提交 8762cec8 编写于 作者: S Steve Glendinning 提交者: David S. Miller

smsc75xx: add explicit test that device is READY

This patch adds an explicit test that the READY bit is set on
the device when attempting to initialize it.

If this bit is clear then the device hasn't succesfully started
all its clocks, and this patch helps make the resulting logged
error more helpful.
Signed-off-by: NSteve Glendinning <steve.glendinning@shawell.net>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>
上级 e0e474a8
...@@ -756,6 +756,26 @@ static int smsc75xx_set_features(struct net_device *netdev, ...@@ -756,6 +756,26 @@ static int smsc75xx_set_features(struct net_device *netdev,
return 0; return 0;
} }
static int smsc75xx_wait_ready(struct usbnet *dev)
{
int timeout = 0;
do {
u32 buf;
int ret = smsc75xx_read_reg(dev, PMT_CTL, &buf);
check_warn_return(ret, "Failed to read PMT_CTL: %d", ret);
if (buf & PMT_CTL_DEV_RDY)
return 0;
msleep(10);
timeout++;
} while (timeout < 100);
netdev_warn(dev->net, "timeout waiting for device ready");
return -EIO;
}
static int smsc75xx_reset(struct usbnet *dev) static int smsc75xx_reset(struct usbnet *dev)
{ {
struct smsc75xx_priv *pdata = (struct smsc75xx_priv *)(dev->data[0]); struct smsc75xx_priv *pdata = (struct smsc75xx_priv *)(dev->data[0]);
...@@ -764,6 +784,9 @@ static int smsc75xx_reset(struct usbnet *dev) ...@@ -764,6 +784,9 @@ static int smsc75xx_reset(struct usbnet *dev)
netif_dbg(dev, ifup, dev->net, "entering smsc75xx_reset"); netif_dbg(dev, ifup, dev->net, "entering smsc75xx_reset");
ret = smsc75xx_wait_ready(dev);
check_warn_return(ret, "device not ready in smsc75xx_reset");
ret = smsc75xx_read_reg(dev, HW_CFG, &buf); ret = smsc75xx_read_reg(dev, HW_CFG, &buf);
check_warn_return(ret, "Failed to read HW_CFG: %d", ret); check_warn_return(ret, "Failed to read HW_CFG: %d", ret);
......
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