PM branch rebased to 2.6.29

[Kevin Hilman <khilman@deeprootsystems.com>]

FYI... 

The PM branch has now been rebased to today's linux-omap HEAD which is
based on v2.6.29-rc8.  The previous PM branch has been renamed to
pm-2.6.28.  Depending on when you look, Tony's linux-omap tree may not
(yet) have the latest PM branch.  If not, you can use my PM tree[1]
directly.  Also, pm-2.6.28 will only be available on my tree.

Tested on OMAP3 Beagle and RX51 and was able to hit RET and OFF in
suspend and in PM idle with minimal kernel.  No testing yet done for
CPUidle or DVFS.  Please test on your hardware and submit results to
the list.  Thanks.

Kevin

--

Misc. conflicts/issues resolved after rebase:

- no longer safe to use getnstimeofday() in suspend path since timekeeping
  subsystem is also suspended in the suspend path.  PM debug timing has
  been converted to use sched_clock() which is 32k sync-timer based.

- Update board-rx51.c to use common OMAP3 OPPs

Known issues:

- Beagle: MMC: off-mode needs work in MMC driver, so if you hit off
  and have a rootfs on MMC, you're dead.

- Beagle: MMC regulator: unbalanced disables.  This happens on boot
  and during suspend/resume. I don't think this is related to the PM
  branch, but is probably in linux-omap HEAD also, but didn't test.

Linux version 2.6.29-rc8-omap1-arm-omap3beagle-default-05653-gd803372-dirty (khilman@vence) (gcc version 4.3.2 (Sourcery G++ Lite 2008q3-66) ) #4 PREEMPT Tue Mar 17 21:38:09 PDT 2009
[...]
i2c_omap i2c_omap.1: bus 1 rev3.12 at 2600 kHz
twl4030: PIH (irq 7) chaining IRQs 368..375
twl4030: power (irq 373) chaining IRQs 376..383
twl4030: gpio (irq 368) chaining IRQs 384..401
beagle_twl_gpio_setup:145
twl4030_mmc_init:303
twl4030_mmc_init:318
regulator: VMMC1: 1850 <--> 3150 mV normal standby
regulator: VDAC: 1800 mV normal standby
regulator: VUSB1V5: 1500 <--> 0 mV normal standby
regulator: VUSB1V8: 1800 <--> 0 mV normal standby
regulator: VUSB3V1: 3100 <--> 0 mV normal standby
regulator: VSIM: 1800 <--> 3000 mV normal standby
[...]
mmci-omap-hs mmci-omap-hs.0: Failed to get debounce clock
------------[ cut here ]------------
WARNING: at /net/home/khilman/work/kernel/omap/pm/drivers/regulator/core.c:1216 regulator_disable+0x64/0x90()
unbalanced disables for supply mmci-omap-hs.0-vmmc
Modules linked in:
[<c02a0830>] (dump_stack+0x0/0x14) from [<c0053af0>] (warn_slowpath+0x6c/0x88)
[<c0053a84>] (warn_slowpath+0x0/0x88) from [<c01b8bdc>] (regulator_disable+0x64/0x90)
 r3:c79dc2a0 r2:c03390cb
 r7:c78e8c20 r6:c78aac38 r5:c78e8c20 r4:fffffffb
[<c01b8b78>] (regulator_disable+0x0/0x90) from [<c0209400>] (mmc_regulator_set_ocr+0xb0/0xcc)
 r7:c78e8c20 r6:00000001 r5:00000000 r4:00000000
[<c0209350>] (mmc_regulator_set_ocr+0x0/0xcc) from [<c003abe8>] (twl_mmc1_set_power+0xc0/0xec)
 r7:c784f538 r6:00000000 r5:00000000 r4:c039185c
[<c003ab28>] (twl_mmc1_set_power+0x0/0xec) from [<c0210aa8>] (omap_mmc_set_ios+0x54/0x2b0)
 r7:c784f538 r6:c784f5c0 r5:c784f400 r4:c7844380
[<c0210a54>] (omap_mmc_set_ios+0x0/0x2b0) from [<c0208dc8>] (mmc_power_off+0x54/0x58)
 r7:c784f400 r6:c7910400 r5:00000000 r4:c784f400
[<c0208d74>] (mmc_power_off+0x0/0x58) from [<c0209074>] (mmc_start_host+0x14/0x24)
[<c0209060>] (mmc_start_host+0x0/0x24) from [<c020a2a0>] (mmc_add_host+0x58/0x64)
 r5:00000000 r4:c784f400
[<c020a248>] (mmc_add_host+0x0/0x64) from [<c001ec00>] (omap_mmc_probe+0x3d0/0x548)
 r5:c784f5c0 r4:00000000
[<c001e830>] (omap_mmc_probe+0x0/0x548) from [<c01dd554>] (platform_drv_probe+0x20/0x24)
[<c01dd534>] (platform_drv_probe+0x0/0x24) from [<c01dc740>] (driver_probe_device+0xd4/0x180)
[<c01dc66c>] (driver_probe_device+0x0/0x180) from [<c01dc854>] (__driver_attach+0x68/0x8c)
 r7:c789d140 r6:c038ada4 r5:c7910490 r4:c7910408
[<c01dc7ec>] (__driver_attach+0x0/0x8c) from [<c01dbf8c>] (bus_for_each_dev+0x4c/0x80)
 r7:c789d140 r6:c038ada4 r5:c01dc7ec r4:00000000
[<c01dbf40>] (bus_for_each_dev+0x0/0x80) from [<c01dc584>] (driver_attach+0x20/0x28)
 r6:c038ada4 r5:00000000 r4:00000000
[<c01dc564>] (driver_attach+0x0/0x28) from [<c01db868>] (bus_add_driver+0xa8/0x210)
[<c01db7c0>] (bus_add_driver+0x0/0x210) from [<c01dca78>] (driver_register+0x98/0x120)
 r8:00000001 r7:c001e814 r6:c038ada4 r5:00000000 r4:c0024a44
[<c01dc9e0>] (driver_register+0x0/0x120) from [<c01dd9fc>] (platform_driver_register+0x6c/0x88)
 r9:00000000 r8:00000001 r7:c001e814 r6:00000000 r5:00000000
r4:c0024a44
[<c01dd990>] (platform_driver_register+0x0/0x88) from [<c001e828>] (omap_mmc_init+0x14/0x1c)
[<c001e814>] (omap_mmc_init+0x0/0x1c) from [<c00292ec>] (do_one_initcall+0x5c/0x19c)
[<c0029290>] (do_one_initcall+0x0/0x19c) from [<c0008404>] (kernel_init+0x84/0xf8)
 r8:00000000 r7:00000000 r6:00000000 r5:00000000 r4:c0024a44
[<c0008380>] (kernel_init+0x0/0xf8) from [<c0056ea0>] (do_exit+0x0/0x764)
 r4:00000000
---[ end trace e339700732a37a4d ]---
[.../
(none):~# echo 1 > /sys/power/clocks_off_while_idle 
(none):~# echo mem > /sys/power/state
PM: Syncing filesystems ... done.
Freezing user space processes ... (elapsed 0.00 seconds) done.
Freezing remaining freezable tasks ... (elapsed 0.00 seconds) done.
Suspending console(s) (use no_console_suspend to debug)
------------[ cut here ]------------
WARNING: at /net/home/khilman/work/kernel/omap/pm/drivers/regulator/core.c:1216 regulator_disable+0x64/0x90()
unbalanced disables for supply mmci-omap-hs.0-vmmc
Modules linked in:
[<c02a0830>] (dump_stack+0x0/0x14) from [<c0053af0>] (warn_slowpath+0x6c/0x88)
[<c0053a84>] (warn_slowpath+0x0/0x88) from [<c01b8bdc>] (regulator_disable+0x64/0x90)
 r3:c79dc2a0 r2:c03390cb
 r7:c78e8c20 r6:c78aac38 r5:c78e8c20 r4:fffffffb
[<c01b8b78>] (regulator_disable+0x0/0x90) from [<c0209400>] (mmc_regulator_set_ocr+0xb0/0xcc)
 r7:c78e8c20 r6:00000001 r5:00000000 r4:00000000
[<c0209350>] (mmc_regulator_set_ocr+0x0/0xcc) from [<c003abe8>] (twl_mmc1_set_power+0xc0/0xec)
 r7:c784f538 r6:00000000 r5:00000000 r4:c039185c
[<c003ab28>] (twl_mmc1_set_power+0x0/0xec) from [<c0210aa8>] (omap_mmc_set_ios+0x54/0x2b0)
 r7:c784f538 r6:c784f5c0 r5:c784f400 r4:c7844380
[<c0210a54>] (omap_mmc_set_ios+0x0/0x2b0) from [<c0208dc8>] (mmc_power_off+0x54/0x58)
 r7:c7910490 r6:c7910400 r5:a0000013 r4:c784f400
[<c0208d74>] (mmc_power_off+0x0/0x58) from [<c02097e0>] (mmc_suspend_host+0x14c/0x154)
[<c0209694>] (mmc_suspend_host+0x0/0x154) from [<c02107e0>] (omap_mmc_suspend+0x30/0xe0)
 r5:c0388a74 r4:c784f5c0
[<c02107b0>] (omap_mmc_suspend+0x0/0xe0) from [<c01dd5d4>] (platform_drv_suspend+0x20/0x24)
 r7:c7910490 r6:c79104b8 r5:c0388a74 r4:c0388ba4
[<c01dd5b4>] (platform_drv_suspend+0x0/0x24) from [<c01dd6c4>] (platform_pm_suspend+0x50/0x5c)
[<c01dd674>] (platform_pm_suspend+0x0/0x5c) from [<c01df9ec>] (pm_op+0x38/0x7c)
[<c01df9b4>] (pm_op+0x0/0x7c) from [<c01e0150>] (device_suspend+0x350/0x480)
 r5:c7910408 r4:c0388ba4
[<c01dfe00>] (device_suspend+0x0/0x480) from [<c007d4b8>] (suspend_devices_and_enter+0x44/0x1c4)
[<c007d474>] (suspend_devices_and_enter+0x0/0x1c4) from [<c007d7a0>] (enter_state+0x134/0x1b8)
 r7:c02a5bf4 r6:00000003 r5:c031de6b r4:000072ab
[<c007d66c>] (enter_state+0x0/0x1b8) from [<c007d8c0>] (state_store+0x9c/0xc4)
 r7:c02a5bf4 r6:00000003 r5:00000003 r4:c031de6b
[<c007d824>] (state_store+0x0/0xc4) from [<c019329c>] (kobj_attr_store+0x20/0x24)
[<c019327c>] (kobj_attr_store+0x0/0x24) from [<c00f7010>] (sysfs_write_file+0x110/0x144)
[<c00f6f00>] (sysfs_write_file+0x0/0x144) from [<c00ac7b4>] (vfs_write+0xb8/0x148)
[<c00ac6fc>] (vfs_write+0x0/0x148) from [<c00ac908>] (sys_write+0x44/0x70)
 r7:00000004 r6:c78d3ae0 r5:00000000 r4:00000000
[<c00ac8c4>] (sys_write+0x0/0x70) from [<c0029e20>] (ret_fast_syscall+0x0/0x2c)
 r8:c0029fc8 r7:00000004 r6:401ab5e0 r5:000c3408 r4:00000004
---[ end trace e339700732a37a4f ]---
Successfully put all powerdomains to target state
Restarting tasks ... done.

[1] http://git.kernel.org/?p=linux/kernel/git/khilman/linux-omap-pm.git;a=summary