drm/msm: don't create GPU-related debugfs files with no GPU present

If there is no GPU present, skip creation of the GPU-related debugfs
files, making the MSM's debugfs more usable.
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Patchwork: https://patchwork.freedesktop.org/patch/561742/Signed-off-by: Rob Clark <robdclark@chromium.org>

drivers/gpu/drm/msm/msm_debugfs.c

@@ -304,36 +304,21 @@ int msm_debugfs_late_init(struct drm_device *dev)
 	return ret;
 }
 
-void msm_debugfs_init(struct drm_minor *minor)
+static void msm_debugfs_gpu_init(struct drm_minor *minor)
 {
 	struct drm_device *dev = minor->dev;
 	struct msm_drm_private *priv = dev->dev_private;
 	struct dentry *gpu_devfreq;
 
-	drm_debugfs_create_files(msm_debugfs_list,
-				 ARRAY_SIZE(msm_debugfs_list),
-				 minor->debugfs_root, minor);
-
 	debugfs_create_file("gpu", S_IRUSR, minor->debugfs_root,
 		dev, &msm_gpu_fops);
 
-	if (priv->kms) {
-		drm_debugfs_create_files(msm_kms_debugfs_list,
-					 ARRAY_SIZE(msm_kms_debugfs_list),
-					 minor->debugfs_root, minor);
-		debugfs_create_file("kms", S_IRUSR, minor->debugfs_root,
-				    dev, &msm_kms_fops);
-	}
-
 	debugfs_create_u32("hangcheck_period_ms", 0600, minor->debugfs_root,
 		&priv->hangcheck_period);
 
 	debugfs_create_bool("disable_err_irq", 0600, minor->debugfs_root,
 		&priv->disable_err_irq);
 
-	debugfs_create_file("shrink", S_IRWXU, minor->debugfs_root,
-		dev, &shrink_fops);
-
 	gpu_devfreq = debugfs_create_dir("devfreq", minor->debugfs_root);
 
 	debugfs_create_bool("idle_clamp",0600, gpu_devfreq,
@@ -344,6 +329,30 @@ void msm_debugfs_init(struct drm_minor *minor)
 
 	debugfs_create_u32("downdifferential",0600, gpu_devfreq,
 			   &priv->gpu_devfreq_config.downdifferential);
+}
+
+void msm_debugfs_init(struct drm_minor *minor)
+{
+	struct drm_device *dev = minor->dev;
+	struct msm_drm_private *priv = dev->dev_private;
+
+	drm_debugfs_create_files(msm_debugfs_list,
+				 ARRAY_SIZE(msm_debugfs_list),
+				 minor->debugfs_root, minor);
+
+	if (priv->gpu_pdev)
+		msm_debugfs_gpu_init(minor);
+
+	if (priv->kms) {
+		drm_debugfs_create_files(msm_kms_debugfs_list,
+					 ARRAY_SIZE(msm_kms_debugfs_list),
+					 minor->debugfs_root, minor);
+		debugfs_create_file("kms", S_IRUSR, minor->debugfs_root,
+				    dev, &msm_kms_fops);
+	}
+
+	debugfs_create_file("shrink", S_IRWXU, minor->debugfs_root,
+		dev, &shrink_fops);
 
 	if (priv->kms && priv->kms->funcs->debugfs_init)
 		priv->kms->funcs->debugfs_init(priv->kms, minor);

drivers/gpu/drm/msm/msm_rd.c

@@ -270,6 +270,9 @@ int msm_rd_debugfs_init(struct drm_minor *minor)
 	struct msm_rd_state *rd;
 	int ret;
 
+	if (!priv->gpu_pdev)
+		return 0;
+
 	/* only create on first minor: */
 	if (priv->rd)
 		return 0;