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drm/amd/display: No audio endpoint for Dell MST display 

[Why]
There are certain MST displays (i.e. Dell P2715Q)
that although have the MST feature set to off may still
report it is a branch device and a non-zero
value for downstream port present.
This can lead to us incorrectly classifying a
dp dongle connection as being active and
disabling the audio endpoint for the display.

[How]
Modified the placement and
condition used to assign
the is_branch_dev bit.

Signed-off-by: Harmanprit Tatla <harmanprit.tatla@amd.com>
Reviewed-by: Aric Cyr <aric.cyr@amd.com>
Acked-by: Anthony Koo <Anthony.Koo@amd.com>
Acked-by: Leo Li <sunpeng.li@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Harmanprit Tatla 2019-06-04 14:12:21 -04:00 committed by Alex Deucher
parent db31af12a5
commit 5b25e5f1a9
1 changed files with 8 additions and 1 deletions
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9
drivers/gpu/drm/amd/display/dc/core/dc_link_dp.c
View File

@ -2230,11 +2230,18 @@ static void get_active_converter_info(
link->dpcd_caps.dongle_type = DISPLAY_DONGLE_NONE;
ddc_service_set_dongle_type(link->ddc,
link->dpcd_caps.dongle_type);
link->dpcd_caps.is_branch_dev = false;
return;
}
/* DPCD 0x5 bit 0 = 1, it indicate it's branch device */
link->dpcd_caps.is_branch_dev = ds_port.fields.PORT_PRESENT;
if (ds_port.fields.PORT_TYPE == DOWNSTREAM_DP) {
link->dpcd_caps.is_branch_dev = false;
}
else {
link->dpcd_caps.is_branch_dev = ds_port.fields.PORT_PRESENT;
}
switch (ds_port.fields.PORT_TYPE) {
case DOWNSTREAM_VGA: