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

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Message-ID: <e7dafea3-2dc6-4737-b257-1dac6d7ce65f@quicinc.com>
Date: Mon, 9 Dec 2024 12:18:42 -0800
From: Abhinav Kumar <quic_abhinavk@...cinc.com>
To: Xiangxu Yin <quic_xiangxuy@...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 12/8/2024 5:57 PM, Xiangxu Yin wrote:
> 
> 
> 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>>>>>>>

Thanks. If you can give your Tested-by on 
https://patchwork.freedesktop.org/patch/627967/, that would be great.

>>>>>>>> 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(+)
>>>>>
>>>>>
>>>>
>>>
>