drm/i915: Call intel_dp_dump_link_status() for CR failures

I suppose intel_dp_dump_link_status() might be useful for diagnosing
link training failures. Hoever we only call from the channel EQ phase
currently. Let's call it from the CR phase as well.

Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20211004170535.4173-6-ville.syrjala@linux.intel.com
Reviewed-by: Imre Deak <imre.deak@intel.com>

diff --git a/drivers/gpu/drm/i915/display/intel_dp_link_training.c b/drivers/gpu/drm/i915/display/intel_dp_link_training.c
index 681c8bc..1a943ae 100644 (file)
--- a/drivers/gpu/drm/i915/display/intel_dp_link_training.c
+++ b/drivers/gpu/drm/i915/display/intel_dp_link_training.c
@@ -649,6 +649,7 @@ intel_dp_link_training_clock_recovery(struct intel_dp *intel_dp,
        struct drm_i915_private *i915 = to_i915(encoder->base.dev);
        u8 old_link_status[DP_LINK_STATUS_SIZE] = {};
        int voltage_tries, cr_tries, max_cr_tries;
+       u8 link_status[DP_LINK_STATUS_SIZE];
        bool max_vswing_reached = false;
        char phy_name[10];
 
@@ -678,8 +679,6 @@ intel_dp_link_training_clock_recovery(struct intel_dp *intel_dp,
 
        voltage_tries = 1;
        for (cr_tries = 0; cr_tries < max_cr_tries; ++cr_tries) {
-               u8 link_status[DP_LINK_STATUS_SIZE];
-
                intel_dp_link_training_clock_recovery_delay(intel_dp, dp_phy);
 
                if (drm_dp_dpcd_read_phy_link_status(&intel_dp->aux, dp_phy,
@@ -697,6 +696,7 @@ intel_dp_link_training_clock_recovery(struct intel_dp *intel_dp,
                }
 
                if (voltage_tries == 5) {
+                       intel_dp_dump_link_status(intel_dp, dp_phy, link_status);
                        drm_dbg_kms(&i915->drm,
                                    "[ENCODER:%d:%s][%s] Same voltage tried 5 times\n",
                                    encoder->base.base.id, encoder->base.name, phy_name);
@@ -704,6 +704,7 @@ intel_dp_link_training_clock_recovery(struct intel_dp *intel_dp,
                }
 
                if (max_vswing_reached) {
+                       intel_dp_dump_link_status(intel_dp, dp_phy, link_status);
                        drm_dbg_kms(&i915->drm,
                                    "[ENCODER:%d:%s][%s] Max Voltage Swing reached\n",
                                    encoder->base.base.id, encoder->base.name, phy_name);
@@ -732,6 +733,7 @@ intel_dp_link_training_clock_recovery(struct intel_dp *intel_dp,
                        max_vswing_reached = true;
        }
 
+       intel_dp_dump_link_status(intel_dp, dp_phy, link_status);
        drm_err(&i915->drm,
                "[ENCODER:%d:%s][%s] Failed clock recovery %d times, giving up!\n",
                encoder->base.base.id, encoder->base.name, phy_name, max_cr_tries);