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forcedeth: add phy_power_down parameter, leave phy powered up by default (v2)

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Add a phy_power_down parameter to forcedeth: set to 1 to power down the
phy and disable the link when an interface goes down; set to 0 to always
leave the phy powered up.

The phy power state persists across reboots; Windows, some BIOSes, and
older versions of Linux don't bother to power up the phy again, forcing
users to remove all power to get the interface working (see
http://bugzilla.kernel.org/show_bug.cgi?id=13072).  Leaving the phy
powered on is the safest default behavior.  Users accustomed to seeing
the link state reflect the interface state and/or wanting to minimize
power consumption can set phy_power_down=1 if compatibility with other
OSes is not an issue.

Signed-off-by: Ed Swierk <eswierk@aristanetworks.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Ed Swierk 2009-06-02 00:19:52 -07:00 committed by David S. Miller
parent fc23ffe075
commit 5a9a8e32eb
1 changed files with 13 additions and 2 deletions
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15
drivers/net/forcedeth.c
View file

@ -897,6 +897,12 @@ enum {
};
static int phy_cross = NV_CROSSOVER_DETECTION_DISABLED;
/*
* Power down phy when interface is down (persists through reboot;
* older Linux and other OSes may not power it up again)
*/
static int phy_power_down = 0;
static inline struct fe_priv *get_nvpriv(struct net_device *dev)
{
return netdev_priv(dev);
@ -1485,7 +1491,10 @@ static int phy_init(struct net_device *dev)
/* restart auto negotiation, power down phy */
mii_control = mii_rw(dev, np->phyaddr, MII_BMCR, MII_READ);
mii_control |= (BMCR_ANRESTART | BMCR_ANENABLE | BMCR_PDOWN);
mii_control |= (BMCR_ANRESTART | BMCR_ANENABLE);
if (phy_power_down) {
mii_control |= BMCR_PDOWN;
}
if (mii_rw(dev, np->phyaddr, MII_BMCR, mii_control)) {
return PHY_ERROR;
}
@ -5513,7 +5522,7 @@ static int nv_close(struct net_device *dev)
nv_drain_rxtx(dev);
if (np->wolenabled) {
if (np->wolenabled || !phy_power_down) {
writel(NVREG_PFF_ALWAYS|NVREG_PFF_MYADDR, base + NvRegPacketFilterFlags);
nv_start_rx(dev);
} else {
@ -6367,6 +6376,8 @@ module_param(dma_64bit, int, 0);
MODULE_PARM_DESC(dma_64bit, "High DMA is enabled by setting to 1 and disabled by setting to 0.");
module_param(phy_cross, int, 0);
MODULE_PARM_DESC(phy_cross, "Phy crossover detection for Realtek 8201 phy is enabled by setting to 1 and disabled by setting to 0.");
module_param(phy_power_down, int, 0);
MODULE_PARM_DESC(phy_power_down, "Power down phy and disable link when interface is down (1), or leave phy powered up (0).");
MODULE_AUTHOR("Manfred Spraul <manfred@colorfullife.com>");
MODULE_DESCRIPTION("Reverse Engineered nForce ethernet driver");