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xhci iso: allow for some latency

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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>
This commit is contained in:
Gerd Hoffmann 2014-02-06 12:06:55 +01:00
parent 786ad214c7
commit cc03ff9d0a
1 changed files with 1 additions and 1 deletions
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2
hw/usb/hcd-xhci.c
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@ -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;
}
}