linux-kernel - Re: [PATCH v2 1/9] PM: domains: Delete usage of driver_deferred_probe_check

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Date:   Fri, 1 Jul 2022 09:30:28 +0200
From:   Geert Uytterhoeven <geert@...ux-m68k.org>
To:     Saravana Kannan <saravanak@...gle.com>
Cc:     Alexander Stein <alexander.stein@...tq-group.com>,
        Tony Lindgren <tony@...mide.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "Rafael J. Wysocki" <rafael@...nel.org>,
        Kevin Hilman <khilman@...nel.org>,
        Ulf Hansson <ulf.hansson@...aro.org>,
        Len Brown <len.brown@...el.com>, Pavel Machek <pavel@....cz>,
        Joerg Roedel <joro@...tes.org>, Will Deacon <will@...nel.org>,
        Andrew Lunn <andrew@...n.ch>,
        Heiner Kallweit <hkallweit1@...il.com>,
        Russell King <linux@...linux.org.uk>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Linus Walleij <linus.walleij@...aro.org>,
        Hideaki YOSHIFUJI <yoshfuji@...ux-ipv6.org>,
        David Ahern <dsahern@...nel.org>,
        Android Kernel Team <kernel-team@...roid.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Linux PM list <linux-pm@...r.kernel.org>,
        Linux IOMMU <iommu@...ts.linux-foundation.org>,
        netdev <netdev@...r.kernel.org>,
        "open list:GPIO SUBSYSTEM" <linux-gpio@...r.kernel.org>
Subject: Re: [PATCH v2 1/9] PM: domains: Delete usage of driver_deferred_probe_check_state()

Hi Saravana,

On Fri, Jul 1, 2022 at 2:37 AM Saravana Kannan <saravanak@...gle.com> wrote:
> On Thu, Jun 23, 2022 at 5:08 AM Alexander Stein
> <alexander.stein@...tq-group.com> wrote:
> > Am Dienstag, 21. Juni 2022, 09:28:43 CEST schrieb Tony Lindgren:

> > > * Saravana Kannan <saravanak@...gle.com> [700101 02:00]:
> > > > Now that fw_devlink=on by default and fw_devlink supports
> > > > "power-domains" property, the execution will never get to the point
> > > > where driver_deferred_probe_check_state() is called before the supplier
> > > > has probed successfully or before deferred probe timeout has expired.
> > > >
> > > > So, delete the call and replace it with -ENODEV.
> > >
> > > Looks like this causes omaps to not boot in Linux next. With this
> > > simple-pm-bus fails to probe initially as the power-domain is not
> > > yet available. On platform_probe() genpd_get_from_provider() returns
> > > -ENOENT.
> > >
> > > Seems like other stuff is potentially broken too, any ideas on
> > > how to fix this?
> >
> > I think I'm hit by this as well, although I do not get a lockup.
> > In my case I'm using arch/arm64/boot/dts/freescale/imx8mq-tqma8mq-mba8mx.dts
> > and probing of 38320000.blk-ctrl fails as the power-domain is not (yet)
> > registed.
>
> Ok, took a look.
>
> The problem is that there are two drivers for the same device and they
> both initialize this device.
>
>     gpc: gpc@...a0000 {
>         compatible = "fsl,imx8mq-gpc";
>     }
>
> $ git grep -l "fsl,imx7d-gpc" -- drivers/
> drivers/irqchip/irq-imx-gpcv2.c
> drivers/soc/imx/gpcv2.c

You missed the "driver" in arch/arm/mach-imx/src.c ;-)

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