V3 updates:
It's same as V2 with couple of minor updates and its rebased on Kevin's
latest pm-core branch.
- Dropped 'enable_off_mode' flag altogether for OMAP4 as discussed on the list.
- Removed non-supported pm debug entries
The following changes since commit 61cbb3172176b84c106bf0f4c32317c472932ab5:
Kevin Hilman (1):
Merge branch 'for_2.6.40/pm-misc' into pm-reset
are available in the git repository at:
git://dev.omapzoom.org/pub/scm/santosh/kernel-omap4-base.git omap4_pm_pmcore_v3
Dependent patches and integrated barnch against pm-core branch
are also available at below.
git://dev.omapzoom.org/pub/scm/santosh/kernel-omap4-base.git omap4_pm_pmcore_dep
git://dev.omapzoom.org/pub/scm/santosh/kernel-omap4-base.git omap4_pm_pmcore_int
V2 updates:
Rebased on Kevin's latest pm-core branch and fixes below comments
from Kevin Hilman <khilman@xxxxxx>.
- All acronym fixes
- Use WARN_ON() instead of BUG_ON() with graceful exit.
- Export omap4_get_base*() rather than global address pointers
- CPUidle prepare() hook + hotplug notifier to manage C-state dynamically.
- Dropped debugfs way of changing C-state valid flags in favor of above.
This series adds OMAP4 suspend and cpuidle support till MPU subsystem
(MPUSS) off-mode. The suspend on SMP machines uses cpu-hotplug
infrastructure to take down the non-boot CPUs. We put secondary
CPU(CPU1 in OMAP4) to OFF state via cpu-hotplug.
In cpuidle too, low power states are attempted only when the
CPU1 is put to OFF state via cpu-hotplug because of hardware
constraints.
Timer wakeup from suspend, debug pm counters and enable_off_mode
provisions are supported as well.
Special thanks to Kevin Hilman <khilman@xxxxxx> for doing detail
off-the list reviews.
The patches are generated against mainline 2.6.38-rc5 and tested with
OMAP4430 SDP and OMAP4 PANDA board. Any OMAP4 board with ES2.X silicon,
below features should work with this series. On ES1.0, these PM
features are not supported.
1. CPU hotplug (CPU is put into off-mode)
2. Suspend (Both CPUs put to off-mode and MPUSS to OFF/RET)
3. CPUILDE with below C-states.
C1 - CPU0 ON + CPU1 ON/OFF + MPU ON + CORE ON
C2 - CPU0 ON + CPU1 OFF + MPU ON + CORE ON
C3 - CPU0 OFF + CPU1 OFF + MPU CSWR + CORE ON
C4 - CPU0 OFF + CPU1 OFF + MPU OFF + CORE ON
In OMAP4 mpuss consist of dual Cortex-A9 with per-cpu local timers
GIC(Generic Interrupt Controller), SCU(Snoop Control Unit) and PL310
L2 cache controller and CPU0/CPU1 LPRM modules.
CPU0, CPU1 and MPUSS have there own power domain and hence multiple
low power state combinations are possible. The CPU10 and CPU1
Close switch Retention(CSWR) isn't supported by hardware.
Based on various studies, measurements, hardware constraints
and recommendations from hardware team, only below low power
modes are supported on OMAP4.
----------------------------------------
CPU0 CPU1 MPUSS
----------------------------------------
ON ON ON
OFF OFF CSWR
OFF OFF OSWR
OFF OFF OFF
-----------------------------------------
Note: CPU0 is the master core and it is the last CPU to go down
and first to wake-up when MPUSS low power states are attempted
OSWR(Open Switch Retention) is not added as part of this series
because it needs some power domain level support which isn't ready
yet.
http://www.mail-archive.com/linux-omap@xxxxxxxxxxxxxxx/msg38667.html
Powerdomain INACTIVE support is also dropped because of its
inconsistency between OMAP4 and OMAP3.
More information on this thread -
http://www.spinics.net/lists/linux-omap/msg45370.html
The cpu-hotplug and suspend works with omap2plus_defconfig. Not to damage
your file system with current omap2plus_defconfig, disable ARCH_OMAP2 so
that V6 and V7 support is not built together with SMP.
To tryout cpuidle, CONFIG_CPU_IDLE needs to be enabled in the build.
CPU-HOTPLUG commands :
offline : $echo 0 > /sys/devices/system/cpu/cpu1/online
online : $echo 1 > /sys/devices/system/cpu/cpu1/online
Suspend :$echo mem > /sys/power/state
cpuilde : To trigger cpuidle deeper C-states on OMAP4, CPU1 needs
to be offlied
$echo 0 > /sys/devices/system/cpu/cpu1/online
To see PM debug counters,
$mount -t debugfs debugfs /proc/sys/debug/
$cat /proc/sys/debug/pm_debug/count
The following changes since commit 61cbb3172176b84c106bf0f4c32317c472932ab5:
Kevin Hilman (1):
Merge branch 'for_2.6.40/pm-misc' into pm-reset
are available in the git repository at:
git://dev.omapzoom.org/pub/scm/santosh/kernel-omap4-base.git omap4_pm_pmcore_v3
Rajendra Nayak (1):
OMAP4: cpuidle: Basic CPUidle support
Santosh Shilimkar (20):
OMAP4: PM: Add omap WakeupGen module support
OMAP4: Use WARN_ON() instead of BUG_ON() with graceful exit
OMAP4: PM: Export omap4_get_base*() rather than global address pointers
OMAP4: PM: Add SAR RAM support
OMAP4: PM: Add CPUX OFF mode support
OMAP4: PM: Initialise all the clockdomains to supported states
OMAP4: PM: Program CPU1 to hit OFF when off-lined
OMAP4: PM: CPU1 wakeup workaround from Low power modes
OMAP4: PM: Add GIC distributor and interface enable/disable accessory API
OMAP4: PM: Add GIC save/restore support
OMAP4: PM: Add WakeupGen save/restore support
OMAP4: PM: Add L2 cache lowpower support
OMAP4: suspend: Add MPUSS RET and OFF support
OMAP4: pm-debug: Add wakeup timer and debug counters
OMAP4: cpuidle: Add MPUSS RET OFF states
OMAP4: cpuidle: Switch to gptimer from twd in deeper C-states.
OMAP4: cpuidle: Add CPU hotplug notifier and prepare() hook.
OMAP4: Remove un-used do_wfi() macro.
OMAP4: PM: Set static dependency between MPUSS-EMIF and MPUSS-L3_1
OMAP4: PM: Avoid omap4_pm_init() on OMAP4430 ES1.0
arch/arm/mach-omap2/Makefile | 8 +-
arch/arm/mach-omap2/cpuidle44xx.c | 352 ++++++++++++++++
arch/arm/mach-omap2/include/mach/omap-wakeupgen.h | 41 ++
arch/arm/mach-omap2/include/mach/omap4-common.h | 73 +++-
arch/arm/mach-omap2/omap-hotplug.c | 30 ++-
arch/arm/mach-omap2/omap-smp.c | 32 ++-
arch/arm/mach-omap2/omap-wakeupgen.c | 319 +++++++++++++++
arch/arm/mach-omap2/omap4-common.c | 86 ++++-
arch/arm/mach-omap2/omap4-mpuss-lowpower.c | 451 +++++++++++++++++++++
arch/arm/mach-omap2/omap4-sar-layout.h | 66 +++
arch/arm/mach-omap2/pm-debug.c | 11 +-
arch/arm/mach-omap2/pm.h | 1 +
arch/arm/mach-omap2/pm44xx.c | 138 ++++++-
arch/arm/mach-omap2/sleep44xx.S | 404 ++++++++++++++++++
arch/arm/plat-omap/include/plat/omap44xx.h | 1 +
15 files changed, 1980 insertions(+), 33 deletions(-)
create mode 100644 arch/arm/mach-omap2/cpuidle44xx.c
create mode 100644 arch/arm/mach-omap2/include/mach/omap-wakeupgen.h
create mode 100644 arch/arm/mach-omap2/omap-wakeupgen.c
create mode 100644 arch/arm/mach-omap2/omap4-mpuss-lowpower.c
create mode 100644 arch/arm/mach-omap2/omap4-sar-layout.h
create mode 100644 arch/arm/mach-omap2/sleep44xx.S
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