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[ath] wake up the hardware from power-save before doing transmit completion checking.

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This was being done in the pre-AR9380 case, but not for AR9380 and later.
When powersave in STA mode is enabled, this may have lead to the transmit
completion code doing this:

* call the task, which doesn't wake up the hardware
* complete the frames, which doesn't touch the hardware
* schedule pending frames on the hardware queue, which DOES touch the
  hardware, and this will be ignored

This would show up in the logs like this:

(with debugging enabled):
Nov 27 23:03:56 lovelace kernel: Q1[  0] (nseg=1) (DS.V:0xfffffe011bd57300 DS.P:0x49b57300) I: 168cc117 L:00000000 F:0005
...
(in general, doesn't require debugging enabled):
Nov 27 23:03:56 lovelace kernel: ath_hal_reg_write: reg=0x00000804, val=0x49b57300, pm=2

That register is a EDMA TX FIFO register (queue 1), and the val is the descriptor
being written.

Whilst here, make sure the software queue gets kicked here.

Tested;

* AR9485, STA mode + powersave
This commit is contained in:
Adrian Chadd 2016-11-28 08:13:20 +00:00
parent 5e61edf60e
commit 908341abeb
1 changed files with 19 additions and 0 deletions
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19
sys/dev/ath/if_ath_tx_edma.c
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@ -755,11 +755,30 @@ ath_edma_tx_proc(void *arg, int npending)
{
struct ath_softc *sc = (struct ath_softc *) arg;
ATH_PCU_LOCK(sc);
sc->sc_txproc_cnt++;
ATH_PCU_UNLOCK(sc);
ATH_LOCK(sc);
ath_power_set_power_state(sc, HAL_PM_AWAKE);
ATH_UNLOCK(sc);
#if 0
DPRINTF(sc, ATH_DEBUG_TX_PROC, "%s: called, npending=%d\n",
__func__, npending);
#endif
ath_edma_tx_processq(sc, 1);
ATH_PCU_LOCK(sc);
sc->sc_txproc_cnt--;
ATH_PCU_UNLOCK(sc);
ATH_LOCK(sc);
ath_power_restore_power_state(sc);
ATH_UNLOCK(sc);
ath_tx_kick(sc);
}
/*