From 88eac241a1fc500ce5274a09ddc4bd5fc2b5adb6 Mon Sep 17 00:00:00 2001
From: Anthony Koo <anthony.koo@amd.com>
Date: Wed, 12 Jun 2019 16:30:15 -0400
Subject: drm/amd/display: add monitor patch to add T7 delay
Git-commit: 88eac241a1fc500ce5274a09ddc4bd5fc2b5adb6
Patch-mainline: v5.4-rc1
References: bsc#1152489

[Why]
Specifically to one panel,
TCON is able to accept active video signal quickly, but
the Source Driver requires 2-3 frames of extra time.

It is a Panel issue since TCON needs to take care of
all Sink requirements including Source Driver. But in
this case it does not.

Customer is asking to add fixed T7 delay as panel
workaround.

[How]
Add monitor specific patch to add T7 delay

Signed-off-by: Anthony Koo <anthony.koo@amd.com>
Reviewed-by: Charlene Liu <Charlene.Liu@amd.com>
Acked-by: Leo Li <sunpeng.li@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Acked-by: Thomas Zimmermann <tzimmermann@suse.de>
---
 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 46257f0fcbe7..878f47b59d5a 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
@@ -162,6 +162,10 @@ bool edp_receiver_ready_T7(struct dc_link *link)
 			break;
 		udelay(25); //MAx T7 is 50ms
 	} while (++tries < 300);
+
+	if (link->local_sink->edid_caps.panel_patch.extra_t7_ms > 0)
+		udelay(link->local_sink->edid_caps.panel_patch.extra_t7_ms * 1000);
+
 	return result;
 }
 
diff --git a/drivers/gpu/drm/amd/display/dc/dc_types.h b/drivers/gpu/drm/amd/display/dc/dc_types.h
index 6eabb6491a3d..ce6d73d21cca 100644
--- a/drivers/gpu/drm/amd/display/dc/dc_types.h
+++ b/drivers/gpu/drm/amd/display/dc/dc_types.h
@@ -202,6 +202,7 @@ struct dc_panel_patch {
 	unsigned int dppowerup_delay;
 	unsigned int extra_t12_ms;
 	unsigned int extra_delay_backlight_off;
+	unsigned int extra_t7_ms;
 };
 
 struct dc_edid_caps {
-- 
2.28.0