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SubjectRe: [PATCH v3 1/2] power: domain: handle power supplies that need interrupts
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Am Montag, dem 18.07.2022 um 23:03 +0200 schrieb Martin Kepplinger:
> 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@pengutronix.de/
> 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@puri.sm/T/
>
> Signed-off-by: Martin Kepplinger <martin.kepplinger@puri.sm>
> ---
>
> 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@puri.sm/
>
> v1: (initial idea)
> https://lore.kernel.org/linux-arm-kernel/20220711094549.3445566-1-martin.kepplinger@puri.sm/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 */


I just noticed this should be 2 patches. I'll wait for feedback before
resending. thanks,

martin


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