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Power consumption on ath9k

This section documents our metrics used, results and interesting tidbits of information about power consumption for ath9k. If you haven't already go read the Linux 802.11 power consumption section first.

Measured power consumption

We get the IDLE ASSOCIATED power save numbers as 0.02A.

ASPM tweaks

ath9k disables the PLL when in L0s as well as receiver clock when in L1, this is done by using the SerDes. Programming the SerDes must go through the same 288 bit serial shift register as the other analog registers. Hence the 9 writes observed. You can look at the code used here:

• AR9002: ar9002_hw_configpcipowersave() (or ath9k_hw_configpcipowersave() in older kernels)
• AR9003: ar9003_hw_configpcipowersave()