On Mon, 2016-01-04 at 18:53 +0200, Ville Syrjälä wrote: > On Mon, Jan 04, 2016 at 06:44:09PM +0200, Ville Syrjälä wrote: > > On Mon, Jan 04, 2016 at 01:21:24PM +0200, Mika Kahola wrote: > > > 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 <mika.kahola@xxxxxxxxx> > > > --- > > > 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); > > > } > > > > Should do the same for the MST case I suppose? > > Also I wonder if we shold maintain some sort of blacklist of unstable > vswing/preemph settings so that we wouldn't even try to retrain with > values we know to be of questionable quality... I think it would be quite tricky to maintain such a list. There is quite a bunch of source/sink combinations out there. For eDP this would be easier if we could first learn which vsing/preemph settings are unusable and maintain the blacklist based on that. Cheers, Mika > > > > > > -- > > > 1.9.1 > > > > -- > > Ville Syrjälä > > Intel OTC > > _______________________________________________ > > Intel-gfx mailing list > > Intel-gfx@xxxxxxxxxxxxxxxxxxxxx > > http://lists.freedesktop.org/mailman/listinfo/intel-gfx > _______________________________________________ Intel-gfx mailing list Intel-gfx@xxxxxxxxxxxxxxxxxxxxx http://lists.freedesktop.org/mailman/listinfo/intel-gfx
