drm/lima: Reduce the amount of logs on deferred probe

There is no point to print deferred probe (and its failures to get
resources) as an error. For example getting a regulator causes three
unneeded error messages:

lima 13000000.gpu: failed to get regulator: -517
lima 13000000.gpu: regulator init fail -517
lima 13000000.gpu: Fatal error during GPU init

Also do not print clock rates before the initialization finishes
because they will be duplicated after deferral. Each probe step already
prints error so remove the final error message "Fatal error during GPU
init".

In case of multiple probe tries this would pollute the dmesg.

Fixes: a1d2a6339961 ("drm/lima: driver for ARM Mali4xx GPUs")
Signed-off-by: Krzysztof Kozlowski <[e-mail]>
Signed-off-by: Qiang Yu <[e-mail]>
Link: https://patchwork.freedesktop.org/patch/msgid/[e-mail]

drivers/gpu/drm/lima/lima_device.c

···
 static int lima_clk_init(struct lima_device *dev)
 {
 	int err;
-	unsigned long bus_rate, gpu_rate;
 
 	dev->clk_bus = devm_clk_get(dev->dev, "bus");
 	if (IS_ERR(dev->clk_bus)) {
···
 		dev_err(dev->dev, "get core clk failed %ld\n", PTR_ERR(dev->clk_gpu));
 		return PTR_ERR(dev->clk_gpu);
 	}
-
-	bus_rate = clk_get_rate(dev->clk_bus);
-	dev_info(dev->dev, "bus rate = %lu\n", bus_rate);
-
-	gpu_rate = clk_get_rate(dev->clk_gpu);
-	dev_info(dev->dev, "mod rate = %lu", gpu_rate);
 
 	err = clk_prepare_enable(dev->clk_bus);
 	if (err)
···
 		dev->regulator = NULL;
 		if (ret == -ENODEV)
 			return 0;
-		dev_err(dev->dev, "failed to get regulator: %d\n", ret);
+		if (ret != -EPROBE_DEFER)
+			dev_err(dev->dev, "failed to get regulator: %d\n", ret);
 		return ret;
 	}
 
···
 	}
 
 	err = lima_regulator_init(ldev);
-	if (err) {
-		dev_err(ldev->dev, "regulator init fail %d\n", err);
+	if (err)
 		goto err_out0;
-	}
 
 	ldev->empty_vm = lima_vm_create(ldev);
 	if (!ldev->empty_vm) {
···
 	err = lima_init_pp_pipe(ldev);
 	if (err)
 		goto err_out5;
+
+	dev_info(ldev->dev, "bus rate = %lu\n", clk_get_rate(ldev->clk_bus));
+	dev_info(ldev->dev, "mod rate = %lu", clk_get_rate(ldev->clk_gpu));
 
 	return 0;
 

drivers/gpu/drm/lima/lima_drv.c

···
 	ldev->ddev = ddev;
 
 	err = lima_device_init(ldev);
-	if (err) {
-		dev_err(&pdev->dev, "Fatal error during GPU init\n");
+	if (err)
 		goto err_out1;
-	}
 
 	/*
 	 * Register the DRM device with the core and the connectors with