Quoting Dmitry Baryshkov (2022-03-23 02:25:38)
> diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c
> index 38627ccf3068..ab8a35e09bc9 100644
> --- a/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c
> +++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c
> @@ -381,8 +381,8 @@ static int dpu_kms_parse_data_bus_icc_path(struct dpu_kms *dpu_kms)
> struct icc_path *path1;
> struct drm_device *dev = dpu_kms->dev;
>
> - path0 = of_icc_get(dev->dev, "mdp0-mem");
> - path1 = of_icc_get(dev->dev, "mdp1-mem");
> + path0 = of_icc_get(dev->dev->parent, "mdp0-mem");
dev->dev->parent is long
> + path1 = of_icc_get(dev->dev->parent, "mdp1-mem");
>
> if (IS_ERR_OR_NULL(path0))
> return PTR_ERR_OR_ZERO(path0);
> @@ -837,6 +837,9 @@ static void dpu_kms_destroy(struct msm_kms *kms)
> _dpu_kms_hw_destroy(dpu_kms);
>
> msm_kms_destroy(&dpu_kms->base);
> +
> + if (dpu_kms->rpm_enabled)
> + pm_runtime_disable(&dpu_kms->pdev->dev);
> }
>
> static irqreturn_t dpu_irq(struct msm_kms *kms)
> @@ -978,7 +981,7 @@ static int _dpu_kms_mmu_init(struct dpu_kms *dpu_kms)
> if (!domain)
> return 0;
>
> - mmu = msm_iommu_new(dpu_kms->dev->dev, domain);
> + mmu = msm_iommu_new(dpu_kms->dev->dev->parent, domain);
And dpu_kms->dev->dev->parent is longer. Can we get some local variable
or something that is more descriptive? I guess it is an 'mdss_dev'?
> if (IS_ERR(mmu)) {
> iommu_domain_free(domain);
> return PTR_ERR(mmu);
> @@ -1172,40 +1175,15 @@ static int dpu_kms_hw_init(struct msm_kms *kms)
> return rc;
> }
>
> -static int dpu_kms_init(struct drm_device *dev)
> -{
> - struct msm_drm_private *priv;
> - struct dpu_kms *dpu_kms;
> - int irq;
> -
> - if (!dev) {
> - DPU_ERROR("drm device node invalid\n");
> - return -EINVAL;
> - }
> -
> - priv = dev->dev_private;
> - dpu_kms = to_dpu_kms(priv->kms);
> -
> - irq = irq_of_parse_and_map(dpu_kms->pdev->dev.of_node, 0);
> - if (irq < 0) {
> - DPU_ERROR("failed to get irq: %d\n", irq);
> - return irq;
> - }
> - dpu_kms->base.irq = irq;
> -
> - return 0;
> -}
> -
> -static int dpu_bind(struct device *dev, struct device *master, void *data)
> +static int dpu_kms_init(struct drm_device *ddev)
> {
> - struct msm_drm_private *priv = dev_get_drvdata(master);
> + struct msm_drm_private *priv = ddev->dev_private;
> + struct device *dev = ddev->dev;
> struct platform_device *pdev = to_platform_device(dev);
> - struct drm_device *ddev = priv->dev;
> struct dpu_kms *dpu_kms;
> + int irq;
> int ret = 0;
>
> - priv->kms_init = dpu_kms_init;
> -
> dpu_kms = devm_kzalloc(&pdev->dev, sizeof(*dpu_kms), GFP_KERNEL);
> if (!dpu_kms)
> return -ENOMEM;
> @@ -1227,8 +1205,6 @@ static int dpu_bind(struct device *dev, struct device *master, void *data)
> }
> dpu_kms->num_clocks = ret;
>
> - platform_set_drvdata(pdev, dpu_kms);
> -
> ret = msm_kms_init(&dpu_kms->base, &kms_funcs);
> if (ret) {
> DPU_ERROR("failed to init kms, ret=%d\n", ret);
> @@ -1242,31 +1218,25 @@ static int dpu_bind(struct device *dev, struct device *master, void *data)
>
> priv->kms = &dpu_kms->base;
>
> - return ret;
> -}
> -
> -static void dpu_unbind(struct device *dev, struct device *master, void *data)
> -{
> - struct platform_device *pdev = to_platform_device(dev);
> - struct dpu_kms *dpu_kms = platform_get_drvdata(pdev);
> + irq = irq_of_parse_and_map(dpu_kms->pdev->dev.of_node, 0);
Why doesn't platform_get_irq() work? This is code movement but I'm
trying to understand why OF APIs are required.
> + if (irq < 0) {
> + DPU_ERROR("failed to get irq: %d\n", irq);
> + return irq;
> + }
> + dpu_kms->base.irq = irq;
>
> - if (dpu_kms->rpm_enabled)
> - pm_runtime_disable(&pdev->dev);
> + return 0;
> }
>
> diff --git a/drivers/gpu/drm/msm/msm_kms.h b/drivers/gpu/drm/msm/msm_kms.h
> index 1f571372e928..ab25fff271f9 100644
> --- a/drivers/gpu/drm/msm/msm_kms.h
> +++ b/drivers/gpu/drm/msm/msm_kms.h
> @@ -194,9 +194,6 @@ static inline void msm_kms_destroy(struct msm_kms *kms)
> msm_atomic_destroy_pending_timer(&kms->pending_timers[i]);
> }
>
> -extern const struct of_device_id dpu_dt_match[];
> -extern const struct of_device_id mdp5_dt_match[];
> -
> #define for_each_crtc_mask(dev, crtc, crtc_mask) \
> drm_for_each_crtc(crtc, dev) \
> for_each_if (drm_crtc_mask(crtc) & (crtc_mask))
> diff --git a/drivers/gpu/drm/msm/msm_mdss.c b/drivers/gpu/drm/msm/msm_mdss.c
> index 7451105cbf01..9ecae833037d 100644
> --- a/drivers/gpu/drm/msm/msm_mdss.c
> +++ b/drivers/gpu/drm/msm/msm_mdss.c
> @@ -329,14 +310,7 @@ static int mdss_probe(struct platform_device *pdev)
> if (IS_ERR(mdss))
> return PTR_ERR(mdss);
>
> - priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
> - if (!priv) {
> - ret = -ENOMEM;
> - goto fail;
> - }
> -
> - priv->mdss = mdss;
> - platform_set_drvdata(pdev, priv);
> + platform_set_drvdata(pdev, mdss);
>
> /*
> * MDP5/DPU based devices don't have a flat hierarchy. There is a top
> @@ -350,39 +324,18 @@ static int mdss_probe(struct platform_device *pdev)
> goto fail;
Can the goto fail be removed? And replaced with
if (ret)
msm_mdss_destroy(mdss)
return ret;
> }
>
> - mdp_dev = device_find_child(dev, NULL, find_mdp_node);
> - if (!mdp_dev) {
> - DRM_DEV_ERROR(dev, "failed to find MDSS MDP node\n");
> - of_platform_depopulate(dev);
> - ret = -ENODEV;
> - goto fail;
> - }
> -
> - /*
> - * on MDP5 based platforms, the MDSS platform device is the component
> - * that adds MDP5 and other display interface components to
> - * itself.
> - */
> - ret = msm_drv_probe(dev, mdp_dev);
> - put_device(mdp_dev);
> - if (ret)
> - goto fail;
> -
I see a lot of removal of 'goto fail'.
> return 0;
>
> fail:
> - of_platform_depopulate(dev);
> - msm_mdss_destroy(priv->mdss);
> + msm_mdss_destroy(mdss);
>
> return ret;
> }
>
