From: Christian Lamparter <chunkeey@googlemail.com>
To: "Michal Kudelski" <michal@idsia.ch>
Cc: linux-wireless@vger.kernel.org
Subject: Re: carl9170 driver - reducing the output power
Date: Tue, 26 Jun 2012 19:45:08 +0200 [thread overview]
Message-ID: <201206261945.08250.chunkeey@googlemail.com> (raw)
In-Reply-To: <web-69401031@ti-edu.ch>
On Tuesday, June 26, 2012 02:10:25 PM Michal Kudelski wrote:
> Thank you for the response! Indeed, when I used the latest
> compat-wireless, I was able to control the output power.
I'm glad I could help.
> Now, another question arises: what is the lowest supported
> power level? Do you have any hardware specifications of
> AR9170 that would say what is the lowest power level
> supported by the hardware?
No, I'm sorry, but I don't have such a thing (Maybe Adrian
knows more). From what I knot, the lowest possible value
for the "tpc" registers and the tx descriptor tpc is "0"
(there's no "sign" bit so I'm afraid anything lower than
0 is not possible).
> With iw/iwconfig commands, the lowest achievable power is
> 1 dbm. But I'm thinking about modifying your code in order
> to write fixed values to the corresponding registers. And
> I need to know what to write into the registers in order
> to obtain the lowest possible power :-) .
The power is set by:
carl9170_tx_rate_tpc_chains in tx.c (for most outgoing frame -
except control frames like ACKs/ERP/... which are
controlled by carl9170_set_mac_tpc in mac.c)
Regards,
Christian
prev parent reply other threads:[~2012-06-26 17:45 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-06-25 10:38 carl9170 driver - reducing the output power Michal Kudelski
2012-06-25 17:33 ` Christian Lamparter
2012-06-26 12:10 ` Michal Kudelski
2012-06-26 17:45 ` Christian Lamparter [this message]
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