diff options
Diffstat (limited to 'drivers/usb/core/hub.c')
| -rw-r--r-- | drivers/usb/core/hub.c | 36 |
1 files changed, 23 insertions, 13 deletions
diff --git a/drivers/usb/core/hub.c b/drivers/usb/core/hub.c index 673ee469626..64854d76f52 100644 --- a/drivers/usb/core/hub.c +++ b/drivers/usb/core/hub.c @@ -3241,8 +3241,7 @@ static int usb_req_set_sel(struct usb_device *udev, enum usb3_link_state state) (state == USB3_LPM_U2 && (u2_sel > USB3_LPM_MAX_U2_SEL_PEL || u2_pel > USB3_LPM_MAX_U2_SEL_PEL))) { - dev_dbg(&udev->dev, "Device-initiated %s disabled due " - "to long SEL %llu ms or PEL %llu ms\n", + dev_dbg(&udev->dev, "Device-initiated %s disabled due to long SEL %llu us or PEL %llu us\n", usb3_lpm_names[state], u1_sel, u1_pel); return -EINVAL; } @@ -3320,16 +3319,6 @@ static int usb_set_device_initiated_lpm(struct usb_device *udev, if (enable) { /* - * First, let the device know about the exit latencies - * associated with the link state we're about to enable. - */ - ret = usb_req_set_sel(udev, state); - if (ret < 0) { - dev_warn(&udev->dev, "Set SEL for device-initiated " - "%s failed.\n", usb3_lpm_names[state]); - return -EBUSY; - } - /* * Now send the control transfer to enable device-initiated LPM * for either U1 or U2. */ @@ -3414,7 +3403,28 @@ static int usb_set_lpm_timeout(struct usb_device *udev, static void usb_enable_link_state(struct usb_hcd *hcd, struct usb_device *udev, enum usb3_link_state state) { - int timeout; + int timeout, ret; + __u8 u1_mel = udev->bos->ss_cap->bU1devExitLat; + __le16 u2_mel = udev->bos->ss_cap->bU2DevExitLat; + + /* If the device says it doesn't have *any* exit latency to come out of + * U1 or U2, it's probably lying. Assume it doesn't implement that link + * state. + */ + if ((state == USB3_LPM_U1 && u1_mel == 0) || + (state == USB3_LPM_U2 && u2_mel == 0)) + return; + + /* + * First, let the device know about the exit latencies + * associated with the link state we're about to enable. + */ + ret = usb_req_set_sel(udev, state); + if (ret < 0) { + dev_warn(&udev->dev, "Set SEL for device-initiated %s failed.\n", + usb3_lpm_names[state]); + return; + } /* We allow the host controller to set the U1/U2 timeout internally * first, so that it can change its schedule to account for the |