linux-kernel - Re: [PATCH 4/4] venus: return P010 as preferred format for 10 bit decode

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Date:   Fri, 5 May 2023 14:03:52 +0300
From:   Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
To:     Dikshita Agarwal <quic_dikshita@...cinc.com>,
        Konrad Dybcio <konrad.dybcio@...aro.org>,
        linux-media@...r.kernel.org, stanimir.k.varbanov@...il.com,
        quic_vgarodia@...cinc.com, agross@...nel.org, andersson@...nel.org,
        mchehab@...nel.org
Cc:     linux-kernel@...r.kernel.org, linux-arm-msm@...r.kernel.org
Subject: Re: [PATCH 4/4] venus: return P010 as preferred format for 10 bit
 decode

On 05/05/2023 12:03, Dikshita Agarwal wrote:
> 
> On 5/4/2023 10:50 PM, Konrad Dybcio wrote:
>>
>> On 4.05.2023 12:36, Dikshita Agarwal wrote:
>>> If bit depth is detected as 10 bit by firmware, return
>>> P010 as preferred decoder format to the client.
>>>
>>> Signed-off-by: Dikshita Agarwal <quic_dikshita@...cinc.com>
>>> ---
>>>   drivers/media/platform/qcom/venus/vdec.c | 7 ++++++-
>>>   1 file changed, 6 insertions(+), 1 deletion(-)
>>>
>>> diff --git a/drivers/media/platform/qcom/venus/vdec.c 
>>> b/drivers/media/platform/qcom/venus/vdec.c
>>> index 69f7f6e..ed11dc2 100644
>>> --- a/drivers/media/platform/qcom/venus/vdec.c
>>> +++ b/drivers/media/platform/qcom/venus/vdec.c
>>> @@ -1468,8 +1468,13 @@ static void vdec_event_change(struct 
>>> venus_inst *inst,
>>>       inst->out_width = ev_data->width;
>>>       inst->out_height = ev_data->height;
>>> -    if (inst->bit_depth != ev_data->bit_depth)
>>> +    if (inst->bit_depth != ev_data->bit_depth) {
>>>           inst->bit_depth = ev_data->bit_depth;
>>> +        if (inst->bit_depth == VIDC_BITDEPTH_10)
>>> +            inst->fmt_cap = &vdec_formats[3];
>>> +        else
>>> +            inst->fmt_cap = &vdec_formats[0];
>> This doesn't scale and is very error-prone, please enumerate the
>> entries and assign it using the enumerator, like:
>>
>> enum {
>>     VDEC_FORMAT_FOO,
>>     ...
>> };
>>
>> ... vdec_formats[] = {
>>     [VDEC_FORMAT_FOO] = { foo, bar, baz }
>> }
>>
>> Konrad
> 
> I agree, this can be improved but I would prefer making that change as 
> separate patch.

Good!

> 
> As this is not only related to HDR 10 decoding, there are other places 
> in the code which will require similar change.

Please fix them first. Adding more cruft is not a good way to go.

> 
> Thanks,
> 
> Dikshita
> 
>>> +    }
>>>       if (inst->pic_struct != ev_data->pic_struct)
>>>           inst->pic_struct = ev_data->pic_struct;

-- 
With best wishes
Dmitry