drm/tegra: dpaux: Provide error message in probe

When probing the dpaux device fails, output proper error messages to
help diagnose the cause of the failure.

Signed-off-by: Thierry Reding <treding@nvidia.com>

1 files changed, 24 insertions, 6 deletions

diff --git a/drivers/gpu/drm/tegra/dpaux.c b/drivers/gpu/drm/tegra/dpaux.c
index 07b26972f487..c96c21bd91c1 100644
--- a/drivers/gpu/drm/tegra/dpaux.c
+++ b/drivers/gpu/drm/tegra/dpaux.c
@@ -294,26 +294,41 @@ static int tegra_dpaux_probe(struct platform_device *pdev)
         }
 
         dpaux->rst = devm_reset_control_get(&pdev->dev, "dpaux");
-        if (IS_ERR(dpaux->rst))
+        if (IS_ERR(dpaux->rst)) {
+                dev_err(&pdev->dev, "failed to get reset control: %ld\n",
+                        PTR_ERR(dpaux->rst));
                 return PTR_ERR(dpaux->rst);
+        }
 
         dpaux->clk = devm_clk_get(&pdev->dev, NULL);
-        if (IS_ERR(dpaux->clk))
+        if (IS_ERR(dpaux->clk)) {
+                dev_err(&pdev->dev, "failed to get module clock: %ld\n",
+                        PTR_ERR(dpaux->clk));
                 return PTR_ERR(dpaux->clk);
+        }
 
         err = clk_prepare_enable(dpaux->clk);
-        if (err < 0)
+        if (err < 0) {
+                dev_err(&pdev->dev, "failed to enable module clock: %d\n",
+                        err);
                 return err;
+        }
 
         reset_control_deassert(dpaux->rst);
 
         dpaux->clk_parent = devm_clk_get(&pdev->dev, "parent");
-        if (IS_ERR(dpaux->clk_parent))
+        if (IS_ERR(dpaux->clk_parent)) {
+                dev_err(&pdev->dev, "failed to get parent clock: %ld\n",
+                        PTR_ERR(dpaux->clk_parent));
                 return PTR_ERR(dpaux->clk_parent);
+        }
 
         err = clk_prepare_enable(dpaux->clk_parent);
-        if (err < 0)
+        if (err < 0) {
+                dev_err(&pdev->dev, "failed to enable parent clock: %d\n",
+                        err);
                 return err;
+        }
 
         err = clk_set_rate(dpaux->clk_parent, 270000000);
         if (err < 0) {
@@ -323,8 +338,11 @@ static int tegra_dpaux_probe(struct platform_device *pdev)
         }
 
         dpaux->vdd = devm_regulator_get(&pdev->dev, "vdd");
-        if (IS_ERR(dpaux->vdd))
+        if (IS_ERR(dpaux->vdd)) {
+                dev_err(&pdev->dev, "failed to get VDD supply: %ld\n",
+                        PTR_ERR(dpaux->vdd));
                 return PTR_ERR(dpaux->vdd);
+        }
 
         err = devm_request_irq(dpaux->dev, dpaux->irq, tegra_dpaux_irq, 0,
                                dev_name(dpaux->dev), dpaux);