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OHCI: implement new semantics for URB_ISO_ASAP

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This patch (as1614) updates the isochronous scheduling in ohci-hcd to
match the new semantics for URB_ISO_ASAP.  Testing revealed a hardware
bug in the way my OHCI controller handles expired isochronous TDs;
consequently the patch tries hard to avoid creating them (unlike the
ehci-hcd and uhci-hcd drivers).

Signed-off-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Alan Stern
2012-10-01 10:32:15 -04:00
committed by Greg Kroah-Hartman
parent c44b225077
commit 6a41b4d3fe
2 changed files with 36 additions and 8 deletions
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4
drivers/usb/host/ohci-q.c
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@@ -596,7 +596,6 @@ static void td_submit_urb (
urb_priv->ed->hwHeadP &= ~cpu_to_hc32 (ohci, ED_C);
}
urb_priv->td_cnt = 0;
list_add (&urb_priv->pending, &ohci->pending);
if (data_len)
@@ -672,7 +671,8 @@ static void td_submit_urb (
* we could often reduce the number of TDs here.
*/
case PIPE_ISOCHRONOUS:
for (cnt = 0; cnt < urb->number_of_packets; cnt++) {
for (cnt = urb_priv->td_cnt; cnt < urb->number_of_packets;
cnt++) {
int frame = urb->start_frame;
// FIXME scheduling should handle frame counter