Use single state machine for both display and suspend policy

As fb suspend and wakeup are not immediate, display state requests
must be handled separately from actual state transition processing.

A new data pipe display_state_req_pipe is used for making display
state requests and filtering them.

The state machine takes data from display_state_req_pipe and
makes changes known to existing triggers via display_state_pipe.

The suspend policy is integrated to display state handling, which
allows better control over sharing update enable/disable state
with ui side (lipstick).

[mce] Use single state machine for both display and suspend policy

mce-dsme.c

@@ -254,7 +254,7 @@ void request_soft_poweron(void)
 					 USE_INDATA);
 
 	mce_rem_submode_int32(MCE_SOFTOFF_SUBMODE);
-	execute_datapipe(&display_state_pipe,
+	execute_datapipe(&display_state_req_pipe,
 			 GINT_TO_POINTER(MCE_DISPLAY_ON),
 			 USE_INDATA, CACHE_INDATA);
 }
@@ -265,7 +265,7 @@ void request_soft_poweron(void)
 void request_soft_poweroff(void)
 {
 	mce_add_submode_int32(MCE_SOFTOFF_SUBMODE);
-	execute_datapipe(&display_state_pipe,
+	execute_datapipe(&display_state_req_pipe,
 			 GINT_TO_POINTER(MCE_DISPLAY_LPM_OFF),
 			 USE_INDATA, CACHE_INDATA);
 

mce.c

@@ -907,6 +907,8 @@ int main(int argc, char **argv)
 		       0, GINT_TO_POINTER(MCE_NORMAL_SUBMODE));
 	setup_datapipe(&display_state_pipe, READ_WRITE, DONT_FREE_CACHE,
 		       0, GINT_TO_POINTER(MCE_DISPLAY_UNDEF));
+	setup_datapipe(&display_state_req_pipe, READ_WRITE, DONT_FREE_CACHE,
+		       0, GINT_TO_POINTER(MCE_DISPLAY_UNDEF));
 	setup_datapipe(&display_brightness_pipe, READ_WRITE, DONT_FREE_CACHE,
 		       0, GINT_TO_POINTER(0));
 	setup_datapipe(&led_brightness_pipe, READ_WRITE, DONT_FREE_CACHE,

mce.h

@@ -270,6 +270,8 @@ datapipe_struct led_pattern_activate_pipe;
 datapipe_struct led_pattern_deactivate_pipe;
 /** State of display; read only */
 datapipe_struct display_state_pipe;
+/** Desired state of display */
+datapipe_struct display_state_req_pipe;
 /**
  * Display brightness;
  * bits 0-7 is brightness in percent (0-100)

modetransition.c

@@ -147,7 +147,7 @@ static void system_state_trigger(gconstpointer data)
 		 * blank the screen
 		 */
 		if (old_system_state == MCE_STATE_ACTDEAD) {
-			execute_datapipe(&display_state_pipe,
+			execute_datapipe(&display_state_req_pipe,
 					 GINT_TO_POINTER(MCE_DISPLAY_LPM_OFF),
 					 USE_INDATA, CACHE_INDATA);
 		}