Don't use DP link training optimization if channel EQ is not ok. It has been reported that in case of failure in channel EQ check the link training optimization can be enabled and therefore may not be able to reuse the previously computed drive current and pre-emphasis levels.
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=91393 Signed-off-by: Mika Kahola <[email protected]> --- drivers/gpu/drm/i915/intel_dp.c | 1 + 1 file changed, 1 insertion(+) diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c index 3137187..0cd1ccb 100644 --- a/drivers/gpu/drm/i915/intel_dp.c +++ b/drivers/gpu/drm/i915/intel_dp.c @@ -4354,6 +4354,7 @@ intel_dp_check_link_status(struct intel_dp *intel_dp) (!drm_dp_channel_eq_ok(link_status, intel_dp->lane_count))) { DRM_DEBUG_KMS("%s: channel EQ not ok, retraining\n", intel_encoder->base.name); + intel_dp->train_set_valid = false; intel_dp_start_link_train(intel_dp); intel_dp_stop_link_train(intel_dp); } -- 1.9.1 _______________________________________________ Intel-gfx mailing list [email protected] http://lists.freedesktop.org/mailman/listinfo/intel-gfx
