From 47b7904d78ff2f0eb002edea99a3b761ccde962b Mon Sep 17 00:00:00 2001
From: Alan Huang <alan-huang@quanta.corp-partner.google.com>
Date: Tue, 29 Mar 2022 19:08:23 +0800
Subject: [PATCH] mb/google/brya/variants/baseboard/brask: Turn off NFC power
 in S0ix

Turn off the NFC power which is controlled by GPP_D3 to save power in
S0ix states. For an USB device, the S0ix hook is needed for the on/off
operations to take place.

BUG=b:202737385
BRANCH=firmware-brya-14505.B
TEST=measure the voltage of GPP_D3 in S0ix states

Signed-off-by: Alan Huang <alan-huang@quanta.corp-partner.google.com>
Change-Id: I69588c82dfde1744c45c7aff3ac05b80bb16a8f3
Reviewed-on: https://review.coreboot.org/c/coreboot/+/63191
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Eric Lai <eric_lai@quanta.corp-partner.google.com>
---
 .../google/brya/variants/brask/include/variant/gpio.h  |  2 ++
 src/mainboard/google/brya/variants/brask/variant.c     | 10 ++++++++++
 2 files changed, 12 insertions(+)

diff --git a/src/mainboard/google/brya/variants/brask/include/variant/gpio.h b/src/mainboard/google/brya/variants/brask/include/variant/gpio.h
index 27c87b3fe7..4c28cc90fb 100644
--- a/src/mainboard/google/brya/variants/brask/include/variant/gpio.h
+++ b/src/mainboard/google/brya/variants/brask/include/variant/gpio.h
@@ -5,4 +5,6 @@
 
 #include <baseboard/gpio.h>
 
+#define NFC_POWER	GPP_D3
+
 #endif /* __MAINBOARD_GPIO_H__ */
diff --git a/src/mainboard/google/brya/variants/brask/variant.c b/src/mainboard/google/brya/variants/brask/variant.c
index 04105db2ea..3f1796edb2 100644
--- a/src/mainboard/google/brya/variants/brask/variant.c
+++ b/src/mainboard/google/brya/variants/brask/variant.c
@@ -3,9 +3,19 @@
 #include <chip.h>
 #include <fw_config.h>
 #include <baseboard/variants.h>
+#include <variant/gpio.h>
+#include <acpi/acpigen.h>
 
 void variant_update_soc_chip_config(struct soc_intel_alderlake_config *config)
 {
 	config->cnvi_bt_audio_offload = fw_config_probe(FW_CONFIG(AUDIO,
 							NAU88L25B_I2S));
 }
+
+void variant_generate_s0ix_hook(enum s0ix_entry entry)
+{
+	if (entry == S0IX_ENTRY)
+		acpigen_soc_clear_tx_gpio(NFC_POWER);
+	else if (entry == S0IX_EXIT)
+		acpigen_soc_set_tx_gpio(NFC_POWER);
+}