[Nouveau] [PATCH] nouveau: nv46: Change mc subdev oclass from nv44 to nv4c

[Ilia Mirkin]

On Thu, Jul 23, 2015 at 10:32 PM, Ben Skeggs <skeggsb at gmail.com> wrote:
> On 24 July 2015 at 01:20, Hans de Goede <hdegoede at redhat.com> wrote:
>> MSI interrupts appear to not work for nv46 based cards. Change the mc
>> subdev oclass for these cards from nv44 to nv4c, the nv4c mc code is
>> identical to the nv44 mc code except that it does not use msi
>> (it does not define a msi_rearm callback).
> I'm fine with this, but it'd be nice to check that the binary driver
> doesn't/can't use MSI on these too (there might be an alternate method
> we need to use).
>
> Would you be able to grab the latest proprietary driver that works on
> nv4x, and do a mmiotrace of it?  You *might* need to use "modprobe
> nvidia NVreg_EnableMSI=1", because at some point NVIDIA didn't use it
> by default anywhere.

AFAIK the blob never used MSI on nv4x. Perhaps we should have just
left it alone...