diff options
| author | Rick Tseng <rtseng@nvidia.com> | 2019-10-04 14:59:30 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2019-10-17 13:43:23 -0700 |
| commit | f4109e2a27705bf27f1da879aa8fe52208452850 (patch) | |
| tree | edaf58983c51379a6e33230a9b9aa5bafeea6f92 /drivers/usb | |
| parent | 7f14f84339f328233e8201e69e98085ed9bc3e12 (diff) | |
usb: xhci: wait for CNR controller not ready bit in xhci resume
commit a70bcbc322837eda1ab5994d12db941dc9733a7d upstream.
NVIDIA 3.1 xHCI card would lose power when moving power state into D3Cold.
Thus we need to wait for CNR bit to clear in xhci resume, just as in
xhci init.
[Minor changes to comment and commit message -Mathias]
Cc: <stable@vger.kernel.org>
Signed-off-by: Rick Tseng <rtseng@nvidia.com>
Signed-off-by: Mathias Nyman <mathias.nyman@linux.intel.com>
Link: https://lore.kernel.org/r/1570190373-30684-6-git-send-email-mathias.nyman@linux.intel.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/usb')
| -rw-r--r-- | drivers/usb/host/xhci.c | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/drivers/usb/host/xhci.c b/drivers/usb/host/xhci.c index 815e4ffe3c8b..dcba11796485 100644 --- a/drivers/usb/host/xhci.c +++ b/drivers/usb/host/xhci.c @@ -1044,6 +1044,18 @@ int xhci_resume(struct xhci_hcd *xhci, bool hibernated) hibernated = true; if (!hibernated) { + /* + * Some controllers might lose power during suspend, so wait + * for controller not ready bit to clear, just as in xHC init. + */ + retval = xhci_handshake(&xhci->op_regs->status, + STS_CNR, 0, 10 * 1000 * 1000); + if (retval) { + xhci_warn(xhci, "Controller not ready at resume %d\n", + retval); + spin_unlock_irq(&xhci->lock); + return retval; + } /* step 1: restore register */ xhci_restore_registers(xhci); /* step 2: initialize command ring buffer */ |