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mfd: Put WM8994 into reset when suspending

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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>
This commit is contained in:
Mark Brown
2011-02-21 18:30:31 +00:00
committed by Samuel Ortiz
parent f66ea457f6
commit f40dff9edb
1 changed files with 5 additions and 0 deletions
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5
drivers/mfd/wm8994-core.c
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@@ -271,6 +271,11 @@ static int wm8994_suspend(struct device *dev)
if (ret < 0) if (ret < 0)
dev_err(dev, "Failed to save LDO registers: %d\n", ret); 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; wm8994->suspended = true;
ret = regulator_bulk_disable(wm8994->num_supplies, ret = regulator_bulk_disable(wm8994->num_supplies,