From ce592842a49fb35bfdd8897d4b6e510711ab8a55 Mon Sep 17 00:00:00 2001 From: Tony LIU Date: Fri, 30 Dec 2011 14:34:38 +0800 Subject: [PATCH] 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 --- drivers/usb/host/ehci-hub.c | 12 ++++++++++++ 1 file changed, 12 insertions(+) diff --git a/drivers/usb/host/ehci-hub.c b/drivers/usb/host/ehci-hub.c index f5d7fed4a4c0..4f3688bfea35 100644 --- a/drivers/usb/host/ehci-hub.c +++ b/drivers/usb/host/ehci-hub.c @@ -29,6 +29,10 @@ /*-------------------------------------------------------------------------*/ #include +#ifdef CONFIG_ARCH_MX6 +#define MX6_USB_HOST_HACK +#include +#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 */ -- 2.39.5