ENGR00171027-3 usbcore: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

core part

Signed-off-by: Tony LIU <junjie.liu@freescale.com>

diff --git a/drivers/usb/host/ehci-hub.c b/drivers/usb/host/ehci-hub.c
index f5d7fed4a4c0d728ece11c7678091d7bb3b5fd28..4f3688bfea352dc8d437f173006289f017a81325 100644 (file)
--- a/drivers/usb/host/ehci-hub.c
+++ b/drivers/usb/host/ehci-hub.c
@@ -29,6 +29,10 @@
 /*-------------------------------------------------------------------------*/
 #include <linux/usb/otg.h>
 
+#ifdef CONFIG_ARCH_MX6
+#define MX6_USB_HOST_HACK
+#include <linux/fsl_devices.h>
+#endif
 #define        PORT_WAKE_BITS  (PORT_WKOC_E|PORT_WKDISC_E|PORT_WKCONN_E)
 
 #ifdef CONFIG_PM
@@ -1062,6 +1066,14 @@ static int ehci_hub_control (
                        temp &= ~PORT_WKCONN_E;
                        temp |= PORT_WKDISC_E | PORT_WKOC_E;
                        ehci_writel(ehci, temp | PORT_SUSPEND, status_reg);
+#ifdef MX6_USB_HOST_HACK
+                       {
+                               struct fsl_usb2_platform_data *pdata;
+                               pdata = hcd->self.controller->platform_data;
+                               if (pdata->platform_suspend)
+                                       pdata->platform_suspend(pdata);
+                       }
+#endif
                        if (hostpc_reg) {
                                spin_unlock_irqrestore(&ehci->lock, flags);
                                msleep(5);/* 5ms for HCD enter low pwr mode */