ACPI: Add usb_charge_mode_from_gnvs()

Early Chromebook generations stored the information about
USB port power control for S3/S5 sleepstates in GNVS, although
the configuration is static.

Reduce code duplication and react to ACPI S4 as if it was ACPI
S5 request.

Change-Id: I7e6f37a023b0e9317dcf0355dfa70e28d51cdad9
Signed-off-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/74524
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Matt DeVillier <matt.devillier@gmail.com>

src/ec/google/chromeec/smihandler.c

@@ -1,6 +1,7 @@
 /* SPDX-License-Identifier: GPL-2.0-only */
 
 #include <acpi/acpi.h>
+#include <acpi/acpi_gnvs.h>
 #include <console/console.h>
 #include <cpu/x86/smm.h>
 #include <ec/google/chromeec/ec.h>
@@ -45,6 +46,19 @@ static void clear_pending_events(void)
 		;
 }
 
+void chromeec_set_usb_charge_mode(int slp_type)
+{
+	bool usb0_disable = 0, usb1_disable = 0;
+
+	usb_charge_mode_from_gnvs(slp_type, &usb0_disable, &usb1_disable);
+
+	if (usb0_disable)
+		google_chromeec_set_usb_charge_mode(0, USB_CHARGE_MODE_DISABLED);
+
+	if (usb1_disable)
+		google_chromeec_set_usb_charge_mode(1, USB_CHARGE_MODE_DISABLED);
+}
+
 void chromeec_smi_sleep(int slp_type, uint64_t s3_mask, uint64_t s5_mask)
 {
 	if (!google_chromeec_is_uhepi_supported()) {

src/ec/google/chromeec/smm.h

@@ -8,6 +8,8 @@
 /* Process all events from the EC when EC triggered an SMI#. */
 void chromeec_smi_process_events(void);
 
+void chromeec_set_usb_charge_mode(int slp_type);
+
 /*
  * Set wake masks according to sleep type, clear SCI and SMI masks,
  * and clear any pending events.