e1000e: disable K1 at 1000Mbps for 82577/82578

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>

1 files changed, 4 insertions, 0 deletions

diff --git a/drivers/net/e1000e/hw.h b/drivers/net/e1000e/hw.h
index 163c1c0cfee7..fd44d9f90769 100644
--- a/drivers/net/e1000e/hw.h
+++ b/drivers/net/e1000e/hw.h
@@ -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 */