linux-kernel - Re: [Regression, post-rc2] Commit a5ee4eb7541 breaks OpenGL on RS780 (was: Re: Linux 2.6.34-rc3)

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Date:	Thu, 1 Apr 2010 13:07:59 -0400
From:	Alex Deucher <alexdeucher@...il.com>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	"Rafael J. Wysocki" <rjw@...k.pl>,
	Linux PCI <linux-pci@...r.kernel.org>,
	Greg KH <gregkh@...e.de>, Clemens Ladisch <clemens@...isch.de>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Jesse Barnes <jbarnes@...tuousgeek.org>,
	Alex Deucher <alexdeucher@...il.com>,
	dri-devel@...ts.sourceforge.net, stable@...nel.org
Subject: Re: [Regression, post-rc2] Commit a5ee4eb7541 breaks OpenGL on RS780 
	(was: Re: Linux 2.6.34-rc3)

On Thu, Apr 1, 2010 at 12:29 PM, Linus Torvalds
<torvalds@...ux-foundation.org> wrote:
>
>
> On Thu, 1 Apr 2010, Rafael J. Wysocki wrote:
>>
>> OK, I've verified that partial revert (below) is sufficient.
>
> Hmm. Through the DRM merge I just did, this area actually conflicted, and
> the resolved version is now
>
>        if ((rdev->family >= CHIP_RV380) &&
>            (!(rdev->flags & RADEON_IS_IGP))) {
>
> which presumably also fixes your issue?
>
> [ Side note: somebody in the DRM tree seems to be way too used to LISP,
>  and thinks that adding parenthesis always improves the code ;-]
>

heh, that's me.  habit I guess, just to be sure.

> However, I do suspect that we should probably revert the quirk regardless
> as being useless (ie it probably was related to those IGP chips that
> apparently don't do MSI anyway).
>
> So the patch that reverts the quirk by Clemens (to replace it with
> disabling MSI entirely when the AMD NB doesn't accept them) seems to be a
> good idea regardless, since it's apparently not just about gfx. Jesse?

Clemems' "PCI quirk: RS780/RS880: disable MSI completely" patch is the
right approach I think.  Note that it's only devices hung off the int
gfx pci to pci bridge that have broken MSI (gfx and audio).  MSI works
fine on the PCIE slots.  I have a similar patch for rs400 chips on bug
15626:
https://bugzilla.kernel.org/show_bug.cgi?id=15626

Alex

>
>                        Linus
>
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