linux-kernel - Re: [PATCH v3 01/14] dt-bindings: display/msm: dp-controller: Add sm6150

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Message-ID: <75f8789d-9d97-49d9-97b0-908a5692c325@oss.qualcomm.com>
Date: Mon, 1 Sep 2025 20:32:54 +0800
From: Xiangxu Yin <xiangxu.yin@....qualcomm.com>
To: Dmitry Baryshkov <dmitry.baryshkov@....qualcomm.com>
Cc: Rob Clark <robin.clark@....qualcomm.com>,
        Dmitry Baryshkov <lumag@...nel.org>,
        Abhinav Kumar
 <abhinav.kumar@...ux.dev>,
        Jessica Zhang <jessica.zhang@....qualcomm.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>,
        Philipp Zabel <p.zabel@...gutronix.de>, 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, fange.zhang@....qualcomm.com,
        yongxing.mou@....qualcomm.com, tingwei.zhang@....qualcomm.com,
        Bjorn Andersson <andersson@...nel.org>,
        Konrad Dybcio <konradybcio@...nel.org>, quic_lliu6@...cinc.com
Subject: Re: [PATCH v3 01/14] dt-bindings: display/msm: dp-controller: Add
 sm6150


On 8/28/2025 7:05 PM, Dmitry Baryshkov wrote:
> On 28/08/2025 07:51, Xiangxu Yin wrote:
>>
>> On 8/20/2025 6:18 PM, Dmitry Baryshkov wrote:
>>> On Wed, Aug 20, 2025 at 05:34:43PM +0800, Xiangxu Yin wrote:
>>>> Add DisplayPort controller for Qualcomm SM6150 SoC.
>>>> While SM6150 currently shares the same configuration as SC7180,
>>>> its hardware capabilities differ. Explicitly listing it ensures clarity
>>>> and avoids potential issues if SC7180 support evolves in the future.
>>> I assume, it has no MST support. Am I right?
>>
>>
>>  From sm6150 ipcat, I found MST-related registers and pixel1 clk definition.
>
> Then please describe MST as the main difference between SM6150 and SC7180 (which doesn't have MST).
>
> Also this needs to be rebased on top of the MST bindings. I've picked up the latest posted revision, but basing on the on-list discussion I might need to drop it and post another iteration. 
>

Would you prefer I keep the current patch and update the description of the
MST capability difference with SC7180 in the commit message, or rebase on
your series and update the dt-binding accordingly?
https://lore.kernel.org/all/20250829-dp_mst_bindings-v7-0-2b268a43917b@oss.qualcomm.com

Since MST support is not yet mainlined in the DP driver, even if I rebase
now, the final implementation may require redefining msm_dp_desc for
SM6150 in both the dt-binding and the driver once MST lands.


>>
>> According to the hardware spec, MST is supported, but due to limitations in clock and pipe resources,
>>
>> the maximum concurrency capability is restricted to 1920x1200@60 + 1280x720@60.
>>
>>
>>>> Signed-off-by: Xiangxu Yin <xiangxu.yin@....qualcomm.com>
>>>> ---
>>>>   Documentation/devicetree/bindings/display/msm/dp-controller.yaml | 1 +
>>>>   1 file changed, 1 insertion(+)
>>>>
>>>> diff --git a/Documentation/devicetree/bindings/display/msm/dp-controller.yaml b/Documentation/devicetree/bindings/display/msm/dp-controller.yaml
>>>> index 9923b065323bbab99de5079b674a0317f3074373..996d0132e084d401db85014a1a4e445d00d62ed8 100644
>>>> --- a/Documentation/devicetree/bindings/display/msm/dp-controller.yaml
>>>> +++ b/Documentation/devicetree/bindings/display/msm/dp-controller.yaml
>>>> @@ -27,6 +27,7 @@ properties:
>>>>             - qcom,sc8280xp-dp
>>>>             - qcom,sc8280xp-edp
>>>>             - qcom,sdm845-dp
>>>> +          - qcom,sm6150-dp
>>>>             - qcom,sm8350-dp
>>>>             - qcom,sm8650-dp
>>>>         - items:
>>>>
>>>> -- 
>>>> 2.34.1
>>>>
>
>