[net-next 1/6] e1000e: Disable Far-End LoopBack following reset on 80003ES2LAN.
From: Jeff Kirsher <hidden>
Date: 2012-04-27 09:36:56
Subsystem:
intel ethernet drivers, networking drivers, the rest · Maintainers:
Tony Nguyen, Przemek Kitszel, Andrew Lunn, "David S. Miller", Eric Dumazet, Jakub Kicinski, Paolo Abeni, Linus Torvalds
From: Matthew Vick <redacted> 80003ES2LAN has an errata such that far-end loopback may be activated by bit errors producing a reserved symbol. In order to disable far-end loopback quickly enough, disable it immediately following a reset. Signed-off-by: Matthew Vick <redacted> Tested-by: Jeff Pieper <redacted> Signed-off-by: Jeff Kirsher <redacted> --- drivers/net/ethernet/intel/e1000e/80003es2lan.c | 8 ++++++++ 1 files changed, 8 insertions(+), 0 deletions(-)
diff --git a/drivers/net/ethernet/intel/e1000e/80003es2lan.c b/drivers/net/ethernet/intel/e1000e/80003es2lan.c
index fbc84d4..a212846 100644
--- a/drivers/net/ethernet/intel/e1000e/80003es2lan.c
+++ b/drivers/net/ethernet/intel/e1000e/80003es2lan.c@@ -764,6 +764,7 @@ static s32 e1000_reset_hw_80003es2lan(struct e1000_hw *hw) { u32 ctrl; s32 ret_val; + u16 kum_reg_data; /* * Prevent the PCI-E bus from sticking if there is no TLP connection
@@ -789,6 +790,13 @@ static s32 e1000_reset_hw_80003es2lan(struct e1000_hw *hw) ew32(CTRL, ctrl | E1000_CTRL_RST); e1000_release_phy_80003es2lan(hw); + /* Disable IBIST slave mode (far-end loopback) */ + e1000_read_kmrn_reg_80003es2lan(hw, E1000_KMRNCTRLSTA_INBAND_PARAM, + &kum_reg_data); + kum_reg_data |= E1000_KMRNCTRLSTA_IBIST_DISABLE; + e1000_write_kmrn_reg_80003es2lan(hw, E1000_KMRNCTRLSTA_INBAND_PARAM, + kum_reg_data); + ret_val = e1000e_get_auto_rd_done(hw); if (ret_val) /* We don't want to continue accessing MAC registers. */
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1.7.7.6