ulpi: provide start_srp

Add support for setting CHRGVBUS thanks to start_srp and use it
to workaround a hardware bug on efika mx/sb boards.
See http://lists.infradead.org/pipermail/linux-arm-kernel/2011-January/037341.html

Signed-off-by: Arnaud Patard <arnaud.patard@rtp-net.org>
Index: linux-2.6-submit/drivers/usb/otg/ulpi.c
===================================================================
--- linux-2.6-submit.orig/drivers/usb/otg/ulpi.c	2011-01-04 17:12:26.000000000 +0100
+++ linux-2.6-submit/drivers/usb/otg/ulpi.c	2011-01-06 14:44:50.000000000 +0100
@@ -247,6 +247,14 @@
 	return otg_io_write(otg, flags, ULPI_OTG_CTRL);
 }
 
+static int ulpi_start_srp(struct otg_transceiver *otg, bool on)
+{
+	unsigned int flags = otg_io_read(otg, ULPI_OTG_CTRL);
+
+	flags |= ULPI_OTG_CTRL_CHRGVBUS;
+	return otg_io_write(otg, flags, ULPI_OTG_CTRL);
+}
+
 struct otg_transceiver *
 otg_ulpi_create(struct otg_io_access_ops *ops,
 		unsigned int flags)
@@ -263,6 +271,7 @@
 	otg->init	= ulpi_init;
 	otg->set_host	= ulpi_set_host;
 	otg->set_vbus	= ulpi_set_vbus;
+	otg->start_srp	= ulpi_start_srp;
 
 	return otg;
 }
Index: linux-2.6-submit/drivers/usb/host/ehci-mxc.c
===================================================================
--- linux-2.6-submit.orig/drivers/usb/host/ehci-mxc.c	2011-01-06 14:45:14.000000000 +0100
+++ linux-2.6-submit/drivers/usb/host/ehci-mxc.c	2011-01-06 15:48:16.000000000 +0100
@@ -25,6 +25,8 @@
 
 #include <mach/mxc_ehci.h>
 
+#include <asm/mach-types.h>
+
 #define ULPI_VIEWPORT_OFFSET	0x170
 
 struct ehci_mxc_priv {
@@ -239,6 +241,13 @@
 			dev_err(dev, "unable to enable vbus on transceiver\n");
 			goto err_add;
 		}
+		if (machine_is_mx51_efikamx() || machine_is_mx51_efikasb()) {
+			ret = otg_start_srp(pdata->otg);
+			if (ret) {
+				dev_err(dev, "unable to start srp\n");
+				goto err_add;
+			}
+		}
 	}
 
 	return 0;