Bug ID: 192415
Summary: [ath] AR933x power save causes the AR9331 to stop DMA
Product: Base System
Status: Needs Triage
Severity: Affects Only Me
The current powersave code in the ath(4) driver / HAL is causing issues on the
Even if powersave is disabled, the chip is put into powersave mode when no VAPs
are in use. This seems to lock up the DMA side of things.
* lots of "disable rx dma failed" messages
* no packets being transmitted/received
* TX/RX interrupt counts don't increase
* if AH_INTERRUPT_DEBUGGING is defined, then sync interrupts are posted - 0x200
Now, I'm not sure yet what those bits are. I guess it's similar to the AR9340
ones - AR9340_INTR_SYNC_MAC_SLEEP_ACCESS (0x40). That meant that it was
configured whilst the MAC was asleep. Ugh.
If i disable the power save code in if_ath.c (ie, make all the
ath_hal_setpowermode() calls to HAL_PM_AWAKE) then things work fine.
So, figure out what is being programmed whilst the MAC is asleep, or what is
currently not shut down correctly before the MAC is put to sleep.
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