Re: [PATCH v2 5/9] irqchip/irq-qcom-mpm: Program wakeup timer when CPU cluster goes to LPM

[Sneh Mankad <sneh.mankad@oss.qualcomm.com>]

On 19-10-2026 17:26, Konrad Dybcio wrote:
> On 10/15/26 11:55 AM, Sneh Mankad wrote:
>> The next wakeup timer value needs to be set in MPM timer as the arch timer
>> interrupt can not wakeup the SoC if after the deepest CPUidle states the
>> SoC also enters deepest low power state.
>>
>> To wakeup the SoC in such scenarios the earliest wakeup time is set in MPM
>> timer and the Resource Power Manager (RPM processor) takes care of setting
>> the timer in HW.
>>
>> Add MPM timer programming when CPU cluster enters power collapse.
>>
>> Signed-off-by: Sneh Mankad <sneh.mankad@oss.qualcomm.com>
>> ---
> 
> [...]
> 
>> +static void mpm_write_next_wakeup(struct qcom_mpm_priv *priv)
>> +{
>> +	ktime_t now, wakeup = KTIME_MAX;
>> +	u64 wakeup_us, wakeup_cycles = ~0;
>> +	u32 lo, hi;
>> +
>> +	/* Set highest time when system (timekeeping) is suspended */
>> +	if (system_state == SYSTEM_SUSPEND)
>> +		goto exit;
>> +
>> +	/* Find the relative wakeup in kernel time scale */
>> +	wakeup = dev_pm_genpd_get_next_hrtimer(priv->dev);
> 
> This returns KTIME_MAX after the DT patches in this series are merged
> (because there's no power_domain that the MPM hangs off of anymore)

Yes that is true, thanks for pointing out. Perhaps we will revisit the timer changes
once we manage to add MPM device under CPU cluster power domain without blocking cluster
LPMs. For now will drop them from revised series.

Thanks,
Sneh