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

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Message-ID: <b6ae2f157fb6fd0b80602f363b99dab1dc0b1cc6.camel@ndufresne.ca>
Date: Wed, 24 Dec 2025 14:18:02 -0500
From: Nicolas Dufresne <nicolas@...fresne.ca>
To: ming.qian@....nxp.com, linux-media@...r.kernel.org
Cc: mchehab@...nel.org, hverkuil-cisco@...all.nl, 
	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,
 eagle.zhou@....com, imx@...ts.linux.dev, 	linux-kernel@...r.kernel.org,
 linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH v4 1/3] media: docs: dev-decoder: Trigger dynamic source
 change for colorspace

Le mercredi 17 décembre 2025 à 11:02 +0800, ming.qian@....nxp.com a écrit :
> 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>

Reviewed-by: Nicolas Dufresne <nicolas.dufresne@...labora.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:
>  

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