| Message ID | 20240905-lpm-v6-10-constraints-pmdomain-v3-3-e359cbb39654@baylibre.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | pmdomain: ti_sci: collect and send low-power mode constraints | expand |
On Fri, 6 Sept 2024 at 00:03, Kevin Hilman <khilman@baylibre.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@baylibre.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
Ulf Hansson <ulf.hansson@linaro.org> writes: > On Fri, 6 Sept 2024 at 00:03, Kevin Hilman <khilman@baylibre.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@baylibre.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; ? > Oops, I meant to remove the "false" return when changing from bool to void, but mistakenly removed the whole line. d'oh!, good catch. Thanks. Kevin
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__); + ret = ti_sci->ops.pm_ops.set_device_constraint(ti_sci, pd->idx, TISCI_MSG_CONSTRAINT_SET); if (!ret)
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@baylibre.com> --- drivers/pmdomain/ti/ti_sci_pm_domains.c | 7 +++++++ 1 file changed, 7 insertions(+)