e1000/base: fix link flap on 82579

Several customers have reported a link flap issue on 82579. The symptoms
are random and intermittent link losses when 82579 is connected to specific
switches. Issue has been root caused as interoperability problem between
the NIC and at least some Broadcom PHYs in the Energy Efficient Ethernet
wake mechanism.
To fix the issue, we are disabling the Phase Locked Loop shutdown in 100M
Low Power Idle. This solution will cause an increase of power in 100M EEE
link. It may cost additional 28mW in this specific mode.

Signed-off-by: Wenzhuo Lu <wenzhuo.lu@intel.com>

diff --git a/drivers/net/e1000/base/e1000_ich8lan.c b/drivers/net/e1000/base/e1000_ich8lan.c
index 270e906..a11e085 100644 (file)
--- a/drivers/net/e1000/base/e1000_ich8lan.c
+++ b/drivers/net/e1000/base/e1000_ich8lan.c
@@ -936,6 +936,17 @@ s32 e1000_set_eee_pchlan(struct e1000_hw *hw)
                }
        }
 
+       if (hw->phy.type == e1000_phy_82579) {
+               ret_val = e1000_read_emi_reg_locked(hw, I82579_LPI_PLL_SHUT,
+                                                   &data);
+               if (ret_val)
+                       goto release;
+
+               data &= ~I82579_LPI_100_PLL_SHUT;
+               ret_val = e1000_write_emi_reg_locked(hw, I82579_LPI_PLL_SHUT,
+                                                    data);
+       }
+
        /* R/Clr IEEE MMD 3.1 bits 11:10 - Tx/Rx LPI Received */
        ret_val = e1000_read_emi_reg_locked(hw, pcs_status, &data);
        if (ret_val)

diff --git a/drivers/net/e1000/base/e1000_ich8lan.h b/drivers/net/e1000/base/e1000_ich8lan.h
index 97da6bf..f5d8ab1 100644 (file)
--- a/drivers/net/e1000/base/e1000_ich8lan.h
+++ b/drivers/net/e1000/base/e1000_ich8lan.h
@@ -261,12 +261,14 @@ POSSIBILITY OF SUCH DAMAGE.
 #define I82577_MSE_THRESHOLD   0x0887 /* 82577 Mean Square Error Threshold */
 #define I82579_MSE_LINK_DOWN   0x2411 /* MSE count before dropping link */
 #define I82579_RX_CONFIG               0x3412 /* Receive configuration */
+#define I82579_LPI_PLL_SHUT            0x4412 /* LPI PLL Shut Enable */
 #define I82579_EEE_PCS_STATUS          0x182E  /* IEEE MMD Register 3.1 >> 8 */
 #define I82579_EEE_CAPABILITY          0x0410 /* IEEE MMD Register 3.20 */
 #define I82579_EEE_ADVERTISEMENT       0x040E /* IEEE MMD Register 7.60 */
 #define I82579_EEE_LP_ABILITY          0x040F /* IEEE MMD Register 7.61 */
 #define I82579_EEE_100_SUPPORTED       (1 << 1) /* 100BaseTx EEE */
 #define I82579_EEE_1000_SUPPORTED      (1 << 2) /* 1000BaseTx EEE */
+#define I82579_LPI_100_PLL_SHUT        (1 << 2) /* 100M LPI PLL Shut Enabled */
 #define I217_EEE_PCS_STATUS    0x9401   /* IEEE MMD Register 3.1 */
 #define I217_EEE_CAPABILITY    0x8000   /* IEEE MMD Register 3.20 */
 #define I217_EEE_ADVERTISEMENT 0x8001   /* IEEE MMD Register 7.60 */