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powerpc/usb: fix issue of CPU halt when missing USB PHY clock 

when missing USB PHY clock, kernel booting up will halt during USB
initialization. We should check USBGP[PHY_CLK_VALID] bit to avoid
CPU hang in this case.

Signed-off-by: Shengzhou Liu <Shengzhou.Liu@freescale.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Shengzhou Liu 2012-02-02 11:23:14 +08:00 committed by Greg Kroah-Hartman
parent ed2833ac7e
commit 529febeee6
2 changed files with 10 additions and 2 deletions
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11
drivers/usb/host/ehci-fsl.c
View File

@ -239,7 +239,7 @@ static void ehci_fsl_setup_phy(struct ehci_hcd *ehci,
ehci_writel(ehci, portsc, &ehci->regs->port_status[port_offset]);
}
static void ehci_fsl_usb_setup(struct ehci_hcd *ehci)
static int ehci_fsl_usb_setup(struct ehci_hcd *ehci)
{
struct usb_hcd *hcd = ehci_to_hcd(ehci);
struct fsl_usb2_platform_data *pdata;
@ -299,12 +299,19 @@ static void ehci_fsl_usb_setup(struct ehci_hcd *ehci)
#endif
out_be32(non_ehci + FSL_SOC_USB_SICTRL, 0x00000001);
}
if (!(in_be32(non_ehci + FSL_SOC_USB_CTRL) & CTRL_PHY_CLK_VALID)) {
printk(KERN_WARNING "fsl-ehci: USB PHY clock invalid\n");
return -ENODEV;
}
return 0;
}
/* called after powerup, by probe or system-pm "wakeup" */
static int ehci_fsl_reinit(struct ehci_hcd *ehci)
{
ehci_fsl_usb_setup(ehci);
if (ehci_fsl_usb_setup(ehci))
return -ENODEV;
ehci_port_power(ehci, 0);
return 0;

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

@ -45,5 +45,6 @@
#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_PHY_CLK_VALID (1 << 17)
#define SNOOP_SIZE_2GB 0x1e
#endif /* _EHCI_FSL_H */