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@ti.com>
Signed-off-by: Vibhore Vardhan <vibhore@ti.com>
Signed-off-by: Kevin Hilman <khilman@baylibre.com>
Signed-off-by: Dhruva Gole <d-gole@ti.com>
---
 drivers/pmdomain/ti/ti_sci_pm_domains.c | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)

diff --git a/drivers/pmdomain/ti/ti_sci_pm_domains.c b/drivers/pmdomain/ti/ti_sci_pm_domains.c
index bb95c40ab3ea..1ab1e46924ab 100644
--- a/drivers/pmdomain/ti/ti_sci_pm_domains.c
+++ b/drivers/pmdomain/ti/ti_sci_pm_domains.c
@@ -74,6 +74,21 @@ static void ti_sci_pd_set_lat_constraint(struct device *dev, s32 val)
 			pd->idx, val);
 }
 
+static inline void ti_sci_pd_set_wkup_constraint(struct device *dev)
+{
+	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)
+			dev_dbg(dev, "ti_sci_pd: ID:%d set device constraint.\n", pd->idx);
+	}
+}
+
 /*
  * ti_sci_pd_power_off(): genpd power down hook
  * @domain: pointer to the powerdomain to power off
@@ -115,6 +130,8 @@ static int ti_sci_pd_suspend(struct device *dev)
 	if (ti_sci_pd_is_valid_constraint(val))
 		ti_sci_pd_set_lat_constraint(dev, val);
 
+	ti_sci_pd_set_wkup_constraint(dev);
+
 	return 0;
 }
 

-- 
2.46.0

On Fri, 6 Sept 2024 at 00:03, Kevin Hilman <khilman@baylibre.com> 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@ti.com>
> Signed-off-by: Vibhore Vardhan <vibhore@ti.com>
> Signed-off-by: Kevin Hilman <khilman@baylibre.com>
> Signed-off-by: Dhruva Gole <d-gole@ti.com>

Reviewed-by: Ulf Hansson <ulf.hansson@linaro.org>

Kind regards
Uffe

> ---
>  drivers/pmdomain/ti/ti_sci_pm_domains.c | 17 +++++++++++++++++
>  1 file changed, 17 insertions(+)
>
> diff --git a/drivers/pmdomain/ti/ti_sci_pm_domains.c b/drivers/pmdomain/ti/ti_sci_pm_domains.c
> index bb95c40ab3ea..1ab1e46924ab 100644
> --- a/drivers/pmdomain/ti/ti_sci_pm_domains.c
> +++ b/drivers/pmdomain/ti/ti_sci_pm_domains.c
> @@ -74,6 +74,21 @@ static void ti_sci_pd_set_lat_constraint(struct device *dev, s32 val)
>                         pd->idx, val);
>  }
>
> +static inline void ti_sci_pd_set_wkup_constraint(struct device *dev)
> +{
> +       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)
> +                       dev_dbg(dev, "ti_sci_pd: ID:%d set device constraint.\n", pd->idx);
> +       }
> +}
> +
>  /*
>   * ti_sci_pd_power_off(): genpd power down hook
>   * @domain: pointer to the powerdomain to power off
> @@ -115,6 +130,8 @@ static int ti_sci_pd_suspend(struct device *dev)
>         if (ti_sci_pd_is_valid_constraint(val))
>                 ti_sci_pd_set_lat_constraint(dev, val);
>
> +       ti_sci_pd_set_wkup_constraint(dev);
> +
>         return 0;
>  }
>
>
> --
> 2.46.0
>