Re: [PATCH 2/3] pmdomain: ti_sci: add wakeup constraint management

From: Markus Schneider-Pargmann
Date: Tue Aug 06 2024 - 04:19:03 EST


On Mon, Aug 05, 2024 at 04:38:40PM GMT, Kevin Hilman wrote:
> During system-wide suspend, check all devices connected to PM domain
> to see if they are wakeup-enabled. If so, set a TI SCI device
> constraint.
>
> Note: DM firmware clears all constraints on resume.
>
> Co-developed-by: Vibhore Vardhan <vibhore@xxxxxx>
> Signed-off-by: Vibhore Vardhan <vibhore@xxxxxx>
> Signed-off-by: Kevin Hilman <khilman@xxxxxxxxxxxx>
> Signed-off-by: Dhruva Gole <d-gole@xxxxxx>
> ---
> drivers/pmdomain/ti/ti_sci_pm_domains.c | 23 +++++++++++++++++++++++
> 1 file changed, 23 insertions(+)
>
> diff --git a/drivers/pmdomain/ti/ti_sci_pm_domains.c b/drivers/pmdomain/ti/ti_sci_pm_domains.c
> index 4dc48a97f9b8..7cd6ae957289 100644
> --- a/drivers/pmdomain/ti/ti_sci_pm_domains.c
> +++ b/drivers/pmdomain/ti/ti_sci_pm_domains.c
> @@ -51,6 +51,7 @@ struct ti_sci_pm_domain {
> struct ti_sci_genpd_provider *parent;
> s32 lat_constraint;
> bool constraint_sent;
> + bool wkup_constraint;
> };
>
> #define genpd_to_ti_sci_pd(gpd) container_of(gpd, struct ti_sci_pm_domain, pd)
> @@ -87,6 +88,26 @@ static inline void ti_sci_pd_clear_constraints(struct device *dev)
>
> pd->lat_constraint = PM_QOS_RESUME_LATENCY_NO_CONSTRAINT;
> pd->constraint_sent = false;
> + pd->wkup_constraint = false;
> +}
> +
> +static inline bool ti_sci_pd_check_wkup_constraint(struct device *dev)

'check' in the function name sounds like a passive function. Maybe
ti_sci_pd_send_wkup_constraint() would indicate its purpose better?

> +{
> + struct generic_pm_domain *genpd = pd_to_genpd(dev->pm_domain);
> + struct ti_sci_pm_domain *pd = genpd_to_ti_sci_pd(genpd);
> + const struct ti_sci_handle *ti_sci = pd->parent->ti_sci;
> + int ret;
> +
> + if (device_may_wakeup(dev)) {
> + ret = ti_sci->ops.pm_ops.set_device_constraint(ti_sci, pd->idx,
> + TISCI_MSG_CONSTRAINT_SET);
> + if (!ret) {
> + pd->wkup_constraint = true;
> + dev_dbg(dev, "ti_sci_pd: ID:%d set device constraint.\n", pd->idx);
> + }
> + }
> +
> + return pd->wkup_constraint;

Is this return value used anywhere?

Best
Markus

> }
>
> /*
> @@ -158,6 +179,8 @@ static int ti_sci_pd_suspend(struct device *dev)
> }
> pd->lat_constraint = val;
>
> + ti_sci_pd_check_wkup_constraint(dev);
> +
> return 0;
> }
>
>
> --
> 2.46.0
>