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e1000e: disable K1 at 1000Mbps for 82577/82578

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This workaround is required for an issue in hardware where noise on the
interconnect between the MAC and PHY could be generated by a lower power
mode (K1) at 1000Mbps resulting in bad packets.  Disable K1 while at 1000
Mbps but keep it enabled for 10/100Mbps and when the cable is disconnected.

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 13:29:08 +00:00
committed by David S. Miller
parent 906e8d9792
commit 7d3cabbcc8
3 changed files with 110 additions and 7 deletions
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4
drivers/net/e1000e/hw.h
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@ -215,6 +215,7 @@ enum e1e_registers {
E1000_SWSM = 0x05B50, /* SW Semaphore */
E1000_FWSM = 0x05B54, /* FW Semaphore */
E1000_SWSM2 = 0x05B58, /* Driver-only SW semaphore */
E1000_CRC_OFFSET = 0x05F50, /* CRC Offset register */
E1000_HICR = 0x08F00, /* Host Interface Control */
};
@ -302,6 +303,9 @@ enum e1e_registers {
#define E1000_KMRNCTRLSTA_REN 0x00200000
#define E1000_KMRNCTRLSTA_DIAG_OFFSET 0x3 /* Kumeran Diagnostic */
#define E1000_KMRNCTRLSTA_DIAG_NELPBK 0x1000 /* Nearend Loopback mode */
#define E1000_KMRNCTRLSTA_K1_CONFIG 0x7
#define E1000_KMRNCTRLSTA_K1_ENABLE 0x140E
#define E1000_KMRNCTRLSTA_K1_DISABLE 0x1400
#define IFE_PHY_EXTENDED_STATUS_CONTROL 0x10
#define IFE_PHY_SPECIAL_CONTROL 0x11 /* 100BaseTx PHY Special Control */