diff options
Diffstat (limited to 'drivers/usb/host')
| -rw-r--r-- | drivers/usb/host/ehci-hcd.c | 35 | ||||
| -rw-r--r-- | drivers/usb/host/ehci-hub.c | 3 | ||||
| -rw-r--r-- | drivers/usb/host/ehci-q.c | 149 | ||||
| -rw-r--r-- | drivers/usb/host/ehci-timer.c | 3 | ||||
| -rw-r--r-- | drivers/usb/host/ehci.h | 2 |
5 files changed, 98 insertions, 94 deletions
diff --git a/drivers/usb/host/ehci-hcd.c b/drivers/usb/host/ehci-hcd.c index f74ba277c22d..86e8ee169c67 100644 --- a/drivers/usb/host/ehci-hcd.c +++ b/drivers/usb/host/ehci-hcd.c @@ -795,7 +795,7 @@ static irqreturn_t ehci_irq (struct usb_hcd *hcd) /* guard against (alleged) silicon errata */ if (cmd & CMD_IAAD) ehci_dbg(ehci, "IAA with IAAD still set?\n"); - if (ehci->async_unlink) { + if (ehci->async_iaa) { COUNT(ehci->stats.iaa); end_unlink_async(ehci); } else @@ -926,33 +926,6 @@ static int ehci_urb_enqueue ( } } -static void unlink_async (struct ehci_hcd *ehci, struct ehci_qh *qh) -{ - /* failfast */ - if (ehci->rh_state < EHCI_RH_RUNNING && ehci->async_unlink) - end_unlink_async(ehci); - - /* If the QH isn't linked then there's nothing we can do - * unless we were called during a giveback, in which case - * qh_completions() has to deal with it. - */ - if (qh->qh_state != QH_STATE_LINKED) { - if (qh->qh_state == QH_STATE_COMPLETING) - qh->needs_rescan = 1; - return; - } - - /* defer till later if busy */ - if (ehci->async_unlink) { - qh->qh_state = QH_STATE_UNLINK_WAIT; - ehci->async_unlink_last->unlink_next = qh; - ehci->async_unlink_last = qh; - - /* start IAA cycle */ - } else - start_unlink_async (ehci, qh); -} - /* remove from hardware lists * completions normally happen asynchronously */ @@ -979,7 +952,7 @@ static int ehci_urb_dequeue(struct usb_hcd *hcd, struct urb *urb, int status) switch (qh->qh_state) { case QH_STATE_LINKED: case QH_STATE_COMPLETING: - unlink_async(ehci, qh); + start_unlink_async(ehci, qh); break; case QH_STATE_UNLINK: case QH_STATE_UNLINK_WAIT: @@ -1070,7 +1043,7 @@ rescan: * may already be unlinked. */ if (tmp) - unlink_async(ehci, qh); + start_unlink_async(ehci, qh); /* FALL THROUGH */ case QH_STATE_UNLINK: /* wait for hw to finish? */ case QH_STATE_UNLINK_WAIT: @@ -1133,7 +1106,7 @@ ehci_endpoint_reset(struct usb_hcd *hcd, struct usb_host_endpoint *ep) * re-linking will call qh_refresh(). */ if (eptype == USB_ENDPOINT_XFER_BULK) - unlink_async(ehci, qh); + start_unlink_async(ehci, qh); else start_unlink_intr(ehci, qh); } diff --git a/drivers/usb/host/ehci-hub.c b/drivers/usb/host/ehci-hub.c index 3097872b1e74..a3822700e496 100644 --- a/drivers/usb/host/ehci-hub.c +++ b/drivers/usb/host/ehci-hub.c @@ -299,8 +299,7 @@ static int ehci_bus_suspend (struct usb_hcd *hcd) ehci_halt (ehci); ehci->rh_state = EHCI_RH_SUSPENDED; - if (ehci->async_unlink) - end_unlink_async(ehci); + end_unlink_async(ehci); ehci_handle_intr_unlinks(ehci); end_free_itds(ehci); diff --git a/drivers/usb/host/ehci-q.c b/drivers/usb/host/ehci-q.c index 7b35933d91a6..181832921c53 100644 --- a/drivers/usb/host/ehci-q.c +++ b/drivers/usb/host/ehci-q.c @@ -293,9 +293,6 @@ __acquires(ehci->lock) spin_lock (&ehci->lock); } -static void start_unlink_async (struct ehci_hcd *ehci, struct ehci_qh *qh); -static void unlink_async (struct ehci_hcd *ehci, struct ehci_qh *qh); - static int qh_schedule (struct ehci_hcd *ehci, struct ehci_qh *qh); /* @@ -1166,82 +1163,114 @@ submit_async ( /*-------------------------------------------------------------------------*/ -/* the async qh for the qtds being unlinked are now gone from the HC */ - -static void end_unlink_async (struct ehci_hcd *ehci) +static void single_unlink_async(struct ehci_hcd *ehci, struct ehci_qh *qh) { - struct ehci_qh *qh = ehci->async_unlink; - struct ehci_qh *next; + struct ehci_qh *prev; - // qh->hw_next = cpu_to_hc32(qh->qh_dma); - qh->qh_state = QH_STATE_IDLE; - qh->qh_next.qh = NULL; + /* Add to the end of the list of QHs waiting for the next IAAD */ + qh->qh_state = QH_STATE_UNLINK; + if (ehci->async_unlink) + ehci->async_unlink_last->unlink_next = qh; + else + ehci->async_unlink = qh; + ehci->async_unlink_last = qh; + + /* Unlink it from the schedule */ + prev = ehci->async; + while (prev->qh_next.qh != qh) + prev = prev->qh_next.qh; + + prev->hw->hw_next = qh->hw->hw_next; + prev->qh_next = qh->qh_next; + if (ehci->qh_scan_next == qh) + ehci->qh_scan_next = qh->qh_next.qh; +} - /* other unlink(s) may be pending (in QH_STATE_UNLINK_WAIT) */ - next = qh->unlink_next; - ehci->async_unlink = next; - qh->unlink_next = NULL; +static void start_iaa_cycle(struct ehci_hcd *ehci, bool nested) +{ + /* + * Do nothing if an IAA cycle is already running or + * if one will be started shortly. + */ + if (ehci->async_iaa || ehci->async_unlinking) + return; - qh_completions (ehci, qh); + /* Do all the waiting QHs at once */ + ehci->async_iaa = ehci->async_unlink; + ehci->async_unlink = NULL; - if (!list_empty(&qh->qtd_list) && ehci->rh_state == EHCI_RH_RUNNING) - qh_link_async (ehci, qh); + /* If the controller isn't running, we don't have to wait for it */ + if (unlikely(ehci->rh_state < EHCI_RH_RUNNING)) { + if (!nested) /* Avoid recursion */ + end_unlink_async(ehci); - disable_async(ehci); + /* Otherwise start a new IAA cycle */ + } else { + /* Make sure the unlinks are all visible to the hardware */ + wmb(); - if (next) { - ehci->async_unlink = NULL; - start_unlink_async (ehci, next); + ehci_writel(ehci, ehci->command | CMD_IAAD, + &ehci->regs->command); + ehci_readl(ehci, &ehci->regs->command); + ehci_enable_event(ehci, EHCI_HRTIMER_IAA_WATCHDOG, true); } +} + +/* the async qh for the qtds being unlinked are now gone from the HC */ + +static void end_unlink_async(struct ehci_hcd *ehci) +{ + struct ehci_qh *qh; if (ehci->has_synopsys_hc_bug) ehci_writel(ehci, (u32) ehci->async->qh_dma, &ehci->regs->async_next); + + /* Process the idle QHs */ + restart: + ehci->async_unlinking = true; + while (ehci->async_iaa) { + qh = ehci->async_iaa; + ehci->async_iaa = qh->unlink_next; + qh->unlink_next = NULL; + + qh->qh_state = QH_STATE_IDLE; + qh->qh_next.qh = NULL; + + qh_completions(ehci, qh); + if (!list_empty(&qh->qtd_list) && + ehci->rh_state == EHCI_RH_RUNNING) + qh_link_async(ehci, qh); + disable_async(ehci); + } + ehci->async_unlinking = false; + + /* Start a new IAA cycle if any QHs are waiting for it */ + if (ehci->async_unlink) { + start_iaa_cycle(ehci, true); + if (unlikely(ehci->rh_state < EHCI_RH_RUNNING)) + goto restart; + } } /* makes sure the async qh will become idle */ /* caller must own ehci->lock */ -static void start_unlink_async (struct ehci_hcd *ehci, struct ehci_qh *qh) +static void start_unlink_async(struct ehci_hcd *ehci, struct ehci_qh *qh) { - struct ehci_qh *prev; - -#ifdef DEBUG - assert_spin_locked(&ehci->lock); - if (ehci->async_unlink - || (qh->qh_state != QH_STATE_LINKED - && qh->qh_state != QH_STATE_UNLINK_WAIT) - ) - BUG (); -#endif - - qh->qh_state = QH_STATE_UNLINK; - ehci->async_unlink = qh; - if (!qh->unlink_next) - ehci->async_unlink_last = qh; - - prev = ehci->async; - while (prev->qh_next.qh != qh) - prev = prev->qh_next.qh; - - prev->hw->hw_next = qh->hw->hw_next; - prev->qh_next = qh->qh_next; - if (ehci->qh_scan_next == qh) - ehci->qh_scan_next = qh->qh_next.qh; - wmb (); - - /* If the controller isn't running, we don't have to wait for it */ - if (unlikely(ehci->rh_state < EHCI_RH_RUNNING)) { - /* if (unlikely (qh->unlink_next != 0)) - * this will recurse, probably not much - */ - end_unlink_async (ehci); + /* + * If the QH isn't linked then there's nothing we can do + * unless we were called during a giveback, in which case + * qh_completions() has to deal with it. + */ + if (qh->qh_state != QH_STATE_LINKED) { + if (qh->qh_state == QH_STATE_COMPLETING) + qh->needs_rescan = 1; return; } - ehci_writel(ehci, ehci->command | CMD_IAAD, &ehci->regs->command); - (void)ehci_readl(ehci, &ehci->regs->command); - ehci_enable_event(ehci, EHCI_HRTIMER_IAA_WATCHDOG, true); + single_unlink_async(ehci, qh); + start_iaa_cycle(ehci, false); } /*-------------------------------------------------------------------------*/ @@ -1269,11 +1298,11 @@ static void scan_async (struct ehci_hcd *ehci) * drops the lock. That's why ehci->qh_scan_next * always holds the next qh to scan; if the next qh * gets unlinked then ehci->qh_scan_next is adjusted - * in start_unlink_async(). + * in single_unlink_async(). */ temp = qh_completions(ehci, qh); if (qh->needs_rescan) - unlink_async(ehci, qh); + start_unlink_async(ehci, qh); qh->unlink_time = jiffies + EHCI_SHRINK_JIFFIES; if (temp != 0) goto rescan; diff --git a/drivers/usb/host/ehci-timer.c b/drivers/usb/host/ehci-timer.c index aab042064226..8ca5f152f5bd 100644 --- a/drivers/usb/host/ehci-timer.c +++ b/drivers/usb/host/ehci-timer.c @@ -211,6 +211,7 @@ static void ehci_handle_controller_death(struct ehci_hcd *ehci) ehci_writel(ehci, 0, &ehci->regs->configured_flag); ehci_writel(ehci, 0, &ehci->regs->intr_enable); ehci_work(ehci); + end_unlink_async(ehci); /* Not in process context, so don't try to reset the controller */ } @@ -304,7 +305,7 @@ static void ehci_iaa_watchdog(struct ehci_hcd *ehci) * (a) SMP races against real IAA firing and retriggering, and * (b) clean HC shutdown, when IAA watchdog was pending. */ - if (ehci->async_unlink) { + if (ehci->async_iaa) { u32 cmd, status; /* If we get here, IAA is *REALLY* late. It's barely diff --git a/drivers/usb/host/ehci.h b/drivers/usb/host/ehci.h index d9414aae610f..1a782775881b 100644 --- a/drivers/usb/host/ehci.h +++ b/drivers/usb/host/ehci.h @@ -114,12 +114,14 @@ struct ehci_hcd { /* one per controller */ /* general schedule support */ unsigned scanning:1; bool intr_unlinking:1; + bool async_unlinking:1; /* async schedule support */ struct ehci_qh *async; struct ehci_qh *dummy; /* For AMD quirk use */ struct ehci_qh *async_unlink; struct ehci_qh *async_unlink_last; + struct ehci_qh *async_iaa; struct ehci_qh *qh_scan_next; unsigned async_count; /* async activity count */ |