[PATCH 38/46] drm/amd/display: Fix FEC_READY write on DP LT

[Wayne Lin]

From: Ilya Bakoulin <ilya.bakoulin at amd.com>

[Why/How]
We can miss writing FEC_READY in some cases before LT start, which
violates DP spec. Remove the condition guarding the DPCD write so that
the write happens unconditionally.

Cc: Mario Limonciello <mario.limonciello at amd.com>
Cc: Alex Deucher <alexander.deucher at amd.com>
Cc: stable at vger.kernel.org
Reviewed-by: Wenjing Liu <wenjing.liu at amd.com>
Acked-by: Wayne Lin <wayne.lin at amd.com>
Signed-off-by: Ilya Bakoulin <ilya.bakoulin at amd.com>
---
 .../amd/display/dc/link/protocols/link_dp_phy.c    | 14 ++++++--------
 1 file changed, 6 insertions(+), 8 deletions(-)

diff --git a/drivers/gpu/drm/amd/display/dc/link/protocols/link_dp_phy.c b/drivers/gpu/drm/amd/display/dc/link/protocols/link_dp_phy.c
index 5cbf5f93e584..bafa52a0165a 100644
--- a/drivers/gpu/drm/amd/display/dc/link/protocols/link_dp_phy.c
+++ b/drivers/gpu/drm/amd/display/dc/link/protocols/link_dp_phy.c
@@ -151,16 +151,14 @@ enum dc_status dp_set_fec_ready(struct dc_link *link, const struct link_resource
 		return DC_NOT_SUPPORTED;
 
 	if (ready && dp_should_enable_fec(link)) {
-		if (link->fec_state == dc_link_fec_not_ready) {
-			fec_config = 1;
+		fec_config = 1;
 
-			status = core_link_write_dpcd(link, DP_FEC_CONFIGURATION,
-					&fec_config, sizeof(fec_config));
+		status = core_link_write_dpcd(link, DP_FEC_CONFIGURATION,
+				&fec_config, sizeof(fec_config));
 
-			if (status == DC_OK) {
-				link_enc->funcs->fec_set_ready(link_enc, true);
-				link->fec_state = dc_link_fec_ready;
-			}
+		if (status == DC_OK) {
+			link_enc->funcs->fec_set_ready(link_enc, true);
+			link->fec_state = dc_link_fec_ready;
 		}
 	} else {
 		if (link->fec_state == dc_link_fec_ready) {
-- 
2.37.3