1 files changed, 9 insertions, 0 deletions

diff --git a/drivers/mfd/cros_ec_spi.c b/drivers/mfd/cros_ec_spi.c
index 588c700af39c..b396705203fc 100644
--- 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;
 }