#include <linux/sched.h>
#include <linux/cpu.h>
#include <linux/pm_runtime.h>
+#include <linux/suspend.h>
#include "pci.h"
struct pci_dynid {
struct device_driver *drv = dev->driver;
int error = 0;
+ /*
+ * If a PCI device configured to wake up the system from sleep states
+ * has been suspended at run time and there's a resume request pending
+ * for it, this is equivalent to the device signaling wakeup, so the
+ * system suspend operation should be aborted.
+ */
+ pm_runtime_get_noresume(dev);
+ if (pm_runtime_barrier(dev) && device_may_wakeup(dev))
+ pm_wakeup_event(dev, 0);
+
+ if (pm_wakeup_pending()) {
+ pm_runtime_put_sync(dev);
+ return -EBUSY;
+ }
+
/*
* PCI devices suspended at run time need to be resumed at this
* point, because in general it is necessary to reconfigure them for
* system from the sleep state, we'll have to prevent it from signaling
* wake-up.
*/
- pm_runtime_get_sync(dev);
+ pm_runtime_resume(dev);
if (drv && drv->pm && drv->pm->prepare)
error = drv->pm->prepare(dev);
pci_pm_set_unknown_state(pci_dev);
+ /*
+ * Some BIOSes from ASUS have a bug: If a USB EHCI host controller's
+ * PCI COMMAND register isn't 0, the BIOS assumes that the controller
+ * hasn't been quiesced and tries to turn it off. If the controller
+ * is already in D3, this can hang or cause memory corruption.
+ *
+ * Since the value of the COMMAND register doesn't matter once the
+ * device has been suspended, we can safely set it to 0 here.
+ */
+ if (pci_dev->class == PCI_CLASS_SERIAL_USB_EHCI)
+ pci_write_config_word(pci_dev, PCI_COMMAND, 0);
+
return 0;
}
if (pci_has_legacy_pm_support(pci_dev))
return pci_legacy_resume_early(dev);
- pci_update_current_state(pci_dev, PCI_D0);
+ /*
+ * pci_restore_state() requires the device to be in D0 (because of MSI
+ * restoration among other things), so force it into D0 in case the
+ * driver's "freeze" callbacks put it into a low-power state directly.
+ */
+ pci_set_power_state(pci_dev, PCI_D0);
+ pci_restore_state(pci_dev);
if (drv && drv->pm && drv->pm->thaw_noirq)
error = drv->pm->thaw_noirq(dev);
if (!pci_dev->state_saved && !pci_is_bridge(pci_dev))
pci_prepare_to_sleep(pci_dev);
+ /*
+ * The reason for doing this here is the same as for the analogous code
+ * in pci_pm_suspend_noirq().
+ */
+ if (pci_dev->class == PCI_CLASS_SERIAL_USB_EHCI)
+ pci_write_config_word(pci_dev, PCI_COMMAND, 0);
+
return 0;
}