Re: [PATCH v2 1/2] drm/msm: add compatibles for sm8150/sm8250 display

[Jonathan Marek]

On 2/16/21 11:54 AM, Dmitry Baryshkov wrote:
> On Mon, 15 Feb 2021 at 19:25, Jonathan Marek <jonathan@xxxxxxxx> 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@xxxxxxxx>
> > ---
> >   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