Commit cc03ff9d authored by Gerd Hoffmann's avatar Gerd Hoffmann
Browse files

xhci iso: allow for some latency 



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: default avatarGerd Hoffmann <kraxel@redhat.com>
parent 786ad214

hw/usb/hcd-xhci.c

+1 −1
Original line number Diff line number Diff line
@@ -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;

        }

    }