linux-kernel - Re: [PATCH v3 7/9] media: subdev: Support privacy led in v4l2_subdev_enable/disable

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Date: Thu, 11 Apr 2024 10:28:39 +0530
From: Umang Jain <umang.jain@...asonboard.com>
To: Tomi Valkeinen <tomi.valkeinen@...asonboard.com>,
 Mauro Carvalho Chehab <mchehab@...nel.org>, Hans Verkuil
 <hverkuil@...all.nl>, Laurent Pinchart <laurent.pinchart@...asonboard.com>,
 Sakari Ailus <sakari.ailus@...ux.intel.com>
Cc: linux-media@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 7/9] media: subdev: Support privacy led in
 v4l2_subdev_enable/disable_streams()

Hi Tomi,

Thank you for the patch.

On 10/04/24 6:05 pm, Tomi Valkeinen wrote:
> We support camera privacy leds with the .s_stream, in call_s_stream, but
> we don't have that support when the subdevice implements
> .enable/disable_streams.
>
> Add the support by enabling the led when the first stream for a
> subdevice is enabled, and disabling the led then the last stream is
> disabled.
>
> Signed-off-by: Tomi Valkeinen <tomi.valkeinen@...asonboard.com>

Reviewed-by: Umang Jain <umang.jain@...asonboard.com>

> ---
>   drivers/media/v4l2-core/v4l2-subdev.c | 9 +++++++++
>   1 file changed, 9 insertions(+)
>
> diff --git a/drivers/media/v4l2-core/v4l2-subdev.c b/drivers/media/v4l2-core/v4l2-subdev.c
> index 20b5a00cbeeb..f44aaa4e1fab 100644
> --- a/drivers/media/v4l2-core/v4l2-subdev.c
> +++ b/drivers/media/v4l2-core/v4l2-subdev.c
> @@ -2150,6 +2150,7 @@ int v4l2_subdev_enable_streams(struct v4l2_subdev *sd, u32 pad,
>   {
>   	struct device *dev = sd->entity.graph_obj.mdev->dev;
>   	struct v4l2_subdev_state *state;
> +	bool already_streaming;
>   	u64 found_streams = 0;
>   	unsigned int i;
>   	int ret;
> @@ -2198,6 +2199,8 @@ int v4l2_subdev_enable_streams(struct v4l2_subdev *sd, u32 pad,
>   
>   	dev_dbg(dev, "enable streams %u:%#llx\n", pad, streams_mask);
>   
> +	already_streaming = v4l2_subdev_is_streaming(sd);
> +
>   	/* Call the .enable_streams() operation. */
>   	ret = v4l2_subdev_call(sd, pad, enable_streams, state, pad,
>   			       streams_mask);
> @@ -2216,6 +2219,9 @@ int v4l2_subdev_enable_streams(struct v4l2_subdev *sd, u32 pad,
>   			cfg->enabled = true;
>   	}
>   
> +	if (!already_streaming)
> +		v4l2_subdev_enable_privacy_led(sd);
> +
>   done:
>   	v4l2_subdev_unlock_state(state);
>   
> @@ -2340,6 +2346,9 @@ int v4l2_subdev_disable_streams(struct v4l2_subdev *sd, u32 pad,
>   	}
>   
>   done:
> +	if (!v4l2_subdev_is_streaming(sd))
> +		v4l2_subdev_disable_privacy_led(sd);
> +
>   	v4l2_subdev_unlock_state(state);
>   
>   	return ret;
>