On Sat, Jul 7, 2012 at 3:28 PM, Mohammed Shafi <shafi.wireless@xxxxxxxxx> wrote:
> Hi Sven,
>
> On Fri, Jul 6, 2012 at 10:05 PM, Sven Eckelmann <sven@xxxxxxxxxxxxx> wrote:
>> 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.
>
> thanks, i saw the logs. i could do some analysis with AR9485/AR9285.
> as you had said before
> alt_rssi is -128 when one antenna is unplugged, while having both out
> seems to bring some
> +tive value for alt_rssi.
>
>>
>> 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.
>
> thanks i would check this out. As the algorithm itself is bit
> complex, i would just revisit
> and check it out. If i remember correctly Fast antenna diversity was
> working fine with AR9485.
further i check with the CCK/DETECT and MC_GAIN_CTRL in ar9485, it seems to be
ar9003_hw_ant_ctrl_apply CCK_DETECT 80be6788
ar9003_hw_ant_ctrl_apply MC_GAIN_CTRLL 13ef0200
will check it out whats the one bit difference in CCK_DETECT
>
>>
>> Kind regards
>> Sven
>
>
>
> --
> thanks,
> shafi
--
thanks,
shafi
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