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e1000e: rework disable K1 at 1000Mbps for 82577/82578

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This patch reworks a previous workaround (commit 7d3cabbcc) 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.  The original version of this
workaround was found to be incomplete.

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
2009-10-29 13:46:05 +00:00
committed by David S. Miller
parent f523d2114e
commit 1d5846b921
5 changed files with 190 additions and 28 deletions
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14
drivers/net/e1000e/e1000.h
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@@ -141,6 +141,20 @@ struct e1000_info;
#define HV_TNCRS_UPPER PHY_REG(778, 29) /* Transmit with no CRS */
#define HV_TNCRS_LOWER PHY_REG(778, 30)
/* BM PHY Copper Specific Status */
#define BM_CS_STATUS 17
#define BM_CS_STATUS_LINK_UP 0x0400
#define BM_CS_STATUS_RESOLVED 0x0800
#define BM_CS_STATUS_SPEED_MASK 0xC000
#define BM_CS_STATUS_SPEED_1000 0x8000
/* 82577 Mobile Phy Status Register */
#define HV_M_STATUS 26
#define HV_M_STATUS_AUTONEG_COMPLETE 0x1000
#define HV_M_STATUS_SPEED_MASK 0x0300
#define HV_M_STATUS_SPEED_1000 0x0200
#define HV_M_STATUS_LINK_UP 0x0040
enum e1000_boards {
board_82571,
board_82572,