linux-kernel - Re: [PATCH v1 3/3] Revert "Revert "driver core: Set fw

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Date:   Tue, 27 Apr 2021 09:05:43 +0200
From:   Geert Uytterhoeven <geert@...ux-m68k.org>
To:     Florian Fainelli <f.fainelli@...il.com>
Cc:     Saravana Kannan <saravanak@...gle.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "Rafael J. Wysocki" <rafael@...nel.org>,
        Al Cooper <alcooperx@...il.com>,
        Jim Quinlan <james.quinlan@...adcom.com>,
        Sudeep Holla <sudeep.holla@....com>,
        Cristian Marussi <cristian.marussi@....com>,
        Michael Walle <michael@...le.cc>,
        Jon Hunter <jonathanh@...dia.com>,
        Marek Szyprowski <m.szyprowski@...sung.com>,
        Guenter Roeck <linux@...ck-us.net>,
        Android Kernel Team <kernel-team@...roid.com>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v1 3/3] Revert "Revert "driver core: Set fw_devlink=on by default""

Hi Florian,

On Mon, Apr 26, 2021 at 11:48 PM Florian Fainelli <f.fainelli@...il.com> wrote:
> On 4/26/21 2:33 PM, Saravana Kannan wrote:
> > On Mon, Apr 26, 2021 at 1:51 PM Florian Fainelli <f.fainelli@...il.com> wrote:
> >> On 3/2/21 1:11 PM, Saravana Kannan wrote:
> >>> This reverts commit 3e4c982f1ce75faf5314477b8da296d2d00919df.
> >>>
> >>> Since all reported issues due to fw_devlink=on should be addressed by
> >>> this series, revert the revert. fw_devlink=on Take II.
> >>>
> >>> Signed-off-by: Saravana Kannan <saravanak@...gle.com>
> >>
> >> This change breaks booting on SCMI-based platforms such as ARCH_BRCMSTB.
> >> If I revert this change or boot with fw_devlink=permissive, then our
> >> systems boot again. From a quick look, the SCMI clock provider was never
> >> probed which means that our UART driver never got a chance to get its
> >> clock and we have no console -> timeout.
> >
> > We explicitly landed changes to handle this condition. So we'll see if
> > this is what is happening.
> >
> >> Al, AFAICT you had started to analyze this before in the context of
> >> SCMI, do you mind sharing what you had found?
> >>
> >> Saravana, is there any debugging output that we can help provide?
> >
> > Thanks for the report. Couple of things that can help:
> > 1. Example DTS file (the final board file so that I can get the full DT view).
>
> Attached BCX972160DV.dts which is one such system.
>
> > 2. Point out the UART device node and the SCMI device node that you
> > suspect is causing the issue.
>
> The SCMI provider node is brcm_scmi@0 and its sub-node protocol@14 is
> the clock provider. The UART node is /rdb/serial@...c000.

I guess dependencies on SCMI sub-nodes are not handled correctly?

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