drivers: stm32_rng: use default PRNG init if RNG is disabled in the DT

In case RNG peripheral is not enabled in device tree, fallback to the default RNG initialization implementation. Signed-off-by: Thomas Bourgoin <[email protected]> Acked-by: Jens Wiklander <[email protected]> Acked-by: Jerome Forissier <[email protected]> Reviewed-by: Etienne Carriere <[email protected]>
OP-TEE · Sep 23, 2024 · f2fe4f0 · f2fe4f0
1 parent dcb51b2
commit f2fe4f0
Showing 1 changed file with 7 additions and 1 deletion.
diff --git a/core/drivers/stm32_rng.c b/core/drivers/stm32_rng.c
@@ -428,11 +428,17 @@ static TEE_Result stm32_rng_read(uint8_t *out, size_t size)
 }
 
 #ifdef CFG_WITH_SOFTWARE_PRNG
-/* Override weak plat_rng_init with platform handler to seed PRNG */
+/* Override weak plat_rng_init with platform handler to attempt to seed PRNG */
 void plat_rng_init(void)
 {
 	uint8_t seed[RNG_FIFO_BYTE_DEPTH] = { };
 
+	if (!stm32_rng) {
+		__plat_rng_init();
+		DMSG("PRNG seeded without RNG");
+		return;
+	}
+
 	if (stm32_rng_read(seed, sizeof(seed)))
 		panic();