linux-kernel - Re: [PATCH 2/2] nouveau: Acknowledge HPD irq in handler, not bottom half

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Date:	Thu, 11 Nov 2010 08:58:57 +1000
From:	Ben Skeggs <bskeggs@...hat.com>
To:	Andrew Lutomirski <luto@....edu>
Cc:	dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/2] nouveau: Acknowledge HPD irq in handler, not
 bottom half

On Wed, 2010-11-10 at 17:51 -0500, Andrew Lutomirski wrote:
> On Wed, Nov 10, 2010 at 5:35 PM, Ben Skeggs <bskeggs@...hat.com> wrote:
> > On Wed, 2010-11-10 at 17:25 -0500, Andrew Lutomirski wrote:
> >> On Wed, Nov 10, 2010 at 5:10 PM, Ben Skeggs <bskeggs@...hat.com> wrote:
> >> > On Wed, 2010-11-10 at 16:32 -0500, Andy Lutomirski wrote:
> >> >> The old code generated an interrupt storm bad enough to completely
> >> >> take down my system.
> >> >>
> >> >> This only fixes the bits that are defined nouveau_regs.h.  Newer hardware
> >> >> uses another register that isn't described, and I don't have that hardware
> >> >> to test.
> >> > Thanks for looking at this.  I'll take a closer look at the problem
> >> > today and see what I can come up with too, that'll work with the newer
> >> > hardware too.
> >>
> >> It should be as simple as adding an hpd1 field to the hpd_state and
> >> making exactly the same change.  (It would be nice to put the register
> >> definitions into nouveau_regs.h as well -- I didn't really want to
> >> muck around with a bunch of magic numbers that I can't test.)
> > Yes, it is.  I can confirm the problem on another card, but it doesn't
> > actually cause any crashes here.  If you can rework the patch to support
> > the newer chips too, that'd be great.
> >
> > As for magic numbers, the register names for those regs are wrong
> > anyway.  The joy of reverse-engineering the support.  It doesn't really
> > matter if you want to stick to them or go back to "magic" numbers.
> 
> That explains why INTR and CTRL seemed backwards :)  I'll leave the
> magic numbers for the 0xe07? stuff.
That sounds good, it'll all get a cleanup at some point and switched to
"proper" (well, our best guess, you'd have to ask NVIDIA about the real
ones) names.

Ben.
> 
> Also, I accidentally dropped the "& enabled_bits" part -- I'll put that back.
> 
> Patch to follow after I boot and test it here.
> 
> --Andy


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