On i.MX93 a0 the TRNG seems to be started automatically. On rev a1 it's
not and OP-TEE panics with "Cannot retrieve random data from ELE". Start
the TRNG to let OP-TEE startup successfully.
Signed-off-by: Sascha Hauer <s.hauer@xxxxxxxxxxxxxx>
---
arch/arm/mach-imx/ele.c | 20 ++++++++++++++++++++
1 file changed, 20 insertions(+)
diff --git a/arch/arm/mach-imx/ele.c b/arch/arm/mach-imx/ele.c
index ab3958cbd3..f8093fc694 100644
--- a/arch/arm/mach-imx/ele.c
+++ b/arch/arm/mach-imx/ele.c
@@ -165,6 +165,23 @@ int ele_get_info(struct ele_get_info_data *info)
return ret;
}
+static int ele_get_start_trng(void)
+{
+ struct ele_msg msg = {
+ .version = ELE_VERSION,
+ .tag = ELE_CMD_TAG,
+ .size = 1,
+ .command = ELE_START_RNG,
+ };
+ int ret;
+
+ ret = ele_call(&msg);
+ if (ret)
+ pr_err("Could not start TRNG, response 0x%x\n", msg.data[0]);
+
+ return ret;
+}
+
int imx93_ele_load_fw(void *bl33)
{
struct ele_get_info_data info = {};
@@ -204,6 +221,9 @@ int imx93_ele_load_fw(void *bl33)
pr_err("Could not start ELE firmware: ret %d, response 0x%x\n",
ret, msg.data[0]);
+ if (rev == 0xa1)
+ ele_get_start_trng();
+
return 0;
}
--
2.39.2
