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xhci: Warn when hosts don't halt.

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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>
This commit is contained in:
Sarah Sharp 2012-03-16 12:58:20 -07:00
parent 4e833c0b87
commit 5af98bb06d
1 changed files with 3 additions and 0 deletions
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3
drivers/usb/host/xhci.c
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@ -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;
}