From f40dff9edbf1daa14068542d60ae22df78e8c74a Mon Sep 17 00:00:00 2001 From: Mark Brown 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 Signed-off-by: Samuel Ortiz --- 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 f4016a0..e673bda 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, -- 2.7.4