linux-kernel - [PATCH v4 1/3] media: docs: dev-decoder: Trigger dynamic source change for colorspace

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Message-ID: <20251217030227.1546-2-ming.qian@oss.nxp.com>
Date: Wed, 17 Dec 2025 11:02:21 +0800
From: ming.qian@....nxp.com
To: linux-media@...r.kernel.org
Cc: mchehab@...nel.org,
	hverkuil-cisco@...all.nl,
	nicolas@...fresne.ca,
	sebastian.fricke@...labora.com,
	shawnguo@...nel.org,
	s.hauer@...gutronix.de,
	kernel@...gutronix.de,
	festevam@...il.com,
	linux-imx@....com,
	Frank.li@....com,
	xiahong.bao@....com,
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	linux-kernel@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org
Subject: [PATCH v4 1/3] media: docs: dev-decoder: 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.

So add colorspace as a trigger parameter for dynamic resolution change.

Signed-off-by: Ming Qian <ming.qian@....nxp.com>
---
 Documentation/userspace-api/media/v4l/dev-decoder.rst | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/Documentation/userspace-api/media/v4l/dev-decoder.rst b/Documentation/userspace-api/media/v4l/dev-decoder.rst
index eb662ced0ab4..2beb6ba1b3c2 100644
--- a/Documentation/userspace-api/media/v4l/dev-decoder.rst
+++ b/Documentation/userspace-api/media/v4l/dev-decoder.rst
@@ -933,7 +933,10 @@ reflected by corresponding queries):
 
 * the minimum number of buffers needed for decoding,
 
-* bit-depth of the bitstream has been changed.
+* bit-depth of the bitstream has been changed,
+
+* colorspace of the bitstream has been changed, but it doesn't require
+  buffer reallocation.
 
 Whenever that happens, the decoder must proceed as follows:
 
-- 
2.52.0