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 <abrestic@chromium.org>
Reviewed-by: Simon Glass <sjg@chromium.org>
Signed-off-by: Javier Martinez Canillas <javier.martinez@collabora.co.uk>
Signed-off-by: Lee Jones <lee.jones@linaro.org>

diff --git a/drivers/mfd/cros_ec.c b/drivers/mfd/cros_ec.c
index c53804a..fc0c81e 100644 (file)
--- a/drivers/mfd/cros_ec.c
+++ b/drivers/mfd/cros_ec.c
@@ -23,6 +23,9 @@
 #include <linux/mfd/core.h>
 #include <linux/mfd/cros_ec.h>
 #include <linux/mfd/cros_ec_commands.h>
+#include <linux/delay.h>
+
+#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;