On Wed, 21 Jun 2023 at 16:40, Abel Vesa <abel.vesa@xxxxxxxxxx> wrote:
>
> For every provider that doesn't register a sync_state callback,
> register a generic one. This new generic sync_state callback queues up a
> power off request.
>
> Signed-off-by: Abel Vesa <abel.vesa@xxxxxxxxxx>
> ---
> drivers/base/power/domain.c | 23 +++++++++++++++++++++++
> include/linux/pm_domain.h | 3 +++
> 2 files changed, 26 insertions(+)
>
> diff --git a/drivers/base/power/domain.c b/drivers/base/power/domain.c
> index 5967ade160e2..ec16db0599ac 100644
> --- a/drivers/base/power/domain.c
> +++ b/drivers/base/power/domain.c
> @@ -654,6 +654,27 @@ static void genpd_queue_power_off_work(struct generic_pm_domain *genpd)
> queue_work(pm_wq, &genpd->power_off_work);
> }
>
> +/**
> + * pm_genpd_power_off_unused_sync_state - Power off all domains for provider.
> + * @dev: Provider's device.
> + *
> + * Request power off for all unused domains of the provider.
> + * This should be used exclusively as sync state callback for genpd providers.
> + */
> +void pm_genpd_power_off_unused_sync_state(struct device *dev)
> +{
> + struct generic_pm_domain *genpd;
> +
> + mutex_lock(&gpd_list_lock);
> +
> + list_for_each_entry(genpd, &gpd_list, gpd_list_node)
> + if (genpd->provider && genpd->provider->dev == dev)
Not all genpds have the ->provider assigned. Moreover, the
of_genpd_mutex is protecting the list of providers, we should use that
instead.
> + genpd_queue_power_off_work(genpd);
> +
> + mutex_unlock(&gpd_list_lock);
> +}
> +EXPORT_SYMBOL_GPL(pm_genpd_power_off_unused_sync_state);
Why does this need to be exported? Is there a provider that assigns
it's own sync state callback that needs to call this? If that is the
case, I would prefer to see a user of this API as a part of the series
too.
> +
> /**
> * genpd_keep_on - Tells if the domain should skip the power 'off' request
> * @genpd: PM domain to be checked.
> @@ -2329,6 +2350,8 @@ static int genpd_add_provider(struct device_node *np, genpd_xlate_t xlate,
> cp->xlate = xlate;
> fwnode_dev_initialized(&np->fwnode, true);
>
> + dev_set_drv_sync_state(np->fwnode.dev, pm_genpd_power_off_unused_sync_state);
> +
> mutex_lock(&of_genpd_mutex);
> list_add(&cp->link, &of_genpd_providers);
> mutex_unlock(&of_genpd_mutex);
> diff --git a/include/linux/pm_domain.h b/include/linux/pm_domain.h
> index 3eb32c4b6d4f..78164244b89f 100644
> --- a/include/linux/pm_domain.h
> +++ b/include/linux/pm_domain.h
> @@ -279,6 +279,9 @@ static inline int pm_genpd_remove(struct generic_pm_domain *genpd)
> return -EOPNOTSUPP;
> }
>
> +static inline void pm_genpd_power_off_unused_sync_state(struct device *dev)
> +{ }
> +
> static inline int dev_pm_genpd_set_performance_state(struct device *dev,
> unsigned int state)
> {
Kind regards
Uffe
