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

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Message-ID: <28b33851-24eb-428f-b046-b145342fd982@oss.qualcomm.com>
Date: Thu, 28 Aug 2025 14:05:09 +0300
From: Dmitry Baryshkov <dmitry.baryshkov@....qualcomm.com>
To: Xiangxu Yin <xiangxu.yin@....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 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.

> 
> 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
>>>


-- 
With best wishes
Dmitry