On 2013年11月25日 22:11, Viresh Kumar wrote: > This patchset adds cpufreq callbacks to dpm_{suspend|resume}() for handling > suspend/resume of cpufreq governors and core. This is required for early suspend > and late resume of governors and cpufreq 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. Most of these are updated in this > patchset to use new infrastructure. > > - 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. This is also fixed with this patch as don't > allow any operation on Governors during suspend/resume now. > > > So to solve these issues we introduce early suspend and late resume callbacks > which would remove need of cpufreq drivers to implement PM notifiers to disable > transition after suspend and before resume. > > @Nishanth: Can you please test V2 as well and confirm that suspend_noirq() > doesn't work for you. I am sure it will not, but would be better if you confirm > that. > > Viresh Kumar (6): > cpufreq: suspend governors on system suspend/hibernate > cpufreq: call driver's suspend/resume for each policy > cpufreq: Implement cpufreq_generic_suspend() > cpufreq: exynos: Use cpufreq_generic_suspend() > cpufreq: s5pv210: Use cpufreq_generic_suspend() > cpufreq: Tegra: Use cpufreq_generic_suspend() > Patch 1-2, Tested-by: Lan Tianyu <tianyu.lan@xxxxxxxxx> > drivers/base/power/main.c | 5 ++ > drivers/cpufreq/cpufreq.c | 133 +++++++++++++++++++++----------------- > drivers/cpufreq/exynos-cpufreq.c | 97 ++------------------------- > drivers/cpufreq/s5pv210-cpufreq.c | 49 +------------- > drivers/cpufreq/tegra-cpufreq.c | 54 ++-------------- > include/linux/cpufreq.h | 6 ++ > 6 files changed, 99 insertions(+), 245 deletions(-) > -- Best regards Tianyu Lan -- To unsubscribe from this list: send the line "unsubscribe linux-tegra" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html