diff options
Diffstat (limited to 'drivers/usb/host/ehci-q.c')
| -rw-r--r-- | drivers/usb/host/ehci-q.c | 27 |
1 files changed, 22 insertions, 5 deletions
diff --git a/drivers/usb/host/ehci-q.c b/drivers/usb/host/ehci-q.c index 7673554fa64d..1ae9faf1f8c2 100644 --- a/drivers/usb/host/ehci-q.c +++ b/drivers/usb/host/ehci-q.c @@ -475,8 +475,20 @@ halt: * we must clear the TT buffer (11.17.5). */ if (unlikely(last_status != -EINPROGRESS && - last_status != -EREMOTEIO)) - ehci_clear_tt_buffer(ehci, qh, urb, token); + last_status != -EREMOTEIO)) { + /* The TT's in some hubs malfunction when they + * receive this request following a STALL (they + * stop sending isochronous packets). Since a + * STALL can't leave the TT buffer in a busy + * state (if you believe Figures 11-48 - 11-51 + * in the USB 2.0 spec), we won't clear the TT + * buffer in this case. Strictly speaking this + * is a violation of the spec. + */ + if (last_status != -EPIPE) + ehci_clear_tt_buffer(ehci, qh, urb, + token); + } } /* if we're removing something not at the queue head, @@ -790,9 +802,10 @@ qh_make ( * But interval 1 scheduling is simpler, and * includes high bandwidth. */ - dbg ("intr period %d uframes, NYET!", - urb->interval); - goto done; + urb->interval = 1; + } else if (qh->period > ehci->periodic_size) { + qh->period = ehci->periodic_size; + urb->interval = qh->period << 3; } } else { int think_time; @@ -815,6 +828,10 @@ qh_make ( usb_calc_bus_time (urb->dev->speed, is_input, 0, max_packet (maxp))); qh->period = urb->interval; + if (qh->period > ehci->periodic_size) { + qh->period = ehci->periodic_size; + urb->interval = qh->period; + } } } |