Re: [PATCH V6 0/7] cpufreq: suspend early/resume late: dpm_{suspend|resume}()

[Stephen Warren <swarren@wwwdotorg.org>]

On 02/17/2014 02:25 AM, Viresh Kumar wrote:
> This patchset creates/calls cpufreq suspend/resume callbacks from dpm_{suspend|resume}()
> for handling suspend/resume of cpufreq governors and core.
> 
> There are multiple problems that are fixed by this patch:
> - Nishanth Menon (TI) found an interesting problem on his platform, OMAP. His board
>   wasn't working well with suspend/resume as calls for removing non-boot CPUs
>   was turning out into a call to drivers ->target() which then tries to play
>   with regulators. But regulators and their I2C bus were already suspended and
>   this resulted in a failure. Many platforms have such problems, samsung, tegra,
>   etc.. They solved it with driver specific PM notifiers where they used to
>   disable their driver's ->target() routine.
> - Lan Tianyu (Intel) & Jinhyuk Choi (Broadcom) found an issue where tunables
>   configuration for clusters/sockets with non-boot CPUs was getting lost after
>   suspend/resume, as we were notifying governors with CPUFREQ_GOV_POLICY_EXIT on
>   removal of the last cpu for that policy and so deallocating memory for
>   tunables.  This is fixed by this patch as we don't allow any operation on
>   governors after device suspend and before device resume now.

The series,
Tested-by: Stephen Warren <swarren@nvidia.com>

Patch 7/7,
Acked-by: Stephen Warren <swarren@nvidia.com>