If 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 other boards too. Possibly one can find more changes than suspend/resume for this case. They can be added later when testing them: This is designed so that genpd providers just say "this power-supply" needs interrupts - without implying what exactly should be configured in genpd. 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> --- revision history ---------------- v3: (thank you Ulf) * move DT parsing to gpcv2 and create a genpd flag that gets set v2: (thank you Krzysztof) * rewrite: find possible regulators' interrupts property in parents instead of inventing a new property. https://lore.kernel.org/linux-arm-kernel/20220712121832.3659769-1-martin.kepplinger@xxxxxxx/ v1: (initial idea) https://lore.kernel.org/linux-arm-kernel/20220711094549.3445566-1-martin.kepplinger@xxxxxxx/T/#t drivers/base/power/domain.c | 19 +++++++++++++++++++ drivers/soc/imx/gpcv2.c | 9 +++++++++ include/linux/pm_domain.h | 6 ++++++ 3 files changed, 34 insertions(+) diff --git a/drivers/base/power/domain.c b/drivers/base/power/domain.c index 739e52cd4aba..1437476c9086 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_ps_needs_irq(genpd) (genpd->flags & GENPD_FLAG_IRQ_POWER_SUPPLY) static inline bool irq_safe_dev_in_sleep_domain(struct device *dev, const struct generic_pm_domain *genpd) @@ -2298,6 +2299,20 @@ static bool genpd_present(const struct generic_pm_domain *genpd) return ret; } +/** + * of_genpd_get_power_supply_irq() - Adjust if power-supply needs interrupts + * @genpd: Pointer to PM domain associated with the PM domain provider. + */ +static void of_genpd_config_power_supply_irq(struct generic_pm_domain *pd) +{ + if (genpd_ps_needs_irq(pd)) { + pd->domain.ops.suspend = genpd_suspend_noirq; + pd->domain.ops.resume = genpd_resume_noirq; + pd->domain.ops.suspend_noirq = NULL; + pd->domain.ops.resume_noirq = NULL; + } +} + /** * of_genpd_add_provider_simple() - Register a simple PM domain provider * @np: Device node pointer associated with the PM domain provider. @@ -2343,6 +2358,8 @@ int of_genpd_add_provider_simple(struct device_node *np, genpd->provider = &np->fwnode; genpd->has_provider = true; + of_genpd_config_power_supply_irq(genpd); + return 0; } EXPORT_SYMBOL_GPL(of_genpd_add_provider_simple); @@ -2394,6 +2411,8 @@ int of_genpd_add_provider_onecell(struct device_node *np, genpd->provider = &np->fwnode; genpd->has_provider = true; + + of_genpd_config_power_supply_irq(genpd); } ret = genpd_add_provider(np, data->xlate, data); diff --git a/drivers/soc/imx/gpcv2.c b/drivers/soc/imx/gpcv2.c index 85aa86e1338a..3a22bad07534 100644 --- a/drivers/soc/imx/gpcv2.c +++ b/drivers/soc/imx/gpcv2.c @@ -1303,6 +1303,7 @@ static const struct imx_pgc_domain_data imx8mn_pgc_domain_data = { static int imx_pgc_domain_probe(struct platform_device *pdev) { struct imx_pgc_domain *domain = pdev->dev.platform_data; + struct device_node *dn; int ret; domain->dev = &pdev->dev; @@ -1333,6 +1334,14 @@ static int imx_pgc_domain_probe(struct platform_device *pdev) regmap_update_bits(domain->regmap, domain->regs->map, domain->bits.map, domain->bits.map); + dn = of_parse_phandle(domain->dev->of_node, "power-supply", 0); + if (dn) { + while ((dn = of_get_next_parent(dn))) { + if (of_get_property(dn, "interrupts", NULL)) + domain->genpd.flags |= GENPD_FLAG_IRQ_POWER_SUPPLY; + } + } + ret = pm_genpd_init(&domain->genpd, NULL, true); if (ret) { dev_err(domain->dev, "Failed to init power domain\n"); diff --git a/include/linux/pm_domain.h b/include/linux/pm_domain.h index ebc351698090..bcceaf376f36 100644 --- a/include/linux/pm_domain.h +++ b/include/linux/pm_domain.h @@ -60,6 +60,11 @@ * GENPD_FLAG_MIN_RESIDENCY: Enable the genpd governor to consider its * components' next wakeup when determining the * optimal idle state. + * + * GENPD_FLAG_IRQ_POWER_SUPPLY: The power-domains' power-supply (regulator) + * needs interrupts to work. Adjust accordingly. + * Use the outer suspend/resume callbacks instead + * of noirq for example. */ #define GENPD_FLAG_PM_CLK (1U << 0) #define GENPD_FLAG_IRQ_SAFE (1U << 1) @@ -68,6 +73,7 @@ #define GENPD_FLAG_CPU_DOMAIN (1U << 4) #define GENPD_FLAG_RPM_ALWAYS_ON (1U << 5) #define GENPD_FLAG_MIN_RESIDENCY (1U << 6) +#define GENPD_FLAG_IRQ_POWER_SUPPLY (1U << 7) enum gpd_status { GENPD_STATE_ON = 0, /* PM domain is on */ -- 2.30.2
