i386/112179: sis driver for natsemi DP83815D autonegotiate failure

[Mark Willson]

>Number:         112179
>Category:       i386
>Synopsis:       sis driver for natsemi DP83815D autonegotiate failure
>Confidential:   no
>Severity:       non-critical
>Priority:       low
>Responsible:    freebsd-i386
>State:          open
>Quarter:        
>Keywords:       
>Date-Required:
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Fri Apr 27 12:10:08 GMT 2007
>Closed-Date:
>Last-Modified:
>Originator:     Mark Willson
>Release:        6.2 Release
>Organization:
>Environment:
FreeBSD crimson 6.2-RELEASE FreeBSD 6.2-RELEASE #23: Fri Apr 27 12:24:50 BST 2007     mark at crimson:/usr/obj/usr/src/sys/CRIMSON  i386
>Description:
The if_sis.c driver for the Natsemi DP38315D chip fails to autonegotiate properly on a 100baseTX link if the connection breaks for less than 4 seconds.  Ethernet cable is around 5m in length (short cable fix invoked).

The patch below fixes the problem for me.



>How-To-Repeat:
Run sis0 in 100baseTX mode.  Disconnect ethernet cable for less than 4 seconds.  On reconnection, short cable fix reg is 0, and sis0 interface is non-functional.
>Fix:
Apply the following patch to sys/pci/if_sis.c

--- if_sis.c.orig       Fri Apr 27 12:41:14 2007
+++ if_sis.c    Fri Apr 27 12:41:32 2007
@@ -1909,7 +1909,7 @@
        if (sc->sis_type == SIS_TYPE_83815 && sc->sis_srr <= NS_SRR_15D) {
                CSR_WRITE_4(sc, NS_PHY_PAGE, 0x0001);
                CSR_WRITE_4(sc, NS_PHY_CR, 0x189C);
-               if (sc->sis_srr == NS_SRR_15C) {
+               if (sc->sis_srr <= NS_SRR_15D) {
                        /* set val for c2 */
                        CSR_WRITE_4(sc, NS_PHY_TDATA, 0x0000);
                        /* load/kill c2 */


>Release-Note:
>Audit-Trail:
>Unformatted: