drm/amd/display: Dont aser if DP_DPHY_INTERNAL_CTRL

No need to assert just return
Signed-off-by: Eric Bernstein <eric.bernstein@amd.com>
Reviewed-by: Charlene Liu <Charlene.Liu@amd.com>
Acked-by: Bhawanpreet Lakha <Bhawanpreet.Lakha@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/display/dc/dcn10/dcn10_link_encoder.c

@@ -229,7 +229,9 @@ static void setup_panel_mode(
 {
 	uint32_t value;
 
-	ASSERT(REG(DP_DPHY_INTERNAL_CTRL));
+	if (!REG(DP_DPHY_INTERNAL_CTRL))
+		return;
+
 	value = REG_READ(DP_DPHY_INTERNAL_CTRL);
 
 	switch (panel_mode) {