Re: [PATCH] arm64: dts: qcom: hamoa/x1: fix idle exit latency

[Maulik Shah (mkshah)]

On 2/20/2026 3:11 PM, Konrad Dybcio wrote:
> On 2/20/26 8:02 AM, Daniel J Blueman wrote:
>> Designs based on the Qualcomm X1 Hamoa reference platform report:
>> driver: Idle state 1 target residency too low
>>
>> This is because the declared X1 idle entry plus exit latency of 680us
>> exceeds the declared minimum 600us residency time:
>>   entry-latency-us = <180>;
>>   exit-latency-us = <500>;
>>   min-residency-us = <600>;
>>
>> As 500us idle exit latency is overly conservative, fix this to be a more
>> realistic 200us, in range of similar silicon. Tested on a Lenovo Yoga Slim
>> 7x with Qualcomm X1E-80-100.
>>
>> Signed-off-by: Daniel J Blueman <daniel@xxxxxxxxx>
>> ---
>>  arch/arm64/boot/dts/qcom/hamoa.dtsi | 2 +-
>>  1 file changed, 1 insertion(+), 1 deletion(-)
>>
>> diff --git a/arch/arm64/boot/dts/qcom/hamoa.dtsi b/arch/arm64/boot/dts/qcom/hamoa.dtsi
>> index a17900eacb20..b870f4dc9c42 100644
>> --- a/arch/arm64/boot/dts/qcom/hamoa.dtsi
>> +++ b/arch/arm64/boot/dts/qcom/hamoa.dtsi
>> @@ -269,7 +269,7 @@ cluster_c4: cpu-sleep-0 {
>>  				idle-state-name = "ret";
>>  				arm,psci-suspend-param = <0x00000004>;
>>  				entry-latency-us = <180>;
>> -				exit-latency-us = <500>;
>> +				exit-latency-us = <200>;
>>  				min-residency-us = <600>;
> 
> +Maulik?
> 
> Konrad

Linux dt idle driver sums up entry & exit latency and displays final number as total exit latency at
/sys/devices/system/cpu/cpu*/cpuidle/state1/latency

Can you please keep 320 usec as exit-latency-us to match with downstream 500usec total exit latency number from cluster_c4 state.

Thanks,
Maulik