[PATCH 09/13] drm/amd/display: Exit from idle state before accessing HW data

[Aurabindo Pillai <aurabindo.pillai@xxxxxxx>]

From: Sung Joon Kim <sungkim@xxxxxxx>

[why & how]
User interface cannot guarantee system is in
idle state, so need to ensure we exit idle state
before accessing any HW data.

Reviewed-by: Nicholas Kazlauskas <nicholas.kazlauskas@xxxxxxx>
Acked-by: Aurabindo Pillai <aurabindo.pillai@xxxxxxx>
Signed-off-by: Sung Joon Kim <sungkim@xxxxxxx>
---
 drivers/gpu/drm/amd/display/dc/dce/dmub_abm.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/gpu/drm/amd/display/dc/dce/dmub_abm.c b/drivers/gpu/drm/amd/display/dc/dce/dmub_abm.c
index 930fd929e93a..8c5e7f858be3 100644
--- a/drivers/gpu/drm/amd/display/dc/dce/dmub_abm.c
+++ b/drivers/gpu/drm/amd/display/dc/dce/dmub_abm.c
@@ -64,11 +64,15 @@ static void dmub_abm_init_ex(struct abm *abm, uint32_t backlight)
 
 static unsigned int dmub_abm_get_current_backlight_ex(struct abm *abm)
 {
+	dc_allow_idle_optimizations(abm->ctx->dc, false);
+
 	return dmub_abm_get_current_backlight(abm);
 }
 
 static unsigned int dmub_abm_get_target_backlight_ex(struct abm *abm)
 {
+	dc_allow_idle_optimizations(abm->ctx->dc, false);
+
 	return dmub_abm_get_target_backlight(abm);
 }
 
-- 
2.39.2