Message ID | 1391686923-11688-2-git-send-email-kraxel@redhat.com |
---|---|
State | New |
Headers | show |
diff --git a/hw/usb/hcd-xhci.c b/hw/usb/hcd-xhci.c index 2c54b86..6188e77 100644 --- a/hw/usb/hcd-xhci.c +++ b/hw/usb/hcd-xhci.c @@ -1977,7 +1977,7 @@ static void xhci_calc_iso_kick(XHCIState *xhci, XHCITransfer *xfer, xfer->mfindex_kick = ((xfer->trbs[0].control >> TRB_TR_FRAMEID_SHIFT) & TRB_TR_FRAMEID_MASK) << 3; xfer->mfindex_kick |= mfindex & ~0x3fff; - if (xfer->mfindex_kick < mfindex) { + if (xfer->mfindex_kick + 0x100 < mfindex) { xfer->mfindex_kick += 0x4000; } }
Allow the scheduled transfer time be a bit behind, to compensate for latencies. Without this xhci will wait way to often for the mfindex wraparound, assuming the scheduled time is in the future just because qemu is a bit behind in processing the iso transfer requests. Signed-off-by: Gerd Hoffmann <kraxel@redhat.com> --- hw/usb/hcd-xhci.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)