[src/trunk]: src/sys/dev/mii - Control BMCR_PDOWN for IFM_NONE. Some chips st...

[msaitoh <msaitoh%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/c86e4acdae88
branches:  trunk
changeset: 447073:c86e4acdae88
user:      msaitoh <msaitoh%NetBSD.org@localhost>
date:      Sun Dec 30 06:33:30 2018 +0000

description:
- Control BMCR_PDOWN for IFM_NONE. Some chips still don't work as expected.
  It would be required to modify PSCR and/or other register.
- Set mii_media_active correctly on non-autonego mode.

diffstat:

 sys/dev/mii/makphy.c |  70 ++++++++++++++++++++++++++++++++++++++++-----------
 1 files changed, 55 insertions(+), 15 deletions(-)

diffs (131 lines):

diff -r d2def7888d4a -r c86e4acdae88 sys/dev/mii/makphy.c
--- a/sys/dev/mii/makphy.c      Sun Dec 30 05:05:21 2018 +0000
+++ b/sys/dev/mii/makphy.c      Sun Dec 30 06:33:30 2018 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: makphy.c,v 1.46 2018/12/28 06:20:32 msaitoh Exp $      */
+/*     $NetBSD: makphy.c,v 1.47 2018/12/30 06:33:30 msaitoh Exp $      */
 
 /*-
  * Copyright (c) 1998, 1999, 2000, 2001 The NetBSD Foundation, Inc.
@@ -55,7 +55,7 @@
  */
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: makphy.c,v 1.46 2018/12/28 06:20:32 msaitoh Exp $");
+__KERNEL_RCSID(0, "$NetBSD: makphy.c,v 1.47 2018/12/30 06:33:30 msaitoh Exp $");
 
 #include <sys/param.h>
 #include <sys/systm.h>
@@ -155,6 +155,9 @@
          NULL },
 };
 
+#define MAKARG_PDOWN   true    /* Power DOWN */
+#define MAKARG_PUP     false   /* Power UP */
+
 static int
 makphymatch(device_t parent, cfdata_t match, void *aux)
 {
@@ -267,6 +270,30 @@
        mii_phy_reset(sc);
 }
 
+static void
+makphy_pdown(struct mii_softc *sc, bool pdown)
+{
+       int bmcr, new;
+       bool need_reset = false;
+
+       /*
+        * XXX
+        * PSCR (register 16) should be modified on some chips.
+        */
+
+       bmcr = PHY_READ(sc, MII_BMCR);
+       if (pdown)
+               new = bmcr | BMCR_PDOWN;
+       else
+               new = bmcr & ~BMCR_PDOWN;
+       if (bmcr != new)
+               need_reset = true;
+
+       if (need_reset)
+               new |= BMCR_RESET;
+       PHY_WRITE(sc, MII_BMCR, new);
+}
+
 static int
 makphy_service(struct mii_softc *sc, struct mii_data *mii, int cmd)
 {
@@ -302,13 +329,19 @@
                if ((mii->mii_ifp->if_flags & IFF_UP) == 0)
                        break;
 
+               /* Try to power up the PHY in case it's down */
+               if (IFM_SUBTYPE(ife->ifm_media) != IFM_NONE)
+                       makphy_pdown(sc, MAKARG_PUP);
+
                mii_phy_setmedia(sc);
 
                /*
                 * If autonegitation is not enabled, we need a
                 * software reset for the settings to take effect.
                 */
-               if (IFM_SUBTYPE(ife->ifm_media) != IFM_AUTO) {
+               if (IFM_SUBTYPE(ife->ifm_media) == IFM_NONE)
+                       makphy_pdown(sc, MAKARG_PDOWN);
+               else if (IFM_SUBTYPE(ife->ifm_media) != IFM_AUTO) {
                        bmcr = PHY_READ(sc, MII_BMCR);
                        PHY_WRITE(sc, MII_BMCR, bmcr | BMCR_RESET);
                }
@@ -354,23 +387,30 @@
        if (pssr & PSSR_LINK)
                mii->mii_media_status |= IFM_ACTIVE;
 
+       if (bmcr & BMCR_LOOP)
+               mii->mii_media_active |= IFM_LOOP;
+
        if (bmcr & BMCR_ISO) {
                mii->mii_media_active |= IFM_NONE;
                mii->mii_media_status = 0;
                return;
        }
 
-       if (bmcr & BMCR_LOOP)
-               mii->mii_media_active |= IFM_LOOP;
-
-       /*
-        * Check Speed and Duplex Resolved bit.
-        * XXX Note that this bit is always 1 when autonego is not enabled.
-        */
-       if (!(pssr & PSSR_RESOLVED)) {
-               /* Erg, still trying, I guess... */
-               mii->mii_media_active |= IFM_NONE;
-               return;
+       if ((bmcr & BMCR_AUTOEN) != 0) {
+               /*
+                * Check Speed and Duplex Resolved bit.
+                * Note that this bit is always 1 when autonego is not enabled.
+                */
+               if (!(pssr & PSSR_RESOLVED)) {
+                       /* Erg, still trying, I guess... */
+                       mii->mii_media_active |= IFM_NONE;
+                       return;
+               }
+       } else {
+               if ((pssr & PSSR_LINK) == 0) {
+                       mii->mii_media_active |= IFM_NONE;
+                       return;
+               }
        }
 
        /* XXX FIXME: Use different page for Fiber on newer chips */
@@ -387,7 +427,7 @@
                case SPEED_10:
                        mii->mii_media_active |= IFM_10_T;
                        break;
-               default:
+               default: /* Undefined (reserved) value */
                        mii->mii_media_active |= IFM_NONE;
                        mii->mii_media_status = 0;
                        return;