drm/tegra: dsi: Make use of the helper function dev_err_probe()

When possible use dev_err_probe help to properly deal with the
PROBE_DEFER error, the benefit is that DEFER issue will be logged
in the devices_deferred debugfs file.
And using dev_err_probe() can reduce code size, the error value
gets printed.

Signed-off-by: Cai Huoqing <[e-mail]>
Signed-off-by: Thierry Reding <[e-mail]>

drivers/gpu/drm/tegra/dsi.c

···
 	}
 
 	dsi->clk = devm_clk_get(&pdev->dev, NULL);
-	if (IS_ERR(dsi->clk)) {
-		dev_err(&pdev->dev, "cannot get DSI clock\n");
-		return PTR_ERR(dsi->clk);
-	}
+	if (IS_ERR(dsi->clk))
+		return dev_err_probe(&pdev->dev, PTR_ERR(dsi->clk),
+				     "cannot get DSI clock\n");
 
 	dsi->clk_lp = devm_clk_get(&pdev->dev, "lp");
-	if (IS_ERR(dsi->clk_lp)) {
-		dev_err(&pdev->dev, "cannot get low-power clock\n");
-		return PTR_ERR(dsi->clk_lp);
-	}
+	if (IS_ERR(dsi->clk_lp))
+		return dev_err_probe(&pdev->dev, PTR_ERR(dsi->clk_lp),
+				     "cannot get low-power clock\n");
 
 	dsi->clk_parent = devm_clk_get(&pdev->dev, "parent");
-	if (IS_ERR(dsi->clk_parent)) {
-		dev_err(&pdev->dev, "cannot get parent clock\n");
-		return PTR_ERR(dsi->clk_parent);
-	}
+	if (IS_ERR(dsi->clk_parent))
+		return dev_err_probe(&pdev->dev, PTR_ERR(dsi->clk_parent),
+				     "cannot get parent clock\n");
 
 	dsi->vdd = devm_regulator_get(&pdev->dev, "avdd-dsi-csi");
-	if (IS_ERR(dsi->vdd)) {
-		dev_err(&pdev->dev, "cannot get VDD supply\n");
-		return PTR_ERR(dsi->vdd);
-	}
+	if (IS_ERR(dsi->vdd))
+		return dev_err_probe(&pdev->dev, PTR_ERR(dsi->vdd),
+				     "cannot get VDD supply\n");
 
 	err = tegra_dsi_setup_clocks(dsi);
 	if (err < 0) {