input: touchscreen: mainstone: fix pxa2xx+pxa3xx configuration

There are two different ways of flushing the ac97 queue
in this driver, selected by a compile time option.

Change this to a runtime selection to make it work when both
are enabled.
Acked-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Acked-by: Robert Jarzmik <robert.jarzmik@free.fr>
Cc: linux-input@vger.kernel.org
Signed-off-by: Arnd Bergmann <arnd@arndb.de>

drivers/input/touchscreen/mainstone-wm97xx.c

@@ -98,25 +98,20 @@ MODULE_PARM_DESC(ac97_touch_slot, "Touch screen data slot AC97 number");
 
 
 /* flush AC97 slot 5 FIFO on pxa machines */
-#ifdef CONFIG_PXA27x
-static void wm97xx_acc_pen_up(struct wm97xx *wm)
-{
-	schedule_timeout_uninterruptible(1);
-
-	while (MISR & (1 << 2))
-		MODR;
-}
-#else
 static void wm97xx_acc_pen_up(struct wm97xx *wm)
 {
 	unsigned int count;
 
 	schedule_timeout_uninterruptible(1);
 
-	for (count = 0; count < 16; count++)
-		MODR;
+	if (cpu_is_pxa27x()) {
+		while (MISR & (1 << 2))
+			MODR;
+	} else if (cpu_is_pxa3xx()) {
+		for (count = 0; count < 16; count++)
+			MODR;
+	}
 }
-#endif
 
 static int wm97xx_acc_pen_down(struct wm97xx *wm)
 {