[PATCH v2 2/5] drm/msm/dpu: support binding to the mdp5 devices

[Dmitry Baryshkov]

Existing MDP5 devices have slightly different bindings. The main
register region is called `mdp_phys' instead of `mdp'. Also vbif
register regions are a part of the parent, MDSS device. Add support for
handling this binding differences.

Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov at linaro.org>
---
 drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c | 88 ++++++++++++++++++++-----
 drivers/gpu/drm/msm/msm_drv.h           |  3 +
 drivers/gpu/drm/msm/msm_io_utils.c      | 13 ++++
 3 files changed, 86 insertions(+), 18 deletions(-)

diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c
index 82381d12414d..20ba03e9c936 100644
--- a/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c
+++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c
@@ -1054,37 +1054,53 @@ unsigned long dpu_kms_get_clk_rate(struct dpu_kms *dpu_kms, char *clock_name)
 
 #define	DPU_PERF_DEFAULT_MAX_CORE_CLK_RATE	412500000
 
-static int dpu_kms_hw_init(struct msm_kms *kms)
+static int dpu_kms_mmap_mdp5(struct dpu_kms *dpu_kms)
 {
-	struct dpu_kms *dpu_kms;
-	struct drm_device *dev;
-	int i, rc = -EINVAL;
-	unsigned long max_core_clk_rate;
-	u32 core_rev;
+	struct platform_device *mdss_dev;
+	int rc;
 
-	if (!kms) {
-		DPU_ERROR("invalid kms\n");
+	mdss_dev = to_platform_device(dpu_kms->pdev->dev.parent);
+
+	dpu_kms->mmio = msm_ioremap(dpu_kms->pdev, "mdp_phys");
+	if (IS_ERR(dpu_kms->mmio)) {
+		rc = PTR_ERR(dpu_kms->mmio);
+		DPU_ERROR("mdp register memory map failed: %d\n", rc);
+		dpu_kms->mmio = NULL;
 		return rc;
 	}
+	DRM_DEBUG("mapped dpu address space @%pK\n", dpu_kms->mmio);
 
-	dpu_kms = to_dpu_kms(kms);
-	dev = dpu_kms->dev;
+	dpu_kms->vbif[VBIF_RT] = msm_ioremap_mdss(mdss_dev,
+						  dpu_kms->pdev,
+						  "vbif_phys");
+	if (IS_ERR(dpu_kms->vbif[VBIF_RT])) {
+		rc = PTR_ERR(dpu_kms->vbif[VBIF_RT]);
+		DPU_ERROR("vbif register memory map failed: %d\n", rc);
+		dpu_kms->vbif[VBIF_RT] = NULL;
+		return rc;
+	}
 
-	dev->mode_config.cursor_width = 512;
-	dev->mode_config.cursor_height = 512;
+	dpu_kms->vbif[VBIF_NRT] = msm_ioremap_mdss(mdss_dev,
+						   dpu_kms->pdev,
+						   "vbif_nrt_phys");
+	if (IS_ERR(dpu_kms->vbif[VBIF_NRT])) {
+		dpu_kms->vbif[VBIF_NRT] = NULL;
+		DPU_DEBUG("VBIF NRT is not defined");
+	}
 
-	rc = dpu_kms_global_obj_init(dpu_kms);
-	if (rc)
-		return rc;
+	return 0;
+}
 
-	atomic_set(&dpu_kms->bandwidth_ref, 0);
+static int dpu_kms_mmap_dpu(struct dpu_kms *dpu_kms)
+{
+	int rc;
 
 	dpu_kms->mmio = msm_ioremap(dpu_kms->pdev, "mdp");
 	if (IS_ERR(dpu_kms->mmio)) {
 		rc = PTR_ERR(dpu_kms->mmio);
 		DPU_ERROR("mdp register memory map failed: %d\n", rc);
 		dpu_kms->mmio = NULL;
-		goto error;
+		return rc;
 	}
 	DRM_DEBUG("mapped dpu address space @%pK\n", dpu_kms->mmio);
 
@@ -1093,14 +1109,50 @@ static int dpu_kms_hw_init(struct msm_kms *kms)
 		rc = PTR_ERR(dpu_kms->vbif[VBIF_RT]);
 		DPU_ERROR("vbif register memory map failed: %d\n", rc);
 		dpu_kms->vbif[VBIF_RT] = NULL;
-		goto error;
+		return rc;
 	}
+
 	dpu_kms->vbif[VBIF_NRT] = msm_ioremap_quiet(dpu_kms->pdev, "vbif_nrt");
 	if (IS_ERR(dpu_kms->vbif[VBIF_NRT])) {
 		dpu_kms->vbif[VBIF_NRT] = NULL;
 		DPU_DEBUG("VBIF NRT is not defined");
 	}
 
+	return 0;
+}
+
+static int dpu_kms_hw_init(struct msm_kms *kms)
+{
+	struct dpu_kms *dpu_kms;
+	struct drm_device *dev;
+	int i, rc = -EINVAL;
+	unsigned long max_core_clk_rate;
+	u32 core_rev;
+
+	if (!kms) {
+		DPU_ERROR("invalid kms\n");
+		return rc;
+	}
+
+	dpu_kms = to_dpu_kms(kms);
+	dev = dpu_kms->dev;
+
+	dev->mode_config.cursor_width = 512;
+	dev->mode_config.cursor_height = 512;
+
+	rc = dpu_kms_global_obj_init(dpu_kms);
+	if (rc)
+		return rc;
+
+	atomic_set(&dpu_kms->bandwidth_ref, 0);
+
+	if (of_device_is_compatible(dpu_kms->pdev->dev.of_node, "qcom,mdp5"))
+		rc = dpu_kms_mmap_mdp5(dpu_kms);
+	else
+		rc = dpu_kms_mmap_dpu(dpu_kms);
+	if (rc)
+		return rc;
+
 	dpu_kms_parse_data_bus_icc_path(dpu_kms);
 
 	rc = pm_runtime_resume_and_get(&dpu_kms->pdev->dev);
diff --git a/drivers/gpu/drm/msm/msm_drv.h b/drivers/gpu/drm/msm/msm_drv.h
index e2fc56f161b5..6eeb3517c3e4 100644
--- a/drivers/gpu/drm/msm/msm_drv.h
+++ b/drivers/gpu/drm/msm/msm_drv.h
@@ -485,6 +485,9 @@ void __iomem *msm_ioremap(struct platform_device *pdev, const char *name);
 void __iomem *msm_ioremap_size(struct platform_device *pdev, const char *name,
 		phys_addr_t *size);
 void __iomem *msm_ioremap_quiet(struct platform_device *pdev, const char *name);
+void __iomem *msm_ioremap_mdss(struct platform_device *mdss_pdev,
+			       struct platform_device *dev,
+			       const char *name);
 
 struct icc_path *msm_icc_get(struct device *dev, const char *name);
 
diff --git a/drivers/gpu/drm/msm/msm_io_utils.c b/drivers/gpu/drm/msm/msm_io_utils.c
index 59d2788c4510..afedd61c3e28 100644
--- a/drivers/gpu/drm/msm/msm_io_utils.c
+++ b/drivers/gpu/drm/msm/msm_io_utils.c
@@ -50,6 +50,19 @@ struct clk *msm_clk_get(struct platform_device *pdev, const char *name)
 	return clk;
 }
 
+void __iomem *msm_ioremap_mdss(struct platform_device *mdss_pdev,
+			       struct platform_device *pdev,
+			       const char *name)
+{
+	struct resource *res;
+
+	res = platform_get_resource_byname(mdss_pdev, IORESOURCE_MEM, name);
+	if (!res)
+		return ERR_PTR(-EINVAL);
+
+	return devm_ioremap_resource(&pdev->dev, res);
+}
+
 static void __iomem *_msm_ioremap(struct platform_device *pdev, const char *name,
 				  bool quiet, phys_addr_t *psize)
 {
-- 
2.39.2