[PATCH v2 00/18] ARM: OMAP5: PM: Add MPUSS suspend and CPUidle support

[Sourav Poddar]

Hi Santosh,
On Monday 25 March 2013 03:34 PM, Santosh Shilimkar wrote:
> Kevin,
>
> Here is the refreshed version(v2) of the OMAP5 PM suspport which was posted
> earlier (March 1st 2013). Patch-set incorporates comments from Nishant
> Menon (Thanks for review NM) and his acked-by tags. I would like to get this
> queued for 3.10 merge window if you are ok with the series.
>
> Series is built on top of my pull requests [1] [2] [3] sent to Tony and your
> 'for_3.10/pm/cleanup' branch. For testing, I have created a branch [4]
> which put together all the needed dependencies, fixes which should make it
> to 3.10 merge window.
>
> Series adds OMAP5 MPUSS power management support for system wide suspend
> and CPUidle. Its heavy re-use from OMAP4 and hence only ~400 odd lines are
> needed to add OMAP5 PM support on top of existing OMAP4 PM support.
>
> OMAP5 adds a mercury retention feature which is an enhancement of
> existing retention feature to reduce the leakage. No change in
> programming model except one time enabling of mercury retention
> during init.
>
> One more notable change in OMAP5 vs OMAP4 devices, CPUx power domains
> support retention state which lets you hit MPUSS and Core retention with
> very low latency C-states.
>
> Tested on OMAP4430 SDP, OMAP4460 Panda, OMAP5430 SDP and OMAP5432 Panda
> devices with suspend and CPUIdle. Rootfs is mounted over ramdisk since
> the mmc and nfs based fs needs DMA engine patches. For suspend wakeup,
> I used Sourav's couple of serial wakeup wip patches from the lists.
>
> The following changes since commit 9981cde24de52e5bb9a7cd918d1e54de241f85c9:
>
>    Merge branch 'for_3.10/omap5_data_files' of git://git.kernel.org/pub/scm/linux/kernel/git/ssantosh/linux into for_3.10/omap5_pm (2013-03-25 12:29:34 +0530)
>
> are available in the git repository at:
>
>
>    git://git.kernel.org/pub/scm/linux/kernel/git/ssantosh/linux.git for_3.10/omap5_pm
>
> for you to fetch changes up to 75bd846d3103da858a208fe07127151903d1f608:
>
>    ARM: OMAP5: PM: handle device instance for warm reset (2013-03-25 12:37:44 +0530)
>
> ----------------------------------------------------------------
> Nishanth Menon (1):
>    ARM: OMAP5: PM: handle device instance for warm reset
>
> Santosh Shilimkar (17):
>    ARM: OMAP4+: PM: Consolidate MPU subsystem PM code for re-use
>    ARM: OMAP5: PM: Update CPU context register offset
>    ARM: OMAP4+: PM: Consolidate and use OMAP4 PM code for OMAP5
>    ARM: OMAP5: PM: Set MPUSS-EMIF clock-domain static dependency
>    ARM: OMAP5: PM: Enables ES2 PM mode by default
>    ARM: OMAP5: PM: Enable Mercury retention mode on CPUx powerdomains
>    ARM: OMAP5: Add init_late() hook to enable pm initialization
>    ARM: OMAP5: PM: Add CPU power off in hotplug path
>    ARM: OMAP4+: PM: Restore CPU power state to ON with clockdomain force
>      wakeup method
>    ARM: OMAP5: PM: Add MPU Open Switch Retention support
>    ARM: OMAP5: PM: Add L2 memory power down support
>    ARM: OMAP4: CPUidle: Avoid double idle driver registration
>    ARM: OMAP: CPUidle: Unregister drivere on device registration failure
>    ARM: OMAP4: CPUidle: Make C-state description field more precise
>    ARM: OMAP4+: CPUidle: Consolidate idle driver for OMAP5 support
>    ARM: OMAP4+: CPUidle: Deprecate use of
>      omap4_mpuss_read_prev_context_state()
>    ARM: OMAP4+: CPUidle: Add OMAP5 idle driver support
>
>   arch/arm/mach-omap2/Kconfig                        |    1 +
>   arch/arm/mach-omap2/Makefile                       |   12 +-
>   arch/arm/mach-omap2/board-generic.c                |    1 +
>   arch/arm/mach-omap2/common.h                       |    8 +-
>   arch/arm/mach-omap2/cpuidle34xx.c                  |    6 +-
>   .../{cpuidle44xx.c =>  cpuidle_omap4plus.c}         |  151 ++++++++++++++++---
>   arch/arm/mach-omap2/io.c                           |    8 +
>   arch/arm/mach-omap2/omap-mpuss-lowpower.c          |  155 +++++++++++++++-----
>   arch/arm/mach-omap2/omap-secure.h                  |    9 ++
>   arch/arm/mach-omap2/omap-smp.c                     |   12 +-
>   arch/arm/mach-omap2/omap-wakeupgen.c               |   30 +++-
>   arch/arm/mach-omap2/omap-wakeupgen.h               |    1 +
>   arch/arm/mach-omap2/omap4-sar-layout.h             |    2 +
>   arch/arm/mach-omap2/{pm44xx.c =>  pm_omap4plus.c}   |   90 ++++++++++--
>   arch/arm/mach-omap2/prminst44xx.c                  |   10 +-
>   .../mach-omap2/{sleep44xx.S =>  sleep_omap4plus.S}  |  106 +++++++++++++
>   16 files changed, 512 insertions(+), 90 deletions(-)
>   rename arch/arm/mach-omap2/{cpuidle44xx.c =>  cpuidle_omap4plus.c} (58%)
>   rename arch/arm/mach-omap2/{pm44xx.c =>  pm_omap4plus.c} (74%)
>   rename arch/arm/mach-omap2/{sleep44xx.S =>  sleep_omap4plus.S} (77%)
>
Build tested [1] for omap2plus_defconfig.

For [2], where omap5_pm_branch[1] is merged, testing details are as follows:
    * Boot tested on omap4430 sdp, omap5 evm.

    * Wakeup from UART after suspend using dt was tested on omap4430sdp and
       omap5430 evm.
       Note: For  the above UART testing, we need to append 
"no_console_suspend" in our
                bootargs.

       Tested-by: Sourav Poddar <sourav.poddar at ti.com>

Thanks,
Sourav

[1] git://git.kernel.org/pub/scm/linux/kernel/git/ssantosh/linux 
for_3.10/omap5_pm
[2] git://git.kernel.org/pub/scm/linux/kernel/git/ssantosh/linux.git 
testing/3.10/omap5_int