From patchwork Tue Jan 14 14:55:33 2014 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Thierry Reding X-Patchwork-Id: 3486081 Return-Path: X-Original-To: patchwork-dri-devel@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork1.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.19.201]) by patchwork1.web.kernel.org (Postfix) with ESMTP id E43289F169 for ; Tue, 14 Jan 2014 14:56:02 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id 285A82021E for ; Tue, 14 Jan 2014 14:56:00 +0000 (UTC) Received: from gabe.freedesktop.org (gabe.freedesktop.org [131.252.210.177]) by mail.kernel.org (Postfix) with ESMTP id 65B0020240 for ; Tue, 14 Jan 2014 14:55:54 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 4A10AFCDD7; Tue, 14 Jan 2014 06:55:50 -0800 (PST) X-Original-To: dri-devel@lists.freedesktop.org Delivered-To: dri-devel@lists.freedesktop.org Received: from mail-bk0-f46.google.com (mail-bk0-f46.google.com [209.85.214.46]) by gabe.freedesktop.org (Postfix) with ESMTP id CDFFDFCDD2; Tue, 14 Jan 2014 06:55:41 -0800 (PST) Received: by mail-bk0-f46.google.com with SMTP id u15so266163bkz.33 for ; Tue, 14 Jan 2014 06:55:41 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=from:to:cc:subject:date:message-id:in-reply-to:references; bh=K1Y55b49X4+ruww3W+jPhHmTC8ixibtsWC/MTx+lT5w=; b=JocG5xXveOJupQbLcnKmiU1IzpvMqrbNK1rlJcq+s/grDlGBWwX3NKCJWabI3Gu+v4 gvjbnHbYWoVMKSlyTRZxEMHgAdjrlimxZ3faNyfXlP1Qxx+PM3bYtf8UdHVN2nYVYEzb OrYXCB0SWphpLYiihSYXmEPWGg4A863GiVjbY0HxT4+iiuI6f3OcGpYVUa1AvX2+XwKN +0yIO9OyFEpoabAijKYxBxG91CvierY6Y8BgdhNpbhvlG78o7SSlfoSMV3Pwneyu+e4K /cRIo3Riw9HzUQRIZ7Pq6FMzRkmpt+A+/V77FMiO+HSNgAm96rOS+ZoazDasotRo6qmO FYmw== X-Received: by 10.204.124.4 with SMTP id s4mr1286425bkr.90.1389711340954; Tue, 14 Jan 2014 06:55:40 -0800 (PST) Received: from localhost (port-33652.pppoe.wtnet.de. [46.59.182.73]) by mx.google.com with ESMTPSA id dt5sm978182bkc.1.2014.01.14.06.55.39 for (version=TLSv1.2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Tue, 14 Jan 2014 06:55:40 -0800 (PST) From: Thierry Reding To: dri-devel@lists.freedesktop.org Subject: [PATCH v3 1/4] drm/dp: Add AUX channel infrastructure Date: Tue, 14 Jan 2014 15:55:33 +0100 Message-Id: <1389711336-29702-2-git-send-email-treding@nvidia.com> X-Mailer: git-send-email 1.8.4.2 In-Reply-To: <1389711336-29702-1-git-send-email-treding@nvidia.com> References: <1389711336-29702-1-git-send-email-treding@nvidia.com> Cc: intel-gfx@lists.freedesktop.org X-BeenThere: dri-devel@lists.freedesktop.org X-Mailman-Version: 2.1.13 Precedence: list List-Id: Direct Rendering Infrastructure - Development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , MIME-Version: 1.0 Sender: dri-devel-bounces@lists.freedesktop.org Errors-To: dri-devel-bounces@lists.freedesktop.org X-Spam-Status: No, score=-4.2 required=5.0 tests=BAYES_00, DKIM_ADSP_CUSTOM_MED, DKIM_SIGNED, FREEMAIL_FROM, RCVD_IN_DNSWL_MED, RP_MATCHES_RCVD, T_DKIM_INVALID, UNPARSEABLE_RELAY autolearn=unavailable version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP This is a superset of the current i2c_dp_aux bus functionality and can be used to transfer native AUX in addition to I2C-over-AUX messages. Helpers are provided to read and write the DPCD, either blockwise or byte-wise. Many of the existing helpers for DisplayPort take a copy of a portion of the DPCD and operate on that, without a way to write data back to the DPCD (e.g. for configuration of the link). Subsequent patches will build upon this infrastructure to provide common functionality in a generic way. Signed-off-by: Thierry Reding --- Changes in v3: - reorder drm_dp_dpcd_writeb() arguments to be more intuitive - return number of bytes transferred in drm_dp_dpcd_write() - factor out drm_dp_dpcd_access() - describe error codes drivers/gpu/drm/drm_dp_helper.c | 110 ++++++++++++++++++++++++++++++++++++++++ include/drm/drm_dp_helper.h | 67 ++++++++++++++++++++++++ 2 files changed, 177 insertions(+) diff --git a/drivers/gpu/drm/drm_dp_helper.c b/drivers/gpu/drm/drm_dp_helper.c index 9e978aae8972..3641c5eb349b 100644 --- a/drivers/gpu/drm/drm_dp_helper.c +++ b/drivers/gpu/drm/drm_dp_helper.c @@ -346,3 +346,113 @@ int drm_dp_bw_code_to_link_rate(u8 link_bw) } } EXPORT_SYMBOL(drm_dp_bw_code_to_link_rate); + +/** + * DOC: dp helpers + * + * The DisplayPort AUX channel is an abstraction to allow generic, driver- + * independent access to AUX functionality. Drivers can take advantage of + * this by filling in the fields of the drm_dp_aux sturcture. + * + * The .transfer() function is the hardware-specific implementation of how + * a transaction is executed on the AUX channel. A pointer to a struct + * drm_dp_aux_msg describing the transaction is passed into this function. + * Upon success, the implementation should return the number of bytes that + * were transferred, or a negative error-code on failure. Helpers propagate + * errors from the .transfer() function, with the exception of the -EBUSY + * error, which causes a transaction to be retried. + * + * The .dev field should be set to a pointer to the device that implements + * the AUX channel. + */ + +static int drm_dp_dpcd_access(struct drm_dp_aux *aux, u8 request, + unsigned int offset, void *buffer, size_t size) +{ + struct drm_dp_aux_msg msg; + unsigned int retry; + int err; + + memset(&msg, 0, sizeof(msg)); + msg.address = offset; + msg.request = request; + msg.buffer = buffer; + msg.size = size; + + /* + * The specification doesn't give any recommendation on how often to + * retry native transactions, so retry 7 times like for I2C-over-AUX + * transactions. + */ + for (retry = 0; retry < 7; retry++) { + err = aux->transfer(aux, &msg); + if (err < 0) { + if (err == -EBUSY) + continue; + + return err; + } + + if (err == 0) + return -EPROTO; + + switch (msg.reply & DP_AUX_NATIVE_REPLY_MASK) { + case DP_AUX_NATIVE_REPLY_ACK: + return err; + + case DP_AUX_NATIVE_REPLY_NACK: + return -EIO; + + case DP_AUX_NATIVE_REPLY_DEFER: + usleep_range(400, 500); + break; + } + } + + DRM_ERROR("too many retries, giving up\n"); + return -EIO; +} + +/** + * drm_dp_dpcd_read() - read a series of bytes from the DPCD + * @aux: DisplayPort AUX channel + * @offset: address of the (first) register to read + * @buffer: buffer to store the register values + * @size: number of bytes in @buffer + * + * Returns the number of bytes transferred on success, or a negative error + * code on failure. -EIO is returned if the request was NAKed by the sink or + * if the retry count was exceeded. If no bytes were transferred, -EPROTO is + * returned. Errors from the underlying AUX channel transfer function, with + * the exception of -EBUSY (upon which the transaction will be retried), are + * propagated to the caller. + */ +ssize_t drm_dp_dpcd_read(struct drm_dp_aux *aux, unsigned int offset, + void *buffer, size_t size) +{ + return drm_dp_dpcd_access(aux, DP_AUX_NATIVE_READ, offset, buffer, + size); +} +EXPORT_SYMBOL(drm_dp_dpcd_read); + +/** + * drm_dp_dpcd_write() - write a series of bytes to the DPCD + * @aux: DisplayPort AUX channel + * @offset: address of the (first) register to write + * @buffer: buffer containing the values to write + * @size: number of bytes in @buffer + * + * Returns the number of bytes transferred on success, or a negative error + * code on failure. -EIO is returned if the request was NAKed by the sink or + * if the retry count was exceeded. If no bytes were transferred, -EPROTO is + * returned. Errors from the underlying AUX channel transfer function, with + * the exception of -EBUSY (upon which the transaction will be retried), are + * propagated to the caller. + */ +ssize_t drm_dp_dpcd_write(struct drm_dp_aux *aux, unsigned int offset, + void *buffer, size_t size) +{ + return drm_dp_dpcd_access(aux, DP_AUX_NATIVE_WRITE, offset, buffer, + size); +} +EXPORT_SYMBOL(drm_dp_dpcd_write); diff --git a/include/drm/drm_dp_helper.h b/include/drm/drm_dp_helper.h index 1d09050a8c00..c69c1dc1b741 100644 --- a/include/drm/drm_dp_helper.h +++ b/include/drm/drm_dp_helper.h @@ -398,4 +398,71 @@ drm_dp_enhanced_frame_cap(const u8 dpcd[DP_RECEIVER_CAP_SIZE]) (dpcd[DP_MAX_LANE_COUNT] & DP_ENHANCED_FRAME_CAP); } +/* + * DisplayPort AUX channel + */ + +/** + * struct drm_dp_aux_msg - DisplayPort AUX channel transaction + * @address: address of the (first) register to access + * @request: contains the type of transaction (see DP_AUX_* macros) + * @reply: upon completion, contains the reply type of the transaction + * @buffer: pointer to a transmission or reception buffer + * @size: size of @buffer + */ +struct drm_dp_aux_msg { + unsigned int address; + u8 request; + u8 reply; + void *buffer; + size_t size; +}; + +/** + * struct drm_dp_aux - DisplayPort AUX channel + * @dev: pointer to struct device that is the parent for this AUX channel + * @transfer: transfers a message representing a single AUX transaction + */ +struct drm_dp_aux { + struct device *dev; + + ssize_t (*transfer)(struct drm_dp_aux *aux, + struct drm_dp_aux_msg *msg); +}; + +ssize_t drm_dp_dpcd_read(struct drm_dp_aux *aux, unsigned int offset, + void *buffer, size_t size); +ssize_t drm_dp_dpcd_write(struct drm_dp_aux *aux, unsigned int offset, + void *buffer, size_t size); + +/** + * drm_dp_dpcd_readb() - read a single byte from the DPCD + * @aux: DisplayPort AUX channel + * @offset: address of the register to read + * @valuep: location where the value of the register will be stored + * + * Returns the number of bytes transferred (1) on success, or a negative + * error code on failure. + */ +static inline ssize_t drm_dp_dpcd_readb(struct drm_dp_aux *aux, + unsigned int offset, u8 *valuep) +{ + return drm_dp_dpcd_read(aux, offset, valuep, 1); +} + +/** + * drm_dp_dpcd_writeb() - write a single byte to the DPCD + * @aux: DisplayPort AUX channel + * @offset: address of the register to write + * @value: value to write to the register + * + * Returns the number of bytes transferred (1) on success, or a negative + * error code on failure. + */ +static inline ssize_t drm_dp_dpcd_writeb(struct drm_dp_aux *aux, + unsigned int offset, u8 value) +{ + return drm_dp_dpcd_write(aux, offset, &value, 1); +} + #endif /* _DRM_DP_HELPER_H_ */