linux-kernel - [PATCH] mfd:adp5520: Restore mode bits on resume

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Message-Id: <1361271082-29905-1-git-send-email-lars@metafoo.de>
Date:	Tue, 19 Feb 2013 11:51:22 +0100
From:	Lars-Peter Clausen <lars@...afoo.de>
To:	Samuel Ortiz <sameo@...ux.intel.com>
Cc:	Michael Hennerich <michael.hennerich@...log.com>,
	device-drivers-devel@...ckfin.uclinux.org,
	linux-kernel@...r.kernel.org, Lars-Peter Clausen <lars@...afoo.de>
Subject: [PATCH] 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@...r.kernel.org
Signed-off-by: Lars-Peter Clausen <lars@...afoo.de>
---
 drivers/mfd/adp5520.c | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/drivers/mfd/adp5520.c b/drivers/mfd/adp5520.c
index 210dd03..6b40e0c 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
-- 
1.8.0

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