| Message ID | 20191211154343.29765-12-ulf.hansson@linaro.org (mailing list archive) |
|---|---|
| State | Not Applicable, archived |
| Headers | show |
| Series | cpuidle: psci: Support hierarchical CPU arrangement | expand |
On Wed, Dec 11, 2019 at 04:43:40PM +0100, Ulf Hansson wrote: > In case we have succeeded to attach a CPU to its PM domain, let's deploy > runtime PM support for the corresponding attached device, to allow the CPU > to be powered-managed accordingly. > > The triggering point for when runtime PM reference counting should be done, > has been selected to the deepest idle state for the CPU. However, from the > hierarchical point view, there may be good reasons to do runtime PM > reference counting even on shallower idle states, but at this point this > isn't supported, mainly due to limitations set by the generic PM domain. Reviewed-by: Sudeep Holla <sudeep.holla@arm.com> -- Regards, Sudeep
diff --git a/drivers/cpuidle/cpuidle-psci.c b/drivers/cpuidle/cpuidle-psci.c index 9600fe674a89..6e7804e697ed 100644 --- a/drivers/cpuidle/cpuidle-psci.c +++ b/drivers/cpuidle/cpuidle-psci.c @@ -16,6 +16,7 @@ #include <linux/of.h> #include <linux/of_device.h> #include <linux/psci.h> +#include <linux/pm_runtime.h> #include <linux/slab.h> #include <asm/cpuidle.h> @@ -51,14 +52,21 @@ static int psci_enter_domain_idle_state(struct cpuidle_device *dev, { struct psci_cpuidle_data *data = this_cpu_ptr(&psci_cpuidle_data); u32 *states = data->psci_states; - u32 state = psci_get_domain_state(); + struct device *pd_dev = data->dev; + u32 state; int ret; + /* Do runtime PM to manage a hierarchical CPU toplogy. */ + pm_runtime_put_sync_suspend(pd_dev); + + state = psci_get_domain_state(); if (!state) state = states[idx]; ret = psci_enter_state(idx, state); + pm_runtime_get_sync(pd_dev); + /* Clear the domain state to start fresh when back from idle. */ psci_set_domain_state(0); return ret;
In case we have succeeded to attach a CPU to its PM domain, let's deploy runtime PM support for the corresponding attached device, to allow the CPU to be powered-managed accordingly. The triggering point for when runtime PM reference counting should be done, has been selected to the deepest idle state for the CPU. However, from the hierarchical point view, there may be good reasons to do runtime PM reference counting even on shallower idle states, but at this point this isn't supported, mainly due to limitations set by the generic PM domain. Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org> --- Changes in v4: - None. --- drivers/cpuidle/cpuidle-psci.c | 10 +++++++++- 1 file changed, 9 insertions(+), 1 deletion(-)