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

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Message-ID: <g2ka728f9f91004011339o49bfe665od525acc1464cbdb@mail.gmail.com>
Date:	Thu, 1 Apr 2010 16:39:50 -0400
From:	Alex Deucher <alexdeucher@...il.com>
To:	"Rafael J. Wysocki" <rjw@...k.pl>
Cc:	Clemens Ladisch <clemens@...isch.de>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Linux PCI <linux-pci@...r.kernel.org>,
	Greg KH <gregkh@...e.de>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Jesse Barnes <jbarnes@...tuousgeek.org>,
	dri-devel@...ts.sourceforge.net, stable@...nel.org,
	Dave Airlie <airlied@...il.com>
Subject: Re: [Regression, post-rc2] Commit a5ee4eb7541 breaks OpenGL on RS780 
	(was: Re: Linux 2.6.34-rc3)

On Thu, Apr 1, 2010 at 4:28 PM, Rafael J. Wysocki <rjw@...k.pl> wrote:
> On Thursday 01 April 2010, Alex Deucher wrote:
>> On Thu, Apr 1, 2010 at 2:36 AM, Clemens Ladisch <clemens@...isch.de> wrote:
>> > Alex Deucher wrote:
>> >> On Wed, Mar 31, 2010 at 9:13 PM, Rafael J. Wysocki <rjw@...k.pl> wrote:
>> >>> On Tuesday 30 March 2010, Rafael J. Wysocki wrote:
>> >>>> >       PCI quirk: RS780/RS880: work around missing MSI initialization
>> >>>>
>> >>>> This one (commit a5ee4eb7541) broke OpenGL acceleration on my new test box
>> >>>> which happens to have a RS780.
>> >
>> > So it's better to disable MSI unconditionally.
>> >
>> > Rafael, can you check if MSI works for the HDMI audio device?
>> > (I'd guess it doesn't.)
>> >
>> >> I also have the attached patch queued in via Dave's tree to disable
>> >> MSI on all IGP chips for the time being.
>> >
>> > This disables MSI only for the graphics device.  I'd prefer to have
>> > the quirk on its bridge so that MSI gets disabled for the HDMI audio
>> > device too, to avoid having to duplicate this quirk in the snd-hda-intel
>> > driver.
>> >
>> > ==========
>> >
>> > PCI quirk: RS780/RS880: disable MSI completely
>> >
>> > The missing initialization of the nb_cntl.strap_msi_enable does not seem
>> > to be the only problem that prevents MSI, so that quirk is not
>> > sufficient to enable MSI on all machines.  To be safe, unconditionally
>> > disable MSI for the internal graphics and HDMI audio on these chipsets.
>> >
>> > Signed-off-by: Clemens Ladisch <clemens@...isch.de>
>>
>> Works fine here.
>>
>> Tested-by: Alex Deucher <alexdeucher@...il.com>
>
> Unfortunately it doesn't work for me without the
>
> if ((rdev->family >= CHIP_RV380) &&
>            (!(rdev->flags & RADEON_IS_IGP)))
>
> radeon quirk.

what are your pci ids?

Alex

>
> Thanks,
> Rafael
>
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