netdev - [PATCH net 1/1] e1000e: Check the PCIm state

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Message-Id: <20210624190248.1213590-1-anthony.l.nguyen@intel.com>
Date:   Thu, 24 Jun 2021 12:02:48 -0700
From:   Tony Nguyen <anthony.l.nguyen@...el.com>
To:     davem@...emloft.net, kuba@...nel.org
Cc:     Sasha Neftin <sasha.neftin@...el.com>, netdev@...r.kernel.org,
        anthony.l.nguyen@...el.com, vitaly.lifshits@...el.com,
        Dvora Fuxbrumer <dvorax.fuxbrumer@...ux.intel.com>
Subject: [PATCH net 1/1] e1000e: Check the PCIm state

From: Sasha Neftin <sasha.neftin@...el.com>

Complete to commit def4ec6dce393e ("e1000e: PCIm function state support")
Check the PCIm state only on CSME systems. There is no point to do this
check on non CSME systems.
This patch fixes a generation a false-positive warning:
"Error in exiting dmoff"

Fixes: def4ec6dce39 ("e1000e: PCIm function state support")
Signed-off-by: Sasha Neftin <sasha.neftin@...el.com>
Tested-by: Dvora Fuxbrumer <dvorax.fuxbrumer@...ux.intel.com>
Signed-off-by: Tony Nguyen <anthony.l.nguyen@...el.com>
---
 drivers/net/ethernet/intel/e1000e/netdev.c | 24 ++++++++++++----------
 1 file changed, 13 insertions(+), 11 deletions(-)

diff --git a/drivers/net/ethernet/intel/e1000e/netdev.c b/drivers/net/ethernet/intel/e1000e/netdev.c
index 88e9035b75cf..dc0ded7e5e61 100644
--- a/drivers/net/ethernet/intel/e1000e/netdev.c
+++ b/drivers/net/ethernet/intel/e1000e/netdev.c
@@ -5223,18 +5223,20 @@ static void e1000_watchdog_task(struct work_struct *work)
 			pm_runtime_resume(netdev->dev.parent);
 
 			/* Checking if MAC is in DMoff state*/
-			pcim_state = er32(STATUS);
-			while (pcim_state & E1000_STATUS_PCIM_STATE) {
-				if (tries++ == dmoff_exit_timeout) {
-					e_dbg("Error in exiting dmoff\n");
-					break;
-				}
-				usleep_range(10000, 20000);
+			if (er32(FWSM) & E1000_ICH_FWSM_FW_VALID) {
 				pcim_state = er32(STATUS);
-
-				/* Checking if MAC exited DMoff state */
-				if (!(pcim_state & E1000_STATUS_PCIM_STATE))
-					e1000_phy_hw_reset(&adapter->hw);
+				while (pcim_state & E1000_STATUS_PCIM_STATE) {
+					if (tries++ == dmoff_exit_timeout) {
+						e_dbg("Error in exiting dmoff\n");
+						break;
+					}
+					usleep_range(10000, 20000);
+					pcim_state = er32(STATUS);
+
+					/* Checking if MAC exited DMoff state */
+					if (!(pcim_state & E1000_STATUS_PCIM_STATE))
+						e1000_phy_hw_reset(&adapter->hw);
+				}
 			}
 
 			/* update snapshot of PHY registers on LSC */
-- 
2.26.2