From patchwork Wed Jul 7 15:20:00 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jacopo Mondi X-Patchwork-Id: 471589 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-16.8 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI, SPF_HELO_NONE, SPF_PASS, USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id C42C1C07E9E for ; Wed, 7 Jul 2021 15:19:28 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id AB79C61CC5 for ; Wed, 7 Jul 2021 15:19:28 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232245AbhGGPWI (ORCPT ); Wed, 7 Jul 2021 11:22:08 -0400 Received: from relay4-d.mail.gandi.net ([217.70.183.196]:47299 "EHLO relay4-d.mail.gandi.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232050AbhGGPWH (ORCPT ); Wed, 7 Jul 2021 11:22:07 -0400 Received: (Authenticated sender: jacopo@jmondi.org) by relay4-d.mail.gandi.net (Postfix) with ESMTPSA id 4AAB8E0011; Wed, 7 Jul 2021 15:19:25 +0000 (UTC) From: Jacopo Mondi To: Hans Verkuil , Mauro Carvalho Chehab Cc: Jacopo Mondi , Kieran Bingham , Laurent Pinchart , =?utf-8?q?Niklas_S=C3=B6?= =?utf-8?q?derlund?= , linux-media@vger.kernel.org, linux-renesas-soc@vger.kernel.org Subject: [PATCH v2 1/4] media: v4l2-subdev: Introduce post_register() core op Date: Wed, 7 Jul 2021 17:20:00 +0200 Message-Id: <20210707152003.136272-2-jacopo+renesas@jmondi.org> X-Mailer: git-send-email 2.32.0 In-Reply-To: <20210707152003.136272-1-jacopo+renesas@jmondi.org> References: <20210707152003.136272-1-jacopo+renesas@jmondi.org> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-media@vger.kernel.org Introduce the post_register() subdevice core operation. The operation is meant to be called after the subdevice has been registered. Signed-off-by: Jacopo Mondi Suggested-by: Hans Verkuil --- include/media/v4l2-subdev.h | 3 +++ 1 file changed, 3 insertions(+) diff --git a/include/media/v4l2-subdev.h b/include/media/v4l2-subdev.h index 95f8bfd63273..4c226c4b69a6 100644 --- a/include/media/v4l2-subdev.h +++ b/include/media/v4l2-subdev.h @@ -187,6 +187,8 @@ struct v4l2_subdev_io_pin_config { * for it to be warned when the value of a control changes. * * @unsubscribe_event: remove event subscription from the control framework. + * + * @post_register: called after the subdevice has been registered. */ struct v4l2_subdev_core_ops { int (*log_status)(struct v4l2_subdev *sd); @@ -213,6 +215,7 @@ struct v4l2_subdev_core_ops { struct v4l2_event_subscription *sub); int (*unsubscribe_event)(struct v4l2_subdev *sd, struct v4l2_fh *fh, struct v4l2_event_subscription *sub); + int (*post_register)(struct v4l2_subdev *sd); }; /** From patchwork Wed Jul 7 15:20:01 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jacopo Mondi X-Patchwork-Id: 471014 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-16.8 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 7C074C11F66 for ; Wed, 7 Jul 2021 15:19:30 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 66F3C61CC3 for ; Wed, 7 Jul 2021 15:19:30 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232256AbhGGPWK (ORCPT ); Wed, 7 Jul 2021 11:22:10 -0400 Received: from relay4-d.mail.gandi.net ([217.70.183.196]:34441 "EHLO relay4-d.mail.gandi.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232050AbhGGPWJ (ORCPT ); Wed, 7 Jul 2021 11:22:09 -0400 Received: (Authenticated sender: jacopo@jmondi.org) by relay4-d.mail.gandi.net (Postfix) with ESMTPSA id 28381E0008; Wed, 7 Jul 2021 15:19:26 +0000 (UTC) From: Jacopo Mondi To: Hans Verkuil , Mauro Carvalho Chehab Cc: Jacopo Mondi , Kieran Bingham , Laurent Pinchart , =?utf-8?q?Niklas_S=C3=B6?= =?utf-8?q?derlund?= , linux-media@vger.kernel.org, linux-renesas-soc@vger.kernel.org Subject: [PATCH v2 2/4] media: v4l2-async: Add notifier flags Date: Wed, 7 Jul 2021 17:20:01 +0200 Message-Id: <20210707152003.136272-3-jacopo+renesas@jmondi.org> X-Mailer: git-send-email 2.32.0 In-Reply-To: <20210707152003.136272-1-jacopo+renesas@jmondi.org> References: <20210707152003.136272-1-jacopo+renesas@jmondi.org> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-media@vger.kernel.org Add a 'flags' field to the async notifier structure and define the V4L2_ASYNC_NOTIFIER_DEFER_POST_REGISTER flag. Signed-off-by: Jacopo Mondi Suggested-by: Hans Verkuil --- drivers/media/v4l2-core/v4l2-async.c | 1 + include/media/v4l2-async.h | 10 ++++++++++ 2 files changed, 11 insertions(+) diff --git a/drivers/media/v4l2-core/v4l2-async.c b/drivers/media/v4l2-core/v4l2-async.c index cd9e78c63791..0836e01e59ca 100644 --- a/drivers/media/v4l2-core/v4l2-async.c +++ b/drivers/media/v4l2-core/v4l2-async.c @@ -472,6 +472,7 @@ static int v4l2_async_notifier_asd_valid(struct v4l2_async_notifier *notifier, void v4l2_async_notifier_init(struct v4l2_async_notifier *notifier) { INIT_LIST_HEAD(¬ifier->asd_list); + notifier->flags = 0; } EXPORT_SYMBOL(v4l2_async_notifier_init); diff --git a/include/media/v4l2-async.h b/include/media/v4l2-async.h index 5b275a845c20..96471fb44646 100644 --- a/include/media/v4l2-async.h +++ b/include/media/v4l2-async.h @@ -92,6 +92,13 @@ struct v4l2_async_notifier_operations { struct v4l2_async_subdev *asd); }; +/* + * Set this flag to instruct the core framework not to call the post_register() + * core operation. The driver that registered the notifier will take care to + * do so eventually. + */ +#define V4L2_ASYNC_NOTIFIER_DEFER_POST_REGISTER BIT(0) + /** * struct v4l2_async_notifier - v4l2_device notifier data * @@ -103,6 +110,8 @@ struct v4l2_async_notifier_operations { * @waiting: list of struct v4l2_async_subdev, waiting for their drivers * @done: list of struct v4l2_subdev, already probed * @list: member in a global list of notifiers + * @flags: notifier's flags. Can be: + * %V4L2_ASYNC_NOTIFIER_DEFER_POST_REGISTER */ struct v4l2_async_notifier { const struct v4l2_async_notifier_operations *ops; @@ -113,6 +122,7 @@ struct v4l2_async_notifier { struct list_head waiting; struct list_head done; struct list_head list; + u32 flags; }; /** From patchwork Wed Jul 7 15:20:02 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jacopo Mondi X-Patchwork-Id: 471588 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-16.8 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI, SPF_HELO_NONE, SPF_PASS, USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 94C89C07E95 for ; Wed, 7 Jul 2021 15:19:32 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 7E2C9601FC for ; Wed, 7 Jul 2021 15:19:32 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232263AbhGGPWM (ORCPT ); Wed, 7 Jul 2021 11:22:12 -0400 Received: from relay4-d.mail.gandi.net ([217.70.183.196]:45989 "EHLO relay4-d.mail.gandi.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232050AbhGGPWL (ORCPT ); Wed, 7 Jul 2021 11:22:11 -0400 Received: (Authenticated sender: jacopo@jmondi.org) by relay4-d.mail.gandi.net (Postfix) with ESMTPSA id 0FF3AE0002; Wed, 7 Jul 2021 15:19:28 +0000 (UTC) From: Jacopo Mondi To: Hans Verkuil , Mauro Carvalho Chehab Cc: Jacopo Mondi , Kieran Bingham , Laurent Pinchart , =?utf-8?q?Niklas_S=C3=B6?= =?utf-8?q?derlund?= , linux-media@vger.kernel.org, linux-renesas-soc@vger.kernel.org Subject: [PATCH v2 3/4] media: v4l2-async: Call post_register() subdev op Date: Wed, 7 Jul 2021 17:20:02 +0200 Message-Id: <20210707152003.136272-4-jacopo+renesas@jmondi.org> X-Mailer: git-send-email 2.32.0 In-Reply-To: <20210707152003.136272-1-jacopo+renesas@jmondi.org> References: <20210707152003.136272-1-jacopo+renesas@jmondi.org> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-media@vger.kernel.org Call the "post_register()" subdev operation on a just registered subdevice, immediately after having called the 'bound' notifier operation on the parent. Signed-off-by: Jacopo Mondi Suggested-by: Hans Verkuil --- drivers/media/v4l2-core/v4l2-async.c | 10 ++++++++++ 1 file changed, 10 insertions(+) diff --git a/drivers/media/v4l2-core/v4l2-async.c b/drivers/media/v4l2-core/v4l2-async.c index 0836e01e59ca..fcc32ec15832 100644 --- a/drivers/media/v4l2-core/v4l2-async.c +++ b/drivers/media/v4l2-core/v4l2-async.c @@ -293,6 +293,16 @@ static int v4l2_async_match_notify(struct v4l2_async_notifier *notifier, return ret; } + if (!(notifier->flags & V4L2_ASYNC_NOTIFIER_DEFER_POST_REGISTER) && + sd->ops->core && sd->ops->core->post_register) { + ret = sd->ops->core->post_register(sd); + if (ret) { + v4l2_async_notifier_call_unbind(notifier, sd, sd->asd); + v4l2_device_unregister_subdev(sd); + return ret; + } + } + /* Remove from the waiting list */ list_del(&asd->list); sd->asd = asd; From patchwork Wed Jul 7 15:20:03 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jacopo Mondi X-Patchwork-Id: 471013 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-16.8 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI, SPF_HELO_NONE, SPF_PASS, USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 4CDDBC07E9E for ; Wed, 7 Jul 2021 15:19:34 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 33BBC61CC3 for ; Wed, 7 Jul 2021 15:19:34 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232269AbhGGPWN (ORCPT ); Wed, 7 Jul 2021 11:22:13 -0400 Received: from relay4-d.mail.gandi.net ([217.70.183.196]:37511 "EHLO relay4-d.mail.gandi.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232225AbhGGPWN (ORCPT ); Wed, 7 Jul 2021 11:22:13 -0400 Received: (Authenticated sender: jacopo@jmondi.org) by relay4-d.mail.gandi.net (Postfix) with ESMTPSA id CAA30E0012; Wed, 7 Jul 2021 15:19:30 +0000 (UTC) From: Jacopo Mondi To: Hans Verkuil , Mauro Carvalho Chehab Cc: Jacopo Mondi , Kieran Bingham , Laurent Pinchart , =?utf-8?q?Niklas_S=C3=B6?= =?utf-8?q?derlund?= , linux-media@vger.kernel.org, linux-renesas-soc@vger.kernel.org Subject: [PATCH v2 4/4] media: i2c: gmsl: Defer camera initialization Date: Wed, 7 Jul 2021 17:20:03 +0200 Message-Id: <20210707152003.136272-5-jacopo+renesas@jmondi.org> X-Mailer: git-send-email 2.32.0 In-Reply-To: <20210707152003.136272-1-jacopo+renesas@jmondi.org> References: <20210707152003.136272-1-jacopo+renesas@jmondi.org> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-media@vger.kernel.org Use the post_register() callback to defer the bulk of the camera modules initialization. The deserializer driver waits for all the registered camera to probe, increases its channel amplitude and the calls the subdevice post_register() operation that completes the initialization procedure. Signed-off-by: Jacopo Mondi --- drivers/media/i2c/max9286.c | 21 ++++++++-- drivers/media/i2c/rdacm20.c | 81 +++++++++++++++++++++---------------- drivers/media/i2c/rdacm21.c | 73 ++++++++++++++++++--------------- 3 files changed, 106 insertions(+), 69 deletions(-) diff --git a/drivers/media/i2c/max9286.c b/drivers/media/i2c/max9286.c index 8cd3340ea9bb..1b92d18a1f94 100644 --- a/drivers/media/i2c/max9286.c +++ b/drivers/media/i2c/max9286.c @@ -567,17 +567,31 @@ static int max9286_notify_bound(struct v4l2_async_notifier *notifier, if (priv->bound_sources != priv->source_mask) return 0; + /* + * Once all cameras have probed, increase the channel amplitude + * to compensate for the remote noise immunity threshold and call + * the camera post_register operation to complete initialization with + * noise immunity enabled. + */ + max9286_reverse_channel_setup(priv, MAX9286_REV_AMP_HIGH); + for_each_source(priv, source) { + ret = v4l2_subdev_call(source->sd, core, post_register); + if (ret) { + dev_err(&priv->client->dev, + "Failed to initialize camera device %u\n", + index); + return ret; + } + } + /* * All enabled sources have probed and enabled their reverse control * channels: * - * - Increase the reverse channel amplitude to compensate for the - * remote ends high threshold * - Verify all configuration links are properly detected * - Disable auto-ack as communication on the control channel are now * stable. */ - max9286_reverse_channel_setup(priv, MAX9286_REV_AMP_HIGH); max9286_check_config_link(priv, priv->source_mask); max9286_configure_i2c(priv, false); @@ -630,6 +644,7 @@ static int max9286_v4l2_notifier_register(struct max9286_priv *priv) } priv->notifier.ops = &max9286_notify_ops; + priv->notifier.flags |= V4L2_ASYNC_NOTIFIER_DEFER_POST_REGISTER; ret = v4l2_async_subdev_notifier_register(&priv->sd, &priv->notifier); if (ret) { diff --git a/drivers/media/i2c/rdacm20.c b/drivers/media/i2c/rdacm20.c index 025a610de893..ba956733aa89 100644 --- a/drivers/media/i2c/rdacm20.c +++ b/drivers/media/i2c/rdacm20.c @@ -435,44 +435,12 @@ static int rdacm20_get_fmt(struct v4l2_subdev *sd, return 0; } -static const struct v4l2_subdev_video_ops rdacm20_video_ops = { - .s_stream = rdacm20_s_stream, -}; - -static const struct v4l2_subdev_pad_ops rdacm20_subdev_pad_ops = { - .enum_mbus_code = rdacm20_enum_mbus_code, - .get_fmt = rdacm20_get_fmt, - .set_fmt = rdacm20_get_fmt, -}; - -static const struct v4l2_subdev_ops rdacm20_subdev_ops = { - .video = &rdacm20_video_ops, - .pad = &rdacm20_subdev_pad_ops, -}; - -static int rdacm20_initialize(struct rdacm20_device *dev) +static int rdacm20_post_register(struct v4l2_subdev *sd) { + struct rdacm20_device *dev = sd_to_rdacm20(sd); unsigned int retry = 3; int ret; - max9271_wake_up(&dev->serializer); - - /* Serial link disabled during config as it needs a valid pixel clock. */ - ret = max9271_set_serial_link(&dev->serializer, false); - if (ret) - return ret; - - /* - * Ensure that we have a good link configuration before attempting to - * identify the device. - */ - ret = max9271_configure_i2c(&dev->serializer, - MAX9271_I2CSLVSH_469NS_234NS | - MAX9271_I2CSLVTO_1024US | - MAX9271_I2CMSTBT_105KBPS); - if (ret) - return ret; - /* * Hold OV10635 in reset during max9271 configuration. The reset signal * has to be asserted for at least 200 microseconds. @@ -549,6 +517,51 @@ static int rdacm20_initialize(struct rdacm20_device *dev) dev_info(dev->dev, "Identified RDACM20 camera module\n"); + return 0; +} + +static const struct v4l2_subdev_video_ops rdacm20_video_ops = { + .s_stream = rdacm20_s_stream, +}; + +static const struct v4l2_subdev_pad_ops rdacm20_subdev_pad_ops = { + .enum_mbus_code = rdacm20_enum_mbus_code, + .get_fmt = rdacm20_get_fmt, + .set_fmt = rdacm20_get_fmt, +}; + +static const struct v4l2_subdev_core_ops rdacm20_core_ops = { + .post_register = rdacm20_post_register, +}; + +static const struct v4l2_subdev_ops rdacm20_subdev_ops = { + .core = &rdacm20_core_ops, + .video = &rdacm20_video_ops, + .pad = &rdacm20_subdev_pad_ops, +}; + +static int rdacm20_initialize(struct rdacm20_device *dev) +{ + int ret; + + max9271_wake_up(&dev->serializer); + + /* Serial link disabled during config as it needs a valid pixel clock. */ + ret = max9271_set_serial_link(&dev->serializer, false); + if (ret) + return ret; + + /* + * Ensure that we have a good link configuration before attempting to + * identify the device. + */ + ret = max9271_configure_i2c(&dev->serializer, + MAX9271_I2CSLVSH_469NS_234NS | + MAX9271_I2CSLVTO_1024US | + MAX9271_I2CMSTBT_105KBPS); + if (ret) + return ret; + /* * Set reverse channel high threshold to increase noise immunity. * diff --git a/drivers/media/i2c/rdacm21.c b/drivers/media/i2c/rdacm21.c index 12ec5467ed1e..35217782f693 100644 --- a/drivers/media/i2c/rdacm21.c +++ b/drivers/media/i2c/rdacm21.c @@ -315,21 +315,6 @@ static int rdacm21_get_fmt(struct v4l2_subdev *sd, return 0; } -static const struct v4l2_subdev_video_ops rdacm21_video_ops = { - .s_stream = rdacm21_s_stream, -}; - -static const struct v4l2_subdev_pad_ops rdacm21_subdev_pad_ops = { - .enum_mbus_code = rdacm21_enum_mbus_code, - .get_fmt = rdacm21_get_fmt, - .set_fmt = rdacm21_get_fmt, -}; - -static const struct v4l2_subdev_ops rdacm21_subdev_ops = { - .video = &rdacm21_video_ops, - .pad = &rdacm21_subdev_pad_ops, -}; - static void ov10640_power_up(struct rdacm21_device *dev) { /* Enable GPIO0#0 (reset) and GPIO1#0 (pwdn) as output lines. */ @@ -470,25 +455,11 @@ static int ov490_initialize(struct rdacm21_device *dev) return 0; } -static int rdacm21_initialize(struct rdacm21_device *dev) +static int rdacm21_post_register(struct v4l2_subdev *sd) { + struct rdacm21_device *dev = sd_to_rdacm21(sd); int ret; - max9271_wake_up(&dev->serializer); - - /* Enable reverse channel and disable the serial link. */ - ret = max9271_set_serial_link(&dev->serializer, false); - if (ret) - return ret; - - /* Configure I2C bus at 105Kbps speed and configure GMSL. */ - ret = max9271_configure_i2c(&dev->serializer, - MAX9271_I2CSLVSH_469NS_234NS | - MAX9271_I2CSLVTO_1024US | - MAX9271_I2CMSTBT_105KBPS); - if (ret) - return ret; - ret = max9271_verify_id(&dev->serializer); if (ret) return ret; @@ -527,7 +498,45 @@ static int rdacm21_initialize(struct rdacm21_device *dev) return ret; usleep_range(3000, 5000); - ret = ov490_initialize(dev); + return ov490_initialize(dev); +} + +static const struct v4l2_subdev_video_ops rdacm21_video_ops = { + .s_stream = rdacm21_s_stream, +}; + +static const struct v4l2_subdev_pad_ops rdacm21_subdev_pad_ops = { + .enum_mbus_code = rdacm21_enum_mbus_code, + .get_fmt = rdacm21_get_fmt, + .set_fmt = rdacm21_get_fmt, +}; + +static const struct v4l2_subdev_core_ops rdacm21_core_ops = { + .post_register = rdacm21_post_register, +}; + +static const struct v4l2_subdev_ops rdacm21_subdev_ops = { + .core = &rdacm21_core_ops, + .video = &rdacm21_video_ops, + .pad = &rdacm21_subdev_pad_ops, +}; + +static int rdacm21_initialize(struct rdacm21_device *dev) +{ + int ret; + + max9271_wake_up(&dev->serializer); + + /* Enable reverse channel and disable the serial link. */ + ret = max9271_set_serial_link(&dev->serializer, false); + if (ret) + return ret; + + /* Configure I2C bus at 105Kbps speed and configure GMSL. */ + ret = max9271_configure_i2c(&dev->serializer, + MAX9271_I2CSLVSH_469NS_234NS | + MAX9271_I2CSLVTO_1024US | + MAX9271_I2CMSTBT_105KBPS); if (ret) return ret;