[PATCH 34/49] drm/amd/display: Check if set_blank_data_double_buffer exists before call

[sunpeng.li at amd.com]

From: Vitaly Prosyak <vitaly.prosyak at amd.com>

Not all ASIC types have this function implemented - check before
calling.

Signed-off-by: Vitaly Prosyak <vitaly.prosyak at amd.com>
Reviewed-by: Julian Parkin <jparkin at amd.com>
Acked-by: Leo Li <sunpeng.li at amd.com>
---
 drivers/gpu/drm/amd/display/dc/dcn10/dcn10_hw_sequencer.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/amd/display/dc/dcn10/dcn10_hw_sequencer.c b/drivers/gpu/drm/amd/display/dc/dcn10/dcn10_hw_sequencer.c
index b08632ba6211..0a5c75e737a5 100644
--- a/drivers/gpu/drm/amd/display/dc/dcn10/dcn10_hw_sequencer.c
+++ b/drivers/gpu/drm/amd/display/dc/dcn10/dcn10_hw_sequencer.c
@@ -720,7 +720,8 @@ static void false_optc_underflow_wa(
 		dc->hwss.wait_for_mpcc_disconnect(dc, dc->res_pool, old_pipe_ctx);
 	}
 
-	tg->funcs->set_blank_data_double_buffer(tg, true);
+	if (tg->funcs->set_blank_data_double_buffer)
+		tg->funcs->set_blank_data_double_buffer(tg, true);
 
 	if (tg->funcs->is_optc_underflow_occurred(tg) && !underflow)
 		tg->funcs->clear_optc_underflow(tg);
-- 
2.22.0