Commit c5bc8c1b authored by Wesley Chalmers's avatar Wesley Chalmers Committed by Alex Deucher
Browse files

drm/amd/display: Read LTTPR caps first on bootup 



[WHY]
SCR for DP 2.0 requires that LTTPR caps be read first on hotplug.
For the sake of consistency, this should also be the case on bootup.

Signed-off-by: default avatarWesley Chalmers <Wesley.Chalmers@amd.com>
Reviewed-by: default avatarJun Lei <Jun.Lei@amd.com>
Acked-by: default avatarAnson Jacob <Anson.Jacob@amd.com>
Tested-by: default avatarDaniel Wheeler <daniel.wheeler@amd.com>
Signed-off-by: default avatarAlex Deucher <alexander.deucher@amd.com>
parent ee9b1992

drivers/gpu/drm/amd/display/dc/dcn10/dcn10_hw_sequencer.c

+4 −0
Original line number Diff line number Diff line
@@ -54,6 +54,7 @@ 
#include "dce/dmub_hw_lock_mgr.h"

#include "dc_trace.h"

#include "dce/dmub_outbox.h"

#include "inc/dc_link_dp.h"



#define DC_LOGGER_INIT(logger)
@@ -1403,6 +1404,9 @@ void dcn10_init_hw(struct dc *dc) 
			if (dc->links[i]->connector_signal != SIGNAL_TYPE_DISPLAY_PORT)

				continue;



			/* DP 2.0 requires that LTTPR Caps be read first */

			dp_retrieve_lttpr_cap(dc->links[i]);



			/*

			 * If any of the displays are lit up turn them off.

			 * The reason is that some MST hubs cannot be turned off

drivers/gpu/drm/amd/display/dc/dcn30/dcn30_hwseq.c

+3 −0
Original line number Diff line number Diff line
@@ -48,6 +48,7 @@ 
#include "dc_dmub_srv.h"

#include "link_hwss.h"

#include "dpcd_defs.h"

#include "inc/dc_link_dp.h"
@@ -529,6 +530,8 @@ void dcn30_init_hw(struct dc *dc) 
		for (i = 0; i < dc->link_count; i++) {

			if (dc->links[i]->connector_signal != SIGNAL_TYPE_DISPLAY_PORT)

				continue;

			/* DP 2.0 states that LTTPR regs must be read first */

			dp_retrieve_lttpr_cap(dc->links[i]);



			/* if any of the displays are lit up turn them off */

			status = core_link_read_dpcd(dc->links[i], DP_SET_POWER,

drivers/gpu/drm/amd/display/dc/inc/dc_link_dp.h

+1 −0
Original line number Diff line number Diff line
@@ -190,4 +190,5 @@ enum dc_status dpcd_configure_lttpr_mode( 
		struct link_training_settings *lt_settings);



enum dp_link_encoding dp_get_link_encoding_format(const struct dc_link_settings *link_settings);

bool dp_retrieve_lttpr_cap(struct dc_link *link);

#endif /* __DC_LINK_DP_H__ */