Commit bfd546a552e1 ("e1000e: move force SMBUS near the end of
enable_ulp function") fixed an issue with loss of PHY access during
suspend on Meteor Lake systems. However, it introduced a regression
on older devices, such as [8086:15B8], [8086:15F9], [8086:15BE].
This patch aims to fix the secondary regression, by limiting the scope
of the changes in that commit to Meteor Lake platforms only.
Fixes: bfd546a552e1 ("e1000e: move force SMBUS near the end of enable_ulp
function")
Signed-off-by: Vitaly Lifshits <vitaly.lifsh...@intel.com>
Link: https://bugzilla.kernel.org/show_bug.cgi?id=218940
---
drivers/net/ethernet/intel/e1000e/ich8lan.c | 68 +++++++++++++++------
1 file changed, 48 insertions(+), 20 deletions(-)
diff --git a/drivers/net/ethernet/intel/e1000e/ich8lan.c
b/drivers/net/ethernet/intel/e1000e/ich8lan.c
index 2e98a2a0bead..7b1da97e82bf 100644
--- a/drivers/net/ethernet/intel/e1000e/ich8lan.c
+++ b/drivers/net/ethernet/intel/e1000e/ich8lan.c
@@ -137,6 +137,7 @@ static void e1000_gate_hw_phy_config_ich8lan(struct
e1000_hw *hw, bool gate);
static s32 e1000_disable_ulp_lpt_lp(struct e1000_hw *hw, bool force);
static s32 e1000_setup_copper_link_pch_lpt(struct e1000_hw *hw);
static s32 e1000_oem_bits_config_ich8lan(struct e1000_hw *hw, bool d0_state);
+static s32 e1000e_force_smbus(struct e1000_hw *hw);
static inline u16 __er16flash(struct e1000_hw *hw, unsigned long reg)
{
@@ -1108,6 +1109,41 @@ static s32 e1000_platform_pm_pch_lpt(struct e1000_hw
*hw, bool link)
return 0;
}
+/**
+ * e1000e_force_smbus
+ * @hw: pointer to the HW structure
+ *
+ * Force the MAC and the PHY to SMBUS mode.
+ **/
+static s32 e1000e_force_smbus(struct e1000_hw *hw)
+{
+ u16 smb_ctrl = 0;
+ u32 ctrl_ext = 0;
+ s32 ret_val = 0;
+
+ /* Switching PHY interface always returns MDI error
+ * so disable retry mechanism to avoid wasting time
+ */
+ e1000e_disable_phy_retry(hw);
+
+ /* Force SMBus mode in the PHY */
+ ret_val = e1000_read_phy_reg_hv_locked(hw, CV_SMB_CTRL, &smb_ctrl);
+ if (ret_val)
+ return ret_val;
+
+ smb_ctrl |= CV_SMB_CTRL_FORCE_SMBUS;
+ e1000_write_phy_reg_hv_locked(hw, CV_SMB_CTRL, smb_ctrl);
+
+ e1000e_enable_phy_retry(hw);
+
+ /* Force SMBus mode in the MAC */
+ ctrl_ext = er32(CTRL_EXT);
+ ctrl_ext |= E1000_CTRL_EXT_FORCE_SMBUS;
+ ew32(CTRL_EXT, ctrl_ext);
+
+ return 0;
+}
+
/**
* e1000_enable_ulp_lpt_lp - configure Ultra Low Power mode for LynxPoint-LP
* @hw: pointer to the HW structure
@@ -1165,6 +1201,14 @@ s32 e1000_enable_ulp_lpt_lp(struct e1000_hw *hw, bool
to_sx)
if (ret_val)
goto out;
+ if (hw->mac.type != e1000_pch_mtp) {
+ ret_val = e1000e_force_smbus(hw);
+ if (ret_val) {
+ e_dbg("Failed to force SMBUS: %d\n", ret_val);
+ goto out;
+ }
+ }
+
/* Si workaround for ULP entry flow on i127/rev6 h/w. Enable
* LPLU and disable Gig speed when entering ULP
*/
@@ -1225,27 +1269,11 @@ s32 e1000_enable_ulp_lpt_lp(struct e1000_hw *hw, bool
to_sx)
}
release:
- /* Switching PHY interface always returns MDI error
- * so disable retry mechanism to avoid wasting time
- */
- e1000e_disable_phy_retry(hw);
-
- /* Force SMBus mode in PHY */
- ret_val = e1000_read_phy_reg_hv_locked(hw, CV_SMB_CTRL, &phy_reg);
- if (ret_val) {
- e1000e_enable_phy_retry(hw);
- hw->phy.ops.release(hw);
- goto out;
+ if (hw->mac.type == e1000_pch_mtp) {
+ ret_val = e1000e_force_smbus(hw);
+ if (ret_val)
+ e_dbg("Failed to force SMBUS: %d\n", ret_val);
}
- phy_reg |= CV_SMB_CTRL_FORCE_SMBUS;
- e1000_write_phy_reg_hv_locked(hw, CV_SMB_CTRL, phy_reg);
-
- e1000e_enable_phy_retry(hw);
-
- /* Force SMBus mode in MAC */
- mac_reg = er32(CTRL_EXT);
- mac_reg |= E1000_CTRL_EXT_FORCE_SMBUS;
- ew32(CTRL_EXT, mac_reg);
hw->phy.ops.release(hw);
out:
--
2.34.1
