drm/i915/mst: Use MST sideband message transactions for dpms control

Use the POWER_DOWN_PHY and POWER_UP_PHY sideband message transactions to
set power states for downstream sinks. Apart from giving us the ability
to set power state for individual sinks, this fixes the below test for
me.

$ xrandr --display :0 --output DP-2-2-8 --off
$ xrandr --display :0 --output DP-2-2-1 --off
$ xrandr --display :0 --output DP-2-2-8 --auto #Black screen
$ xrandr --display :0 --output DP-2-2-1 --auto

v2: Modify and document the dpms and port disable order (Ville)
    Add comment explaining is_mst = !crtc_state equivalence(Ville, Maarten)

v3 by Jani: rebase

References: https://bugs.freedesktop.org/show_bug.cgi?id=90963
References: https://bugs.freedesktop.org/show_bug.cgi?id=88124
Cc: Ville Syrjälä <ville.syrjala@linux.intel.com>
Cc: Lyude <lyude@redhat.com>
Cc: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Reviewed-by: Lyude Paul <lyude@redhat.com>
Acked-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Signed-off-by: Dhinakaran Pandiyan <dhinakaran.pandiyan@intel.com>
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20171003142211.860-1-jani.nikula@intel.com

1 files changed, 8 insertions, 2 deletions

diff --git a/drivers/gpu/drm/i915/intel_dp_mst.c b/drivers/gpu/drm/i915/intel_dp_mst.c
index 9a396f483f8b..3c131e2544cf 100644
--- a/drivers/gpu/drm/i915/intel_dp_mst.c
+++ b/drivers/gpu/drm/i915/intel_dp_mst.c
@@ -162,14 +162,19 @@ static void intel_mst_post_disable_dp(struct intel_encoder *encoder,
 
         drm_dp_mst_deallocate_vcpi(&intel_dp->mst_mgr, connector->port);
 
+        /*
+         * Power down mst path before disabling the port, otherwise we end
+         * up getting interrupts from the sink upon detecting link loss.
+         */
+        drm_dp_send_power_updown_phy(&intel_dp->mst_mgr, connector->port,
+                                     false);
+
         intel_dp->active_mst_links--;
 
         intel_mst->connector = NULL;
         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_DEBUG_KMS("active links %d\n", intel_dp->active_mst_links);
 }
@@ -196,6 +201,7 @@ static void intel_mst_pre_enable_dp(struct intel_encoder *encoder,
 
         DRM_DEBUG_KMS("active links %d\n", intel_dp->active_mst_links);
 
+        drm_dp_send_power_updown_phy(&intel_dp->mst_mgr, connector->port, true);
         if (intel_dp->active_mst_links == 0)
                 intel_dig_port->base.pre_enable(&intel_dig_port->base,
                                                 pipe_config, NULL);