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firmware: arm_scmi: optee: use optee system invocation

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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 <sudeep.holla@arm.com>
Cc: Cristian Marussi <cristian.marussi@arm.com>
Acked-by: Sudeep Holla <sudeep.holla@arm.com>
Reviewed-by: Sumit Garg <sumit.garg@linaro.org>
Signed-off-by: Etienne Carriere <etienne.carriere@foss.st.com>
Signed-off-by: Jens Wiklander <jens.wiklander@linaro.org>
This commit is contained in:
Etienne Carriere 2023-10-30 09:48:12 +01:00 committed by Jens Wiklander
parent 45bc2c9b5b
commit 4b391c9c37
1 changed files with 4 additions and 0 deletions
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4
drivers/firmware/arm_scmi/optee.c
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@ -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;