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e1000e: delay second read of PHY_STATUS register on failure of first read 

Some PHYs may require two reads of the PHY_STATUS register to determine the
link status.  If the PHY is being accessed by another thread it is possible
the first read could timeout and fail.  In this case, put a delay in so
the second read will pick up the correct link status.

Signed-off-by: Bruce Allan <bruce.w.allan@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Bruce Allan 2009-07-01 13:28:50 +00:00 committed by David S. Miller
parent 28c9195a57
commit 906e8d9792
1 changed files with 6 additions and 1 deletions
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7
drivers/net/e1000e/phy.c
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@ -1531,7 +1531,12 @@ s32 e1000e_phy_has_link_generic(struct e1000_hw *hw, u32 iterations,
*/
ret_val = e1e_rphy(hw, PHY_STATUS, &phy_status);
if (ret_val)
break;
/*
* If the first read fails, another entity may have
* ownership of the resources, wait and try again to
* see if they have relinquished the resources yet.
*/
udelay(usec_interval);
ret_val = e1e_rphy(hw, PHY_STATUS, &phy_status);
if (ret_val)
break;