[REGRESSION] GM20B probe fails after commit 2541626cfb79

[Diogo Ivo]

On Fri, Jan 27, 2023 at 04:00:59PM +1000, Ben Skeggs wrote:
> On Fri, 20 Jan 2023 at 21:37, Diogo Ivo <diogo.ivo at tecnico.ulisboa.pt> wrote:
> >
> > On Wed, Jan 18, 2023 at 11:28:49AM +1000, Ben Skeggs wrote:
> > > On Mon, 16 Jan 2023 at 22:27, Diogo Ivo <diogo.ivo at tecnico.ulisboa.pt> wrote:
> > > > On Mon, Jan 16, 2023 at 07:45:05AM +1000, David Airlie wrote:
> > > > > As a quick check can you try changing
> > > > >
> > > > > drivers/gpu/drm/nouveau/nvkm/core/firmware.c:nvkm_firmware_mem_target
> > > > > from NVKM_MEM_TARGET_HOST to NVKM_MEM_TARGET_NCOH ?
> >
> > > In addition to Dave's change, can you try changing the
> > > nvkm_falcon_load_dmem() call in gm20b_pmu_init() to:
> > >
> > > nvkm_falcon_pio_wr(falcon, (u8 *)&args, 0, 0, DMEM, addr_args,
> > > sizeof(args), 0, false);
> >
> > Chiming in just to say that with this change I see the same as Nicolas
> > except that the init message size is 255 instead of 0:
> >
> > [    2.196934] nouveau 57000000.gpu: pmu: unexpected init message size 255 vs 42
> I've attached an entirely untested patch (to go on top of the other
> hacks/fixes so far), that will hopefully get us a little further.

Hello,

Thank you for the patch! I can confirm that it fixes the problem
on the Pixel C, and everything works as before the regression.
With this, for the combination of patches

Tested-by: Diogo Ivo <diogo.ivo at tecnico.ulisboa.pt> 

which I can resend after testing the final patch version.

Thanks,
Diogo