firmware: arm_scmi: optee: use optee system invocation

Changes SCMI optee transport to call tee_client_system_session() to request optee driver to provision an entry context in OP-TEE for processing OP-TEE messages. This prevents possible deadlock in case OP-TEE threads are all consumed while these may be waiting for a clock or regulator to be enable which SCMI OP-TEE service which requires a free thread context to execute. Cc: Sudeep Holla <[email protected]> Cc: Cristian Marussi <[email protected]> Acked-by: Sudeep Holla <[email protected]> Reviewed-by: Sumit Garg <[email protected]> Signed-off-by: Etienne Carriere <[email protected]> Signed-off-by: Jens Wiklander <[email protected]>
linaro-swg · Nov 3, 2023 · a24278e · a24278e
1 parent c5a3482
commit a24278e
Showing 1 changed file with 4 additions and 0 deletions.
diff --git a/drivers/firmware/arm_scmi/optee.c b/drivers/firmware/arm_scmi/optee.c
@@ -440,6 +440,10 @@ static int scmi_optee_chan_setup(struct scmi_chan_info *cinfo, struct device *de
 	if (ret)
 		goto err_free_shm;
 
+	ret = tee_client_system_session(scmi_optee_private->tee_ctx, channel->tee_session);
+	if (ret)
+		dev_warn(dev, "Could not switch to system session, do best effort\n");
+
 	ret = get_channel(channel);
 	if (ret)
 		goto err_close_sess;