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USB: EHCI: remove PCI assumption 

This patch (as1405) fixes a small bug in ehci-hcd's isochronous
scheduler.  Not all EHCI controllers are PCI, and the code shouldn't
assume that they are.  Instead, introduce a special flag for
controllers which need to delay iso scheduling for full-speed devices
beyond the scheduling threshold.

Signed-off-by: Alan Stern <stern@rowland.harvard.edu>
CC: Sarah Sharp <sarah.a.sharp@linux.intel.com>
CC: David Brownell <david-b@pacbell.net>
CC: stable <stable@kernel.org>
Acked-by: Sarah Sharp <sarah.a.sharp@linux.intel.com>
This commit is contained in:
Alan Stern 2010-07-14 11:03:23 -04:00 committed by Greg Kroah-Hartman
parent 43b86af83d
commit ae68a83bdc
3 changed files with 6 additions and 6 deletions
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1
drivers/usb/host/ehci-pci.c
View File

@ -114,6 +114,7 @@ static int ehci_pci_setup(struct usb_hcd *hcd)
break;
case PCI_VENDOR_ID_INTEL:
ehci->need_io_watchdog = 0;
ehci->fs_i_thresh = 1;
if (pdev->device == 0x27cc) {
ehci->broken_periodic = 1;
ehci_info(ehci, "using broken periodic workaround\n");

10
drivers/usb/host/ehci-sched.c
View File

@ -1399,7 +1399,6 @@ iso_stream_schedule (
int status;
unsigned mod = ehci->periodic_size << 3;
struct ehci_iso_sched *sched = urb->hcpriv;
struct pci_dev *pdev;
if (sched->span > (mod - SCHEDULE_SLOP)) {
ehci_dbg (ehci, "iso request %p too long\n", urb);
@ -1426,15 +1425,14 @@ iso_stream_schedule (
* slot in the schedule, implicitly assuming URB_ISO_ASAP.
*/
if (likely (!list_empty (&stream->td_list))) {
pdev = to_pci_dev(ehci_to_hcd(ehci)->self.controller);
start = stream->next_uframe;
/* For high speed devices, allow scheduling within the
* isochronous scheduling threshold. For full speed devices,
* don't. (Work around for Intel ICH9 bug.)
* isochronous scheduling threshold. For full speed devices
* and Intel PCI-based controllers, don't (work around for
* Intel ICH9 bug).
*/
if (!stream->highspeed &&
pdev->vendor == PCI_VENDOR_ID_INTEL)
if (!stream->highspeed && ehci->fs_i_thresh)
next = now + ehci->i_thresh;
else
next = now;

1
drivers/usb/host/ehci.h
View File

@ -130,6 +130,7 @@ struct ehci_hcd { /* one per controller */
unsigned has_amcc_usb23:1;
unsigned need_io_watchdog:1;
unsigned broken_periodic:1;
unsigned fs_i_thresh:1; /* Intel iso scheduling */
/* required for usb32 quirk */
#define OHCI_CTRL_HCFS (3 << 6)