[PATCH 65/77] drm/amd/display: Fix time out on boot

[Harry Wentland]

From: Eric Yang <Eric.Yang2 at amd.com>

On boot, hubp 0 is powergated during enable accel mode, so we time out
when we try to blank in undo wa.

Fix: Check power gate status before set blank

Change-Id: Ia14455722e5a8b6136d47083f1986827ed07175a
Signed-off-by: Eric Yang <Eric.Yang2 at amd.com>
Reviewed-by: Hersen Wu <hersenxs.wu at amd.com>
Acked-by: Harry Wentland <Harry.Wentland at amd.com>
---
 drivers/gpu/drm/amd/display/dc/dcn10/dcn10_hw_sequencer.c | 6 ++++++
 1 file changed, 6 insertions(+)

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 71ff1cedbdf4..7ea274475598 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
@@ -780,6 +780,12 @@ static void undo_DEGVIDCN10_253_wa(struct dc *dc)
 {
 	struct dce_hwseq *hws = dc->hwseq;
 	struct mem_input *mi = dc->res_pool->mis[0];
+	int pwr_status = 0;
+
+	REG_GET(DOMAIN0_PG_STATUS, DOMAIN0_PGFSM_PWR_STATUS, &pwr_status);
+	/* Don't need to blank if hubp is power gated*/
+	if (pwr_status == 2)
+		return;
 
 	mi->funcs->set_blank(mi, true);
 
-- 
2.11.0