linux-kernel - Re: [PATCH v7 6/6] drm/msm/dp: Add DisplayPort controller for QCS8300

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Message-ID: <20e7790e-6a30-4301-aa50-db180ceeb7a8@oss.qualcomm.com>
Date: Tue, 19 Aug 2025 17:22:19 +0800
From: Yongxing Mou <yongxing.mou@....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>,
        Neil Armstrong <neil.armstrong@...aro.org>,
        Kuogee Hsieh <quic_khsieh@...cinc.com>,
        Bjorn Andersson <andersson@...nel.org>,
        Konrad Dybcio <konradybcio@...nel.org>, linux-arm-msm@...r.kernel.org,
        dri-devel@...ts.freedesktop.org, freedreno@...ts.freedesktop.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v7 6/6] drm/msm/dp: Add DisplayPort controller for QCS8300



On 2025/8/19 15:59, Dmitry Baryshkov wrote:
> On Tue, Aug 19, 2025 at 11:33:33AM +0800, Yongxing Mou wrote:
>> The Qualcomm QCS8300 platform comes with one DisplayPort controller
>> with same base offset as SM8650. But it requires new compatible string
>> because QCS8300 controller supports 4 MST streams. 4 MST streams will
>> be enabled as part of MST feature support. Currently, using SM8650 as
>> fallback to enable SST on QCS8300.
> 
> Hmm, no, you are not using SM8650 as a fallback. You are using the data
> structure for SM8650 for QCS8300. That's a different thing. It would
> have been using SM8650 as fallback, if you had declared device with two
> compatibles, qcom,qcs8300-dp and qcom,sm8650-dp, and then relied on the
> second entry (only) to provide a match and data.
> 
> Exactly the same comment applies to the UBWC patch.
> 
Got it, thanks, will correct it in next version soon..
>>
>> Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@....qualcomm.com>
>> Signed-off-by: Yongxing Mou <yongxing.mou@....qualcomm.com>
>> ---
>>   drivers/gpu/drm/msm/dp/dp_display.c | 1 +
>>   1 file changed, 1 insertion(+)
>>
>> diff --git a/drivers/gpu/drm/msm/dp/dp_display.c b/drivers/gpu/drm/msm/dp/dp_display.c
>> index d87d47cc7ec3eb757ac192c411000bc50b824c59..bb4660585849d1a67921a28e7e12422e0c327ab2 100644
>> --- a/drivers/gpu/drm/msm/dp/dp_display.c
>> +++ b/drivers/gpu/drm/msm/dp/dp_display.c
>> @@ -187,6 +187,7 @@ static const struct msm_dp_desc msm_dp_desc_x1e80100[] = {
>>   };
>>   
>>   static const struct of_device_id msm_dp_dt_match[] = {
>> +	{ .compatible = "qcom,qcs8300-dp", .data = &msm_dp_desc_sm8650 },
>>   	{ .compatible = "qcom,sa8775p-dp", .data = &msm_dp_desc_sa8775p },
>>   	{ .compatible = "qcom,sc7180-dp", .data = &msm_dp_desc_sc7180 },
>>   	{ .compatible = "qcom,sc7280-dp", .data = &msm_dp_desc_sc7280 },
>>
>> -- 
>> 2.34.1
>>
>