linux-kernel - Re: [PATCH 1/2] media: iris: Add support for QC08C format for decoder

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Message-ID: <blrugv2y4hvgcswbnyk3s6cpv3pfuyyxduoulxqnf24qnykosy@ra265lwayjix>
Date: Mon, 6 Oct 2025 13:18:21 +0300
From: Dmitry Baryshkov <dmitry.baryshkov@....qualcomm.com>
To: Dikshita Agarwal <dikshita.agarwal@....qualcomm.com>
Cc: Bryan O'Donoghue <bod@...nel.org>,
        Neil Armstrong <neil.armstrong@...aro.org>,
        Vikash Garodia <vikash.garodia@....qualcomm.com>,
        Abhinav Kumar <abhinav.kumar@...ux.dev>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        linux-media@...r.kernel.org, linux-arm-msm@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] media: iris: Add support for QC08C format for decoder

On Mon, Oct 06, 2025 at 11:51:19AM +0530, Dikshita Agarwal wrote:
> 
> 
> On 10/1/2025 8:34 PM, Bryan O'Donoghue wrote:
> > On 01/10/2025 09:36, Neil Armstrong wrote:
> >> On 9/24/25 15:28, Bryan O'Donoghue wrote:
> >>> On 19/09/2025 16:47, Dikshita Agarwal wrote:
> >>>> Introduce handling for the QC08C format in the decoder.
> >>>> Update format checks and configuration to enable decoding of QC08C
> >>>> streams.
> >>>
> >>> Since QC08C is a Qualcomm specific pixel format, you should detail in
> >>> your commit log exactly what the packing/ordering of pixels is.
> >>>
> >>> In other words tell the reader more about QC08C.
> >>
> >> This has been upstreamed 3y ago for venus, which is the same as iris:
> >> https://lore.kernel.org/all/20220117155559.234026-1-stanimir.varbanov@linaro.org/
> >>
> >> No need to re-explain it for iris, the format is the same.
> >>
> >> Neil
> > Yeah no, at a minimum the explanation of NV12 + UBWC should appear in the
> > commit log for this format.
> 
> Please see [1] in case it was missed

Just mentioning that QC08C is NV12 with UBWC compression wouldn't harm
and it would make everybody's life easier.

> 
> [1]:
> https://lore.kernel.org/linux-media/10bb819d-105b-5471-b3a6-774fce134eb6@oss.qualcomm.com/
> 
> Thanks,
> Dikshita
> > 
> > thx
> > ---
> > bod

-- 
With best wishes
Dmitry