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Add a comment describing why we force renegotiation when PAUSE is being

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used.  From HITOSHI Osada.
This commit is contained in:
thorpej 2004-04-11 15:42:48 +00:00
parent d742fdc844
commit ad35f1d6fa
1 changed files with 9 additions and 3 deletions
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12
sys/dev/mii/mii_physubr.c
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@ -1,4 +1,4 @@
/* $NetBSD: mii_physubr.c,v 1.40 2004/04/11 15:40:56 thorpej Exp $ */
/* $NetBSD: mii_physubr.c,v 1.41 2004/04/11 15:42:48 thorpej Exp $ */
/*-
* Copyright (c) 1998, 1999, 2000, 2001 The NetBSD Foundation, Inc.
@ -42,7 +42,7 @@
*/
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: mii_physubr.c,v 1.40 2004/04/11 15:40:56 thorpej Exp $");
__KERNEL_RCSID(0, "$NetBSD: mii_physubr.c,v 1.41 2004/04/11 15:42:48 thorpej Exp $");
#include <sys/param.h>
#include <sys/device.h>
@ -114,7 +114,13 @@ mii_phy_setmedia(struct mii_softc *sc)
int bmcr, anar, gtcr;
if (IFM_SUBTYPE(ife->ifm_media) == IFM_AUTO) {
/* Force renegotiation if MIIF_DOPAUSE. */
/*
* Force renegotiation if MIIF_DOPAUSE.
*
* XXX This is only necessary because many NICs don't
* XXX advertise PAUSE capabilities at boot time. Maybe
* XXX we should force this only once?
*/
if ((PHY_READ(sc, MII_BMCR) & BMCR_AUTOEN) == 0 ||
(sc->mii_flags & (MIIF_FORCEANEG|MIIF_DOPAUSE)))
(void) mii_phy_auto(sc, 1);