Commit 5b25e5f1 authored Jun 04, 2019 by Harmanprit Tatla Committed by Alex Deucher Jul 18, 2019

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>

parent db31af12

drivers/gpu/drm/amd/display/dc/core/dc_link_dp.c

+8 −1

Original line number	Diff line number	Diff line
		@@ -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 */
		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:

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