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[23.128.96.18]) by mx.google.com with ESMTP id e3si5241434ejs.199.2021.10.07.02.56.01; Thu, 07 Oct 2021 02:56:21 -0700 (PDT) Received-SPF: pass (google.com: domain of linux-wireless-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) client-ip=23.128.96.18; Authentication-Results: mx.google.com; dkim=pass header.i=@denx.de header.s=phobos-20191101 header.b=UaVefCfD; spf=pass (google.com: domain of linux-wireless-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) smtp.mailfrom=linux-wireless-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232705AbhJGJzj (ORCPT + 75 others); Thu, 7 Oct 2021 05:55:39 -0400 Received: from phobos.denx.de ([85.214.62.61]:36138 "EHLO phobos.denx.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S240478AbhJGJzj (ORCPT ); Thu, 7 Oct 2021 05:55:39 -0400 Received: from [10.88.0.104] (dslb-002-207-026-172.002.207.pools.vodafone-ip.de [2.207.26.172]) (using TLSv1.3 with cipher TLS_AES_128_GCM_SHA256 (128/128 bits)) (No client certificate requested) (Authenticated sender: ch@denx.de) by phobos.denx.de (Postfix) with ESMTPSA id 5166E83484; Thu, 7 Oct 2021 11:53:44 +0200 (CEST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=denx.de; s=phobos-20191101; t=1633600424; bh=zHAEhNX/N5IuLuIN5LqhwR8Pujx2D2YcTBrMgzVZUtA=; h=To:Cc:From:Subject:Date:From; b=UaVefCfDnmGJSBeYUtw1LRj0ff4EtjIF7uWrIu8e3V/jMIYBRcNBBovxdZfZcP5rl FzN5RLAf7so04rSBtrmG193NvU+wxn0l4bp6DZUaZ17kSFbv2toz+WcS1KDkESmD3E vXkFrhPQAu+sO9FFiqEWd3zBqrX2b2HI7rnyRrObIxTtQAk8Ul0jmwTZFpSFo46XML LQPQA752sMQVdl3fkHTjYC67TomZScc4dqZr+XsTc02SLcjMYqP3hml3EZgDU0akzb d20NpMB9ogvMuVbWmBDLoF7mLu+MjFzVTN9QU0wjr6s0XyvOStP7M/iCMis+z474Vx G0mXqPbMJXrog== To: Luca Coelho Cc: linux-wireless@vger.kernel.org, Marek Vasut From: Claudius Heine Subject: Operating Intel Wireless-AC 9260 with one antenna (iwlmvm) Organization: Denx Software Engineering Message-ID: Date: Thu, 7 Oct 2021 11:53:44 +0200 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.14.0 MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 7bit X-Virus-Scanned: clamav-milter 0.103.2 at phobos.denx.de X-Virus-Status: Clean Precedence: bulk List-ID: X-Mailing-List: linux-wireless@vger.kernel.org Hi Luca Coelho, the available documentation [1] [2] on the Intel Wireless-AC 9260 doesn't explicitly state that operating it with just one antenna is impossible, just that it would be necessary for optimal performance. Operating that module with wifi-only and just one antenna connected seems to work somewhat ok, but we had some deauth issues, which could be unrelated. Operating both wifi+bt with just one antenna, makes wifi loose packages while bt is active. I hard-coded the `valid_{t,r}x_ant` to `1` in the nvm parser code, which seem to improve this issue somewhat, but bt pairing seems to be unstable. But the general question is: Is that module even designed to operate with just one antenna connected and are wifi and bt issues to be expected in that case? Bt would not be strictly required in our use-case. If it should work with just one antenna, do you know of any available tools to create those nvm image files or overwrite the nvm with the correct antenna configuration? Or is there another way for this to be configured? Thanks a lot and kind regards, Claudius Heine [1] https://www.intel.com/content/www/us/en/support/articles/000031221/wireless.html [2] https://www.intel.com/content/dam/support/us/en/documents/network-and-i-o/wireless-networking/intel-wifi-adapter-information-guide.pdf