FS#10107: work around the issue on some ipods where after shutdown they do not power on.

Some ipods do not power on correctly after being shut down and require a hard
reset before they work again. This workaround shuts the device down via the OF
which prevents the problem from occurring. There is a cosmetic effect: the low
battery symbol appears briefly on power of.

Change applies to PP502x ipods: 4G/photo/video/mini1g/mini2g/nano1g

Patch by Boris Gjenero (dreamlayers), manual changes by me.


git-svn-id: svn://svn.rockbox.org/rockbox/trunk@24207 a1c6a512-1295-4272-9138-f99709370657

firmware/target/arm/ipod/power-ipod.c

@@ -28,6 +28,10 @@
 #include "pcf50605.h"
 #include "usb.h"
 #include "lcd.h"
+#include "string.h"
+#if CONFIG_CPU == PP5022 || CONFIG_CPU == PP5020
+#include "rtc.h"
+#endif
 
 void power_init(void)
 {
@@ -152,9 +156,24 @@ void power_off(void)
 #endif
 
 #ifndef BOOTLOADER
-#ifdef IPOD_1G2G
+#if CONFIG_CPU == PP5022 || CONFIG_CPU == PP5020
+    /* When shut down by OF, wakeup via alarm is enabled.  This resets the
+       alarm time so an unintended wakeup does not occur. */
+    if (!(pcf50605_wakeup_flags & 0x10))
+        rtc_enable_alarm(false);
+#endif
+#if defined(IPOD_1G2G)
     /* we cannot turn off the 1st gen/ 2nd gen yet. Need to figure out sleep mode. */
     system_reboot();
+#elif CONFIG_CPU == PP5022
+    /* The OF in flash assumes boot failed because the battery is low.
+       If there is no charger connected, this leads to a shutdown.
+     */
+    memcpy((void *)(0x4001ff00+8), "booting!", 8);
+    system_reboot();
+#elif CONFIG_CPU == PP5020
+    memcpy((void *)(0x40017f00+8), "booting!", 8);
+    system_reboot();
 #else
     /* We don't turn off the ipod, we put it in a deep sleep */
     pcf50605_standby_mode();