Some super speed device, insert the u3 port, sometimes link is in the Compliance Mode State(0x340), and then satisfy hub_port_warm_reset_required conditions, the software will perform a warm reset, u3 PORTSC becomes 0x2a1203. In hub_port_reset function, it will clear USB_PORT_FEAT_C_CONNECTION by usb_clear_port_feature. Finally, the u3 PORTSC become 0x1203 and super speed device can not be recognized. The patch can solve it. When the software warm reset, it judge Whether the u3 endpoint in the enabled and connected state. if they are, we set connect_change = 1. We verify the patch and can correctly identify super speed devices. Signed-off-by: l00229106 <lpc.li@xxxxxxxxxxxxx> --- drivers/usb/core/hub.c | 12 +++++++++++- 1 file changed, 11 insertions(+), 1 deletion(-) diff --git a/drivers/usb/core/hub.c b/drivers/usb/core/hub.c index 350dcd9..039c4e9 100644 --- a/drivers/usb/core/hub.c +++ b/drivers/usb/core/hub.c @@ -5037,8 +5037,18 @@ static void port_event(struct usb_hub *hub, int port1) usb_reset_device(udev); usb_unlock_device(udev); usb_lock_port(port_dev); - connect_change = 0; } + + ret = hub_port_status(hub, i, + &portstatus, &portchange); + if (ret < 0) + return; + + if ((portstatus & USB_PORT_STAT_CONNECTION) && !udev && + portstatus & USB_PORT_STAT_ENABLE) + connect_change = 1; + else + connect_change = 0; } if (connect_change) -- 1.9.1 -- 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
