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drm/amd/display: turn off the mst hub before we do detection

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[why]
not turning off the mst hub before detection on reboot
causes us to not be able to light up displays with mst hook

[how]
on hw init, see if any displays are lit up. if so, turn them off

Signed-off-by: Joseph Gravenor <joseph.gravenor@amd.com>
Reviewed-by: Eric Yang <eric.yang2@amd.com>
Acked-by: Bhawanpreet Lakha <Bhawanpreet.Lakha@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Joseph Gravenor 2020-01-28 10:38:22 -05:00 committed by Alex Deucher
parent 15add0c2fe
commit 896dace8ec
1 changed files with 20 additions and 2 deletions
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22
drivers/gpu/drm/amd/display/dc/dcn10/dcn10_hw_sequencer.c
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@ -48,8 +48,8 @@
#include "dc_link_dp.h"
#include "dccg.h"
#include "clk_mgr.h"
#include "link_hwss.h"
#include "dpcd_defs.h"
#include "dsc.h"
#define DC_LOGGER_INIT(logger)
@ -1322,6 +1322,24 @@ void dcn10_init_hw(struct dc *dc)
if (hws->funcs.dsc_pg_control != NULL)
hws->funcs.dsc_pg_control(hws, res_pool->dscs[i]->inst, false);
/* we want to turn off all dp displays before doing detection */
if (dc->config.power_down_display_on_boot) {
uint8_t dpcd_power_state = '\0';
enum dc_status status = DC_ERROR_UNEXPECTED;
for (i = 0; i < dc->link_count; i++) {
if (dc->links[i]->connector_signal != SIGNAL_TYPE_DISPLAY_PORT) {
continue;
}
/* if any of the displays are lit up turn them off */
status = core_link_read_dpcd(dc->links[i], DP_SET_POWER,
&dpcd_power_state, sizeof(dpcd_power_state));
if (status == DC_OK && dpcd_power_state == DP_POWER_STATE_D0) {
dp_receiver_power_ctrl(dc->links[i], false);
}
}
}
/* If taking control over from VBIOS, we may want to optimize our first
* mode set, so we need to skip powering down pipes until we know which
* pipes we want to use.