Date: Thu, 19 Dec 2013 07:17:19 +0000 (UTC) From: Hans Petter Selasky <hselasky@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-stable@freebsd.org, svn-src-stable-8@freebsd.org Subject: svn commit: r259605 - stable/8/sys/dev/usb/controller Message-ID: <201312190717.rBJ7HJMf096301@svn.freebsd.org>
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Author: hselasky Date: Thu Dec 19 07:17:18 2013 New Revision: 259605 URL: http://svnweb.freebsd.org/changeset/base/259605 Log: MFC r259248 and r259462: Set chain bit correctly. This will fix some problems sending and receiving Zero Length Packets, ZLPs. See comment in code for more information. Modified: stable/8/sys/dev/usb/controller/xhci.c Directory Properties: stable/8/sys/ (props changed) stable/8/sys/dev/ (props changed) stable/8/sys/dev/usb/ (props changed) Modified: stable/8/sys/dev/usb/controller/xhci.c ============================================================================== --- stable/8/sys/dev/usb/controller/xhci.c Thu Dec 19 07:17:07 2013 (r259604) +++ stable/8/sys/dev/usb/controller/xhci.c Thu Dec 19 07:17:18 2013 (r259605) @@ -1858,7 +1858,16 @@ restart: td->td_trb[x].dwTrb2 = htole32(dword); dword = XHCI_TRB_3_TYPE_SET(XHCI_TRB_TYPE_LINK) | - XHCI_TRB_3_CYCLE_BIT | XHCI_TRB_3_IOC_BIT; + XHCI_TRB_3_CYCLE_BIT | XHCI_TRB_3_IOC_BIT | + /* + * CHAIN-BIT: Ensure that a multi-TRB IN-endpoint + * frame only receives a single short packet event + * by setting the CHAIN bit in the LINK field. In + * addition some XHCI controllers have problems + * sending a ZLP unless the CHAIN-BIT is set in + * the LINK TRB. + */ + XHCI_TRB_3_CHAIN_BIT; td->td_trb[x].dwTrb3 = htole32(dword); @@ -1896,9 +1905,11 @@ restart: } /* clear TD SIZE to zero, hence this is the last TRB */ - /* remove chain bit because this is the last TRB in the chain */ + /* 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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