[PATCH 2/2] drm/i915/mst: Fix black screen on-boot seen in some MST configurations
Dhinakaran Pandiyan
dhnkrn at gmail.com
Fri Sep 1 19:12:26 UTC 2017
Use the POWER_DOWN_PHY and POWER_UP_PHY sideband message trasactions to
set power states for downstream sinks. This fixes the black screen at
boot in a configuration involving Dell monitor + dock.
Signed-off-by: Dhinakaran Pandiyan <dhinakaran.pandiyan at intel.com>
---
drivers/gpu/drm/i915/intel_dp_mst.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/drivers/gpu/drm/i915/intel_dp_mst.c b/drivers/gpu/drm/i915/intel_dp_mst.c
index 8e3aad0ea60b..9a9673e9381e 100644
--- a/drivers/gpu/drm/i915/intel_dp_mst.c
+++ b/drivers/gpu/drm/i915/intel_dp_mst.c
@@ -170,9 +170,8 @@ static void intel_mst_post_disable_dp(struct intel_encoder *encoder,
if (intel_dp->active_mst_links == 0) {
intel_dig_port->base.post_disable(&intel_dig_port->base,
NULL, NULL);
-
- intel_dp_sink_dpms(intel_dp, DRM_MODE_DPMS_OFF);
}
+ drm_dp_send_power_updown_phy(&intel_dp->mst_mgr, connector->port, false);
}
static void intel_mst_pre_enable_dp(struct intel_encoder *encoder,
@@ -200,6 +199,7 @@ static void intel_mst_pre_enable_dp(struct intel_encoder *encoder,
if (intel_dp->active_mst_links == 0)
intel_dig_port->base.pre_enable(&intel_dig_port->base,
pipe_config, NULL);
+ drm_dp_send_power_updown_phy(&intel_dp->mst_mgr, connector->port, true);
ret = drm_dp_mst_allocate_vcpi(&intel_dp->mst_mgr,
connector->port,
--
2.11.0
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