diff options
| author | Tony LIU <junjie.liu@freescale.com> | 2011-12-30 14:32:41 +0800 |
|---|---|---|
| committer | Tony LIU <junjie.liu@freescale.com> | 2011-12-31 09:40:37 +0800 |
| commit | 574b9641d5846e58273dac6bf80fcf1ff312c5c9 (patch) | |
| tree | d720ca668ff8637800d9c0e43dfaa9029bc64c53 | |
| parent | c247025a9f9d80d5ba3e02b8b617b6c155bbcbef (diff) | |
ENGR00171027-2 [USB_HOST]after plug in/out on the hub,host can't work
This issue will happen only when suspend bit is set but phcd is not set
The root cause of this issue is the IC defect.
- If the suspend bit is set without phcd bit set, host controller
can't resume normally
- The workaround is after set suspend bit, we need set the following
bit in USB PHY at once:
HW_USBPHY_PWD_RXPWDRX
HW_USBPHY_PWD_RXPWDDIFF
HW_USBPHY_PWD_RXPWD1PT1
HW_USBPHY_PWD_RXPWDENV
HW_USBPHY_PWD_TXPWDv2I
HW_USBPHY_PWD_TXPWDIBIAS
HW_USBPHY_PWD_TXPWDFS
- Furthermore, after resume, we must clear these bits during the K state
- IC has no plan to fix this issue
- This issue only happen on MX6Q/MX28
driver part
Signed-off-by: Tony LIU <junjie.liu@freescale.com>
| -rw-r--r-- | drivers/usb/host/ehci-arc.c | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/drivers/usb/host/ehci-arc.c b/drivers/usb/host/ehci-arc.c index 4e6674a684df..1d015c92fc9c 100644 --- a/drivers/usb/host/ehci-arc.c +++ b/drivers/usb/host/ehci-arc.c @@ -155,6 +155,16 @@ static irqreturn_t ehci_fsl_pre_irq(int irq, void *dev) pdata->wakeup_event = 0; fsl_usb_recover_hcd(pdev); return IRQ_HANDLED; + } else { + u32 portsc = 0; + struct ehci_hcd *ehci = hcd_to_ehci(hcd); + portsc = ehci_readl(ehci, &ehci->regs->port_status[0]); + /* PORT_USB11 macro is used to judge line state K*/ + if ((PORT_USB11(portsc)) && (portsc & PORT_SUSPEND)) { + pdata = hcd->self.controller->platform_data; + if (pdata->platform_resume) + pdata->platform_resume(pdata); + } } return IRQ_NONE; } |