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From 41f5d67c0649d74b505edc2a874c91148355eb25 Mon Sep 17 00:00:00 2001
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From: Hans de Goede <hdegoede@redhat.com>
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Date: Wed, 12 Sep 2012 13:30:51 +0200
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Subject: [PATCH 368/369] uhci: Don't queue up packets after one with the SPD
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flag set
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Don't queue up packets after a packet with the SPD (short packet detect)
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flag set. Since we won't know if the packet will actually be short until it
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has completed, and if it is short we should stop the queue.
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This fixes a miniature photoframe emulating a USB cdrom with the windows
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software for it not working.
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Signed-off-by: Hans de Goede <hdegoede@redhat.com>
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---
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hw/usb/hcd-uhci.c | 5 ++++-
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1 file changed, 4 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 c7c8786..cdc8bc3 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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@@ -1000,6 +1000,9 @@ static void uhci_fill_queue(UHCIState *s, UHCI_TD *td)
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}
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assert(ret == TD_RESULT_ASYNC_START);
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assert(int_mask == 0);
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+ if (ptd.ctrl & TD_CTRL_SPD) {
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+ break;
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+ }
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plink = ptd.link;
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}
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}
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@@ -1097,7 +1100,7 @@ static void uhci_process_frame(UHCIState *s)
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case TD_RESULT_ASYNC_START:
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trace_usb_uhci_td_async(curr_qh & ~0xf, link & ~0xf);
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- if (is_valid(td.link)) {
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+ if (is_valid(td.link) && !(td.ctrl & TD_CTRL_SPD)) {
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uhci_fill_queue(s, &td);
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}
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link = curr_qh ? qh.link : td.link;
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--
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1.7.12
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