. Implement the devices wake-up latency constraints using the global
device PM QoS notification handler which applies the constraints to the
underlying layer,
. Implement the low level code which controls the power domains next
functional power states, through the hwmod and pwrdm layers,
. Include a fix for the cpuidle code to always return a valid C-state,
. Add cpuidle and power domains wake-up latency figures for OMAP3, cf.
comments in the code and [1] for the details on where the numbers
are magically coming from,
. Implement the relation between the cpuidle and per-device PM QoS frameworks
in the OMAP3 specific idle callbacks.
The chosen C-state shall satisfy the following conditions:
. it satisfies the enable_off_mode flag,
. the next state for MPU and CORE power domains is not lower than the
state programmed by the per-device PM QoS.
. convert I2C driver to PM QoS for latency constraints,
. remove the latency related functions from the API (omap_pm_set_*) and
update the kernel Documentation accordingly.
ToDo:
1. Re-visit the OMAP power domains states initialization procedure. Currently
the power states that have been changed from the constraints API which were
applied before the initialization of the power domains are lost
2. Further clean-up the OMAP PM layer, use the generic frameworks instead (OPP,
PM QoS for throughput constraints ...)
Note: the following commits are required and so are included in this series,
although they are planned for inclusion into mainline via the linux-omap tree:
. ARM: OMAP2+: hwmod: manage the wake-up latency constraints
. ARM: OMAP3: PM: cpuidle: default to C1 in next_valid_state
Based on mainline kernel 3.5.0-rc2 with the functional power states changes
applied.
Tested cpuidle and suspend on OMAP3 Beagleboard (ES2.x) with constraints
on MPU, CORE, PER in RETention and OFF modes.
[1] http://www.omappedia.org/wiki/Power_Management_Device_Latencies_Measurement
History:
v8:
. reworked the code after internal review and testing with OMAP3&4 device
OFF
v7:
. rebased on top of the functional power state changes
v6:
. minor change in the commits description after Kevin's review
. added Kevin's Reviewed-by
v5:
. rebased on latest linux-omap
. rework after Kevin's comments on the MLs
v4:
. split up the patches which remove the omap_pm_ code from the patch set.
Those patches are to be submitted later, on top of this patch set.
. latency numbers: provide the measurements setup and conditions in the code
comments, added the link to the details on wiki [1].
. improved kerneldoc
. split big functions into smaller ones, in order to improve the readability
v3: reworked the error return path and improved the kerneldoc
v2: reworked the OMAP specific cpuidle code to demote the initial C-state to
a valid C-state which fulfills the per-device constraints
v1: initial version
Jean Pihet (10):
ARM: OMAP2+: PM QoS: control the power domains next state from the
constraints
ARM: OMAP2+: hwmod: manage the wake-up latency constraints
ARM: OMAP2+: PM QoS: manage the per-device latency constraints in
hwmod
ARM: OMAP: omap_device: register to the per-device PM QoS framework
ARM: OMAP3: cpuidle: next C-state decision depends on the PM QoS MPU
and CORE constraints
ARM: OMAP3: PM: cpuidle: default to C1 in next_valid_state
ARM: OMAP3: update cpuidle latency and threshold figures
ARM: OMAP3: powerdomain data: add wake-up latency figures
ARM: OMAP: convert I2C driver to PM QoS for latency constraints
ARM: OMAP: PM: remove the latency related functions from the API
Documentation/arm/OMAP/omap_pm | 68 +++------
arch/arm/mach-omap2/cpuidle34xx.c | 124 ++++++++++-----
arch/arm/mach-omap2/omap_hwmod.c | 44 +++++-
arch/arm/mach-omap2/powerdomain.c | 215 ++++++++++++++++++++++++++
arch/arm/mach-omap2/powerdomain.h | 18 ++
arch/arm/mach-omap2/powerdomains3xxx_data.c | 83 ++++++++++
arch/arm/plat-omap/i2c.c | 21 ---
arch/arm/plat-omap/include/plat/omap-pm.h | 99 ------------
arch/arm/plat-omap/include/plat/omap_hwmod.h | 5 +
arch/arm/plat-omap/omap-pm-noop.c | 88 -----------
arch/arm/plat-omap/omap_device.c | 81 ++++++++++-
drivers/i2c/busses/i2c-omap.c | 28 ++--
include/linux/i2c-omap.h | 1 -
13 files changed, 563 insertions(+), 312 deletions(-)
--
1.7.7.6
--
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
