[PATCH v2 0/4] OMAP: DMA: mstandby mode and runtime pm support

["G, Manjunath Kondaiah" <manjugk@ti.com>]

Patch series to support mstandby mode handling and enabling runtime PM
support for DMA driver.

Changes from v1:
 - fixed runtime_status issue if channel linking feature is used.
 - fixed context restore issue during off mode.
 - removed sysconfig register access during DMA context/restore

The review comments and alignment can be found at:
http://thread.gmane.org/gmane.linux.ports.arm.omap/53150

Baseline:
git://git.kernel.org/pub/scm/linux/kernel/git/tmlind/linux-omap-2.6.git
Branch: omap-for-linus
commit 94a06b74e724caabcf0464c81527cfbcae0c8aff
Merge: 0dde52a 9062511
Author: Tony Lindgren <tony@atomide.com>

Note: For OMAP2420 and OMAP2430, the patch series is tested on top of
v2.6.38-rc4 since boot fails with latest mainline for the above OMAP's.

Build:
 - omap1_defconfig
 - omap2plus_defconfig

Boot test:
 - OMAP1710 H3
 - OMAP2420 H4
 - OMAP2430 SDP
 - OMAP3430 Zoom2
 - OMAP3630 Zoom3
 - OMAP4430 Blaze

DMA tests:
The following dma test code is used for testing OMAP2+ boards:
git://gitorious.org/omap-test/dmatest.git

Apart from that, offmode testing is done for OMAP3430-Zoom2 using the procedure:
echo 1 > /debug/pm_debug/sleep_while_idle
echo 1 > /debug/pm_debug/enable_off_mode
echo 5 > /sys/devices/platform/omap/omap_uart.0/sleep_timeout
echo 5 > /sys/devices/platform/omap/omap_uart.1/sleep_timeout
echo 5 > /sys/devices/platform/omap/omap_uart.2/sleep_timeout

With the above steps, core off mode count gets increasing if the the board
is idle for more than 5 seconds.

Also, DMA transfers are done with forever option using:
insmod ./dmatest.ko linking=1 forever=1 forever_period=1024 debug=1

The /sys/devices/platform/omap/omap_dma_system.0/power/runtime_status
was verified and after completion of the tests, runtime_status will be 
always suspended.

(Special thanks to Kevin Hilman for identifying runtime_status count issue 
with DMA linking option).

G, Manjunath Kondaiah (4):
  OMAP2+: PM: omap device: API's for handling mstandby mode
  OMAP2+: DMA: prevent races while setting M idle mode to nostandby
  OMAP: PM: DMA: Enable runtime pm
  OMAP: DMA: Fix: context restore during off mode

 arch/arm/mach-omap1/dma.c                     |    1 +
 arch/arm/mach-omap2/dma.c                     |   16 ++
 arch/arm/mach-omap2/omap_hwmod.c              |   42 ++++++
 arch/arm/plat-omap/dma.c                      |  194 +++++++++++++++++++++----
 arch/arm/plat-omap/include/plat/dma.h         |    1 +
 arch/arm/plat-omap/include/plat/omap_device.h |    2 +
 arch/arm/plat-omap/include/plat/omap_hwmod.h  |    4 +-
 arch/arm/plat-omap/omap_device.c              |   64 ++++++++
 8 files changed, 293 insertions(+), 31 deletions(-)