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pmdomain: core: Allow power-off for out-of-band wakeup-capable devices

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Currently, if a device is configured as a system wakeup source, the PM
domain core avoids powering off its power domain during system-wide
suspend. However, this can lead to unnecessary power consumption,
especially for devices whose wakeup logic resides in an always-on domain,
i.e., devices with out-of-band wakeup capability.

To address this, add a check for device_out_band_wakeup() in
genpd_finish_suspend(). If the device supports out-of-band wakeup, its
power domain can be safely powered off, just like regular devices without
wakeup enabled. And same check in genpd_finish_resume().

This change improves power efficiency without compromising wakeup
functionality.

Signed-off-by: Peng Fan <peng.fan@nxp.com>
Reviewed-by: Dhruva Gole <d-gole@ti.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
This commit is contained in:
Peng Fan 2025-09-22 10:21:07 +08:00 committed by Ulf Hansson
parent 4acbfb6c11
commit 3b7685da41
1 changed files with 4 additions and 2 deletions
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6
drivers/pmdomain/core.c
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@ -1545,7 +1545,8 @@ static int genpd_finish_suspend(struct device *dev,
if (ret)
return ret;
if (device_awake_path(dev) && genpd_is_active_wakeup(genpd))
if (device_awake_path(dev) && genpd_is_active_wakeup(genpd) &&
!device_out_band_wakeup(dev))
return 0;
if (genpd->dev_ops.stop && genpd->dev_ops.start &&
@ -1600,7 +1601,8 @@ static int genpd_finish_resume(struct device *dev,
if (IS_ERR(genpd))
return -EINVAL;
if (device_awake_path(dev) && genpd_is_active_wakeup(genpd))
if (device_awake_path(dev) && genpd_is_active_wakeup(genpd) &&
!device_out_band_wakeup(dev))
return resume_noirq(dev);
genpd_lock(genpd);