Prepare for improved (read: pcie) suspend/resume support.

* Flesh out the pcie disable method for 11n chips, as they were defaulting
  to the AR5212 (empty) PCIe disable method.

* Add accessor macros for the HAL PCIe enable/disable calls.

* Call disable on ath_suspend()

* Call enable on ath_resume()

NOTE:

* This has nothing to do with the NIC sleep/run state - the NIC still
  will stay in network-run state rather than supporting network-sleep
  state.  This is preparation work for supporting correct suspend/resume
  WARs for the 11n PCIe NICs.

TODO:

* It may be feasible at this point to keep the chip powered down during
  initial probe/attach and only power it up upon the first configure/reset
  pass.  This however would require correct (for values of "correct")
  tracking of the NIC power configuration state from the driver and that
  just isn't attempted at the moment.

Tested:

* AR9280 on my Lenovo T60, but with no suspend/resume pass (yet).

1 files changed, 6 insertions, 0 deletions

diff --git a/sys/dev/ath/if_ath.c b/sys/dev/ath/if_ath.c
index 3aad7e0..065a428 100644
--- a/sys/dev/ath/if_ath.c
+++ b/sys/dev/ath/if_ath.c
@@ -1318,6 +1318,9 @@ ath_suspend(struct ath_softc *sc)
 	 * mode; pci will power off our socket on suspend and
 	 * CardBus detaches the device.
 	 */
+
+	/* For PCIe, this matters */
+	ath_hal_disablepcie(sc->sc_ah);
 }
 
 /*
@@ -1350,6 +1353,9 @@ ath_resume(struct ath_softc *sc)
 	DPRINTF(sc, ATH_DEBUG_ANY, "%s: if_flags %x\n",
 		__func__, ifp->if_flags);
 
+	/* Re-enable PCIe, re-enable the PCIe bus */
+	ath_hal_enablepcie(ah, 1);
+
 	/*
 	 * Must reset the chip before we reload the
 	 * keycache as we were powered down on suspend.