Change in coreboot[master]: soc/amd/cezanne: Add support for Modern Standby event logging

[Karthik Ramasubramanian (Code Review)]

Attention is currently required from: Jason Glenesk, Raul Rangel, Marshall Dawson, Felix Held.
Karthik Ramasubramanian has uploaded this change for review. ( https://review.coreboot.org/c/coreboot/+/56363 )

Change subject: soc/amd/cezanne: Add support for Modern Standby event logging
......................................................................

soc/amd/cezanne: Add support for Modern Standby event logging

Log the GPE and PM1 wake events into the event log using the SMI handler
platform callback.

BUG=b:186792595, b:186800045
TEST=Build and boot to OS in Guybrush. Ensure that the wake sources are
logged into the event logs.
5 | 2021-07-15 16:26:43 | S0ix Enter
6 | 2021-07-15 16:26:49 | S0ix Exit
7 | 2021-07-15 16:26:49 | Wake Source | GPE # | 22   <- Trackpad
8 | 2021-07-15 16:27:07 | S0ix Enter
9 | 2021-07-15 16:27:13 | S0ix Exit
10 | 2021-07-15 16:27:13 | Wake Source | RTC Alarm | 0
25 | 2021-07-15 16:38:13 | S0ix Enter
26 | 2021-07-15 16:38:17 | S0ix Exit
27 | 2021-07-15 16:38:17 | Wake Source | GPE # | 5 <- Fingerprint

Change-Id: Icec6fc03f4871cc46b32886575a7054bc289f4bf
Signed-off-by: Karthikeyan Ramasubramanian 
---
M src/soc/amd/cezanne/Makefile.inc
A src/soc/amd/cezanne/elog.c
2 files changed, 16 insertions(+), 0 deletions(-)

git pull ssh://review.coreboot.org:29418/coreboot refs/changes/63/56363/1

diff --git a/src/soc/amd/cezanne/Makefile.inc b/src/soc/amd/cezanne/Makefile.inc
index 478eecc..feb8c9d 100644
--- a/src/soc/amd/cezanne/Makefile.inc
+++ b/src/soc/amd/cezanne/Makefile.inc
@@ -50,6 +50,7 @@
 smm-y		+= gpio.c
 smm-y		+= smihandler.c
 smm-y		+= smu.c
+smm-y		+= elog.c
 smm-$(CONFIG_DEBUG_SMI) += uart.c

CPPFLAGS_common += -I$(src)/soc/amd/cezanne/include
diff --git a/src/soc/amd/cezanne/elog.c b/src/soc/amd/cezanne/elog.c
new file mode 100644
index 0000000..0e945e1
--- /dev/null
+++ b/src/soc/amd/cezanne/elog.c
@@ -0,0 +1,15 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+
+#include <amdblocks/acpi.h>
+#include <amdblocks/elog.h>
+#include <amdblocks/pmlib.h>
+#include <elog.h>
+
+void elog_gsmi_cb_platform_log_wake_source(void)
+{
+	struct chipset_power_state ps;
+
+	pm_fill_chipset_state(&ps);
+	elog_pm1_status(&ps.gpe_state);
+	elog_gpe_events(&ps.gpe_state);
+}