[PATCH 0/4][Bionic][SRU Artful] Add support for PCC subspace IDs to the ACPI CPPC driver

dann frazier dann.frazier at canonical.com
Thu Feb 1 15:53:39 UTC 2018


On Mon, Jan 29, 2018 at 7:17 AM, Seth Forshee
<seth.forshee at canonical.com> wrote:
> On Tue, Jan 23, 2018 at 12:29:43PM -0700, dann frazier wrote:
>> BugLink: https://bugs.launchpad.net/bugs/1745007
>>
>> This is required for supporting Cavium ThunderX2 systems. All clean
>> cherry-picks from upstream.
>
> From the SRU justifcation on the bug - "Regressions would therefore be
> restricted to platforms that support ACPI CPPC power management." Do you
> know which archtectures that would affect?

The cppc-cpufreq driver is ARM-only, but the underlying CPPC code is
also used by the intel-pstate driver.

> If this includes any besides
> arm64, has any regression testing been done on those?

Now it has - I've tested on my laptop (fiddling with settings under
/sys/devices/system/cpu/intel_pstate), and observed no regression.

  -dann




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