drm/msm/mdp5: move resource allocation to the _probe function

To let the probe function bail early if any of the resources is
unavailable, move resource allocattion from kms_init directly to the
probe callback.

Reviewed-by: Abhinav Kumar <quic_abhinavk@quicinc.com>
Reviewed-by: Rob Clark <robdclark@gmail.com>
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Patchwork: https://patchwork.freedesktop.org/patch/561630/
Signed-off-by: Rob Clark <robdclark@chromium.org>

drivers/gpu/drm/msm/disp/mdp5/mdp5_kms.c

@@ -554,20 +554,16 @@ static int mdp5_kms_init(struct drm_device *dev)
 	struct platform_device *pdev;
 	struct mdp5_kms *mdp5_kms;
 	struct mdp5_cfg *config;
-	struct msm_kms *kms;
+	struct msm_kms *kms = priv->kms;
 	struct msm_gem_address_space *aspace;
-	int irq, i, ret;
+	int i, ret;
 
 	ret = mdp5_init(to_platform_device(dev->dev), dev);
 	if (ret)
 		return ret;
 
-	/* priv->kms would have been populated by the MDP5 driver */
-	kms = priv->kms;
-	if (!kms)
-		return -ENOMEM;
-
 	mdp5_kms = to_mdp5_kms(to_mdp_kms(kms));
+
 	pdev = mdp5_kms->pdev;
 
 	ret = mdp_kms_init(&mdp5_kms->base, &kms_funcs);
@@ -576,15 +572,6 @@ static int mdp5_kms_init(struct drm_device *dev)
 		goto fail;
 	}
 
-	irq = irq_of_parse_and_map(pdev->dev.of_node, 0);
-	if (!irq) {
-		ret = -EINVAL;
-		DRM_DEV_ERROR(&pdev->dev, "failed to get irq\n");
-		goto fail;
-	}
-
-	kms->irq = irq;
-
 	config = mdp5_cfg_get_config(mdp5_kms->cfg);
 
 	/* make sure things are off before attaching iommu (bootloader could
@@ -787,60 +774,23 @@ static int interface_init(struct mdp5_kms *mdp5_kms)
 static int mdp5_init(struct platform_device *pdev, struct drm_device *dev)
 {
 	struct msm_drm_private *priv = dev->dev_private;
-	struct mdp5_kms *mdp5_kms;
+	struct mdp5_kms *mdp5_kms = to_mdp5_kms(to_mdp_kms(priv->kms));
 	struct mdp5_cfg *config;
 	u32 major, minor;
 	int ret;
 
-	mdp5_kms = devm_kzalloc(&pdev->dev, sizeof(*mdp5_kms), GFP_KERNEL);
-	if (!mdp5_kms) {
-		ret = -ENOMEM;
-		goto fail;
-	}
-
-	spin_lock_init(&mdp5_kms->resource_lock);
-
 	mdp5_kms->dev = dev;
-	mdp5_kms->pdev = pdev;
 
 	ret = mdp5_global_obj_init(mdp5_kms);
 	if (ret)
 		goto fail;
 
-	mdp5_kms->mmio = msm_ioremap(pdev, "mdp_phys");
-	if (IS_ERR(mdp5_kms->mmio)) {
-		ret = PTR_ERR(mdp5_kms->mmio);
-		goto fail;
-	}
-
-	/* mandatory clocks: */
-	ret = get_clk(pdev, &mdp5_kms->axi_clk, "bus", true);
-	if (ret)
-		goto fail;
-	ret = get_clk(pdev, &mdp5_kms->ahb_clk, "iface", true);
-	if (ret)
-		goto fail;
-	ret = get_clk(pdev, &mdp5_kms->core_clk, "core", true);
-	if (ret)
-		goto fail;
-	ret = get_clk(pdev, &mdp5_kms->vsync_clk, "vsync", true);
-	if (ret)
-		goto fail;
-
-	/* optional clocks: */
-	get_clk(pdev, &mdp5_kms->lut_clk, "lut", false);
-	get_clk(pdev, &mdp5_kms->tbu_clk, "tbu", false);
-	get_clk(pdev, &mdp5_kms->tbu_rt_clk, "tbu_rt", false);
-
 	/* we need to set a default rate before enabling.  Set a safe
 	 * rate first, then figure out hw revision, and then set a
 	 * more optimal rate:
 	 */
 	clk_set_rate(mdp5_kms->core_clk, 200000000);
 
-	/* set uninit-ed kms */
-	priv->kms = &mdp5_kms->base.base;
-
 	pm_runtime_enable(&pdev->dev);
 	mdp5_kms->rpm_enabled = true;
 
@@ -931,15 +881,53 @@ static int mdp5_setup_interconnect(struct platform_device *pdev)
 
 static int mdp5_dev_probe(struct platform_device *pdev)
 {
-	int ret;
+	struct mdp5_kms *mdp5_kms;
+	int ret, irq;
 
 	DBG("");
 
+	mdp5_kms = devm_kzalloc(&pdev->dev, sizeof(*mdp5_kms), GFP_KERNEL);
+	if (!mdp5_kms)
+		return -ENOMEM;
+
 	ret = mdp5_setup_interconnect(pdev);
 	if (ret)
 		return ret;
 
-	return msm_drv_probe(&pdev->dev, mdp5_kms_init, NULL);
+	mdp5_kms->pdev = pdev;
+
+	spin_lock_init(&mdp5_kms->resource_lock);
+
+	mdp5_kms->mmio = msm_ioremap(pdev, "mdp_phys");
+	if (IS_ERR(mdp5_kms->mmio))
+		return PTR_ERR(mdp5_kms->mmio);
+
+	/* mandatory clocks: */
+	ret = get_clk(pdev, &mdp5_kms->axi_clk, "bus", true);
+	if (ret)
+		return ret;
+	ret = get_clk(pdev, &mdp5_kms->ahb_clk, "iface", true);
+	if (ret)
+		return ret;
+	ret = get_clk(pdev, &mdp5_kms->core_clk, "core", true);
+	if (ret)
+		return ret;
+	ret = get_clk(pdev, &mdp5_kms->vsync_clk, "vsync", true);
+	if (ret)
+		return ret;
+
+	/* optional clocks: */
+	get_clk(pdev, &mdp5_kms->lut_clk, "lut", false);
+	get_clk(pdev, &mdp5_kms->tbu_clk, "tbu", false);
+	get_clk(pdev, &mdp5_kms->tbu_rt_clk, "tbu_rt", false);
+
+	irq = platform_get_irq(pdev, 0);
+	if (irq < 0)
+		return dev_err_probe(&pdev->dev, irq, "failed to get irq\n");
+
+	mdp5_kms->base.base.irq = irq;
+
+	return msm_drv_probe(&pdev->dev, mdp5_kms_init, &mdp5_kms->base.base);
 }
 
 static int mdp5_dev_remove(struct platform_device *pdev)