From 7bb437f63758a301ae64ff0ef56b7d107eaa7d99 Mon Sep 17 00:00:00 2001 From: Gerd Hoffmann Date: Fri, 11 Jul 2014 14:20:58 +0200 Subject: [PATCH 24/43] xhci iso: allow for some latency Message-id: <1405088470-24115-26-git-send-email-kraxel@redhat.com> Patchwork-id: 59829 O-Subject: [RHEL-7.1 qemu-kvm PATCH 25/37] xhci iso: allow for some latency Bugzilla: 949385 RH-Acked-by: Dr. David Alan Gilbert (git) RH-Acked-by: Miroslav Rezanina RH-Acked-by: Laszlo Ersek 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 (cherry picked from commit cc03ff9d0a147a399a11c9f513afa5e06ceee453) --- hw/usb/hcd-xhci.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) Signed-off-by: Miroslav Rezanina --- hw/usb/hcd-xhci.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/hw/usb/hcd-xhci.c b/hw/usb/hcd-xhci.c index 2799539..75da33d 100644 --- a/hw/usb/hcd-xhci.c +++ b/hw/usb/hcd-xhci.c @@ -1980,7 +1980,7 @@ 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; } } -- 1.8.3.1