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

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Message-ID: <5cdd9f7a-2c28-4ac2-a4da-304d25efbca3@quicinc.com>
Date: Mon, 9 Dec 2024 09:57:33 +0800
From: Xiangxu Yin <quic_xiangxuy@...cinc.com>
To: Abhinav Kumar <quic_abhinavk@...cinc.com>,
        Dmitry Baryshkov
	<dmitry.baryshkov@...aro.org>
CC: Rob Clark <robdclark@...il.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 12/7/2024 4:13 AM, Abhinav Kumar wrote:
> 
> 
> On 12/3/2024 5:58 AM, Dmitry Baryshkov wrote:
>> On Tue, Dec 03, 2024 at 03:41:53PM +0800, Xiangxu Yin wrote:
>>>
>>>
>>> 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.
>>
>> If you drop it, what will be left from the patch itself?
>>
> 
> Yes agree with Dmitry, max_width is really not a DP related terminology.
> 
> This patch should be dropped.
> 
> So there were two issues, overall in this series causing this patch:
> 
> 1) In https://patchwork.freedesktop.org/patch/625822/, instead of using VIG_SDM845_MASK, we should be using VIG_SDM845_MASK_SDMA. Without that even 2k will not work, will leave a comment there.
> 
> 2) 4k will still fail. I dont think we can even support 4k on QCS615 but the modes should be filtered out because there is no 3dmux.
> 
> I have submitted https://patchwork.freedesktop.org/patch/627694/ to address this.
> 
> Xiangxu, please let me know if that works for you.
> 
> Thanks
> 
> Abhinav
Thanks for your patchsets,
After apply patch 625822 & 627694，mode filter works correctly on QCS615 platform with both 4k and 2k monitor.
work>>>>>>>
>>>>>>> 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(+)
>>>>
>>>>
>>>
>>