From: Sarah Sharp Date: Fri, 9 Jul 2010 15:08:48 +0000 (+0200) Subject: USB: Fix USB3.0 Port Speed Downgrade after port reset X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=809cd1cb80d7dffe75dc94bc94ef2aab3dadc86a;p=GitHub%2Fmoto-9609%2Fandroid_kernel_motorola_exynos9610.git USB: Fix USB3.0 Port Speed Downgrade after port reset Without this fix, a USB 3.0 port is downgraded to full speed after a port reset of a configured device. The USB 3.0 terminations will be disabled permanently, and USB 3.0 devices will always enumerate as full speed devices, until the host controller is unplugged (if it is an ExpressCard) or the computer is rebooted. Fajun Chen traced this traced the speed downgrade issue to the port reset and the interpretation of port status in USB hub driver code. The hub code was not testing for the port being a SuperSpeed port, and it fell through to the else case of Full Speed. The following patch adds SuperSpeed mapping from the port status, and fixes the speed downgrade issue. Reported-by: Fajun Chen Signed-off-by: Sarah Sharp Cc: stable Signed-off-by: Greg Kroah-Hartman --- diff --git a/drivers/usb/core/hub.c b/drivers/usb/core/hub.c index 83e7bbbe97fa..70cccc75a362 100644 --- a/drivers/usb/core/hub.c +++ b/drivers/usb/core/hub.c @@ -1982,6 +1982,8 @@ static int hub_port_wait_reset(struct usb_hub *hub, int port1, (portstatus & USB_PORT_STAT_ENABLE)) { if (hub_is_wusb(hub)) udev->speed = USB_SPEED_WIRELESS; + else if (portstatus & USB_PORT_STAT_SUPER_SPEED) + udev->speed = USB_SPEED_SUPER; else if (portstatus & USB_PORT_STAT_HIGH_SPEED) udev->speed = USB_SPEED_HIGH; else if (portstatus & USB_PORT_STAT_LOW_SPEED)