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

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Message-ID: <86b9a8be-8972-4c19-af0c-da6b3667cbf4@quicinc.com>
Date: Tue, 3 Dec 2024 15:41:53 +0800
From: Xiangxu Yin <quic_xiangxuy@...cinc.com>
To: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
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 12/2/2024 5:32 PM, Dmitry Baryshkov wrote:
> 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.
> 
Ok, Will drop this part in next patch.
>>>>
>>>> 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(+)
> 
>