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Date: Fri, 26 Jan 2007 14:36:29 +0000 (GMT)
From: "Maciej W. Rozycki" <macro@...ux-mips.org>
To: Kumar Gala <galak@...nel.crashing.org>
cc: Jeff Garzik <jgarzik@...ox.com>,
Andy Fleming <afleming@...escale.com>, netdev@...r.kernel.org
Subject: Re: [PATCH] RFC: Broadcom PHY forcing fix
Kumar,
> I've got a BCM5461 that requires this fix to be able to force the speeds
> on the PHY. Not sure if its needed on the other variants or not. The
> problem is the genphy_config_aneg resets the PHY when forcing the speed
> and once we reset the BCM5461 it doesn't remember any of its settings.
I recall seeing a similar problem before and having checked with the IEEE
spec I believe it's the generic code that is incorrect. Following is my
fix to address this problem. Please try and see if it works for you.
I am waiting for 2.6.20 to happen before I recheck my list of patches
related to the BCM1250 MAC and the PHY library and (re)submit whatever is
still relevant. This patch is one of candidates.
Maciej
patch-mips-2.6.18-20060920-phy-forcing-1
diff -up --recursive --new-file linux-mips-2.6.18-20060920.macro/drivers/net/phy/phy.c linux-mips-2.6.18-20060920/drivers/net/phy/phy.c
--- linux-mips-2.6.18-20060920.macro/drivers/net/phy/phy.c 2006-08-05 04:58:46.000000000 +0000
+++ linux-mips-2.6.18-20060920/drivers/net/phy/phy.c 2006-09-25 03:03:45.000000000 +0000
@@ -713,6 +713,8 @@ static void phy_timer(unsigned long data
} else {
phydev->state = PHY_NOLINK;
netif_carrier_off(phydev->attached_dev);
+ phydev->link_timeout =
+ PHY_NOLINK_TIMEOUT;
}
phydev->adjust_link(phydev->attached_dev);
@@ -759,6 +761,9 @@ static void phy_timer(unsigned long data
phydev->state = PHY_RUNNING;
netif_carrier_on(phydev->attached_dev);
phydev->adjust_link(phydev->attached_dev);
+ } else if (0 == phydev->link_timeout--) {
+ phydev->autoneg = AUTONEG_ENABLE;
+ needs_aneg = 1;
}
break;
case PHY_FORCING:
@@ -797,6 +802,7 @@ static void phy_timer(unsigned long data
} else {
phydev->state = PHY_NOLINK;
netif_carrier_off(phydev->attached_dev);
+ phydev->link_timeout = PHY_NOLINK_TIMEOUT;
}
phydev->adjust_link(phydev->attached_dev);
diff -up --recursive --new-file linux-mips-2.6.18-20060920.macro/drivers/net/phy/phy_device.c linux-mips-2.6.18-20060920/drivers/net/phy/phy_device.c
--- linux-mips-2.6.18-20060920.macro/drivers/net/phy/phy_device.c 2006-09-20 20:50:26.000000000 +0000
+++ linux-mips-2.6.18-20060920/drivers/net/phy/phy_device.c 2006-09-25 01:51:34.000000000 +0000
@@ -325,10 +325,18 @@ EXPORT_SYMBOL(genphy_config_advert);
* Please see phy_sanitize_settings() */
int genphy_setup_forced(struct phy_device *phydev)
{
- int ctl = BMCR_RESET;
+ int ctl;
phydev->pause = phydev->asym_pause = 0;
+ ctl = phy_read(phydev, MII_BMCR);
+
+ ctl &= ~(BMCR_ANENABLE | BMCR_ANRESTART);
+
+ ctl &= ~(BMCR_ISOLATE);
+
+ ctl &= ~(BMCR_SPEED1000 | BMCR_SPEED100 | BMCR_FULLDPLX);
+
if (SPEED_1000 == phydev->speed)
ctl |= BMCR_SPEED1000;
else if (SPEED_100 == phydev->speed)
@@ -336,16 +344,8 @@ int genphy_setup_forced(struct phy_devic
if (DUPLEX_FULL == phydev->duplex)
ctl |= BMCR_FULLDPLX;
-
- ctl = phy_write(phydev, MII_BMCR, ctl);
-
- if (ctl < 0)
- return ctl;
- /* We just reset the device, so we'd better configure any
- * settings the PHY requires to operate */
- if (phydev->drv->config_init)
- ctl = phydev->drv->config_init(phydev);
+ ctl = phy_write(phydev, MII_BMCR, ctl);
return ctl;
}
diff -up --recursive --new-file linux-mips-2.6.18-20060920.macro/include/linux/phy.h linux-mips-2.6.18-20060920/include/linux/phy.h
--- linux-mips-2.6.18-20060920.macro/include/linux/phy.h 2006-08-29 04:58:59.000000000 +0000
+++ linux-mips-2.6.18-20060920/include/linux/phy.h 2006-09-29 14:19:10.000000000 +0000
@@ -50,6 +50,7 @@
#define PHY_STATE_TIME 1
#define PHY_FORCE_TIMEOUT 10
#define PHY_AN_TIMEOUT 10
+#define PHY_NOLINK_TIMEOUT 3
#define PHY_MAX_ADDR 32
-
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