drm/i915/dp_mst: Fix enabling pipe clock for all streams

commit afb2c4437dae ("drm/i915/ddi: Push pipe clock enabling to encoders")
inadvertently stopped enabling the pipe clock for any DP-MST stream
after the first one. It also rearranged the pipe clock enabling wrt.
initial MST payload allocation step (which may or may not be a
problem, but it's contrary to the spec.).

Fix things by making the above commit truly a non-functional change.

Fixes: afb2c4437dae ("drm/i915/ddi: Push pipe clock enabling to encoders")
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=107365
Reported-by: Lyude Paul <lyude@redhat.com>
Reported-by: dmummenschanz@web.de
Tested-by: dmummenschanz@web.de
Tested-by: Lyude Paul <lyude@redhat.com>
Cc: Lyude Paul <lyude@redhat.com>
Cc: dmummenschanz@web.de
Cc: Ville Syrjälä <ville.syrjala@linux.intel.com>
Cc: Rodrigo Vivi <rodrigo.vivi@intel.com>
Cc: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Imre Deak <imre.deak@intel.com>
Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Reviewed-by: Lyude Paul <lyude@redhat.com>
Reviewed-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20180831174739.30387-1-imre.deak@intel.com
(cherry picked from commit 2b5cf4ef541f1b2facaca58cae5e8e0b5f19ad4c)
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>

diff --git a/drivers/gpu/drm/i915/intel_ddi.c b/drivers/gpu/drm/i915/intel_ddi.c
index 8761513..c9af348 100644 (file)
--- a/drivers/gpu/drm/i915/intel_ddi.c
+++ b/drivers/gpu/drm/i915/intel_ddi.c
@@ -2708,7 +2708,8 @@ static void intel_ddi_pre_enable_dp(struct intel_encoder *encoder,
        if (port != PORT_A || INTEL_GEN(dev_priv) >= 9)
                intel_dp_stop_link_train(intel_dp);
 
-       intel_ddi_enable_pipe_clock(crtc_state);
+       if (!is_mst)
+               intel_ddi_enable_pipe_clock(crtc_state);
 }
 
 static void intel_ddi_pre_enable_hdmi(struct intel_encoder *encoder,
@@ -2810,14 +2811,14 @@ static void intel_ddi_post_disable_dp(struct intel_encoder *encoder,
        bool is_mst = intel_crtc_has_type(old_crtc_state,
                                          INTEL_OUTPUT_DP_MST);
 
-       intel_ddi_disable_pipe_clock(old_crtc_state);
-
-       /*
-        * Power down sink before disabling the port, otherwise we end
-        * up getting interrupts from the sink on detecting link loss.
-        */
-       if (!is_mst)
+       if (!is_mst) {
+               intel_ddi_disable_pipe_clock(old_crtc_state);
+               /*
+                * Power down sink before disabling the port, otherwise we end
+                * up getting interrupts from the sink on detecting link loss.
+                */
                intel_dp_sink_dpms(intel_dp, DRM_MODE_DPMS_OFF);
+       }
 
        intel_disable_ddi_buf(encoder);
 

diff --git a/drivers/gpu/drm/i915/intel_dp_mst.c b/drivers/gpu/drm/i915/intel_dp_mst.c
index 7e3e016..4ecd653 100644 (file)
--- a/drivers/gpu/drm/i915/intel_dp_mst.c
+++ b/drivers/gpu/drm/i915/intel_dp_mst.c
@@ -166,6 +166,8 @@ static void intel_mst_post_disable_dp(struct intel_encoder *encoder,
        struct intel_connector *connector =
                to_intel_connector(old_conn_state->connector);
 
+       intel_ddi_disable_pipe_clock(old_crtc_state);
+
        /* this can fail */
        drm_dp_check_act_status(&intel_dp->mst_mgr);
        /* and this can also fail */
@@ -252,6 +254,8 @@ static void intel_mst_pre_enable_dp(struct intel_encoder *encoder,
        I915_WRITE(DP_TP_STATUS(port), temp);
 
        ret = drm_dp_update_payload_part1(&intel_dp->mst_mgr);
+
+       intel_ddi_enable_pipe_clock(pipe_config);
 }
 
 static void intel_mst_enable_dp(struct intel_encoder *encoder,