linux-kernel - Re: [PATCH 1/7] venus : Add default values for the control V4L2_CID_COLORIMETRY_HDR10_MASTERING

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Date:   Mon, 25 Jul 2022 12:01:19 +0300
From:   Stanimir Varbanov <stanimir.varbanov@...aro.org>
To:     Nicolas Dufresne <nicolas@...fresne.ca>,
        Viswanath Boma <quic_vboma@...cinc.com>,
        Stanimir Varbanov <stanimir.varbanov@...aro.org>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        linux-media@...r.kernel.org, linux-arm-msm@...r.kernel.org,
        linux-kernel@...r.kernel.org, Hans Verkuil <hverkuil@...all.nl>
Subject: Re: [PATCH 1/7] venus : Add default values for the control
 V4L2_CID_COLORIMETRY_HDR10_MASTERING_DISPLAY



On 7/12/22 16:34, Nicolas Dufresne wrote:
> Le mardi 12 juillet 2022 à 17:53 +0530, Viswanath Boma a écrit :
>> From: Stanimir Varbanov <stanimir.varbanov@...aro.org>
>>
>>  V4l2 encoder compliance expecting default values of colormetry for the control.
> 
> nit: colormetry -> colorimetry
> 
>>
>> Change-Id: I1db0d4940b54e033d646ce39d60dc488afba8d58
>> Signed-off-by: Viswanath Boma <quic_vboma@...cinc.com>
>> ---
>>  drivers/media/platform/qcom/venus/venc_ctrls.c | 4 +++-
>>  1 file changed, 3 insertions(+), 1 deletion(-)
>>
>> diff --git a/drivers/media/platform/qcom/venus/venc_ctrls.c b/drivers/media/platform/qcom/venus/venc_ctrls.c
>> index ea5805e71c143..37ba7d97f99b2 100644
>> --- a/drivers/media/platform/qcom/venus/venc_ctrls.c
>> +++ b/drivers/media/platform/qcom/venus/venc_ctrls.c
>> @@ -352,6 +352,8 @@ static const struct v4l2_ctrl_ops venc_ctrl_ops = {
>>  int venc_ctrl_init(struct venus_inst *inst)
>>  {
>>  	int ret;
>> +	struct v4l2_ctrl_hdr10_mastering_display p_hdr10_mastering = { {34000, 13250, 7500 },
>> +	{ 16000, 34500, 3000 }, 15635,	16450, 10000000, 500 };
> 
> What is the origin of these values ? Should this be done in the control
> framework instead ?

We needed some safe default values to satisfy v4l2 control. I took the
values from here [1].

I'm not sure do we need them in v4l2 control core (most probably it is a
good to have it), Hans ?

> 
>>  
>>  	ret = v4l2_ctrl_handler_init(&inst->ctrl_handler, 58);
>>  	if (ret)
>> @@ -580,7 +582,7 @@ int venc_ctrl_init(struct venus_inst *inst)
>>  
>>  	v4l2_ctrl_new_std_compound(&inst->ctrl_handler, &venc_ctrl_ops,
>>  				   V4L2_CID_COLORIMETRY_HDR10_MASTERING_DISPLAY,
>> -				   v4l2_ctrl_ptr_create(NULL));
>> +				   v4l2_ctrl_ptr_create((void *)&p_hdr10_mastering));
>>  
>>  	v4l2_ctrl_new_std(&inst->ctrl_handler, &venc_ctrl_ops,
>>  			  V4L2_CID_MPEG_VIDEO_INTRA_REFRESH_PERIOD, 0,
> 

-- 
regards,
Stan

[1] https://www.elecard.com/page/article_hdr