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authorRafael J. Wysocki <rjw@sisk.pl>2009-01-20 01:26:56 +0100
committerGreg Kroah-Hartman <gregkh@kvm.kroah.org>2009-01-27 16:15:32 -0800
commita15d95a003fae154121733f049dd25e9c13dbef3 (patch)
tree240642794b6ceb19f733cf93709cf5b223b146e9
parentbcca06efea883bdf3803a0bb0ffa60f26730387d (diff)
USB: Fix suspend-resume of PCI USB controllers
Commit a0d4922da2e4ccb0973095d8d29f36f6b1b5f703 (USB: fix up suspend and resume for PCI host controllers) attempted to fix the suspend-resume of PCI USB controllers, but unfortunately it did that incorrectly and interrupts are left enabled by the USB controllers' ->suspend_late() callback as a result. This leads to serious problems during suspend which are very difficult to debug. Fix the issue by removing the ->suspend_late() callback of PCI USB controllers and moving the code from there to the ->suspend() callback executed with interrupts enabled. Additionally, make the ->resume() callback of PCI USB controllers execute pci_enable_wake(dev, PCI_D0, false) to disable wake-up from the full power state (PCI_D0). Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl> Tested-by: Andrey Borzenkov <arvidjaar@mail.ru> Tested-by: "Jeff Chua" <jeff.chua.linux@gmail.com> Cc: Alan Stern <stern@rowland.harvard.edu> Cc: Andrew Morton <akpm@linux-foundation.org> Cc: Christian Borntraeger <borntraeger@de.ibm.com> Cc: "Zdenek Kabelac" <zdenek.kabelac@gmail.com> Cc: Ingo Molnar <mingo@elte.hu> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
-rw-r--r--drivers/usb/core/hcd-pci.c116
-rw-r--r--drivers/usb/core/hcd.h1
-rw-r--r--drivers/usb/host/ehci-pci.c1
-rw-r--r--drivers/usb/host/ohci-pci.c1
-rw-r--r--drivers/usb/host/uhci-hcd.c1
5 files changed, 27 insertions, 93 deletions
diff --git a/drivers/usb/core/hcd-pci.c b/drivers/usb/core/hcd-pci.c
index 99432785f438..c54fc40458b1 100644
--- a/drivers/usb/core/hcd-pci.c
+++ b/drivers/usb/core/hcd-pci.c
@@ -200,6 +200,7 @@ int usb_hcd_pci_suspend(struct pci_dev *dev, pm_message_t message)
struct usb_hcd *hcd = pci_get_drvdata(dev);
int retval = 0;
int wake, w;
+ int has_pci_pm;
/* Root hub suspend should have stopped all downstream traffic,
* and all bus master traffic. And done so for both the interface
@@ -229,6 +230,15 @@ int usb_hcd_pci_suspend(struct pci_dev *dev, pm_message_t message)
synchronize_irq(dev->irq);
+ /* Downstream ports from this root hub should already be quiesced, so
+ * there will be no DMA activity. Now we can shut down the upstream
+ * link (except maybe for PME# resume signaling) and enter some PCI
+ * low power state, if the hardware allows.
+ */
+ pci_disable_device(dev);
+
+ pci_save_state(dev);
+
/* Don't fail on error to enable wakeup. We rely on pci code
* to reject requests the hardware can't implement, rather
* than coding the same thing.
@@ -240,35 +250,6 @@ int usb_hcd_pci_suspend(struct pci_dev *dev, pm_message_t message)
wake = w;
dev_dbg(&dev->dev, "wakeup: %d\n", wake);
- /* Downstream ports from this root hub should already be quiesced, so
- * there will be no DMA activity. Now we can shut down the upstream
- * link (except maybe for PME# resume signaling) and enter some PCI
- * low power state, if the hardware allows.
- */
- pci_disable_device(dev);
- done:
- return retval;
-}
-EXPORT_SYMBOL_GPL(usb_hcd_pci_suspend);
-
-/**
- * usb_hcd_pci_suspend_late - suspend a PCI-based HCD after IRQs are disabled
- * @dev: USB Host Controller being suspended
- * @message: Power Management message describing this state transition
- *
- * Store this function in the HCD's struct pci_driver as .suspend_late.
- */
-int usb_hcd_pci_suspend_late(struct pci_dev *dev, pm_message_t message)
-{
- int retval = 0;
- int has_pci_pm;
-
- /* We might already be suspended (runtime PM -- not yet written) */
- if (dev->current_state != PCI_D0)
- goto done;
-
- pci_save_state(dev);
-
/* Don't change state if we don't need to */
if (message.event == PM_EVENT_FREEZE ||
message.event == PM_EVENT_PRETHAW) {
@@ -314,7 +295,7 @@ int usb_hcd_pci_suspend_late(struct pci_dev *dev, pm_message_t message)
done:
return retval;
}
-EXPORT_SYMBOL_GPL(usb_hcd_pci_suspend_late);
+EXPORT_SYMBOL_GPL(usb_hcd_pci_suspend);
/**
* usb_hcd_pci_resume_early - resume a PCI-based HCD before IRQs are enabled
@@ -324,65 +305,8 @@ EXPORT_SYMBOL_GPL(usb_hcd_pci_suspend_late);
*/
int usb_hcd_pci_resume_early(struct pci_dev *dev)
{
- int retval = 0;
- pci_power_t state = dev->current_state;
-
-#ifdef CONFIG_PPC_PMAC
- /* Reenable ASIC clocks for USB */
- if (machine_is(powermac)) {
- struct device_node *of_node;
-
- of_node = pci_device_to_OF_node(dev);
- if (of_node)
- pmac_call_feature(PMAC_FTR_USB_ENABLE,
- of_node, 0, 1);
- }
-#endif
-
- /* NOTE: chip docs cover clean "real suspend" cases (what Linux
- * calls "standby", "suspend to RAM", and so on). There are also
- * dirty cases when swsusp fakes a suspend in "shutdown" mode.
- */
- if (state != PCI_D0) {
-#ifdef DEBUG
- int pci_pm;
- u16 pmcr;
-
- pci_pm = pci_find_capability(dev, PCI_CAP_ID_PM);
- pci_read_config_word(dev, pci_pm + PCI_PM_CTRL, &pmcr);
- pmcr &= PCI_PM_CTRL_STATE_MASK;
- if (pmcr) {
- /* Clean case: power to USB and to HC registers was
- * maintained; remote wakeup is easy.
- */
- dev_dbg(&dev->dev, "resume from PCI D%d\n", pmcr);
- } else {
- /* Clean: HC lost Vcc power, D0 uninitialized
- * + Vaux may have preserved port and transceiver
- * state ... for remote wakeup from D3cold
- * + or not; HCD must reinit + re-enumerate
- *
- * Dirty: D0 semi-initialized cases with swsusp
- * + after BIOS init
- * + after Linux init (HCD statically linked)
- */
- dev_dbg(&dev->dev, "resume from previous PCI D%d\n",
- state);
- }
-#endif
-
- retval = pci_set_power_state(dev, PCI_D0);
- } else {
- /* Same basic cases: clean (powered/not), dirty */
- dev_dbg(&dev->dev, "PCI legacy resume\n");
- }
-
- if (retval < 0)
- dev_err(&dev->dev, "can't resume: %d\n", retval);
- else
- pci_restore_state(dev);
-
- return retval;
+ pci_restore_state(dev);
+ return 0;
}
EXPORT_SYMBOL_GPL(usb_hcd_pci_resume_early);
@@ -397,6 +321,18 @@ int usb_hcd_pci_resume(struct pci_dev *dev)
struct usb_hcd *hcd;
int retval;
+#ifdef CONFIG_PPC_PMAC
+ /* Reenable ASIC clocks for USB */
+ if (machine_is(powermac)) {
+ struct device_node *of_node;
+
+ of_node = pci_device_to_OF_node(dev);
+ if (of_node)
+ pmac_call_feature(PMAC_FTR_USB_ENABLE,
+ of_node, 0, 1);
+ }
+#endif
+
hcd = pci_get_drvdata(dev);
if (hcd->state != HC_STATE_SUSPENDED) {
dev_dbg(hcd->self.controller,
@@ -404,6 +340,8 @@ int usb_hcd_pci_resume(struct pci_dev *dev)
return 0;
}
+ pci_enable_wake(dev, PCI_D0, false);
+
retval = pci_enable_device(dev);
if (retval < 0) {
dev_err(&dev->dev, "can't re-enable after resume, %d!\n",
diff --git a/drivers/usb/core/hcd.h b/drivers/usb/core/hcd.h
index 572d2cf46e8d..5b94a56bec23 100644
--- a/drivers/usb/core/hcd.h
+++ b/drivers/usb/core/hcd.h
@@ -257,7 +257,6 @@ extern void usb_hcd_pci_remove(struct pci_dev *dev);
#ifdef CONFIG_PM
extern int usb_hcd_pci_suspend(struct pci_dev *dev, pm_message_t msg);
-extern int usb_hcd_pci_suspend_late(struct pci_dev *dev, pm_message_t msg);
extern int usb_hcd_pci_resume_early(struct pci_dev *dev);
extern int usb_hcd_pci_resume(struct pci_dev *dev);
#endif /* CONFIG_PM */
diff --git a/drivers/usb/host/ehci-pci.c b/drivers/usb/host/ehci-pci.c
index 9faa5c8fe025..bb21fb0a4969 100644
--- a/drivers/usb/host/ehci-pci.c
+++ b/drivers/usb/host/ehci-pci.c
@@ -432,7 +432,6 @@ static struct pci_driver ehci_pci_driver = {
#ifdef CONFIG_PM
.suspend = usb_hcd_pci_suspend,
- .suspend_late = usb_hcd_pci_suspend_late,
.resume_early = usb_hcd_pci_resume_early,
.resume = usb_hcd_pci_resume,
#endif
diff --git a/drivers/usb/host/ohci-pci.c b/drivers/usb/host/ohci-pci.c
index 8b28ae7865ba..5d625c3fd423 100644
--- a/drivers/usb/host/ohci-pci.c
+++ b/drivers/usb/host/ohci-pci.c
@@ -487,7 +487,6 @@ static struct pci_driver ohci_pci_driver = {
#ifdef CONFIG_PM
.suspend = usb_hcd_pci_suspend,
- .suspend_late = usb_hcd_pci_suspend_late,
.resume_early = usb_hcd_pci_resume_early,
.resume = usb_hcd_pci_resume,
#endif
diff --git a/drivers/usb/host/uhci-hcd.c b/drivers/usb/host/uhci-hcd.c
index 4e221060f58c..944f7e0ca4df 100644
--- a/drivers/usb/host/uhci-hcd.c
+++ b/drivers/usb/host/uhci-hcd.c
@@ -942,7 +942,6 @@ static struct pci_driver uhci_pci_driver = {
#ifdef CONFIG_PM
.suspend = usb_hcd_pci_suspend,
- .suspend_late = usb_hcd_pci_suspend_late,
.resume_early = usb_hcd_pci_resume_early,
.resume = usb_hcd_pci_resume,
#endif /* PM */