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smtp.subspace.kernel.org; dmarc=none (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=ALOykq+P; arc=none smtp.client-ip=213.167.242.64 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (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="ALOykq+P" Received: from [192.168.88.20] (91-154-34-181.elisa-laajakaista.fi [91.154.34.181]) by perceval.ideasonboard.com (Postfix) with ESMTPSA id BD8E312D; Thu, 4 Apr 2024 13:29:31 +0200 (CEST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=ideasonboard.com; s=mail; t=1712230172; bh=f7DsGYbNl7ulaDDJJd9oWmrMf7x5Qu/bOWNKDKTXiis=; h=Date:Subject:To:Cc:References:From:In-Reply-To:From; b=ALOykq+PKf3bOWlHZWsDZWffdGiJiSJIrMCdYLJdwElA9cqM0YFFYo2Aj9QxzuFX2 +AgfJ1zs6LpVg4hmE+iMXwbu0ECxGACiAeuGLZX0bA/HA64PYVMwdbV22qhzSXtvSN c5s03lVVPM4hbYCPUwx3qQbu3xlCRtdcvO7mfDuo= Message-ID: <64f9e323-cc2c-4d04-ba07-a747973db136@ideasonboard.com> Date: Thu, 4 Apr 2024 14:30:06 +0300 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH 1/4] media: subdev: Add checks for subdev features To: Sakari Ailus Cc: Mauro Carvalho Chehab , Hans Verkuil , Laurent Pinchart , Umang Jain , linux-media@vger.kernel.org, linux-kernel@vger.kernel.org References: <20240404-enable-streams-impro-v1-0-1017a35bbe07@ideasonboard.com> <20240404-enable-streams-impro-v1-1-1017a35bbe07@ideasonboard.com> Content-Language: en-US From: Tomi Valkeinen Autocrypt: addr=tomi.valkeinen@ideasonboard.com; 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charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit On 04/04/2024 14:09, Sakari Ailus wrote: > Moi, > > On Thu, Apr 04, 2024 at 01:50:00PM +0300, Tomi Valkeinen wrote: >> Add some checks to verify that the subdev driver implements required >> features. >> >> A subdevice that supports streams (V4L2_SUBDEV_FL_STREAMS) must do one >> of the following: >> >> - Implement neither .enable/disable_streams() nor .s_stream(), if the >> subdev is part of a video driver that uses an internal method to >> enable the subdev. >> - Implement only .enable/disable_streams(), if support for legacy >> sink-side subdevices is not needed. >> - Implement .enable/disable_streams() and .s_stream(), if support for >> legacy sink-side subdevices is needed. >> >> At the moment the framework doesn't check this requirement. Add the >> check. >> >> Signed-off-by: Tomi Valkeinen >> --- >> drivers/media/v4l2-core/v4l2-subdev.c | 27 +++++++++++++++++++++++++++ >> 1 file changed, 27 insertions(+) >> >> diff --git a/drivers/media/v4l2-core/v4l2-subdev.c b/drivers/media/v4l2-core/v4l2-subdev.c >> index 4c6198c48dd6..b90b5185e87f 100644 >> --- a/drivers/media/v4l2-core/v4l2-subdev.c >> +++ b/drivers/media/v4l2-core/v4l2-subdev.c >> @@ -1519,6 +1519,33 @@ int __v4l2_subdev_init_finalize(struct v4l2_subdev *sd, const char *name, >> struct lock_class_key *key) >> { >> struct v4l2_subdev_state *state; >> + struct device *dev = sd->dev; >> + bool has_disable_streams; >> + bool has_enable_streams; >> + bool has_s_stream; >> + >> + /* Check that the subdevice implements the required features */ >> + >> + has_s_stream = sd->ops && sd->ops->video && sd->ops->video->s_stream; >> + has_enable_streams = sd->ops && sd->ops->pad && sd->ops->pad->enable_streams; >> + has_disable_streams = sd->ops && sd->ops->pad && sd->ops->pad->disable_streams; > > There is v4l2_subdev_has_op(). Please also run: > > ./scripts/checkpatch.pl --strict --max-line-length=80 > > on this. > >> + >> + if (has_enable_streams != has_disable_streams) { >> + dev_err(dev, >> + "subdev '%s' must implement both or neither of .enable_streams() and .disable_streams()\n", >> + sd->name); >> + return -EINVAL; >> + } >> + >> + if (sd->flags & V4L2_SUBDEV_FL_STREAMS) { >> + if (has_s_stream && !has_enable_streams) { > > Is the s_stream callback allowed to be something else than NULL or > v4l2_subdev_s_stream_helper? v4l2_subdev_s_stream_helper() only supports subdevs with a single source pad. The driver can implement its own version. Tomi