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Subject: Re: [PATCH v2 1/2] drm/msm: add compatibles for sm8150/sm8250 display
To:     Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Cc:     "open list:DRM DRIVER FOR MSM ADRENO GPU" 
        <linux-arm-msm@vger.kernel.org>, Rob Clark <robdclark@gmail.com>,
        Sean Paul <sean@poorly.run>, David Airlie <airlied@linux.ie>,
        Daniel Vetter <daniel@ffwll.ch>,
        Rob Herring <robh+dt@kernel.org>,
        Jordan Crouse <jcrouse@codeaurora.org>,
        Kalyan Thota <kalyan_t@codeaurora.org>,
        Eric Anholt <eric@anholt.net>,
        Tanmay Shah <tanmay@codeaurora.org>,
        Drew Davenport <ddavenport@chromium.org>,
        Jeykumar Sankaran <jsanka@codeaurora.org>,
        Rajendra Nayak <rnayak@codeaurora.org>,
        tongtiangen <tongtiangen@huawei.com>,
        Qinglang Miao <miaoqinglang@huawei.com>,
        "open list:DRM DRIVER FOR MSM ADRENO GPU" 
        <dri-devel@lists.freedesktop.org>,
        "open list:DRM DRIVER FOR MSM ADRENO GPU" 
        <freedreno@lists.freedesktop.org>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@vger.kernel.org>,
        open list <linux-kernel@vger.kernel.org>
References: <20210215161537.14696-1-jonathan@marek.ca>
 <20210215161537.14696-2-jonathan@marek.ca>
 <CAA8EJpo_Fs8Wj6zjH6BQqm=mG=qcGt3_JMj4nK-vsKCzr8tn1g@mail.gmail.com>
From:   Jonathan Marek <jonathan@marek.ca>
Message-ID: <29231c68-0cc4-9d8a-8cb1-791511780bcd@marek.ca>
Date:   Tue, 16 Feb 2021 13:05:34 -0500
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On 2/16/21 11:54 AM, Dmitry Baryshkov wrote:
> On Mon, 15 Feb 2021 at 19:25, Jonathan Marek <jonathan@marek.ca> wrote:
>>
>> The driver already has support for sm8150/sm8250, but the compatibles were
>> never added.
>>
>> Also inverse the non-mdp4 condition in add_display_components() to avoid
>> having to check every new compatible in the condition.
>>
>> Signed-off-by: Jonathan Marek <jonathan@marek.ca>
>> ---
>>   Documentation/devicetree/bindings/display/msm/dpu.txt | 4 ++--
>>   drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c               | 2 ++
>>   drivers/gpu/drm/msm/msm_drv.c                         | 6 +++---
>>   3 files changed, 7 insertions(+), 5 deletions(-)
>>
>> diff --git a/Documentation/devicetree/bindings/display/msm/dpu.txt b/Documentation/devicetree/bindings/display/msm/dpu.txt
>> index 551ae26f60da..5763f43200a0 100644
>> --- a/Documentation/devicetree/bindings/display/msm/dpu.txt
>> +++ b/Documentation/devicetree/bindings/display/msm/dpu.txt
>> @@ -8,7 +8,7 @@ The DPU display controller is found in SDM845 SoC.
>>
>>   MDSS:
>>   Required properties:
>> -- compatible:  "qcom,sdm845-mdss", "qcom,sc7180-mdss"
>> +- compatible:  "qcom,sdm845-mdss", "qcom,sc7180-mdss", "qcom,sm8150-mdss", "qcom,sm8250-mdss"
>>   - reg: physical base address and length of contoller's registers.
>>   - reg-names: register region names. The following region is required:
>>     * "mdss"
>> @@ -41,7 +41,7 @@ Optional properties:
>>
>>   MDP:
>>   Required properties:
>> -- compatible: "qcom,sdm845-dpu", "qcom,sc7180-dpu"
>> +- compatible: "qcom,sdm845-dpu", "qcom,sc7180-dpu", "qcom,sm8150-dpu", "qcom,sm8250-dpu"
>>   - reg: physical base address and length of controller's registers.
>>   - reg-names : register region names. The following region is required:
>>     * "mdp"
> 
> These two chunks should probably go to the separate patch 'dt-bindings:...'.
> 

In this case I think its better to have this change in the same patch, 
but maybe one of the Robs will disagree.

> Also, could you please pinpoint the reason for adding more
> compatibility strings, while they map to the same internal data?
> I think we might want instead to use some generic name for the dpu
> block, like "qcom,dpu" or "qcom,mdp-dpu" instead of specifying the
> platform name.
> 

sdm845 and sc7180 aren't using generic compatibles, this is just being 
consistent with that.

> 
>> diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c
>> index 5a8e3e1fc48c..fff12a4c8bfc 100644
>> --- a/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c
>> +++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c
>> @@ -1219,6 +1219,8 @@ static const struct dev_pm_ops dpu_pm_ops = {
>>   static const struct of_device_id dpu_dt_match[] = {
>>          { .compatible = "qcom,sdm845-dpu", },
>>          { .compatible = "qcom,sc7180-dpu", },
>> +       { .compatible = "qcom,sm8150-dpu", },
>> +       { .compatible = "qcom,sm8250-dpu", },
>>          {}
>>   };
>>   MODULE_DEVICE_TABLE(of, dpu_dt_match);
>> diff --git a/drivers/gpu/drm/msm/msm_drv.c b/drivers/gpu/drm/msm/msm_drv.c
>> index 94525ac76d4e..928f13d4bfbc 100644
>> --- a/drivers/gpu/drm/msm/msm_drv.c
>> +++ b/drivers/gpu/drm/msm/msm_drv.c
>> @@ -1185,9 +1185,7 @@ static int add_display_components(struct device *dev,
>>           * Populate the children devices, find the MDP5/DPU node, and then add
>>           * the interfaces to our components list.
>>           */
>> -       if (of_device_is_compatible(dev->of_node, "qcom,mdss") ||
>> -           of_device_is_compatible(dev->of_node, "qcom,sdm845-mdss") ||
>> -           of_device_is_compatible(dev->of_node, "qcom,sc7180-mdss")) {
>> +       if (!of_device_is_compatible(dev->of_node, "qcom,mdp4")) {
>>                  ret = of_platform_populate(dev->of_node, NULL, NULL, dev);
>>                  if (ret) {
>>                          DRM_DEV_ERROR(dev, "failed to populate children devices\n");
>> @@ -1320,6 +1318,8 @@ static const struct of_device_id dt_match[] = {
>>          { .compatible = "qcom,mdss", .data = (void *)KMS_MDP5 },
>>          { .compatible = "qcom,sdm845-mdss", .data = (void *)KMS_DPU },
>>          { .compatible = "qcom,sc7180-mdss", .data = (void *)KMS_DPU },
>> +       { .compatible = "qcom,sm8150-mdss", .data = (void *)KMS_DPU },
>> +       { .compatible = "qcom,sm8250-mdss", .data = (void *)KMS_DPU },
>>          {}
>>   };
>>   MODULE_DEVICE_TABLE(of, dt_match);
>> --
>> 2.26.1
>>
> 
>