On Tue, 26 Jul 2022 at 10:33, Martin Kepplinger <martin.kepplinger@xxxxxxx> wrote: > > If for example the power-domains' power-supply node (regulator) needs > interrupts to work, the current setup with noirq callbacks cannot > work; for example a pmic regulator on i2c, when suspending, usually already > times out during suspend_noirq: > > [ 41.024193] buck4: failed to disable: -ETIMEDOUT > > So fix system suspend and resume for these power-domains by using the > "outer" suspend/resume callbacks instead. Tested on the imx8mq-librem5 board, > but by looking at the dts, this will fix imx8mq-evk and possibly many other > boards too. > > This is designed so that genpd providers just say "this genpd needs > interrupts" (by setting the flag) - without implying an implementation. > > Initially system suspend problems had been discussed at > https://lore.kernel.org/linux-arm-kernel/20211002005954.1367653-8-l.stach@xxxxxxxxxxxxxx/ > which led to discussing the pmic that contains the regulators which > serve as power-domain power-supplies: > https://lore.kernel.org/linux-pm/573166b75e524517782471c2b7f96e03fd93d175.camel@xxxxxxx/T/ > > Signed-off-by: Martin Kepplinger <martin.kepplinger@xxxxxxx> > --- > drivers/base/power/domain.c | 13 +++++++++++-- > include/linux/pm_domain.h | 5 +++++ > 2 files changed, 16 insertions(+), 2 deletions(-) > > diff --git a/drivers/base/power/domain.c b/drivers/base/power/domain.c > index 5a2e0232862e..58376752a4de 100644 > --- a/drivers/base/power/domain.c > +++ b/drivers/base/power/domain.c > @@ -130,6 +130,7 @@ static const struct genpd_lock_ops genpd_spin_ops = { > #define genpd_is_active_wakeup(genpd) (genpd->flags & GENPD_FLAG_ACTIVE_WAKEUP) > #define genpd_is_cpu_domain(genpd) (genpd->flags & GENPD_FLAG_CPU_DOMAIN) > #define genpd_is_rpm_always_on(genpd) (genpd->flags & GENPD_FLAG_RPM_ALWAYS_ON) > +#define genpd_irq_on(genpd) (genpd->flags & GENPD_FLAG_IRQ_ON) > > static inline bool irq_safe_dev_in_sleep_domain(struct device *dev, > const struct generic_pm_domain *genpd) > @@ -2065,8 +2066,15 @@ int pm_genpd_init(struct generic_pm_domain *genpd, > genpd->domain.ops.runtime_suspend = genpd_runtime_suspend; > genpd->domain.ops.runtime_resume = genpd_runtime_resume; > genpd->domain.ops.prepare = genpd_prepare; > - genpd->domain.ops.suspend_noirq = genpd_suspend_noirq; > - genpd->domain.ops.resume_noirq = genpd_resume_noirq; > + > + if (genpd_irq_on(genpd)) { > + genpd->domain.ops.suspend = genpd_suspend_noirq; > + genpd->domain.ops.resume = genpd_resume_noirq; > + } else { > + genpd->domain.ops.suspend_noirq = genpd_suspend_noirq; > + genpd->domain.ops.resume_noirq = genpd_resume_noirq; As we discussed previously, I am thinking that it may be better to move to using genpd->domain.ops.suspend_late and genpd->domain.ops.resume_early instead. Beside this, I think the $subject patch looks good to me. [...] Kind regards Uffe
