[PATCH 08/18] drm/amd/display: change hw sequence

[Rodrigo Siqueira]

From: Sherry <Yao.Wang1 at amd.com>

[Why]
t9 delay func is called twice after setting power off, the unexpected
action results in a doubling of the added 140ms t9 delay

[How]
If the backlight has been turned off, does not turn it off again

Signed-off-by: Sherry <Yao.Wang1 at amd.com>
Reviewed-by: Tony Cheng <Tony.Cheng at amd.com>
Acked-by: Rodrigo Siqueira <Rodrigo.Siqueira at amd.com>
---
 .../drm/amd/display/dc/dce110/dce110_hw_sequencer.c | 13 ++++++++-----
 1 file changed, 8 insertions(+), 5 deletions(-)

diff --git a/drivers/gpu/drm/amd/display/dc/dce110/dce110_hw_sequencer.c b/drivers/gpu/drm/amd/display/dc/dce110/dce110_hw_sequencer.c
index 9f56887029ca..90c85b3e859b 100644
--- a/drivers/gpu/drm/amd/display/dc/dce110/dce110_hw_sequencer.c
+++ b/drivers/gpu/drm/amd/display/dc/dce110/dce110_hw_sequencer.c
@@ -939,12 +939,15 @@ void dce110_edp_backlight_control(
 		return;
 	}
 
-	if (enable && link->panel_cntl &&
-		link->panel_cntl->funcs->is_panel_backlight_on(link->panel_cntl)) {
-		DC_LOG_HW_RESUME_S3(
-				"%s: panel already powered up. Do nothing.\n",
+	if (link->panel_cntl) {
+		bool is_backlight_on = link->panel_cntl->funcs->is_panel_backlight_on(link->panel_cntl);
+
+		if ((enable && is_backlight_on) || (!enable && !is_backlight_on)) {
+			DC_LOG_HW_RESUME_S3(
+				"%s: panel already powered up/off. Do nothing.\n",
 				__func__);
-		return;
+			return;
+		}
 	}
 
 	/* Send VBIOS command to control eDP panel backlight */
-- 
2.29.2