linux-kernel - Re: [PATCH] media: v4l2-ctrls: set AV1 sequence flags for testing

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Message-ID: <6658f47a-a6f4-4b9e-9711-69a0afb31cf5@kernel.org>
Date: Tue, 28 Oct 2025 11:02:43 +0100
From: Hans Verkuil <hverkuil+cisco@...nel.org>
To: Nicolas Dufresne <nicolas@...fresne.ca>,
 Pavan Bobba <opensource206@...il.com>, mchehab@...nel.org,
 hverkuil@...nel.org, ribalda@...omium.org,
 laurent.pinchart@...asonboard.com, hansg@...nel.org, yunkec@...gle.com,
 sakari.ailus@...ux.intel.com, james.cowgill@...ize.com
Cc: linux-media@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] media: v4l2-ctrls: set AV1 sequence flags for testing

On 10/28/25 10:47, Nicolas Dufresne wrote:
> Hi,
> 
> Le mardi 28 octobre 2025 à 11:56 +0530, Pavan Bobba a écrit :
>> Initialize additional AV1 sequence parameters in std_init_compound()
>> to make the default AV1 sequence control compatible with compliance
>> and userspace testing tools.
>>
>> Specifically, set:
>>  - enable both SUBSAMPLING_X and SUBSAMPLING_Y flags
>>
>> These defaults help ensure that V4L2_CID_AV1_SEQUENCE behaves
>> consistently during validation and v4l2-compliance tests.
>>
>> Signed-off-by: Pavan Bobba <opensource206@...il.com>
>> ---
>>  drivers/media/v4l2-core/v4l2-ctrls-core.c | 6 ++++++
>>  1 file changed, 6 insertions(+)
>>
>> diff --git a/drivers/media/v4l2-core/v4l2-ctrls-core.c b/drivers/media/v4l2-core/v4l2-ctrls-core.c
>> index fa03341588e4..8809912797d2 100644
>> --- a/drivers/media/v4l2-core/v4l2-ctrls-core.c
>> +++ b/drivers/media/v4l2-core/v4l2-ctrls-core.c
>> @@ -160,7 +160,13 @@ static void std_init_compound(const struct v4l2_ctrl *ctrl, u32 idx,
>>  		break;
>>  	case V4L2_CTRL_TYPE_AV1_SEQUENCE:
>>  		p_av1_sequence = p;
>> +		/*
>> +		 *setting below parameters to make AV1 sequence compatible
>> +		 *for the testing
>> +		 */
>>  		p_av1_sequence->bit_depth = 8;
>> +		p_av1_sequence->flags |= V4L2_AV1_SEQUENCE_FLAG_SUBSAMPLING_X |
>> +			V4L2_AV1_SEQUENCE_FLAG_SUBSAMPLING_Y;
> 
> There is a bit of a lack of clarity upon why we do this. I would comment on
> that.
> 
> /**
>  * The initial profile is 0 which only allows YUV 420 subsampled data. Set the  
>  * subsampling flags accordingly.
>  */
> 
> With the correction:
> Reviewed-by: Nicolas Dufresne <nicolas.dufresne@...labora.com>

I'll add that and fast-track this patch so the virtme CI regression tests work
again.

Thank you!

	Hans

> 
> cheers,
> Nicolas
> 
>>  		break;
>>  	case V4L2_CTRL_TYPE_FWHT_PARAMS:
>>  		p_fwht_params = p;