On Thu, Nov 27, 2014 at 3:52 PM, Dave Airlie <airlied@xxxxxxxxxx> wrote: > From: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx> > > Turning vdd on/off can generate a long hpd pulse on eDP ports. In order > to handle hpd we would need to turn on vdd to perform aux transfers. > This would lead to an endless cycle of > "vdd off -> long hpd -> vdd on -> detect -> vdd off -> ..." > > So ignore long hpd pulses on eDP ports. eDP panels should be physically > tied to the machine anyway so they should not actually disappear and > thus don't need long hpd handling. Short hpds are still needed for link > re-train and whatnot so we can't just turn off the hpd interrupt > entirely for eDP ports. Perhaps we could turn it off whenever the panel > is disabled, but just ignoring the long hpd seems sufficient. > > Signed-off-by: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx> > Cc: stable@xxxxxxxxxxxxxxx > Reviewed-by: Dave Airlie <airlied@xxxxxxxxxx> > Reviewed-by: Todd Previte <tprevite@xxxxxxxxx> > Signed-off-by: Jani Nikula <jani.nikula@xxxxxxxxx> Thanks. I'll get this applied today. josh _______________________________________________ kernel mailing list kernel@xxxxxxxxxxxxxxxxxxxxxxx https://admin.fedoraproject.org/mailman/listinfo/kernel
