cpufreq: interactive: rollback in preparation of cleanup

Revert "cpufreq: interactive: Remove unnecessary cpu_online() check"

This reverts commit 735b2856e34fa013e719417296e638b9e12bc74b.

Revert "cpufreq: interactive: fix merge error"

This reverts commit 7d28355a79f0d87d3af68d533600daf6ba0b5e79.

Revert "cpufreq: interactive: Fix race in sync freq feature"

This reverts commit f6e8dc7aab2d8a2e27469b50d7eb21dcad897d4c.

Revert "cpufreq: interactive: Optimize sync_freq implementation"

This reverts commit 09a2255a029c9c0cca91bbf33910dbe353c21596.

Revert "cpufreq: interactive: fix compiling warnings"

This reverts commit ddd328fddc800386a2991affb95a8e5dee854eff.
cpufreq: interactive: Remove unnecessary cpu_online() check

Cpufreq no longer calls governor callback for offlined cpus. i.e. All
policy->cpus are guaranteed to be online. Hence we don't need explicit check to
see if cpu is online or not.

Change-Id: I9ad85ea4addd5b4a40952e59ed730dd15e328690
Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
cpufreq: interactive: Move definition of cpufreq_gov_interactive downwards

This moves definition of cpufreq_gov_interactive towards the bottom of file, so
that we don't have to add prototype of cpufreq_governor_interactive() in the
beginning of file.

Change-Id: I04bd1004954eb36502c5cd7e35d3d7274cddaf95
Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
Git-commit: e50d640cacfe61e69f1b4fa92fa0174c688e919c
Git-Repo: https://android.googlesource.com/kernel/common.git
[junjiew@codeaurora.org: Resolve merge conflicts]
Signed-off-by: Junjie Wu <junjiew@codeaurora.org>
cpufreq: interactive: Squashed cleanup patches

Revert "cpufreq: interactive: Remove unnecessary cpu_online() check"

This reverts commit 7b46e2e6d8a3c3c32706ee3c3c3b507d050bedfb.

Revert "cpufreq: interactive: Allow 1 ms error in above_hispeed_delay comparisons"

This reverts commit ff6af80775231f1dfab8353d0b665718222218bf.

Commit ff6af807 tries to avoid a corner case where frequency is stuck in
hispeed_freq for one additional window. For example, if timer_rate is
20ms, and go_hispeed_delay is 40ms, frequency might be stuck at
hispeed_freq for 60ms due to imprecision in jiffies. Same problem can be
easily solved by making go_hispeed_delay 1ms smaller instead of changing
the code.

Signed-off-by: Junjie Wu <junjiew@codeaurora.org>

cpufreq: interactive: Revert timer start modification

commit f8b276565ce95bd788af0fc8d060f92632590a40
(cpufreq: Sync on thread migration optimizations)
introduced a change to cpufreq_interactive_timer_start() in order
to reschedule the timer differently based on whether min or max
is changed. A better way is to reschedule the timer only when
necessary.

Revert timer start modification in preparation for the final fix.

Signed-off-by: Junjie Wu <junjiew@codeaurora.org>

Revert "cpufreq: interactive: Optimize sync_freq implementation"

This reverts commit 4da7f27d4dbd5bcfb8479467444f2cf198217933.

cpufreq: interactive: Revert sync on thread migration optimizations

Commit f8b276565ce95bd788af0fc8d060f92632590a40
(cpufreq: Sync on thread migration optimizations) is no longer needed
for targets with synchronous CPUs.

Part of that commit has already been reverted in
a913b3afcaa55356f5f793ae895312c8ae7e1f71
(cpufreq: interactive: Revert timer start modification)

This commit reverts the remaining changes.

Signed-off-by: Junjie Wu <junjiew@codeaurora.org>

cpufreq: interactive: Revert sync freq feature

Sync freq feature is not valid for a HMP system with clusters.

This commit reverts commit f3d1980b4db4c20f21acaed59cc511c2df84cec2
(cpufreq: interactive: sync freq feature for interactive governor)

Signed-off-by: Junjie Wu <junjiew@codeaurora.org>

cpufreq: interactive: Remove sampling_down_factor

Remove sampling_down_factor feature.

This commit revert d094d23694edf41fee50ebc544795d6116451643
(cpufreq: interactive: Add a sampling_down_factor for max frequencies)
and subsequent modifications related to sampling down factor.

Signed-off-by: Junjie Wu <junjiew@codeaurora.org>

Conflicts:
	drivers/cpufreq/cpufreq_interactive.c

Change-Id: I9e5fd451e7eaefe8ef7775365cc5a4527d37188f
cpufreq: interactive: Align timer windows for all CPUs

It's more advantageous to evaluate all CPUs at same time so that
interactive governor gets a complete picture of the load on
each CPU at a specific time. It could also reduce number of speed
changes made if there are many CPUs controlled by same policy. In
addition, waking up all CPUs at same time would allow the cluster
to go into a deeper sleep state when it's idle.

Change-Id: I6915050c5339ef1af106eb906ebe4b7c618061e2
Signed-off-by: Junjie Wu <junjiew@codeaurora.org>
cpufreq: interactive: Reset last evaluated jiffy in idle callback

When CPU has been busy for a long time, last evaluated jiffy will be
quite behind because the timer would have been canceled. We don't want
to schedule a timer to fire in the past as load will always be 100%.

Reset last evaluated jiffy so that timer will be scheduled for the
next window.

Change-Id: Ie25e65eab1f16acdeda267987ca605d653f1f32a
Signed-off-by: Junjie Wu <junjiew@codeaurora.org>
cpufreq: interactive: Round up timer_rate to match jiffy

Timers are scheduled in unit of jiffies. Round up timer_rate so that
it matches the actual sampling period.

Change-Id: I47e666f835752528331f50b1e76784e6d67f8bcf
Signed-off-by: Junjie Wu <junjiew@codeaurora.org>
cpufreq: interactive: Use del_timer/add_timer_on to rearm timers

Replace mod_timer_pinned() with del_timer(), add_timer_on().
mod_timer_pinned() always adds timer onto current CPU. Interactive
governor expects each CPU's timers to be running on the same CPU.
If cpufreq_interactive_timer_resched() is called from another CPU,
the timer will be armed on the wrong CPU.

Replacing mod_timer_pinned() with del_timer() and add_timer_on()
guarantees timers are still run on the right CPU even if another
CPU reschedules the timer. This would provide more flexibility
for future changes.

Change-Id: I3a10be37632afc0ea4e0cc9c86323b9783b216b1
Signed-off-by: Junjie Wu <junjiew@codeaurora.org>
msm: msm-pm: remove clock_debug dependencies
This was leftover after commit b9b2da28b68241f9f9730a4131f660a06bafe1e8
zombie_togari_defconfig: enable BFQ, set as default