From: Felix Fietkau <nbd@openwrt.org>
To: Rajkumar Manoharan <rmanoharan@atheros.com>
Cc: linville@tuxdriver.com, linux-wireless@vger.kernel.org
Subject: Re: [PATCH v3] ath9k_hw: Fix instable target power control b/w CCK/OFDM
Date: Wed, 06 Apr 2011 18:24:16 +0200 [thread overview]
Message-ID: <4D9C93B0.5050806@openwrt.org> (raw)
In-Reply-To: <1302106372-4622-1-git-send-email-rmanoharan@atheros.com>
On 2011-04-06 6:12 PM, Rajkumar Manoharan wrote:
> The problem is that when the attenuation is increased,
> the rate will start to drop from MCS7 -> MCS6, and finally
> will see MCS1 -> CCK_11Mbps. When the rate is changed b/w
> CCK and OFDM, it will use register desired_scale to calculate
> how much tx gain need to change.
>
> The output power with the same tx gain for CCK and OFDM modulated
> signals are different. This difference is constant for AR9280
> but not AR9285/AR9271. It has different PA architecture
> a constant. So it should be calibrated against this PA
> characteristic.
>
> The driver has to read the calibrated values from EEPROM and set
> the tx power registers accordingly.
>
> Cc: Felix Fietkau<nbd@openwrt.org>
> Signed-off-by: Rajkumar Manoharan<rmanoharan@atheros.com>
Acked-by: Felix Fietkau <nbd@openwrt.org>
Thanks,
- Felix
prev parent reply other threads:[~2011-04-06 16:24 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-04-06 16:12 [PATCH v3] ath9k_hw: Fix instable target power control b/w CCK/OFDM Rajkumar Manoharan
2011-04-06 16:24 ` Felix Fietkau [this message]
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