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-rw-r--r--drivers/usb/host/uhci-hcd.c5
-rw-r--r--drivers/usb/host/uhci-hcd.h8
-rw-r--r--drivers/usb/host/uhci-q.c71
3 files changed, 59 insertions, 25 deletions
diff --git a/drivers/usb/host/uhci-hcd.c b/drivers/usb/host/uhci-hcd.c
index 025b969f95e8..7b48567622ef 100644
--- a/drivers/usb/host/uhci-hcd.c
+++ b/drivers/usb/host/uhci-hcd.c
@@ -497,9 +497,9 @@ static int uhci_start(struct usb_hcd *hcd)
hcd->uses_new_polling = 1;
spin_lock_init(&uhci->lock);
-
+ setup_timer(&uhci->fsbr_timer, uhci_fsbr_timeout,
+ (unsigned long) uhci);
INIT_LIST_HEAD(&uhci->idle_qh_list);
-
init_waitqueue_head(&uhci->waitqh);
if (DEBUG_CONFIGURED) {
@@ -675,6 +675,7 @@ static void uhci_stop(struct usb_hcd *hcd)
uhci_scan_schedule(uhci, NULL);
spin_unlock_irq(&uhci->lock);
+ del_timer_sync(&uhci->fsbr_timer);
release_uhci(uhci);
}
diff --git a/drivers/usb/host/uhci-hcd.h b/drivers/usb/host/uhci-hcd.h
index 619d704f4e8f..108e3de2dc26 100644
--- a/drivers/usb/host/uhci-hcd.h
+++ b/drivers/usb/host/uhci-hcd.h
@@ -86,7 +86,7 @@
/* When no queues need Full-Speed Bandwidth Reclamation,
* delay this long before turning FSBR off */
-#define FSBR_OFF_DELAY msecs_to_jiffies(400)
+#define FSBR_OFF_DELAY msecs_to_jiffies(10)
/* If a queue hasn't advanced after this much time, assume it is stuck */
#define QH_WAIT_TIMEOUT msecs_to_jiffies(200)
@@ -382,8 +382,6 @@ struct uhci_hcd {
__le32 *frame;
void **frame_cpu; /* CPU's frame list */
- unsigned long fsbr_jiffies; /* Time when FSBR was last wanted */
-
enum uhci_rh_state rh_state;
unsigned long auto_stop_time; /* When to AUTO_STOP */
@@ -400,6 +398,10 @@ struct uhci_hcd {
need to be polled */
unsigned int is_initialized:1; /* Data structure is usable */
unsigned int fsbr_is_on:1; /* FSBR is turned on */
+ unsigned int fsbr_is_wanted:1; /* Does any URB want FSBR? */
+ unsigned int fsbr_expiring:1; /* FSBR is timing out */
+
+ struct timer_list fsbr_timer; /* For turning off FBSR */
/* Support for port suspend/resume/reset */
unsigned long port_c_suspend; /* Bit-arrays of ports */
diff --git a/drivers/usb/host/uhci-q.c b/drivers/usb/host/uhci-q.c
index b173d914d748..c9d72ac0a1d7 100644
--- a/drivers/usb/host/uhci-q.c
+++ b/drivers/usb/host/uhci-q.c
@@ -64,16 +64,30 @@ static void uhci_add_fsbr(struct uhci_hcd *uhci, struct urb *urb)
urbp->fsbr = 1;
}
-static void uhci_qh_wants_fsbr(struct uhci_hcd *uhci, struct uhci_qh *qh)
+static void uhci_urbp_wants_fsbr(struct uhci_hcd *uhci, struct urb_priv *urbp)
{
- struct urb_priv *urbp =
- list_entry(qh->queue.next, struct urb_priv, node);
-
if (urbp->fsbr) {
- uhci->fsbr_jiffies = jiffies;
+ uhci->fsbr_is_wanted = 1;
if (!uhci->fsbr_is_on)
uhci_fsbr_on(uhci);
+ else if (uhci->fsbr_expiring) {
+ uhci->fsbr_expiring = 0;
+ del_timer(&uhci->fsbr_timer);
+ }
+ }
+}
+
+static void uhci_fsbr_timeout(unsigned long _uhci)
+{
+ struct uhci_hcd *uhci = (struct uhci_hcd *) _uhci;
+ unsigned long flags;
+
+ spin_lock_irqsave(&uhci->lock, flags);
+ if (uhci->fsbr_expiring) {
+ uhci->fsbr_expiring = 0;
+ uhci_fsbr_off(uhci);
}
+ spin_unlock_irqrestore(&uhci->lock, flags);
}
@@ -287,7 +301,7 @@ static int uhci_cleanup_queue(struct uhci_hcd *uhci, struct uhci_qh *qh,
if (qh->type == USB_ENDPOINT_XFER_ISOC) {
ret = (uhci->frame_number + uhci->is_stopped !=
qh->unlink_frame);
- return ret;
+ goto done;
}
/* If the URB isn't first on its queue, adjust the link pointer
@@ -304,24 +318,26 @@ static int uhci_cleanup_queue(struct uhci_hcd *uhci, struct uhci_qh *qh,
td = list_entry(urbp->td_list.prev, struct uhci_td,
list);
ptd->link = td->link;
- return ret;
+ goto done;
}
/* If the QH element pointer is UHCI_PTR_TERM then then currently
* executing URB has already been unlinked, so this one isn't it. */
if (qh_element(qh) == UHCI_PTR_TERM)
- return ret;
+ goto done;
qh->element = UHCI_PTR_TERM;
/* Control pipes have to worry about toggles */
if (qh->type == USB_ENDPOINT_XFER_CONTROL)
- return ret;
+ goto done;
/* Save the next toggle value */
WARN_ON(list_empty(&urbp->td_list));
td = list_entry(urbp->td_list.next, struct uhci_td, list);
qh->needs_fixup = 1;
qh->initial_toggle = uhci_toggle(td_token(td));
+
+done:
return ret;
}
@@ -1175,7 +1191,7 @@ static int uhci_urb_enqueue(struct usb_hcd *hcd,
* queue isn't stopped. */
if (qh->queue.next == &urbp->node && !qh->is_stopped) {
uhci_activate_qh(uhci, qh);
- uhci_qh_wants_fsbr(uhci, qh);
+ uhci_urbp_wants_fsbr(uhci, urbp);
}
goto done;
@@ -1404,7 +1420,7 @@ static int uhci_advance_check(struct uhci_hcd *uhci, struct uhci_qh *qh)
unsigned status;
if (qh->type == USB_ENDPOINT_XFER_ISOC)
- return ret;
+ goto done;
/* Treat an UNLINKING queue as though it hasn't advanced.
* This is okay because reactivation will treat it as though
@@ -1427,21 +1443,24 @@ static int uhci_advance_check(struct uhci_hcd *uhci, struct uhci_qh *qh)
/* We're okay, the queue has advanced */
qh->wait_expired = 0;
qh->advance_jiffies = jiffies;
- return ret;
+ goto done;
}
ret = 0;
}
/* The queue hasn't advanced; check for timeout */
- if (!qh->wait_expired && time_after(jiffies,
- qh->advance_jiffies + QH_WAIT_TIMEOUT)) {
+ if (qh->wait_expired)
+ goto done;
+
+ if (time_after(jiffies, qh->advance_jiffies + QH_WAIT_TIMEOUT)) {
/* Detect the Intel bug and work around it */
if (qh->post_td && qh_element(qh) ==
cpu_to_le32(qh->post_td->dma_handle)) {
qh->element = qh->post_td->link;
qh->advance_jiffies = jiffies;
- return 1;
+ ret = 1;
+ goto done;
}
qh->wait_expired = 1;
@@ -1452,7 +1471,14 @@ static int uhci_advance_check(struct uhci_hcd *uhci, struct uhci_qh *qh)
* starts moving again. */
if (urbp && urbp->fsbr && !(status & TD_CTRL_IOC))
uhci_unlink_qh(uhci, qh);
+
+ } else {
+ /* Unmoving but not-yet-expired queues keep FSBR alive */
+ if (urbp)
+ uhci_urbp_wants_fsbr(uhci, urbp);
}
+
+done:
return ret;
}
@@ -1472,6 +1498,7 @@ static void uhci_scan_schedule(struct uhci_hcd *uhci, struct pt_regs *regs)
uhci->scan_in_progress = 1;
rescan:
uhci->need_rescan = 0;
+ uhci->fsbr_is_wanted = 0;
uhci_clear_next_interrupt(uhci);
uhci_get_current_frame_number(uhci);
@@ -1487,8 +1514,10 @@ rescan:
if (uhci_advance_check(uhci, qh)) {
uhci_scan_qh(uhci, qh, regs);
- if (qh->state == QH_STATE_ACTIVE)
- uhci_qh_wants_fsbr(uhci, qh);
+ if (qh->state == QH_STATE_ACTIVE) {
+ uhci_urbp_wants_fsbr(uhci,
+ list_entry(qh->queue.next, struct urb_priv, node));
+ }
}
}
}
@@ -1498,9 +1527,11 @@ rescan:
goto rescan;
uhci->scan_in_progress = 0;
- if (uhci->fsbr_is_on && time_after(jiffies,
- uhci->fsbr_jiffies + FSBR_OFF_DELAY))
- uhci_fsbr_off(uhci);
+ if (uhci->fsbr_is_on && !uhci->fsbr_is_wanted &&
+ !uhci->fsbr_expiring) {
+ uhci->fsbr_expiring = 1;
+ mod_timer(&uhci->fsbr_timer, jiffies + FSBR_OFF_DELAY);
+ }
if (list_empty(&uhci->skel_unlink_qh->node))
uhci_clear_next_interrupt(uhci);
Copyright © 1996 – 2023 Jason A. Donenfeld. All Rights Reverse Engineered.