drm/crc: Actually allow to change the crc source

Oops.

Fixes: 9edbf1f ("drm: Add API for capturing frame CRCs")
Cc: Tomeu Vizoso <[email protected]>
Cc: Emil Velikov <[email protected]>
Cc: Benjamin Gaignard <[email protected]>
Signed-off-by: Daniel Vetter <[email protected]>
Reviewed-by: Ville Syrjälä <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]

drivers/gpu/drm/drm_debugfs_crc.c

@@ -372,7 +372,7 @@ void drm_debugfs_crtc_crc_add(struct drm_crtc *crtc)
 
 	crc_ent = debugfs_create_dir("crc", crtc->debugfs_entry);
 
-	debugfs_create_file("control", S_IRUGO, crc_ent, crtc,
+	debugfs_create_file("control", S_IRUGO | S_IWUSR, crc_ent, crtc,
 			    &drm_crtc_crc_control_fops);
 	debugfs_create_file("data", S_IRUGO, crc_ent, crtc,
 			    &drm_crtc_crc_data_fops);