[PATCH v2 2/4] drm/msm/dpu: move resource allocation to the _probe function

[Dmitry Baryshkov]

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. While we are at it, replace irq_of_parse_and_map() with
platform_get_irq().

Reviewed-by: Abhinav Kumar <quic_abhinavk at quicinc.com>
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov at linaro.org>
---
 drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c | 64 ++++++++++++-------------
 1 file changed, 31 insertions(+), 33 deletions(-)

diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c
index ec6fb8634196..23f0dbd2dfa1 100644
--- a/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c
+++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c
@@ -1159,33 +1159,11 @@ static int dpu_kms_init(struct drm_device *ddev)
 	struct msm_drm_private *priv = ddev->dev_private;
 	struct device *dev = ddev->dev;
 	struct platform_device *pdev = to_platform_device(dev);
-	struct dpu_kms *dpu_kms;
-	int irq;
+	struct dpu_kms *dpu_kms = to_dpu_kms(priv->kms);
 	struct dev_pm_opp *opp;
 	int ret = 0;
 	unsigned long max_freq = ULONG_MAX;
 
-	dpu_kms = devm_kzalloc(&pdev->dev, sizeof(*dpu_kms), GFP_KERNEL);
-	if (!dpu_kms)
-		return -ENOMEM;
-
-	ret = devm_pm_opp_set_clkname(dev, "core");
-	if (ret)
-		return ret;
-	/* OPP table is optional */
-	ret = devm_pm_opp_of_add_table(dev);
-	if (ret && ret != -ENODEV) {
-		dev_err(dev, "invalid OPP table in device tree\n");
-		return ret;
-	}
-
-	ret = devm_clk_bulk_get_all(&pdev->dev, &dpu_kms->clocks);
-	if (ret < 0) {
-		DPU_ERROR("failed to parse clocks, ret=%d\n", ret);
-		return ret;
-	}
-	dpu_kms->num_clocks = ret;
-
 	opp = dev_pm_opp_find_freq_floor(dev, &max_freq);
 	if (!IS_ERR(opp))
 		dev_pm_opp_put(opp);
@@ -1203,21 +1181,41 @@ static int dpu_kms_init(struct drm_device *ddev)
 	pm_runtime_enable(&pdev->dev);
 	dpu_kms->rpm_enabled = true;
 
-	priv->kms = &dpu_kms->base;
-
-	irq = irq_of_parse_and_map(dpu_kms->pdev->dev.of_node, 0);
-	if (!irq) {
-		DPU_ERROR("failed to get irq\n");
-		return -EINVAL;
-	}
-	dpu_kms->base.irq = irq;
-
 	return 0;
 }
 
 static int dpu_dev_probe(struct platform_device *pdev)
 {
-	return msm_drv_probe(&pdev->dev, dpu_kms_init, NULL);
+	struct device *dev = &pdev->dev;
+	struct dpu_kms *dpu_kms;
+	int irq;
+	int ret = 0;
+
+	dpu_kms = devm_kzalloc(dev, sizeof(*dpu_kms), GFP_KERNEL);
+	if (!dpu_kms)
+		return -ENOMEM;
+
+	ret = devm_pm_opp_set_clkname(dev, "core");
+	if (ret)
+		return ret;
+	/* OPP table is optional */
+	ret = devm_pm_opp_of_add_table(dev);
+	if (ret && ret != -ENODEV)
+		return dev_err_probe(dev, ret, "invalid OPP table in device tree\n");
+
+	ret = devm_clk_bulk_get_all(&pdev->dev, &dpu_kms->clocks);
+	if (ret < 0)
+		return dev_err_probe(dev, ret, "failed to parse clocks\n");
+
+	dpu_kms->num_clocks = ret;
+
+	irq = platform_get_irq(pdev, 0);
+	if (irq < 0)
+		return dev_err_probe(dev, irq, "failed to get irq\n");
+
+	dpu_kms->base.irq = irq;
+
+	return msm_drv_probe(&pdev->dev, dpu_kms_init, &dpu_kms->base);
 }
 
 static int dpu_dev_remove(struct platform_device *pdev)
-- 
2.39.2