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drm/amd/display: Retrieve MST Downstream Port Status

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Determine if DFP present and the type of downstream device
based on dsc_aux

Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Reviewed-by: Hersen Wu <hersenxs.wu@amd.com>
Acked-by: Rodrigo Siqueira <Rodrigo.Siqueira@amd.com>
Signed-off-by: Fangzhi Zuo <Jerry.Zuo@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Fangzhi Zuo 2022-01-23 13:20:07 -05:00 committed by Alex Deucher
parent 2ca97adccd
commit 09db246cee
2 changed files with 24 additions and 0 deletions
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1
drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.h
View File

@ -604,6 +604,7 @@ struct amdgpu_dm_connector {
#endif
bool force_yuv420_output;
struct dsc_preferred_settings dsc_settings;
union dp_downstream_port_present mst_downstream_port_present;
/* Cached display modes */
struct drm_display_mode freesync_vid_base;

23
drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_mst_types.c
View File

@ -209,6 +209,25 @@ static bool validate_dsc_caps_on_connector(struct amdgpu_dm_connector *aconnecto
return true;
}
bool retrieve_downstream_port_device(struct amdgpu_dm_connector *aconnector)
{
union dp_downstream_port_present ds_port_present;
if (!aconnector->dsc_aux)
return false;
if (drm_dp_dpcd_read(aconnector->dsc_aux, DP_DOWNSTREAMPORT_PRESENT, &ds_port_present, 1) < 0) {
DRM_INFO("Failed to read downstream_port_present 0x05 from DFP of branch device\n");
return false;
}
aconnector->mst_downstream_port_present = ds_port_present;
DRM_INFO("Downstream port present %d, type %d\n",
ds_port_present.fields.PORT_PRESENT, ds_port_present.fields.PORT_TYPE);
return true;
}
#endif
static int dm_dp_mst_get_modes(struct drm_connector *connector)
@ -289,6 +308,10 @@ static int dm_dp_mst_get_modes(struct drm_connector *connector)
if (!validate_dsc_caps_on_connector(aconnector))
memset(&aconnector->dc_sink->dsc_caps,
0, sizeof(aconnector->dc_sink->dsc_caps));
if (!retrieve_downstream_port_device(aconnector))
memset(&aconnector->mst_downstream_port_present,
0, sizeof(aconnector->mst_downstream_port_present));
#endif
}
}