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Updates for omap_device layer for v3.7.

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Allows omap_device layer to keep track of driver bound status in order
 to make more intelligent decisions about idling unused devices.
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Merge tag 'for_3.7-omap_device' of git://git.kernel.org/pub/scm/linux/kernel/git/khilman/linux-omap-pm into devel-omap-device

Updates for omap_device layer for v3.7.

Allows omap_device layer to keep track of driver bound status in order
to make more intelligent decisions about idling unused devices.
This commit is contained in:
Tony Lindgren 2012-09-12 21:17:56 -07:00
commit 47d85ec2a2
2 changed files with 53 additions and 5 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
arch/arm/plat-omap/include/plat/omap_device.h
View File

@ -60,6 +60,7 @@ extern struct dev_pm_domain omap_device_pm_domain;
* @_dev_wakeup_lat_limit: dev wakeup latency limit in nsec - set by OMAP PM
* @_state: one of OMAP_DEVICE_STATE_* (see above)
* @flags: device flags
* @_driver_status: one of BUS_NOTIFY_*_DRIVER from <linux/device.h>
*
* Integrates omap_hwmod data into Linux platform_device.
*
@ -73,6 +74,7 @@ struct omap_device {
struct omap_device_pm_latency *pm_lats;
u32 dev_wakeup_lat;
u32 _dev_wakeup_lat_limit;
unsigned long _driver_status;
u8 pm_lats_cnt;
s8 pm_lat_level;
u8 hwmods_cnt;

56
arch/arm/plat-omap/omap_device.c
View File

@ -385,17 +385,21 @@ static int _omap_device_notifier_call(struct notifier_block *nb,
unsigned long event, void *dev)
{
struct platform_device *pdev = to_platform_device(dev);
struct omap_device *od;
switch (event) {
case BUS_NOTIFY_ADD_DEVICE:
if (pdev->dev.of_node)
omap_device_build_from_dt(pdev);
break;
case BUS_NOTIFY_DEL_DEVICE:
if (pdev->archdata.od)
omap_device_delete(pdev->archdata.od);
break;
case BUS_NOTIFY_ADD_DEVICE:
if (pdev->dev.of_node)
omap_device_build_from_dt(pdev);
/* fall through */
default:
od = to_omap_device(pdev);
if (od)
od->_driver_status = event;
}
return NOTIFY_DONE;
@ -752,6 +756,10 @@ static int _od_suspend_noirq(struct device *dev)
struct omap_device *od = to_omap_device(pdev);
int ret;
/* Don't attempt late suspend on a driver that is not bound */
if (od->_driver_status != BUS_NOTIFY_BOUND_DRIVER)
return 0;
ret = pm_generic_suspend_noirq(dev);
if (!ret && !pm_runtime_status_suspended(dev)) {
@ -1125,3 +1133,41 @@ static int __init omap_device_init(void)
return 0;
}
core_initcall(omap_device_init);
/**
* omap_device_late_idle - idle devices without drivers
* @dev: struct device * associated with omap_device
* @data: unused
*
* Check the driver bound status of this device, and idle it
* if there is no driver attached.
*/
static int __init omap_device_late_idle(struct device *dev, void *data)
{
struct platform_device *pdev = to_platform_device(dev);
struct omap_device *od = to_omap_device(pdev);
if (!od)
return 0;
/*
* If omap_device state is enabled, but has no driver bound,
* idle it.
*/
if (od->_driver_status != BUS_NOTIFY_BOUND_DRIVER) {
if (od->_state == OMAP_DEVICE_STATE_ENABLED) {
dev_warn(dev, "%s: enabled but no driver. Idling\n",
__func__);
omap_device_idle(pdev);
}
}
return 0;
}
static int __init omap_device_late_init(void)
{
bus_for_each_dev(&platform_bus_type, NULL, NULL, omap_device_late_idle);
return 0;
}
late_initcall(omap_device_late_init);