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amd-xgbe: Prevent looping forever if timestamp update fails

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Just to be on the safe side, should the update of the timestamp registers
not complete, issue a warning rather than looping forever waiting for the
update to complete.

Signed-off-by: Tom Lendacky <thomas.lendacky@amd.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Lendacky, Thomas 2017-06-28 13:42:07 -05:00 committed by David S. Miller
parent 93845d5f1b
commit 9018ff5331
1 changed files with 13 additions and 2 deletions
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15
drivers/net/ethernet/amd/xgbe/xgbe-dev.c
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@ -1497,26 +1497,37 @@ static void xgbe_rx_desc_init(struct xgbe_channel *channel)
static void xgbe_update_tstamp_addend(struct xgbe_prv_data *pdata,
unsigned int addend)
{
unsigned int count = 10000;
/* Set the addend register value and tell the device */
XGMAC_IOWRITE(pdata, MAC_TSAR, addend);
XGMAC_IOWRITE_BITS(pdata, MAC_TSCR, TSADDREG, 1);
/* Wait for addend update to complete */
while (XGMAC_IOREAD_BITS(pdata, MAC_TSCR, TSADDREG))
while (--count && XGMAC_IOREAD_BITS(pdata, MAC_TSCR, TSADDREG))
udelay(5);
if (!count)
netdev_err(pdata->netdev,
"timed out updating timestamp addend register\n");
}
static void xgbe_set_tstamp_time(struct xgbe_prv_data *pdata, unsigned int sec,
unsigned int nsec)
{
unsigned int count = 10000;
/* Set the time values and tell the device */
XGMAC_IOWRITE(pdata, MAC_STSUR, sec);
XGMAC_IOWRITE(pdata, MAC_STNUR, nsec);
XGMAC_IOWRITE_BITS(pdata, MAC_TSCR, TSINIT, 1);
/* Wait for time update to complete */
while (XGMAC_IOREAD_BITS(pdata, MAC_TSCR, TSINIT))
while (--count && XGMAC_IOREAD_BITS(pdata, MAC_TSCR, TSINIT))
udelay(5);
if (!count)
netdev_err(pdata->netdev, "timed out initializing timestamp\n");
}
static u64 xgbe_get_tstamp_time(struct xgbe_prv_data *pdata)