e1000e: Enable GPT clock before sending message to CSME

On corporate (CSME) ADL systems, the Ethernet Controller may stop working ("HW unit hang") after exiting from the s0ix state. The reason is that CSME misses the message sent by the host. Enabling the dynamic GPT clock solves this problem. This clock is cleared upon HW initialization. Fixes: 3e55d23 ("e1000e: Add handshake with the CSME to support S0ix") Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=214821 Reviewed-by: Dima Ruinskiy <[email protected]> Signed-off-by: Sasha Neftin <[email protected]> Tested-by: Chia-Lin Kao (AceLan) <[email protected]> Tested-by: Naama Meir <[email protected]> Signed-off-by: Tony Nguyen <[email protected]>
niw · Jul 14, 2022 · b49feac · b49feac
1 parent cd72e61
commit b49feac
Showing 1 changed file with 4 additions and 0 deletions.
diff --git a/drivers/net/ethernet/intel/e1000e/netdev.c b/drivers/net/ethernet/intel/e1000e/netdev.c
@@ -6494,6 +6494,10 @@ static void e1000e_s0ix_exit_flow(struct e1000_adapter *adapter)
 
 	if (er32(FWSM) & E1000_ICH_FWSM_FW_VALID &&
 	    hw->mac.type >= e1000_pch_adp) {
+		/* Keep the GPT clock enabled for CSME */
+		mac_data = er32(FEXTNVM);
+		mac_data |= BIT(3);
+		ew32(FEXTNVM, mac_data);
 		/* Request ME unconfigure the device from S0ix */
 		mac_data = er32(H2ME);
 		mac_data &= ~E1000_H2ME_START_DPG;