Hi, Geert,
On 29.08.2024 15:32, Geert Uytterhoeven wrote:
> Hi Claudiu,
>
> On Wed, Aug 28, 2024 at 4:06 PM Claudiu <claudiu.beznea@xxxxxxxxx> wrote:
>> From: Claudiu Beznea <claudiu.beznea.uj@xxxxxxxxxxxxxx>
>>
>> For watchdog PM domain it is necessary to provide GENPD_FLAG_IRQ_SAFE flag
>> to be able to power on the watchdog PM domain from atomic context. For
>> this, adjust the current infrastructure to be able to provide GENPD_FLAG_*
>> for individual PM domains.
>>
>> Signed-off-by: Claudiu Beznea <claudiu.beznea.uj@xxxxxxxxxxxxxx>
>
> Thanks for your patch!
>
>> --- a/drivers/clk/renesas/rzg2l-cpg.c
>> +++ b/drivers/clk/renesas/rzg2l-cpg.c
>> @@ -1680,11 +1680,13 @@ static int rzg2l_cpg_power_off(struct generic_pm_domain *domain)
>> return 0;
>> }
>>
>> -static int __init rzg2l_cpg_pd_setup(struct rzg2l_cpg_pd *pd, bool always_on)
>> +static int __init rzg2l_cpg_pd_setup(struct rzg2l_cpg_pd *pd, u32 genpd_flags,
>> + bool always_on)
>
> You don't need always_on, as that should already be reflected in
> genpd_flags.
OK.
>
> Also, you could do without passing genpd_flags, if the caller would have
> initialized pd->genpd.flags (it already initializes pd->genpd.name).
That could be done, indeed.
>
>> {
>> struct dev_power_governor *governor;
>>
>> - pd->genpd.flags |= GENPD_FLAG_PM_CLK | GENPD_FLAG_ACTIVE_WAKEUP;
>> + pd->genpd.flags |= GENPD_FLAG_PM_CLK | GENPD_FLAG_ACTIVE_WAKEUP |
>> + genpd_flags;
>
> Change not needed if the caller would have initialized flags.
OK
>
>> pd->genpd.attach_dev = rzg2l_cpg_attach_dev;
>> pd->genpd.detach_dev = rzg2l_cpg_detach_dev;
>> if (always_on) {
>
> The next line is
>
> pd->genpd.flags |= GENPD_FLAG_ALWAYS_ON;
>
> which should already be the case if always_on is true, so it can
> be removed.
OK
>
>> @@ -1712,7 +1714,7 @@ static int __init rzg2l_cpg_add_clk_domain(struct rzg2l_cpg_priv *priv)
>>
>> pd->genpd.name = np->name;
>
> pd->genpd.flags = GENPD_FLAG_ALWAYS_ON;
Agree.
>
>> pd->priv = priv;
>> - ret = rzg2l_cpg_pd_setup(pd, true);
>> + ret = rzg2l_cpg_pd_setup(pd, 0, true);
>
> s/0/GENPD_FLAG_ALWAYS_ON/, FWIW ;-)
>
>> if (ret)
>> return ret;
>>
>> @@ -1777,7 +1779,8 @@ static int __init rzg2l_cpg_add_pm_domains(struct rzg2l_cpg_priv *priv)
>> return ret;
>>
>> for (unsigned int i = 0; i < info->num_pm_domains; i++) {
>> - bool always_on = !!(info->pm_domains[i].flags & RZG2L_PD_F_ALWAYS_ON);
>> + u32 genpd_flags = info->pm_domains[i].genpd_flags;
>> + bool always_on = !!(genpd_flags & GENPD_FLAG_ALWAYS_ON);
>> struct rzg2l_cpg_pd *pd;
>>
>> pd = devm_kzalloc(dev, sizeof(*pd), GFP_KERNEL);
>> @@ -1789,7 +1792,7 @@ static int __init rzg2l_cpg_add_pm_domains(struct rzg2l_cpg_priv *priv)
>
> You can add
>
> pd->genpd.flags = info->pm_domains[i].genpd_flags;
>
> above.
OK
>
>> pd->id = info->pm_domains[i].id;
>> pd->priv = priv;
>>
>> - ret = rzg2l_cpg_pd_setup(pd, always_on);
>> + ret = rzg2l_cpg_pd_setup(pd, genpd_flags, always_on);
>> if (ret)
>> return ret;
>
> What about moving the conditional call to rzg2l_cpg_power_on()
> below to rzg2l_cpg_pd_setup()? Then this function no longer needs
> the always_on flag.
That could be done but I think it will involve an extra power on/power off
cycle for the unused domains.
Thank you for your review,
Claudiu Beznea
>
> Gr{oetje,eeting}s,
>
> Geert
>
> --
> Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@xxxxxxxxxxxxxx
>
> In personal conversations with technical people, I call myself a hacker. But
> when I'm talking to journalists I just say "programmer" or something like that.
> -- Linus Torvalds
