Change in coreboot[master]: soc/intel/skylake: Do a heci_reset before reading ME firmware version

[Furquan Shaikh (Code Review)]

Furquan Shaikh has uploaded this change for review. ( https://review.coreboot.org/25362

Change subject: soc/intel/skylake: Do a heci_reset before reading ME firmware version
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soc/intel/skylake: Do a heci_reset before reading ME firmware version

This change adds a call to heci_reset before attempting to read
ME firmware version. This is important to ensure that both ME and BIOS
are in sync.

BUG=b:76167737
BRANCH=poppy
TEST=Verfied that ME firmware version read does not fail on first boot
after power failure (i.e. removing battery and AC power).

Change-Id: Ib6b39c398d2e1177b087352a4acb8bcf5a9897d6
Signed-off-by: Furquan Shaikh 
---
M src/soc/intel/skylake/me.c
1 file changed, 6 insertions(+), 0 deletions(-)

git pull ssh://review.coreboot.org:29418/coreboot refs/changes/62/25362/1

diff --git a/src/soc/intel/skylake/me.c b/src/soc/intel/skylake/me.c
index 67d7bc0..9a721bc 100644
--- a/src/soc/intel/skylake/me.c
+++ b/src/soc/intel/skylake/me.c
@@ -254,6 +254,12 @@
        (hfs.fields.operation_mode != ME_HFS_MODE_NORMAL))
    	goto failed;

+	/*
+	 * It is important to do a heci_reset to ensure BIOS and ME are in sync
+	 * before reading firmware version.
+	 */
+	heci_reset();
+
    if (!heci_send(&fw_ver_msg, sizeof(fw_ver_msg), BIOS_HOST_ADD,
    	       HECI_MKHI_ADD))
    	goto failed;