[ARM] 2876/1: N30 - remove task to toggle USB D+ line

Patch from Ben Dooks

The n30 machine file is using a kernel thread to change the
state of the USB D+ pull-up resistor, which is not the proper
way to do this. Once the usb-gadget support for the 24xx is
merge, the proper access method will be added.
This patch also removes the problem of using HZ for the
msleep calls, from Nishanth Aravamudan.

Signed-off-by: Ben Dooks <ben-linux@fluff.org>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

1 files changed, 10 insertions, 20 deletions

diff --git a/arch/arm/mach-s3c2410/mach-n30.c b/arch/arm/mach-s3c2410/mach-n30.c
index 79044d9bce38..66bf5bb2b3db 100644
--- a/arch/arm/mach-s3c2410/mach-n30.c
+++ b/arch/arm/mach-s3c2410/mach-n30.c
@@ -110,34 +110,24 @@ void __init n30_init_irq(void)
         s3c24xx_init_irq();
 }
 
-
-static int n30_usbstart_thread(void *unused)
-{
-        /* Turn off suspend on both USB ports, and switch the
-         * selectable USB port to USB device mode. */
-        writel(readl(S3C2410_MISCCR) & ~0x00003008, S3C2410_MISCCR);
-
-        /* Turn off the D+ pull up for 3 seconds 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(3*HZ);
-
-        s3c2410_gpio_setpin(S3C2410_GPB3, 1);
-
-        return 0;
-}
-
+/* GPB3 is the line that controls the pull-up for the USB D+ line */
 
 void __init n30_init(void)
 {
         s3c_device_i2c.dev.platform_data = &n30_i2ccfg;
 
-        kthread_run(n30_usbstart_thread, NULL, "n30_usbstart");
+        /* 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);
 }
 
 MACHINE_START(N30, "Acer-N30")
-        /* Maintainer: Christer Weinigel <christer@weinigel.se>, Ben Dooks <ben-linux@fluff.org> */
+        /* Maintainer: Christer Weinigel <christer@weinigel.se>,
+                                Ben Dooks <ben-linux@fluff.org>
+        */
         .phys_ram       = S3C2410_SDRAM_PA,
         .phys_io        = S3C2410_PA_UART,
         .io_pg_offst    = (((u32)S3C24XX_VA_UART) >> 18) & 0xfffc,