mfd: adp5520: Restore mode bits on resume

The adp5520 unfortunately also clears the BL_EN bit when the nSTNDBY bit is
cleared. So we need to make sure to restore it during resume if it was set
before suspend.

Cc: stable@vger.kernel.org
Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
Acked-by: Michael Hennerich <michael.hennerich@analog.com>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>

1 files changed, 6 insertions, 2 deletions

diff --git a/drivers/mfd/adp5520.c b/drivers/mfd/adp5520.c
index 5ab021f4f6df..0d2eba023439 100644
--- a/drivers/mfd/adp5520.c
+++ b/drivers/mfd/adp5520.c
@@ -36,6 +36,7 @@ struct adp5520_chip {
         struct blocking_notifier_head notifier_list;
         int irq;
         unsigned long id;
+        uint8_t mode;
 };
 
 static int __adp5520_read(struct i2c_client *client,
@@ -326,7 +327,10 @@ static int adp5520_suspend(struct device *dev)
         struct i2c_client *client = to_i2c_client(dev);
         struct adp5520_chip *chip = dev_get_drvdata(&client->dev);
 
-        adp5520_clr_bits(chip->dev, ADP5520_MODE_STATUS, ADP5520_nSTNBY);
+        adp5520_read(chip->dev, ADP5520_MODE_STATUS, &chip->mode);
+        /* All other bits are W1C */
+        chip->mode &= ADP5520_BL_EN | ADP5520_DIM_EN | ADP5520_nSTNBY;
+        adp5520_write(chip->dev, ADP5520_MODE_STATUS, 0);
         return 0;
 }
 
@@ -335,7 +339,7 @@ static int adp5520_resume(struct device *dev)
         struct i2c_client *client = to_i2c_client(dev);
         struct adp5520_chip *chip = dev_get_drvdata(&client->dev);
 
-        adp5520_set_bits(chip->dev, ADP5520_MODE_STATUS, ADP5520_nSTNBY);
+        adp5520_write(chip->dev, ADP5520_MODE_STATUS, chip->mode);
         return 0;
 }
 #endif