[PATCH 05/11] platform/chrome: cros_ec_proto: separate cros_ec_wait_until_complete()

Tzung-Bi Shih
2022-06-15T05:13:37Z

EC returns EC_RES_IN_PROGRESS if the host command needs more time to
complete. Whenever receives the return code, cros_ec_send_command()
sends EC_CMD_GET_COMMS_STATUS to query the command status.

Separate cros_ec_wait_until_complete() from cros_ec_send_command().
It sends EC_CMD_GET_COMMS_STATUS and waits until the previous command
was completed, or encountered error, or timed out.

Signed-off-by: Tzung-Bi Shih <tzungbi@kernel.org>
---
drivers/platform/chrome/cros_ec_proto.c | 75 ++++++++++++-------------
1 file changed, 36 insertions(+), 39 deletions(-)

diff --git a/drivers/platform/chrome/cros_ec_proto.c b/drivers/platform/chrome/cros_ec_proto.c
index 0cec013be3d3..466ecb063bd6 100644
--- a/drivers/platform/chrome/cros_ec_proto.c
+++ b/drivers/platform/chrome/cros_ec_proto.c
@@ -134,53 +134,50 @@ static int cros_ec_xfer_command(struct cros_ec_device *ec_dev, struct cros_ec_co
return ret;
}

-static int cros_ec_send_command(struct cros_ec_device *ec_dev, struct cros_ec_command *msg)
+static int cros_ec_wait_until_complete(struct cros_ec_device *ec_dev, uint32_t *result)
{
- int ret = cros_ec_xfer_command(ec_dev, msg);
+ struct cros_ec_command *msg;
+ struct ec_response_get_comms_status *status;
+ int ret = 0, i;
+
+ msg = kzalloc(sizeof(*msg) + sizeof(*status), GFP_KERNEL);
+ if (!msg)
+ return -ENOMEM;

- if (msg->result == EC_RES_IN_PROGRESS) {
- int i;
- struct cros_ec_command *status_msg;
- struct ec_response_get_comms_status *status;
+ msg->command = EC_CMD_GET_COMMS_STATUS;
+ msg->insize = sizeof(*status);

- status_msg = kmalloc(sizeof(*status_msg) + sizeof(*status),
- GFP_KERNEL);
- if (!status_msg)
- return -ENOMEM;
+ status = (struct ec_response_get_comms_status *)msg->data;

- status_msg->version = 0;
- status_msg->command = EC_CMD_GET_COMMS_STATUS;
- status_msg->insize = sizeof(*status);
- status_msg->outsize = 0;
+ /* Query the EC's status until it's no longer busy or we encounter an error. */
+ for (i = 0; i < EC_COMMAND_RETRIES; ++i) {
+ usleep_range(10000, 11000);

- /*
- * Query the EC's status until it's no longer busy or
- * we encounter an error.
- */
- for (i = 0; i < EC_COMMAND_RETRIES; i++) {
- usleep_range(10000, 11000);
-
- trace_cros_ec_request_start(status_msg);
- ret = (*xfer_fxn)(ec_dev, status_msg);
- trace_cros_ec_request_done(status_msg, ret);
- if (ret == -EAGAIN)
- continue;
- if (ret < 0)
- break;
-
- msg->result = status_msg->result;
- if (status_msg->result != EC_RES_SUCCESS)
- break;
-
- status = (struct ec_response_get_comms_status *)
- status_msg->data;
- if (!(status->flags & EC_COMMS_STATUS_PROCESSING))
- break;
- }
+ ret = cros_ec_xfer_command(ec_dev, msg);
+ if (ret == -EAGAIN)
+ continue;
+ if (ret < 0)
+ break;
+
+ *result = msg->result;
+ if (msg->result != EC_RES_SUCCESS)
+ break;

- kfree(status_msg);
+ if (!(status->flags & EC_COMMS_STATUS_PROCESSING))
+ break;
}

+ kfree(msg);
+ return ret;
+}
+
+static int cros_ec_send_command(struct cros_ec_device *ec_dev, struct cros_ec_command *msg)
+{
+ int ret = cros_ec_xfer_command(ec_dev, msg);
+
+ if (msg->result == EC_RES_IN_PROGRESS)
+ ret = cros_ec_wait_until_complete(ec_dev, &msg->result);
+
return ret;
}

--
2.36.1.476.g0c4daa206d-goog