[PATCH 1/4] usb: dwc2: get optional vbus-supply regulator once

[Amelie Delaunay]

From: Fabrice Gasnier <fabrice.gasn...@st.com>

Move devm_regulator_get_optional() call to probe routine. This avoids
'vbus-supply' regulator to be requested lots of times, upon each call
to dwc2_vbus_supply_init(), e.g. like with runtime pm.

Fixes: 531ef5ebea96 ("usb: dwc2: add support for host mode external
vbus supply")

Signed-off-by: Fabrice Gasnier <fabrice.gasn...@st.com>
Signed-off-by: Amelie Delaunay <amelie.delau...@st.com>
---
 drivers/usb/dwc2/hcd.c      | 12 +++---------
 drivers/usb/dwc2/platform.c |  8 ++++++++
 2 files changed, 11 insertions(+), 9 deletions(-)

diff --git a/drivers/usb/dwc2/hcd.c b/drivers/usb/dwc2/hcd.c
index 2bd6e6b..c205cfa 100644
--- a/drivers/usb/dwc2/hcd.c
+++ b/drivers/usb/dwc2/hcd.c
@@ -358,16 +358,10 @@ static void dwc2_gusbcfg_init(struct dwc2_hsotg *hsotg)
 
 static int dwc2_vbus_supply_init(struct dwc2_hsotg *hsotg)
 {
-       int ret;
-
-       hsotg->vbus_supply = devm_regulator_get_optional(hsotg->dev, "vbus");
-       if (IS_ERR(hsotg->vbus_supply)) {
-               ret = PTR_ERR(hsotg->vbus_supply);
-               hsotg->vbus_supply = NULL;
-               return ret == -ENODEV ? 0 : ret;
-       }
+       if (hsotg->vbus_supply)
+               return regulator_enable(hsotg->vbus_supply);
 
-       return regulator_enable(hsotg->vbus_supply);
+       return 0;
 }
 
 static int dwc2_vbus_supply_exit(struct dwc2_hsotg *hsotg)
diff --git a/drivers/usb/dwc2/platform.c b/drivers/usb/dwc2/platform.c
index 9a53a58..957e342 100644
--- a/drivers/usb/dwc2/platform.c
+++ b/drivers/usb/dwc2/platform.c
@@ -434,6 +434,14 @@ static int dwc2_driver_probe(struct platform_device *dev)
        if (retval)
                return retval;
 
+       hsotg->vbus_supply = devm_regulator_get_optional(hsotg->dev, "vbus");
+       if (IS_ERR(hsotg->vbus_supply)) {
+               retval = PTR_ERR(hsotg->vbus_supply);
+               hsotg->vbus_supply = NULL;
+               if (retval != -ENODEV)
+                       return retval;
+       }
+
        retval = dwc2_lowlevel_hw_enable(hsotg);
        if (retval)
                return retval;
-- 
2.7.4