[PATCH v3] usb/host/ehci-hub: Fix the issue EG20T USB host controller has long resuming time, when pen drive is attached.
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Intel EG20T USB host controller does not send SOF in resuming time after suspending, if the FLR bit was not cleared. When pen drive is attached, the controller has a long resuming time to try re-connect it. This patch clear the FLR bit in suspending time for fixing the issue. Signed-off-by: Tomoya MORINAGA <tomoya.rohm@xxxxxxxxx> --- v3: Update comments from Alan Stern Add comment in the source code. v2: Update comments from Alan Stern Add patch description Always clear the STS_FLR flag. --- drivers/usb/host/ehci-hub.c | 7 +++++++ 1 files changed, 7 insertions(+), 0 deletions(-) diff --git a/drivers/usb/host/ehci-hub.c b/drivers/usb/host/ehci-hub.c index fc9e7cc..278b589 100644 --- a/drivers/usb/host/ehci-hub.c +++ b/drivers/usb/host/ehci-hub.c @@ -318,6 +318,13 @@ static int ehci_bus_suspend (struct usb_hcd *hcd) ehci_readl(ehci, &ehci->regs->intr_enable); ehci->next_statechange = jiffies + msecs_to_jiffies(10); + + /* Intel EG20T USB host controller does not send SOF + * in resuming time after suspending, if the FLR bit was not cleared. + * Therefore clear the FLR bit in here. + */ + ehci_writel(ehci, STS_FLR, &ehci->regs->status); + spin_unlock_irq (&ehci->lock); /* ehci_work() may have re-enabled the watchdog timer, which we do not -- 18.104.22.168 -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
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