From: Marc Zyngier <maz@kernel.org>
To: Stephen Boyd <swboyd@chromium.org>
Cc: Maulik Shah <mkshah@codeaurora.org>,
Jason Cooper <jason@lakedaemon.net>,
Saravana Kannan <saravanak@google.com>,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
lkml <linux-kernel@vger.kernel.org>,
Lina Iyer <ilina@codeaurora.org>,
linux-gpio@vger.kernel.org, iommu@lists.linux-foundation.org,
Andy Gross <agross@kernel.org>,
John Stultz <john.stultz@linaro.org>,
linux-arm-msm <linux-arm-msm@vger.kernel.org>,
Thomas Gleixner <tglx@linutronix.de>,
Linus Walleij <linus.walleij@linaro.org>,
Todd Kjos <tkjos@google.com>
Subject: Re: [PATCH v2 3/5] irqchip: Allow QCOM_PDC to be loadable as a permanent module
Date: Sun, 12 Jul 2020 10:27:20 +0100 [thread overview]
Message-ID: <87r1thxevb.wl-maz@kernel.org> (raw)
In-Reply-To: <159442366514.1987609.434612639050774557@swboyd.mtv.corp.google.com>
On Sat, 11 Jul 2020 00:27:45 +0100,
Stephen Boyd <swboyd@chromium.org> wrote:
>
> Quoting John Stultz (2020-07-10 15:44:18)
> > On Thu, Jul 9, 2020 at 11:02 PM Stephen Boyd <swboyd@chromium.org> wrote:
> > >
> > > Does it work? I haven't looked in detail but I worry that the child
> > > irqdomain (i.e. pinctrl-msm) would need to delay probing until this
> > > parent irqdomain is registered. Or has the hierarchical irqdomain code
> > > been updated to handle the parent child relationship and wait for things
> > > to probe or be loaded?
> >
> > So I can't say I know the underlying hardware particularly well, but
> > I've been using this successfully on the Dragonboard 845c with both
> > static builds as well as module enabled builds.
> > And the same patch has been in the android-mainline and android-5.4
> > kernels for a while without objections from QCOM.
> >
> > As to the probe ordering question, Saravana can maybe speak in more
> > detail if it's involved in this case but the fw_devlink code has
> > addressed many of these sorts of ordering issues.
> > However, I'm not sure if I'm lucking into the right probe order, as we
> > have been able to boot android-mainline w/ both fw_devlink=on and
> > fw_devlink=off (though in the =off case, we need
> > deferred_probe_timeout=30 to give us a bit more time for modules to
> > load after init starts).
> >
>
> Ok I looked at the code (sorry for not checking earlier) and I see this in
> msm_gpio_init()
>
> np = of_parse_phandle(pctrl->dev->of_node, "wakeup-parent", 0);
> if (np) {
> chip->irq.parent_domain = irq_find_matching_host(np,
> DOMAIN_BUS_WAKEUP);
> of_node_put(np);
> if (!chip->irq.parent_domain)
> return -EPROBE_DEFER;
>
> so it looks like we'll probe defer the pinctrl driver until the pdc module
> loads. Meaning it should work to have pinctrl builtin and pdc as a module.
What I hope is that eventually fw_devlink will become the norm (on by
default), and that probe deferral will become a thing of the past.
M.
--
Without deviation from the norm, progress is not possible.
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next prev parent reply other threads:[~2020-07-12 9:27 UTC|newest]
Thread overview: 28+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-06-25 0:10 [PATCH v2 0/5] Allow for qcom-pdc, pinctrl-msm and qcom-scm drivers to be loadable as modules John Stultz
2020-06-25 0:10 ` [PATCH v2 1/5] irq: irqdomain: Export irq_domain_update_bus_token John Stultz
2020-06-25 0:10 ` [PATCH v2 2/5] irq: irqchip: Export irq_chip_retrigger_hierarchy and irq_chip_set_vcpu_affinity_parent John Stultz
2020-06-25 0:10 ` [PATCH v2 3/5] irqchip: Allow QCOM_PDC to be loadable as a permanent module John Stultz
2020-06-26 7:42 ` Stephen Boyd
2020-06-27 1:34 ` John Stultz
2020-06-27 9:37 ` Marc Zyngier
2020-07-10 6:02 ` Stephen Boyd
2020-07-10 22:44 ` John Stultz
2020-07-10 23:27 ` Stephen Boyd
2020-07-12 9:27 ` Marc Zyngier [this message]
2020-06-25 0:10 ` [PATCH v2 4/5] pinctrl: qcom: Allow pinctrl-msm code to be loadable as a module John Stultz
2020-06-25 0:10 ` [PATCH v2 5/5] firmware: QCOM_SCM: Allow qcom_scm driver to be loadable as a permenent module John Stultz
2020-07-02 12:47 ` Greg Kroah-Hartman
2020-07-02 14:18 ` Will Deacon
2020-07-10 3:28 ` John Stultz
2020-07-10 7:54 ` Will Deacon
2020-07-10 22:21 ` John Stultz
2020-07-13 20:41 ` Will Deacon
2020-07-13 20:48 ` John Stultz
2020-07-14 7:56 ` Will Deacon
2020-10-28 5:53 ` John Stultz
2020-10-28 13:51 ` Will Deacon
2020-10-28 14:51 ` Robin Murphy
2020-10-30 1:02 ` John Stultz
2020-10-30 14:12 ` Robin Murphy
2020-10-31 0:12 ` John Stultz
2020-10-30 6:09 ` John Stultz
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