Author: hselasky
Date: Mon Dec 16 10:50:13 2013
New Revision: 259462
URL: http://svnweb.freebsd.org/changeset/base/259462
Log:
Fix regression issue after r259248:
Some Intel XHCI controlles timeout processing so-called "TRBs" when
the final LINK TRB of a so-called "TD" has the CHAIN-BIT set.
MFC after: 1 week
Tested by: glebius @
Modified:
head/sys/dev/usb/controller/xhci.c
Modified: head/sys/dev/usb/controller/xhci.c
==============================================================================
--- head/sys/dev/usb/controller/xhci.c Mon Dec 16 09:48:08 2013
(r259461)
+++ head/sys/dev/usb/controller/xhci.c Mon Dec 16 10:50:13 2013
(r259462)
@@ -1942,6 +1942,8 @@ restart:
/* remove chain bit because this is the last data TRB in the chain */
td->td_trb[td->ntrb - 1].dwTrb2 &= ~htole32(XHCI_TRB_2_TDSZ_SET(15));
td->td_trb[td->ntrb - 1].dwTrb3 &= ~htole32(XHCI_TRB_3_CHAIN_BIT);
+ /* remove CHAIN-BIT from last LINK TRB */
+ td->td_trb[td->ntrb].dwTrb3 &= ~htole32(XHCI_TRB_3_CHAIN_BIT);
usb_pc_cpu_flush(td->page_cache);
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