From: Chiawen Huang <chiawen.huang@amd.com>
Date: Wed, 9 Mar 2022 16:07:59 +0000 (+0800)
Subject: drm/amd/display: FEC check in timing validation
X-Git-Tag: v5.10.112~59
X-Git-Url: https://www.infradead.org/git/?a=commitdiff_plain;h=6906e05cf3ad2cfe704eda003de59aa0cb89b291;p=users%2Fdwmw2%2Flinux.git

drm/amd/display: FEC check in timing validation

[ Upstream commit 7d56a154e22ffb3613fdebf83ec34d5225a22993 ]

[Why]
disable/enable leads FEC mismatch between hw/sw FEC state.

[How]
check FEC status to fastboot on/off.

Reviewed-by: Anthony Koo <Anthony.Koo@amd.com>
Acked-by: Alex Hung <alex.hung@amd.com>
Signed-off-by: Chiawen Huang <chiawen.huang@amd.com>
Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---

diff --git a/drivers/gpu/drm/amd/display/dc/core/dc.c b/drivers/gpu/drm/amd/display/dc/core/dc.c
index 93f5229c303e7..ac5323596c652 100644
--- a/drivers/gpu/drm/amd/display/dc/core/dc.c
+++ b/drivers/gpu/drm/amd/display/dc/core/dc.c
@@ -1173,6 +1173,10 @@ bool dc_validate_seamless_boot_timing(const struct dc *dc,
 	if (!link->link_enc->funcs->is_dig_enabled(link->link_enc))
 		return false;
 
+	/* Check for FEC status*/
+	if (link->link_enc->funcs->fec_is_active(link->link_enc))
+		return false;
+
 	enc_inst = link->link_enc->funcs->get_dig_frontend(link->link_enc);
 
 	if (enc_inst == ENGINE_ID_UNKNOWN)