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powerpc/usb: fix bug of kernel hang when initializing usb

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If USB UTMI PHY is not enable, writing to portsc register will lead to
kernel hang during boot up.

Signed-off-by: Shengzhou Liu <Shengzhou.Liu@freescale.com>
Reported-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: stable <stable@vger.kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Shengzhou Liu 2012-02-16 18:02:20 +08:00 committed by Greg Kroah-Hartman
parent e90fc3cb08
commit 28c56ea143
2 changed files with 5 additions and 0 deletions
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4
drivers/usb/host/ehci-fsl.c
View file

@ -216,6 +216,8 @@ static void ehci_fsl_setup_phy(struct ehci_hcd *ehci,
unsigned int port_offset)
{
u32 portsc;
struct usb_hcd *hcd = ehci_to_hcd(ehci);
void __iomem *non_ehci = hcd->regs;
portsc = ehci_readl(ehci, &ehci->regs->port_status[port_offset]);
portsc &= ~(PORT_PTS_MSK | PORT_PTS_PTW);
@ -231,6 +233,8 @@ static void ehci_fsl_setup_phy(struct ehci_hcd *ehci,
portsc |= PORT_PTS_PTW;
/* fall through */
case FSL_USB2_PHY_UTMI:
/* enable UTMI PHY */
setbits32(non_ehci + FSL_SOC_USB_CTRL, CTRL_UTMI_PHY_EN);
portsc |= PORT_PTS_UTMI;
break;
case FSL_USB2_PHY_NONE:

1
drivers/usb/host/ehci-fsl.h
View file

@ -47,6 +47,7 @@
#define FSL_SOC_USB_PRICTRL 0x40c /* NOTE: big-endian */
#define FSL_SOC_USB_SICTRL 0x410 /* NOTE: big-endian */
#define FSL_SOC_USB_CTRL 0x500 /* NOTE: big-endian */
#define CTRL_UTMI_PHY_EN (1<<9)
#define CTRL_PHY_CLK_VALID (1 << 17)
#define SNOOP_SIZE_2GB 0x1e
#endif /* _EHCI_FSL_H */