[PATCH 2/2] firmware: arm_scmi: optee: use optee system invocation

[Etienne Carriere]

Changes SCMI optee transport to enable sys_service capability of
its tee context to leverage provisioned system resources in OP-TEE
preventing possible deadlock.

Such deadlock could happen when many Linux clients invoke OP-TEE are
are all suspended waiting for an OP-TEE RPC request access an SCMI
resource through the SCMI OP-TEE PTA service.

Signed-off-by: Etienne Carriere <etienne.carriere@xxxxxxxxxx>
---
 drivers/firmware/arm_scmi/optee.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/firmware/arm_scmi/optee.c b/drivers/firmware/arm_scmi/optee.c
index 2a7aeab40e54..91840345e946 100644
--- a/drivers/firmware/arm_scmi/optee.c
+++ b/drivers/firmware/arm_scmi/optee.c
@@ -559,6 +559,9 @@ static int scmi_optee_service_probe(struct device *dev)
 	if (IS_ERR(tee_ctx))
 		return -ENODEV;
 
+	/* SCMI agent can used TEE system service resources */
+	tee_ctx->sys_service = true;
+
 	agent = devm_kzalloc(dev, sizeof(*agent), GFP_KERNEL);
 	if (!agent) {
 		ret = -ENOMEM;
-- 
2.25.1