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>

diff --git a/drivers/gpu/drm/tegra/dpaux.c b/drivers/gpu/drm/tegra/dpaux.c
index 07b26972f487967cb1b4203488f0387c9e0736fc..c96c21bd91c10f67e874c609d429ac41218f2bc9 100644 (file)
--- 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);