From f40dff9edbf1daa14068542d60ae22df78e8c74a Mon Sep 17 00:00:00 2001
From: Mark Brown <broonie@opensource.wolfsonmicro.com>
Date: Mon, 21 Feb 2011 18:30:31 +0000
Subject: [PATCH] mfd: Put WM8994 into reset when suspending

Ensure that the chip is in the lowest power mode possible when suspended
by performing a soft reset on it. On early silicon revisions the lowest
power modes can't be entered without using reset so we can't achieve
equivalent results within the individual drivers.

Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
---
 drivers/mfd/wm8994-core.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/mfd/wm8994-core.c b/drivers/mfd/wm8994-core.c
index f4016a075fd6..e673bda21f5d 100644
--- a/drivers/mfd/wm8994-core.c
+++ b/drivers/mfd/wm8994-core.c
@@ -271,6 +271,11 @@ static int wm8994_suspend(struct device *dev)
 	if (ret < 0)
 		dev_err(dev, "Failed to save LDO registers: %d\n", ret);
 
+	/* Explicitly put the device into reset in case regulators
+	 * don't get disabled in order to ensure consistent restart.
+	 */
+	wm8994_reg_write(wm8994, WM8994_SOFTWARE_RESET, 0x8994);
+
 	wm8994->suspended = true;
 
 	ret = regulator_bulk_disable(wm8994->num_supplies,
-- 
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