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USB: EHCI: update toggle state for linked QHs 

This patch (as1245) fixes a bug in ehci-hcd.  When an URB is queued
for an endpoint whose QH is already in the LINKED state, the QH
doesn't get refreshed.  As a result, if usb_clear_halt() was called
during the time that the QH was linked but idle, the data toggle value
in the QH doesn't get reset.

The symptom is that after a clear_halt, data gets lost and transfers
time out.  This problem is starting to show up now because the
"ehci-hcd unlink speedups" patch causes QHs with no queued URBs to
remain linked for a suitable time.

The patch utilizes the new endpoint_reset mechanism to fix the
problem.  When an endpoint is reset, the new method forcibly unlinks
the QH (if necessary) and safely updates the toggle value.  This
allows qh_update() to be simplified and avoids using usb_device's
toggle bits in a rather unintuitive way.

Signed-off-by: Alan Stern <stern@rowland.harvard.edu>
CC: David Brownell <david-b@pacbell.net>
Tested-by: David <david@unsolicited.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Alan Stern 2009-05-27 18:21:56 -04:00 committed by Greg Kroah-Hartman
parent 5effabbe9e
commit b18ffd49e8
9 changed files with 53 additions and 18 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
drivers/usb/host/ehci-au1xxx.c
View File

@ -97,6 +97,7 @@ static const struct hc_driver ehci_au1xxx_hc_driver = {
.urb_enqueue = ehci_urb_enqueue,
.urb_dequeue = ehci_urb_dequeue,
.endpoint_disable = ehci_endpoint_disable,
.endpoint_reset = ehci_endpoint_reset,
/*
* scheduling support

1
drivers/usb/host/ehci-fsl.c
View File

@ -309,6 +309,7 @@ static const struct hc_driver ehci_fsl_hc_driver = {
.urb_enqueue = ehci_urb_enqueue,
.urb_dequeue = ehci_urb_dequeue,
.endpoint_disable = ehci_endpoint_disable,
.endpoint_reset = ehci_endpoint_reset,
/*
* scheduling support

45
drivers/usb/host/ehci-hcd.c
View File

@ -1024,6 +1024,51 @@ done:
return;
}
static void
ehci_endpoint_reset(struct usb_hcd *hcd, struct usb_host_endpoint *ep)
{
struct ehci_hcd *ehci = hcd_to_ehci(hcd);
struct ehci_qh *qh;
int eptype = usb_endpoint_type(&ep->desc);
if (eptype != USB_ENDPOINT_XFER_BULK && eptype != USB_ENDPOINT_XFER_INT)
return;
rescan:
spin_lock_irq(&ehci->lock);
qh = ep->hcpriv;
/* For Bulk and Interrupt endpoints we maintain the toggle state
* in the hardware; the toggle bits in udev aren't used at all.
* When an endpoint is reset by usb_clear_halt() we must reset
* the toggle bit in the QH.
*/
if (qh) {
if (!list_empty(&qh->qtd_list)) {
WARN_ONCE(1, "clear_halt for a busy endpoint\n");
} else if (qh->qh_state == QH_STATE_IDLE) {
qh->hw_token &= ~cpu_to_hc32(ehci, QTD_TOGGLE);
} else {
/* It's not safe to write into the overlay area
* while the QH is active. Unlink it first and
* wait for the unlink to complete.
*/
if (qh->qh_state == QH_STATE_LINKED) {
if (eptype == USB_ENDPOINT_XFER_BULK) {
unlink_async(ehci, qh);
} else {
intr_deschedule(ehci, qh);
(void) qh_schedule(ehci, qh);
}
}
spin_unlock_irq(&ehci->lock);
schedule_timeout_uninterruptible(1);
goto rescan;
}
}
spin_unlock_irq(&ehci->lock);
}
static int ehci_get_frame (struct usb_hcd *hcd)
{
struct ehci_hcd *ehci = hcd_to_ehci (hcd);

1
drivers/usb/host/ehci-ixp4xx.c
View File

@ -51,6 +51,7 @@ static const struct hc_driver ixp4xx_ehci_hc_driver = {
.urb_enqueue = ehci_urb_enqueue,
.urb_dequeue = ehci_urb_dequeue,
.endpoint_disable = ehci_endpoint_disable,
.endpoint_reset = ehci_endpoint_reset,
.get_frame_number = ehci_get_frame,
.hub_status_data = ehci_hub_status_data,
.hub_control = ehci_hub_control,

1
drivers/usb/host/ehci-orion.c
View File

@ -149,6 +149,7 @@ static const struct hc_driver ehci_orion_hc_driver = {
.urb_enqueue = ehci_urb_enqueue,
.urb_dequeue = ehci_urb_dequeue,
.endpoint_disable = ehci_endpoint_disable,
.endpoint_reset = ehci_endpoint_reset,
/*
* scheduling support

1
drivers/usb/host/ehci-pci.c
View File

@ -388,6 +388,7 @@ static const struct hc_driver ehci_pci_hc_driver = {
.urb_enqueue = ehci_urb_enqueue,
.urb_dequeue = ehci_urb_dequeue,
.endpoint_disable = ehci_endpoint_disable,
.endpoint_reset = ehci_endpoint_reset,
/*
* scheduling support

1
drivers/usb/host/ehci-ppc-of.c
View File

@ -61,6 +61,7 @@ static const struct hc_driver ehci_ppc_of_hc_driver = {
.urb_enqueue = ehci_urb_enqueue,
.urb_dequeue = ehci_urb_dequeue,
.endpoint_disable = ehci_endpoint_disable,
.endpoint_reset = ehci_endpoint_reset,
/*
* scheduling support

1
drivers/usb/host/ehci-ps3.c
View File

@ -65,6 +65,7 @@ static const struct hc_driver ps3_ehci_hc_driver = {
.urb_enqueue = ehci_urb_enqueue,
.urb_dequeue = ehci_urb_dequeue,
.endpoint_disable = ehci_endpoint_disable,
.endpoint_reset = ehci_endpoint_reset,
.get_frame_number = ehci_get_frame,
.hub_status_data = ehci_hub_status_data,
.hub_control = ehci_hub_control,

19
drivers/usb/host/ehci-q.c
View File

@ -93,22 +93,6 @@ qh_update (struct ehci_hcd *ehci, struct ehci_qh *qh, struct ehci_qtd *qtd)
qh->hw_qtd_next = QTD_NEXT(ehci, qtd->qtd_dma);
qh->hw_alt_next = EHCI_LIST_END(ehci);
/* Except for control endpoints, we make hardware maintain data
* toggle (like OHCI) ... here (re)initialize the toggle in the QH,
* and set the pseudo-toggle in udev. Only usb_clear_halt() will
* ever clear it.
*/
if (!(qh->hw_info1 & cpu_to_hc32(ehci, 1 << 14))) {
unsigned is_out, epnum;
is_out = !(qtd->hw_token & cpu_to_hc32(ehci, 1 << 8));
epnum = (hc32_to_cpup(ehci, &qh->hw_info1) >> 8) & 0x0f;
if (unlikely (!usb_gettoggle (qh->dev, epnum, is_out))) {
qh->hw_token &= ~cpu_to_hc32(ehci, QTD_TOGGLE);
usb_settoggle (qh->dev, epnum, is_out, 1);
}
}
/* HC must see latest qtd and qh data before we clear ACTIVE+HALT */
wmb ();
qh->hw_token &= cpu_to_hc32(ehci, QTD_TOGGLE | QTD_STS_PING);
@ -850,7 +834,6 @@ done:
qh->qh_state = QH_STATE_IDLE;
qh->hw_info1 = cpu_to_hc32(ehci, info1);
qh->hw_info2 = cpu_to_hc32(ehci, info2);
usb_settoggle (urb->dev, usb_pipeendpoint (urb->pipe), !is_input, 1);
qh_refresh (ehci, qh);
return qh;
}
@ -881,7 +864,7 @@ static void qh_link_async (struct ehci_hcd *ehci, struct ehci_qh *qh)
}
}
/* clear halt and/or toggle; and maybe recover from silicon quirk */
/* clear halt and maybe recover from silicon quirk */
if (qh->qh_state == QH_STATE_IDLE)
qh_refresh (ehci, qh);