diff options
| -rw-r--r-- | drivers/usb/host/ohci-hcd.c | 18 | ||||
| -rw-r--r-- | drivers/usb/host/ohci-hub.c | 229 | ||||
| -rw-r--r-- | drivers/usb/host/ohci.h | 1 |
3 files changed, 164 insertions, 84 deletions
diff --git a/drivers/usb/host/ohci-hcd.c b/drivers/usb/host/ohci-hcd.c index 1027aa04583d..d1d68c402251 100644 --- a/drivers/usb/host/ohci-hcd.c +++ b/drivers/usb/host/ohci-hcd.c @@ -715,17 +715,8 @@ static irqreturn_t ohci_irq (struct usb_hcd *hcd, struct pt_regs *ptregs) return IRQ_NOTMINE; } - /* NOTE: vendors didn't always make the same implementation - * choices for RHSC. Sometimes it triggers on an edge (like - * setting and maybe clearing a port status change bit); and - * it's level-triggered on other silicon, active until khubd - * clears all active port status change bits. Poll by timer - * til it's fully debounced and the difference won't matter. - */ if (ints & OHCI_INTR_RHSC) { ohci_vdbg (ohci, "rhsc\n"); - ohci_writel (ohci, OHCI_INTR_RHSC, ®s->intrdisable); - hcd->poll_rh = 1; ohci->next_statechange = jiffies + STATECHANGE_DELAY; ohci_writel (ohci, OHCI_INTR_RHSC, ®s->intrstatus); usb_hcd_poll_rh_status(hcd); @@ -743,13 +734,18 @@ static irqreturn_t ohci_irq (struct usb_hcd *hcd, struct pt_regs *ptregs) if (ints & OHCI_INTR_RD) { ohci_vdbg (ohci, "resume detect\n"); ohci_writel (ohci, OHCI_INTR_RD, ®s->intrstatus); - if (hcd->state != HC_STATE_QUIESCING) + hcd->poll_rh = 1; + if (ohci->autostop) { + spin_lock (&ohci->lock); + ohci_rh_resume (ohci); + spin_unlock (&ohci->lock); + } else usb_hcd_resume_root_hub(hcd); } if (ints & OHCI_INTR_WDH) { if (HC_IS_RUNNING(hcd->state)) - ohci_writel (ohci, OHCI_INTR_WDH, ®s->intrdisable); + ohci_writel (ohci, OHCI_INTR_WDH, ®s->intrdisable); spin_lock (&ohci->lock); dl_done_list (ohci, ptregs); spin_unlock (&ohci->lock); diff --git a/drivers/usb/host/ohci-hub.c b/drivers/usb/host/ohci-hub.c index ef4965450de5..f36cbd02736d 100644 --- a/drivers/usb/host/ohci-hub.c +++ b/drivers/usb/host/ohci-hub.c @@ -41,31 +41,20 @@ static void ohci_rhsc_enable (struct usb_hcd *hcd) { struct ohci_hcd *ohci = hcd_to_ohci (hcd); - hcd->poll_rh = 0; ohci_writel (ohci, OHCI_INTR_RHSC, &ohci->regs->intrenable); } -#ifdef CONFIG_PM - #define OHCI_SCHED_ENABLES \ (OHCI_CTRL_CLE|OHCI_CTRL_BLE|OHCI_CTRL_PLE|OHCI_CTRL_IE) static void dl_done_list (struct ohci_hcd *, struct pt_regs *); static void finish_unlinks (struct ohci_hcd *, u16 , struct pt_regs *); -static int ohci_restart (struct ohci_hcd *ohci); -static int ohci_bus_suspend (struct usb_hcd *hcd) +static int ohci_rh_suspend (struct ohci_hcd *ohci, int autostop) +__releases(ohci->lock) +__acquires(ohci->lock) { - struct ohci_hcd *ohci = hcd_to_ohci (hcd); int status = 0; - unsigned long flags; - - spin_lock_irqsave (&ohci->lock, flags); - - if (unlikely(!test_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags))) { - spin_unlock_irqrestore (&ohci->lock, flags); - return -ESHUTDOWN; - } ohci->hc_control = ohci_readl (ohci, &ohci->regs->control); switch (ohci->hc_control & OHCI_CTRL_HCFS) { @@ -81,15 +70,16 @@ static int ohci_bus_suspend (struct usb_hcd *hcd) ohci_dbg (ohci, "needs reinit!\n"); goto done; case OHCI_USB_SUSPEND: - ohci_dbg (ohci, "already suspended\n"); - goto done; + if (!ohci->autostop) { + ohci_dbg (ohci, "already suspended\n"); + goto done; + } } - ohci_dbg (ohci, "suspend root hub\n"); + ohci_dbg (ohci, "%s root hub\n", + autostop ? "auto-stop" : "suspend"); /* First stop any processing */ - if (ohci->hc_control & OHCI_SCHED_ENABLES) { - int limit; - + if (!autostop && (ohci->hc_control & OHCI_SCHED_ENABLES)) { ohci->hc_control &= ~OHCI_SCHED_ENABLES; ohci_writel (ohci, ohci->hc_control, &ohci->regs->control); ohci->hc_control = ohci_readl (ohci, &ohci->regs->control); @@ -99,24 +89,17 @@ static int ohci_bus_suspend (struct usb_hcd *hcd) * then the last WDH could take 6+ msec */ ohci_dbg (ohci, "stopping schedules ...\n"); - limit = 2000; - while (limit > 0) { - udelay (250); - limit =- 250; - if (ohci_readl (ohci, &ohci->regs->intrstatus) - & OHCI_INTR_SF) - break; - } - dl_done_list (ohci, NULL); - mdelay (7); + ohci->autostop = 0; + spin_unlock_irq (&ohci->lock); + msleep (8); + spin_lock_irq (&ohci->lock); } dl_done_list (ohci, NULL); finish_unlinks (ohci, ohci_frame_no(ohci), NULL); - ohci_writel (ohci, ohci_readl (ohci, &ohci->regs->intrstatus), - &ohci->regs->intrstatus); /* maybe resume can wake root hub */ - if (device_may_wakeup(&ohci_to_hcd(ohci)->self.root_hub->dev)) + if (device_may_wakeup(&ohci_to_hcd(ohci)->self.root_hub->dev) || + autostop) ohci->hc_control |= OHCI_CTRL_RWE; else { ohci_writel (ohci, OHCI_INTR_RHSC, &ohci->regs->intrdisable); @@ -132,13 +115,12 @@ static int ohci_bus_suspend (struct usb_hcd *hcd) (void) ohci_readl (ohci, &ohci->regs->control); /* no resumes until devices finish suspending */ - ohci->next_statechange = jiffies + msecs_to_jiffies (5); - - /* no timer polling */ - hcd->poll_rh = 0; + if (!autostop) { + ohci->next_statechange = jiffies + msecs_to_jiffies (5); + ohci->autostop = 0; + } done: - spin_unlock_irqrestore (&ohci->lock, flags); return status; } @@ -151,24 +133,16 @@ static inline struct ed *find_head (struct ed *ed) } /* caller has locked the root hub */ -static int ohci_bus_resume (struct usb_hcd *hcd) +static int ohci_rh_resume (struct ohci_hcd *ohci) +__releases(ohci->lock) +__acquires(ohci->lock) { - struct ohci_hcd *ohci = hcd_to_ohci (hcd); + struct usb_hcd *hcd = ohci_to_hcd (ohci); u32 temp, enables; int status = -EINPROGRESS; - unsigned long flags; - - if (time_before (jiffies, ohci->next_statechange)) - msleep(5); - - spin_lock_irqsave (&ohci->lock, flags); - - if (unlikely(!test_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags))) { - spin_unlock_irqrestore (&ohci->lock, flags); - return -ESHUTDOWN; - } - + int autostopped = ohci->autostop; + ohci->autostop = 0; ohci->hc_control = ohci_readl (ohci, &ohci->regs->control); if (ohci->hc_control & (OHCI_CTRL_IR | OHCI_SCHED_ENABLES)) { @@ -188,7 +162,8 @@ static int ohci_bus_resume (struct usb_hcd *hcd) ohci->hc_control |= OHCI_USB_RESUME; ohci_writel (ohci, ohci->hc_control, &ohci->regs->control); (void) ohci_readl (ohci, &ohci->regs->control); - ohci_dbg (ohci, "resume root hub\n"); + ohci_dbg (ohci, "%s root hub\n", + autostopped ? "auto-start" : "resume"); break; case OHCI_USB_RESUME: /* HCFS changes sometime after INTR_RD */ @@ -203,16 +178,26 @@ static int ohci_bus_resume (struct usb_hcd *hcd) ohci_dbg (ohci, "lost power\n"); status = -EBUSY; } - spin_unlock_irqrestore (&ohci->lock, flags); +#ifdef CONFIG_PM if (status == -EBUSY) { - (void) ohci_init (ohci); - return ohci_restart (ohci); + if (!autostopped) { + static int ohci_restart (struct ohci_hcd *ohci); + + spin_unlock_irq (&ohci->lock); + (void) ohci_init (ohci); + status = ohci_restart (ohci); + spin_lock_irq (&ohci->lock); + } + return status; } +#endif if (status != -EINPROGRESS) return status; + if (autostopped) + goto skip_resume; + spin_unlock_irq (&ohci->lock); temp = ohci->num_ports; - enables = 0; while (temp--) { u32 stat = ohci_readl (ohci, &ohci->regs->roothub.portstatus [temp]); @@ -245,17 +230,21 @@ static int ohci_bus_resume (struct usb_hcd *hcd) /* Sometimes PCI D3 suspend trashes frame timings ... */ periodic_reinit (ohci); + /* the following code is executed with ohci->lock held and + * irqs disabled if and only if autostopped is true + */ + +skip_resume: /* interrupts might have been disabled */ ohci_writel (ohci, OHCI_INTR_INIT, &ohci->regs->intrenable); if (ohci->ed_rm_list) ohci_writel (ohci, OHCI_INTR_SF, &ohci->regs->intrenable); - ohci_writel (ohci, ohci_readl (ohci, &ohci->regs->intrstatus), - &ohci->regs->intrstatus); /* Then re-enable operations */ ohci_writel (ohci, OHCI_USB_OPER, &ohci->regs->control); (void) ohci_readl (ohci, &ohci->regs->control); - msleep (3); + if (!autostopped) + msleep (3); temp = ohci->hc_control; temp &= OHCI_CTRL_RWC; @@ -265,7 +254,11 @@ static int ohci_bus_resume (struct usb_hcd *hcd) (void) ohci_readl (ohci, &ohci->regs->control); /* TRSMRCY */ - msleep (10); + if (!autostopped) { + msleep (10); + spin_lock_irq (&ohci->lock); + } + /* now ohci->lock is always held and irqs are always disabled */ /* keep it alive for more than ~5x suspend + resume costs */ ohci->next_statechange = jiffies + STATECHANGE_DELAY; @@ -302,6 +295,45 @@ static int ohci_bus_resume (struct usb_hcd *hcd) return 0; } +#ifdef CONFIG_PM + +static int ohci_bus_suspend (struct usb_hcd *hcd) +{ + struct ohci_hcd *ohci = hcd_to_ohci (hcd); + int rc; + + spin_lock_irq (&ohci->lock); + + if (unlikely(!test_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags))) + rc = -ESHUTDOWN; + else + rc = ohci_rh_suspend (ohci, 0); + spin_unlock_irq (&ohci->lock); + return rc; +} + +static int ohci_bus_resume (struct usb_hcd *hcd) +{ + struct ohci_hcd *ohci = hcd_to_ohci (hcd); + int rc; + + if (time_before (jiffies, ohci->next_statechange)) + msleep(5); + + spin_lock_irq (&ohci->lock); + + if (unlikely(!test_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags))) + rc = -ESHUTDOWN; + else + rc = ohci_rh_resume (ohci); + spin_unlock_irq (&ohci->lock); + + /* poll until we know a device is connected or we autostop */ + if (rc == 0) + usb_hcd_poll_rh_status(hcd); + return rc; +} + #endif /* CONFIG_PM */ /*-------------------------------------------------------------------------*/ @@ -313,17 +345,11 @@ ohci_hub_status_data (struct usb_hcd *hcd, char *buf) { struct ohci_hcd *ohci = hcd_to_ohci (hcd); int i, changed = 0, length = 1; + int any_connected = 0, rhsc_enabled = 1; unsigned long flags; spin_lock_irqsave (&ohci->lock, flags); - /* handle autosuspended root: finish resuming before - * letting khubd or root hub timer see state changes. - */ - if (unlikely((ohci->hc_control & OHCI_CTRL_HCFS) != OHCI_USB_OPER - || !HC_IS_RUNNING(hcd->state))) - goto done; - /* undocumented erratum seen on at least rev D */ if ((ohci->flags & OHCI_QUIRK_AMD756) && (roothub_a (ohci) & RH_A_NDP) > MAX_ROOT_PORTS) { @@ -347,6 +373,9 @@ ohci_hub_status_data (struct usb_hcd *hcd, char *buf) for (i = 0; i < ohci->num_ports; i++) { u32 status = roothub_portstatus (ohci, i); + /* can't autostop if ports are connected */ + any_connected |= (status & RH_PS_CCS); + if (status & (RH_PS_CSC | RH_PS_PESC | RH_PS_PSSC | RH_PS_OCIC | RH_PS_PRSC)) { changed = 1; @@ -354,15 +383,69 @@ ohci_hub_status_data (struct usb_hcd *hcd, char *buf) buf [0] |= 1 << (i + 1); else buf [1] |= 1 << (i - 7); - continue; } } - /* after root hub changes, stop polling after debouncing - * for a while and maybe kicking in autosuspend + /* NOTE: vendors didn't always make the same implementation + * choices for RHSC. Sometimes it triggers on an edge (like + * setting and maybe clearing a port status change bit); and + * it's level-triggered on other silicon, active until khubd + * clears all active port status change bits. If it's still + * set (level-triggered) we must disable it and rely on + * polling until khubd re-enables it. */ - if (changed) - ohci->next_statechange = jiffies + STATECHANGE_DELAY; + if (ohci_readl (ohci, &ohci->regs->intrstatus) & OHCI_INTR_RHSC) { + ohci_writel (ohci, OHCI_INTR_RHSC, &ohci->regs->intrdisable); + (void) ohci_readl (ohci, &ohci->regs->intrdisable); + rhsc_enabled = 0; + } + hcd->poll_rh = 1; + + /* carry out appropriate state changes */ + switch (ohci->hc_control & OHCI_CTRL_HCFS) { + + case OHCI_USB_OPER: + /* keep on polling until we know a device is connected + * and RHSC is enabled */ + if (!ohci->autostop) { + if (any_connected) { + if (rhsc_enabled) + hcd->poll_rh = 0; + } else { + ohci->autostop = 1; + ohci->next_statechange = jiffies + HZ; + } + + /* if no devices have been attached for one second, autostop */ + } else { + if (changed || any_connected) { + ohci->autostop = 0; + ohci->next_statechange = jiffies + + STATECHANGE_DELAY; + } else if (time_after_eq (jiffies, + ohci->next_statechange) + && !ohci->ed_rm_list + && !(ohci->hc_control & + OHCI_SCHED_ENABLES)) { + ohci_rh_suspend (ohci, 1); + } + } + break; + + /* if there is a port change, autostart or ask to be resumed */ + case OHCI_USB_SUSPEND: + case OHCI_USB_RESUME: + if (changed) { + if (ohci->autostop) + ohci_rh_resume (ohci); + else + usb_hcd_resume_root_hub (hcd); + } else { + /* everything is idle, no need for polling */ + hcd->poll_rh = 0; + } + break; + } done: spin_unlock_irqrestore (&ohci->lock, flags); diff --git a/drivers/usb/host/ohci.h b/drivers/usb/host/ohci.h index 93fdc3c35341..a2f42a2f47c6 100644 --- a/drivers/usb/host/ohci.h +++ b/drivers/usb/host/ohci.h @@ -388,6 +388,7 @@ struct ohci_hcd { u32 hc_control; /* copy of hc control reg */ unsigned long next_statechange; /* suspend/resume */ u32 fminterval; /* saved register */ + unsigned autostop:1; /* rh auto stopping/stopped */ unsigned long flags; /* for HC bugs */ #define OHCI_QUIRK_AMD756 0x01 /* erratum #4 */ |