From: Joseph Gravenor <joseph.gravenor@xxxxxxx>
[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@xxxxxxx>
Reviewed-by: Eric Yang <eric.yang2@xxxxxxx>
Acked-by: Bhawanpreet Lakha <Bhawanpreet.Lakha@xxxxxxx>
---
.../amd/display/dc/dcn10/dcn10_hw_sequencer.c | 22 +++++++++++++++++--
1 file changed, 20 insertions(+), 2 deletions(-)
diff --git a/drivers/gpu/drm/amd/display/dc/dcn10/dcn10_hw_sequencer.c b/drivers/gpu/drm/amd/display/dc/dcn10/dcn10_hw_sequencer.c
index 0225f8d8bb82..42fcfee2c31b 100644
--- a/drivers/gpu/drm/amd/display/dc/dcn10/dcn10_hw_sequencer.c
+++ b/drivers/gpu/drm/amd/display/dc/dcn10/dcn10_hw_sequencer.c
@@ -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.
--
2.17.1
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