linux-kernel - Re: [PATCH v4 10/10] media: subdev: Support non-routing subdevs in v4l2_subdev_s_stream

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Date: Tue, 16 Apr 2024 13:43:31 +0300
From: Tomi Valkeinen <tomi.valkeinen@...asonboard.com>
To: Umang Jain <umang.jain@...asonboard.com>
Cc: linux-media@...r.kernel.org, linux-kernel@...r.kernel.org,
 Mauro Carvalho Chehab <mchehab@...nel.org>, Hans Verkuil
 <hverkuil@...all.nl>, Laurent Pinchart <laurent.pinchart@...asonboard.com>,
 Sakari Ailus <sakari.ailus@...ux.intel.com>
Subject: Re: [PATCH v4 10/10] media: subdev: Support non-routing subdevs in
 v4l2_subdev_s_stream_helper()

Hi,

On 16/04/2024 13:40, Tomi Valkeinen wrote:
> At the moment v4l2_subdev_s_stream_helper() only works for subdevices
> that support routing. As enable/disable_streams now also works for
> subdevices without routing, improve v4l2_subdev_s_stream_helper() to do
> the same.

I forgot to mention, I have not tested this patch as I don't have a HW 
setup. And, of course, I now see that it has a bug. The BIT_ULL(1) 
should be BIT_ULL(0).

Umang, can you try a fixed one on your side? If it works, I'll send a v5.

  Tomi

> Signed-off-by: Tomi Valkeinen <tomi.valkeinen@...asonboard.com>
> ---
>   drivers/media/v4l2-core/v4l2-subdev.c | 23 ++++++++++++++++-------
>   1 file changed, 16 insertions(+), 7 deletions(-)
> 
> diff --git a/drivers/media/v4l2-core/v4l2-subdev.c b/drivers/media/v4l2-core/v4l2-subdev.c
> index 1c6b305839a1..83ebcde54a34 100644
> --- a/drivers/media/v4l2-core/v4l2-subdev.c
> +++ b/drivers/media/v4l2-core/v4l2-subdev.c
> @@ -2360,15 +2360,24 @@ int v4l2_subdev_s_stream_helper(struct v4l2_subdev *sd, int enable)
>   	if (WARN_ON(pad_index == -1))
>   		return -EINVAL;
>   
> -	/*
> -	 * As there's a single source pad, just collect all the source streams.
> -	 */
> -	state = v4l2_subdev_lock_and_get_active_state(sd);
> +	if (sd->flags & V4L2_SUBDEV_FL_STREAMS) {
> +		/*
> +		 * As there's a single source pad, just collect all the source
> +		 * streams.
> +		 */
> +		state = v4l2_subdev_lock_and_get_active_state(sd);
>   
> -	for_each_active_route(&state->routing, route)
> -		source_mask |= BIT_ULL(route->source_stream);
> +		for_each_active_route(&state->routing, route)
> +			source_mask |= BIT_ULL(route->source_stream);
>   
> -	v4l2_subdev_unlock_state(state);
> +		v4l2_subdev_unlock_state(state);
> +	} else {
> +		/*
> +		 * For non-streams subdevices, there's a single implicit stream
> +		 * per pad.
> +		 */
> +		source_mask = BIT_ULL(1);
> +	}
>   
>   	if (enable)
>   		return v4l2_subdev_enable_streams(sd, pad_index, source_mask);
>