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Message-ID: <7483a57b-b499-49bb-bd10-cdcf311a8470@xs4all.nl>
Date: Wed, 24 Apr 2024 10:41:44 +0200
From: Hans Verkuil <hverkuil@...all.nl>
To: Tomi Valkeinen <tomi.valkeinen@...asonboard.com>,
Mauro Carvalho Chehab <mchehab@...nel.org>,
Laurent Pinchart <laurent.pinchart@...asonboard.com>,
Sakari Ailus <sakari.ailus@...ux.intel.com>,
Umang Jain <umang.jain@...asonboard.com>
Cc: linux-media@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v5 08/10] media: subdev: Refactor
v4l2_subdev_enable/disable_streams()
On 16/04/2024 15:55, Tomi Valkeinen wrote:
> Add two internal helper functions, v4l2_subdev_collect_streams() and
> v4l2_subdev_set_streams_enabled(), which allows us to refactor
> v4l2_subdev_enable/disable_streams() functions.
>
> This (I think) makes the code a bit easier to read, and lets us more
> easily add new functionality in the helper functions in the following
> patch.
>
> Reviewed-by: Laurent Pinchart <laurent.pinchart@...asonboard.com>
> Signed-off-by: Tomi Valkeinen <tomi.valkeinen@...asonboard.com>
> ---
> drivers/media/v4l2-core/v4l2-subdev.c | 109 +++++++++++++++++++---------------
> 1 file changed, 60 insertions(+), 49 deletions(-)
>
> diff --git a/drivers/media/v4l2-core/v4l2-subdev.c b/drivers/media/v4l2-core/v4l2-subdev.c
> index 38388b223564..e45fd42da1e3 100644
> --- a/drivers/media/v4l2-core/v4l2-subdev.c
> +++ b/drivers/media/v4l2-core/v4l2-subdev.c
> @@ -2100,6 +2100,42 @@ int v4l2_subdev_routing_validate(struct v4l2_subdev *sd,
> }
> EXPORT_SYMBOL_GPL(v4l2_subdev_routing_validate);
>
> +static void v4l2_subdev_collect_streams(struct v4l2_subdev *sd,
> + struct v4l2_subdev_state *state,
> + u32 pad, u64 streams_mask,
> + u64 *found_streams,
> + u64 *enabled_streams)
> +{
> + *found_streams = 0;
> + *enabled_streams = 0;
> +
> + for (unsigned int i = 0; i < state->stream_configs.num_configs; ++i) {
> + const struct v4l2_subdev_stream_config *cfg =
> + &state->stream_configs.configs[i];
> +
> + if (cfg->pad != pad || !(streams_mask & BIT_ULL(cfg->stream)))
> + continue;
> +
> + *found_streams |= BIT_ULL(cfg->stream);
> + if (cfg->enabled)
> + *enabled_streams |= BIT_ULL(cfg->stream);
> + }
> +}
> +
> +static void v4l2_subdev_set_streams_enabled(struct v4l2_subdev *sd,
> + struct v4l2_subdev_state *state,
> + u32 pad, u64 streams_mask,
> + bool enabled)
> +{
> + for (unsigned int i = 0; i < state->stream_configs.num_configs; ++i) {
> + struct v4l2_subdev_stream_config *cfg =
> + &state->stream_configs.configs[i];
> +
> + if (cfg->pad == pad && (streams_mask & BIT_ULL(cfg->stream)))
> + cfg->enabled = enabled;
> + }
> +}
> +
> static int v4l2_subdev_enable_streams_fallback(struct v4l2_subdev *sd, u32 pad,
> u64 streams_mask)
> {
> @@ -2151,8 +2187,8 @@ 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;
> + u64 enabled_streams;
> + u64 found_streams;
> int ret;
>
> /* A few basic sanity checks first. */
> @@ -2173,22 +2209,9 @@ int v4l2_subdev_enable_streams(struct v4l2_subdev *sd, u32 pad,
> * Verify that the requested streams exist and that they are not
> * already enabled.
> */
> - for (i = 0; i < state->stream_configs.num_configs; ++i) {
> - struct v4l2_subdev_stream_config *cfg =
> - &state->stream_configs.configs[i];
>
> - if (cfg->pad != pad || !(streams_mask & BIT_ULL(cfg->stream)))
> - continue;
> -
> - found_streams |= BIT_ULL(cfg->stream);
> -
> - if (cfg->enabled) {
> - dev_dbg(dev, "stream %u already enabled on %s:%u\n",
> - cfg->stream, sd->entity.name, pad);
> - ret = -EALREADY;
> - goto done;
> - }
> - }
> + v4l2_subdev_collect_streams(sd, state, pad, streams_mask,
> + &found_streams, &enabled_streams);
>
> if (found_streams != streams_mask) {
> dev_dbg(dev, "streams 0x%llx not found on %s:%u\n",
> @@ -2197,6 +2220,13 @@ int v4l2_subdev_enable_streams(struct v4l2_subdev *sd, u32 pad,
> goto done;
> }
>
> + if (enabled_streams) {
> + dev_dbg(dev, "streams 0x%llx already enabled on %s:%u\n",
> + enabled_streams, sd->entity.name, pad);
> + ret = -EINVAL;
> + goto done;
> + }
> +
> dev_dbg(dev, "enable streams %u:%#llx\n", pad, streams_mask);
>
> already_streaming = v4l2_subdev_is_streaming(sd);
> @@ -2211,13 +2241,7 @@ int v4l2_subdev_enable_streams(struct v4l2_subdev *sd, u32 pad,
> }
>
> /* Mark the streams as enabled. */
> - for (i = 0; i < state->stream_configs.num_configs; ++i) {
> - struct v4l2_subdev_stream_config *cfg =
> - &state->stream_configs.configs[i];
> -
> - if (cfg->pad == pad && (streams_mask & BIT_ULL(cfg->stream)))
> - cfg->enabled = true;
> - }
> + v4l2_subdev_set_streams_enabled(sd, state, pad, streams_mask, true);
>
> if (!already_streaming)
> v4l2_subdev_enable_privacy_led(sd);
> @@ -2279,8 +2303,8 @@ int v4l2_subdev_disable_streams(struct v4l2_subdev *sd, u32 pad,
> {
> struct device *dev = sd->entity.graph_obj.mdev->dev;
> struct v4l2_subdev_state *state;
> - u64 found_streams = 0;
> - unsigned int i;
> + u64 enabled_streams;
> + u64 found_streams;
> int ret;
>
> /* A few basic sanity checks first. */
> @@ -2301,22 +2325,9 @@ int v4l2_subdev_disable_streams(struct v4l2_subdev *sd, u32 pad,
> * Verify that the requested streams exist and that they are not
> * already disabled.
> */
> - for (i = 0; i < state->stream_configs.num_configs; ++i) {
> - struct v4l2_subdev_stream_config *cfg =
> - &state->stream_configs.configs[i];
> -
> - if (cfg->pad != pad || !(streams_mask & BIT_ULL(cfg->stream)))
> - continue;
>
> - found_streams |= BIT_ULL(cfg->stream);
> -
> - if (!cfg->enabled) {
> - dev_dbg(dev, "stream %u already disabled on %s:%u\n",
> - cfg->stream, sd->entity.name, pad);
> - ret = -EALREADY;
This used to return -EALREADY...
> - goto done;
> - }
> - }
> + v4l2_subdev_collect_streams(sd, state, pad, streams_mask,
> + &found_streams, &enabled_streams);
>
> if (found_streams != streams_mask) {
> dev_dbg(dev, "streams 0x%llx not found on %s:%u\n",
> @@ -2325,6 +2336,13 @@ int v4l2_subdev_disable_streams(struct v4l2_subdev *sd, u32 pad,
> goto done;
> }
>
> + if (enabled_streams != streams_mask) {
> + dev_dbg(dev, "streams 0x%llx already disabled on %s:%u\n",
> + streams_mask & ~enabled_streams, sd->entity.name, pad);
> + ret = -EINVAL;
..but now it returns -EINVAL.
Is that intentional?
I prefer EINVAL to be honest, but I was just wondering about this change.
It looks like the next patch removes the last of the EALREADY error returns
as well.
Regards,
Hans
> + goto done;
> + }
> +
> dev_dbg(dev, "disable streams %u:%#llx\n", pad, streams_mask);
>
> /* Call the .disable_streams() operation. */
> @@ -2336,14 +2354,7 @@ int v4l2_subdev_disable_streams(struct v4l2_subdev *sd, u32 pad,
> goto done;
> }
>
> - /* Mark the streams as disabled. */
> - for (i = 0; i < state->stream_configs.num_configs; ++i) {
> - struct v4l2_subdev_stream_config *cfg =
> - &state->stream_configs.configs[i];
> -
> - if (cfg->pad == pad && (streams_mask & BIT_ULL(cfg->stream)))
> - cfg->enabled = false;
> - }
> + v4l2_subdev_set_streams_enabled(sd, state, pad, streams_mask, false);
>
> done:
> if (!v4l2_subdev_is_streaming(sd))
>
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