media: amphion: defer setting last_buffer_dequeued until resolution changes are processed

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[ Upstream commit afba6e2080 ]

Don't set last_buffer_dequeued during dynamic resolution change,
otherwise it may be cleared in handling resolution change,
as streamoff may be called in dynamic resolution change.

Normally, this does not happen.
But we encounter a special testcase,
User issue V4L2_DEC_CMD_STOP after enqueue one buffer
that only contains codec config header, but not any frame data.
So VPU report the parsed resolution, then report the eos event.

So driver should notify user to handle resolution change first,
after it's handled, set the last_buffer_dequeued.
then the user can exit decoding normally.

Otherwise the user may be stalled.

Fixes: 6de8d628df ("media: amphion: add v4l2 m2m vpu decoder stateful driver")
Signed-off-by: Ming Qian <ming.qian@nxp.com>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>

...

This commit is contained in:

Ming Qian 2022-06-28 06:21:12 +01:00 • committed by Greg Kroah-Hartman

parent eff68a9e24

commit 34e14ee533

2 changed files with 23 additions and 15 deletions

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36

drivers/media/platform/amphion/vdec.c

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2

drivers/media/platform/amphion/vpu_v4l2.c

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