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| author | Sarah Sharp <sarah.a.sharp@linux.intel.com> | 2012-03-16 23:58:20 +0400 |
|---|---|---|
| committer | Sarah Sharp <sarah.a.sharp@linux.intel.com> | 2012-04-11 19:28:54 +0400 |
| commit | 5af98bb06dee79d28c805f9fd0805ce791121784 (patch) | |
| tree | 14f198d776b386c56dc6eb3065227c579ab54a58 | |
| parent | 4e833c0b87a30798e67f06120cecebef6ee9644c (diff) | |
| download | linux-5af98bb06dee79d28c805f9fd0805ce791121784.tar.xz | |
xhci: Warn when hosts don't halt.
Eric Fu reports a problem with his VIA host controller fetching a zeroed
event ring pointer on resume from suspend. The host should have been
halted, but we can't be sure because that code ignores the return value
from xhci_halt(). Print a warning when the host controller refuses to
halt within XHCI_MAX_HALT_USEC (currently 16 seconds).
(Update: it turns out that the VIA host controller is reporting a halted
state when it fetches the zeroed event ring pointer. However, we still
need this warning for other host controllers.)
Signed-off-by: Sarah Sharp <sarah.a.sharp@linux.intel.com>
| -rw-r--r-- | drivers/usb/host/xhci.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/drivers/usb/host/xhci.c b/drivers/usb/host/xhci.c index e1963d4a430f..f68bc15d21e8 100644 --- a/drivers/usb/host/xhci.c +++ b/drivers/usb/host/xhci.c @@ -106,6 +106,9 @@ int xhci_halt(struct xhci_hcd *xhci) STS_HALT, STS_HALT, XHCI_MAX_HALT_USEC); if (!ret) xhci->xhc_state |= XHCI_STATE_HALTED; + else + xhci_warn(xhci, "Host not halted after %u microseconds.\n", + XHCI_MAX_HALT_USEC); return ret; } |