From d86c21fd31114e3ef9fae64be335c76aa22859dc Mon Sep 17 00:00:00 2001 From: Andrew Bresticker Date: Thu, 18 Sep 2014 17:18:58 +0200 Subject: mfd: cros_ec: wait for completion of commands that return IN_PROGRESS When an EC command returns EC_RES_IN_PROGRESS, we need to query the state of the EC until it indicates that it is no longer busy. Do this in cros_ec_cmd_xfer() under the EC's mutex so that other commands (e.g. keyboard, I2C passtru) aren't issued to the EC while it is working on the in-progress command. The 10 milliseconds delay and the number of retries are the values that were used by the flashrom tool when retrying commands. Signed-off-by: Andrew Bresticker Reviewed-by: Simon Glass Signed-off-by: Javier Martinez Canillas Signed-off-by: Lee Jones --- drivers/mfd/cros_ec.c | 33 +++++++++++++++++++++++++++++++++ 1 file changed, 33 insertions(+) (limited to 'drivers/mfd') diff --git a/drivers/mfd/cros_ec.c b/drivers/mfd/cros_ec.c index c53804a1451d..fc0c81ef04ff 100644 --- a/drivers/mfd/cros_ec.c +++ b/drivers/mfd/cros_ec.c @@ -23,6 +23,9 @@ #include #include #include +#include + +#define EC_COMMAND_RETRIES 50 int cros_ec_prepare_tx(struct cros_ec_device *ec_dev, struct cros_ec_command *msg) @@ -69,6 +72,36 @@ int cros_ec_cmd_xfer(struct cros_ec_device *ec_dev, mutex_lock(&ec_dev->lock); ret = ec_dev->cmd_xfer(ec_dev, msg); + if (msg->result == EC_RES_IN_PROGRESS) { + int i; + struct cros_ec_command status_msg; + struct ec_response_get_comms_status status; + + status_msg.version = 0; + status_msg.command = EC_CMD_GET_COMMS_STATUS; + status_msg.outdata = NULL; + status_msg.outsize = 0; + status_msg.indata = (uint8_t *)&status; + status_msg.insize = sizeof(status); + + /* + * 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); + + ret = ec_dev->cmd_xfer(ec_dev, &status_msg); + if (ret < 0) + break; + + msg->result = status_msg.result; + if (status_msg.result != EC_RES_SUCCESS) + break; + if (!(status.flags & EC_COMMS_STATUS_PROCESSING)) + break; + } + } mutex_unlock(&ec_dev->lock); return ret; -- cgit v1.2.3-59-g8ed1b