timekeeping: utilize the suspend-nonstop clocksource to count suspended time

There are some new processors whose TSC clocksource won't stop during
suspend. Currently, after system resumes, kernel will use persistent
clock or RTC to compensate the sleep time, but with these nonstop
clocksources, we could skip the special compensation from external
sources, and just use current clocksource for time recounting.

This can solve some time drift bugs caused by some not-so-accurate or
error-prone RTC devices.

The current way to count suspended time is first try to use the persistent
clock, and then try the RTC if persistent clock can't be used. This
patch will change the trying order to:
	suspend-nonstop clocksource -> persistent clock -> RTC

When counting the sleep time with nonstop clocksource, use an accurate way
suggested by Jason Gunthorpe to cover very large delta cycles.

CRs-fixed: 536881
Change-Id: I59c21b1ce5ae81cebc8cf3e817d9b3f951302a3d
Signed-off-by: Feng Tang <feng.tang@intel.com>
[jstultz: Small optimization, avoiding re-reading the clocksource]
Signed-off-by: John Stultz <john.stultz@linaro.org>
Git-repo: git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
Git-commit: e445cf1c4257cc0238d72e4129eb4739f46fd3de)
[sboyd: Took tk and clock local variables]
Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>

Signed-off-by: franciscofranco <franciscofranco.1990@gmail.com>
clocksource: Add new feature flag CLOCK_SOURCE_SUSPEND_NONSTOP

Some x86 processors have a TSC clocksource, which continues to run
even when system is suspended. Also most OMAP platforms have a
32 KHz timer which has similar capability. Add a feature flag so that
it could be utilized.

CRs-fixed: 536881
Change-Id: I863678fec5a3021158240f2c5b144c552ba0b16a
Signed-off-by: Feng Tang <feng.tang@intel.com>
Signed-off-by: John Stultz <john.stultz@linaro.org>
Git-repo: git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
Git-commit: 5caf4636259ae3af0efbb9bfc4cd97874b547c7d
Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>
Signed-off-by: franciscofranco <franciscofranco.1990@gmail.com>
clocksource: arm_arch_timer: Use clocksource for suspend timekeeping

The ARM architected timers keep counting during suspend so we can
mark this clocksource with the CLOCK_SOURCE_SUSPEND_NONSTOP. This
flag will indicate that this clocksource can be used for
calculating suspend time and injecting sleep time into the
timekeeping core. This will usually be more accurate than using
an external RTC or architecture specific persistent clock.

CRs-fixed: 536881
Change-Id: I882bf19a87ceb642aa069bbf26802c66c96b4426
Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>
Signed-off-by: franciscofranco <franciscofranco.1990@gmail.com>
msm: pm-8x60: Fix suspend time tracking

Calls to sched_clock() after syscore devices have been suspend
will return the same value until the syscored devices are
resumed. Furthermore, the value won't jump forward to account for
the time left in suspend so we can't use it to calculate how much
time we spent in suspend.

We could expose the hardware directly to the pm code but it's
better to use generic interfaces. Move to using the timekeeping
APIs to determine how long we were in suspend. Unfortunately, we
can't use the timekeeping APIs this early in the resume path, so
we must read the current time of day before we suspend the
timekeeping core and after we resume the timekeeping core. Move
the calls to the suspend_late() and wake() callbacks so we can
properly read the amount of suspend time.

CRs-fixed: 536881
Change-Id: I3b47511afb75926e51e82fc83929f405404fbf07
Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>
Signed-off-by: franciscofranco <franciscofranco.1990@gmail.com>
Revert "iopoll: Use ktime_get() instead of jiffies for timeout calculations"

This reverts commit d2af4b62e8ff73290c3687c60a08685ebb1eafb6.
slim_msm_ngd: Add IPC logging support

Add IPC logging support for improved debugging
per device, and in memory to avoid using kernel
dmesg logs.

Logs are captured in four levels.
1) error level ---> All fatal errors are logged
2) warn level  ---> error level logs +
Warning messages are logged
3) Info level  ---> Error level +
warn level + the required information
for debugging is logged
4) Debug level ----> error level + warn level +
info level logs + extra information
for debugging are logged

Procedure to change the debug level at runtime:
==============================================
cd sys/devices/ctrl_num(eg:1234).slim
echo <log_level> > debug_mask

Procedure to collect the logs at run time:
=========================================
adb shell cat sys/kernel/debug/ipc_logging/ctrl_num.slim/log_cont
|tee slimbus.txt

CRs-Fixed: 645838
Change-Id: If183533472ee61b2d8cf458d228dd4ae2124dd37
Signed-off-by: Kiran Gunda <kgunda@codeaurora.org>
Signed-off-by: franciscofranco <franciscofranco.1990@gmail.com>
ngd_slim: Decouple clock pause from power down/up

NGD slimbus driver itself can never send out clock pause sequence
for slimbus protocol on the HW lines since it can only be sent by
a manager device (which is controlled by ADSP when NGD driver is
instantiated from apps side).
Previously, clock pause of slimbus framework was coupled with power
down/up. That is not correct, since manager device may or may not
decide to send clock-pause on the HW lines. (e.g. if apps is inactive,
but some client on ADSP is active, clock-pause sequence won't be sent
over the bus.
Decouple power-on/off from clock pause to avoid giving incorrect
impression to clients on apps side about clock-pause state. Mark
clock-pause as unsupported by setting wakup function pointer to NULL
instead since this controller on apps cannot send it on HW lines.

CRs-Fixed: 667165
Change-Id: I382bca153deb2fed1d0f0672adaebde1e122dc68
Signed-off-by: Sagar Dharia <sdharia@codeaurora.org>
Signed-off-by: franciscofranco <franciscofranco.1990@gmail.com>
mako_hotplug: fix styling.

Signed-off-by: franciscofranco <franciscofranco.1990@gmail.com>