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Commit a464dc4d authored by Arnaud Patard's avatar Arnaud Patard Committed by Greg Kroah-Hartman
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USB: ehci-mxc: add work-around for efika mx/sb bug 

Add support for setting CHRGVBUS 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: default avatarArnaud Patard <arnaud.patard@rtp-net.org>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@suse.de>
parent 3bb8029a

drivers/usb/host/ehci-mxc.c

+21 −0
Original line number Diff line number Diff line
@@ -21,10 +21,13 @@ 
#include <linux/clk.h>

#include <linux/delay.h>

#include <linux/usb/otg.h>

#include <linux/usb/ulpi.h>

#include <linux/slab.h>



#include <mach/mxc_ehci.h>



#include <asm/mach-types.h>



#define ULPI_VIEWPORT_OFFSET	0x170



struct ehci_mxc_priv {
@@ -114,6 +117,7 @@ static int ehci_mxc_drv_probe(struct platform_device *pdev) 
	struct usb_hcd *hcd;

	struct resource *res;

	int irq, ret;

	unsigned int flags;

	struct ehci_mxc_priv *priv;

	struct device *dev = &pdev->dev;

	struct ehci_hcd *ehci;
@@ -240,6 +244,23 @@ static int ehci_mxc_drv_probe(struct platform_device *pdev) 
	if (ret)

		goto err_add;



	if (pdata->otg) {

		/*

		 * efikamx and efikasb have some hardware bug which is

		 * preventing usb to work unless CHRGVBUS is set.

		 * It's in violation of USB specs

		 */

		if (machine_is_mx51_efikamx() || machine_is_mx51_efikasb()) {

			flags = otg_io_read(pdata->otg, ULPI_OTG_CTRL);

			flags |= ULPI_OTG_CTRL_CHRGVBUS;

			ret = otg_io_write(pdata->otg, flags, ULPI_OTG_CTRL);

			if (ret) {

				dev_err(dev, "unable to set CHRVBUS\n");

				goto err_add;

			}

		}

	}



	return 0;



err_add: