Santosh Shilimkar <santosh.shilimkar@xxxxxx> writes: > V2 updates: > Rebased on 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. > > Full series with cherry-picked dependencies are available on below > git branch. Can you summarize the status of the dependencies and when they will merge? IOW, aside from the static dependency hack, is Russell merging all of the others? Kevin > git://dev.omapzoom.org/pub/scm/santosh/kernel-omap4-base.git > omap4_pm_for-next_v2 > > 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 > > This series has a dependency on few patches from below series. > - GIC and SCU patches from [1] (queued up in RMK's for-next) > - Local Timer patches from [2] (queued up in RMK's for-next) > - Not clearing the static deps hack which is getting sorted out. > > 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 > off-mode debugfs control: > enable: $echo 1 > /proc/sys/debug/pm_debug/enable_off_mode > disable: $echo 0 > /proc/sys/debug/pm_debug/enable_off_mode > > Summary: > > Rajendra Nayak (1): > OMAP4: cpuidle: Basic CPUidle support > > Santosh Shilimkar (18): > 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. > > 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 | 85 ++++- > 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 | 12 +- > arch/arm/mach-omap2/pm.h | 2 + > arch/arm/mach-omap2/pm44xx.c | 119 ++++++- > arch/arm/mach-omap2/sleep44xx.S | 400 ++++++++++++++++++ > arch/arm/plat-omap/include/plat/omap44xx.h | 1 + > 15 files changed, 1958 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 > > Regrads, > Santosh > [1] http://www.mail-archive.com/linux-omap@xxxxxxxxxxxxxxx/msg42939.html > [2] http://www.spinics.net/lists/linux-omap/msg45710.html -- To unsubscribe from this list: send the line "unsubscribe linux-omap" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
