linux-kernel - Re: [PATCH 6/8] drm/msm/dp: Add maximum width limitation for modes

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Message-ID: <CAA8EJpo-1o9i4JhZgdbvRxvoYQE2v18Lz_8dVg=Za7a_pk5EDA@mail.gmail.com>
Date: Mon, 2 Dec 2024 11:32:45 +0200
From: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
To: Xiangxu Yin <quic_xiangxuy@...cinc.com>
Cc: Rob Clark <robdclark@...il.com>, Abhinav Kumar <quic_abhinavk@...cinc.com>, 
	Sean Paul <sean@...rly.run>, Marijn Suijten <marijn.suijten@...ainline.org>, 
	Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>, Maxime Ripard <mripard@...nel.org>, 
	Thomas Zimmermann <tzimmermann@...e.de>, David Airlie <airlied@...il.com>, Simona Vetter <simona@...ll.ch>, 
	Rob Herring <robh@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>, Conor Dooley <conor+dt@...nel.org>, 
	Kuogee Hsieh <quic_khsieh@...cinc.com>, Vinod Koul <vkoul@...nel.org>, 
	Kishon Vijay Abraham I <kishon@...nel.org>, Linus Walleij <linus.walleij@...aro.org>, 
	Bartosz Golaszewski <brgl@...ev.pl>, quic_lliu6@...cinc.com, quic_fangez@...cinc.com, 
	linux-arm-msm@...r.kernel.org, dri-devel@...ts.freedesktop.org, 
	freedreno@...ts.freedesktop.org, devicetree@...r.kernel.org, 
	linux-kernel@...r.kernel.org, linux-phy@...ts.infradead.org, 
	linux-gpio@...r.kernel.org
Subject: Re: [PATCH 6/8] drm/msm/dp: Add maximum width limitation for modes

On Mon, 2 Dec 2024 at 11:05, Xiangxu Yin <quic_xiangxuy@...cinc.com> wrote:
>
>
>
> On 11/29/2024 9:52 PM, Dmitry Baryshkov wrote:
> > On Fri, 29 Nov 2024 at 09:59, Xiangxu Yin <quic_xiangxuy@...cinc.com> wrote:
> >>
> >> Introduce a maximum width constraint for modes during validation. This
> >> ensures that the modes are filtered based on hardware capabilities,
> >> specifically addressing the line buffer limitations of individual pipes.
> >
> > This doesn't describe, why this is necessary. What does "buffer
> > limitations of individual pipes" mean?
> > If the platforms have hw capabilities like being unable to support 8k
> > or 10k, it should go to platform data
> >
> It's SSPP line buffer limitation for this platform and only support to 2160 mode width.
> Then, shall I add max_width config to struct msm_dp_desc in next patch? for other platform will set defualt value to ‘DP_MAX_WIDTH 7680'

SSPP line buffer limitations are to be handled in the DPU driver. The
DP driver shouldn't care about those.

> >>
> >> Signed-off-by: Xiangxu Yin <quic_xiangxuy@...cinc.com>
> >> ---
> >>  drivers/gpu/drm/msm/dp/dp_display.c |  3 +++
> >>  drivers/gpu/drm/msm/dp/dp_display.h |  1 +
> >>  drivers/gpu/drm/msm/dp/dp_panel.c   | 13 +++++++++++++
> >>  drivers/gpu/drm/msm/dp/dp_panel.h   |  1 +
> >>  4 files changed, 18 insertions(+)


-- 
With best wishes
Dmitry