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drm/amd/display: Fix FEC_READY write on DP LT

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[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@amd.com>
Cc: Alex Deucher <alexander.deucher@amd.com>
Cc: stable@vger.kernel.org
Reviewed-by: Wenjing Liu <wenjing.liu@amd.com>
Acked-by: Wayne Lin <wayne.lin@amd.com>
Signed-off-by: Ilya Bakoulin <ilya.bakoulin@amd.com>
Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Ilya Bakoulin 2024-04-17 14:21:28 -04:00 committed by Alex Deucher
parent 523ee6f441
commit a8baec4623
1 changed files with 6 additions and 8 deletions
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14
drivers/gpu/drm/amd/display/dc/link/protocols/link_dp_phy.c
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@ -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) {