diff options
| author | hselasky <hselasky@FreeBSD.org> | 2013-12-12 08:34:51 +0000 |
|---|---|---|
| committer | hselasky <hselasky@FreeBSD.org> | 2013-12-12 08:34:51 +0000 |
| commit | a00f1af7e6eaa783993b67961962d359713c15cc (patch) | |
| tree | d8a862072f5fda059b98017cdc24c245c2c66f0e /sys/dev/usb/controller/xhci.c | |
| parent | 4dd7fdae6aa8630bbc5778e1031013bbe02134f5 (diff) | |
| download | FreeBSD-src-a00f1af7e6eaa783993b67961962d359713c15cc.zip FreeBSD-src-a00f1af7e6eaa783993b67961962d359713c15cc.tar.gz | |
Set chain bit correctly. This will fix some problems sending and
receiving Zero Length Packets, ZLPs. See comment in code for more
information.
MFC after: 1 week
Reported by: Kohji Okuno <okuno.kohji@jp.panasonic.com>
Diffstat (limited to 'sys/dev/usb/controller/xhci.c')
| -rw-r--r-- | sys/dev/usb/controller/xhci.c | 13 |
1 files changed, 11 insertions, 2 deletions
diff --git a/sys/dev/usb/controller/xhci.c b/sys/dev/usb/controller/xhci.c index 48c5edb..c56e6f0 100644 --- a/sys/dev/usb/controller/xhci.c +++ b/sys/dev/usb/controller/xhci.c @@ -1892,7 +1892,16 @@ 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); @@ -1930,7 +1939,7 @@ 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); |
