52 lines
1.8 KiB
Diff
52 lines
1.8 KiB
Diff
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From 7fdcb0738e43e49ac3081cc28212c1b7985f8bae Mon Sep 17 00:00:00 2001
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From: Hans de Goede <hdegoede@redhat.com>
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Date: Wed, 10 Oct 2012 15:50:36 +0200
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Subject: [PATCH] uhci: Raise interrupt when requested even for non active tds
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According to the spec we must raise an interrupt when one is requested
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even for non active tds.
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Linux depends on this, for bulk transfers it runs an inactivity timer
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to work around a bug in early uhci revisions, when we take longer then
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200 ms to process a packet, this timer goes of, and as part of the
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handling Linux then unlinks the qh, and relinks it after the frindex
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has increased by atleast 1, the problem is Linux only checks for the
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frindex increases on an interrupt, and we don't send that, causing
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the qh to go inactive for more then 32 frames, at which point we
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consider the packet cancelled.
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Signed-off-by: Hans de Goede <hdegoede@redhat.com>
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Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
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(cherry picked from commit 883bca776daa43111e9c39008f0038f7c62ae723)
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Signed-off-by: Michael Roth <mdroth@linux.vnet.ibm.com>
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---
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hw/usb/hcd-uhci.c | 10 +++++++++-
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1 file changed, 9 insertions(+), 1 deletion(-)
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diff --git a/hw/usb/hcd-uhci.c b/hw/usb/hcd-uhci.c
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index cdc8bc3..c2f08e3 100644
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--- a/hw/usb/hcd-uhci.c
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+++ b/hw/usb/hcd-uhci.c
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@@ -826,8 +826,16 @@ static int uhci_handle_td(UHCIState *s, uint32_t addr, UHCI_TD *td,
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USBEndpoint *ep;
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/* Is active ? */
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- if (!(td->ctrl & TD_CTRL_ACTIVE))
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+ if (!(td->ctrl & TD_CTRL_ACTIVE)) {
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+ /*
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+ * ehci11d spec page 22: "Even if the Active bit in the TD is already
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+ * cleared when the TD is fetched ... an IOC interrupt is generated"
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+ */
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+ if (td->ctrl & TD_CTRL_IOC) {
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+ *int_mask |= 0x01;
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+ }
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return TD_RESULT_NEXT_QH;
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+ }
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async = uhci_async_find_td(s, addr, td);
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if (async) {
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--
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1.8.0.2
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