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usb-net/pegasus: fix pegasus carrier detection 

Broken by 4a1728a28a which switched the
return semantics of read_mii_word() but didn't fix usage of
read_mii_word() to conform to the new semantics.

Setting carrier to off based on the NO_CARRIER flag is also incorrect as
that flag only triggers on TX failure and therefore isn't correct when
no frames are being transmitted.  Since there is already a 2*HZ MII
carrier check going on, defer to that.

Add a TRUST_LINK_STATUS feature flag for adapters where the LINK_STATUS
flag is actually correct, and use that rather than the NO_CARRIER flag.

Signed-off-by: Dan Williams <dcbw@redhat.com>
Signed-off-by: Jeff Garzik <jeff@garzik.org>
This commit is contained in:
Dan Williams 2007-04-24 10:20:06 -04:00 committed by Jeff Garzik
parent b748d9e3b8
commit c43c49bd61
2 changed files with 14 additions and 6 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

17
drivers/usb/net/pegasus.c
View File

@ -316,6 +316,7 @@ static int update_eth_regs_async(pegasus_t * pegasus)
return ret;
}
/* Returns 0 on success, error on failure */
static int read_mii_word(pegasus_t * pegasus, __u8 phy, __u8 indx, __u16 * regd)
{
int i;
@ -847,10 +848,16 @@ static void intr_callback(struct urb *urb)
* d[0].NO_CARRIER kicks in only with failed TX.
* ... so monitoring with MII may be safest.
*/
if (d[0] & NO_CARRIER)
netif_carrier_off(net);
else
netif_carrier_on(net);
if (pegasus->features & TRUST_LINK_STATUS) {
if (d[5] & LINK_STATUS)
netif_carrier_on(net);
else
netif_carrier_off(net);
} else {
/* Never set carrier _on_ based on ! NO_CARRIER */
if (d[0] & NO_CARRIER)
netif_carrier_off(net);
}
/* bytes 3-4 == rx_lostpkt, reg 2E/2F */
pegasus->stats.rx_missed_errors += ((d[3] & 0x7f) << 8) | d[4];
@ -950,7 +957,7 @@ static void set_carrier(struct net_device *net)
pegasus_t *pegasus = netdev_priv(net);
u16 tmp;
if (!read_mii_word(pegasus, pegasus->phy, MII_BMSR, &tmp))
if (read_mii_word(pegasus, pegasus->phy, MII_BMSR, &tmp))
return;
if (tmp & BMSR_LSTATUS)

3
drivers/usb/net/pegasus.h
View File

@ -11,6 +11,7 @@
#define PEGASUS_II 0x80000000
#define HAS_HOME_PNA 0x40000000
#define TRUST_LINK_STATUS 0x20000000
#define PEGASUS_MTU 1536
#define RX_SKBS 4
@ -203,7 +204,7 @@ PEGASUS_DEV( "AEI USB Fast Ethernet Adapter", VENDOR_AEILAB, 0x1701,
PEGASUS_DEV( "Allied Telesyn Int. AT-USB100", VENDOR_ALLIEDTEL, 0xb100,
DEFAULT_GPIO_RESET | PEGASUS_II )
PEGASUS_DEV( "Belkin F5D5050 USB Ethernet", VENDOR_BELKIN, 0x0121,
DEFAULT_GPIO_RESET | PEGASUS_II )
DEFAULT_GPIO_RESET | PEGASUS_II | TRUST_LINK_STATUS )
PEGASUS_DEV( "Billionton USB-100", VENDOR_BILLIONTON, 0x0986,
DEFAULT_GPIO_RESET )
PEGASUS_DEV( "Billionton USBLP-100", VENDOR_BILLIONTON, 0x0987,