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| author | Mathias Nyman <mathias.nyman@linux.intel.com> | 2016-10-20 15:09:19 (GMT) |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2016-10-20 15:54:55 (GMT) |
| commit | 346e99736c3ce328fd42d678343b70243aca5f36 (patch) | |
| tree | 4132b0eb2dcbd89e109c7ce5cacb8626a16220ba /drivers/usb/host/sl811.h | |
| parent | 4c39135aa412d2f1381e43802523da110ca7855c (diff) | |
| download | linux-346e99736c3ce328fd42d678343b70243aca5f36.tar.xz | |
xhci: workaround for hosts missing CAS bit
If a device is unplugged and replugged during Sx system suspend
some Intel xHC hosts will overwrite the CAS (Cold attach status) flag
and no device connection is noticed in resume.
A device in this state can be identified in resume if its link state
is in polling or compliance mode, and the current connect status is 0.
A device in this state needs to be warm reset.
Intel 100/c230 series PCH specification update Doc #332692-006 Errata #8
Observed on Cherryview and Apollolake as they go into compliance mode
if LFPS times out during polling, and re-plugged devices are not
discovered at resume.
Signed-off-by: Mathias Nyman <mathias.nyman@linux.intel.com>
CC: <stable@vger.kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/usb/host/sl811.h')
0 files changed, 0 insertions, 0 deletions