Re: [PATCH v2 0/9] driver core / pmdomain: Add support for fined grained sync_state

[Geert Uytterhoeven]

Hi Ulf,

On Fri, 10 Apr 2026 at 12:41, Ulf Hansson <ulf.hansson@xxxxxxxxxx> wrote:
> Since the introduction [1] of the common sync_state support for pmdomains
> (genpd), we have encountered a lot of various interesting problems. In most
> cases the new behaviour of genpd triggered some weird platform specific bugs.
>
> That said, in LPC in Tokyo me and Saravana hosted a session to walk through the
> remaining limitations that we have found for genpd's sync state support. In
> particular, we discussed the problems we have for the so-called onecell power
> domain providers, where a single provider typically provides multiple
> independent power domains, all with their own set of consumers.
>
> Note that, onecell power domain providers are very common. It's being used by
> many SoCs/platforms/technologies. To name a few:
> SCMI, Qualcomm, NXP, Mediatek, Renesas, TI, etc.
>
> Anyway, in these cases, the generic sync_state mechanism with fw_devlink isn't
> fine grained enough, as we end up waiting for all consumers for all power
> domains before the ->sync_callback gets called for the supplier/provider. In
> other words, we may end up keeping unused power domains powered-on, for no good
> reasons.
>
> The series intends to fix this problem. Please have a look at the commit
> messages for more details and help review/test!

Thanks for the update!

At first glance, the only real change compared to v1 seems to be
the removal of printing

    pr_info("%s:%s con=%s\n", __func__, dev_name(dev),
            dev_name(consumer));

Right?

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