mb/google/fizz/variants/karma: Clear GPP_B4 when entering S5

Set GPP_B4 to low in S5 to meet touch panel power sequence

BUG=b:124197348
BRANCH=master
TEST=Verify GPP_B4 is low.

Change-Id: I65deb33a45fdc0c0ce64deaa29c2790029dc1d12
Signed-off-by: David Wu <David_Wu@quanta.corp-partner.google.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/29796
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Zhuohao Lee <zhuohao@chromium.org>
Reviewed-by: Patrick Georgi <pgeorgi@google.com>
Reviewed-by: David Wu <david_wu@quanta.corp-partner.google.com>
Reviewed-by: Furquan Shaikh <furquan@google.com>

src/mainboard/google/fizz/smihandler.c

@@ -17,6 +17,7 @@
 #include <ec/google/chromeec/smm.h>
 #include <soc/smm.h>
 
+#include <baseboard/variants.h>
 #include <variant/ec.h>
 
 void mainboard_smi_espi_handler(void)
@@ -24,8 +25,11 @@ void mainboard_smi_espi_handler(void)
 	chromeec_smi_process_events();
 }
 
+void __weak variant_smi_sleep(u8 slp_typ) {}
+
 void mainboard_smi_sleep(u8 slp_typ)
 {
+	variant_smi_sleep(slp_typ);
 	chromeec_smi_sleep(slp_typ, MAINBOARD_EC_S3_WAKE_EVENTS,
 			MAINBOARD_EC_S5_WAKE_EVENTS);
 }

src/mainboard/google/fizz/variants/baseboard/include/baseboard/variants.h

@@ -29,6 +29,8 @@ const struct pad_config *variant_early_gpio_table(size_t *num);
 
 const struct cros_gpio *variant_cros_gpios(size_t *num);
 
+void variant_smi_sleep(u8 slp_typ);
+
 struct nhlt;
 void variant_nhlt_init(struct nhlt *nhlt);
 void variant_nhlt_oem_overrides(const char **oem_id, const char **oem_table_id,

src/mainboard/google/fizz/variants/karma/Makefile.inc

@@ -2,3 +2,5 @@ bootblock-y += gpio.c
 
 ramstage-y += gpio.c
 ramstage-y += nhlt.c
+
+smm-$(CONFIG_HAVE_SMI_HANDLER) += smihandler.c

src/mainboard/google/fizz/variants/karma/smihandler.c

@@ -0,0 +1,28 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * Copyright (C) 2018 Google Inc.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; version 2 of the License.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#include <arch/acpi.h>
+#include <baseboard/variants.h>
+#include <gpio.h>
+
+#define TS_ENABLE	GPP_B4
+
+void variant_smi_sleep(u8 slp_typ)
+{
+	if (slp_typ == ACPI_S5) {
+		/* Set TS to disable */
+		gpio_set(TS_ENABLE, 0);
+	}
+}