v3d_drv: Handle missing clock more gracefully

raspberrypi inclusion
category: feature
bugzilla: 50432

--------------------------------
Signed-off-by: Npopcornmix <popcornmix@gmail.com>
Signed-off-by: NFang Yafen <yafen@iscas.ac.cn>
Signed-off-by: NZheng Zengkai <zhengzengkai@huawei.com>

drivers/gpu/drm/v3d/v3d_drv.c

@@ -290,10 +290,10 @@ static int v3d_platform_drm_probe(struct platform_device *pdev)
 	}
 
 	v3d->clk = devm_clk_get(dev, NULL);
-	if (IS_ERR(v3d->clk)) {
-		if (ret != -EPROBE_DEFER)
-			dev_err(dev, "Failed to get clock\n");
-		goto dev_free;
+	if (IS_ERR_OR_NULL(v3d->clk)) {
+		if (PTR_ERR(v3d->clk) != -EPROBE_DEFER)
+			dev_err(dev, "Failed to get clock (%ld)\n", PTR_ERR(v3d->clk));
+		return PTR_ERR(v3d->clk);
 	}
 	v3d->clk_up_rate = clk_get_rate(v3d->clk);
 	/* For downclocking, drop it to the minimum frequency we can get from