drivers: serial: stm32: prevent suspend to ram when operation in progress
Prevent the system to enter Suspend to RAM state while UART operation is
in progress.
Signed-off-by: Guillaume Gautier <guillaume.gautier-ext@st.com>
diff --git a/drivers/serial/uart_stm32.c b/drivers/serial/uart_stm32.c
index c785c1e..cba80aa 100644
--- a/drivers/serial/uart_stm32.c
+++ b/drivers/serial/uart_stm32.c
@@ -96,6 +96,9 @@
if (!data->pm_policy_state_on) {
data->pm_policy_state_on = true;
pm_policy_state_lock_get(PM_STATE_SUSPEND_TO_IDLE, PM_ALL_SUBSTATES);
+ if (IS_ENABLED(CONFIG_PM_S2RAM)) {
+ pm_policy_state_lock_get(PM_STATE_SUSPEND_TO_RAM, PM_ALL_SUBSTATES);
+ }
}
}
@@ -106,6 +109,9 @@
if (data->pm_policy_state_on) {
data->pm_policy_state_on = false;
pm_policy_state_lock_put(PM_STATE_SUSPEND_TO_IDLE, PM_ALL_SUBSTATES);
+ if (IS_ENABLED(CONFIG_PM_S2RAM)) {
+ pm_policy_state_lock_put(PM_STATE_SUSPEND_TO_RAM, PM_ALL_SUBSTATES);
+ }
}
}
#endif /* CONFIG_PM */
