pmdomain: core: Allow a non-CPU device in a CPU PM domain to do power on

A driver for a non-CPU device that is attached to a CPU PM domain (the
genpd has the GENPD_FLAG_CPU_DOMAIN configuration set), is currently not
able to power on the PM domain. More precisely, to power on a CPU PM domain
one of its corresponding CPUs needs to be woken up if they are idle.

The current support for a non-CPU device is that its driver can only
prevent an already powered on CPU PM domain from being powered off. This
leads to problems for a driver while probing its device or when it needs to
call pm_runtime_get_sync() to turn on the power for it. From the driver
point of view it looks like it all works fine, but when accessing the
device it may end up with various errors as the device may not be fully
powered on.

To fix the behavior for these types of devices, let's adjust the behaviour
in genpd_power_on() to wake up an idle CPU that belongs to it, in cases
when it's needed.

Link: https://lore.kernel.org/all/CAPx+jO-sCierYj8jnoKQHckJG16dOBxnNrsZVYO=38R2cLV8nw@mail.gmail.com/
Reviewed-by: Abel Vesa <abel.vesa@oss.qualcomm.com>
Tested-by: Yuanfang Zhang <yuanfang.zhang@oss.qualcomm.com>
Reviewed-by: Dhruva Gole <goledhruva@gmail.com>
Signed-off-by: Ulf Hansson <ulf.hansson@oss.qualcomm.com>
Signed-off-by: Ulf Hansson <ulfh@kernel.org>

0 files changed, 0 insertions, 0 deletions