From 99a190105fc280f4935f8eb2d377b02d8f19128e Mon Sep 17 00:00:00 2001
From: Seunghwan Kim <sh_.kim@samsung.corp-partner.google.com>
Date: Mon, 10 Jun 2024 17:29:49 +0900
Subject: mb/google/brya/var/xol: Turn off camera power during s0ix

Turn off camera power during s0ix to improve power consumption.

BUG=None
BRANCH=brya
TEST=built and verified GPP_A17 went to low during s0ix with a scope.

[Measurement of s0ix power consumption - 1 hour avg]
 Before this: 301.4 mW
 After this: 299.8 mW

Change-Id: Iae02d06e9f5a5988563b2b7ae36d153aecedb9d7
Signed-off-by: Seunghwan Kim <sh_.kim@samsung.corp-partner.google.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/83029
Reviewed-by: Eric Lai <ericllai@google.com>
Reviewed-by: Subrata Banik <subratabanik@google.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: YH Lin <yueherngl@google.com>
---
 src/mainboard/google/brya/variants/xol/include/variant/gpio.h |  2 ++
 src/mainboard/google/brya/variants/xol/variant.c              | 11 +++++++++++
 2 files changed, 13 insertions(+)

(limited to 'src/mainboard')

diff --git a/src/mainboard/google/brya/variants/xol/include/variant/gpio.h b/src/mainboard/google/brya/variants/xol/include/variant/gpio.h
index c4fe342621..f62197dfe6 100644
--- a/src/mainboard/google/brya/variants/xol/include/variant/gpio.h
+++ b/src/mainboard/google/brya/variants/xol/include/variant/gpio.h
@@ -5,4 +5,6 @@
 
 #include <baseboard/gpio.h>
 
+#define CAM_PWR GPP_A17
+
 #endif
diff --git a/src/mainboard/google/brya/variants/xol/variant.c b/src/mainboard/google/brya/variants/xol/variant.c
index 26ced214d4..8d14715a67 100644
--- a/src/mainboard/google/brya/variants/xol/variant.c
+++ b/src/mainboard/google/brya/variants/xol/variant.c
@@ -1,6 +1,8 @@
 /* SPDX-License-Identifier: GPL-2.0-only */
 
+#include <acpi/acpigen.h>
 #include <baseboard/variants.h>
+#include <variant/gpio.h>
 #include <chip.h>
 #include <fw_config.h>
 #include <sar.h>
@@ -9,3 +11,12 @@ const char *get_wifi_sar_cbfs_filename(void)
 {
 	return "wifi_sar_0.hex";
 }
+
+void variant_generate_s0ix_hook(enum s0ix_entry entry)
+{
+	/* Add board-specific MS0X entries */
+	if (entry == S0IX_ENTRY)
+		acpigen_soc_clear_tx_gpio(CAM_PWR);
+	if (entry == S0IX_EXIT)
+		acpigen_soc_set_tx_gpio(CAM_PWR);
+}
-- 
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