From: Ilya Bakoulin <ilya.bakou...@amd.com>
[ Upstream commit e8bffa52e0253cfd689813a620e64521256bc712 ]
[Why]
Setting link DPMS off in response to HPD disconnect creates AUX
transactions on a link that is supposed to be disconnected. This can
cause issues in some cases when the sink re-asserts HPD and expects
source to re-enable the link.
[How]
Avoid AUX transactions on disconnected link.
Reviewed-by: Wenjing Liu <wenjing....@amd.com>
Signed-off-by: Ilya Bakoulin <ilya.bakou...@amd.com>
Signed-off-by: Aurabindo Pillai <aurabindo.pil...@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>
---
.../gpu/drm/amd/display/dc/link/protocols/link_dp_phy.c | 8 +++++---
1 file changed, 5 insertions(+), 3 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 bafa52a0165a0..17c57cf98ec5c 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
@@ -75,7 +75,8 @@ void dp_disable_link_phy(struct dc_link *link,
struct dc *dc = link->ctx->dc;
if (!link->wa_flags.dp_keep_receiver_powered &&
- !link->skip_implict_edp_power_control)
+ !link->skip_implict_edp_power_control &&
+ link->type != dc_connection_none)
dpcd_write_rx_power_ctrl(link, false);
dc->hwss.disable_link_output(link, link_res, signal);
@@ -163,8 +164,9 @@ enum dc_status dp_set_fec_ready(struct dc_link *link, const
struct link_resource
} else {
if (link->fec_state == dc_link_fec_ready) {
fec_config = 0;
- core_link_write_dpcd(link, DP_FEC_CONFIGURATION,
- &fec_config, sizeof(fec_config));
+ if (link->type != dc_connection_none)
+ core_link_write_dpcd(link, DP_FEC_CONFIGURATION,
+ &fec_config, sizeof(fec_config));
link_enc->funcs->fec_set_ready(link_enc, false);
link->fec_state = dc_link_fec_not_ready;
--
2.39.5
