diff options
Diffstat (limited to 'drivers/usb/core')
| -rw-r--r-- | drivers/usb/core/driver.c | 8 | ||||
| -rw-r--r-- | drivers/usb/core/hcd-pci.c | 127 |
2 files changed, 134 insertions, 1 deletions
diff --git a/drivers/usb/core/driver.c b/drivers/usb/core/driver.c index 60a45f1..f2f055e 100644 --- a/drivers/usb/core/driver.c +++ b/drivers/usb/core/driver.c @@ -1022,6 +1022,14 @@ static int usb_resume_device(struct usb_device *udev, pm_message_t msg) goto done; } + /* Non-root devices on a full/low-speed bus must wait for their + * companion high-speed root hub, in case a handoff is needed. + */ + if (!(msg.event & PM_EVENT_AUTO) && udev->parent && + udev->bus->hs_companion) + device_pm_wait_for_dev(&udev->dev, + &udev->bus->hs_companion->root_hub->dev); + if (udev->quirks & USB_QUIRK_RESET_RESUME) udev->reset_resume = 1; diff --git a/drivers/usb/core/hcd-pci.c b/drivers/usb/core/hcd-pci.c index 2dcf906..1528653 100644 --- a/drivers/usb/core/hcd-pci.c +++ b/drivers/usb/core/hcd-pci.c @@ -19,6 +19,7 @@ #include <linux/kernel.h> #include <linux/module.h> #include <linux/pci.h> +#include <linux/pm_runtime.h> #include <linux/usb.h> #include <asm/io.h> @@ -37,6 +38,122 @@ /* PCI-based HCs are common, but plenty of non-PCI HCs are used too */ +#ifdef CONFIG_PM_SLEEP + +/* Coordinate handoffs between EHCI and companion controllers + * during system resume + */ + +static DEFINE_MUTEX(companions_mutex); + +#define CL_UHCI PCI_CLASS_SERIAL_USB_UHCI +#define CL_OHCI PCI_CLASS_SERIAL_USB_OHCI +#define CL_EHCI PCI_CLASS_SERIAL_USB_EHCI + +enum companion_action { + SET_HS_COMPANION, CLEAR_HS_COMPANION, WAIT_FOR_COMPANIONS +}; + +static void companion_common(struct pci_dev *pdev, struct usb_hcd *hcd, + enum companion_action action) +{ + struct pci_dev *companion; + struct usb_hcd *companion_hcd; + unsigned int slot = PCI_SLOT(pdev->devfn); + + /* Iterate through other PCI functions in the same slot. + * If pdev is OHCI or UHCI then we are looking for EHCI, and + * vice versa. + */ + companion = NULL; + for (;;) { + companion = pci_get_device(PCI_ANY_ID, PCI_ANY_ID, companion); + if (!companion) + break; + if (companion->bus != pdev->bus || + PCI_SLOT(companion->devfn) != slot) + continue; + + companion_hcd = pci_get_drvdata(companion); + if (!companion_hcd) + continue; + + /* For SET_HS_COMPANION, store a pointer to the EHCI bus in + * the OHCI/UHCI companion bus structure. + * For CLEAR_HS_COMPANION, clear the pointer to the EHCI bus + * in the OHCI/UHCI companion bus structure. + * For WAIT_FOR_COMPANIONS, wait until the OHCI/UHCI + * companion controllers have fully resumed. + */ + + if ((pdev->class == CL_OHCI || pdev->class == CL_UHCI) && + companion->class == CL_EHCI) { + /* action must be SET_HS_COMPANION */ + dev_dbg(&companion->dev, "HS companion for %s\n", + dev_name(&pdev->dev)); + hcd->self.hs_companion = &companion_hcd->self; + + } else if (pdev->class == CL_EHCI && + (companion->class == CL_OHCI || + companion->class == CL_UHCI)) { + switch (action) { + case SET_HS_COMPANION: + dev_dbg(&pdev->dev, "HS companion for %s\n", + dev_name(&companion->dev)); + companion_hcd->self.hs_companion = &hcd->self; + break; + case CLEAR_HS_COMPANION: + companion_hcd->self.hs_companion = NULL; + break; + case WAIT_FOR_COMPANIONS: + device_pm_wait_for_dev(&pdev->dev, + &companion->dev); + break; + } + } + } +} + +static void set_hs_companion(struct pci_dev *pdev, struct usb_hcd *hcd) +{ + mutex_lock(&companions_mutex); + dev_set_drvdata(&pdev->dev, hcd); + companion_common(pdev, hcd, SET_HS_COMPANION); + mutex_unlock(&companions_mutex); +} + +static void clear_hs_companion(struct pci_dev *pdev, struct usb_hcd *hcd) +{ + mutex_lock(&companions_mutex); + dev_set_drvdata(&pdev->dev, NULL); + + /* If pdev is OHCI or UHCI, just clear its hs_companion pointer */ + if (pdev->class == CL_OHCI || pdev->class == CL_UHCI) + hcd->self.hs_companion = NULL; + + /* Otherwise search for companion buses and clear their pointers */ + else + companion_common(pdev, hcd, CLEAR_HS_COMPANION); + mutex_unlock(&companions_mutex); +} + +static void wait_for_companions(struct pci_dev *pdev, struct usb_hcd *hcd) +{ + /* Only EHCI controllers need to wait. + * No locking is needed because a controller cannot be resumed + * while one of its companions is getting unbound. + */ + if (pdev->class == CL_EHCI) + companion_common(pdev, hcd, WAIT_FOR_COMPANIONS); +} + +#else /* !CONFIG_PM_SLEEP */ + +static inline void set_hs_companion(struct pci_dev *d, struct usb_hcd *h) {} +static inline void clear_hs_companion(struct pci_dev *d, struct usb_hcd *h) {} +static inline void wait_for_companions(struct pci_dev *d, struct usb_hcd *h) {} + +#endif /* !CONFIG_PM_SLEEP */ /*-------------------------------------------------------------------------*/ @@ -123,7 +240,7 @@ int usb_hcd_pci_probe(struct pci_dev *dev, const struct pci_device_id *id) if (region == PCI_ROM_RESOURCE) { dev_dbg(&dev->dev, "no i/o regions available\n"); retval = -EBUSY; - goto err1; + goto err2; } } @@ -132,6 +249,7 @@ int usb_hcd_pci_probe(struct pci_dev *dev, const struct pci_device_id *id) retval = usb_add_hcd(hcd, dev->irq, IRQF_DISABLED | IRQF_SHARED); if (retval != 0) goto err4; + set_hs_companion(dev, hcd); return retval; err4: @@ -142,6 +260,7 @@ int usb_hcd_pci_probe(struct pci_dev *dev, const struct pci_device_id *id) } else release_region(hcd->rsrc_start, hcd->rsrc_len); err2: + clear_hs_companion(dev, hcd); usb_put_hcd(hcd); err1: pci_disable_device(dev); @@ -180,6 +299,7 @@ void usb_hcd_pci_remove(struct pci_dev *dev) } else { release_region(hcd->rsrc_start, hcd->rsrc_len); } + clear_hs_companion(dev, hcd); usb_put_hcd(hcd); pci_disable_device(dev); } @@ -344,6 +464,11 @@ static int resume_common(struct device *dev, bool hibernated) clear_bit(HCD_FLAG_SAW_IRQ, &hcd->flags); if (hcd->driver->pci_resume) { + /* This call should be made only during system resume, + * not during runtime resume. + */ + wait_for_companions(pci_dev, hcd); + retval = hcd->driver->pci_resume(hcd, hibernated); if (retval) { dev_err(dev, "PCI post-resume error %d!\n", retval); |