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drm/amd/display: Send DP_TOTAL_LTTPR_CNT during detection if LTTPR is present

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[WHY]
New register field added in DP2.1 SCR, needed for auxless ALPM

[HOW]
Echo value read from 0xF0007 back to sink

Reviewed-by: Wenjing Liu <wenjing.liu@amd.com>
Cc: Mario Limonciello <mario.limonciello@amd.com>
Cc: Alex Deucher <alexander.deucher@amd.com>
Cc: stable@vger.kernel.org
Signed-off-by: Alex Hung <alex.hung@amd.com>
Signed-off-by: Michael Strauss <michael.strauss@amd.com>
Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Michael Strauss
2023-11-28 10:31:12 -05:00
committed by Alex Deucher
parent ee8287e068
commit d03415f60b
2 changed files with 14 additions and 1 deletions
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drivers/gpu/drm/amd/display/dc/link/protocols/link_dp_capability.c
+9 -1
View File
@@ -1605,9 +1605,17 @@ static bool retrieve_link_cap(struct dc_link *link)
return false;
}
if (dp_is_lttpr_present(link))
if (dp_is_lttpr_present(link)) {
configure_lttpr_mode_transparent(link);
// Echo TOTAL_LTTPR_CNT back downstream
core_link_write_dpcd(
link,
DP_TOTAL_LTTPR_CNT,
&link->dpcd_caps.lttpr_caps.phy_repeater_cnt,
sizeof(link->dpcd_caps.lttpr_caps.phy_repeater_cnt));
}
/* Read DP tunneling information. */
status = dpcd_get_tunneling_device_data(link);