diff options
| author | Ryan Thomas McBride <mcbride@cvs.openbsd.org> | 2003-03-10 12:13:24 +0000 |
|---|---|---|
| committer | Ryan Thomas McBride <mcbride@cvs.openbsd.org> | 2003-03-10 12:13:24 +0000 |
| commit | 6310c13477c56eed14b6bbae72f524811aed3149 (patch) | |
| tree | 3e76c945dfe1cde5d9611d0645ec988f9bef8823 /sys | |
| parent | d7823b52c2020c62ed247d22dd01fbaede9c9e4a (diff) | |
Fix for the "short cable bug" in sis:
A small number of DP83815's will have excessive receive
errors when using short cables (<30m/100feet) in 100Base-TX
mode. This patch was taken from the National Semiconductor
linux driver and (supposedly - no mention of this in any NS
docs) modifies the dsp's signal attenuation.
ok jason@ deraadt@ markus@
From Willem Dijkstra wpd at xs4all dot nl
Diffstat (limited to 'sys')
| -rw-r--r-- | sys/dev/pci/if_sis.c | 27 |
1 files changed, 26 insertions, 1 deletions
diff --git a/sys/dev/pci/if_sis.c b/sys/dev/pci/if_sis.c index 18a9f72419a..07388e1fc61 100644 --- a/sys/dev/pci/if_sis.c +++ b/sys/dev/pci/if_sis.c @@ -1,4 +1,4 @@ -/* $OpenBSD: if_sis.c,v 1.30 2002/11/22 10:38:48 markus Exp $ */ +/* $OpenBSD: if_sis.c,v 1.31 2003/03/10 12:13:23 mcbride Exp $ */ /* * Copyright (c) 1997, 1998, 1999 * Bill Paul <wpaul@ctr.columbia.edu>. All rights reserved. @@ -1445,6 +1445,7 @@ void sis_init(xsc) struct ifnet *ifp = &sc->arpcom.ac_if; struct mii_data *mii; int s; + int tmp; s = splnet(); @@ -1588,6 +1589,30 @@ void sis_init(xsc) CSR_WRITE_4(sc, NS_PHY_TDATA, 0x0000); CSR_WRITE_4(sc, NS_PHY_DSPCFG, 0x5040); CSR_WRITE_4(sc, NS_PHY_SDCFG, 0x008C); + + /* + * A small number of DP83815's will have excessive receive + * errors when using short cables (<30m/100feet) in 100Base-TX + * mode. This patch was taken from the National Semiconductor + * linux driver and (supposedly - no mention of this in any NS + * docs) modifies the dsp's signal attenuation. + */ + if (IFM_SUBTYPE(mii->mii_media_active) != IFM_10_T) { + CSR_WRITE_4(sc, NS_PHY_PAGE, 0x0001); + tmp = CSR_READ_4(sc, NS_PHY_DSPCFG); + tmp &= 0xFFF; + CSR_WRITE_4(sc, NS_PHY_DSPCFG, (tmp | 0x1000)); + DELAY(100); + tmp = CSR_READ_4(sc, NS_PHY_TDATA); + tmp &= 0xFF; + if (!(tmp & 0x80) || (tmp >= 0xD8)) { + CSR_WRITE_4(sc, NS_PHY_TDATA, 0xE8); + tmp = CSR_READ_4(sc, NS_PHY_DSPCFG); + CSR_WRITE_4(sc, NS_PHY_DSPCFG, (tmp | 0x20)); + } else { + CSR_WRITE_4(sc, NS_PHY_PAGE, 0); + } + } } ifp->if_flags |= IFF_RUNNING; |