From: Vitaly Lifshits <vitaly.lifshits@intel.com>
Date: Thu, 7 May 2020 20:14:06 +0300
Subject: e1000e: disable s0ix entry and exit flows for ME systems
Patch-mainline: v5.8-rc1
Git-commit: e086ba2fccda4c196b84a167493f67f089d0ebdc
References: jsc#SLE-13532

Since ME systems do not support SLP_S0 in S0ix state, and S0ix entry
and exit flows may cause errors on them it is best to avoid using
e1000e_s0ix_entry_flow and e1000e_s0ix_exit_flow functions.

This was done by creating a struct of all devices that comes with ME
and by checking if the current device has ME.

Signed-off-by: Vitaly Lifshits <vitaly.lifshits@intel.com>
Tested-by: Aaron Brown <aaron.f.brown@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
Acked-by: Thomas Bogendoerfer <tbogendoerfer@suse.de>
---
 drivers/net/ethernet/intel/e1000e/netdev.c |   45 +++++++++++++++++++++++++++--
 1 file changed, 43 insertions(+), 2 deletions(-)

--- a/drivers/net/ethernet/intel/e1000e/netdev.c
+++ b/drivers/net/ethernet/intel/e1000e/netdev.c
@@ -107,6 +107,45 @@ static const struct e1000_reg_info e1000
 	{0, NULL}
 };
 
+struct e1000e_me_supported {
+	u16 device_id;		/* supported device ID */
+};
+
+static const struct e1000e_me_supported me_supported[] = {
+	{E1000_DEV_ID_PCH_LPT_I217_LM},
+	{E1000_DEV_ID_PCH_LPTLP_I218_LM},
+	{E1000_DEV_ID_PCH_I218_LM2},
+	{E1000_DEV_ID_PCH_I218_LM3},
+	{E1000_DEV_ID_PCH_SPT_I219_LM},
+	{E1000_DEV_ID_PCH_SPT_I219_LM2},
+	{E1000_DEV_ID_PCH_LBG_I219_LM3},
+	{E1000_DEV_ID_PCH_SPT_I219_LM4},
+	{E1000_DEV_ID_PCH_SPT_I219_LM5},
+	{E1000_DEV_ID_PCH_CNP_I219_LM6},
+	{E1000_DEV_ID_PCH_CNP_I219_LM7},
+	{E1000_DEV_ID_PCH_ICP_I219_LM8},
+	{E1000_DEV_ID_PCH_ICP_I219_LM9},
+	{E1000_DEV_ID_PCH_CMP_I219_LM10},
+	{E1000_DEV_ID_PCH_CMP_I219_LM11},
+	{E1000_DEV_ID_PCH_CMP_I219_LM12},
+	{E1000_DEV_ID_PCH_TGP_I219_LM13},
+	{E1000_DEV_ID_PCH_TGP_I219_LM14},
+	{E1000_DEV_ID_PCH_TGP_I219_LM15},
+	{0}
+};
+
+static bool e1000e_check_me(u16 device_id)
+{
+	struct e1000e_me_supported *id;
+
+	for (id = (struct e1000e_me_supported *)me_supported;
+	     id->device_id; id++)
+		if (device_id == id->device_id)
+			return true;
+
+	return false;
+}
+
 /**
  * __ew32_prepare - prepare to write to MAC CSR register on certain parts
  * @hw: pointer to the HW structure
@@ -6917,7 +6956,8 @@ static int e1000e_pm_suspend(struct devi
 		e1000e_pm_thaw(dev);
 
 	/* Introduce S0ix implementation */
-	if (hw->mac.type >= e1000_pch_cnp)
+	if (hw->mac.type >= e1000_pch_cnp &&
+	    !e1000e_check_me(hw->adapter->pdev->device))
 		e1000e_s0ix_entry_flow(adapter);
 
 	return rc;
@@ -6932,7 +6972,8 @@ static int e1000e_pm_resume(struct devic
 	int rc;
 
 	/* Introduce S0ix implementation */
-	if (hw->mac.type >= e1000_pch_cnp)
+	if (hw->mac.type >= e1000_pch_cnp &&
+	    !e1000e_check_me(hw->adapter->pdev->device))
 		e1000e_s0ix_exit_flow(adapter);
 
 	rc = __e1000_resume(pdev);