diff options
| author | Sarah Sharp <sarah.a.sharp@linux.intel.com> | 2012-01-06 10:34:31 -0800 |
|---|---|---|
| committer | Sarah Sharp <sarah.a.sharp@linux.intel.com> | 2012-02-14 12:12:24 -0800 |
| commit | 4296c70a5ec316903ef037ed15f154dd3d354ad7 (patch) | |
| tree | 9e56518a0470c2884420864dda4717cf4bd2d0cb /include/linux/usb | |
| parent | 3b9b6acd4798aafe9b9f64ccb7e8eb76f27f904a (diff) | |
USB/xHCI: Enable USB 3.0 hub remote wakeup.
USB 3.0 hubs have a different remote wakeup policy than USB 2.0 hubs.
USB 2.0 hubs, once they have remote wakeup enabled, will always send
remote wakes when anything changes on a port.
However, USB 3.0 hubs have a per-port remote wake up policy that is off
by default. The Set Feature remote wake mask can be changed for any
port, enabling remote wakeup for a connect, disconnect, or overcurrent
event, much like EHCI and xHCI host controller "wake on" port status
bits. The bits are cleared to zero on the initial hub power on, or
after the hub has been reset.
Without this patch, when a USB 3.0 hub gets suspended, it will not send
a remote wakeup on device connect or disconnect. This would show up to
the user as "dead ports" unless they ran lsusb -v (since newer versions
of lsusb use the sysfs files, rather than sending control transfers).
Change the hub driver's suspend method to enable remote wake up for
disconnect, connect, and overcurrent for all ports on the hub. Modify
the xHCI driver's roothub code to handle that request, and set the "wake
on" bits in the port status registers accordingly.
Signed-off-by: Sarah Sharp <sarah.a.sharp@linux.intel.com>
Diffstat (limited to 'include/linux/usb')
| -rw-r--r-- | include/linux/usb/ch11.h | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/include/linux/usb/ch11.h b/include/linux/usb/ch11.h index 0b83acd3360..f1d26b6067f 100644 --- a/include/linux/usb/ch11.h +++ b/include/linux/usb/ch11.h @@ -76,6 +76,11 @@ #define USB_PORT_FEAT_C_BH_PORT_RESET 29 #define USB_PORT_FEAT_FORCE_LINKPM_ACCEPT 30 +/* USB 3.0 hub remote wake mask bits, see table 10-14 */ +#define USB_PORT_FEAT_REMOTE_WAKE_CONNECT (1 << 8) +#define USB_PORT_FEAT_REMOTE_WAKE_DISCONNECT (1 << 9) +#define USB_PORT_FEAT_REMOTE_WAKE_OVER_CURRENT (1 << 10) + /* * Hub Status and Hub Change results * See USB 2.0 spec Table 11-19 and Table 11-20 |