[ath9k-devel] ath9k: Problems with diversity on AR9330

[Sven Eckelmann <sven@narfation.org>]

On Friday 06 July 2012 17:13:42 Sven Eckelmann wrote:
[...]
> > I just also observer the chain0 is "preferred" unless the RSSI is so
> > poor in it so chain1 is taken.
> > Please check if this work out for your case too.
> 
> Removing the antenna on chain0 doesn't change the alt_rssi value for us. We
> only noticed that frames with alt_rssi != -128 have  the value rx_ant_conf
> == 1 (LNA2) when only chain1 is attached and rx_ant_conf == 2 (LNA1) when
> both/chain0-only are attached. Still most of the packets had alt_rssi ==
> -128 and we saw changes in curr_main_set and curr_alt_set (after lot of
> data was sent).

Here are some logs. We added some debug printk before first check in 
ath_ant_comb_scan ("if (main_rssi > 0 && alt_rssi > 0) {"). We can see a 
difference in the output after (a more or less long time) both antennas were 
unplugged. The output looks extreme different when at least one antenna is 
attached.

alt_ant_conf is calculated using 
"alt_ant_conf = (rs->rs_rssi_ctl[2]) & ATH_ANT_RX_MASK;" and could be wrong. 
curr_alt_set and curr_main_set come from div_ant_conf queried using 
ath9k_hw_antdiv_comb_conf_get.

Kind regards
	Sven
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