diff options
| author | Mathias Nyman <[email protected]> | 2016-10-20 18:09:19 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <[email protected]> | 2016-10-20 17:54:55 +0200 |
| commit | 346e99736c3ce328fd42d678343b70243aca5f36 (patch) | |
| tree | 4132b0eb2dcbd89e109c7ce5cacb8626a16220ba /tools/perf/util/scripting-engines/trace-event-python.c | |
| parent | 4c39135aa412d2f1381e43802523da110ca7855c (diff) | |
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 <[email protected]>
CC: <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
Diffstat (limited to 'tools/perf/util/scripting-engines/trace-event-python.c')
0 files changed, 0 insertions, 0 deletions