diff options
| -rw-r--r-- | drivers/usb/host/ohci-hub.c | 60 |
1 files changed, 32 insertions, 28 deletions
diff --git a/drivers/usb/host/ohci-hub.c b/drivers/usb/host/ohci-hub.c index 7ea9a7b3115..a150e85c901 100644 --- a/drivers/usb/host/ohci-hub.c +++ b/drivers/usb/host/ohci-hub.c @@ -362,18 +362,23 @@ static int ohci_root_hub_state_changes(struct ohci_hcd *ohci, int changed, int any_connected) { int poll_rh = 1; - int rhsc; + int rhsc_status, rhsc_enable; - rhsc = ohci_readl(ohci, &ohci->regs->intrenable) & OHCI_INTR_RHSC; - switch (ohci->hc_control & OHCI_CTRL_HCFS) { + /* Some broken controllers never turn off RHCS in the interrupt + * status register. For their sake we won't re-enable RHSC + * interrupts if the interrupt bit is already active. + */ + rhsc_status = ohci_readl(ohci, &ohci->regs->intrstatus) & + OHCI_INTR_RHSC; + rhsc_enable = ohci_readl(ohci, &ohci->regs->intrenable) & + OHCI_INTR_RHSC; + switch (ohci->hc_control & OHCI_CTRL_HCFS) { case OHCI_USB_OPER: - /* If no status changes are pending, enable status-change - * interrupts. - */ - if (!rhsc && !changed) { - rhsc = OHCI_INTR_RHSC; - ohci_writel(ohci, rhsc, &ohci->regs->intrenable); + /* If no status changes are pending, enable RHSC interrupts. */ + if (!rhsc_enable && !rhsc_status && !changed) { + rhsc_enable = OHCI_INTR_RHSC; + ohci_writel(ohci, rhsc_enable, &ohci->regs->intrenable); } /* Keep on polling until we know a device is connected @@ -383,7 +388,7 @@ static int ohci_root_hub_state_changes(struct ohci_hcd *ohci, int changed, if (any_connected || !device_may_wakeup(&ohci_to_hcd(ohci) ->self.root_hub->dev)) { - if (rhsc) + if (rhsc_enable) poll_rh = 0; } else { ohci->autostop = 1; @@ -396,34 +401,36 @@ static int ohci_root_hub_state_changes(struct ohci_hcd *ohci, int changed, ohci->autostop = 0; ohci->next_statechange = jiffies + STATECHANGE_DELAY; - } else if (rhsc && time_after_eq(jiffies, + } else if (time_after_eq(jiffies, ohci->next_statechange) && !ohci->ed_rm_list && !(ohci->hc_control & OHCI_SCHED_ENABLES)) { ohci_rh_suspend(ohci, 1); - poll_rh = 0; + if (rhsc_enable) + poll_rh = 0; } } break; - /* if there is a port change, autostart or ask to be resumed */ case OHCI_USB_SUSPEND: case OHCI_USB_RESUME: + /* if there is a port change, autostart or ask to be resumed */ if (changed) { if (ohci->autostop) ohci_rh_resume(ohci); else usb_hcd_resume_root_hub(ohci_to_hcd(ohci)); } else { - if (!rhsc && (ohci->autostop || + if (!rhsc_enable && !rhsc_status && (ohci->autostop || ohci_to_hcd(ohci)->self.root_hub-> - do_remote_wakeup)) - ohci_writel(ohci, OHCI_INTR_RHSC, + do_remote_wakeup)) { + rhsc_enable = OHCI_INTR_RHSC; + ohci_writel(ohci, rhsc_enable, &ohci->regs->intrenable); - - /* everything is idle, no need for polling */ - poll_rh = 0; + } + if (rhsc_enable) + poll_rh = 0; } break; } @@ -443,12 +450,16 @@ static inline int ohci_rh_resume(struct ohci_hcd *ohci) static int ohci_root_hub_state_changes(struct ohci_hcd *ohci, int changed, int any_connected) { + int rhsc_status; + /* If RHSC is enabled, don't poll */ if (ohci_readl(ohci, &ohci->regs->intrenable) & OHCI_INTR_RHSC) return 0; - /* If no status changes are pending, enable status-change interrupts */ - if (!changed) { + /* If no status changes are pending, enable RHSC interrupts */ + rhsc_status = ohci_readl(ohci, &ohci->regs->intrstatus) & + OHCI_INTR_RHSC; + if (!changed && !rhsc_status) { ohci_writel(ohci, OHCI_INTR_RHSC, &ohci->regs->intrenable); return 0; } @@ -492,13 +503,6 @@ ohci_hub_status_data (struct usb_hcd *hcd, char *buf) length++; } - /* Some broken controllers never turn off RHCS in the interrupt - * status register. For their sake we won't re-enable RHSC - * interrupts if the flag is already set. - */ - if (ohci_readl(ohci, &ohci->regs->intrstatus) & OHCI_INTR_RHSC) - changed = 1; - /* look at each port */ for (i = 0; i < ohci->num_ports; i++) { u32 status = roothub_portstatus (ohci, i); |