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authorRafael J. Wysocki <rafael.j.wysocki@intel.com>2012-11-26 13:04:53 +0400
committerRafael J. Wysocki <rafael.j.wysocki@intel.com>2012-11-27 16:44:45 +0400
commit94d76d5de38d7502c3e78fcd6bf50da95e3e0361 (patch)
tree855aec097310ea4e59ef843d748d8e87e4eeac21 /drivers/base
parent45c36462aef0cccadb7755ea4edc78d13334a2be (diff)
downloadlinux-94d76d5de38d7502c3e78fcd6bf50da95e3e0361.tar.xz
platform / ACPI: Attach/detach ACPI PM during probe/remove/shutdown
Drivers usually expect that the devices they are supposed to handle will be operational when their .probe() routines are called, but that need not be the case on some ACPI-based systems with ACPI-based device enumeration where the BIOSes don't put devices into D0 by default. To work around this problem it is sufficient to change bus type .probe() routines to ensure that devices will be powered on before the drivers' .probe() routines run (and their .remove() and .shutdown() routines accordingly). Modify platform_drv_probe() to run acpi_dev_pm_attach() for devices whose ACPI handles are present, so that ACPI power management is used to change their power states. Analogously, modify platform_drv_remove() and platform_drv_shutdown() to call acpi_dev_pm_detach() for those devices, so that they are not subject to ACPI PM any more. Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com> Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Reviewed-by: Mika Westerberg <mika.westerberg@linux.intel.com> Tested-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Diffstat (limited to 'drivers/base')
-rw-r--r--drivers/base/platform.c19
1 files changed, 17 insertions, 2 deletions
diff --git a/drivers/base/platform.c b/drivers/base/platform.c
index 49fd96e23460..b2ee3bcd5a41 100644
--- a/drivers/base/platform.c
+++ b/drivers/base/platform.c
@@ -484,8 +484,16 @@ static int platform_drv_probe(struct device *_dev)
{
struct platform_driver *drv = to_platform_driver(_dev->driver);
struct platform_device *dev = to_platform_device(_dev);
+ int ret;
- return drv->probe(dev);
+ if (ACPI_HANDLE(_dev))
+ acpi_dev_pm_attach(_dev, true);
+
+ ret = drv->probe(dev);
+ if (ret && ACPI_HANDLE(_dev))
+ acpi_dev_pm_detach(_dev, true);
+
+ return ret;
}
static int platform_drv_probe_fail(struct device *_dev)
@@ -497,8 +505,13 @@ static int platform_drv_remove(struct device *_dev)
{
struct platform_driver *drv = to_platform_driver(_dev->driver);
struct platform_device *dev = to_platform_device(_dev);
+ int ret;
- return drv->remove(dev);
+ ret = drv->remove(dev);
+ if (ACPI_HANDLE(_dev))
+ acpi_dev_pm_detach(_dev, true);
+
+ return ret;
}
static void platform_drv_shutdown(struct device *_dev)
@@ -507,6 +520,8 @@ static void platform_drv_shutdown(struct device *_dev)
struct platform_device *dev = to_platform_device(_dev);
drv->shutdown(dev);
+ if (ACPI_HANDLE(_dev))
+ acpi_dev_pm_detach(_dev, true);
}
/**