linux-kernel - Re: [PATCH] media: verisilicon: AV1: Be more fexible on postproc capabilities

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Message-ID: <ebbe249f-bce6-4e81-969f-c63ab4b063f3@collabora.com>
Date: Fri, 5 Apr 2024 10:17:49 +0200
From: Benjamin Gaignard <benjamin.gaignard@...labora.com>
To: Nicolas Dufresne <nicolas@...fresne.ca>, ezequiel@...guardiasur.com.ar,
 p.zabel@...gutronix.de, mchehab@...nel.org, heiko@...ech.de
Cc: linux-media@...r.kernel.org, linux-rockchip@...ts.infradead.org,
 linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
 kernel@...labora.com
Subject: Re: [PATCH] media: verisilicon: AV1: Be more fexible on postproc
 capabilities


Le 04/04/2024 à 19:59, Nicolas Dufresne a écrit :
> Hi,
>
> Le jeudi 28 mars 2024 à 10:34 +0100, Benjamin Gaignard a écrit :
>> RK3588 post-processor block is able to convert 10 bits streams
>> into 8 bits pixels format.
> Does it come with any HDR to SDR capabilities ? cause stripping off 2 bits means
> that tone mapping will cause a lot of banding as it won't have the expected
> precision. I'm simply trying to make up the big portrait so we don't just offer
> yet another foot gun. But perhaps its fine to offer this, its just that we don't
> have a mechanism to report which pixel format in the selection will cause data
> lost.

No it just to enable post-processor capabilities like we have already for G2/HEVC.
Since it is a post-processor pixel format it will be enumerated after V4L2_PIX_FMT_NV15_4L4
so it will update to userland to decide to use it or not.

Benjamin

>
> Nicolas
>
>> Signed-off-by: Benjamin Gaignard <benjamin.gaignard@...labora.com>
>> Fixes: 003afda97c65 ("media: verisilicon: Enable AV1 decoder on rk3588")
>> ---
>>   drivers/media/platform/verisilicon/rockchip_vpu_hw.c | 1 -
>>   1 file changed, 1 deletion(-)
>>
>> diff --git a/drivers/media/platform/verisilicon/rockchip_vpu_hw.c b/drivers/media/platform/verisilicon/rockchip_vpu_hw.c
>> index f97527670783..964122e7c355 100644
>> --- a/drivers/media/platform/verisilicon/rockchip_vpu_hw.c
>> +++ b/drivers/media/platform/verisilicon/rockchip_vpu_hw.c
>> @@ -82,7 +82,6 @@ static const struct hantro_fmt rockchip_vpu981_postproc_fmts[] = {
>>   	{
>>   		.fourcc = V4L2_PIX_FMT_NV12,
>>   		.codec_mode = HANTRO_MODE_NONE,
>> -		.match_depth = true,
>>   		.postprocessed = true,
>>   		.frmsize = {
>>   			.min_width = ROCKCHIP_VPU981_MIN_SIZE,
>