Commit fb0fe920 authored by Chris Park's avatar Chris Park Committed by Alex Deucher
Browse files

drm/amd/display: TMDS Fallback transition 



[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: default avatarChris Park <Chris.Park@amd.com>
Reviewed-by: default avatarAric Cyr <Aric.Cyr@amd.com>
Acked-by: default avatarQingqing Zhuo <qingqing.zhuo@amd.com>
Signed-off-by: default avatarAlex Deucher <alexander.deucher@amd.com>
parent 99d1437a

drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_mst_types.c

+13 −0
Original line number Diff line number Diff line
@@ -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;

drivers/gpu/drm/amd/display/dc/dc_link.h

+2 −0
Original line number Diff line number Diff line
@@ -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);