mfd: Put WM8994 into cache only mode when suspending

This is required by the ASoC driver for very low power modes where the
device is fully idle but we want to update controls.

Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>

diff --git a/drivers/mfd/wm8994-core.c b/drivers/mfd/wm8994-core.c
index 9b8d1ad28ee1eaee25afa64ff67cde262fd8d32e..d3d9d53ca9e37b94da425c04cf7e3070f2e8572b 100644 (file)
--- a/drivers/mfd/wm8994-core.c
+++ b/drivers/mfd/wm8994-core.c
@@ -268,6 +268,7 @@ static int wm8994_suspend(struct device *dev)
        wm8994_reg_write(wm8994, WM8994_SOFTWARE_RESET,
                         wm8994_reg_read(wm8994, WM8994_SOFTWARE_RESET));
 
+       regcache_cache_only(wm8994->regmap, true);
        regcache_mark_dirty(wm8994->regmap);
 
        wm8994->suspended = true;
@@ -298,6 +299,7 @@ static int wm8994_resume(struct device *dev)
                return ret;
        }
 
+       regcache_cache_only(wm8994->regmap, false);
        ret = regcache_sync(wm8994->regmap);
        if (ret != 0) {
                dev_err(dev, "Failed to restore register map: %d\n", ret);