On 11/22/2013 05:29 AM, Viresh Kumar wrote:
> This patch adds cpufreq callbacks to dpm_{suspend|resume}_noirq() for handling
> suspend/resume of cpufreq governors. This is required for early suspend and
> late
> resume of governors.
>
> 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. This is why we need a PM notifier here.
> - Lan Tianyu (Intel) & Jinhyuk Choi (Broadcom) found another 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.
>
> Reported-by: Lan Tianyu <[email protected]>
> Reported-by: Nishanth Menon <[email protected]>
> Reported-by: Jinhyuk Choi <[email protected]>
> Signed-off-by: Viresh Kumar <[email protected]>
> ---
> drivers/base/power/main.c | 3 +++
> drivers/cpufreq/cpufreq.c | 62
> +++++++++++++++++++++++++++++++++++++++++++++++
> include/linux/cpufreq.h | 3 +++
> 3 files changed, 68 insertions(+)
yes, this seems to work for me as well.
http://pastebin.mozilla.org/3670909 - no cpufreq attempts to
transition were triggered.
--
Regards,
Nishanth Menon
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