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authorRafael J. Wysocki <rjw@sisk.pl>2008-02-23 19:13:25 +0100
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2008-02-23 10:40:04 -0800
commit3a2d5b700132f35401f1d9e22fe3c2cab02c2549 (patch)
treead991428c41aee92a5f78b06bf73430af0e6f7ae /drivers/usb
parent39273b58a409cd6d65c9732bdca00bacd1626672 (diff)
PM: Introduce PM_EVENT_HIBERNATE callback state
During the last step of hibernation in the "platform" mode (with the help of ACPI) we use the suspend code, including the devices' ->suspend() methods, to prepare the system for entering the ACPI S4 system sleep state. But at least for some devices the operations performed by the ->suspend() callback in that case must be different from its operations during regular suspend. For this reason, introduce the new PM event type PM_EVENT_HIBERNATE and pass it to the device drivers' ->suspend() methods during the last phase of hibernation, so that they can distinguish this case and handle it as appropriate. Modify the drivers that handle PM_EVENT_SUSPEND in a special way and need to handle PM_EVENT_HIBERNATE in the same way. These changes are necessary to fix a hibernation regression related to the i915 driver (ref. http://lkml.org/lkml/2008/2/22/488). Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl> Acked-by: Pavel Machek <pavel@ucw.cz> Tested-by: Jeff Chua <jeff.chua.linux@gmail.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'drivers/usb')
-rw-r--r--drivers/usb/host/sl811-hcd.c1
-rw-r--r--drivers/usb/host/u132-hcd.c11
2 files changed, 9 insertions, 3 deletions
diff --git a/drivers/usb/host/sl811-hcd.c b/drivers/usb/host/sl811-hcd.c
index ba370c56172c..59be276ccd9d 100644
--- a/drivers/usb/host/sl811-hcd.c
+++ b/drivers/usb/host/sl811-hcd.c
@@ -1766,6 +1766,7 @@ sl811h_suspend(struct platform_device *dev, pm_message_t state)
retval = sl811h_bus_suspend(hcd);
break;
case PM_EVENT_SUSPEND:
+ case PM_EVENT_HIBERNATE:
case PM_EVENT_PRETHAW: /* explicitly discard hw state */
port_power(sl811, 0);
break;
diff --git a/drivers/usb/host/u132-hcd.c b/drivers/usb/host/u132-hcd.c
index ac283b09a63f..6fca06961559 100644
--- a/drivers/usb/host/u132-hcd.c
+++ b/drivers/usb/host/u132-hcd.c
@@ -3214,14 +3214,19 @@ static int u132_suspend(struct platform_device *pdev, pm_message_t state)
return -ESHUTDOWN;
} else {
int retval = 0;
- if (state.event == PM_EVENT_FREEZE) {
+
+ switch (state.event) {
+ case PM_EVENT_FREEZE:
retval = u132_bus_suspend(hcd);
- } else if (state.event == PM_EVENT_SUSPEND) {
+ break;
+ case PM_EVENT_SUSPEND:
+ case PM_EVENT_HIBERNATE:
int ports = MAX_U132_PORTS;
while (ports-- > 0) {
port_power(u132, ports, 0);
}
- }
+ break;
+ }
if (retval == 0)
pdev->dev.power.power_state = state;
return retval;