forked from Minki/linux
979d5199fe
This patch collects various small updates related to root hubs, to shrink
later patches which build on them.
- For root hub suspend/resume support:
* Make the existing usb_hcd_resume_root_hub() routine respect pmcore
locking, exporting and using the dpm_runtime_resume() method.
* Add a new usb_hcd_suspend_root_hub() to pair with that routine.
(Essential to make OHCI autosuspend behave again...)
* HC_SUSPENDED by itself only refers to the root hub's downstream ports.
So let HCDs see root hub URBs unless the parent device is suspended.
- Remove an assertion we no longer need (and now, also don't want).
- Generic suspend/resume updates to work better with swsusp.
* Ignore the FREEZE vs SUSPEND distinction for hardware; trying to
use it breaks the swsusp snapshots it's supposed to help (sigh).
* On resume, mark devices as resumed right away, but then
do nothing else if the device is marked NOTATTACHED.
These changes shouldn't be very noticable by themselves.
Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
drivers/base/power/runtime.c | 1
drivers/usb/core/hcd.c | 64 ++++++++++++++++++++++++++++++++++++++-----
drivers/usb/core/hcd.h | 1
drivers/usb/core/hub.c | 45 ++++++++++++++++++++++++------
drivers/usb/core/usb.c | 20 +++++++++----
drivers/usb/core/usb.h | 1
6 files changed, 111 insertions(+), 21 deletions(-)
83 lines
1.7 KiB
C
83 lines
1.7 KiB
C
/*
|
|
* drivers/base/power/runtime.c - Handling dynamic device power management.
|
|
*
|
|
* Copyright (c) 2003 Patrick Mochel
|
|
* Copyright (c) 2003 Open Source Development Lab
|
|
*
|
|
*/
|
|
|
|
#include <linux/device.h>
|
|
#include "power.h"
|
|
|
|
|
|
static void runtime_resume(struct device * dev)
|
|
{
|
|
dev_dbg(dev, "resuming\n");
|
|
if (!dev->power.power_state.event)
|
|
return;
|
|
if (!resume_device(dev))
|
|
dev->power.power_state = PMSG_ON;
|
|
}
|
|
|
|
|
|
/**
|
|
* dpm_runtime_resume - Power one device back on.
|
|
* @dev: Device.
|
|
*
|
|
* Bring one device back to the on state by first powering it
|
|
* on, then restoring state. We only operate on devices that aren't
|
|
* already on.
|
|
* FIXME: We need to handle devices that are in an unknown state.
|
|
*/
|
|
|
|
void dpm_runtime_resume(struct device * dev)
|
|
{
|
|
down(&dpm_sem);
|
|
runtime_resume(dev);
|
|
up(&dpm_sem);
|
|
}
|
|
EXPORT_SYMBOL(dpm_runtime_resume);
|
|
|
|
|
|
/**
|
|
* dpm_runtime_suspend - Put one device in low-power state.
|
|
* @dev: Device.
|
|
* @state: State to enter.
|
|
*/
|
|
|
|
int dpm_runtime_suspend(struct device * dev, pm_message_t state)
|
|
{
|
|
int error = 0;
|
|
|
|
down(&dpm_sem);
|
|
if (dev->power.power_state.event == state.event)
|
|
goto Done;
|
|
|
|
if (dev->power.power_state.event)
|
|
runtime_resume(dev);
|
|
|
|
if (!(error = suspend_device(dev, state)))
|
|
dev->power.power_state = state;
|
|
Done:
|
|
up(&dpm_sem);
|
|
return error;
|
|
}
|
|
|
|
|
|
/**
|
|
* dpm_set_power_state - Update power_state field.
|
|
* @dev: Device.
|
|
* @state: Power state device is in.
|
|
*
|
|
* This is an update mechanism for drivers to notify the core
|
|
* what power state a device is in. Device probing code may not
|
|
* always be able to tell, but we need accurate information to
|
|
* work reliably.
|
|
*/
|
|
void dpm_set_power_state(struct device * dev, pm_message_t state)
|
|
{
|
|
down(&dpm_sem);
|
|
dev->power.power_state = state;
|
|
up(&dpm_sem);
|
|
}
|