linux-kernel - Re: [PATCH v3 2/4] irqchip/qcom-pdc: Switch to using IRQCHIP_PLATFORM

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Date:   Wed, 5 Aug 2020 14:57:14 -0700
From:   John Stultz <john.stultz@...aro.org>
To:     Steev Klimaszewski <steev@...i.org>
Cc:     Saravana Kannan <saravanak@...gle.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Jason Cooper <jason@...edaemon.net>,
        Marc Zyngier <maz@...nel.org>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Andy Gross <agross@...nel.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Android Kernel Team <kernel-team@...roid.com>,
        lkml <linux-kernel@...r.kernel.org>,
        linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
        "moderated list:ARM/Mediatek SoC support" 
        <linux-mediatek@...ts.infradead.org>,
        linux-arm-msm <linux-arm-msm@...r.kernel.org>,
        Hanks Chen <hanks.chen@...iatek.com>,
        CC Hwang <cc.hwang@...iatek.com>,
        Loda Chou <loda.chou@...iatek.com>
Subject: Re: [PATCH v3 2/4] irqchip/qcom-pdc: Switch to using
 IRQCHIP_PLATFORM_DRIVER helper macros

On Wed, Aug 5, 2020 at 2:47 PM Steev Klimaszewski <steev@...i.org> wrote:
>
>
> On 8/5/20 4:16 PM, Steev Klimaszewski wrote:
> > On 8/5/20 3:19 PM, Saravana Kannan wrote:
> >> On Wed, Aug 5, 2020 at 12:44 AM John Stultz <john.stultz@...aro.org> wrote:
> >>> <sigh>
> >>> So this is where I bashfully admit I didn't get a chance to try this
> >>> patch series out, as I had success with a much older version of
> >>> Saravana's macro magic.
> >>>
> >>> But unfortunately, now that this has landed in mainline, I'm seeing
> >>> boot regressions on db845c. :( This is in the non-modular case,
> >>> building the driver in.
> >> Does that mean the modular version is working? Or you haven't tried
> >> that yet? I'll wait for your reply before I try to fix it. I don't
> >> have the hardware, but it should be easy to guess this issue looking
> >> at the code delta.
> > For what it's worth, I saw this too on the Lenovo C630 (started on -next
> > around 20200727, but I didn't track it down as, well, there's less way
> > to get debug output on the C630.
> >
> > In my testing, module or built-in doesn't matter, but reverting does
> > allow me to boot again.
> >
> Actually - I spoke too soon - QCOM_PDC built-in with the commit reverted
> boots, however, module (on the c630 at least) doesn't boot whether it's
> a module or built-in.

You may need to set deferred_probe_timeout=30 to give things a bit
more grace time to load.
(I've mostly recently used qcom-pdc as a module with the android tree,
so the fw_devlink bits help there, but I need to re-check the state of
that upstream.)

I'll dbl check this and dig more on the issue with the patch in
question once I can get back in my office later today.

thanks
-john