mirror of https://gitee.com/openkylin/linux.git
USB: move PCI host controllers to new PM framework
This patch (as1236) converts the USB PCI power management routines over to the new PM framework. Signed-off-by: Alan Stern <stern@rowland.harvard.edu> Acked-by: Rafael J. Wysocki <rjw@sisk.pl> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Alan Stern
Greg Kroah-Hartman
parent
00240c3839
commit
abb306416a
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@ -185,180 +185,6 @@ void usb_hcd_pci_remove(struct pci_dev *dev)
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}
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EXPORT_SYMBOL_GPL(usb_hcd_pci_remove);
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#ifdef CONFIG_PM
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/**
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* usb_hcd_pci_suspend - power management suspend of a PCI-based HCD
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* @dev: USB Host Controller being suspended
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* @message: Power Management message describing this state transition
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*
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* Store this function in the HCD's struct pci_driver as .suspend.
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*/
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int usb_hcd_pci_suspend(struct pci_dev *dev, pm_message_t message)
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{
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struct usb_hcd *hcd = pci_get_drvdata(dev);
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int retval = 0;
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int wake, w;
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int has_pci_pm;
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/* Root hub suspend should have stopped all downstream traffic,
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* and all bus master traffic. And done so for both the interface
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* and the stub usb_device (which we check here). But maybe it
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* didn't; writing sysfs power/state files ignores such rules...
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*
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* We must ignore the FREEZE vs SUSPEND distinction here, because
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* otherwise the swsusp will save (and restore) garbage state.
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*/
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if (!(hcd->state == HC_STATE_SUSPENDED ||
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hcd->state == HC_STATE_HALT)) {
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dev_warn(&dev->dev, "Root hub is not suspended\n");
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retval = -EBUSY;
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goto done;
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}
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/* We might already be suspended (runtime PM -- not yet written) */
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if (dev->current_state != PCI_D0)
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goto done;
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if (hcd->driver->pci_suspend) {
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retval = hcd->driver->pci_suspend(hcd, message);
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suspend_report_result(hcd->driver->pci_suspend, retval);
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if (retval)
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goto done;
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}
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synchronize_irq(dev->irq);
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/* Downstream ports from this root hub should already be quiesced, so
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* there will be no DMA activity. Now we can shut down the upstream
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* link (except maybe for PME# resume signaling) and enter some PCI
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* low power state, if the hardware allows.
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*/
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pci_disable_device(dev);
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pci_save_state(dev);
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/* Don't fail on error to enable wakeup. We rely on pci code
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* to reject requests the hardware can't implement, rather
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* than coding the same thing.
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*/
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wake = (hcd->state == HC_STATE_SUSPENDED &&
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device_may_wakeup(&dev->dev));
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w = pci_wake_from_d3(dev, wake);
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if (w < 0)
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wake = w;
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dev_dbg(&dev->dev, "wakeup: %d\n", wake);
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/* Don't change state if we don't need to */
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if (message.event == PM_EVENT_FREEZE ||
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message.event == PM_EVENT_PRETHAW) {
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dev_dbg(&dev->dev, "--> no state change\n");
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goto done;
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}
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has_pci_pm = pci_find_capability(dev, PCI_CAP_ID_PM);
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if (!has_pci_pm) {
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dev_dbg(&dev->dev, "--> PCI D0 legacy\n");
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} else {
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/* NOTE: dev->current_state becomes nonzero only here, and
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* only for devices that support PCI PM. Also, exiting
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* PCI_D3 (but not PCI_D1 or PCI_D2) is allowed to reset
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* some device state (e.g. as part of clock reinit).
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*/
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retval = pci_set_power_state(dev, PCI_D3hot);
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suspend_report_result(pci_set_power_state, retval);
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if (retval == 0) {
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dev_dbg(&dev->dev, "--> PCI D3\n");
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} else {
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dev_dbg(&dev->dev, "PCI D3 suspend fail, %d\n",
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retval);
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pci_restore_state(dev);
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}
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}
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#ifdef CONFIG_PPC_PMAC
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if (retval == 0) {
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/* Disable ASIC clocks for USB */
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if (machine_is(powermac)) {
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struct device_node *of_node;
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of_node = pci_device_to_OF_node(dev);
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if (of_node)
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pmac_call_feature(PMAC_FTR_USB_ENABLE,
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of_node, 0, 0);
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}
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}
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#endif
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done:
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return retval;
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}
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EXPORT_SYMBOL_GPL(usb_hcd_pci_suspend);
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/**
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* usb_hcd_pci_resume - power management resume of a PCI-based HCD
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* @dev: USB Host Controller being resumed
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*
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* Store this function in the HCD's struct pci_driver as .resume.
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*/
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int usb_hcd_pci_resume(struct pci_dev *dev)
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{
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struct usb_hcd *hcd;
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int retval;
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#ifdef CONFIG_PPC_PMAC
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/* Reenable ASIC clocks for USB */
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if (machine_is(powermac)) {
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struct device_node *of_node;
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of_node = pci_device_to_OF_node(dev);
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if (of_node)
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pmac_call_feature(PMAC_FTR_USB_ENABLE,
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of_node, 0, 1);
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}
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#endif
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pci_restore_state(dev);
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hcd = pci_get_drvdata(dev);
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if (hcd->state != HC_STATE_SUSPENDED) {
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dev_dbg(hcd->self.controller,
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"can't resume, not suspended!\n");
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return 0;
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}
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pci_enable_wake(dev, PCI_D0, false);
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retval = pci_enable_device(dev);
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if (retval < 0) {
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dev_err(&dev->dev, "can't re-enable after resume, %d!\n",
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retval);
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return retval;
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}
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pci_set_master(dev);
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/* yes, ignore this result too... */
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(void) pci_wake_from_d3(dev, 0);
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clear_bit(HCD_FLAG_SAW_IRQ, &hcd->flags);
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if (hcd->driver->pci_resume) {
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retval = hcd->driver->pci_resume(hcd);
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if (retval) {
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dev_err(hcd->self.controller,
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"PCI post-resume error %d!\n", retval);
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usb_hc_died(hcd);
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}
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}
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return retval;
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}
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EXPORT_SYMBOL_GPL(usb_hcd_pci_resume);
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#endif /* CONFIG_PM */
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/**
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* usb_hcd_pci_shutdown - shutdown host controller
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* @dev: USB Host Controller being shutdown
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@ -376,3 +202,181 @@ void usb_hcd_pci_shutdown(struct pci_dev *dev)
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}
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EXPORT_SYMBOL_GPL(usb_hcd_pci_shutdown);
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#ifdef CONFIG_PM_SLEEP
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static int check_root_hub_suspended(struct device *dev)
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{
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struct pci_dev *pci_dev = to_pci_dev(dev);
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struct usb_hcd *hcd = pci_get_drvdata(pci_dev);
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if (!(hcd->state == HC_STATE_SUSPENDED ||
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hcd->state == HC_STATE_HALT)) {
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dev_warn(dev, "Root hub is not suspended\n");
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return -EBUSY;
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}
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return 0;
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}
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static int hcd_pci_suspend(struct device *dev)
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{
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struct pci_dev *pci_dev = to_pci_dev(dev);
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struct usb_hcd *hcd = pci_get_drvdata(pci_dev);
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int retval;
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/* Root hub suspend should have stopped all downstream traffic,
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* and all bus master traffic. And done so for both the interface
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* and the stub usb_device (which we check here). But maybe it
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* didn't; writing sysfs power/state files ignores such rules...
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*/
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retval = check_root_hub_suspended(dev);
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if (retval)
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return retval;
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/* We might already be suspended (runtime PM -- not yet written) */
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if (pci_dev->current_state != PCI_D0)
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return retval;
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if (hcd->driver->pci_suspend) {
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retval = hcd->driver->pci_suspend(hcd, PMSG_SUSPEND);
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suspend_report_result(hcd->driver->pci_suspend, retval);
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if (retval)
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return retval;
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}
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synchronize_irq(pci_dev->irq);
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/* Downstream ports from this root hub should already be quiesced, so
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* there will be no DMA activity. Now we can shut down the upstream
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* link (except maybe for PME# resume signaling). We'll enter a
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* low power state during suspend_noirq, if the hardware allows.
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*/
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pci_disable_device(pci_dev);
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return retval;
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}
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static int hcd_pci_suspend_noirq(struct device *dev)
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{
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struct pci_dev *pci_dev = to_pci_dev(dev);
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struct usb_hcd *hcd = pci_get_drvdata(pci_dev);
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int retval;
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retval = check_root_hub_suspended(dev);
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if (retval)
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return retval;
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pci_save_state(pci_dev);
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/* If the root hub is HALTed rather than SUSPENDed,
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* disallow remote wakeup.
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*/
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if (hcd->state == HC_STATE_HALT)
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device_set_wakeup_enable(dev, 0);
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dev_dbg(dev, "wakeup: %d\n", device_may_wakeup(dev));
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/* Possibly enable remote wakeup,
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* choose the appropriate low-power state, and go to that state.
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*/
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retval = pci_prepare_to_sleep(pci_dev);
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if (retval == -EIO) { /* Low-power not supported */
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dev_dbg(dev, "--> PCI D0 legacy\n");
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retval = 0;
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} else if (retval == 0) {
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dev_dbg(dev, "--> PCI %s\n",
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pci_power_name(pci_dev->current_state));
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} else {
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suspend_report_result(pci_prepare_to_sleep, retval);
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return retval;
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}
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#ifdef CONFIG_PPC_PMAC
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/* Disable ASIC clocks for USB */
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if (machine_is(powermac)) {
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struct device_node *of_node;
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of_node = pci_device_to_OF_node(pci_dev);
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if (of_node)
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pmac_call_feature(PMAC_FTR_USB_ENABLE, of_node, 0, 0);
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}
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#endif
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return retval;
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}
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static int hcd_pci_resume_noirq(struct device *dev)
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{
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struct pci_dev *pci_dev = to_pci_dev(dev);
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#ifdef CONFIG_PPC_PMAC
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/* Reenable ASIC clocks for USB */
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if (machine_is(powermac)) {
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struct device_node *of_node;
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of_node = pci_device_to_OF_node(pci_dev);
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if (of_node)
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pmac_call_feature(PMAC_FTR_USB_ENABLE,
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of_node, 0, 1);
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}
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#endif
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/* Go back to D0 and disable remote wakeup */
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pci_back_from_sleep(pci_dev);
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return 0;
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}
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static int resume_common(struct device *dev, bool hibernated)
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{
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struct pci_dev *pci_dev = to_pci_dev(dev);
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struct usb_hcd *hcd = pci_get_drvdata(pci_dev);
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int retval;
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if (hcd->state != HC_STATE_SUSPENDED) {
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dev_dbg(dev, "can't resume, not suspended!\n");
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return 0;
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}
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retval = pci_enable_device(pci_dev);
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if (retval < 0) {
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dev_err(dev, "can't re-enable after resume, %d!\n", retval);
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return retval;
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}
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pci_set_master(pci_dev);
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clear_bit(HCD_FLAG_SAW_IRQ, &hcd->flags);
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if (hcd->driver->pci_resume) {
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retval = hcd->driver->pci_resume(hcd);
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if (retval) {
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dev_err(dev, "PCI post-resume error %d!\n", retval);
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usb_hc_died(hcd);
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}
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}
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return retval;
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}
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static int hcd_pci_resume(struct device *dev)
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{
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return resume_common(dev, false);
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}
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static int hcd_pci_restore(struct device *dev)
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{
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return resume_common(dev, true);
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}
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struct dev_pm_ops usb_hcd_pci_pm_ops = {
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.suspend = hcd_pci_suspend,
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.suspend_noirq = hcd_pci_suspend_noirq,
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.resume_noirq = hcd_pci_resume_noirq,
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.resume = hcd_pci_resume,
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.freeze = check_root_hub_suspended,
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.freeze_noirq = check_root_hub_suspended,
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.thaw_noirq = NULL,
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.thaw = NULL,
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.poweroff = hcd_pci_suspend,
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.poweroff_noirq = hcd_pci_suspend_noirq,
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.restore_noirq = hcd_pci_resume_noirq,
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.restore = hcd_pci_restore,
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};
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EXPORT_SYMBOL_GPL(usb_hcd_pci_pm_ops);
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#endif /* CONFIG_PM_SLEEP */
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@ -261,14 +261,11 @@ struct pci_device_id;
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extern int usb_hcd_pci_probe(struct pci_dev *dev,
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const struct pci_device_id *id);
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extern void usb_hcd_pci_remove(struct pci_dev *dev);
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#ifdef CONFIG_PM
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extern int usb_hcd_pci_suspend(struct pci_dev *dev, pm_message_t msg);
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extern int usb_hcd_pci_resume(struct pci_dev *dev);
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#endif /* CONFIG_PM */
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extern void usb_hcd_pci_shutdown(struct pci_dev *dev);
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#ifdef CONFIG_PM_SLEEP
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extern struct dev_pm_ops usb_hcd_pci_pm_ops;
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#endif
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#endif /* CONFIG_PCI */
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/* pci-ish (pdev null is ok) buffer alloc/mapping support */
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@ -429,10 +429,11 @@ static struct pci_driver ehci_pci_driver = {
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.probe = usb_hcd_pci_probe,
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.remove = usb_hcd_pci_remove,
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#ifdef CONFIG_PM
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.suspend = usb_hcd_pci_suspend,
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.resume = usb_hcd_pci_resume,
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#endif
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.shutdown = usb_hcd_pci_shutdown,
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#ifdef CONFIG_PM_SLEEP
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.driver = {
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.pm = &usb_hcd_pci_pm_ops
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},
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#endif
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};
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@ -484,12 +484,11 @@ static struct pci_driver ohci_pci_driver = {
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.probe = usb_hcd_pci_probe,
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.remove = usb_hcd_pci_remove,
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#ifdef CONFIG_PM
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.suspend = usb_hcd_pci_suspend,
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.resume = usb_hcd_pci_resume,
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#endif
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.shutdown = usb_hcd_pci_shutdown,
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};
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#ifdef CONFIG_PM_SLEEP
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.driver = {
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.pm = &usb_hcd_pci_pm_ops
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},
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#endif
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};
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@ -940,10 +940,11 @@ static struct pci_driver uhci_pci_driver = {
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.remove = usb_hcd_pci_remove,
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.shutdown = uhci_shutdown,
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#ifdef CONFIG_PM
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.suspend = usb_hcd_pci_suspend,
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.resume = usb_hcd_pci_resume,
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#endif /* PM */
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#ifdef CONFIG_PM_SLEEP
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.driver = {
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.pm = &usb_hcd_pci_pm_ops
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},
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#endif
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};
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static int __init uhci_hcd_init(void)
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