Bug#790694: linux-image-3.16.0-4-powerpc64: nouveau driver and msi interrupts

[Peter Saisanas <psaisanas@gmail.com>]

Hi Ben,

Thanks for this, ill give it a go as soon as i get a chance.

I'd say msi interrupts are fine on x86 with this class of gpu, but with powerpc or this particular config it may be a problem.

I can give you the output of lspci -vvv when running with msi enabled on this particular GPU.
It would just hang when starting xorg.
When running /cat/proc/interrupts with msi enabled, it would show only one interrupt triggered on whatever cpu and hang the gpu if i recall.
Strangely enough, msi interrupts on powerpc seem to work fine just with the nouveau console framebuffer...

If i recall, even with msi enabled, the msi address was still 0x0. But i will send you a log for your reference.

Yes, and i am configuring kernel with 4kb kernel pagesize as there still seems to be an issue with 64kb kernel pagesizes and nouveau.

Thanks Ben,

Best Regards,

Peter

On Mon, Jul 6, 2015 at 10:39 AM, Ben Hutchings <ben@decadent.org.uk> wrote:

Actually this much simpler patch should do the trick; please test this
instead.

Ben.

--
Ben Hutchings
If you seem to know what you are doing, you'll be given more to do.