diff options
| author | Ilya Bakoulin <Ilya.Bakoulin@amd.com> | 2025-01-28 13:14:54 -0500 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2025-05-29 11:02:52 +0200 |
| commit | ed2039d840a12b35e17f9cb1f4a594330c573a0c (patch) | |
| tree | 491010ab26eb259537c1c2177f924c1e909ca6b6 | |
| parent | a8726bee7046dac60399c2ee88e85584b4c9bc7d (diff) | |
drm/amd/display: Don't try AUX transactions on disconnected link
[ 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>
| -rw-r--r-- | drivers/gpu/drm/amd/display/dc/link/protocols/link_dp_phy.c | 8 |
1 files 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 bafa52a0165a..17c57cf98ec5 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; |