pmdomain: ti_sci: add wakeup constraint management

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>
Reviewed-by: Ulf Hansson <ulf.hansson@linaro.org>
Tested-by: Dhruva Gole <d-gole@ti.com>
Signed-off-by: Kevin Hilman <khilman@baylibre.com>
Reviewed-by: Dhruva Gole <d-gole@ti.com>
Message-ID: <20241206-lpm-v6-10-constraints-pmdomain-v6-2-833980158c68@baylibre.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>

diff --git a/drivers/pmdomain/ti/ti_sci_pm_domains.c b/drivers/pmdomain/ti/ti_sci_pm_domains.c
index 0c75cff1ee2d42ba09dea95820ed86232ca3e26c..3249656d4dc1e637c66b189590afc39e2a7264ee 100644 (file)
--- a/drivers/pmdomain/ti/ti_sci_pm_domains.c
+++ b/drivers/pmdomain/ti/ti_sci_pm_domains.c
@@ -79,6 +79,21 @@ static void ti_sci_pd_set_lat_constraint(struct device *dev, s32 val)
 }
 #endif
 
+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
@@ -121,6 +136,8 @@ 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;
 }
 #else