Messages in this thread | | | Date | Wed, 24 Apr 2024 16:08:58 +0300 | Subject | Re: [PATCH v5 08/10] media: subdev: Refactor v4l2_subdev_enable/disable_streams() | From | Tomi Valkeinen <> |
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On 24/04/2024 11:41, Hans Verkuil wrote: > 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@ideasonboard.com> >> Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ideasonboard.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?
No. I think it was a copy-paste thing.
> 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.
Good catch. We document that the enable_streams() returns EALREADY if a stream is already enabled, so lets stick to that. I'll update the patches.
Tomi
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