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authorMark Brown <broonie@opensource.wolfsonmicro.com>2011-07-25 22:20:33 +0100
committerLiam Girdwood <lrg@slimlogic.co.uk>2011-07-28 10:20:49 +0100
commitc439b8f46ee79147139e124621dbc9e1e7804655 (patch)
tree0c04c3d22396ad477b44ce88cb7a0f74304cb9b6 /drivers/regulator/wm831x-dcdc.c
parentb47ba9fdd336b318a6a6431e6a4556df99272277 (diff)
regulator: Bootstrap wm831x DVS VSEL value from ON VSEL if not already set
If we don't have a DVS VSEL value already set when we start up then start it off with the value currently being used for ON. Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com> Signed-off-by: Liam Girdwood <lrg@slimlogic.co.uk>
Diffstat (limited to 'drivers/regulator/wm831x-dcdc.c')
-rw-r--r--drivers/regulator/wm831x-dcdc.c14
1 files changed, 14 insertions, 0 deletions
diff --git a/drivers/regulator/wm831x-dcdc.c b/drivers/regulator/wm831x-dcdc.c
index 95249f7a0e39..2c5d54b026c9 100644
--- a/drivers/regulator/wm831x-dcdc.c
+++ b/drivers/regulator/wm831x-dcdc.c
@@ -491,6 +491,20 @@ static __devinit void wm831x_buckv_dvs_init(struct wm831x_dcdc *dcdc,
return;
}
+ /* If DVS_VSEL is set to the minimum value then raise it to ON_VSEL
+ * to make bootstrapping a bit smoother.
+ */
+ if (!dcdc->dvs_vsel) {
+ ret = wm831x_set_bits(wm831x,
+ dcdc->base + WM831X_DCDC_DVS_CONTROL,
+ WM831X_DC1_DVS_VSEL_MASK, dcdc->on_vsel);
+ if (ret == 0)
+ dcdc->dvs_vsel = dcdc->on_vsel;
+ else
+ dev_warn(wm831x->dev, "Failed to set DVS_VSEL: %d\n",
+ ret);
+ }
+
ret = wm831x_set_bits(wm831x, dcdc->base + WM831X_DCDC_DVS_CONTROL,
WM831X_DC1_DVS_SRC_MASK, ctrl);
if (ret < 0) {