iPod Nano 2G LCD sleep: Powering down LDO2 also affects USB, so we can't do that to shut off the LCD. Leave it on for now, and use the lightweight approach for waking up the Leadis LCD.

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@28601 a1c6a512-1295-4272-9138-f99709370657

firmware/target/arm/s5l8700/ipodnano2g/backlight-nano2g.c

@@ -27,6 +27,7 @@
 #include "pmu-target.h"
 
 #ifdef HAVE_LCD_SLEEP
+bool lcd_active(void);
 void lcd_awake(void);
 void lcd_update(void);
 #endif
@@ -38,11 +39,13 @@ void _backlight_set_brightness(int brightness)
 
 void _backlight_on(void)
 {
-    if(pmu_read(0x29) == 1) return;
 #ifdef HAVE_LCD_SLEEP
-    lcd_awake();
-    lcd_update();
-    sleep(HZ/10);
+    if (!lcd_active())
+    {
+        lcd_awake();
+        lcd_update();
+        sleep(HZ/8);
+    }
 #endif
     pmu_write(0x29, 1);
 }