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

[Sunil Mehta <sunil2@telenetsystems.com>]

Hi Shafi,

We are facing similar problems with configuring the LNA2 of AR9331 for
diversity. Even though we try to set the RXCHAINMASK = 0x03, on checking
the value, it keeps showing as 0x01.

We are currently using LSDK-9.2.0_U10.1020. It appears that some where the
value may be hardcoded to 0x01 in this Release.

Can you suggest how to solve this.

Regards,
Sunil.


On 7/7/12 3:44 PM, "Mohammed Shafi" <shafi.wireless@gmail.com> wrote:

>On Sat, Jul 7, 2012 at 3:28 PM, Mohammed Shafi <shafi.wireless@gmail.com>
>wrote:
>> Hi Sven,
>>
>> On Fri, Jul 6, 2012 at 10:05 PM, Sven Eckelmann <sven@narfation.org>
>>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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