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From 7bb437f63758a301ae64ff0ef56b7d107eaa7d99 Mon Sep 17 00:00:00 2001
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From: Gerd Hoffmann <kraxel@redhat.com>
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Date: Fri, 11 Jul 2014 14:20:58 +0200
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Subject: [PATCH 24/43] xhci iso: allow for some latency
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Message-id: <1405088470-24115-26-git-send-email-kraxel@redhat.com>
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Patchwork-id: 59829
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O-Subject: [RHEL-7.1 qemu-kvm PATCH 25/37] xhci iso: allow for some latency
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Bugzilla: 949385
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RH-Acked-by: Dr. David Alan Gilbert (git) <dgilbert@redhat.com>
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RH-Acked-by: Miroslav Rezanina <mrezanin@redhat.com>
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RH-Acked-by: Laszlo Ersek <lersek@redhat.com>
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Allow the scheduled transfer time be a bit behind, to
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compensate for latencies. Without this xhci will wait
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way to often for the mfindex wraparound, assuming the
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scheduled time is in the future just because qemu is
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a bit behind in processing the iso transfer requests.
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Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
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(cherry picked from commit cc03ff9d0a147a399a11c9f513afa5e06ceee453)
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---
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hw/usb/hcd-xhci.c | 2 +-
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1 file changed, 1 insertion(+), 1 deletion(-)
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Signed-off-by: Miroslav Rezanina <mrezanin@redhat.com>
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---
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hw/usb/hcd-xhci.c | 2 +-
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1 file changed, 1 insertion(+), 1 deletion(-)
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diff --git a/hw/usb/hcd-xhci.c b/hw/usb/hcd-xhci.c
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index 2799539..75da33d 100644
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--- a/hw/usb/hcd-xhci.c
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+++ b/hw/usb/hcd-xhci.c
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@@ -1980,7 +1980,7 @@ static void xhci_calc_iso_kick(XHCIState *xhci, XHCITransfer *xfer,
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xfer->mfindex_kick = ((xfer->trbs[0].control >> TRB_TR_FRAMEID_SHIFT)
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& TRB_TR_FRAMEID_MASK) << 3;
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xfer->mfindex_kick |= mfindex & ~0x3fff;
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- if (xfer->mfindex_kick < mfindex) {
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+ if (xfer->mfindex_kick + 0x100 < mfindex) {
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xfer->mfindex_kick += 0x4000;
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}
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}
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--
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1.8.3.1
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