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drm/amd/display: write segment pointer with mot enabled for mst

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[Why]
Some mst branches NAK's segment pointer writes with mot disabled.
So reset of segment pointer to 0 should be performed with mot enabled.

[How]
Write segment pointer of mst branch devices with mot enabled.

Reviewed-by: Cruise Hung <cruise.hung@amd.com>
Signed-off-by: Meenakshikumar Somasundaram <meenakshikumar.somasundaram@amd.com>
Signed-off-by: Tom Chung <chiahsuan.chung@amd.com>
Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Meenakshikumar Somasundaram
2025-10-08 13:35:07 -04:00
committed by Alex Deucher
parent 1319fb80b3
commit a1362c4052
2 changed files with 6 additions and 3 deletions
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3
drivers/gpu/drm/amd/display/dc/link/link_factory.c
View File

@@ -817,9 +817,6 @@ static bool construct_dpia(struct dc_link *link,
link->psr_settings.psr_version = DC_PSR_VERSION_UNSUPPORTED;
/* Some docks seem to NAK I2C writes to segment pointer with mot=0. */
link->wa_flags.dp_mot_reset_segment = true;
return true;
ddc_create_fail:

6
drivers/gpu/drm/amd/display/dc/link/protocols/link_dp_capability.c
View File

@@ -1867,6 +1867,12 @@ static bool retrieve_link_cap(struct dc_link *link)
link->dpcd_caps.is_mst_capable = read_is_mst_supported(link);
DC_LOG_DC("%s: MST_Support: %s\n", __func__, str_yes_no(link->dpcd_caps.is_mst_capable));
/* Some MST docks seem to NAK I2C writes to segment pointer with mot=0. */
if (link->dpcd_caps.is_mst_capable)
link->wa_flags.dp_mot_reset_segment = true;
else
link->wa_flags.dp_mot_reset_segment = false;
get_active_converter_info(ds_port.byte, link);
dp_wa_power_up_0010FA(link, dpcd_data, sizeof(dpcd_data));