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drm/amd/display: Don't try AUX transactions on disconnected link

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[ 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.liu@amd.com>
Signed-off-by: Ilya Bakoulin <Ilya.Bakoulin@amd.com>
Signed-off-by: Aurabindo Pillai <aurabindo.pillai@amd.com>
Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Ilya Bakoulin
2025-01-28 13:14:54 -05:00
committed by Greg Kroah-Hartman
parent ab83ed96f7
commit 6881a3a588
1 changed files with 5 additions and 3 deletions
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8
drivers/gpu/drm/amd/display/dc/link/protocols/link_dp_phy.c
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@@ -74,7 +74,8 @@ 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);
@@ -159,8 +160,9 @@ 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;