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Message-ID: <CAPDyKFquSHYLGzd288K3JSOF_p+UyRO8GoBP9TGCR_3syGXTDw@mail.gmail.com> Date: Fri, 6 Sep 2024 10:54:58 +0200 From: Ulf Hansson <ulf.hansson@...aro.org> To: Kevin Hilman <khilman@...libre.com> Cc: linux-pm@...r.kernel.org, Nishanth Menon <nm@...com>, Vibhore Vardhan <vibhore@...com>, Dhruva Gole <d-gole@...com>, Akashdeep Kaur <a-kaur@...com>, Sebin Francis <sebin.francis@...com>, Markus Schneider-Pargmann <msp@...libre.com>, linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org Subject: Re: [PATCH v3 3/3] pmdomain: ti_sci: handle wake IRQs for IO daisy chain wakeups On Fri, 6 Sept 2024 at 00:03, Kevin Hilman <khilman@...libre.com> wrote: > > When a device supports IO daisy-chain wakeups, it uses a dedicated > wake IRQ. Devices with IO daisy-chain wakeups enabled should not set > wakeup constraints since these can happen even from deep power states, > so should not prevent the DM from picking deep power states. > > Wake IRQs are set with dev_pm_set_wake_irq() or > dev_pm_set_dedicated_wake_irq(). The latter is used by the serial > driver used on K3 platforms (drivers/tty/serial/8250/8250_omap.c) > when the interrupts-extended property is used to describe the > dedicated wakeup interrupt. > > Detect these wake IRQs in the suspend path, and if set, skip sending > constraint. > > Signed-off-by: Kevin Hilman <khilman@...libre.com> > --- > drivers/pmdomain/ti/ti_sci_pm_domains.c | 7 +++++++ > 1 file changed, 7 insertions(+) > > diff --git a/drivers/pmdomain/ti/ti_sci_pm_domains.c b/drivers/pmdomain/ti/ti_sci_pm_domains.c > index 1ab1e46924ab..747a7a33c0a9 100644 > --- a/drivers/pmdomain/ti/ti_sci_pm_domains.c > +++ b/drivers/pmdomain/ti/ti_sci_pm_domains.c > @@ -82,6 +82,13 @@ static inline void ti_sci_pd_set_wkup_constraint(struct device *dev) > int ret; > > if (device_may_wakeup(dev)) { > + /* > + * If device can wakeup using IO daisy chain wakeups, > + * we do not want to set a constraint. > + */ > + if (dev->power.wakeirq) > + dev_dbg(dev, "%s: has wake IRQ, not setting constraints\n", __func__); return; ? > + > ret = ti_sci->ops.pm_ops.set_device_constraint(ti_sci, pd->idx, > TISCI_MSG_CONSTRAINT_SET); > if (!ret) > > -- > 2.46.0 > Kind regards Uffe
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