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SubjectRe: [PATCH 1/2] PM / Domains: Add GENPD_FLAG_SUSPEND_ON flag
On Tue, 11 Aug 2020 at 21:03, Sibi Sankar <sibis@codeaurora.org> wrote:
>
> This is for power domains which needs to stay powered on for suspend
> but can be powered on/off as part of runtime PM. This flag is aimed at
> power domains coupled to remote processors which enter suspend states
> independent to that of the application processor. Such power domains
> are turned off only on remote processor crash/shutdown.

As Kevin also requested, please elaborate more on the use case.

Why exactly must the PM domain stay powered on during system suspend?
Is there a wakeup configured that needs to be managed - or is there a
co-processor/FW behaviour that needs to be obeyed to?

Kind regards
Uffe

>
> Signed-off-by: Sibi Sankar <sibis@codeaurora.org>
> ---
> drivers/base/power/domain.c | 3 ++-
> include/linux/pm_domain.h | 5 +++++
> 2 files changed, 7 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/base/power/domain.c b/drivers/base/power/domain.c
> index 2cb5e04cf86cd..ba78ac4a450d4 100644
> --- a/drivers/base/power/domain.c
> +++ b/drivers/base/power/domain.c
> @@ -129,6 +129,7 @@ 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_is_suspend_on(genpd) (genpd->flags & GENPD_FLAG_SUSPEND_ON)
>
> static inline bool irq_safe_dev_in_no_sleep_domain(struct device *dev,
> const struct generic_pm_domain *genpd)
> @@ -949,7 +950,7 @@ static void genpd_sync_power_off(struct generic_pm_domain *genpd, bool use_lock,
> {
> struct gpd_link *link;
>
> - if (!genpd_status_on(genpd) || genpd_is_always_on(genpd))
> + if (!genpd_status_on(genpd) || genpd_is_always_on(genpd) || genpd_is_suspend_on(genpd))
> return;
>
> if (genpd->suspended_count != genpd->device_count
> diff --git a/include/linux/pm_domain.h b/include/linux/pm_domain.h
> index ee11502a575b0..3002a2d68936a 100644
> --- a/include/linux/pm_domain.h
> +++ b/include/linux/pm_domain.h
> @@ -55,6 +55,10 @@
> *
> * GENPD_FLAG_RPM_ALWAYS_ON: Instructs genpd to always keep the PM domain
> * powered on except for system suspend.
> + *
> + * GENPD_FLAG_SUSPEND_ON: Instructs genpd to keep the PM domain powered
> + * on during suspend and runtime PM controlled
> + * otherwise.
> */
> #define GENPD_FLAG_PM_CLK (1U << 0)
> #define GENPD_FLAG_IRQ_SAFE (1U << 1)
> @@ -62,6 +66,7 @@
> #define GENPD_FLAG_ACTIVE_WAKEUP (1U << 3)
> #define GENPD_FLAG_CPU_DOMAIN (1U << 4)
> #define GENPD_FLAG_RPM_ALWAYS_ON (1U << 5)
> +#define GENPD_FLAG_SUSPEND_ON (1U << 6)
>
> enum gpd_status {
> GPD_STATE_ACTIVE = 0, /* PM domain is active */
> --
> The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
> a Linux Foundation Collaborative Project
>

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