diff options
| -rw-r--r-- | drivers/usb/core/hub.c | 46 |
1 files changed, 46 insertions, 0 deletions
diff --git a/drivers/usb/core/hub.c b/drivers/usb/core/hub.c index 93035d862c6..79a58c3a2e2 100644 --- a/drivers/usb/core/hub.c +++ b/drivers/usb/core/hub.c @@ -2151,6 +2151,42 @@ static int hub_port_reset(struct usb_hub *hub, int port1, return status; } +/* Warm reset a USB3 protocol port */ +static int hub_port_warm_reset(struct usb_hub *hub, int port) +{ + int ret; + u16 portstatus, portchange; + + if (!hub_is_superspeed(hub->hdev)) { + dev_err(hub->intfdev, "only USB3 hub support warm reset\n"); + return -EINVAL; + } + + /* Warm reset the port */ + ret = set_port_feature(hub->hdev, + port, USB_PORT_FEAT_BH_PORT_RESET); + if (ret) { + dev_err(hub->intfdev, "cannot warm reset port %d\n", port); + return ret; + } + + msleep(20); + ret = hub_port_status(hub, port, &portstatus, &portchange); + + if (portchange & USB_PORT_STAT_C_RESET) + clear_port_feature(hub->hdev, port, USB_PORT_FEAT_C_RESET); + + if (portchange & USB_PORT_STAT_C_BH_RESET) + clear_port_feature(hub->hdev, port, + USB_PORT_FEAT_C_BH_PORT_RESET); + + if (portchange & USB_PORT_STAT_C_LINK_STATE) + clear_port_feature(hub->hdev, port, + USB_PORT_FEAT_C_PORT_LINK_STATE); + + return ret; +} + /* Check if a port is power on */ static int port_is_power_on(struct usb_hub *hub, unsigned portstatus) { @@ -3519,6 +3555,16 @@ static void hub_events(void) USB_PORT_FEAT_C_PORT_CONFIG_ERROR); } + /* Warm reset a USB3 protocol port if it's in + * SS.Inactive state. + */ + if (hub_is_superspeed(hub->hdev) && + (portstatus & USB_PORT_STAT_LINK_STATE) + == USB_SS_PORT_LS_SS_INACTIVE) { + dev_dbg(hub_dev, "warm reset port %d\n", i); + hub_port_warm_reset(hub, i); + } + if (connect_change) hub_port_connect_change(hub, i, portstatus, portchange); |