diff options
| author | Eugene Korenevsky <[email protected]> | 2021-01-10 20:36:09 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <[email protected]> | 2021-01-12 17:16:37 +0100 |
| commit | 280a9045bb18833db921b316a5527d2b565e9f2e (patch) | |
| tree | 3ba47c9fdf46093bd5ebde9908ed57acfa86ef06 /tools/perf/util/scripting-engines/trace-event-python.c | |
| parent | 5f8e084026543bc06eb9b2a623de55bb4ab3e60e (diff) | |
ehci: fix EHCI host controller initialization sequence
According to EHCI spec, EHCI HC clears USBSTS.HCHalted whenever
USBCMD.RS=1.
However, it is a good practice to wait some time after setting USBCMD.RS
(approximately 100ms) until USBSTS.HCHalted become zero.
Without this waiting, VirtualBox's EHCI virtual HC accidentally hangs
(see BugLink).
BugLink: https://bugzilla.kernel.org/show_bug.cgi?id=211095
Acked-by: Alan Stern <[email protected]>
Signed-off-by: Eugene Korenevsky <[email protected]>
Cc: stable <[email protected]>
Link: https://lore.kernel.org/r/[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