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drm/amd/display: Prevent dpcd reads with passive dongles

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[ Upstream commit e6142dd511425cb827b5db869f489eb81f5f994d ]

[why]
During hotplug, a DP port may be connected to the sink through
passive adapter which does not support DPCD reads. Issuing reads
without checking for this condition will result in errors

[how]
Ensure the link is in aux_mode before initiating operation that result
in a DPCD read.

Signed-off-by: Aurabindo Pillai <aurabindo.pillai@amd.com>
Reviewed-by: Harry Wentland <Harry.Wentland@amd.com>
Acked-by: Aurabindo Pillai <aurabindo.pillai@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Aurabindo Pillai 2020-04-22 14:37:33 -04:00 • committed by Greg Kroah-Hartman
commit 4f48af8147
1 changed files with 11 additions and 6 deletions
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17
drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
View file

@ -1422,17 +1422,22 @@ amdgpu_dm_update_connector_after_detect(struct amdgpu_dm_connector *aconnector)
dc_sink_retain(aconnector->dc_sink);
if (sink->dc_edid.length == 0) {
aconnector->edid = NULL;
drm_dp_cec_unset_edid(&aconnector->dm_dp_aux.aux);
if (aconnector->dc_link->aux_mode) {
drm_dp_cec_unset_edid(
&aconnector->dm_dp_aux.aux);
}
} else {
aconnector->edid =
(struct edid *) sink->dc_edid.raw_edid;
(struct edid *)sink->dc_edid.raw_edid;
drm_connector_update_edid_property(connector,
aconnector->edid);
drm_dp_cec_set_edid(&aconnector->dm_dp_aux.aux,
aconnector->edid);
aconnector->edid);
if (aconnector->dc_link->aux_mode)
drm_dp_cec_set_edid(&aconnector->dm_dp_aux.aux,
aconnector->edid);
}
amdgpu_dm_update_freesync_caps(connector, aconnector->edid);
} else {