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e1000e: Fixes possible phy corrupton on 82571 designs.

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Phy corruption has been observed on 2-port 82571 adapters, and is root-caused
to lack of synchronization between the 2 driver instances, which conflict
when attempting to access the phy via the single MDIC register.
A semaphore exists for this purpose, and is now used on these designs. Because
PXE &/or EFI boot code (which we cannot expect to be built with this fix) may
leave the inter-instance semaphore in an invalid initial state when the driver
first loads, this fix also includes a one-time (per driver load) fix-up of the
semaphore initial state.

Signed-off-by: dave graham <david.graham@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:
Dave Graham
2009-06-08 14:28:17 +00:00
committed by David S. Miller
parent 8459464f07
commit 23a2d1b233
3 changed files with 83 additions and 7 deletions
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2
drivers/net/e1000e/hw.h
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@@ -214,6 +214,7 @@ enum e1e_registers {
E1000_FACTPS = 0x05B30, /* Function Active and Power State to MNG */
E1000_SWSM = 0x05B50, /* SW Semaphore */
E1000_FWSM = 0x05B54, /* FW Semaphore */
E1000_SWSM2 = 0x05B58, /* Driver-only SW semaphore */
E1000_HICR = 0x08F00, /* Host Interface Control */
};
@@ -883,6 +884,7 @@ struct e1000_fc_info {
struct e1000_dev_spec_82571 {
bool laa_is_present;
bool alt_mac_addr_is_present;
u32 smb_counter;
};
struct e1000_shadow_ram {