tree 012184b8f96db878058ba6b0983de137f1331c6b
parent 768e847759d551c96e129e194588dbfb11a1d576
author Ben Skeggs <bskeggs@redhat.com> 1478155053 +1000
committer Ben Skeggs <bskeggs@redhat.com> 1478491470 +1000

drm/nouveau/i2c/aux/g94-: retry transactions after hw reports an error

This fixes (works around?) link training failures seen on (at least)
the Lenovo P50's internal panel.

It's also an important fix on the same system for MST support on the
dock.  Sometimes, right after receiving an IRQ from the sink, there's
an error bit (SINKSTAT_ERR) set in the DPAUX registers before we've
even attempted a transaction.

v2. Fixed regression on passive DP->DVI adapters.

Signed-off-by: Ben Skeggs <bskeggs@redhat.com>