snowball/legacy-kernel.git/Documentation, branch igloo-dev

PM / Runtime: Add new helper function: pm_runtime_status_suspended()

2011-10-27T14:35:24+00:00

This boolean function simply returns whether or not the runtime status of the device is 'suspended'. Unlike pm_runtime_suspended(), this function returns the runtime status whether or not runtime PM for the device has been disabled or not. Also add entry to Documentation/power/runtime.txt Signed-off-by: Kevin Hilman Signed-off-by: Rafael J. Wysocki Change-Id: I2e31841f087b5d44a0f4d6e2f8bba2d08cfc7b64 Reviewed-on: http://gerrit.lud.stericsson.com/gerrit/35338 Reviewed-by: QABUILD Reviewed-by: Linus WALLEIJ Tested-by: Ulf HANSSON

PM: Limit race conditions between runtime PM and system sleep (v2)

2011-10-27T14:35:15+00:00

One of the roles of the PM core is to prevent different PM callbacks executed for the same device object from racing with each other. Unfortunately, after commit e8665002477f0278f84f898145b1f141ba26ee26 (PM: Allow pm_runtime_suspend() to succeed during system suspend) runtime PM callbacks may be executed concurrently with system suspend/resume callbacks for the same device. The main reason for commit e8665002477f0278f84f898145b1f141ba26ee26 was that some subsystems and device drivers wanted to use runtime PM helpers, pm_runtime_suspend() and pm_runtime_put_sync() in particular, for carrying out the suspend of devices in their .suspend() callbacks. However, as it's been determined recently, there are multiple reasons not to do so, inlcuding: * The caller really doesn't control the runtime PM usage counters, because user space can access them through sysfs and effectively block runtime PM. That means using pm_runtime_suspend() or pm_runtime_get_sync() to suspend devices during system suspend may or may not work. * If a driver calls pm_runtime_suspend() from its .suspend() callback, it causes the subsystem's .runtime_suspend() callback to be executed, which leads to the call sequence: subsys->suspend(dev) driver->suspend(dev) pm_runtime_suspend(dev) subsys->runtime_suspend(dev) recursive from the subsystem's point of view. For some subsystems that may actually work (e.g. the platform bus type), but for some it will fail in a rather spectacular fashion (e.g. PCI). In each case it means a layering violation. * Both the subsystem and the driver can provide .suspend_noirq() callbacks for system suspend that can do whatever the .runtime_suspend() callbacks do just fine, so it really isn't necessary to call pm_runtime_suspend() during system suspend. * The runtime PM's handling of wakeup devices is usually different from the system suspend's one, so .runtime_suspend() may simply be inappropriate for system suspend. * System suspend is supposed to work even if CONFIG_PM_RUNTIME is unset. * The runtime PM workqueue is frozen before system suspend, so if whatever the driver is going to do during system suspend depends on it, that simply won't work. Still, there is a good reason to allow pm_runtime_resume() to succeed during system suspend and resume (for instance, some subsystems and device drivers may legitimately use it to ensure that their devices are in full-power states before suspending them). Moreover, there is no reason to prevent runtime PM callbacks from being executed in parallel with the system suspend/resume .prepare() and .complete() callbacks and the code removed by commit e8665002477f0278f84f898145b1f141ba26ee26 went too far in this respect. On the other hand, runtime PM callbacks, including .runtime_resume(), must not be executed during system suspend's "late" stage of suspending devices and during system resume's "early" device resume stage. Taking all of the above into consideration, make the PM core acquire a runtime PM reference to every device and resume it if there's a runtime PM resume request pending right before executing the subsystem-level .suspend() callback for it. Make the PM core drop references to all devices right after executing the subsystem-level .resume() callbacks for them. Additionally, make the PM core disable the runtime PM framework for all devices during system suspend, after executing the subsystem-level .suspend() callbacks for them, and enable the runtime PM framework for all devices during system resume, right before executing the subsystem-level .resume() callbacks for them. Conflicts: drivers/base/power/main.c Change-Id: I184431a2e6663222685098d869272b5e84b93c11 Signed-off-by: Rafael J. Wysocki Acked-by: Kevin Hilman Signed-off-by: Ulf Hansson Reviewed-on: http://gerrit.lud.stericsson.com/gerrit/35337 Reviewed-by: QABUILD Reviewed-by: Linus WALLEIJ

PM / Runtime: Update documentation of interactions with system sleep

2011-10-27T14:35:05+00:00

The documents describing the interactions between runtime PM and system sleep generally refer to the model in which the system sleep state is entered through a global firmware or hardware operation. As a result, some recommendations given in there are not entirely suitable for systems in which this is not the case. Update the documentation to take the existence of those systems into account. Signed-off-by: Rafael J. Wysocki Reviewed-by: Kevin Hilman Change-Id: I926b72b01331e563d2e4a1e3b48c9e4c2ce29a05 Reviewed-on: http://gerrit.lud.stericsson.com/gerrit/35336 Reviewed-by: QABUILD Reviewed-by: Linus WALLEIJ Tested-by: Ulf HANSSON

PM: Introduce generic "noirq" callback routines for subsystems (v2)

2011-10-27T14:34:55+00:00

Introduce generic "noirq" power management callback routines for subsystems in addition to the "regular" generic PM callback routines. The new routines will be used, among other things, for implementing system-wide PM transitions support for generic PM domains. Signed-off-by: Rafael J. Wysocki Change-Id: I345a1c6d221b402f349837581681bc7b5c464ea9 Reviewed-on: http://gerrit.lud.stericsson.com/gerrit/35335 Reviewed-by: QABUILD Reviewed-by: Linus WALLEIJ Tested-by: Ulf HANSSON

rtc: ab8500: Add calibration attribute to AB8500 RealTimeClock

2011-10-05T10:42:22+00:00

The rtc_calibration attribute allows user-space to get and set the AB8500's RtcCalibration register. The AB8500 will then use the value in this register to compensate for RTC drift every 60 seconds. ST Ericsson ID: 362204 Change-Id: I32a4bda5d6cc0812dcb53d721088e8b844c25b46 Signed-off-by: Mark Godfrey Reviewed-on: http://gerrit.lud.stericsson.com/gerrit/32922 Reviewed-by: Linus WALLEIJ

Build correction after moved header file.

2011-10-04T12:18:11+00:00

ST-Ericsson ID: 364916 ST-Ericsson FOSS-OUT ID: Trivial ST-Ericsson Linux next: - Change-Id: I86d796e347ce7e8c2f3a9ddf256863ba74449ee8 Signed-off-by: pender01 Reviewed-on: http://gerrit.lud.stericsson.com/gerrit/32841 Reviewed-by: Yvan FILLION

mfd/cg2900: Support HCI Raw Channel.

2011-09-30T11:47:37+00:00

Add support for HCI Raw channel so that CG2900 can be accessed directly from user space. ST-Ericsson Linux next: Not tested, ER351170 ST-Ericsson ID: 351170 ST-Ericsson FOSS-OUT ID: Trivial Change-Id: If8a2455be32f0eb99f7c0bc7a5cf0e09270fa6af Signed-off-by: Hemant Gupta Reviewed-on: http://gerrit.lud.stericsson.com/gerrit/32206 Reviewed-by: Henrik POSSUNG Reviewed-by: Par-Gunnar HJALMDAHL

cg2900: Add KernelDoc

2011-09-28T05:47:35+00:00

This patch adds KernelDoc for the CG2900 driver. ST-Ericsson ID: 364042 ST-Ericcson FOSS-OUT-ID: Trivial ST-Ericsson Linux next: 364042 Change-Id: Idccbf196bcf4a9c5f280e3745ce3e72c499dee80 Signed-off-by: Par-Gunnar Hjalmdahl Reviewed-on: http://gerrit.lud.stericsson.com/gerrit/32035 Reviewed-by: Hemant GUPTA

ux500:USB:Fix for Build issue of HTML Docs

2011-09-23T09:28:07+00:00

"pubfunctions" is required in the .tmpl file as the compiler uses it. Adding "pubfunctions" in ux500_usb.tmpl file. ST-Ericsson ID: NA ST-Ericsson Linux next: NA ST-Ericsson FOSS-OUT ID: NA Signed-off-by: Sakethram Bommisetti Change-Id: Ic927f2001e9d0fff070a7d7b9b9871c011905aef Reviewed-on: http://gerrit.lud.stericsson.com/gerrit/31845 Reviewed-by: Praveena NADAHALLY Reviewed-by: Jonas ABERG

CG2900 FM Radio: Handling Mono-Stereo Interrupt.

2011-09-19T14:07:32+00:00

The linux FM driver for CG2900 now supports mono-stereo transition interrupt from the CG2900. It indicates stereo to mono transition or vice versa. Support for RDS Interrupt, Scan Completion Interrupt, CG2900 Reset Interrupt, etc is also added in this patch. ST-Ericsson ID: 324264 ST-Ericsson Linux next: NA ST-Ericsson FOSS-OUT ID: Trivial Change-Id: I280a2a00a6f58e105d11f3a9f14ea662719c485e Signed-off-by: Hemant Gupta Reviewed-on: http://gerrit.lud.stericsson.com/gerrit/30511 Reviewed-by: Johan PALMAEUS Reviewed-by: Virupax SADASHIVPETIMATH Tested-by: Virupax SADASHIVPETIMATH