linux-kernel - [PATCH AUTOSEL 5.10 05/30] drm/amd/display: FEC check in timing validation

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Date:   Mon, 11 Apr 2022 20:48:39 -0400
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Chiawen Huang <chiawen.huang@....com>,
        Anthony Koo <Anthony.Koo@....com>,
        Alex Hung <alex.hung@....com>,
        Daniel Wheeler <daniel.wheeler@....com>,
        Alex Deucher <alexander.deucher@....com>,
        Sasha Levin <sashal@...nel.org>, harry.wentland@....com,
        sunpeng.li@....com, Rodrigo.Siqueira@....com,
        christian.koenig@....com, Xinhui.Pan@....com, airlied@...ux.ie,
        daniel@...ll.ch, nicholas.kazlauskas@....com, Wayne.Lin@....com,
        Jun.Lei@....com, meenakshikumar.somasundaram@....com,
        michael.strauss@....com, Martin.Leung@....com,
        Jimmy.Kizito@....com, Eric.Yang2@....com, lee.jones@...aro.org,
        wenjing.liu@....com, roy.chan@....com,
        amd-gfx@...ts.freedesktop.org, dri-devel@...ts.freedesktop.org
Subject: [PATCH AUTOSEL 5.10 05/30] drm/amd/display: FEC check in timing validation

From: Chiawen Huang <chiawen.huang@....com>

[ 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@....com>
Acked-by: Alex Hung <alex.hung@....com>
Signed-off-by: Chiawen Huang <chiawen.huang@....com>
Tested-by: Daniel Wheeler <daniel.wheeler@....com>
Signed-off-by: Alex Deucher <alexander.deucher@....com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/gpu/drm/amd/display/dc/core/dc.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/gpu/drm/amd/display/dc/core/dc.c b/drivers/gpu/drm/amd/display/dc/core/dc.c
index 93f5229c303e..ac5323596c65 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)
-- 
2.35.1