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This patch tries to start the USB gadget in a nice way by
disconnecting and then reconnecting the pull up.
I ought to use the same callback and configuration as RTP does in
mach-h1940.
Index: linux-2.6.14/arch/arm/mach-s3c2410/mach-n30.c
===================================================================
--- linux-2.6.14.orig/arch/arm/mach-s3c2410/mach-n30.c
+++ linux-2.6.14/arch/arm/mach-s3c2410/mach-n30.c
@@ -356,7 +356,33 @@ static void __init n30_init_irq(void)
s3c24xx_init_irq();
}
-/* GPB3 is the line that controls the pull-up for the USB D+ line */
+static int n30_usbstart_thread(void *unused)
+{
+ /* Disable both USB ports */
+ s3c2410_modify_misccr(S3C2410_MISCCR_USBSUSPND0 |
+ S3C2410_MISCCR_USBSUSPND1,
+ S3C2410_MISCCR_USBSUSPND0 |
+ S3C2410_MISCCR_USBSUSPND1);
+
+ /* Turn off the D+ pull up for a few second so that the USB
+ * host at the other end will do a rescan of the USB bus. */
+ s3c2410_gpio_setpin(S3C2410_GPB3, 0);
+
+ msleep_interruptible(1 * 1000);
+
+ /* Enable the USB host port if this is a n30 */
+ if (machine_is_n30())
+ s3c2410_modify_misccr(S3C2410_MISCCR_USBSUSPND0, 0);
+
+ /* Turn off suspend on USB device port and switch it to device
+ * mode. */
+ s3c2410_modify_misccr(S3C2410_MISCCR_USBHOST |
+ S3C2410_MISCCR_USBSUSPND1, 0x0);
+
+ s3c2410_gpio_setpin(S3C2410_GPB3, 1);
+
+ return 0;
+}
static void __init n30_init(void)
{
@@ -380,12 +406,7 @@ static void __init n30_init(void)
msleep(1);
s3c2410_gpio_setpin(S3C2410_GPC5, 1);
- /* Turn off suspend on both USB ports, and switch the
- * selectable USB port to USB device mode. */
-
- s3c2410_modify_misccr(S3C2410_MISCCR_USBHOST |
- S3C2410_MISCCR_USBSUSPND0 |
- S3C2410_MISCCR_USBSUSPND1, 0x0);
+ kthread_run(n30_usbstart_thread, NULL, "n30_usbstart");
}
MACHINE_START(N30, "Acer-N30")
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