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drm/amd/display: TMDS Fallback transition

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[Why]
HDMI requires fallback to TMDS by redetection
in order to switch PHY settings.
This avoids black out when link training fail
during mode setting, link quality update,
disable driver sequence.

[How]
Allow driver to redetect HDMI displays
based on retraining or fallback mechanism.

Signed-off-by: Chris Park <Chris.Park@amd.com>
Reviewed-by: Aric Cyr <Aric.Cyr@amd.com>
Acked-by: Qingqing Zhuo <qingqing.zhuo@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Chris Park 2020-09-12 13:06:59 -04:00 committed by Alex Deucher
parent 99d1437aa0
commit fb0fe92046
2 changed files with 15 additions and 0 deletions
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13
drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_mst_types.c
View File

@ -159,7 +159,20 @@ static bool validate_dsc_caps_on_connector(struct amdgpu_dm_connector *aconnecto
u8 dsc_caps[16] = { 0 };
aconnector->dsc_aux = drm_dp_mst_dsc_aux_for_port(port);
#if defined(CONFIG_HP_HOOK_WORKAROUND)
/*
* drm_dp_mst_dsc_aux_for_port() will return NULL for certain configs
* because it only check the dsc/fec caps of the "port variable" and not the dock
*
* This case will return NULL: DSC capabe MST dock connected to a non fec/dsc capable display
*
* Workaround: explicitly check the use case above and use the mst dock's aux as dsc_aux
*
*/
if (!aconnector->dsc_aux && !port->parent->port_parent)
aconnector->dsc_aux = &aconnector->mst_port->dm_dp_aux.aux;
#endif
if (!aconnector->dsc_aux)
return false;

2
drivers/gpu/drm/amd/display/dc/dc_link.h
View File

@ -237,6 +237,8 @@ enum dc_detect_reason {
DETECT_REASON_BOOT,
DETECT_REASON_HPD,
DETECT_REASON_HPDRX,
DETECT_REASON_FALLBACK,
DETECT_REASON_RETRAIN
};
bool dc_link_detect(struct dc_link *dc_link, enum dc_detect_reason reason);