linux-kernel - [PATCH v4 0/3] Trigger dynamic source change for colorspace

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Message-ID: <20251217030227.1546-1-ming.qian@oss.nxp.com>
Date: Wed, 17 Dec 2025 11:02:20 +0800
From: ming.qian@....nxp.com
To: linux-media@...r.kernel.org
Cc: mchehab@...nel.org,
	hverkuil-cisco@...all.nl,
	nicolas@...fresne.ca,
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	linux-arm-kernel@...ts.infradead.org
Subject: [PATCH v4 0/3] Trigger dynamic source change for colorspace

From: Ming Qian <ming.qian@....nxp.com>

If colorspace changes, the client needs to renegotiate the pipeline,
otherwise the decoded frame may not be displayed correctly.

A change in colorspace triggers a source change, allowing the client to
detect the specific reason and decide whether request buffer
reallocation.

Change logs:
v4
- Drop V4L2_EVENT_SRC_CH_COLORSPACE, to avoid backward compatibility
  issues.
- Add cover-leter

v3
- Improve the description according to comments

v2
- Add V4L2_EVENT_SRC_CH_COLORSPACE for colorspace source change event

Ming Qian (3):
  media: docs: dev-decoder: Trigger dynamic source change for colorspace
  media: amphion: Clear last_buffer_dequeued flag for DEC_CMD_START
  media: amphion: Trigger source change if colorspace changed

 .../userspace-api/media/v4l/dev-decoder.rst   |  5 +-
 drivers/media/platform/amphion/vdec.c         | 62 ++++++++++++-------
 drivers/media/platform/amphion/vpu_v4l2.c     |  1 -
 3 files changed, 45 insertions(+), 23 deletions(-)


base-commit: f7231cff1f3ff8259bef02dc4999bc132abf29cf
prerequisite-patch-id: 0000000000000000000000000000000000000000
prerequisite-patch-id: f33b49b7c9c245b32701d1a6e8250da297ccc39b
-- 
2.52.0