diff options
| -rw-r--r-- | drivers/gpu/drm/i915/display/intel_dp_link_training.c | 9 |
1 files changed, 9 insertions, 0 deletions
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 2493142a70e9..a23ed7290843 100644 --- a/drivers/gpu/drm/i915/display/intel_dp_link_training.c +++ b/drivers/gpu/drm/i915/display/intel_dp_link_training.c @@ -52,6 +52,7 @@ static u8 dp_voltage_max(u8 preemph) void intel_dp_get_adjust_train(struct intel_dp *intel_dp, const u8 link_status[DP_LINK_STATUS_SIZE]) { + struct drm_i915_private *i915 = dp_to_i915(intel_dp); u8 v = 0; u8 p = 0; int lane; @@ -64,12 +65,20 @@ void intel_dp_get_adjust_train(struct intel_dp *intel_dp, } preemph_max = intel_dp->preemph_max(intel_dp); + drm_WARN_ON_ONCE(&i915->drm, + preemph_max != DP_TRAIN_PRE_EMPH_LEVEL_2 && + preemph_max != DP_TRAIN_PRE_EMPH_LEVEL_3); + if (p >= preemph_max) p = preemph_max | DP_TRAIN_MAX_PRE_EMPHASIS_REACHED; v = min(v, dp_voltage_max(p)); voltage_max = intel_dp->voltage_max(intel_dp); + drm_WARN_ON_ONCE(&i915->drm, + voltage_max != DP_TRAIN_VOLTAGE_SWING_LEVEL_2 && + voltage_max != DP_TRAIN_VOLTAGE_SWING_LEVEL_3); + if (v >= voltage_max) v = voltage_max | DP_TRAIN_MAX_SWING_REACHED; |