIG_DRM_ANALOGIX_DP) += analogix_dp.o > diff --git a/drivers/gpu/drm/bridge/analogix/analogix-anx6345.c b/drivers/gpu/drm/bridge/analogix/analogix-anx6345.c > new file mode 100644 > index 000000000000..ae222f9f6586 > --- /dev/null > +++ b/drivers/gpu/drm/bridge/analogix/analogix-anx6345.c > @@ -0,0 +1,814 @@ > +/* > + * Copyright(c) 2016, Analogix Semiconductor. > + * Copyright(c) 2017, Icenowy Zheng <icenowy@aosc.io> > + * > + * This program is free software; you can redistribute it and/or modify > + * it under the terms of the GNU General Public License version 2 and > + * only version 2 as published by the Free Software Foundation. > + * > + * This program is distributed in the hope that it will be useful, > + * but WITHOUT ANY WARRANTY; without even the implied warranty of > + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the > + * GNU General Public License for more details. SPDX > + * > + * Based on anx7808 driver obtained from chromeos with copyright: > + * Copyright(c) 2013, Google Inc. > + * > + */ > +#include <linux/delay.h> > +#include <linux/err.h> > +#include <linux/gpio/consumer.h> > +#include <linux/i2c.h> > +#include <linux/interrupt.h> > +#include <linux/kernel.h> > +#include <linux/module.h> > +#include <linux/of_platform.h> > +#include <linux/regmap.h> > +#include <linux/regulator/consumer.h> > +#include <linux/types.h> > + > +#include <drm/drm_atomic_helper.h> > +#include <drm/drm_crtc.h> > +#include <drm/drm_crtc_helper.h> > +#include <drm/drm_dp_helper.h> > +#include <drm/drm_edid.h> > +#include <drm/drm_of.h> > +#include <drm/drm_panel.h> > +#include <drm/drm_print.h> > +#include <drm/drm_probe_helper.h> > + > +#include "analogix-i2c-dptx.h" > +#include "analogix-i2c-txcommon.h" > + > +#define I2C_NUM_ADDRESSES 2 You can define it as ARRAY_SIZE(anx6345_i2c_addresses) - more generic. > +#define I2C_IDX_DPTX 0 > +#define I2C_IDX_TXCOM 1 > + > +#define POLL_DELAY 50000 /* us */ > +#define POLL_TIMEOUT 5000000 /* us */ > + > +static const u8 anx6345_i2c_addresses[] = { > + [I2C_IDX_DPTX] = ANALOGIX_I2C_DPTX, > + [I2C_IDX_TXCOM] = ANALOGIX_I2C_TXCOMMON, > +}; > + > +struct anx6345 { > + struct drm_dp_aux aux; > + struct drm_bridge bridge; > + struct i2c_client *client; > + struct edid *edid; > + struct drm_connector connector; > + struct drm_dp_link link; > + struct drm_panel *panel; > + struct regulator *dvdd12; > + struct regulator *dvdd25; > + struct gpio_desc *gpiod_reset; > + struct mutex lock; /* protect EDID access */ > + > + /* I2C Slave addresses of ANX6345 are mapped as DPTX and SYS */ > + struct i2c_client *i2c_clients[I2C_NUM_ADDRESSES]; > + struct regmap *map[I2C_NUM_ADDRESSES]; > + > + u16 chipid; > + u8 dpcd[DP_RECEIVER_CAP_SIZE]; > + > + bool powered; > +}; > + > +static inline struct anx6345 *connector_to_anx6345(struct drm_connector *c) > +{ > + return container_of(c, struct anx6345, connector); > +} > + > +static inline struct anx6345 *bridge_to_anx6345(struct drm_bridge *bridge) > +{ > + return container_of(bridge, struct anx6345, bridge); > +} > + > +static int anx6345_set_bits(struct regmap *map, u8 reg, u8 mask) > +{ > + return regmap_update_bits(map, reg, mask, mask); > +} > + > +static int anx6345_clear_bits(struct regmap *map, u8 reg, u8 mask) > +{ > + return regmap_update_bits(map, reg, mask, 0); > +} > + > +static ssize_t anx6345_aux_transfer(struct drm_dp_aux *aux, > + struct drm_dp_aux_msg *msg) > +{ > + struct anx6345 *anx6345 = container_of(aux, struct anx6345, aux); > + > + return anx_dp_aux_transfer(anx6345->map[I2C_IDX_DPTX], msg); > +} > + > +static int anx6345_dp_link_training(struct anx6345 *anx6345) > +{ > + unsigned int value; > + u8 dp_bw; > + int err; > + > + err = anx6345_clear_bits(anx6345->map[I2C_IDX_TXCOM], > + SP_POWERDOWN_CTRL_REG, > + SP_TOTAL_PD); > + if (err) > + return err; > + > + err = drm_dp_dpcd_readb(&anx6345->aux, DP_MAX_LINK_RATE, &dp_bw); > + if (err < 0) > + return err; > + > + switch (dp_bw) { > + case DP_LINK_BW_1_62: > + case DP_LINK_BW_2_7: > + break; > + > + default: > + DRM_DEBUG_KMS("DP bandwidth (%#02x) not supported\n", dp_bw); > + return -EINVAL; > + } > + > + err = anx6345_set_bits(anx6345->map[I2C_IDX_TXCOM], SP_VID_CTRL1_REG, > + SP_VIDEO_MUTE); > + if (err) > + return err; > + > + err = anx6345_clear_bits(anx6345->map[I2C_IDX_TXCOM], > + SP_VID_CTRL1_REG, SP_VIDEO_EN); > + if (err) > + return err; > + > + /* Get DPCD info */ > + err = drm_dp_dpcd_read(&anx6345->aux, DP_DPCD_REV, > + &anx6345->dpcd, DP_RECEIVER_CAP_SIZE); > + if (err < 0) { > + DRM_ERROR("Failed to read DPCD: %d\n", err); > + return err; > + } > + > + /* Clear channel x SERDES power down */ > + err = anx6345_clear_bits(anx6345->map[I2C_IDX_DPTX], > + SP_DP_ANALOG_POWER_DOWN_REG, SP_CH0_PD); > + if (err) > + return err; > + > + /* Check link capabilities */ > + err = drm_dp_link_probe(&anx6345->aux, &anx6345->link); > + if (err < 0) { > + DRM_ERROR("Failed to probe link capabilities: %d\n", err); > + return err; > + } > + > + /* Power up the sink */ > + err = drm_dp_link_power_up(&anx6345->aux, &anx6345->link); > + if (err < 0) { > + DRM_ERROR("Failed to power up DisplayPort link: %d\n", err); > + return err; > + } > + > + /* Possibly enable downspread on the sink */ > + err = regmap_write(anx6345->map[I2C_IDX_DPTX], > + SP_DP_DOWNSPREAD_CTRL1_REG, 0); > + if (err) > + return err; > + > + if (anx6345->dpcd[DP_MAX_DOWNSPREAD] & DP_MAX_DOWNSPREAD_0_5) { > + DRM_DEBUG("Enable downspread on the sink\n"); > + /* 4000PPM */ > + err = regmap_write(anx6345->map[I2C_IDX_DPTX], > + SP_DP_DOWNSPREAD_CTRL1_REG, 8); > + if (err) > + return err; > + > + err = drm_dp_dpcd_writeb(&anx6345->aux, DP_DOWNSPREAD_CTRL, > + DP_SPREAD_AMP_0_5); > + if (err < 0) > + return err; > + } else { > + err = drm_dp_dpcd_writeb(&anx6345->aux, DP_DOWNSPREAD_CTRL, 0); > + if (err < 0) > + return err; > + } > + > + /* Set the lane count and the link rate on the sink */ > + if (drm_dp_enhanced_frame_cap(anx6345->dpcd)) > + err = anx6345_set_bits(anx6345->map[I2C_IDX_DPTX], > + SP_DP_SYSTEM_CTRL_BASE + 4, > + SP_ENHANCED_MODE); > + else > + err = anx6345_clear_bits(anx6345->map[I2C_IDX_DPTX], > + SP_DP_SYSTEM_CTRL_BASE + 4, > + SP_ENHANCED_MODE); > + if (err) > + return err; > + > + value = drm_dp_link_rate_to_bw_code(anx6345->link.rate); > + err = regmap_write(anx6345->map[I2C_IDX_DPTX], > + SP_DP_MAIN_LINK_BW_SET_REG, value); > + if (err) > + return err; > + > + err = regmap_write(anx6345->map[I2C_IDX_DPTX], > + SP_DP_LANE_COUNT_SET_REG, anx6345->link.num_lanes); > + if (err) > + return err; > + > + err = drm_dp_link_configure(&anx6345->aux, &anx6345->link); > + if (err < 0) { > + DRM_ERROR("Failed to configure DisplayPort link: %d\n", err); > + return err; > + } > + > + /* Start training on the source */ > + err = regmap_write(anx6345->map[I2C_IDX_DPTX], SP_DP_LT_CTRL_REG, > + SP_LT_EN); > + if (err) > + return err; > + > + err = regmap_read_poll_timeout(anx6345->map[I2C_IDX_DPTX], > + SP_DP_LT_CTRL_REG, > + value, !(value & SP_DP_LT_INPROGRESS), > + POLL_DELAY, POLL_TIMEOUT); > + if (err) > + return err; > + > + return 0; You can use: return regmap_read_poll_timeout(....); > +} > + > +static int anx6345_tx_initialization(struct anx6345 *anx6345) > +{ > + int err, i; > + > + /* FIXME: colordepth is hardcoded for now */ > + err = regmap_write(anx6345->map[I2C_IDX_TXCOM], SP_VID_CTRL2_REG, > + SP_IN_BPC_6BIT << SP_IN_BPC_SHIFT); > + if (err) > + return err; > + > + err = regmap_write(anx6345->map[I2C_IDX_DPTX], SP_DP_PLL_CTRL_REG, 0); > + if (err) > + return err; > + > + err = regmap_write(anx6345->map[I2C_IDX_TXCOM], > + SP_ANALOG_DEBUG1_REG, 0); > + if (err) > + return err; > + > + err = regmap_write(anx6345->map[I2C_IDX_DPTX], > + SP_DP_LINK_DEBUG_CTRL_REG, > + SP_NEW_PRBS7 | SP_M_VID_DEBUG); > + if (err) > + return err; > + > + err = regmap_write(anx6345->map[I2C_IDX_DPTX], > + SP_DP_ANALOG_POWER_DOWN_REG, 0); > + if (err) > + return err; > + > + /* Force HPD */ > + err = anx6345_set_bits(anx6345->map[I2C_IDX_DPTX], > + SP_DP_SYSTEM_CTRL_BASE + 3, > + SP_HPD_FORCE | SP_HPD_CTRL); > + if (err) > + return err; > + > + for (i = 0; i < 4; i++) { > + /* 4 lanes */ > + err = regmap_write(anx6345->map[I2C_IDX_DPTX], > + SP_DP_LANE0_LT_CTRL_REG + i, 0); > + if (err) > + return err; > + } > + > + /* Reset AUX */ > + err = anx6345_set_bits(anx6345->map[I2C_IDX_TXCOM], > + SP_RESET_CTRL2_REG, SP_AUX_RST); > + if (err) > + return err; > + > + err = anx6345_clear_bits(anx6345->map[I2C_IDX_TXCOM], > + SP_RESET_CTRL2_REG, SP_AUX_RST); > + if (err) > + return err; > + > + return 0; ditto > +} > + > +static void anx6345_poweron(struct anx6345 *anx6345) > +{ > + int err; > + > + /* Ensure reset is asserted before starting power on sequence */ > + gpiod_set_value_cansleep(anx6345->gpiod_reset, 1); With fixed devm_gpiod_get below this line can be removed. > + usleep_range(1000, 2000); > + > + err = regulator_enable(anx6345->dvdd12); > + if (err) { > + DRM_ERROR("Failed to enable dvdd12 regulator: %d\n", > + err); > + return; > + } > + > + /* T1 - delay between VDD12 and VDD25 should be 0-2ms */ > + usleep_range(1000, 2000); > + > + err = regulator_enable(anx6345->dvdd25); > + if (err) { > + DRM_ERROR("Failed to enable dvdd25 regulator: %d\n", > + err); > + return; > + } > + > + /* T2 - delay between RESETN and all power rail stable, > + * should be 2-5ms > + */ > + usleep_range(2000, 5000); > + > + gpiod_set_value_cansleep(anx6345->gpiod_reset, 0); > + > + /* Power on registers module */ > + anx6345_set_bits(anx6345->map[I2C_IDX_TXCOM], SP_POWERDOWN_CTRL_REG, > + SP_HDCP_PD | SP_AUDIO_PD | SP_VIDEO_PD | SP_LINK_PD); > + anx6345_clear_bits(anx6345->map[I2C_IDX_TXCOM], SP_POWERDOWN_CTRL_REG, > + SP_REGISTER_PD | SP_TOTAL_PD); > + > + if (anx6345->panel) > + drm_panel_prepare(anx6345->panel); > + > + anx6345->powered = true; > +} > + > +static void anx6345_poweroff(struct anx6345 *anx6345) > +{ > + int err; > + > + gpiod_set_value_cansleep(anx6345->gpiod_reset, 1); > + usleep_range(1000, 2000); > + > + if (anx6345->panel) > + drm_panel_unprepare(anx6345->panel); > + > + err = regulator_disable(anx6345->dvdd25); > + if (err) { > + DRM_ERROR("Failed to disable dvdd25 regulator: %d\n", > + err); > + return; > + } > + > + usleep_range(5000, 10000); > + > + err = regulator_disable(anx6345->dvdd12); > + if (err) { > + DRM_ERROR("Failed to disable dvdd12 regulator: %d\n", > + err); > + return; > + } > + > + usleep_range(1000, 2000); > + > + anx6345->powered = false; > +} > + > +static int anx6345_start(struct anx6345 *anx6345) > +{ > + int err; > + > + if (!anx6345->powered) > + anx6345_poweron(anx6345); > + > + /* Power on needed modules */ > + err = anx6345_clear_bits(anx6345->map[I2C_IDX_TXCOM], > + SP_POWERDOWN_CTRL_REG, > + SP_VIDEO_PD | SP_LINK_PD); > + > + err = anx6345_tx_initialization(anx6345); > + if (err) { > + DRM_ERROR("Failed eDP transmitter initialization: %d\n", err); > + anx6345_poweroff(anx6345); > + return err; > + } > + > + err = anx6345_dp_link_training(anx6345); > + if (err) { > + DRM_ERROR("Failed link training: %d\n", err); > + anx6345_poweroff(anx6345); > + return err; > + } > + > + /* > + * This delay seems to help keep the hardware in a good state. Without > + * it, there are times where it fails silently. > + */ > + usleep_range(10000, 15000); > + > + return 0; > +} > + > +static int anx6345_config_dp_output(struct anx6345 *anx6345) > +{ > + int err; > + > + err = anx6345_clear_bits(anx6345->map[I2C_IDX_TXCOM], SP_VID_CTRL1_REG, > + SP_VIDEO_MUTE); > + if (err) > + return err; > + > + /* Enable DP output */ > + err = anx6345_set_bits(anx6345->map[I2C_IDX_TXCOM], SP_VID_CTRL1_REG, > + SP_VIDEO_EN); > + if (err) > + return err; > + > + /* Force stream valid */ > + err = anx6345_set_bits(anx6345->map[I2C_IDX_DPTX], > + SP_DP_SYSTEM_CTRL_BASE + 3, > + SP_STRM_FORCE | SP_STRM_CTRL); > + if (err) > + return err; > + > + return 0; > +} > + > +static int anx6345_get_downstream_info(struct anx6345 *anx6345) > +{ > + u8 value; > + int err; > + > + err = drm_dp_dpcd_readb(&anx6345->aux, DP_SINK_COUNT, &value); > + if (err < 0) { > + DRM_ERROR("Get sink count failed %d\n", err); > + return err; > + } > + > + if (!DP_GET_SINK_COUNT(value)) { > + DRM_ERROR("Downstream disconnected\n"); > + return -EIO; > + } > + > + return 0; > +} > + > +static int anx6345_get_modes(struct drm_connector *connector) > +{ > + struct anx6345 *anx6345 = connector_to_anx6345(connector); > + int err, num_modes = 0; > + bool power_off = false; > + > + mutex_lock(&anx6345->lock); > + > + if (!anx6345->edid) { > + if (!anx6345->powered) { > + anx6345_poweron(anx6345); > + power_off = true; > + } > + > + err = anx6345_get_downstream_info(anx6345); > + if (err) { > + DRM_ERROR("Failed to get downstream info: %d\n", err); > + goto unlock; > + } > + > + anx6345->edid = drm_get_edid(connector, &anx6345->aux.ddc); > + if (!anx6345->edid) > + DRM_ERROR("Failed to read EDID from panel\n"); > + > + err = drm_connector_update_edid_property(connector, > + anx6345->edid); > + if (err) { > + DRM_ERROR("Failed to update EDID property: %d\n", err); > + goto unlock; > + } > + } > + > + num_modes += drm_add_edid_modes(connector, anx6345->edid); > + > +unlock: > + if (power_off) > + anx6345_poweroff(anx6345); > + > + mutex_unlock(&anx6345->lock); > + > + if (!num_modes && anx6345->panel) > + num_modes += drm_panel_get_modes(anx6345->panel); > + > + return num_modes; > +} > + > +static const struct drm_connector_helper_funcs anx6345_connector_helper_funcs = { > + .get_modes = anx6345_get_modes, > +}; > + > +static void > +anx6345_connector_destroy(struct drm_connector *connector) > +{ > + struct anx6345 *anx6345 = connector_to_anx6345(connector); > + > + if (anx6345->panel) > + drm_panel_detach(anx6345->panel); > + drm_connector_cleanup(connector); > +} > + > +static const struct drm_connector_funcs anx6345_connector_funcs = { > + .fill_modes = drm_helper_probe_single_connector_modes, > + .destroy = anx6345_connector_destroy, > + .reset = drm_atomic_helper_connector_reset, > + .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state, > + .atomic_destroy_state = drm_atomic_helper_connector_destroy_state, > +}; > + > +static int anx6345_bridge_attach(struct drm_bridge *bridge) > +{ > + struct anx6345 *anx6345 = bridge_to_anx6345(bridge); > + int err; > + > + if (!bridge->encoder) { > + DRM_ERROR("Parent encoder object not found"); > + return -ENODEV; > + } > + > + /* Register aux channel */ > + anx6345->aux.name = "DP-AUX"; > + anx6345->aux.dev = &anx6345->client->dev; > + anx6345->aux.transfer = anx6345_aux_transfer; > + > + err = drm_dp_aux_register(&anx6345->aux); > + if (err < 0) { > + DRM_ERROR("Failed to register aux channel: %d\n", err); > + return err; > + } > + > + err = drm_connector_init(bridge->dev, &anx6345->connector, > + &anx6345_connector_funcs, > + DRM_MODE_CONNECTOR_eDP); > + if (err) { > + DRM_ERROR("Failed to initialize connector: %d\n", err); > + return err; > + } > + > + drm_connector_helper_add(&anx6345->connector, > + &anx6345_connector_helper_funcs); > + > + err = drm_connector_register(&anx6345->connector); > + if (err) { > + DRM_ERROR("Failed to register connector: %d\n", err); > + return err; > + } > + > + anx6345->connector.polled = DRM_CONNECTOR_POLL_HPD; > + > + err = drm_connector_attach_encoder(&anx6345->connector, > + bridge->encoder); > + if (err) { > + DRM_ERROR("Failed to link up connector to encoder: %d\n", err); > + return err; > + } > + > + if (anx6345->panel) { > + err = drm_panel_attach(anx6345->panel, &anx6345->connector); > + if (err) { > + DRM_ERROR("Failed to attach panel: %d\n", err); > + return err; > + } > + } > + > + return 0; > +} > + > +static enum drm_mode_status > +anx6345_bridge_mode_valid(struct drm_bridge *bridge, > + const struct drm_display_mode *mode) > +{ > + if (mode->flags & DRM_MODE_FLAG_INTERLACE) > + return MODE_NO_INTERLACE; > + > + /* Max 1200p at 5.4 Ghz, one lane */ > + if (mode->clock > 154000) > + return MODE_CLOCK_HIGH; I wonder if you shouldn't take into account training results here, ie. training perfrormed before validation. > + > + return MODE_OK; > +} > + > +static void anx6345_bridge_disable(struct drm_bridge *bridge) > +{ > + struct anx6345 *anx6345 = bridge_to_anx6345(bridge); > + > + /* Power off all modules except configuration registers access */ > + anx6345_set_bits(anx6345->map[I2C_IDX_TXCOM], SP_POWERDOWN_CTRL_REG, > + SP_HDCP_PD | SP_AUDIO_PD | SP_VIDEO_PD | SP_LINK_PD); > + if (anx6345->panel) > + drm_panel_disable(anx6345->panel); > + > + if (anx6345->powered) > + anx6345_poweroff(anx6345); > +} > + > +static void anx6345_bridge_enable(struct drm_bridge *bridge) > +{ > + struct anx6345 *anx6345 = bridge_to_anx6345(bridge); > + int err; > + > + if (anx6345->panel) > + drm_panel_enable(anx6345->panel); > + > + err = anx6345_start(anx6345); > + if (err) { > + DRM_ERROR("Failed to initialize: %d\n", err); > + return; > + } > + > + err = anx6345_config_dp_output(anx6345); > + if (err) > + DRM_ERROR("Failed to enable DP output: %d\n", err); > +} > + > +static const struct drm_bridge_funcs anx6345_bridge_funcs = { > + .attach = anx6345_bridge_attach, > + .mode_valid = anx6345_bridge_mode_valid, > + .disable = anx6345_bridge_disable, > + .enable = anx6345_bridge_enable, > +}; > + > +static void unregister_i2c_dummy_clients(struct anx6345 *anx6345) > +{ > + unsigned int i; > + > + for (i = 1; i < ARRAY_SIZE(anx6345->i2c_clients); i++) > + if (anx6345->i2c_clients[i] && > + anx6345->i2c_clients[i]->addr != anx6345->client->addr) > + i2c_unregister_device(anx6345->i2c_clients[i]); > +} > + > +static const struct regmap_config anx6345_regmap_config = { > + .reg_bits = 8, > + .val_bits = 8, > + .max_register = 0xff, > + .cache_type = REGCACHE_NONE, > +}; > + > +static const u16 anx6345_chipid_list[] = { > + 0x6345, > +}; > + > +static bool anx6345_get_chip_id(struct anx6345 *anx6345) > +{ > + unsigned int i, idl, idh, version; > + > + if (regmap_read(anx6345->map[I2C_IDX_TXCOM], SP_DEVICE_IDL_REG, &idl)) > + return false; > + > + if (regmap_read(anx6345->map[I2C_IDX_TXCOM], SP_DEVICE_IDH_REG, &idh)) > + return false; > + > + anx6345->chipid = (u8)idl | ((u8)idh << 8); > + > + if (regmap_read(anx6345->map[I2C_IDX_TXCOM], SP_DEVICE_VERSION_REG, > + &version)) > + return false; > + > + for (i = 0; i < ARRAY_SIZE(anx6345_chipid_list); i++) { > + if (anx6345->chipid == anx6345_chipid_list[i]) { > + DRM_INFO("Found ANX%x (ver. %d) eDP Transmitter\n", > + anx6345->chipid, version); > + return true; > + } > + } > + > + DRM_ERROR("ANX%x (ver. %d) not supported by this driver\n", > + anx6345->chipid, version); > + > + return false; > +} > + > +static int anx6345_i2c_probe(struct i2c_client *client, > + const struct i2c_device_id *id) > +{ > + struct anx6345 *anx6345; > + struct device *dev; > + int i, err; > + > + anx6345 = devm_kzalloc(&client->dev, sizeof(*anx6345), GFP_KERNEL); > + if (!anx6345) > + return -ENOMEM; > + > + mutex_init(&anx6345->lock); > + > + anx6345->bridge.of_node = client->dev.of_node; > + > + anx6345->client = client; > + i2c_set_clientdata(client, anx6345); > + > + dev = &anx6345->client->dev; > + > + err = drm_of_find_panel_or_bridge(client->dev.of_node, 1, 0, > + &anx6345->panel, NULL); > + if (err == -EPROBE_DEFER) > + return err; > + > + if (err) > + DRM_DEBUG("No panel found\n"); > + > + /* 1.2V digital core power regulator */ > + anx6345->dvdd12 = devm_regulator_get(dev, "dvdd12-supply"); > + if (IS_ERR(anx6345->dvdd12)) { > + DRM_ERROR("dvdd12-supply not found\n"); > + return PTR_ERR(anx6345->dvdd12); > + } > + > + /* 2.5V digital core power regulator */ > + anx6345->dvdd25 = devm_regulator_get(dev, "dvdd25-supply"); > + if (IS_ERR(anx6345->dvdd25)) { > + DRM_ERROR("dvdd25-supply not found\n"); > + return PTR_ERR(anx6345->dvdd25); > + } > + > + /* GPIO for chip reset */ > + anx6345->gpiod_reset = devm_gpiod_get(dev, "reset", GPIOD_OUT_LOW); Shouldn't be set to GPIOD_OUT_HIGH? > + if (IS_ERR(anx6345->gpiod_reset)) { > + DRM_ERROR("Reset gpio not found\n"); > + return PTR_ERR(anx6345->gpiod_reset); > + } > + > + /* Map slave addresses of ANX6345 */ > + for (i = 0; i < I2C_NUM_ADDRESSES; i++) { > + if (anx6345_i2c_addresses[i] >> 1 != client->addr) > + anx6345->i2c_clients[i] = i2c_new_dummy(client->adapter, > + anx6345_i2c_addresses[i] >> 1); > + else > + anx6345->i2c_clients[i] = client; > + > + if (!anx6345->i2c_clients[i]) { > + err = -ENOMEM; > + DRM_ERROR("Failed to reserve I2C bus %02x\n", > + anx6345_i2c_addresses[i]); > + goto err_unregister_i2c; > + } > + > + anx6345->map[i] = devm_regmap_init_i2c(anx6345->i2c_clients[i], > + &anx6345_regmap_config); > + if (IS_ERR(anx6345->map[i])) { > + err = PTR_ERR(anx6345->map[i]); > + DRM_ERROR("Failed regmap initialization %02x\n", > + anx6345_i2c_addresses[i]); > + goto err_unregister_i2c; > + } > + } > + > + /* Look for supported chip ID */ > + anx6345_poweron(anx6345); > + if (anx6345_get_chip_id(anx6345)) { > + anx6345->bridge.funcs = &anx6345_bridge_funcs; > + drm_bridge_add(&anx6345->bridge); > + > + return 0; > + } else { > + anx6345_poweroff(anx6345); > + err = -ENODEV; > + } > + > +err_unregister_i2c: > + unregister_i2c_dummy_clients(anx6345); > + return err; > +} > + > +static int anx6345_i2c_remove(struct i2c_client *client) > +{ > + struct anx6345 *anx6345 = i2c_get_clientdata(client); > + > + drm_bridge_remove(&anx6345->bridge); > + > + unregister_i2c_dummy_clients(anx6345); > + > + kfree(anx6345->edid); > + > + mutex_destroy(&anx6345->lock); > + > + return 0; > +} > + > +static const struct i2c_device_id anx6345_id[] = { > + { "anx6345", 0 }, > + { /* sentinel */ } > +}; > +MODULE_DEVICE_TABLE(i2c, anx6345_id); > + > +static const struct of_device_id anx6345_match_table[] = { > + { .compatible = "analogix,anx6345", }, > + { /* sentinel */ }, > +}; > +MODULE_DEVICE_TABLE(of, anx6345_match_table); > + > +static struct i2c_driver anx6345_driver = { > + .driver = { > + .name = "anx6345", > + .of_match_table = of_match_ptr(anx6345_match_table), > + }, > + .probe = anx6345_i2c_probe, > + .remove = anx6345_i2c_remove, > + .id_table = anx6345_id, > +}; > +module_i2c_driver(anx6345_driver); > + > +MODULE_DESCRIPTION("ANX6345 eDP Transmitter driver"); > +MODULE_AUTHOR("Enric Balletbo i Serra <enric.balletbo@collabora.com>"); Submitter, patch author, and module author are different, this can be correct, but maybe somebody forgot to update some of these fields. Regards Andrzej > +MODULE_LICENSE("GPL v2");
On Wed, Jun 12, 2019 at 11:13:10AM +0200, Andrzej Hajda wrote: > On 04.06.2019 14:23, Torsten Duwe wrote: > > + > > +static void anx6345_poweron(struct anx6345 *anx6345) > > +{ > > + int err; > > + > > + /* Ensure reset is asserted before starting power on sequence */ > > + gpiod_set_value_cansleep(anx6345->gpiod_reset, 1); > > With fixed devm_gpiod_get below this line can be removed. In any case, reset must be asserted for this procedure to succeed... > > +static enum drm_mode_status > > +anx6345_bridge_mode_valid(struct drm_bridge *bridge, > > + const struct drm_display_mode *mode) > > +{ > > + if (mode->flags & DRM_MODE_FLAG_INTERLACE) > > + return MODE_NO_INTERLACE; > > + > > + /* Max 1200p at 5.4 Ghz, one lane */ > > + if (mode->clock > 154000) > > + return MODE_CLOCK_HIGH; > > I wonder if you shouldn't take into account training results here, ie. > training perfrormed before validation. Sure, but this is verbatim from the anx78xx.c sibling, code provided by analogix. Lacking in-depth datasheets, this is probably the best effort. > > + > > + /* 2.5V digital core power regulator */ > > + anx6345->dvdd25 = devm_regulator_get(dev, "dvdd25-supply"); > > + if (IS_ERR(anx6345->dvdd25)) { > > + DRM_ERROR("dvdd25-supply not found\n"); > > + return PTR_ERR(anx6345->dvdd25); > > + } > > + > > + /* GPIO for chip reset */ > > + anx6345->gpiod_reset = devm_gpiod_get(dev, "reset", GPIOD_OUT_LOW); > > Shouldn't be set to GPIOD_OUT_HIGH? It used to be in the original submission, and confused even more people ;-) Fact is, the reset for this chip _is_ low active; I'm following Documentation/devicetree/bindings/gpio/gpio.txt, "1.1) GPIO specifier best practices", which I find rather comprehensive. Any suggestions on how to phrase this even better are appreciated. > > +}; > > +module_i2c_driver(anx6345_driver); > > + > > +MODULE_DESCRIPTION("ANX6345 eDP Transmitter driver"); > > +MODULE_AUTHOR("Enric Balletbo i Serra <enric.balletbo@collabora.com>"); > > Submitter, patch author, and module author are different, this can be > correct, but maybe somebody forgot to update some of these fields. As mentioned in the v2 cover letter, I had a closer look on which code got actually introduced and which lines were simply copied around, and made the copyright and authorship stick to where they belong. *I* believe this is correct now; specific improvements welcome. Torsten
diff --git a/drivers/gpu/drm/bridge/analogix/Kconfig b/drivers/gpu/drm/bridge/analogix/Kconfig index 704fb0f41dc3..cd89e238b93e 100644 --- a/drivers/gpu/drm/bridge/analogix/Kconfig +++ b/drivers/gpu/drm/bridge/analogix/Kconfig @@ -1,6 +1,18 @@ # SPDX-License-Identifier: GPL-2.0-only +config DRM_ANALOGIX_ANX6345 + tristate "Analogix ANX6345 bridge" + select DRM_ANALOGIX_DP + select DRM_KMS_HELPER + select REGMAP_I2C + help + ANX6345 is an ultra-low Full-HD DisplayPort/eDP + transmitter designed for portable devices. The + ANX6345 transforms the LVTTL RGB output of an + application processor to eDP or DisplayPort. + config DRM_ANALOGIX_ANX78XX tristate "Analogix ANX78XX bridge" + select DRM_ANALOGIX_DP select DRM_KMS_HELPER select REGMAP_I2C help diff --git a/drivers/gpu/drm/bridge/analogix/Makefile b/drivers/gpu/drm/bridge/analogix/Makefile index 7623b9b80167..97669b374098 100644 --- a/drivers/gpu/drm/bridge/analogix/Makefile +++ b/drivers/gpu/drm/bridge/analogix/Makefile @@ -1,4 +1,5 @@ # SPDX-License-Identifier: GPL-2.0-only analogix_dp-objs := analogix_dp_core.o analogix_dp_reg.o analogix-i2c-dptx.o +obj-$(CONFIG_DRM_ANALOGIX_ANX6345) += analogix-anx6345.o obj-$(CONFIG_DRM_ANALOGIX_ANX78XX) += analogix-anx78xx.o obj-$(CONFIG_DRM_ANALOGIX_DP) += analogix_dp.o diff --git a/drivers/gpu/drm/bridge/analogix/analogix-anx6345.c b/drivers/gpu/drm/bridge/analogix/analogix-anx6345.c new file mode 100644 index 000000000000..ae222f9f6586 --- /dev/null +++ b/drivers/gpu/drm/bridge/analogix/analogix-anx6345.c @@ -0,0 +1,814 @@ +/* + * Copyright(c) 2016, Analogix Semiconductor. + * Copyright(c) 2017, Icenowy Zheng <icenowy@aosc.io> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 and + * only version 2 as published by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * Based on anx7808 driver obtained from chromeos with copyright: + * Copyright(c) 2013, Google Inc. + * + */ +#include <linux/delay.h> +#include <linux/err.h> +#include <linux/gpio/consumer.h> +#include <linux/i2c.h> +#include <linux/interrupt.h> +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/of_platform.h> +#include <linux/regmap.h> +#include <linux/regulator/consumer.h> +#include <linux/types.h> + +#include <drm/drm_atomic_helper.h> +#include <drm/drm_crtc.h> +#include <drm/drm_crtc_helper.h> +#include <drm/drm_dp_helper.h> +#include <drm/drm_edid.h> +#include <drm/drm_of.h> +#include <drm/drm_panel.h> +#include <drm/drm_print.h> +#include <drm/drm_probe_helper.h> + +#include "analogix-i2c-dptx.h" +#include "analogix-i2c-txcommon.h" + +#define I2C_NUM_ADDRESSES 2 +#define I2C_IDX_DPTX 0 +#define I2C_IDX_TXCOM 1 + +#define POLL_DELAY 50000 /* us */ +#define POLL_TIMEOUT 5000000 /* us */ + +static const u8 anx6345_i2c_addresses[] = { + [I2C_IDX_DPTX] = ANALOGIX_I2C_DPTX, + [I2C_IDX_TXCOM] = ANALOGIX_I2C_TXCOMMON, +}; + +struct anx6345 { + struct drm_dp_aux aux; + struct drm_bridge bridge; + struct i2c_client *client; + struct edid *edid; + struct drm_connector connector; + struct drm_dp_link link; + struct drm_panel *panel; + struct regulator *dvdd12; + struct regulator *dvdd25; + struct gpio_desc *gpiod_reset; + struct mutex lock; /* protect EDID access */ + + /* I2C Slave addresses of ANX6345 are mapped as DPTX and SYS */ + struct i2c_client *i2c_clients[I2C_NUM_ADDRESSES]; + struct regmap *map[I2C_NUM_ADDRESSES]; + + u16 chipid; + u8 dpcd[DP_RECEIVER_CAP_SIZE]; + + bool powered; +}; + +static inline struct anx6345 *connector_to_anx6345(struct drm_connector *c) +{ + return container_of(c, struct anx6345, connector); +} + +static inline struct anx6345 *bridge_to_anx6345(struct drm_bridge *bridge) +{ + return container_of(bridge, struct anx6345, bridge); +} + +static int anx6345_set_bits(struct regmap *map, u8 reg, u8 mask) +{ + return regmap_update_bits(map, reg, mask, mask); +} + +static int anx6345_clear_bits(struct regmap *map, u8 reg, u8 mask) +{ + return regmap_update_bits(map, reg, mask, 0); +} + +static ssize_t anx6345_aux_transfer(struct drm_dp_aux *aux, + struct drm_dp_aux_msg *msg) +{ + struct anx6345 *anx6345 = container_of(aux, struct anx6345, aux); + + return anx_dp_aux_transfer(anx6345->map[I2C_IDX_DPTX], msg); +} + +static int anx6345_dp_link_training(struct anx6345 *anx6345) +{ + unsigned int value; + u8 dp_bw; + int err; + + err = anx6345_clear_bits(anx6345->map[I2C_IDX_TXCOM], + SP_POWERDOWN_CTRL_REG, + SP_TOTAL_PD); + if (err) + return err; + + err = drm_dp_dpcd_readb(&anx6345->aux, DP_MAX_LINK_RATE, &dp_bw); + if (err < 0) + return err; + + switch (dp_bw) { + case DP_LINK_BW_1_62: + case DP_LINK_BW_2_7: + break; + + default: + DRM_DEBUG_KMS("DP bandwidth (%#02x) not supported\n", dp_bw); + return -EINVAL; + } + + err = anx6345_set_bits(anx6345->map[I2C_IDX_TXCOM], SP_VID_CTRL1_REG, + SP_VIDEO_MUTE); + if (err) + return err; + + err = anx6345_clear_bits(anx6345->map[I2C_IDX_TXCOM], + SP_VID_CTRL1_REG, SP_VIDEO_EN); + if (err) + return err; + + /* Get DPCD info */ + err = drm_dp_dpcd_read(&anx6345->aux, DP_DPCD_REV, + &anx6345->dpcd, DP_RECEIVER_CAP_SIZE); + if (err < 0) { + DRM_ERROR("Failed to read DPCD: %d\n", err); + return err; + } + + /* Clear channel x SERDES power down */ + err = anx6345_clear_bits(anx6345->map[I2C_IDX_DPTX], + SP_DP_ANALOG_POWER_DOWN_REG, SP_CH0_PD); + if (err) + return err; + + /* Check link capabilities */ + err = drm_dp_link_probe(&anx6345->aux, &anx6345->link); + if (err < 0) { + DRM_ERROR("Failed to probe link capabilities: %d\n", err); + return err; + } + + /* Power up the sink */ + err = drm_dp_link_power_up(&anx6345->aux, &anx6345->link); + if (err < 0) { + DRM_ERROR("Failed to power up DisplayPort link: %d\n", err); + return err; + } + + /* Possibly enable downspread on the sink */ + err = regmap_write(anx6345->map[I2C_IDX_DPTX], + SP_DP_DOWNSPREAD_CTRL1_REG, 0); + if (err) + return err; + + if (anx6345->dpcd[DP_MAX_DOWNSPREAD] & DP_MAX_DOWNSPREAD_0_5) { + DRM_DEBUG("Enable downspread on the sink\n"); + /* 4000PPM */ + err = regmap_write(anx6345->map[I2C_IDX_DPTX], + SP_DP_DOWNSPREAD_CTRL1_REG, 8); + if (err) + return err; + + err = drm_dp_dpcd_writeb(&anx6345->aux, DP_DOWNSPREAD_CTRL, + DP_SPREAD_AMP_0_5); + if (err < 0) + return err; + } else { + err = drm_dp_dpcd_writeb(&anx6345->aux, DP_DOWNSPREAD_CTRL, 0); + if (err < 0) + return err; + } + + /* Set the lane count and the link rate on the sink */ + if (drm_dp_enhanced_frame_cap(anx6345->dpcd)) + err = anx6345_set_bits(anx6345->map[I2C_IDX_DPTX], + SP_DP_SYSTEM_CTRL_BASE + 4, + SP_ENHANCED_MODE); + else + err = anx6345_clear_bits(anx6345->map[I2C_IDX_DPTX], + SP_DP_SYSTEM_CTRL_BASE + 4, + SP_ENHANCED_MODE); + if (err) + return err; + + value = drm_dp_link_rate_to_bw_code(anx6345->link.rate); + err = regmap_write(anx6345->map[I2C_IDX_DPTX], + SP_DP_MAIN_LINK_BW_SET_REG, value); + if (err) + return err; + + err = regmap_write(anx6345->map[I2C_IDX_DPTX], + SP_DP_LANE_COUNT_SET_REG, anx6345->link.num_lanes); + if (err) + return err; + + err = drm_dp_link_configure(&anx6345->aux, &anx6345->link); + if (err < 0) { + DRM_ERROR("Failed to configure DisplayPort link: %d\n", err); + return err; + } + + /* Start training on the source */ + err = regmap_write(anx6345->map[I2C_IDX_DPTX], SP_DP_LT_CTRL_REG, + SP_LT_EN); + if (err) + return err; + + err = regmap_read_poll_timeout(anx6345->map[I2C_IDX_DPTX], + SP_DP_LT_CTRL_REG, + value, !(value & SP_DP_LT_INPROGRESS), + POLL_DELAY, POLL_TIMEOUT); + if (err) + return err; + + return 0; +} + +static int anx6345_tx_initialization(struct anx6345 *anx6345) +{ + int err, i; + + /* FIXME: colordepth is hardcoded for now */ + err = regmap_write(anx6345->map[I2C_IDX_TXCOM], SP_VID_CTRL2_REG, + SP_IN_BPC_6BIT << SP_IN_BPC_SHIFT); + if (err) + return err; + + err = regmap_write(anx6345->map[I2C_IDX_DPTX], SP_DP_PLL_CTRL_REG, 0); + if (err) + return err; + + err = regmap_write(anx6345->map[I2C_IDX_TXCOM], + SP_ANALOG_DEBUG1_REG, 0); + if (err) + return err; + + err = regmap_write(anx6345->map[I2C_IDX_DPTX], + SP_DP_LINK_DEBUG_CTRL_REG, + SP_NEW_PRBS7 | SP_M_VID_DEBUG); + if (err) + return err; + + err = regmap_write(anx6345->map[I2C_IDX_DPTX], + SP_DP_ANALOG_POWER_DOWN_REG, 0); + if (err) + return err; + + /* Force HPD */ + err = anx6345_set_bits(anx6345->map[I2C_IDX_DPTX], + SP_DP_SYSTEM_CTRL_BASE + 3, + SP_HPD_FORCE | SP_HPD_CTRL); + if (err) + return err; + + for (i = 0; i < 4; i++) { + /* 4 lanes */ + err = regmap_write(anx6345->map[I2C_IDX_DPTX], + SP_DP_LANE0_LT_CTRL_REG + i, 0); + if (err) + return err; + } + + /* Reset AUX */ + err = anx6345_set_bits(anx6345->map[I2C_IDX_TXCOM], + SP_RESET_CTRL2_REG, SP_AUX_RST); + if (err) + return err; + + err = anx6345_clear_bits(anx6345->map[I2C_IDX_TXCOM], + SP_RESET_CTRL2_REG, SP_AUX_RST); + if (err) + return err; + + return 0; +} + +static void anx6345_poweron(struct anx6345 *anx6345) +{ + int err; + + /* Ensure reset is asserted before starting power on sequence */ + gpiod_set_value_cansleep(anx6345->gpiod_reset, 1); + usleep_range(1000, 2000); + + err = regulator_enable(anx6345->dvdd12); + if (err) { + DRM_ERROR("Failed to enable dvdd12 regulator: %d\n", + err); + return; + } + + /* T1 - delay between VDD12 and VDD25 should be 0-2ms */ + usleep_range(1000, 2000); + + err = regulator_enable(anx6345->dvdd25); + if (err) { + DRM_ERROR("Failed to enable dvdd25 regulator: %d\n", + err); + return; + } + + /* T2 - delay between RESETN and all power rail stable, + * should be 2-5ms + */ + usleep_range(2000, 5000); + + gpiod_set_value_cansleep(anx6345->gpiod_reset, 0); + + /* Power on registers module */ + anx6345_set_bits(anx6345->map[I2C_IDX_TXCOM], SP_POWERDOWN_CTRL_REG, + SP_HDCP_PD | SP_AUDIO_PD | SP_VIDEO_PD | SP_LINK_PD); + anx6345_clear_bits(anx6345->map[I2C_IDX_TXCOM], SP_POWERDOWN_CTRL_REG, + SP_REGISTER_PD | SP_TOTAL_PD); + + if (anx6345->panel) + drm_panel_prepare(anx6345->panel); + + anx6345->powered = true; +} + +static void anx6345_poweroff(struct anx6345 *anx6345) +{ + int err; + + gpiod_set_value_cansleep(anx6345->gpiod_reset, 1); + usleep_range(1000, 2000); + + if (anx6345->panel) + drm_panel_unprepare(anx6345->panel); + + err = regulator_disable(anx6345->dvdd25); + if (err) { + DRM_ERROR("Failed to disable dvdd25 regulator: %d\n", + err); + return; + } + + usleep_range(5000, 10000); + + err = regulator_disable(anx6345->dvdd12); + if (err) { + DRM_ERROR("Failed to disable dvdd12 regulator: %d\n", + err); + return; + } + + usleep_range(1000, 2000); + + anx6345->powered = false; +} + +static int anx6345_start(struct anx6345 *anx6345) +{ + int err; + + if (!anx6345->powered) + anx6345_poweron(anx6345); + + /* Power on needed modules */ + err = anx6345_clear_bits(anx6345->map[I2C_IDX_TXCOM], + SP_POWERDOWN_CTRL_REG, + SP_VIDEO_PD | SP_LINK_PD); + + err = anx6345_tx_initialization(anx6345); + if (err) { + DRM_ERROR("Failed eDP transmitter initialization: %d\n", err); + anx6345_poweroff(anx6345); + return err; + } + + err = anx6345_dp_link_training(anx6345); + if (err) { + DRM_ERROR("Failed link training: %d\n", err); + anx6345_poweroff(anx6345); + return err; + } + + /* + * This delay seems to help keep the hardware in a good state. Without + * it, there are times where it fails silently. + */ + usleep_range(10000, 15000); + + return 0; +} + +static int anx6345_config_dp_output(struct anx6345 *anx6345) +{ + int err; + + err = anx6345_clear_bits(anx6345->map[I2C_IDX_TXCOM], SP_VID_CTRL1_REG, + SP_VIDEO_MUTE); + if (err) + return err; + + /* Enable DP output */ + err = anx6345_set_bits(anx6345->map[I2C_IDX_TXCOM], SP_VID_CTRL1_REG, + SP_VIDEO_EN); + if (err) + return err; + + /* Force stream valid */ + err = anx6345_set_bits(anx6345->map[I2C_IDX_DPTX], + SP_DP_SYSTEM_CTRL_BASE + 3, + SP_STRM_FORCE | SP_STRM_CTRL); + if (err) + return err; + + return 0; +} + +static int anx6345_get_downstream_info(struct anx6345 *anx6345) +{ + u8 value; + int err; + + err = drm_dp_dpcd_readb(&anx6345->aux, DP_SINK_COUNT, &value); + if (err < 0) { + DRM_ERROR("Get sink count failed %d\n", err); + return err; + } + + if (!DP_GET_SINK_COUNT(value)) { + DRM_ERROR("Downstream disconnected\n"); + return -EIO; + } + + return 0; +} + +static int anx6345_get_modes(struct drm_connector *connector) +{ + struct anx6345 *anx6345 = connector_to_anx6345(connector); + int err, num_modes = 0; + bool power_off = false; + + mutex_lock(&anx6345->lock); + + if (!anx6345->edid) { + if (!anx6345->powered) { + anx6345_poweron(anx6345); + power_off = true; + } + + err = anx6345_get_downstream_info(anx6345); + if (err) { + DRM_ERROR("Failed to get downstream info: %d\n", err); + goto unlock; + } + + anx6345->edid = drm_get_edid(connector, &anx6345->aux.ddc); + if (!anx6345->edid) + DRM_ERROR("Failed to read EDID from panel\n"); + + err = drm_connector_update_edid_property(connector, + anx6345->edid); + if (err) { + DRM_ERROR("Failed to update EDID property: %d\n", err); + goto unlock; + } + } + + num_modes += drm_add_edid_modes(connector, anx6345->edid); + +unlock: + if (power_off) + anx6345_poweroff(anx6345); + + mutex_unlock(&anx6345->lock); + + if (!num_modes && anx6345->panel) + num_modes += drm_panel_get_modes(anx6345->panel); + + return num_modes; +} + +static const struct drm_connector_helper_funcs anx6345_connector_helper_funcs = { + .get_modes = anx6345_get_modes, +}; + +static void +anx6345_connector_destroy(struct drm_connector *connector) +{ + struct anx6345 *anx6345 = connector_to_anx6345(connector); + + if (anx6345->panel) + drm_panel_detach(anx6345->panel); + drm_connector_cleanup(connector); +} + +static const struct drm_connector_funcs anx6345_connector_funcs = { + .fill_modes = drm_helper_probe_single_connector_modes, + .destroy = anx6345_connector_destroy, + .reset = drm_atomic_helper_connector_reset, + .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state, + .atomic_destroy_state = drm_atomic_helper_connector_destroy_state, +}; + +static int anx6345_bridge_attach(struct drm_bridge *bridge) +{ + struct anx6345 *anx6345 = bridge_to_anx6345(bridge); + int err; + + if (!bridge->encoder) { + DRM_ERROR("Parent encoder object not found"); + return -ENODEV; + } + + /* Register aux channel */ + anx6345->aux.name = "DP-AUX"; + anx6345->aux.dev = &anx6345->client->dev; + anx6345->aux.transfer = anx6345_aux_transfer; + + err = drm_dp_aux_register(&anx6345->aux); + if (err < 0) { + DRM_ERROR("Failed to register aux channel: %d\n", err); + return err; + } + + err = drm_connector_init(bridge->dev, &anx6345->connector, + &anx6345_connector_funcs, + DRM_MODE_CONNECTOR_eDP); + if (err) { + DRM_ERROR("Failed to initialize connector: %d\n", err); + return err; + } + + drm_connector_helper_add(&anx6345->connector, + &anx6345_connector_helper_funcs); + + err = drm_connector_register(&anx6345->connector); + if (err) { + DRM_ERROR("Failed to register connector: %d\n", err); + return err; + } + + anx6345->connector.polled = DRM_CONNECTOR_POLL_HPD; + + err = drm_connector_attach_encoder(&anx6345->connector, + bridge->encoder); + if (err) { + DRM_ERROR("Failed to link up connector to encoder: %d\n", err); + return err; + } + + if (anx6345->panel) { + err = drm_panel_attach(anx6345->panel, &anx6345->connector); + if (err) { + DRM_ERROR("Failed to attach panel: %d\n", err); + return err; + } + } + + return 0; +} + +static enum drm_mode_status +anx6345_bridge_mode_valid(struct drm_bridge *bridge, + const struct drm_display_mode *mode) +{ + if (mode->flags & DRM_MODE_FLAG_INTERLACE) + return MODE_NO_INTERLACE; + + /* Max 1200p at 5.4 Ghz, one lane */ + if (mode->clock > 154000) + return MODE_CLOCK_HIGH; + + return MODE_OK; +} + +static void anx6345_bridge_disable(struct drm_bridge *bridge) +{ + struct anx6345 *anx6345 = bridge_to_anx6345(bridge); + + /* Power off all modules except configuration registers access */ + anx6345_set_bits(anx6345->map[I2C_IDX_TXCOM], SP_POWERDOWN_CTRL_REG, + SP_HDCP_PD | SP_AUDIO_PD | SP_VIDEO_PD | SP_LINK_PD); + if (anx6345->panel) + drm_panel_disable(anx6345->panel); + + if (anx6345->powered) + anx6345_poweroff(anx6345); +} + +static void anx6345_bridge_enable(struct drm_bridge *bridge) +{ + struct anx6345 *anx6345 = bridge_to_anx6345(bridge); + int err; + + if (anx6345->panel) + drm_panel_enable(anx6345->panel); + + err = anx6345_start(anx6345); + if (err) { + DRM_ERROR("Failed to initialize: %d\n", err); + return; + } + + err = anx6345_config_dp_output(anx6345); + if (err) + DRM_ERROR("Failed to enable DP output: %d\n", err); +} + +static const struct drm_bridge_funcs anx6345_bridge_funcs = { + .attach = anx6345_bridge_attach, + .mode_valid = anx6345_bridge_mode_valid, + .disable = anx6345_bridge_disable, + .enable = anx6345_bridge_enable, +}; + +static void unregister_i2c_dummy_clients(struct anx6345 *anx6345) +{ + unsigned int i; + + for (i = 1; i < ARRAY_SIZE(anx6345->i2c_clients); i++) + if (anx6345->i2c_clients[i] && + anx6345->i2c_clients[i]->addr != anx6345->client->addr) + i2c_unregister_device(anx6345->i2c_clients[i]); +} + +static const struct regmap_config anx6345_regmap_config = { + .reg_bits = 8, + .val_bits = 8, + .max_register = 0xff, + .cache_type = REGCACHE_NONE, +}; + +static const u16 anx6345_chipid_list[] = { + 0x6345, +}; + +static bool anx6345_get_chip_id(struct anx6345 *anx6345) +{ + unsigned int i, idl, idh, version; + + if (regmap_read(anx6345->map[I2C_IDX_TXCOM], SP_DEVICE_IDL_REG, &idl)) + return false; + + if (regmap_read(anx6345->map[I2C_IDX_TXCOM], SP_DEVICE_IDH_REG, &idh)) + return false; + + anx6345->chipid = (u8)idl | ((u8)idh << 8); + + if (regmap_read(anx6345->map[I2C_IDX_TXCOM], SP_DEVICE_VERSION_REG, + &version)) + return false; + + for (i = 0; i < ARRAY_SIZE(anx6345_chipid_list); i++) { + if (anx6345->chipid == anx6345_chipid_list[i]) { + DRM_INFO("Found ANX%x (ver. %d) eDP Transmitter\n", + anx6345->chipid, version); + return true; + } + } + + DRM_ERROR("ANX%x (ver. %d) not supported by this driver\n", + anx6345->chipid, version); + + return false; +} + +static int anx6345_i2c_probe(struct i2c_client *client, + const struct i2c_device_id *id) +{ + struct anx6345 *anx6345; + struct device *dev; + int i, err; + + anx6345 = devm_kzalloc(&client->dev, sizeof(*anx6345), GFP_KERNEL); + if (!anx6345) + return -ENOMEM; + + mutex_init(&anx6345->lock); + + anx6345->bridge.of_node = client->dev.of_node; + + anx6345->client = client; + i2c_set_clientdata(client, anx6345); + + dev = &anx6345->client->dev; + + err = drm_of_find_panel_or_bridge(client->dev.of_node, 1, 0, + &anx6345->panel, NULL); + if (err == -EPROBE_DEFER) + return err; + + if (err) + DRM_DEBUG("No panel found\n"); + + /* 1.2V digital core power regulator */ + anx6345->dvdd12 = devm_regulator_get(dev, "dvdd12-supply"); + if (IS_ERR(anx6345->dvdd12)) { + DRM_ERROR("dvdd12-supply not found\n"); + return PTR_ERR(anx6345->dvdd12); + } + + /* 2.5V digital core power regulator */ + anx6345->dvdd25 = devm_regulator_get(dev, "dvdd25-supply"); + if (IS_ERR(anx6345->dvdd25)) { + DRM_ERROR("dvdd25-supply not found\n"); + return PTR_ERR(anx6345->dvdd25); + } + + /* GPIO for chip reset */ + anx6345->gpiod_reset = devm_gpiod_get(dev, "reset", GPIOD_OUT_LOW); + if (IS_ERR(anx6345->gpiod_reset)) { + DRM_ERROR("Reset gpio not found\n"); + return PTR_ERR(anx6345->gpiod_reset); + } + + /* Map slave addresses of ANX6345 */ + for (i = 0; i < I2C_NUM_ADDRESSES; i++) { + if (anx6345_i2c_addresses[i] >> 1 != client->addr) + anx6345->i2c_clients[i] = i2c_new_dummy(client->adapter, + anx6345_i2c_addresses[i] >> 1); + else + anx6345->i2c_clients[i] = client; + + if (!anx6345->i2c_clients[i]) { + err = -ENOMEM; + DRM_ERROR("Failed to reserve I2C bus %02x\n", + anx6345_i2c_addresses[i]); + goto err_unregister_i2c; + } + + anx6345->map[i] = devm_regmap_init_i2c(anx6345->i2c_clients[i], + &anx6345_regmap_config); + if (IS_ERR(anx6345->map[i])) { + err = PTR_ERR(anx6345->map[i]); + DRM_ERROR("Failed regmap initialization %02x\n", + anx6345_i2c_addresses[i]); + goto err_unregister_i2c; + } + } + + /* Look for supported chip ID */ + anx6345_poweron(anx6345); + if (anx6345_get_chip_id(anx6345)) { + anx6345->bridge.funcs = &anx6345_bridge_funcs; + drm_bridge_add(&anx6345->bridge); + + return 0; + } else { + anx6345_poweroff(anx6345); + err = -ENODEV; + } + +err_unregister_i2c: + unregister_i2c_dummy_clients(anx6345); + return err; +} + +static int anx6345_i2c_remove(struct i2c_client *client) +{ + struct anx6345 *anx6345 = i2c_get_clientdata(client); + + drm_bridge_remove(&anx6345->bridge); + + unregister_i2c_dummy_clients(anx6345); + + kfree(anx6345->edid); + + mutex_destroy(&anx6345->lock); + + return 0; +} + +static const struct i2c_device_id anx6345_id[] = { + { "anx6345", 0 }, + { /* sentinel */ } +}; +MODULE_DEVICE_TABLE(i2c, anx6345_id); + +static const struct of_device_id anx6345_match_table[] = { + { .compatible = "analogix,anx6345", }, + { /* sentinel */ }, +}; +MODULE_DEVICE_TABLE(of, anx6345_match_table); + +static struct i2c_driver anx6345_driver = { + .driver = { + .name = "anx6345", + .of_match_table = of_match_ptr(anx6345_match_table), + }, + .probe = anx6345_i2c_probe, + .remove = anx6345_i2c_remove, + .id_table = anx6345_id, +}; +module_i2c_driver(anx6345_driver); + +MODULE_DESCRIPTION("ANX6345 eDP Transmitter driver"); +MODULE_AUTHOR("Enric Balletbo i Serra <enric.balletbo@collabora.com>"); +MODULE_LICENSE("GPL v2");