Re: [PATCH] Re: ep93xx_eth PHY problems
From: Oliver Martin <hidden>
Date: 2008-09-17 09:13:58
Am Tue, 16 Sep 2008 14:51:25 +0200 schrieb Lennert Buytenhek:
OK, can you provide a commit message for this so that I can add it to http://git.wantstofly.org/?p=ep93xx_eth.git/.git;a=summary and ask Jeff to pull it?
Previously, the MDIO clock divisor wasn't set again after the reset in ep93xx_start_hw. It was left at the default, resulting in a 12.5 MHz clock, which the PHY on our TS-7260 (Micrel KSZ8721BL) didn't like too much. Calling ep93xx_mdio_reset after the reset fixed the problems we were having. This small update to the previous patch also adds a call to ep93xx_mdio_reset in ep93xx_stop_hw. Signed-off-by: Oliver Martin <redacted> Index: linux-2.6.26/drivers/net/arm/ep93xx_eth.c ===================================================================
--- linux-2.6.26.orig/drivers/net/arm/ep93xx_eth.c 2008-07-25 03:13:33.000000000 +0200
+++ linux-2.6.26/drivers/net/arm/ep93xx_eth.c 2008-07-25 03:14:52.000000000 +0200@@ -535,6 +535,22 @@ return 1; } +static int ep93xx_mdio_reset(struct mii_bus *bus) +{ + struct ep93xx_priv *ep = bus->priv; + + u32 selfctl = rdl(ep, REG_SELFCTL); + + selfctl &= ~(REG_SELFCTL_MDCDIV_MSK | REG_SELFCTL_PSPRS); + + selfctl |= (ep->mdc_divisor - 1) << REG_SELFCTL_MDCDIV_OFS; + selfctl |= REG_SELFCTL_PSPRS; + + wrl(ep, REG_SELFCTL, selfctl); + + return 0; +} + static int ep93xx_start_hw(struct net_device *dev) { struct ep93xx_priv *ep = netdev_priv(dev);
@@ -553,6 +569,9 @@ return 1; } + /* The reset cleared REG_SELFCTL, so set the MDC divisor again */ + ep93xx_mdio_reset(&ep->mii_bus); + /* Receive descriptor ring. */ addr = ep->descs_dma_addr + offsetof(struct ep93xx_descs, rdesc); wrl(ep, REG_RXDQBADD, addr);
@@ -625,6 +644,9 @@ if (i == 10) printk(KERN_CRIT DRV_MODULE_NAME ": hw failed to reset\n"); + + /* The reset cleared REG_SELFCTL, so set the MDC divisor again */ + ep93xx_mdio_reset(&ep->mii_bus); } static int ep93xx_open(struct net_device *dev)
@@ -776,22 +798,6 @@ return 0; } -static int ep93xx_mdio_reset(struct mii_bus *bus) -{ - struct ep93xx_priv *ep = bus->priv; - - u32 selfctl = rdl(ep, REG_SELFCTL); - - selfctl &= ~(REG_SELFCTL_MDCDIV_MSK | REG_SELFCTL_PSPRS); - - selfctl |= (ep->mdc_divisor - 1) << REG_SELFCTL_MDCDIV_OFS; - selfctl |= REG_SELFCTL_PSPRS; - - wrl(ep, REG_SELFCTL, selfctl); - - return 0; -} - static void ep93xx_get_drvinfo(struct net_device *dev, struct ethtool_drvinfo *info) {