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Subject[PATCH 2/2] firmware: arm_scmi: optee: use optee system invocation
Date
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@linaro.org>
---
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
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