Re: [PATCH v4 0/8] Make fw_devlink=on more forgiving

[Geert Uytterhoeven]

Hi Saravana,

On Mon, Feb 15, 2021 at 10:57 PM Saravana Kannan <saravanak@xxxxxxxxxx> wrote:
> On Mon, Feb 15, 2021 at 7:16 AM Geert Uytterhoeven <geert@xxxxxxxxxxxxxx> wrote:
> > On Fri, Feb 12, 2021 at 4:00 AM Saravana Kannan <saravanak@xxxxxxxxxx> wrote:
> > > On Thu, Feb 11, 2021 at 5:00 AM Geert Uytterhoeven <geert@xxxxxxxxxxxxxx> wrote:
> > > >   1. R-Car Gen2 (Koelsch), R-Car Gen3 (Salvator-X(S), Ebisu).
> > > >
> > > >       - Commit 2dfc564bda4a31bc ("soc: renesas: rcar-sysc: Mark device
> > > >         node OF_POPULATED after init") is no longer needed (but already
> > > >         queued for v5.12 anyway)
> > >
> > > Rob doesn't like the proliferation of OF_POPULATED and we don't need
> > > it anymore, so maybe work it out with him? It's a balance between some
> > > wasted memory (struct device(s)) vs not proliferating OF_POPULATED.
> >
> > > >   2. SH/R-Mobile AG5 (kzm9g), APE6 (ape6evm), A1 (armadillo800-eva)
> > > >
> > > >       - "PATCH] soc: renesas: rmobile-sysc: Set OF_POPULATED and absorb
> > > >         reset handling" is no longer needed
> > > >         https://lore.kernel.org/linux-arm-kernel/20210205133319.1921108-1-geert+renesas@xxxxxxxxx/
> > >
> > > Good to see more evidence that this series is fixing things at a more
> > > generic level.
> >
> > I spoke too soon: if CONFIG_POWER_RESET_RMOBILE=n,
> > booting fails again, as everything is waiting on the system controller,
> > which never becomes available.
> > Rcar-sysc doesn't suffer from this problem, cfr. above.
> > Perhaps because the rmobile-sysc bindings use a hierarchical instead
> > of a linear PM domain description, and thus consumers point to the
> > children of the system controller node?
> > Cfr. system-controller@e6180000 in arch/arm/boot/dts/r8a7740.dtsi.
>
> Ok, I see what's going on. The problem is that the "power domain"
> fwnode being registered is not the node that contains the "compatible"
> property and becomes a device. So this patch[1] is not helping here.
> Fix is to do something like this (to avoid using OF_POPULATED flag and
> breaking reset):
>
> diff --git a/drivers/soc/renesas/rmobile-sysc.c
> b/drivers/soc/renesas/rmobile-sysc.c
> index 9046b8c933cb..b7e66139ef7d 100644
> --- a/drivers/soc/renesas/rmobile-sysc.c
> +++ b/drivers/soc/renesas/rmobile-sysc.c
> @@ -344,6 +344,7 @@ static int __init rmobile_init_pm_domains(void)
>                         of_node_put(np);
>                         break;
>                 }
> +               fwnode_dev_initialized(&np->fwnode, true);
>         }
>
>         put_special_pds();
>
> Can you give it a shot?

Thanks, works.  Patch sent
"[PATCH v2] soc: renesas: rmobile-sysc: Mark fwnode when PM domain is added"
https://lore.kernel.org/linux-arm-kernel/20210216123958.3180014-1-geert+renesas@xxxxxxxxx/

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