svn commit: r221812 - head/sys/dev/mii

[Marius Strobl]

Author: marius
Date: Thu May 12 14:16:07 2011
New Revision: 221812
URL: http://svn.freebsd.org/changeset/base/221812

Log:
  Some PHYs like the Level One LXT970 optionally can default to isolation
  after rest, in which case we may need to deisolate it.
  Tested by:    nwhitehorn
  
  MFC after     1 week

Modified:
  head/sys/dev/mii/mii_physubr.c

Modified: head/sys/dev/mii/mii_physubr.c
==============================================================================
--- head/sys/dev/mii/mii_physubr.c      Thu May 12 14:03:29 2011        
(r221811)
+++ head/sys/dev/mii/mii_physubr.c      Thu May 12 14:16:07 2011        
(r221812)
@@ -257,7 +257,7 @@ void
 mii_phy_reset(struct mii_softc *sc)
 {
        struct ifmedia_entry *ife = sc->mii_pdata->mii_media.ifm_cur;
-       int reg, i;
+       int i, reg;
 
        if ((sc->mii_flags & MIIF_NOISOLATE) != 0)
                reg = BMCR_RESET;
@@ -273,11 +273,14 @@ mii_phy_reset(struct mii_softc *sc)
                DELAY(1000);
        }
 
-       if ((sc->mii_flags & MIIF_NOISOLATE) == 0) {
-               if ((ife == NULL && sc->mii_inst != 0) ||
-                   (ife != NULL && IFM_INST(ife->ifm_media) != sc->mii_inst))
-                       PHY_WRITE(sc, MII_BMCR, reg | BMCR_ISO);
-       }
+       /* NB: a PHY may default to isolation. */
+       reg &= ~BMCR_ISO;
+       if ((sc->mii_flags & MIIF_NOISOLATE) == 0 &&
+           ((ife == NULL && sc->mii_inst != 0) ||
+           (ife != NULL && IFM_INST(ife->ifm_media) != sc->mii_inst)))
+               reg |= BMCR_ISO;
+       if (PHY_READ(sc, MII_BMCR) != reg)
+               PHY_WRITE(sc, MII_BMCR, reg);
 }
 
 void
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