On Mon, May 22, 2023 at 3:06 AM Geert Uytterhoeven <geert@xxxxxxxxxxxxxx> wrote:
>
> Hi Adam,
>
> On Sat, May 20, 2023 at 5:13 AM Adam Ford <aford173@xxxxxxxxx> wrote:
> > I am trying to see if the Open Source PowerVR driver [1] for the 6250
> > can be made to work on the RZ/G2M, and I am having difficulty getting
> > the power domain to turn on.
> >
> > In the GPU node, I set:
> > power-domains = <&sysc R8A774A1_PD_3DG_B>;
>
> LGTM...
>
> > Unfortunately, when it boots, I get the following error message:
> >
> > [ 8.313305] powervr fd000000.gpu: error -ENOENT: failed to add to
> > PM domain 3dg-b
>
> That means genpd_add_device() failed (but why?)...
With a pointer from Marek V, I appear to have the necessary clock and
the power domain operational by borrowing from the down-stream RZ/G2
kernel. Even if I cannot get the PVR driver working with this kernel,
would you accept the clock and power domain patch now, or do you want
me to wait until we have a user of these (aka PVR) working?
adam
>
> > [ 8.320822] powervr: probe of fd000000.gpu failed with error -2
> >
> > Is there something I need to do in order to use this? it appears the
> > 3DG_B starts 3DG_A if I understand this correctly.
> >
> > Unfortunately, I don't see the parent child relationship between the
> > 3DG_B and the GPU
> >
> > root@beacon-rzg2m:~# cat /sys/kernel/debug/pm_genpd/pm_genpd_summary
> > domain status children
> > performance
> > /device runtime status
> > ----------------------------------------------------------------------------------------------
> > clock-controller on
> > 0
> > 3dg-b off-0
> > 0
> > 3dg-a off-0
> > 0
> > 3dg-b
>
> ... hence the relationship does not show up.
>
> Gr{oetje,eeting}s,
>
> Geert
>
> --
> Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@xxxxxxxxxxxxxx
>
> In personal conversations with technical people, I call myself a hacker. But
> when I'm talking to journalists I just say "programmer" or something like that.
> -- Linus Torvalds
