drivers: scmi: adjust the logic of sending messages

When the system enables PM and enters the idle task,
to ensure that the system is not disturbed by interrupts from SM,
it is necessary to disable global interrupts and SM interrupts.
in this case, it need to use the pre_kernel polling logic
instead of the post interrupt logic.

Signed-off-by: Yongxu Wang <[email protected]>

Author: yongxu-wang15

drivers/firmware/scmi/core.c

@@ -158,6 +158,13 @@ static int scmi_send_message_post_kernel(struct scmi_protocol *proto,
 	return ret;
 }
 
+bool scmi_is_current_thread_idle(void)
+{
+	struct k_thread *current = k_current_get();
+
+	return strcmp(k_thread_name_get(current), "idle") == 0;
+}
+
 int scmi_send_message(struct scmi_protocol *proto, struct scmi_message *msg,
 		      struct scmi_message *reply)
 {
@@ -169,7 +176,16 @@ int scmi_send_message(struct scmi_protocol *proto, struct scmi_message *msg,
 		return -EINVAL;
 	}
 
-	if (k_is_pre_kernel()) {
+	bool use_pre_kernel_path = k_is_pre_kernel();
+#ifdef CONFIG_PM
+	/* When PM is enabled and the system manager is referenced in the idle task context,
+	 * the sm interrupt should be disabled in the soc low power phase.
+	 * In this case, the pre kernel is used instead of the post kernel.
+	 */
+	use_pre_kernel_path = use_pre_kernel_path || scmi_is_current_thread_idle();
+#endif
+
+	if (use_pre_kernel_path) {
 		return scmi_send_message_pre_kernel(proto, msg, reply);
 	} else {
 		return scmi_send_message_post_kernel(proto, msg, reply);

drivers/firmware/scmi/prj.conf

@@ -0,0 +1 @@
+CONFIG_THREAD_NAME=y