linux-kernel - Re: [PATCH v3 00/24] pmdomain: Add generic ->sync

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Message-ID: <CAMuHMdX1BacUfqtmV8g7NpRnY9aTdL=fh+jC7OryMLz4ijaOCg@mail.gmail.com>
Date: Wed, 30 Jul 2025 11:56:18 +0200
From: Geert Uytterhoeven <geert@...ux-m68k.org>
To: Ulf Hansson <ulf.hansson@...aro.org>
Cc: Saravana Kannan <saravanak@...gle.com>, Stephen Boyd <sboyd@...nel.org>, linux-pm@...r.kernel.org, 
	"Rafael J . Wysocki" <rafael@...nel.org>, Greg Kroah-Hartman <gregkh@...uxfoundation.org>, 
	Michael Grzeschik <m.grzeschik@...gutronix.de>, Bjorn Andersson <andersson@...nel.org>, 
	Abel Vesa <abel.vesa@...aro.org>, Peng Fan <peng.fan@....nxp.com>, 
	Tomi Valkeinen <tomi.valkeinen@...asonboard.com>, Johan Hovold <johan@...nel.org>, 
	Maulik Shah <maulik.shah@....qualcomm.com>, Michal Simek <michal.simek@....com>, 
	Konrad Dybcio <konradybcio@...nel.org>, Thierry Reding <thierry.reding@...il.com>, 
	Jonathan Hunter <jonathanh@...dia.com>, Hiago De Franco <hiago.franco@...adex.com>, 
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org, 
	Linux-Renesas <linux-renesas-soc@...r.kernel.org>
Subject: Re: [PATCH v3 00/24] pmdomain: Add generic ->sync_state() support to genpd

Hi Ulf,

On Wed, 9 Jul 2025 at 13:31, Ulf Hansson <ulf.hansson@...aro.org> wrote:
> On Tue, 1 Jul 2025 at 13:47, Ulf Hansson <ulf.hansson@...aro.org> wrote:
> > Changes in v3:
> >         - Added a couple of patches to adress problems on some Renesas
> >         platforms. Thanks Geert and Tomi for helping out!
> >         - Adressed a few comments from Saravanna and Konrad.
> >         - Added some tested-by tags.
>
> I decided it was time to give this a try, so I have queued this up for
> v6.17 via the next branch at my pmdomain tree.
>
> If you encounter any issues, please let me know so I can help to fix them.

Thanks for your series!  Due to holidays, I only managed to test
this very recently.

Unfortunately I have an issue with unused PM Domains no longer being
disabled on R-Car:
  - On R-Car Gen1/2/3, using rcar-sysc.c, unused PM Domains are never
    disabled.
  - On R-Car Gen4, using rcar-gen4-sysc.c, unused PM Domains are
    sometimes not disabled.
    At first, I noticed the IOMMU driver was not enabled in my config,
    and enabling it did fix the issue.  However, after that I still
    encountered the issue in a different config that does have the
    IOMMU driver enabled...

FTR, unused PM Domains are still disabled correctly on R/SH-Mobile
(using rmobile-sysc.c) and on BeagleBone Black. Note that these use
of_genpd_add_provider_simple(), while all R-Car drivers use
of_genpd_add_provider_onecell().  Perhaps there is an issue with
the latter?  If you don't have a clue, I plan to do some more
investigation later...

BTW, the "pending due to"-messages look weird to me.
On R-Car M2-W (r8a7791.dtsi) I see e.g.:

    genpd_provider ca15-cpu0: sync_state() pending due to e6020000.watchdog
    renesas-cpg-mssr e6150000.clock-controller: sync_state() pending
due to e6020000.watchdog

ca15-cpu0 is the PM Domain holding the first CPU core, while
the watchdog resides in the always-on Clock Domain, and uses the
clock-controller for PM_CLK handling.

Thanks!

Gr{oetje,eeting}s,

                        Geert

-- 
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68k.org

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