drm/amdgpu/display: move debugfs init into core amdgpu debugfs (v2)

In order to remove the load and unload drm callbacks,
we need to reorder the init sequence to move all the drm
debugfs file handling.  Do this for display.

v2: add config guard for DC
Tested-by: NThomas Zimmermann <tzimmermann@suse.de>
Reviewed-by: Harry Wentland <harry.wentland@amd.com> (v1)
Acked-by: Christian König <christian.koenig@amd.com> (v1)
Signed-off-by: NAlex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/amdgpu/amdgpu_debugfs.c

@@ -32,6 +32,7 @@
 
 #include "amdgpu.h"
 #include "amdgpu_pm.h"
+#include "amdgpu_dm_debugfs.h"
 
 /**
  * amdgpu_debugfs_add_files - Add simple debugfs entries
@@ -1316,6 +1317,13 @@ int amdgpu_debugfs_init(struct amdgpu_device *adev)
 	if (r)
 		DRM_ERROR("registering firmware debugfs failed (%d).\n", r);
 
+#if defined(CONFIG_DRM_AMD_DC)
+	if (amdgpu_device_has_dc_support(adev)) {
+		if (dtn_debugfs_init(adev))
+			DRM_ERROR("amdgpu: failed initialize dtn debugfs support.\n");
+	}
+#endif
+
 	for (i = 0; i < AMDGPU_MAX_RINGS; ++i) {
 		struct amdgpu_ring *ring = adev->rings[i];
 

drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c

@@ -1008,11 +1008,6 @@ static int amdgpu_dm_init(struct amdgpu_device *adev)
 		goto error;
 	}
 
-#if defined(CONFIG_DEBUG_FS)
-	if (dtn_debugfs_init(adev))
-		DRM_ERROR("amdgpu: failed initialize dtn debugfs support.\n");
-#endif
-
 	DRM_DEBUG_DRIVER("KMS initialized.\n");
 
 	return 0;