[Bug 209135] [ath] AR9300: TXDP update whilst chip is in powersave

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=209135

            Bug ID: 209135
           Summary: [ath] AR9300: TXDP update whilst chip is in powersave
           Product: Base System
           Version: 11.0-CURRENT
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: adrian at freebsd.org

This happened during testing on the AR9380:

Apr 28 12:13:40 sabrina kernel: ath_hal_reg_write: reg=0x00000804,
val=0x53b15300, pm=2
Apr 28 12:13:40 sabrina kernel: ath_hal_reg_write: reg=0x00000804,
val=0x53b8a600, pm=2
Apr 28 12:13:42 sabrina kernel: ath_hal_reg_write: reg=0x00000804,
val=0x53b07200, pm=2
Apr 28 12:13:42 sabrina kernel: ath_hal_reg_write: reg=0x00000804,
val=0x53b81000, pm=2

.. this means something was writing to a TXDP (0x0800 + (txq*4)) whilst the
chip was in sleep state. We can't do this.

Go add some debugging to the transmit paths to capture /where/ we are doing
this whilst the chip is asleep.

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