[PATCH 07/35] drm/amd/display: Add monitor patch for backlight

[Bhawanpreet Lakha]

From: Xiaodong Yan <Xiaodong.Yan at amd.com>

off

[Why]
Different panel need different time from backlight disable to end of valid video data,
if the time is too short, panel will flash when dpms off

[How]
Add monitor patch to control the time from backlight disable to end of valid video data,

Change-Id: Iac651aa22197bce98b1c7c8537333891b87d474e
Signed-off-by: Xiaodong Yan <Xiaodong.Yan at amd.com>
Reviewed-by: Wenjing Liu <Wenjing.Liu at amd.com>
Acked-by: Bhawanpreet Lakha <Bhawanpreet.Lakha at amd.com>
---
 drivers/gpu/drm/amd/display/dc/core/dc_link_hwss.c | 4 ++++
 drivers/gpu/drm/amd/display/dc/dc_types.h          | 1 +
 2 files changed, 5 insertions(+)

diff --git a/drivers/gpu/drm/amd/display/dc/core/dc_link_hwss.c b/drivers/gpu/drm/amd/display/dc/core/dc_link_hwss.c
index 16d441d3af8a..f7f7515f65f4 100644
--- a/drivers/gpu/drm/amd/display/dc/core/dc_link_hwss.c
+++ b/drivers/gpu/drm/amd/display/dc/core/dc_link_hwss.c
@@ -119,6 +119,10 @@ bool edp_receiver_ready_T9(struct dc_link *link)
 			break;
 		udelay(100); //MAx T9
 	} while (++tries < 50);
+
+	if (link->local_sink->edid_caps.panel_patch.extra_delay_backlight_off > 0)
+		udelay(link->local_sink->edid_caps.panel_patch.extra_delay_backlight_off * 1000);
+
 	return result;
 }
 bool edp_receiver_ready_T7(struct dc_link *link)
diff --git a/drivers/gpu/drm/amd/display/dc/dc_types.h b/drivers/gpu/drm/amd/display/dc/dc_types.h
index 56e7f3dab15a..da2009a108cf 100644
--- a/drivers/gpu/drm/amd/display/dc/dc_types.h
+++ b/drivers/gpu/drm/amd/display/dc/dc_types.h
@@ -201,6 +201,7 @@ union display_content_support {
 struct dc_panel_patch {
 	unsigned int dppowerup_delay;
 	unsigned int extra_t12_ms;
+	unsigned int extra_delay_backlight_off;
 };
 
 struct dc_edid_caps {
-- 
2.17.1