git: 9front

Info  •  Files  •  Log  •  Branches

ether82563: fix "phy wedged" for i219, inhibit transmission until link-up (thanks hiro)

Empirically, i219 gets stuck in transmission when we
enqueue packets before the phy signals link-up and
even a full device reset does not recover from that.

Devether inhibits transmission when link is down,
so we set it down by calling ethersetlink(edev, 0)
to avoid the issue.

Also, it appears theres a 1.5s delay required after
the mac signals Link-Up status before touching the
phy registers.

--- a/sys/src/9/pc/ether82563.c

+++ b/sys/src/9/pc/ether82563.c

@@ -1245,6 +1245,11 @@

 	while(waserror())

 		procerror(c, &c->lproc);

+	/* wait 1.5s after first link up to avoid wedged phy */

+	while((csr32r(c, Status) & Lu) == 0)

+		lsleep(c, Lsc);

+	tsleep(&up->sleep, return0, 0, 1500);

+

 	while((phyno = phyprobe(c, 3<<1)) == ~0)

 		lsleep(c, Lsc);

@@ -1496,6 +1501,9 @@

 	r = csr32r(ctlr, Ctrl);

 	r &= ~(Frcspd|Frcdplx);	/* dont force */

 	csr32w(ctlr, Ctrl, Slu|r);

+

+	/* link is down until linkproc sets it up */

+	ethersetlink(edev, 0);

 	snprint(name, sizeof name, "#l%dl", edev->ctlrno);

 	if(csr32r(ctlr, Status) & Tbimode)

-- 

⑨