drm/i915/dp: promote clock recovery failures to DRM_ERROR

If channel equalization succeeds, there's no indication something went
wrong in clock recovery (unless debug is enabled). We should shout about
the failures and fix them instead of hiding them under the carpet.

This has allowed bugs like [1] stay dormant for a long time.

[1] https://bugs.freedesktop.org/show_bug.cgi?id=70117

Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c
index d9090d0340c7a8d87282593506d2067ba98f15dd..377014783e74bae479c0172bc175de2c966b88b2 100644 (file)
--- a/drivers/gpu/drm/i915/intel_dp.c
+++ b/drivers/gpu/drm/i915/intel_dp.c
@@ -2507,7 +2507,7 @@ intel_dp_start_link_train(struct intel_dp *intel_dp)
                if (i == intel_dp->lane_count) {
                        ++loop_tries;
                        if (loop_tries == 5) {
-                               DRM_DEBUG_KMS("too many full retries, give up\n");
+                               DRM_ERROR("too many full retries, give up\n");
                                break;
                        }
                        intel_dp_reset_link_train(intel_dp, &DP,
@@ -2521,7 +2521,7 @@ intel_dp_start_link_train(struct intel_dp *intel_dp)
                if ((intel_dp->train_set[0] & DP_TRAIN_VOLTAGE_SWING_MASK) == voltage) {
                        ++voltage_tries;
                        if (voltage_tries == 5) {
-                               DRM_DEBUG_KMS("too many voltage retries, give up\n");
+                               DRM_ERROR("too many voltage retries, give up\n");
                                break;
                        }
                } else