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Fri, 15 May 2026 10:31:20 -0700 (PDT) From: Arash Golgol To: linux-media@vger.kernel.org Cc: paulk@sys-base.io, mchehab@kernel.org, wens@kernel.org, jernej.skrabec@gmail.com, samuel@sholland.org, laurent.pinchart@ideasonboard.com, linux-sunxi@lists.linux.dev, Arash Golgol Subject: [PATCH v3] media: sun8i-a83t-mipi-csi2: Use V4L2 subdev active state Date: Fri, 15 May 2026 21:01:01 +0330 Message-Id: <20260515173101.8978-1-arash.golgol@gmail.com> X-Mailer: git-send-email 2.34.1 Precedence: bulk X-Mailing-List: linux-sunxi@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-MORS-Enabled: yes X-MORS-DOMAIN: patchwork.local X-MORS-HOSTING: hosting172546 X-MORS-USER: hosting172546 X-getmail-retrieved-from-mailbox: =?utf-8?q?INBOX?= Use the V4L2 subdev active state API to store the active format. This simplifies the driver not only by dropping the bridge mbus_format field, but it also allows dropping the bridge lock, replaced with the state lock. The sun8i-a83t-mipi-csi2 hardware does not perform any format conversion. Enforce identical formats on the sink and source pads in the set_fmt() and init_state() callbacks. Signed-off-by: Arash Golgol Reviewed-by: Paul Kocialkowski Tested-by: Paul Kocialkowski --- Changes in v3: - Fix active state lock leak on runtime PM error path Changes in v2: - Initialize active state before calling v4l2_subdev_state_get_format() - Fix line wrapping reported by checkpatch - Link to media-ci report: https://linux-media.pages.freedesktop.org/-/users/patchwork/-/jobs/99865145/artifacts/report.htm .../sun8i_a83t_mipi_csi2.c | 113 +++++++++--------- .../sun8i_a83t_mipi_csi2.h | 2 - 2 files changed, 56 insertions(+), 59 deletions(-) diff --git a/drivers/media/platform/sunxi/sun8i-a83t-mipi-csi2/sun8i_a83t_mipi_csi2.c b/drivers/media/platform/sunxi/sun8i-a83t-mipi-csi2/sun8i_a83t_mipi_csi2.c index dbc51daa4fe3..2b7635f3952d 100644 --- a/drivers/media/platform/sunxi/sun8i-a83t-mipi-csi2/sun8i_a83t_mipi_csi2.c +++ b/drivers/media/platform/sunxi/sun8i-a83t-mipi-csi2/sun8i_a83t_mipi_csi2.c @@ -144,12 +144,12 @@ sun8i_a83t_mipi_csi2_disable(struct sun8i_a83t_mipi_csi2_device *csi2_dev) } static void -sun8i_a83t_mipi_csi2_configure(struct sun8i_a83t_mipi_csi2_device *csi2_dev) +sun8i_a83t_mipi_csi2_configure(struct sun8i_a83t_mipi_csi2_device *csi2_dev, + const struct v4l2_mbus_framefmt *mbus_format) { struct regmap *regmap = csi2_dev->regmap; unsigned int lanes_count = csi2_dev->bridge.endpoint.bus.mipi_csi2.num_data_lanes; - struct v4l2_mbus_framefmt *mbus_format = &csi2_dev->bridge.mbus_format; const struct sun8i_a83t_mipi_csi2_format *format; struct device *dev = csi2_dev->dev; u32 version = 0; @@ -205,7 +205,8 @@ static int sun8i_a83t_mipi_csi2_s_stream(struct v4l2_subdev *subdev, int on) struct v4l2_subdev *source_subdev = csi2_dev->bridge.source_subdev; union phy_configure_opts dphy_opts = { 0 }; struct phy_configure_opts_mipi_dphy *dphy_cfg = &dphy_opts.mipi_dphy; - struct v4l2_mbus_framefmt *mbus_format = &csi2_dev->bridge.mbus_format; + struct v4l2_subdev_state *state; + const struct v4l2_mbus_framefmt *mbus_format; const struct sun8i_a83t_mipi_csi2_format *format; struct phy *dphy = csi2_dev->dphy; struct device *dev = csi2_dev->dev; @@ -215,8 +216,12 @@ static int sun8i_a83t_mipi_csi2_s_stream(struct v4l2_subdev *subdev, int on) unsigned long pixel_rate; int ret; - if (!source_subdev) - return -ENODEV; + state = v4l2_subdev_lock_and_get_active_state(subdev); + + if (!source_subdev) { + ret = -ENODEV; + goto unlock; + } if (!on) { v4l2_subdev_call(source_subdev, video, s_stream, 0); @@ -228,7 +233,7 @@ static int sun8i_a83t_mipi_csi2_s_stream(struct v4l2_subdev *subdev, int on) ret = pm_runtime_resume_and_get(dev); if (ret < 0) - return ret; + goto unlock; /* Sensor pixel rate */ @@ -254,6 +259,9 @@ static int sun8i_a83t_mipi_csi2_s_stream(struct v4l2_subdev *subdev, int on) goto error_pm; } + mbus_format = + v4l2_subdev_state_get_format(state, + SUN8I_A83T_MIPI_CSI2_PAD_SINK); format = sun8i_a83t_mipi_csi2_format_find(mbus_format->code); if (WARN_ON(!format)) { ret = -ENODEV; @@ -292,7 +300,7 @@ static int sun8i_a83t_mipi_csi2_s_stream(struct v4l2_subdev *subdev, int on) /* Controller */ - sun8i_a83t_mipi_csi2_configure(csi2_dev); + sun8i_a83t_mipi_csi2_configure(csi2_dev, mbus_format); sun8i_a83t_mipi_csi2_enable(csi2_dev); /* D-PHY */ @@ -309,7 +317,8 @@ static int sun8i_a83t_mipi_csi2_s_stream(struct v4l2_subdev *subdev, int on) if (ret && ret != -ENOIOCTLCMD) goto disable; - return 0; + ret = 0; + goto unlock; disable: phy_power_off(dphy); @@ -318,6 +327,8 @@ static int sun8i_a83t_mipi_csi2_s_stream(struct v4l2_subdev *subdev, int on) error_pm: pm_runtime_put(dev); +unlock: + v4l2_subdev_unlock_state(state); return ret; } @@ -341,22 +352,24 @@ sun8i_a83t_mipi_csi2_mbus_format_prepare(struct v4l2_mbus_framefmt *mbus_format) static int sun8i_a83t_mipi_csi2_init_state(struct v4l2_subdev *subdev, struct v4l2_subdev_state *state) { - struct sun8i_a83t_mipi_csi2_device *csi2_dev = - v4l2_get_subdevdata(subdev); - unsigned int pad = SUN8I_A83T_MIPI_CSI2_PAD_SINK; - struct v4l2_mbus_framefmt *mbus_format = - v4l2_subdev_state_get_format(state, pad); - struct mutex *lock = &csi2_dev->bridge.lock; + unsigned int pad; - mutex_lock(lock); + /* + * This subdev does not perform format conversion, + * initialize both pads identically. + */ + for (pad = 0; pad < subdev->entity.num_pads; pad++) { + struct v4l2_mbus_framefmt *mbus_format; - mbus_format->code = sun8i_a83t_mipi_csi2_formats[0].mbus_code; - mbus_format->width = 640; - mbus_format->height = 480; + mbus_format = v4l2_subdev_state_get_format(state, pad); + + mbus_format->code = sun8i_a83t_mipi_csi2_formats[0].mbus_code; + mbus_format->width = 640; + mbus_format->height = 480; - sun8i_a83t_mipi_csi2_mbus_format_prepare(mbus_format); + sun8i_a83t_mipi_csi2_mbus_format_prepare(mbus_format); + } - mutex_unlock(lock); return 0; } @@ -375,55 +388,33 @@ sun8i_a83t_mipi_csi2_enum_mbus_code(struct v4l2_subdev *subdev, return 0; } -static int sun8i_a83t_mipi_csi2_get_fmt(struct v4l2_subdev *subdev, - struct v4l2_subdev_state *state, - struct v4l2_subdev_format *format) -{ - struct sun8i_a83t_mipi_csi2_device *csi2_dev = - v4l2_get_subdevdata(subdev); - struct v4l2_mbus_framefmt *mbus_format = &format->format; - struct mutex *lock = &csi2_dev->bridge.lock; - - mutex_lock(lock); - - if (format->which == V4L2_SUBDEV_FORMAT_TRY) - *mbus_format = *v4l2_subdev_state_get_format(state, - format->pad); - else - *mbus_format = csi2_dev->bridge.mbus_format; - - mutex_unlock(lock); - - return 0; -} - static int sun8i_a83t_mipi_csi2_set_fmt(struct v4l2_subdev *subdev, struct v4l2_subdev_state *state, struct v4l2_subdev_format *format) { - struct sun8i_a83t_mipi_csi2_device *csi2_dev = - v4l2_get_subdevdata(subdev); - struct v4l2_mbus_framefmt *mbus_format = &format->format; - struct mutex *lock = &csi2_dev->bridge.lock; + struct v4l2_mbus_framefmt *fmt; - mutex_lock(lock); + /* The format on the source pad always matches the sink pad. */ + if (format->pad != SUN8I_A83T_MIPI_CSI2_PAD_SINK) + return v4l2_subdev_get_fmt(subdev, state, format); - sun8i_a83t_mipi_csi2_mbus_format_prepare(mbus_format); + sun8i_a83t_mipi_csi2_mbus_format_prepare(&format->format); - if (format->which == V4L2_SUBDEV_FORMAT_TRY) - *v4l2_subdev_state_get_format(state, format->pad) = - *mbus_format; - else - csi2_dev->bridge.mbus_format = *mbus_format; + /* Set the format on the sink pad. */ + fmt = v4l2_subdev_state_get_format(state, format->pad); + *fmt = format->format; - mutex_unlock(lock); + /* Propagate the format to the source pad. */ + fmt = v4l2_subdev_state_get_format(state, + SUN8I_A83T_MIPI_CSI2_PAD_SOURCE); + *fmt = format->format; return 0; } static const struct v4l2_subdev_pad_ops sun8i_a83t_mipi_csi2_pad_ops = { .enum_mbus_code = sun8i_a83t_mipi_csi2_enum_mbus_code, - .get_fmt = sun8i_a83t_mipi_csi2_get_fmt, + .get_fmt = v4l2_subdev_get_fmt, .set_fmt = sun8i_a83t_mipi_csi2_set_fmt, }; @@ -540,8 +531,6 @@ sun8i_a83t_mipi_csi2_bridge_setup(struct sun8i_a83t_mipi_csi2_device *csi2_dev) bool notifier_registered = false; int ret; - mutex_init(&bridge->lock); - /* V4L2 Subdev */ v4l2_subdev_init(subdev, &sun8i_a83t_mipi_csi2_subdev_ops); @@ -570,6 +559,12 @@ sun8i_a83t_mipi_csi2_bridge_setup(struct sun8i_a83t_mipi_csi2_device *csi2_dev) if (ret) return ret; + /* V4L2 Subdev finalize */ + + ret = v4l2_subdev_init_finalize(subdev); + if (ret < 0) + goto error_media_entity_cleanup; + /* V4L2 Async */ v4l2_async_subdev_nf_init(notifier, subdev); @@ -603,6 +598,9 @@ sun8i_a83t_mipi_csi2_bridge_setup(struct sun8i_a83t_mipi_csi2_device *csi2_dev) error_v4l2_notifier_cleanup: v4l2_async_nf_cleanup(notifier); + v4l2_subdev_cleanup(subdev); + +error_media_entity_cleanup: media_entity_cleanup(&subdev->entity); return ret; @@ -617,6 +615,7 @@ sun8i_a83t_mipi_csi2_bridge_cleanup(struct sun8i_a83t_mipi_csi2_device *csi2_dev v4l2_async_unregister_subdev(subdev); v4l2_async_nf_unregister(notifier); v4l2_async_nf_cleanup(notifier); + v4l2_subdev_cleanup(subdev); media_entity_cleanup(&subdev->entity); } diff --git a/drivers/media/platform/sunxi/sun8i-a83t-mipi-csi2/sun8i_a83t_mipi_csi2.h b/drivers/media/platform/sunxi/sun8i-a83t-mipi-csi2/sun8i_a83t_mipi_csi2.h index f1e64c53434c..819527bcd64d 100644 --- a/drivers/media/platform/sunxi/sun8i-a83t-mipi-csi2/sun8i_a83t_mipi_csi2.h +++ b/drivers/media/platform/sunxi/sun8i-a83t-mipi-csi2/sun8i_a83t_mipi_csi2.h @@ -33,8 +33,6 @@ struct sun8i_a83t_mipi_csi2_bridge { struct media_pad pads[SUN8I_A83T_MIPI_CSI2_PAD_COUNT]; struct v4l2_fwnode_endpoint endpoint; struct v4l2_async_notifier notifier; - struct v4l2_mbus_framefmt mbus_format; - struct mutex lock; /* Mbus format lock. */ struct v4l2_subdev *source_subdev; };