regulator: Handle regulators without suspend mode configuration

Since some regulators in the system may not support suspend mode
configuration we need to allow some regulators to have a missing
suspend mode configuration. Do this by requiring that disabled
regulators are explicitly flagged and then skip over regulators
that have no state specified.

Try to avoid surprises by warning the if we could set the state
but no configuration is provided.  This also ensures that an all
zeros configuration generates a warning rather than silently
disabling the regulator.

Reported-by: Joonyoung Shim <jy0922.shim@samsung.com>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Signed-off-by: Liam Girdwood <lrg@slimlogic.co.uk>

1 files changed, 22 insertions, 3 deletions

diff --git a/drivers/regulator/core.c b/drivers/regulator/core.c
index 7d0c0d7d90ca..2dab0d9e11f5 100644
--- a/drivers/regulator/core.c
+++ b/drivers/regulator/core.c
@@ -581,10 +581,29 @@ static int suspend_set_state(struct regulator_dev *rdev,
         struct regulator_state *rstate)
 {
         int ret = 0;
+        bool can_set_state;
 
-        /* enable & disable are mandatory for suspend control */
-        if (!rdev->desc->ops->set_suspend_enable ||
-                !rdev->desc->ops->set_suspend_disable) {
+        can_set_state = rdev->desc->ops->set_suspend_enable &&
+                rdev->desc->ops->set_suspend_disable;
+
+        /* If we have no suspend mode configration don't set anything;
+         * only warn if the driver actually makes the suspend mode
+         * configurable.
+         */
+        if (!rstate->enabled && !rstate->disabled) {
+                if (can_set_state)
+                        printk(KERN_WARNING "%s: No configuration for %s\n",
+                               __func__, rdev_get_name(rdev));
+                return 0;
+        }
+
+        if (rstate->enabled && rstate->disabled) {
+                printk(KERN_ERR "%s: invalid configuration for %s\n",
+                       __func__, rdev_get_name(rdev));
+                return -EINVAL;
+        }
+
+        if (!can_set_state) {
                 printk(KERN_ERR "%s: no way to set suspend state\n",
                         __func__);
                 return -EINVAL;