mfd: cros_ec: Delay for 50ms when we see EC_CMD_REBOOT_EC

[cascardo/linux.git] / drivers / mfd / cros_ec_spi.c

diff --git a/drivers/mfd/cros_ec_spi.c b/drivers/mfd/cros_ec_spi.c
index 588c700..b396705 100644 (file)
--- a/drivers/mfd/cros_ec_spi.c
+++ b/drivers/mfd/cros_ec_spi.c
@@ -65,6 +65,12 @@
   */
 #define EC_SPI_RECOVERY_TIME_NS        (200 * 1000)
 
+/*
+ * The EC is unresponsive for a time after a reboot command.  Add a
+ * simple delay to make sure that the bus stays locked.
+ */
+#define EC_REBOOT_DELAY_MS     50
+
 /**
  * struct cros_ec_spi - information about a SPI-connected EC
  *
@@ -318,6 +324,9 @@ static int cros_ec_cmd_xfer_spi(struct cros_ec_device *ec_dev,
 
        ret = len;
 exit:
+       if (ec_msg->command == EC_CMD_REBOOT_EC)
+               msleep(EC_REBOOT_DELAY_MS);
+
        mutex_unlock(&ec_spi->lock);
        return ret;
 }