Oh sorry, let me take last words back. Robert is right it does not work with 
AR9380.
Power control mechanism does not depend on AR_PHY_POWER_TX_RATE_MAX_TPC_ENABLE 
bit.
The AR_PHY_POWER_TX_RATE_MAX register contains a different value 0x00367044 on 
AR9380 and
0x0000007f on older chips.

On Fri, Jul 08, 2011 at 05:27:22PM +0600, Alex Hacker wrote:
> I test the TPC in our own propiertay driver (not ath9k) with AR9380. It works
> likewise previous Atheros chips. I think this is not a HW problem, probably
> EEPROM power limit. Currently have no time to experiment with ath9k (should
> complete AR93xx support in my own driver ASAP).
> 
> On Fri, Jul 08, 2011 at 11:24:25AM +0200, Robert Budde wrote:
> > Does nobody have a clue about the problem? Reproducing the issue is totally
> > easy: Just set the AR_PHY_POWER_TX_RATE_MAX_TPC_ENABLE bit in the
> > AR_PHY_POWER_TX_RATE_MAX register and write a tx-power to the packet
> > descriptor - it won't work! Is nobody at Atheros bothered by the fact that
> > transmit control per packet is obviously not working with their latest
> > product on the market?
> > 
> > Best regards,
> > Robert
> > 
> > _______________________________________________
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> > ath9k-devel@lists.ath9k.org
> > https://lists.ath9k.org/mailman/listinfo/ath9k-devel
> > 
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