[Bug 258580] vte(4): restore MDC clock speed register value after MAC reset

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=258580

            Bug ID: 258580
           Summary: vte(4): restore MDC clock speed register value after
                    MAC reset
           Product: Base System
           Version: CURRENT
          Hardware: i386
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: kern
          Assignee: bugs@FreeBSD.org
          Reporter: vezhlys@gmail.com

Created attachment 227988
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=227988&action=edit
if_vte.c patch

Hi,

On some Vortex86 SoCs MDC speed control register needs to be restored to
original value after MAC reset. This issue happens if MAC has non default
VTE_MDCSC register value before reset, and it is erroneously set to default
after, thus causing certain PHY registers fail to be read. Since PHY registers
determine link status, the link is never established (ifconfig media shows
"none" value). Also, one obvious sign is incorrect (not RDC) oui value in
dmesg.

Initially, I found and fixed that in NetBSD, but it affects all BSDs and Linux.
Patch is already applied on NetBSD
(http://cvsweb.netbsd.org/bsdweb.cgi/src/sys/dev/pci/if_vte.c.diff?r1=1.31&r2=1.32)
and Linux
(https://git.kernel.org/pub/scm/linux/kernel/git/netdev/net.git/commit/?id=e3f0cc1a945fcefec0c7c9d9dfd028a51daa1846).

Sending exactly the same patch for FreeBSD. For more info and my debugging
history can be found in
http://gnats.netbsd.org/cgi-bin/query-pr-single.pl?number=53494 thread. I
tested the patch on my affected Vortex86DX3 based system (link is
established/oui is correct), and unaffected DX2, EX2 based machines on FreeBSD
(the patch itself was tested by few more people in NetBSD/Linux too).

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