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e1000e: ensure the link state is correct for serdes links

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This patch ensures that the link state (as reported in
mac->serdes_has_link) will transition to false when autoneg fails to
complete but valid codewords were detected.

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 2009-12-01 15:49:51 +00:00 committed by David S. Miller
parent 17f208deb9
commit 1a40d5c170
1 changed files with 48 additions and 28 deletions
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76
drivers/net/e1000e/82571.c
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@ -1356,8 +1356,20 @@ static s32 e1000_setup_fiber_serdes_link_82571(struct e1000_hw *hw)
* e1000_check_for_serdes_link_82571 - Check for link (Serdes)
* @hw: pointer to the HW structure
*
* Checks for link up on the hardware. If link is not up and we have
* a signal, then we need to force link up.
* Reports the link state as up or down.
*
* If autonegotiation is supported by the link partner, the link state is
* determined by the result of autonegotiation. This is the most likely case.
* If autonegotiation is not supported by the link partner, and the link
* has a valid signal, force the link up.
*
* The link state is represented internally here by 4 states:
*
* 1) down
* 2) autoneg_progress
* 3) autoneg_complete (the link sucessfully autonegotiated)
* 4) forced_up (the link has been forced up, it did not autonegotiate)
*
**/
static s32 e1000_check_for_serdes_link_82571(struct e1000_hw *hw)
{
@ -1383,6 +1395,7 @@ static s32 e1000_check_for_serdes_link_82571(struct e1000_hw *hw)
*/
mac->serdes_link_state =
e1000_serdes_link_autoneg_progress;
mac->serdes_has_link = false;
e_dbg("AN_UP -> AN_PROG\n");
}
break;
@ -1397,57 +1410,64 @@ static s32 e1000_check_for_serdes_link_82571(struct e1000_hw *hw)
if (rxcw & E1000_RXCW_C) {
/* Enable autoneg, and unforce link up */
ew32(TXCW, mac->txcw);
ew32(CTRL,
(ctrl & ~E1000_CTRL_SLU));
ew32(CTRL, (ctrl & ~E1000_CTRL_SLU));
mac->serdes_link_state =
e1000_serdes_link_autoneg_progress;
mac->serdes_has_link = false;
e_dbg("FORCED_UP -> AN_PROG\n");
}
break;
case e1000_serdes_link_autoneg_progress:
/*
* If the LU bit is set in the STATUS register,
* autoneg has completed sucessfully. If not,
* try foring the link because the far end may be
* available but not capable of autonegotiation.
*/
if (status & E1000_STATUS_LU) {
mac->serdes_link_state =
e1000_serdes_link_autoneg_complete;
e_dbg("AN_PROG -> AN_UP\n");
if (rxcw & E1000_RXCW_C) {
/*
* We received /C/ ordered sets, meaning the
* link partner has autonegotiated, and we can
* trust the Link Up (LU) status bit.
*/
if (status & E1000_STATUS_LU) {
mac->serdes_link_state =
e1000_serdes_link_autoneg_complete;
e_dbg("AN_PROG -> AN_UP\n");
mac->serdes_has_link = true;
} else {
/* Autoneg completed, but failed. */
mac->serdes_link_state =
e1000_serdes_link_down;
e_dbg("AN_PROG -> DOWN\n");
}
} else {
/*
* Disable autoneg, force link up and
* full duplex, and change state to forced
* The link partner did not autoneg.
* Force link up and full duplex, and change
* state to forced.
*/
ew32(TXCW,
(mac->txcw & ~E1000_TXCW_ANE));
ew32(TXCW, (mac->txcw & ~E1000_TXCW_ANE));
ctrl |= (E1000_CTRL_SLU | E1000_CTRL_FD);
ew32(CTRL, ctrl);
/* Configure Flow Control after link up. */
ret_val =
e1000e_config_fc_after_link_up(hw);
ret_val = e1000e_config_fc_after_link_up(hw);
if (ret_val) {
e_dbg("Error config flow control\n");
break;
}
mac->serdes_link_state =
e1000_serdes_link_forced_up;
mac->serdes_has_link = true;
e_dbg("AN_PROG -> FORCED_UP\n");
}
mac->serdes_has_link = true;
break;
case e1000_serdes_link_down:
default:
/* The link was down but the receiver has now gained
/*
* The link was down but the receiver has now gained
* valid sync, so lets see if we can bring the link
* up. */
* up.
*/
ew32(TXCW, mac->txcw);
ew32(CTRL,
(ctrl & ~E1000_CTRL_SLU));
ew32(CTRL, (ctrl & ~E1000_CTRL_SLU));
mac->serdes_link_state =
e1000_serdes_link_autoneg_progress;
e_dbg("DOWN -> AN_PROG\n");
@ -1460,9 +1480,9 @@ static s32 e1000_check_for_serdes_link_82571(struct e1000_hw *hw)
e_dbg("ANYSTATE -> DOWN\n");
} else {
/*
* We have sync, and can tolerate one
* invalid (IV) codeword before declaring
* link down, so reread to look again
* We have sync, and can tolerate one invalid (IV)
* codeword before declaring link down, so reread
* to look again.
*/
udelay(10);
rxcw = er32(RXCW);