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.

Sasha Neftin committed 4 years ago

Commit b49feac1 parent cd72e611 file · +4 −0Browse files

Unified · Split

drivers/net/ethernet/intel/e1000e/netdev.c+4−0

@@ -6494,6 +6494,10 @@ static void e1000e_s0ix_exit_flow(struct e1000_adapter *adapter) · 6493 unmodified lines
6494	6494
6495	6495	if (er32(FWSM) & E1000_ICH_FWSM_FW_VALID &&
6496	6496	hw->mac.type >= e1000_pch_adp) {
	6497	+ /* Keep the GPT clock enabled for CSME */
	6498	+ mac_data = er32(FEXTNVM);
	6499	+ mac_data \|= BIT(3);
	6500	+ ew32(FEXTNVM, mac_data);
6497	6501	/* Request ME unconfigure the device from S0ix */
6498	6502	mac_data = er32(H2ME);
6499	6503	mac_data &= ~E1000_H2ME_START_DPG;