Fix for Nano timing issues, should resolve crashes, data aborts, and

general glitchiness in playback. Based on the patch in FS#7510 by Jordan 
Anderson.


git-svn-id: svn://svn.rockbox.org/rockbox/trunk@15705 a1c6a512-1295-4272-9138-f99709370657

docs/CREDITS

@@ -346,6 +346,7 @@ Bertrik Sikken
 Karim Boucher
 James Espinoza
 Franz Rühmland
+Jordan Anderson
 
 The libmad team
 The wavpack team

firmware/target/arm/ata-pp5020.c

@@ -44,7 +44,9 @@ void ata_device_init()
 {
     /* From ipod-ide.c:ipod_ide_register() */
     IDE0_CFG |= (1<<5);
-    IDE0_CFG &=~(0x10000000);   /* cpu < 65MHz */
+#ifdef IPOD_NANO
+    IDE0_CFG |= (0x10000000); /* cpu > 65MHz */
+#endif
 
     IDE0_PRI_TIMING0 = 0x10;
     IDE0_PRI_TIMING1 = 0x80002150;

firmware/target/arm/system-pp502x.c

@@ -178,6 +178,9 @@ static void pp_set_cpu_frequency(long frequency)
       case CPUFREQ_MAX:
         CLOCK_SOURCE = 0x10007772;  /* source #1: 24MHz, #2, #3, #4: PLL */
         DEV_TIMING1  = 0x00000303;
+#ifdef IPOD_NANO
+	IDE0_CFG |= (0x10000000); /* Set CPU > 65MHz bit */
+#endif
 #ifdef IPOD_MINI2G
         MLCD_SCLK_DIV = 0x00000001; /* Mono LCD bridge serial clock divider */
 #endif
@@ -199,6 +202,9 @@ static void pp_set_cpu_frequency(long frequency)
       case CPUFREQ_NORMAL:
         CLOCK_SOURCE = 0x10007772;  /* source #1: 24MHz, #2, #3, #4: PLL */
         DEV_TIMING1  = 0x00000303;
+#ifdef IPOD_NANO
+	IDE0_CFG &=~(0x10000000); /* clear > 65MHz bit */
+#endif
 #ifdef IPOD_MINI2G
         MLCD_SCLK_DIV = 0x00000000; /* Mono LCD bridge serial clock divider */
 #endif
@@ -228,6 +234,9 @@ static void pp_set_cpu_frequency(long frequency)
         DEV_TIMING1  = 0x00000303;
 #ifdef IPOD_MINI2G
         MLCD_SCLK_DIV = 0x00000000; /* Mono LCD bridge serial clock divider */
+#endif
+#ifdef IPOD_NANO
+	IDE0_CFG &=~(0x10000000); /* clear > 65MHz bit */
 #endif
         PLL_CONTROL &= ~0x80000000; /* disable PLL */
         cpu_frequency = CPUFREQ_DEFAULT;