diff options
| author | Shengzhou Liu <Shengzhou.Liu@freescale.com> | 2012-02-02 07:23:14 +0400 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2012-02-03 00:46:36 +0400 |
| commit | 529febeee680dc22416fca033151a5e8bc620447 (patch) | |
| tree | 6ea05e6734be0b1699c5e96f6eba1912fd801a94 /drivers/usb/host/ehci-fsl.c | |
| parent | ed2833ac7ee86ee00f6dd3085a32752209fd8b6e (diff) | |
| download | linux-529febeee680dc22416fca033151a5e8bc620447.tar.xz | |
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>
Diffstat (limited to 'drivers/usb/host/ehci-fsl.c')
| -rw-r--r-- | drivers/usb/host/ehci-fsl.c | 11 |
1 files changed, 9 insertions, 2 deletions
diff --git a/drivers/usb/host/ehci-fsl.c b/drivers/usb/host/ehci-fsl.c index b556a72264d1..c26a82e83f6e 100644 --- a/drivers/usb/host/ehci-fsl.c +++ b/drivers/usb/host/ehci-fsl.c @@ -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; |