[Nouveau] [Bug 89273] [NVA8] nouveau screen corruption and X lockup when reclocking

bugzilla-daemon at freedesktop.org bugzilla-daemon at freedesktop.org
Sat Feb 21 15:21:17 PST 2015


https://bugs.freedesktop.org/show_bug.cgi?id=89273

--- Comment #4 from Ilia Mirkin <imirkin at alum.mit.edu> ---
I believe the two issues are unrelated. The flickering issue is probably due to
incorrect timing parameters somewhere. The hang is, more than likely, due to

[  144.038590] nouveau W[   PFIFO][0000:01:00.0] unknown intr 0x00000040, ch 3

Which we don't handle currently. rnndb has it as

                        <bitfield pos="6" name="PEEPHOLE_FAULT"/>

So we probably have to reprogram PBUS.HOST_MEM.CHAN and PBUS.HOST_MEM.PEEPHOLE
(or at the very least the latter) -- that's 0x1704 and 0x1710 respectively. Not
100% sure what they are, but software/nv50.c does:

    nv_wr32(priv, 0x001704, chan->vblank.channel);
    nv_wr32(priv, 0x001710, 0x80000000 | chan->vblank.ctxdma);

Hopefully someone who understands these things a little better will step in
here.

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