tree dbe4d331c0189872021ff637c71fb380232d7816
parent a219edb409929bb5718b102b1a33c49d503d314d
author Subrata Banik <subrata.banik@intel.com> 1632563772 +0530
committer Subrata Banik <subrata.banik@intel.com> 1632983269 +0000

soc/intel/common/../cse: Perform D0I3 bit reset/set prior sending EOP

Prior to coreboot sending EOP messages during post, it's important to
ensure that CSE is not in Idle state. In case CSE is in Dev Idle
state (which means D0I3 bit is set), reset this bit before sending
EOP command.

This patch ensures coreboot has provision to send CSE EOP messages even
after the FSP Notify phase without any delays waiting for the device
to respond or timeout.

BUG=b:200644229
TEST=Able to send CSE EOP message even after FSP Notify phase.

Attempting CSE EOP msg sending post FSP notify without this code change
causes `timeout` issue as below:

BS: BS_PAYLOAD_LOAD exit times (exec / console): 171 / 0 ms
Finalizing chipset.
apm_control: Finalizing SMM.
APMC done.
HECI: Sending End-of-Post
HECI: timed out reading answer!
HECI: Failed to receive!
HECI: receive Failed
HECI: EOP send/receive fail
ERROR: Failed to send EOP to CSE, 2
cse: CSE status registers: HFSTS1: 0x90000255, HFSTS2: 0xf10516 HFSTS3:
0x20
VB2:vb2api_fail() Need recovery, reason: 0x31 / 0xc
Saving nvdata
board_reset() called!
full_reset() called!

Attempting CSE EOP msg sending post FSP notify with this code change
is `successful` as below:

BS: BS_PAYLOAD_LOAD exit times (exec / console): 170 / 0 ms
Finalizing chipset.
apm_control: Finalizing SMM.
APMC done.
HECI: Sending End-of-Post
CSE: EOP requested action: continue boot
CSE EOP successful, continuing boot

Change-Id: Iae1bc52e94b08f97004424ea0c147d6da8aca6e2
Signed-off-by: Subrata Banik <subrata.banik@intel.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/57805
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Maulik V Vaghela <maulik.v.vaghela@intel.com>
Reviewed-by: Tim Wawrzynczak <twawrzynczak@chromium.org>