drivers/tpm: Add firmware-power-managed DSD property

Introduce firmware-power-managed DSD ACPI property for TPM devices.
This property can be checked by the kernel TPM driver to override how
the TPM power states are managed. This is a tri-state flag, true,
false, or unset. So an enum used to keep the flag is unset by default.

When firmware-power-managed is true, the kernel driver will not send a
shutdown during s2idle/s0i3 suspend.

BUG=b:200578885
BRANCH=None
TEST=TPM shutdown is triggered on s0ix suspend on guybrush with patched
kernel

Change-Id: Ia48ead856fc0c6e637a2e07a5ecc58423f599c5b
Signed-off-by: Rob Barnes <robbarnes@google.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/59479
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Raul Rangel <rrangel@chromium.org>

1 files changed, 7 insertions, 0 deletions

diff --git a/src/drivers/i2c/tpm/chip.h b/src/drivers/i2c/tpm/chip.h
index 0ab10d7560..4eac7e16f4 100644
--- a/src/drivers/i2c/tpm/chip.h
+++ b/src/drivers/i2c/tpm/chip.h
@@ -3,6 +3,12 @@
 #include <acpi/acpi_device.h>
 #include <device/i2c_simple.h>
 
+enum tpm_power_managed_mode {
+	TPM_DEFAULT_POWER_MANAGED = 0,
+	TPM_FIRMWARE_POWER_MANAGED,
+	TPM_KERNEL_POWER_MANAGED,
+};
+
 struct drivers_i2c_tpm_config {
 	const char *hid;	/* ACPI _HID (required) */
 	const char *desc;	/* Device Description */
@@ -10,4 +16,5 @@ struct drivers_i2c_tpm_config {
 	enum i2c_speed speed;	/* Bus speed in Hz, default is I2C_SPEED_FAST */
 	struct acpi_irq irq;	/* Interrupt */
 	struct acpi_gpio irq_gpio;	/* GPIO interrupt */
+	enum tpm_power_managed_mode power_managed_mode;	/* TPM power managed mode */
 };