[PATCH v6 5/5] ACPI : enable ACPI_PROCESSOR_IDLE on ARM64
sudeep.holla at arm.com
Mon Jun 27 08:03:31 PDT 2016
On 27/06/16 15:33, Daniel Lezcano wrote:
> On 06/14/2016 04:48 PM, Sudeep Holla wrote:
>> Now that ACPI processor idle driver supports LPI(Low Power Idle), lets
>> enable ACPI_PROCESSOR_IDLE for ARM64 too.
>> This patch just removes the IA64 and X86 dependency on
>> Cc: linux-arm-kernel at lists.infradead.org
>> Cc: "Rafael J. Wysocki" <rjw at rjwysocki.net>
>> Signed-off-by: Sudeep Holla <sudeep.holla at arm.com>
> Hi Sudeep,
> now that ACPI processor supports ARM64 did you check the
> CPUIDLE_DRIVER_STATE_START trick in the code and its derivative ?
No, that is used only for C-State and ARM64 doesn't support it.
Patch 1/5 puts all the C-State code under #ifdef so that it's not
compiled on ARM64.
> I deleted the patch 2/5 but there is a place where:
Sorry, I don't follow what you mean by that.
> if (max_cstate=0)
> Probably this is because the POLL state is inserted, so there is always
> an idle state. But for ARM, that is not the case.
> Also, there are some places where the idle state index begins to 1. I
> think it should be 0 for ARM.
Yes for LPI, it does start from 0.
More information about the linux-arm-kernel