iPod: Remove/reduce the udelay()s in the button driver. They were in the IPL source, but do not appear to be needed.

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@8530 a1c6a512-1295-4272-9138-f99709370657

1 files changed, 7 insertions, 2 deletions

diff --git a/firmware/drivers/button.c b/firmware/drivers/button.c
index fc9cc7ac25..79378cda48 100644
--- a/firmware/drivers/button.c
+++ b/firmware/drivers/button.c
@@ -121,7 +121,10 @@ static int ipod_4g_button_read(void)
     int new_wheel_value;
     int btn = BUTTON_NONE;
     
-    udelay(250);
+    /* The ipodlinux source had a udelay(250) here, but testing has shown that
+       it is not needed - tested on Nano, Color/Photo and Video. */
+    /* udelay(250);*/
+
     reg = 0x7000c104;
     if ((inl(0x7000c104) & 0x4000000) != 0) {
         reg = reg + 0x3C;   /* 0x7000c140 */
@@ -204,7 +207,9 @@ static int ipod_4g_button_read(void)
 void ipod_4g_button_int(void)
 {
     CPU_HI_INT_CLR = I2C_MASK;
-    udelay(250);
+    /* The following delay was 250 in the ipodlinux source, but 10 seems to 
+       work fine - tested on Nano, Color/Photo and Video. */
+    udelay(10); 
     outl(0x0, 0x7000c140); 
     int_btn = ipod_4g_button_read();
     outl(inl(0x7000c104) | 0xC000000, 0x7000c104);