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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: Arnaud Patard <arnaud.patard@rtp-net.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Arnaud Patard (Rtp) 2011-01-18 00:04:12 +01:00 committed by Greg Kroah-Hartman
parent 3bb8029a24
commit a464dc4d40
1 changed files with 21 additions and 0 deletions
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21
drivers/usb/host/ehci-mxc.c
View File

@ -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: