tree f6d54e8ea3982ebae7285e2d284d588a63808eb1
parent 92e3ea955c918abc5f75bc52d16e57be2d249e74
author Saravana Kannan <skannan@codeaurora.org> 1373705349 -0700
committer Stephen Boyd <sboyd@codeaurora.org> 1490037364 -0700

cpufreq: cpu-boost: Add cpu-boost driver

When certain bursty and important events take place, it might take a while
for the current cpufreq governor to notice the new load and react to it.
That would result in poor user experience. To alleviate this, the cpu-boost
driver boosts the frequency of a CPU for a short duration to maintain good
user experience while the governor catches up.

Since this driver enforces the boost by hooking into standard cpufreq
ADJUST notifiers, it has several advantages:
- More portable across kernel versions where the cpufreq internals might
  have been rewritten.
- Governor agnostic and hence works with multiple governors like
  conservative, ondemand, interactive, etc.
- Does not affect the sampling period/logic of existing governors.
- Can have the boost period adjusted independent of governor sampling
  period.

Change-Id: Ibd814a20043d0aba64ee7637a4a79b9ffa1b0991
Signed-off-by: Saravana Kannan <skannan@codeaurora.org>
[rameezmustafa@codeaurora.org]: Port to msm-3.18]
Signed-off-by: Syed Rameez Mustafa <rameezmustafa@codeaurora.org>
[joonwoop@codeaurora.org: fixed conflict in drivers/cpufreq/Kconfig.]
Signed-off-by: Joonwoo Park <joonwoop@codeaurora.org>
Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>