Re: [PATCH v4 2/3] pmdomain: ti_sci: add wakeup constraint management

[Markus Schneider-Pargmann]

On Fri, Sep 06, 2024 at 09:14:50AM GMT, Kevin Hilman wrote:
> 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@xxxxxx>
> Signed-off-by: Vibhore Vardhan <vibhore@xxxxxx>
> Reviewed-by: Ulf Hansson <ulf.hansson@xxxxxxxxxx>
> Tested-by: Dhruva Gole <d-gole@xxxxxx>
> Signed-off-by: Kevin Hilman <khilman@xxxxxxxxxxxx>

Reviewed-by: Markus Schneider-Pargmann <msp@xxxxxxxxxxxx>

Best
Markus

> ---
>  drivers/pmdomain/ti/ti_sci_pm_domains.c | 17 +++++++++++++++++
>  1 file changed, 17 insertions(+)
> 
> diff --git a/drivers/pmdomain/ti/ti_sci_pm_domains.c b/drivers/pmdomain/ti/ti_sci_pm_domains.c
> index bb95c40ab3ea..1ab1e46924ab 100644
> --- a/drivers/pmdomain/ti/ti_sci_pm_domains.c
> +++ b/drivers/pmdomain/ti/ti_sci_pm_domains.c
> @@ -74,6 +74,21 @@ static void ti_sci_pd_set_lat_constraint(struct device *dev, s32 val)
>  			pd->idx, val);
>  }
>  
> +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
> @@ -115,6 +130,8 @@ 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;
>  }
>  
> 
> -- 
> 2.46.0
>