From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from perceval.ideasonboard.com (perceval.ideasonboard.com [213.167.242.64]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id A1E30324B35 for ; Mon, 9 Feb 2026 10:04:11 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=213.167.242.64 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1770631452; cv=none; b=ppobKu6T0S9FkoO3WzmrDTH3l+83MaRW3q0pwWCEME/raTTRgNum1HJV9NHEq2alIfEUKNvjSDpd7qOVCnIoNr3N/F2MeVH9b9EiPVSHqomoHpuMQVI/irEKsAMvMqXHREiI0geL0Hw/tCjzVp/9iaiQBVkyEA/Sd+NMx/G2r0s= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1770631452; c=relaxed/simple; bh=gpUNWEX8GdohtG1lVrXF23uPge+LB4c1cYXD3ZVzqnY=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=cqeHRVlLpGWXx+XhZvnW0wH9XY4/jItAZa92Lnd9QVdIPMHVnQMdJb64xrfWgX3I1U+5/RUBMRPpx8uosjjMN5C7XSp5j7GiSGvBTfiFPSRdM+hZ9YZx4t9F+WnM54Sa6IVWJbnqFwJloeZ+IDD56/59E/WeAfX/UwBJ6YsM7C4= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=ideasonboard.com; spf=pass smtp.mailfrom=ideasonboard.com; dkim=pass (1024-bit key) header.d=ideasonboard.com header.i=@ideasonboard.com header.b=kfeZ60HU; arc=none smtp.client-ip=213.167.242.64 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=ideasonboard.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=ideasonboard.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=ideasonboard.com header.i=@ideasonboard.com header.b="kfeZ60HU" Received: from killaraus.ideasonboard.com (2001-14ba-703d-e500--2a1.rev.dnainternet.fi [IPv6:2001:14ba:703d:e500::2a1]) by perceval.ideasonboard.com (Postfix) with UTF8SMTPSA id E86AB63F; Mon, 9 Feb 2026 11:03:23 +0100 (CET) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=ideasonboard.com; s=mail; t=1770631404; bh=gpUNWEX8GdohtG1lVrXF23uPge+LB4c1cYXD3ZVzqnY=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=kfeZ60HUueKcUDzAJn446nIHr77hanVRCT9N+H5Adv38Mk1LUiCVeqwd50e8W9SmV X2uAHkww6rVbXFLj8LMIWbG5Q7jLapnLev+/ch9ybG7vHred3JmH53724xpiNQXVQC 7W0cijGqc+Q8zcDRGZX9OoiSNKhZOy21ty3DyP78= Date: Mon, 9 Feb 2026 12:04:08 +0200 From: Laurent Pinchart To: Arash Golgol Cc: linux-media@vger.kernel.org, paulk@sys-base.io, mchehab@kernel.org, wens@kernel.org, jernej.skrabec@gmail.com, samuel@sholland.org, linux-sunxi@lists.linux.dev Subject: Re: [PATCH v2] media: sun6i-mipi-csi2: Use V4L2 subdev active state Message-ID: <20260209100408.GC2302514@killaraus.ideasonboard.com> References: <20260209055529.16644-1-arash.golgol@gmail.com> Precedence: bulk X-Mailing-List: linux-sunxi@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline In-Reply-To: <20260209055529.16644-1-arash.golgol@gmail.com> Hi Arash, Thank you for the patch. On Mon, Feb 09, 2026 at 09:25:29AM +0330, Arash Golgol wrote: > 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 sun6i-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 > --- > Changes in v2: > - Simplify control flow by dropping the else at end of s_stream() > - Call v4l2_subdev_cleanup() on bridge setup failure before > notifier registration > > .../sunxi/sun6i-mipi-csi2/sun6i_mipi_csi2.c | 110 +++++++++--------- > .../sunxi/sun6i-mipi-csi2/sun6i_mipi_csi2.h | 2 - > 2 files changed, 55 insertions(+), 57 deletions(-) > > diff --git a/drivers/media/platform/sunxi/sun6i-mipi-csi2/sun6i_mipi_csi2.c b/drivers/media/platform/sunxi/sun6i-mipi-csi2/sun6i_mipi_csi2.c > index b06cb73015cd..f4d1f876dac8 100644 > --- a/drivers/media/platform/sunxi/sun6i-mipi-csi2/sun6i_mipi_csi2.c > +++ b/drivers/media/platform/sunxi/sun6i-mipi-csi2/sun6i_mipi_csi2.c > @@ -95,12 +95,12 @@ static void sun6i_mipi_csi2_disable(struct sun6i_mipi_csi2_device *csi2_dev) > SUN6I_MIPI_CSI2_CTL_EN, 0); > } > > -static void sun6i_mipi_csi2_configure(struct sun6i_mipi_csi2_device *csi2_dev) > +static void sun6i_mipi_csi2_configure(struct sun6i_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 sun6i_mipi_csi2_format *format; > struct device *dev = csi2_dev->dev; > u32 version = 0; > @@ -173,7 +173,8 @@ static int sun6i_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 sun6i_mipi_csi2_format *format; > struct phy *dphy = csi2_dev->dphy; > struct device *dev = csi2_dev->dev; > @@ -183,8 +184,12 @@ static int sun6i_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); > @@ -196,7 +201,7 @@ static int sun6i_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 */ > > @@ -222,6 +227,8 @@ static int sun6i_mipi_csi2_s_stream(struct v4l2_subdev *subdev, int on) > goto error_pm; > } > > + mbus_format = v4l2_subdev_state_get_format(state, > + SUN6I_MIPI_CSI2_PAD_SINK); > format = sun6i_mipi_csi2_format_find(mbus_format->code); > if (WARN_ON(!format)) { > ret = -ENODEV; > @@ -260,7 +267,7 @@ static int sun6i_mipi_csi2_s_stream(struct v4l2_subdev *subdev, int on) > > /* Controller */ > > - sun6i_mipi_csi2_configure(csi2_dev); > + sun6i_mipi_csi2_configure(csi2_dev, mbus_format); > sun6i_mipi_csi2_enable(csi2_dev); > > /* D-PHY */ > @@ -277,7 +284,8 @@ static int sun6i_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); > @@ -286,6 +294,8 @@ static int sun6i_mipi_csi2_s_stream(struct v4l2_subdev *subdev, int on) > error_pm: > pm_runtime_put(dev); > > +unlock: > + v4l2_subdev_unlock_state(state); > return ret; > } > > @@ -308,21 +318,23 @@ sun6i_mipi_csi2_mbus_format_prepare(struct v4l2_mbus_framefmt *mbus_format) > static int sun6i_mipi_csi2_init_state(struct v4l2_subdev *subdev, > struct v4l2_subdev_state *state) > { > - struct sun6i_mipi_csi2_device *csi2_dev = v4l2_get_subdevdata(subdev); > - unsigned int pad = SUN6I_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 = sun6i_mipi_csi2_formats[0].mbus_code; > - mbus_format->width = 640; > - mbus_format->height = 480; > + mbus_format = v4l2_subdev_state_get_format(state, pad); > > - sun6i_mipi_csi2_mbus_format_prepare(mbus_format); > + mbus_format->code = sun6i_mipi_csi2_formats[0].mbus_code; > + mbus_format->width = 640; > + mbus_format->height = 480; > > - mutex_unlock(lock); > + sun6i_mipi_csi2_mbus_format_prepare(mbus_format); > + } > > return 0; > } > @@ -340,53 +352,32 @@ sun6i_mipi_csi2_enum_mbus_code(struct v4l2_subdev *subdev, > return 0; > } > > -static int sun6i_mipi_csi2_get_fmt(struct v4l2_subdev *subdev, > - struct v4l2_subdev_state *state, > - struct v4l2_subdev_format *format) > -{ > - struct sun6i_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 sun6i_mipi_csi2_set_fmt(struct v4l2_subdev *subdev, > struct v4l2_subdev_state *state, > struct v4l2_subdev_format *format) > { > - struct sun6i_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 != SUN6I_MIPI_CSI2_PAD_SINK) > + return v4l2_subdev_get_fmt(subdev, state, format); > > - sun6i_mipi_csi2_mbus_format_prepare(mbus_format); > + sun6i_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, SUN6I_MIPI_CSI2_PAD_SOURCE); > + *fmt = format->format; > > return 0; > } > > static const struct v4l2_subdev_pad_ops sun6i_mipi_csi2_pad_ops = { > .enum_mbus_code = sun6i_mipi_csi2_enum_mbus_code, > - .get_fmt = sun6i_mipi_csi2_get_fmt, > + .get_fmt = v4l2_subdev_get_fmt, > .set_fmt = sun6i_mipi_csi2_set_fmt, > }; > > @@ -502,8 +493,6 @@ static int sun6i_mipi_csi2_bridge_setup(struct sun6i_mipi_csi2_device *csi2_dev) > bool notifier_registered = false; > int ret; > > - mutex_init(&bridge->lock); > - > /* V4L2 Subdev */ > > v4l2_subdev_init(subdev, &sun6i_mipi_csi2_subdev_ops); > @@ -532,6 +521,12 @@ static int sun6i_mipi_csi2_bridge_setup(struct sun6i_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); > @@ -539,7 +534,7 @@ static int sun6i_mipi_csi2_bridge_setup(struct sun6i_mipi_csi2_device *csi2_dev) > > ret = sun6i_mipi_csi2_bridge_source_setup(csi2_dev); > if (ret && ret != -ENODEV) > - goto error_v4l2_notifier_cleanup; > + goto error_v4l2_subdev_cleanup; On second thought, I wonder if we shouldn't keep jumping to error_v4l2_notifier_cleanup. v4l2_async_subdev_nf_init() is called above, and even though no async subdev will be added to the notifier if sun6i_mipi_csi2_bridge_source_setup() fails, I think calling v4l2_async_nf_cleanup() will be more future-proof in case the v4l2_async_subdev_nf_init() implementation changes to require a cleanup call unconditionally. This is a minor issue, and I'm fine with the current version of the patch too if that's preferred by the majority, so Reviewed-by: Laurent Pinchart If you want to modify the goto, I recommend waiting a few days first for Paul to review the patch before submitting a v3. > > /* Only register the notifier when a sensor is connected. */ > if (ret != -ENODEV) { > @@ -565,6 +560,10 @@ static int sun6i_mipi_csi2_bridge_setup(struct sun6i_mipi_csi2_device *csi2_dev) > error_v4l2_notifier_cleanup: > v4l2_async_nf_cleanup(notifier); > > +error_v4l2_subdev_cleanup: > + v4l2_subdev_cleanup(subdev); > + > +error_media_entity_cleanup: > media_entity_cleanup(&subdev->entity); > > return ret; > @@ -579,6 +578,7 @@ sun6i_mipi_csi2_bridge_cleanup(struct sun6i_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/sun6i-mipi-csi2/sun6i_mipi_csi2.h b/drivers/media/platform/sunxi/sun6i-mipi-csi2/sun6i_mipi_csi2.h > index 24b15e34b5e8..d72dfbd6a993 100644 > --- a/drivers/media/platform/sunxi/sun6i-mipi-csi2/sun6i_mipi_csi2.h > +++ b/drivers/media/platform/sunxi/sun6i-mipi-csi2/sun6i_mipi_csi2.h > @@ -32,8 +32,6 @@ struct sun6i_mipi_csi2_bridge { > struct media_pad pads[SUN6I_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; > }; -- Regards, Laurent Pinchart