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net/ixgbe/base: clean up X557 link status check

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This patch cleans up the code and clarifies the comment around
the X557 PHY link status check in ixgbe_check_link_t_x550em().

Signed-off-by: Wei Dai <wei.dai@intel.com>
This commit is contained in:
Wei Dai 2016-12-21 17:47:49 +08:00 committed by Ferruh Yigit
parent 5b313c497f
commit 2f8c0a2335
1 changed files with 11 additions and 14 deletions
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25
drivers/net/ixgbe/base/ixgbe_x550.c
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@ -4660,7 +4660,7 @@ s32 ixgbe_check_link_t_X550em(struct ixgbe_hw *hw, ixgbe_link_speed *speed,
bool *link_up, bool link_up_wait_to_complete)
{
u32 status;
u16 autoneg_status;
u16 i, autoneg_status = 0;
if (hw->mac.ops.get_media_type(hw) != ixgbe_media_type_copper)
return IXGBE_ERR_CONFIG;
@ -4673,21 +4673,18 @@ s32 ixgbe_check_link_t_X550em(struct ixgbe_hw *hw, ixgbe_link_speed *speed,
return status;
/* MAC link is up, so check external PHY link.
* Read this twice back to back to indicate current status.
* X557 PHY. Link status is latching low, and can only be used to detect
* link drop, and not the current status of the link without performing
* back-to-back reads.
*/
status = hw->phy.ops.read_reg(hw, IXGBE_MDIO_AUTO_NEG_STATUS,
IXGBE_MDIO_AUTO_NEG_DEV_TYPE,
&autoneg_status);
for (i = 0; i < 2; i++) {
status = hw->phy.ops.read_reg(hw, IXGBE_MDIO_AUTO_NEG_STATUS,
IXGBE_MDIO_AUTO_NEG_DEV_TYPE,
&autoneg_status);
if (status != IXGBE_SUCCESS)
return status;
status = hw->phy.ops.read_reg(hw, IXGBE_MDIO_AUTO_NEG_STATUS,
IXGBE_MDIO_AUTO_NEG_DEV_TYPE,
&autoneg_status);
if (status != IXGBE_SUCCESS)
return status;
if (status != IXGBE_SUCCESS)
return status;
}
/* If external PHY link is not up, then indicate link not up */
if (!(autoneg_status & IXGBE_MDIO_AUTO_NEG_LINK_STATUS))