Skip to content
Permalink
Browse files

mac80211: rt2x00: reduce tx power to nominal level on RT6352

Current implementation of RT6352 support provides too high tx power
at least on iPA/eLNA devices. Reduce amplification of variable gain
amplifier by 6dB to match board target power of 17dBm.
Transmited signal strength with this patch is similar to that of
stock firmware or pandorabox firmware. Throughput measured with iperf
improves. Device tested: Xiaomi Miwifi Mini.

Signed-off-by: Tomislav Požega <pozega.tomislav@gmail.com>
Signed-off-by: Daniel Golle <daniel@makrotopia.org>
  • Loading branch information...
dangowrt committed Feb 7, 2019
1 parent bdedb79 commit cdb58b2bfe1dd62a3567aee3850aa9640b462f93
@@ -0,0 +1,114 @@
From patchwork Thu Dec 27 14:05:25 2018
Content-Type: text/plain; charset="utf-8"
MIME-Version: 1.0
Content-Transfer-Encoding: 8bit
X-Patchwork-Submitter: Tom Psyborg <pozega.tomislav@gmail.com>
X-Patchwork-Id: 10743705
X-Patchwork-Delegate: kvalo@adurom.com
Return-Path: <linux-wireless-owner@kernel.org>
Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org
[172.30.200.125])
by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 2BC1913B5
for <patchwork-linux-wireless@patchwork.kernel.org>;
Thu, 27 Dec 2018 14:06:03 +0000 (UTC)
Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1])
by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 1C758289EC
for <patchwork-linux-wireless@patchwork.kernel.org>;
Thu, 27 Dec 2018 14:06:03 +0000 (UTC)
Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486)
id 0E022289ED; Thu, 27 Dec 2018 14:06:03 +0000 (UTC)
X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on
pdx-wl-mail.web.codeaurora.org
X-Spam-Level:
X-Spam-Status: No, score=-8.0 required=2.0 tests=BAYES_00,DKIM_SIGNED,
DKIM_VALID,DKIM_VALID_AU,FREEMAIL_FROM,MAILING_LIST_MULTI,RCVD_IN_DNSWL_HI
autolearn=ham version=3.3.1
Received: from vger.kernel.org (vger.kernel.org [209.132.180.67])
by mail.wl.linuxfoundation.org (Postfix) with ESMTP id AE551289C6
for <patchwork-linux-wireless@patchwork.kernel.org>;
Thu, 27 Dec 2018 14:06:02 +0000 (UTC)
Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand
id S1729690AbeL0OFk (ORCPT
<rfc822;patchwork-linux-wireless@patchwork.kernel.org>);
Thu, 27 Dec 2018 09:05:40 -0500
Received: from mail-wr1-f66.google.com ([209.85.221.66]:40863 "EHLO
mail-wr1-f66.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org
with ESMTP id S1729469AbeL0OFk (ORCPT
<rfc822;linux-wireless@vger.kernel.org>);
Thu, 27 Dec 2018 09:05:40 -0500
Received: by mail-wr1-f66.google.com with SMTP id p4so18360549wrt.7
for <linux-wireless@vger.kernel.org>;
Thu, 27 Dec 2018 06:05:39 -0800 (PST)
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed;
d=gmail.com; s=20161025;
h=from:to:cc:subject:date:message-id:mime-version
:content-transfer-encoding;
bh=if95ASzOCk1n4rkrJMt0dbDI3WwTIiBNPf8RvdMIJm8=;
b=N78BHSW85OAzpxBdY2OozZyZYjAg6qKOe0l4D2qxSMPfU6K1kgB9f8YZs5Owl9wPyh
RC88Px2yQIdVDsFm3Kww1hEalZ+bN2zLqb5+mOWGMXJyEz7VHfWg6+hpYTjHMVohLkg5
/+OqTEwl8P17YhXJ0KdEk0aHkt4uSi19pLqD+Jp6SzPPnIY+mx6ODeIAWHi3VH6alfre
plMwZa2EAMcOUCDCygy5ShCJWhXhdeL51VIfYowahUv7xowfw7o5b1+ZihX/DoKGuvHC
hNQAg9QvDOj6lqHyynD9V0pMgGYSVx2g6MPA8uH3vceV1/vgSkaWTxboyiUylHrlMdIo
xZCQ==
X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed;
d=1e100.net; s=20161025;
h=x-gm-message-state:from:to:cc:subject:date:message-id:mime-version
:content-transfer-encoding;
bh=if95ASzOCk1n4rkrJMt0dbDI3WwTIiBNPf8RvdMIJm8=;
b=EyuukiKyMQhAsnvAdNATiSxgngxugcTEOlzcC2eOk78pzv8aNJdhWE3+cJLyh1ctj1
Z/BoIXM298pOrkekyhEZsOnxwGO1p6mrgCBXdoANHvMk93fKtlYT8zNkMZdk6zdXSqBw
bSm8fD5pgGqoLBJH0swL1lrRkHUXSsBsQgCg1YQegfYoWCgdhAnKYmj3OJca5jqfTlJq
pL84CtNEgx9GiXNvsaTU8LeFmKU4GVoMmewsR9WRmw9zSoouDXciq0DHtAoBeElHlCjZ
/8LJQvSLqhONn5xIcFjUdsq3KcqZkCQedwF8WkwVgcA8uksMyKKH0Fj5txHAkeXIyHX3
IhpA==
X-Gm-Message-State: AJcUukdCD27qMfzN5D3LfBblTlOINVVf3zsHMXqUaYwCxv/GoSStqEqb
ha65rhfifdjaR9/NVSakmWv3ZuEByO4=
X-Google-Smtp-Source:
ALg8bN4sgpNxIiBIAhaU8qSDeso9A0BqyR3EIwbO8UwBaShVrZZ2nAmG7p6zo63420r8KRFPizaXQA==
X-Received: by 2002:a5d:47d1:: with SMTP id
l17mr21936207wrs.319.1545919538745;
Thu, 27 Dec 2018 06:05:38 -0800 (PST)
Received: from localhost.localdomain ([31.147.208.18])
by smtp.googlemail.com with ESMTPSA id
p6sm38219239wrx.50.2018.12.27.06.05.37
(version=TLS1 cipher=AES128-SHA bits=128/128);
Thu, 27 Dec 2018 06:05:38 -0800 (PST)
From: =?utf-8?q?Tomislav_Po=C5=BEega?= <pozega.tomislav@gmail.com>
To: linux-wireless@vger.kernel.org
Cc: kvalo@codeaurora.org, hauke@hauke-m.de, nbd@nbd.name,
john@phrozen.org, sgruszka@redhat.com, daniel@makrotopia.org
Subject: [PATCH 1/2] rt2x00: reduce tx power to nominal level on RT6352
Date: Thu, 27 Dec 2018 15:05:25 +0100
Message-Id: <1545919526-4074-1-git-send-email-pozega.tomislav@gmail.com>
X-Mailer: git-send-email 1.7.0.4
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Sender: linux-wireless-owner@vger.kernel.org
Precedence: bulk
List-ID: <linux-wireless.vger.kernel.org>
X-Mailing-List: linux-wireless@vger.kernel.org
X-Virus-Scanned: ClamAV using ClamSMTP

Current implementation of RT6352 support provides too high tx power
at least on iPA/eLNA devices. Reduce amplification of variable gain
amplifier by 6dB to match board target power of 17dBm.
Transmited signal strength with this patch is similar to that of
stock firmware or pandorabox firmware. Throughput measured with iperf
improves. Device tested: Xiaomi Miwifi Mini.

Signed-off-by: Tomislav Požega <pozega.tomislav@gmail.com>
---
drivers/net/wireless/ralink/rt2x00/rt2800lib.c | 2 +-
1 files changed, 1 insertions(+), 1 deletions(-)

--- a/drivers/net/wireless/ralink/rt2x00/rt2800lib.c
+++ b/drivers/net/wireless/ralink/rt2x00/rt2800lib.c
@@ -5814,7 +5814,7 @@ static int rt2800_init_registers(struct
rt2800_register_write(rt2x00dev, TX_SW_CFG2, 0x00000000);
rt2800_register_write(rt2x00dev, MIMO_PS_CFG, 0x00000002);
rt2800_register_write(rt2x00dev, TX_PIN_CFG, 0x00150F0F);
- rt2800_register_write(rt2x00dev, TX_ALC_VGA3, 0x06060606);
+ rt2800_register_write(rt2x00dev, TX_ALC_VGA3, 0x00000000);
rt2800_register_write(rt2x00dev, TX0_BB_GAIN_ATTEN, 0x0);
rt2800_register_write(rt2x00dev, TX1_BB_GAIN_ATTEN, 0x0);
rt2800_register_write(rt2x00dev, TX0_RF_GAIN_ATTEN, 0x6C6C666C);

0 comments on commit cdb58b2

Please sign in to comment.
You can’t perform that action at this time.