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>

diff --git a/drivers/usb/host/ehci-arc.c b/drivers/usb/host/ehci-arc.c
index bed3056993ce79f9631419497e09f8feaa2ff1ac..8db08ba50921a9e5573a7cf42d5b87d7d8d8dd41 100755 (executable)
--- 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;
 }