usb: musb: Don't set d+ high before enable for 2430 glue layer

At least 2430 glue layer pulls d+ high on start up even if there are
no gadgets configured. This is bad at least for anything using a separate
battery charger chip as it can confuse the charger detection.

Let's fix the issue by removing the bogus glue layer code tinkering
with the SESSION bit. As pointed out Bin Liu <b-liu@ti.com> and
Sergei Shtylyov <sergei.shtylyov@cogentembedded.com>, the SESSION
bit just starts host mode if ID pin is grounded, and starts the
srp is ID pin is floating. So without the ID pin changing, it's
unable to force musb mode to anything. And just for starting a
host mode, things work fine without this code.

Signed-off-by: Tony Lindgren <tony@atomide.com>
Signed-off-by: Bin Liu <b-liu@ti.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/usb/musb/omap2430.c

@@ -122,16 +122,6 @@ static void omap2430_musb_set_vbus(struct musb *musb, int is_on)
 		musb_readb(musb->mregs, MUSB_DEVCTL));
 }
 
-static int omap2430_musb_set_mode(struct musb *musb, u8 musb_mode)
-{
-	u8	devctl = musb_readb(musb->mregs, MUSB_DEVCTL);
-
-	devctl |= MUSB_DEVCTL_SESSION;
-	musb_writeb(musb->mregs, MUSB_DEVCTL, devctl);
-
-	return 0;
-}
-
 static inline void omap2430_low_level_exit(struct musb *musb)
 {
 	u32 l;
@@ -472,7 +462,6 @@ static const struct musb_platform_ops omap2430_ops = {
 	.init		= omap2430_musb_init,
 	.exit		= omap2430_musb_exit,
 
-	.set_mode	= omap2430_musb_set_mode,
 	.set_vbus	= omap2430_musb_set_vbus,
 
 	.enable		= omap2430_musb_enable,