e1000e: do not write SmartSpeed register bits on parts without support

The driver was accessing register bits for features on parts that do
not support that feature.  This could cause problems in the hardware.

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>

diff --git a/drivers/net/e1000e/ich8lan.c b/drivers/net/e1000e/ich8lan.c
index 438778fef5acc823810d527ff31dfe2e0e3b1cf7..bf9b97db76b965ea05948c147c1345b1959df214 100644 (file)
--- a/drivers/net/e1000e/ich8lan.c
+++ b/drivers/net/e1000e/ich8lan.c
@@ -977,12 +977,14 @@ static s32 e1000_set_d0_lplu_state_ich8lan(struct e1000_hw *hw, bool active)
                phy_ctrl |= E1000_PHY_CTRL_D0A_LPLU;
                ew32(PHY_CTRL, phy_ctrl);
 
+               if (phy->type != e1000_phy_igp_3)
+                       return 0;
+
                /*
                 * Call gig speed drop workaround on LPLU before accessing
                 * any PHY registers
                 */
-               if ((hw->mac.type == e1000_ich8lan) &&
-                   (hw->phy.type == e1000_phy_igp_3))
+               if (hw->mac.type == e1000_ich8lan)
                        e1000e_gig_downshift_workaround_ich8lan(hw);
 
                /* When LPLU is enabled, we should disable SmartSpeed */
@@ -995,6 +997,9 @@ static s32 e1000_set_d0_lplu_state_ich8lan(struct e1000_hw *hw, bool active)
                phy_ctrl &= ~E1000_PHY_CTRL_D0A_LPLU;
                ew32(PHY_CTRL, phy_ctrl);
 
+               if (phy->type != e1000_phy_igp_3)
+                       return 0;
+
                /*
                 * LPLU and SmartSpeed are mutually exclusive.  LPLU is used
                 * during Dx states where the power conservation is most
@@ -1054,6 +1059,10 @@ static s32 e1000_set_d3_lplu_state_ich8lan(struct e1000_hw *hw, bool active)
        if (!active) {
                phy_ctrl &= ~E1000_PHY_CTRL_NOND0A_LPLU;
                ew32(PHY_CTRL, phy_ctrl);
+
+               if (phy->type != e1000_phy_igp_3)
+                       return 0;
+
                /*
                 * LPLU and SmartSpeed are mutually exclusive.  LPLU is used
                 * during Dx states where the power conservation is most
@@ -1089,12 +1098,14 @@ static s32 e1000_set_d3_lplu_state_ich8lan(struct e1000_hw *hw, bool active)
                phy_ctrl |= E1000_PHY_CTRL_NOND0A_LPLU;
                ew32(PHY_CTRL, phy_ctrl);
 
+               if (phy->type != e1000_phy_igp_3)
+                       return 0;
+
                /*
                 * Call gig speed drop workaround on LPLU before accessing
                 * any PHY registers
                 */
-               if ((hw->mac.type == e1000_ich8lan) &&
-                   (hw->phy.type == e1000_phy_igp_3))
+               if (hw->mac.type == e1000_ich8lan)
                        e1000e_gig_downshift_workaround_ich8lan(hw);
 
                /* When LPLU is enabled, we should disable SmartSpeed */