From 9a3bf24a77e069326ff73f7ee21bf76a6541cb73 Mon Sep 17 00:00:00 2001 From: Hans de Goede Date: Wed, 10 Oct 2012 15:50:36 +0200 Subject: [PATCH] uhci: Raise interrupt when requested even for non active tds According to the spec we must raise an interrupt when one is requested even for non active tds. Linux depends on this, for bulk transfers it runs an inactivity timer to work around a bug in early uhci revisions, when we take longer then 200 ms to process a packet, this timer goes of, and as part of the handling Linux then unlinks the qh, and relinks it after the frindex has increased by atleast 1, the problem is Linux only checks for the frindex increases on an interrupt, and we don't send that, causing the qh to go inactive for more then 32 frames, at which point we consider the packet cancelled. Signed-off-by: Hans de Goede Signed-off-by: Gerd Hoffmann (cherry picked from commit 883bca776daa43111e9c39008f0038f7c62ae723) Signed-off-by: Michael Roth --- hw/usb/hcd-uhci.c | 10 +++++++++- 1 file changed, 9 insertions(+), 1 deletion(-) diff --git a/hw/usb/hcd-uhci.c b/hw/usb/hcd-uhci.c index cdc8bc3..c2f08e3 100644 --- a/hw/usb/hcd-uhci.c +++ b/hw/usb/hcd-uhci.c @@ -826,8 +826,16 @@ static int uhci_handle_td(UHCIState *s, uint32_t addr, UHCI_TD *td, USBEndpoint *ep; /* Is active ? */ - if (!(td->ctrl & TD_CTRL_ACTIVE)) + if (!(td->ctrl & TD_CTRL_ACTIVE)) { + /* + * ehci11d spec page 22: "Even if the Active bit in the TD is already + * cleared when the TD is fetched ... an IOC interrupt is generated" + */ + if (td->ctrl & TD_CTRL_IOC) { + *int_mask |= 0x01; + } return TD_RESULT_NEXT_QH; + } async = uhci_async_find_td(s, addr, td); if (async) {