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Date:   Tue, 5 Jul 2022 01:44:07 -0700
From:   Saravana Kannan <saravanak@...gle.com>
To:     Sudeep Holla <sudeep.holla@....com>
Cc:     Tony Lindgren <tony@...mide.com>, Rob Herring <robh@...nel.org>,
        Geert Uytterhoeven <geert@...ux-m68k.org>,
        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@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "open list:THERMAL" <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>,
        Alexander Stein <alexander.stein@...tq-group.com>
Subject: Re: [PATCH v2 1/9] PM: domains: Delete usage of driver_deferred_probe_check_state()

On Fri, Jul 1, 2022 at 12:13 PM Saravana Kannan <saravanak@...gle.com> wrote:
>
> On Fri, Jul 1, 2022 at 8:08 AM Sudeep Holla <sudeep.holla@....com> wrote:
> >
> > Hi, Saravana,
> >
> > On Fri, Jul 01, 2022 at 01:26:12AM -0700, Saravana Kannan wrote:
> >
> > [...]
> >
> > > Can you check if this hack helps? If so, then I can think about
> > > whether we can pick it up without breaking everything else. Copy-paste
> > > tab mess up warning.
> >
> > Sorry for jumping in late and not even sure if this is right thread.
> > I have not bisected anything yet, but I am seeing issues on my Juno R2
> > with SCMI enabled power domains and Coresight AMBA devices.
> >
> > OF: amba_device_add() failed (-19) for /etf@...10000
> > OF: amba_device_add() failed (-19) for /tpiu@...30000
> > OF: amba_device_add() failed (-19) for /funnel@...40000
> > OF: amba_device_add() failed (-19) for /etr@...70000
> > OF: amba_device_add() failed (-19) for /stm@...00000
> > OF: amba_device_add() failed (-19) for /replicator@...20000
> > OF: amba_device_add() failed (-19) for /cpu-debug@...10000
> > OF: amba_device_add() failed (-19) for /etm@...40000
> > OF: amba_device_add() failed (-19) for /cti@...20000
> > OF: amba_device_add() failed (-19) for /funnel@...c0000
> > OF: amba_device_add() failed (-19) for /cpu-debug@...10000
> > OF: amba_device_add() failed (-19) for /etm@...40000
> > OF: amba_device_add() failed (-19) for /cti@...20000
> > OF: amba_device_add() failed (-19) for /cpu-debug@...10000
> > OF: amba_device_add() failed (-19) for /etm@...40000
> > OF: amba_device_add() failed (-19) for /cti@...20000
> > OF: amba_device_add() failed (-19) for /funnel@...c0000
> > OF: amba_device_add() failed (-19) for /cpu-debug@...10000
> > OF: amba_device_add() failed (-19) for /etm@...40000
> > OF: amba_device_add() failed (-19) for /cti@...20000
> > OF: amba_device_add() failed (-19) for /cpu-debug@...10000
> > OF: amba_device_add() failed (-19) for /etm@...40000
> > OF: amba_device_add() failed (-19) for /cti@...20000
> > OF: amba_device_add() failed (-19) for /cpu-debug@...10000
> > OF: amba_device_add() failed (-19) for /etm@...40000
> > OF: amba_device_add() failed (-19) for /cti@...20000
> > OF: amba_device_add() failed (-19) for /cti@...20000
> > OF: amba_device_add() failed (-19) for /cti@...10000
> > OF: amba_device_add() failed (-19) for /funnel@...30000
> > OF: amba_device_add() failed (-19) for /etf@...40000
> > OF: amba_device_add() failed (-19) for /funnel@...50000
> > OF: amba_device_add() failed (-19) for /cti@...60000
> >
> > These are working fine with deferred probe in the mainline.
> > I tried the hack you have suggested here(rather Tony's version),
>
> Thanks for trying that.
>
> > also
> > tried with fw_devlink=0 and fw_devlink=1
>
> 0 and 1 aren't valid input to fw_devlink. But yeah, I don't expect
> disabling it to make anything better.
>
> > && fw_devlink.strict=0
> > No change in the behaviour.
> >
> > The DTS are in arch/arm64/boot/dts/arm/juno-*-scmi.dts and there
> > coresight devices are mostly in juno-cs-r1r2.dtsi
>
> Thanks
>
> > Let me know if there is anything obvious or you want me to bisect which
> > means I need more time. I can do that next week.
>
> I'll let you know once I poke at the DTS. We need to figure out why
> fw_devlink wasn't blocking these from getting to the error (same as in
> Tony's case). But since these are amba devices, I think I have some
> guesses.
>
> This is an old series that had some issues in some cases and I haven't
> gotten around to looking at it. You can give that a shot if you can
> apply it to a recent tree.
> https://lore.kernel.org/lkml/20210304195101.3843496-1-saravanak@google.com/

I rebased it to driver-core-next and tested the patch  (for
correctness, not with your issue though). I'm fairly sure it should
help with your issue. Can you give it a shot please?

https://lore.kernel.org/lkml/20220705083934.3974140-1-saravanak@google.com/T/#u

-Saravana

>
> After looking at that old patch again, I think I know what's going on.
> For normal devices, the pm domain attach happens AFTER the device is
> added and fw_devlink has had a chance to set up device links. And if
> the suppliers aren't ready, really_probe() won't get as far as
> dev_pm_domain_attach(). But for amba, the clock and pm domain
> suppliers are "grabbed" before adding the device.
>
> So with that old patch + always returning -EPROBE_DEFER in
> amba_device_add() if amba_read_periphid() fails should fix your issue.
>
> -Saravana

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