drm/i915/skl: Apply eDP WA only for gen < 9

The eDP WA to stop link train based on port type is for HSW/BDW, not
required for SKL+.
Suggested by Satheesh

v2: Simplified the check befoe stop_link_train. Suggested by Satheesh.

v3: stop_link_train need not be called from intel_enable_ddi for gen >= 9

Suggested-by: Satheeshakrishna M <satheeshakrishna.m@intel.com>
Reviewed-by: Paulo Zanoni <paulo.r.zanoni@intel.com>
Reviewed-by: Satheeshakrishna M <satheeshakrishna.m@intel.com>
Signed-off-by: Vandana Kannan <vandana.kannan@intel.com>
Cc: Satheeshakrishna M <satheeshakrishna.m@intel.com>
Signed-off-by: Damien Lespiau <damien.lespiau@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

diff --git a/drivers/gpu/drm/i915/intel_ddi.c b/drivers/gpu/drm/i915/intel_ddi.c
index df4b608..17bf911 100644 (file)
--- a/drivers/gpu/drm/i915/intel_ddi.c
+++ b/drivers/gpu/drm/i915/intel_ddi.c
@@ -1503,7 +1503,7 @@ static void intel_ddi_pre_enable(struct intel_encoder *intel_encoder)
                intel_dp_sink_dpms(intel_dp, DRM_MODE_DPMS_ON);
                intel_dp_start_link_train(intel_dp);
                intel_dp_complete_link_train(intel_dp);
-               if (port != PORT_A)
+               if (port != PORT_A || INTEL_INFO(dev)->gen >= 9)
                        intel_dp_stop_link_train(intel_dp);
        } else if (type == INTEL_OUTPUT_HDMI) {
                struct intel_hdmi *intel_hdmi = enc_to_intel_hdmi(encoder);
@@ -1577,7 +1577,7 @@ static void intel_enable_ddi(struct intel_encoder *intel_encoder)
        } else if (type == INTEL_OUTPUT_EDP) {
                struct intel_dp *intel_dp = enc_to_intel_dp(encoder);
 
-               if (port == PORT_A)
+               if (port == PORT_A && INTEL_INFO(dev)->gen < 9)
                        intel_dp_stop_link_train(intel_dp);
 
                intel_edp_backlight_on(intel_dp);