[RFC PATCH v5 0/4] ARM: OMAP2+: AM33XX: Add suspend-resume support

[Tony Lindgren]

* Dave Gerlach <d-gerlach at ti.com> [141126 13:54]:
> Hi,
> This series is v5 of the series to add suspend/resume support for Texas
> Instruments AM335x SoC. It has gone through a rather major overhaul
> since the last version and because of that has been split into multiple
> different sets of patches, on which this series depends. Previous discussion
> that influenced there changes can be found here [1]. This series depends on
> generic sram exec mapping patch here [2], emif series here [3],
> and wkup_m3_ipc series here [4]. I have pushed a branch containing the patches
> from ALL required series here [5] for testing or a view of the high level
> flow of the entire series.
> 
> The largest change with this revision is the introduction of a
> wkup_m3_ipc driver which handles all communication with the Cortex M3
> present on am335x for handling low power tasks. Previously this was
> handled in the wkup_m3_rproc driver (also sent in an earlier series)
> but that driver is now only responsible for booting the wkup_m3. The
> wkup_m3_ipc driver exposes an API with all required PM functionality
> needed by the PM code introduced by this series, so the PM code has
> shrunk considerably.
> 
> Another major change is that the EMIF code previously present in the
> sleep33xx asm code and pm33xx code for save and restore of EMIF context
> and entry into low power mode has all been moved in to a separate EMIF
> driver, further reducing the size of the PM code. Because of this, moving
> the emif header defines into include/linux/ti_emif.h is no longer necessary.
> 
> Other changes include clean up of the timer suspend/resume handlers, now
> look up hwmod in init and use that handle along with renaming to
> *_idle/*_unidle to avoid confusion with true suspend handlers. 
> 
> Suspend support requires:
> CONFIG_TI_EMIF_SRAM
> CONFIG_WKUP_M3_RPROC
> CONFIG_WKUP_M3_IPC
> 
> And also requires AM335x USB support to be enabled to work for multiple
> cycles. If you want to load firmware from rootfs in /lib/firmware you now
> must also select CONFIG_FW_LOADER_USER_HELPER_FALLBACK.
> 
> This code works with version 0x189 of the CM3 firmware found here [6] on
> the next branch, /bin/am335x-pm-firmware.elf.

Dave, does this series have dependencies to the other patches? Can some
parts of this already be applied without breaking anything?

Regards,

Tony
 
> [1] http://www.spinics.net/lists/linux-omap/msg109331.html
> [2] http://www.spinics.net/linux/lists/kernel/msg1876629.html
> [3] http://www.spinics.net/linux/lists/kernel/msg1876646.html
> [4] http://www.spinics.net/linux/lists/kernel/msg1876642.html
> [5] https://github.com/dgerlach/linux-pm/tree/rfc-pm-am335x-v3.18-rc6
> [6] https://git.ti.com/ti-cm3-pm-firmware/amx3-cm3/commits/next
> 
> Dave Gerlach (3):
>   ARM: OMAP2+: AM33XX: Add assembly code for PM operations
>   ARM: OMAP2+: AM33XX: Basic suspend resume support
>   ARM: OMAP2+: AM33XX: Hookup AM33XX PM code into OMAP builds
> 
> Vaibhav Bedia (1):
>   ARM: OMAP2+: timer: Add suspend-resume callbacks for clkevent device
> 
>  arch/arm/boot/dts/am33xx.dtsi   |   2 +
>  arch/arm/mach-omap2/Makefile    |   2 +
>  arch/arm/mach-omap2/common.h    |   9 ++
>  arch/arm/mach-omap2/io.c        |   1 +
>  arch/arm/mach-omap2/pm.h        |   6 +
>  arch/arm/mach-omap2/pm33xx.c    | 250 ++++++++++++++++++++++++++++++++++++++++
>  arch/arm/mach-omap2/sleep33xx.S | 216 ++++++++++++++++++++++++++++++++++
>  arch/arm/mach-omap2/timer.c     |  28 +++++
>  8 files changed, 514 insertions(+)
>  create mode 100644 arch/arm/mach-omap2/pm33xx.c
>  create mode 100644 arch/arm/mach-omap2/sleep33xx.S
> 
> -- 
> 2.1.0
>