From: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx> The DP spec says: "The transmitter shall support at least three levels of voltage swing (Levels 0, 1, and 2). If only three levels of voltage swing are supported (VOLTAGE SWING SET field (bits 1:0) are programmed to 10 (Level 2)), this bit shall be set to 1, and cleared in all other cases. If all four levels of voltage swing are supported (VOLTAGE SWING SET field (bits 1:0) are programmed to 11 (Level 3)), this bit shall be set to 1,and cleared in all other cases." Let's follow that exactly instead of the current apporach where we can set those also for vswing/preemph levels 0 or 1 (or 2 when the platform max is 3). Signed-off-by: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx> --- drivers/gpu/drm/i915/display/intel_dp_link_training.c | 5 +++-- 1 file changed, 3 insertions(+), 2 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 573f93779449..aa7af531bcb8 100644 --- a/drivers/gpu/drm/i915/display/intel_dp_link_training.c +++ b/drivers/gpu/drm/i915/display/intel_dp_link_training.c @@ -72,8 +72,9 @@ void intel_dp_get_adjust_train(struct intel_dp *intel_dp, if (p >= preemph_max) p = preemph_max | DP_TRAIN_MAX_PRE_EMPHASIS_REACHED; - voltage_max = min(intel_dp->voltage_max(intel_dp), - dp_voltage_max(p)); + v = min(v, dp_voltage_max(p)); + + voltage_max = intel_dp->voltage_max(intel_dp); if (v >= voltage_max) v = voltage_max | DP_TRAIN_MAX_SWING_REACHED; -- 2.26.2 _______________________________________________ Intel-gfx mailing list Intel-gfx@xxxxxxxxxxxxxxxxxxxxx https://lists.freedesktop.org/mailman/listinfo/intel-gfx
