linux-kernel - Re: [PATCH 1/2] drm/msm/dpu: Add MSM8996 support

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Message-ID: <CAA8EJppHXUE=zhw=h7qM1iP3oLK6K9=Rqte5hKHtRGmT-5SWhA@mail.gmail.com>
Date: Fri, 27 Sep 2024 18:07:30 +0200
From: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
To: barnabas.czeman@...nlining.org
Cc: Icenowy Zheng <uwu@...nowy.me>, Rob Clark <robdclark@...il.com>, 
	Abhinav Kumar <quic_abhinavk@...cinc.com>, Sean Paul <sean@...rly.run>, 
	Marijn Suijten <marijn.suijten@...ainline.org>, David Airlie <airlied@...il.com>, 
	Daniel Vetter <daniel@...ll.ch>, linux-kernel@...r.kernel.org, 
	linux-arm-msm@...r.kernel.org, dri-devel@...ts.freedesktop.org, 
	freedreno@...ts.freedesktop.org, Konrad Dybcio <konrad.dybcio@...aro.org>, 
	Konrad Dybcio <konrad.dybcio@...ainline.org>
Subject: Re: [PATCH 1/2] drm/msm/dpu: Add MSM8996 support

On Fri, 27 Sept 2024 at 17:44, <barnabas.czeman@...nlining.org> wrote:
>
> On 2024-08-18 09:16, Icenowy Zheng wrote:
> > 在 2024-06-28星期五的 16:39 +0200，Barnabás Czémán写道：
> >> From: Konrad Dybcio <konrad.dybcio@...aro.org>
> >>
> >> Add support for MSM8996, which - fun fact - was the SoC that this
> >> driver
> >> (or rather SDE, its downstream origin) was meant for and first tested
> >> on.
> >>
> >> It has some hardware that differs from the modern SoCs, so not a lot
> >> of
> >> current structs could have been reused. It's also seemingly the only
> >> SoC
> >> supported by DPU that uses RGB pipes.
> >>
> >> Note, by default this platform is still handled by the MDP5 driver
> >> unless the `msm.prefer_mdp5=false' parameter is provided.
> >
> > For curiosity, will this driver makes DSC possible on MSM8996?
> As far as i know yes, but if i know correctly there are some DSC
> support also in MDP5.

No, MDP5 doesn't support DSC. mdp5_cfg.c defines corresponding
capabilities, but there is no actual support.

> > I think the Google Pixel device uses a panel that needs DSC, which
> > makes mainlining it currently impossible.

I hope we can look at the DSC support for those platforms at some
point. No particular dates and/or plans yet.

-- 
With best wishes
Dmitry