[PATCH AUTOSEL 5.17 08/49] drm/amd/display: FEC check in timing validation

[Sasha Levin]

From: Chiawen Huang <chiawen.hu...@amd.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....@amd.com>
Acked-by: Alex Hung <alex.h...@amd.com>
Signed-off-by: Chiawen Huang <chiawen.hu...@amd.com>
Tested-by: Daniel Wheeler <daniel.whee...@amd.com>
Signed-off-by: Alex Deucher <alexander.deuc...@amd.com>
Signed-off-by: Sasha Levin <sas...@kernel.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 ba1aa994db4b..a62711d71d0e 100644
--- a/drivers/gpu/drm/amd/display/dc/core/dc.c
+++ b/drivers/gpu/drm/amd/display/dc/core/dc.c
@@ -1493,6 +1493,10 @@ 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