Hi, Geert,
On 30.08.2024 17:26, Geert Uytterhoeven wrote:
> Hi Claudiu,
>
> On Fri, Aug 30, 2024 at 4:07 PM claudiu beznea <claudiu.beznea@xxxxxxxxx> wrote:
>> On 30.08.2024 11:06, Geert Uytterhoeven wrote:
>>> On Fri, Aug 30, 2024 at 9:46 AM claudiu beznea <claudiu.beznea@xxxxxxxxx> wrote:
>>>> On 29.08.2024 15:32, Geert Uytterhoeven wrote:
>>>>> 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>
>>>
>>>>>> --- a/drivers/clk/renesas/rzg2l-cpg.c
>>>>>> +++ b/drivers/clk/renesas/rzg2l-cpg.c
>>>
>>>>>
>>>>>> 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.
>>>
>>> Still only to be done for the always-on domain, of course.
>>> Anyway, up to you.
>>
>> I checked your proposal. If unconditional power on is going to be done for
>> all the registered domains it may happen to register domains for which
>> there are no enabled nodes in device tree and thus the domains to remain on
>> (because the driver enables it under the hood and the genpd core doesn't
>> know about it).
>>
>> With unconditional power on and the current DTSes the following domains
>> remain on after booting with r9a08g045s33-smarc.dtb:
>> - sdhi2
>> - i2c2
>> - i2c3
>>
>> as the domains are registered and powered (while registered) but the nodes
>> are not enabled in DT.
>
> To make it clear: I did not suggest doing an unconditional power-on.
> I merely suggested moving the conditional power-on from
> rzg2l_cpg_add_pm_domains() to rzg2l_cpg_pd_setup().
Ah, I see. That can be done. Sorry for confusion.
Thank you,
Claudiu Beznea
>
> Gr{oetje,eeting}s,
>
> Geert
>
