pinctrl: re-enable old state in case of error in pinctrl_select_state
If a new state is applied, the groups configured in the old state but
not in the new state are disabled.
If something goes wrong and the new state can't be applied, we have to
re-enable those groups.
Signed-off-by: Richard Genoud <richard.genoud@gmail.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
diff --git a/drivers/pinctrl/core.c b/drivers/pinctrl/core.c
index 09f79f2..3e96981 100644
--- a/drivers/pinctrl/core.c
+++ b/drivers/pinctrl/core.c
@@ -897,6 +897,7 @@
struct pinctrl_state *state)
{
struct pinctrl_setting *setting, *setting2;
+ struct pinctrl_state *old_state = p->state;
int ret;
if (p->state == state)
@@ -973,7 +974,24 @@
pinctrl_free_setting(true, setting2);
}
reapply_old_state:
- /* FIXME: re-enable old setting */
+ if (old_state) {
+ list_for_each_entry(setting, &old_state->settings, node) {
+ bool found = false;
+ if (setting->type != PIN_MAP_TYPE_MUX_GROUP)
+ continue;
+ list_for_each_entry(setting2, &state->settings, node) {
+ if (setting2->type != PIN_MAP_TYPE_MUX_GROUP)
+ continue;
+ if (setting2->data.mux.group ==
+ setting->data.mux.group) {
+ found = true;
+ break;
+ }
+ }
+ if (!found)
+ pinmux_enable_setting(setting);
+ }
+ }
return ret;
}