drm/i915: Remove duplicate DDI enabling logic from MST path

The logic to enable a DDI in intel_mst_pre_enable_dp() is essentially
the same as in intel_ddi_pre_enable_dp(). So reuse the latter function
by calling the post_disable hook on the intel_dig_port instead of
duplicating that code.

v2: Don't oops because of a NULL encoder->crtc. (Ville)
v3: Warn for MST + PORT_E too. (Ville)
Cc: Imre Deak <imre.deak@intel.com>
Cc: Ville Syrjälä <ville.syrjala@linux.intel.com>
Signed-off-by: Ander Conselvan de Oliveira <ander.conselvan.de.oliveira@intel.com>
Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/20170302125857.14665-8-ander.conselvan.de.oliveira@intel.com

1 files changed, 3 insertions, 20 deletions

diff --git a/drivers/gpu/drm/i915/intel_dp_mst.c b/drivers/gpu/drm/i915/intel_dp_mst.c
index a8334e18c4fc..094cbdcbcd6d 100644
--- a/drivers/gpu/drm/i915/intel_dp_mst.c
+++ b/drivers/gpu/drm/i915/intel_dp_mst.c
@@ -159,26 +159,9 @@ static void intel_mst_pre_enable_dp(struct intel_encoder *encoder,
 
         DRM_DEBUG_KMS("%d\n", intel_dp->active_mst_links);
 
-        if (intel_dp->active_mst_links == 0) {
-                intel_ddi_clk_select(&intel_dig_port->base,
-                                     pipe_config->shared_dpll);
-
-                intel_display_power_get(dev_priv,
-                                        intel_dig_port->ddi_io_power_domain);
-
-                intel_prepare_dp_ddi_buffers(&intel_dig_port->base);
-                intel_dp_set_link_params(intel_dp,
-                                         pipe_config->port_clock,
-                                         pipe_config->lane_count,
-                                         true);
-
-                intel_ddi_init_dp_buf_reg(&intel_dig_port->base);
-
-                intel_dp_sink_dpms(intel_dp, DRM_MODE_DPMS_ON);
-
-                intel_dp_start_link_train(intel_dp);
-                intel_dp_stop_link_train(intel_dp);
-        }
+        if (intel_dp->active_mst_links == 0)
+                intel_dig_port->base.pre_enable(&intel_dig_port->base,
+                                                pipe_config, NULL);
 
         ret = drm_dp_mst_allocate_vcpi(&intel_dp->mst_mgr,
                                        connector->port,