drm/vc4: Drop WARN for HVS FIFOs not being empty

The reset condition for the EMPTY flag in DISPSTATx is 0,
so seeing as we've just reset the pipeline there is no
guarantee that the flag will denote empty if it hasn't been
enabled.

Drop the WARN.

Signed-off-by: Dave Stevenson <[email protected]>

Author: 6by9

drivers/gpu/drm/vc4/vc4_hvs.c

@@ -1005,10 +1005,6 @@ static void __vc4_hvs_stop_channel(struct vc4_hvs *hvs, unsigned int chan)
 				   SCALER_DISPSTATX_MODE) !=
 		     SCALER_DISPSTATX_MODE_DISABLED);
 
-	WARN_ON_ONCE((HVS_READ(SCALER_DISPSTATX(chan)) &
-		      (SCALER_DISPSTATX_FULL | SCALER_DISPSTATX_EMPTY)) !=
-		     SCALER_DISPSTATX_EMPTY);
-
 out:
 	drm_dev_exit(idx);
 }