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.
Acked-by: Sudeep Holla <[email protected]>
Signed-off-by: Etienne Carriere <[email protected]>
---
No change since v6
Changes since v5:
- Applied Sudeep's review tag
Changes since v4:
- Updated to new API function tee_client_system_session() introduced
in patch v5 2/3.
No change since v3
Changes since v2:
- Fixed syntax issues (missing ';' chars), reported by kernel test robot.
Changes since v1:
- Updated to use new tee API functions tee_client_request_system_context()
and tee_client_release_system_context().
---
drivers/firmware/arm_scmi/optee.c | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/drivers/firmware/arm_scmi/optee.c b/drivers/firmware/arm_scmi/optee.c
index e123de6e8c67..25bfb465484d 100644
--- 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;
--
2.25.1