linux/drivers/cpuidle
Sudeep Holla 194fe6f28e drivers: cpuidle: Don't initialize big.LITTLE driver if MCPM is unavailable
If big.LITTLE driver is initialized even when MCPM is unavailable,
we get the below warning the first time cpu tries to enter deeper
C-states.

------------[ cut here ]------------
WARNING: CPU: 4 PID: 0 at kernel/arch/arm/common/mcpm_entry.c:130 mcpm_cpu_suspend+0x6d/0x74()
Modules linked in:
CPU: 4 PID: 0 Comm: swapper/4 Not tainted 3.19.0-rc3-00007-gaf5a2cb1ad5c-dirty #11
Hardware name: ARM-Versatile Express
[<c0013fa5>] (unwind_backtrace) from [<c001084d>] (show_stack+0x11/0x14)
[<c001084d>] (show_stack) from [<c04fe7f1>] (dump_stack+0x6d/0x78)
[<c04fe7f1>] (dump_stack) from [<c0020645>] (warn_slowpath_common+0x69/0x90)
[<c0020645>] (warn_slowpath_common) from [<c00206db>] (warn_slowpath_null+0x17/0x1c)
[<c00206db>] (warn_slowpath_null) from [<c001cbdd>] (mcpm_cpu_suspend+0x6d/0x74)
[<c001cbdd>] (mcpm_cpu_suspend) from [<c03c6919>] (bl_powerdown_finisher+0x21/0x24)
[<c03c6919>] (bl_powerdown_finisher) from [<c001218d>] (cpu_suspend_abort+0x1/0x14)
[<c001218d>] (cpu_suspend_abort) from [<00000000>] (  (null))
---[ end trace d098e3fd00000008 ]---

This patch fixes the issue by checking for the availability of MCPM
before initializing the big.LITTLE cpuidle driver

Signed-off-by: Sudeep Holla <sudeep.holla@arm.com>
Acked-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Cc: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Cc: Daniel Lezcano <daniel.lezcano@linaro.org>
Cc: "Rafael J. Wysocki" <rjw@rjwysocki.net>
Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
2015-01-23 15:05:48 +01:00
..
governors cpuidle: ladder: Better idle duration measurement without using CPUIDLE_FLAG_TIME_INVALID 2014-12-17 02:26:28 +01:00
coupled.c arch: Mass conversion of smp_mb__*() 2014-04-18 14:20:48 +02:00
cpuidle-arm64.c Merge back earlier cpuidle material for 3.19-rc1. 2014-11-21 16:31:42 +01:00
cpuidle-at91.c Driver core patches for 3.19-rc1 2014-12-14 16:10:09 -08:00
cpuidle-big_little.c drivers: cpuidle: Don't initialize big.LITTLE driver if MCPM is unavailable 2015-01-23 15:05:48 +01:00
cpuidle-calxeda.c Driver core patches for 3.19-rc1 2014-12-14 16:10:09 -08:00
cpuidle-clps711x.c cpuidle: drop owner assignment from platform_drivers 2014-10-20 16:20:24 +02:00
cpuidle-cps.c cpuidle: Invert CPUIDLE_FLAG_TIME_VALID logic 2014-11-12 21:17:27 +01:00
cpuidle-exynos.c Driver core patches for 3.19-rc1 2014-12-14 16:10:09 -08:00
cpuidle-kirkwood.c Driver core patches for 3.19-rc1 2014-12-14 16:10:09 -08:00
cpuidle-mvebu-v7.c Driver core patches for 3.19-rc1 2014-12-14 16:10:09 -08:00
cpuidle-powernv.c powerpc updates for 3.19 batch 2 2014-12-19 12:57:45 -08:00
cpuidle-pseries.c cpuidle: Invert CPUIDLE_FLAG_TIME_VALID logic 2014-11-12 21:17:27 +01:00
cpuidle-ux500.c Driver core patches for 3.19-rc1 2014-12-14 16:10:09 -08:00
cpuidle-zynq.c Driver core patches for 3.19-rc1 2014-12-14 16:10:09 -08:00
cpuidle.c sched: Let the scheduler see CPU idle states 2014-09-24 14:46:58 +02:00
cpuidle.h cpuidle: support multiple drivers 2012-11-15 00:34:23 +01:00
driver.c cpuidle: Invert CPUIDLE_FLAG_TIME_VALID logic 2014-11-12 21:17:27 +01:00
dt_idle_states.c Merge back earlier cpuidle material for 3.19-rc1. 2014-11-21 16:31:42 +01:00
dt_idle_states.h drivers: cpuidle: implement DT based idle states infrastructure 2014-09-25 10:52:20 +02:00
governor.c cpuidle: Replace strnicmp with strncasecmp 2014-09-25 01:17:10 +02:00
Kconfig drivers: cpuidle: CPU idle ARM64 driver 2014-09-25 10:52:21 +02:00
Kconfig.arm ACPI and power management updates for 3.18-rc1 2014-10-09 16:07:43 -04:00
Kconfig.arm64 drivers: cpuidle: CPU idle ARM64 driver 2014-09-25 10:52:21 +02:00
Kconfig.mips MIPS: Kconfig: Add missing MIPS_CPS dependencies to PM and cpuidle 2014-10-23 19:58:05 +02:00
Kconfig.powerpc powerpc/powernv/cpuidle: Back-end cpuidle driver for powernv platform. 2014-01-29 17:02:24 +11:00
Makefile drivers: cpuidle: CPU idle ARM64 driver 2014-09-25 10:52:21 +02:00
sysfs.c cpuidle: fix permission for driver name sysfs node 2014-07-19 21:43:28 +02:00