e1000e: enable support for EEE on 82579
This patch enables IEEE802.3az (a.k.a. Energy Efficient Ethernet) on the
new 82579 LOMs. An optional module parameter is provided to disable the
feature if desired.
Signed-off-by: Bruce Allan <bruce.w.allan@intel.com>
Tested-by: Jeff Pieper <jeffrey.e.pieper@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/drivers/net/e1000e/ich8lan.c b/drivers/net/e1000e/ich8lan.c
index 8274499..5e55de0 100644
--- a/drivers/net/e1000e/ich8lan.c
+++ b/drivers/net/e1000e/ich8lan.c
@@ -131,6 +131,10 @@
/* PHY Power Management Control */
#define HV_PM_CTRL PHY_REG(770, 17)
+/* PHY Low Power Idle Control */
+#define I82579_LPI_CTRL PHY_REG(772, 20)
+#define I82579_LPI_CTRL_ENABLE_MASK 0x6000
+
/* Strapping Option Register - RO */
#define E1000_STRAP 0x0000C
#define E1000_STRAP_SMBUS_ADDRESS_MASK 0x00FE0000
@@ -569,6 +573,35 @@
}
/**
+ * e1000_set_eee_pchlan - Enable/disable EEE support
+ * @hw: pointer to the HW structure
+ *
+ * Enable/disable EEE based on setting in dev_spec structure. The bits in
+ * the LPI Control register will remain set only if/when link is up.
+ **/
+static s32 e1000_set_eee_pchlan(struct e1000_hw *hw)
+{
+ s32 ret_val = 0;
+ u16 phy_reg;
+
+ if (hw->phy.type != e1000_phy_82579)
+ goto out;
+
+ ret_val = e1e_rphy(hw, I82579_LPI_CTRL, &phy_reg);
+ if (ret_val)
+ goto out;
+
+ if (hw->dev_spec.ich8lan.eee_disable)
+ phy_reg &= ~I82579_LPI_CTRL_ENABLE_MASK;
+ else
+ phy_reg |= I82579_LPI_CTRL_ENABLE_MASK;
+
+ ret_val = e1e_wphy(hw, I82579_LPI_CTRL, phy_reg);
+out:
+ return ret_val;
+}
+
+/**
* e1000_check_for_copper_link_ich8lan - Check for link (Copper)
* @hw: pointer to the HW structure
*
@@ -625,6 +658,11 @@
*/
e1000e_check_downshift(hw);
+ /* Enable/Disable EEE after link up */
+ ret_val = e1000_set_eee_pchlan(hw);
+ if (ret_val)
+ goto out;
+
/*
* If we are forcing speed/duplex, then we simply return since
* we have already determined whether we have link or not.
@@ -3820,7 +3858,8 @@
| FLAG_HAS_FLASH
| FLAG_HAS_JUMBO_FRAMES
| FLAG_APME_IN_WUC,
- .flags2 = FLAG2_HAS_PHY_STATS,
+ .flags2 = FLAG2_HAS_PHY_STATS
+ | FLAG2_HAS_EEE,
.pba = 18,
.max_hw_frame_size = DEFAULT_JUMBO,
.get_variants = e1000_get_variants_ich8lan,