From: Rick Tseng rtseng@nvidia.com
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@li... Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org
--- drivers/usb/host/xhci.c | 12 ++++++++++++ 1 file changed, 12 insertions(+)
--- a/drivers/usb/host/xhci.c +++ b/drivers/usb/host/xhci.c @@ -1108,6 +1108,18 @@ int xhci_resume(struct xhci_hcd *xhci, b 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 */