[PATCH] firmware: qcom_tee_uefisecapp: register at subsys init

[Johan Hovold]

Register efivars at subsys init time so that it is available when
efivarfs probes. For the same reason, also prevent building the driver
as a module.

This is specifically needed on platforms such as the Lenovo Thinkpad
X13s where the firmware has cleared the variable services in the RT_PROP
table so that efi core does not register any efivar callbacks at subsys
init time (which are later overridden).

Signed-off-by: Johan Hovold <johan+linaro@xxxxxxxxxx>
---
 drivers/firmware/Kconfig               | 2 +-
 drivers/firmware/qcom_tee_uefisecapp.c | 7 ++++++-
 2 files changed, 7 insertions(+), 2 deletions(-)

diff --git a/drivers/firmware/Kconfig b/drivers/firmware/Kconfig
index 4e9e2c227899..48e712e363da 100644
--- a/drivers/firmware/Kconfig
+++ b/drivers/firmware/Kconfig
@@ -231,7 +231,7 @@ config QCOM_TEE
 	select QCOM_SCM
 
 config QCOM_TEE_UEFISECAPP
-	tristate "Qualcomm TrEE UEFI Secure App client driver"
+	bool "Qualcomm TrEE UEFI Secure App client driver"
 	select QCOM_TEE
 	depends on EFI
 	help
diff --git a/drivers/firmware/qcom_tee_uefisecapp.c b/drivers/firmware/qcom_tee_uefisecapp.c
index 65573e4b815a..e83bce4da70a 100644
--- a/drivers/firmware/qcom_tee_uefisecapp.c
+++ b/drivers/firmware/qcom_tee_uefisecapp.c
@@ -754,7 +754,12 @@ static struct platform_driver qcom_uefisecapp_driver = {
 		.probe_type = PROBE_PREFER_ASYNCHRONOUS,
 	},
 };
-module_platform_driver(qcom_uefisecapp_driver);
+
+static int __init qcom_uefisecapp_init(void)
+{
+	return platform_driver_register(&qcom_uefisecapp_driver);
+}
+subsys_initcall(qcom_uefisecapp_init);
 
 MODULE_AUTHOR("Maximilian Luz <luzmaximilian@xxxxxxxxx>");
 MODULE_DESCRIPTION("Client driver for Qualcomm TrEE/TZ UEFI Secure App");
-- 
2.38.2