Messages in this thread |  | | From | Tzung-Bi Shih <> | Subject | [RESEND PATCH 00/11] platform/chrome: Kunit tests and refactor for cros_ec_cmd_xfer() | Date | Tue, 28 Jun 2022 02:49:02 +0000 |
| |
The first 5 patches add Kunit tests and refactors for cros_ec_cmd_xfer().
The last 6 patches change the behavior a bit by altering return codes.
Asynchronous mechanism in EC protocol: EC returns EC_RES_IN_PROGRESS if the host command needs more time to complete. It saves the result into `saved_result` once the command completed[1].
By design, AP should send another command EC_CMD_RESEND_RESPONSE for getting the result from the previous pending command[2]. The mechanism was only designed for commands that don't need responses[3].
However, the kernel code doesn't have such logic when dealing with EC_RES_IN_PROGRESS.
The series doesn't fix it but leave it as is. I doubt there is no existing use case.
[1]: https://crrev.com/9b80051e01872d8cae86fff999b5d31a0bea985b/common/host_command.c#113 [2]: https://crrev.com/9b80051e01872d8cae86fff999b5d31a0bea985b/common/host_command.c#748 [3]: https://crrev.com/9b80051e01872d8cae86fff999b5d31a0bea985b/common/host_command.c#126
Return value overridden in cros_ec_send_command() if asynchronous: By original intention, cros_ec_send_command() returns number of available bytes of input payload.
When it falls into asynchronous path (i.e. EC_RES_IN_PROGRESS), both return value and `msg->result` will be overridden by the subsequent EC_CMD_GET_COMMS_STATUS.
The series doesn't fix it but leave it as is.
Tzung-Bi Shih (11): platform/chrome: cros_ec_proto: add "cros_ec_" prefix to send_command() platform/chrome: cros_ec_proto: add Kunit tests for cros_ec_cmd_xfer() platform/chrome: cros_ec_proto: add Kunit tests for cros_ec_send_command() platform/chrome: cros_ec_proto: separate cros_ec_xfer_command() platform/chrome: cros_ec_proto: separate cros_ec_wait_until_complete() platform/chrome: cros_ec_proto: change Kunit expectation when timed out platform/chrome: cros_ec_proto: return -EAGAIN when retries timed out platform/chrome: cros_ec_proto: change Kunit expectation for EC errors platform/chrome: cros_ec_proto: return standard error codes for EC errors platform/chrome: cros_ec_proto: add Kunit test for empty payload platform/chrome: cros_ec_proto: return -EPROTO if empty payload
drivers/platform/chrome/cros_ec_proto.c | 106 +++-- drivers/platform/chrome/cros_ec_proto_test.c | 443 +++++++++++++++++++ drivers/platform/chrome/cros_kunit_util.c | 20 + drivers/platform/chrome/cros_kunit_util.h | 4 + 4 files changed, 527 insertions(+), 46 deletions(-)
-- 2.37.0.rc0.161.g10f37bed90-goog
|  |