From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-wm1-f46.google.com (mail-wm1-f46.google.com [209.85.128.46]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 331903D47D2 for ; Wed, 8 Apr 2026 15:25:45 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.128.46 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1775661946; cv=none; b=llvRgT8feWqHNtRTJjv+60GivtmR9zLyN8Acl9ihxTo9AitE6jU9sbVzd1CNo4iCeb+UbY37hbQbzP7N55TleVK/NhLFroIFVUDAhXHaTcfs1gJK3AEe/pqCsXNWm6ZcLv8XlUdU7arCXIt8C2/puJ7lKj5nyq0ADa+ypVszaVs= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1775661946; c=relaxed/simple; bh=5uZQetOvevtL0mvlMj7KiFmCmHDYLkwGGitGi+quo4Q=; h=Message-ID:Date:MIME-Version:Subject:To:Cc:References:From: In-Reply-To:Content-Type; b=p03JmMOivotIN9/teCAZxYvbzr2s9g9FQKTPRw7xauiwh7p4DTFHZnrq3SXqQcU3yYu/L2YLypGFW3yholzlw7858Vked165CGQWUQ2PFO3wHuOdTGbXZVBr51pw7Ji+aMHcPLB5ISqDp+RG/4JzZ6H6C4gZ06CG//+GFfYi0Vs= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com; spf=pass smtp.mailfrom=gmail.com; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b=HdzXm6xa; arc=none smtp.client-ip=209.85.128.46 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=gmail.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="HdzXm6xa" Received: by mail-wm1-f46.google.com with SMTP id 5b1f17b1804b1-4887eca00c4so43237225e9.2 for ; Wed, 08 Apr 2026 08:25:45 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20251104; t=1775661944; x=1776266744; darn=vger.kernel.org; h=content-transfer-encoding:in-reply-to:from:content-language :references:cc:to:subject:user-agent:mime-version:date:message-id :from:to:cc:subject:date:message-id:reply-to; bh=EC2v+Q/gnBLhwWmQlqWcd9BxtNoiH00jSXgAbXbWBps=; b=HdzXm6xaIgQTHUdWQkMXqt+5zsdXnafOQU8548jqgHOjj6TQgYOTrqjXlkKfK08RHu tSgIlDUN2jiP6x308CB0mIdK+rNED2+6SzlOCQ9SLRj2qw6k7vxCE8A0hIlPTVTwRtN/ uIRDALUJbG6Xc15Qm3oFQq0zIUarcH6UTaIERI/0WhnjgiFqnzy/5jcdMOYrGDqpO3wv v1gOhAQqh8u8imkYwdZ9FR0K01/7mnvzyA3YobSUFq5iw6bi2ef1s/WiOrckIMMsaaWM 3KxCvVvVeKkNCfwKcSewF6BMcXu9H5xFOZ0ytvBVdU1AvBIKLUl2T6SRMT47mTj4hkIm hzDA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20251104; t=1775661944; x=1776266744; h=content-transfer-encoding:in-reply-to:from:content-language :references:cc:to:subject:user-agent:mime-version:date:message-id :x-gm-gg:x-gm-message-state:from:to:cc:subject:date:message-id :reply-to; bh=EC2v+Q/gnBLhwWmQlqWcd9BxtNoiH00jSXgAbXbWBps=; b=IehA83/mvaTUBhOPz13VNL5cbP7+86mpMvBtOQ9Z9vuUpNd9Bo5Na1HuVLJDtJNEr8 k7FivA6stHomPzH3Njz5jWsPDCYpDgLaPB2WCoRmWMsZoJxlQWRGgkCcEy1Gr+MtYvXe l3Et4cNwtQQPYRbsSVnGVMsGykcI+n7iqD/Up/hqztswSxtaE+35Nq11aWgIeo4lVJdO EuqvaBU87OJaKTKQRlMXMbWurnn6W56enaBsJrJJKd0J5g7fJWoQ3CFGpY4x5+QcMV3g I0b0WgmH+baoh/yyKCSq6Uy85DqU6R6H2ZaghdHMAsX7a7RfpicKhnqo6F46Nui2ybp/ ZK+g== X-Forwarded-Encrypted: i=1; AJvYcCWltpCEDxYN4pQqTeRYUYWH0CRte7vrzlQ1fWhwlfVfNA1tsVE/23oScEM7We5YEr1oGJ8tv//+RKO7@vger.kernel.org X-Gm-Message-State: AOJu0YxX8LUqweraNVkOGJ9/CCsLLJ46R5bdNkp2165xf0h6kzypCOkI En5noBqfJCgzT89tZq+PCw+nUHWUpBnjKSJvVPGtNnRTqbH5rm3ycCxq X-Gm-Gg: AeBDieu75lTFMYjnsDUrEfbugWyQp/MR33CgWrxH4BqxABMpPu342HiUT0Cnm1k9zgg mDDcKrRr4GAeJ29/ng0ugq8POnL3lBKnp1pV3ZuYQwjWg4sN0WCY5udCK9lKz6UY1JrtuJNYnHY r15/iqfpXqklXDsw8ayjcjTzjeOPa+0yuWEbL6DdERzxwY/KzWAiZtn9jesxJx05lZgCVpHfOEH xgeKs5SBKglGb64xan13dtYe30jPvSMRQfHPhyLH/fXTIkJS4hteT4ZpMNUE/tAdWrhb9J/asHs RIXo6EWDQfbCfs23F9NC5mnPGQrf9gDsSYTkH7KsXQUgrGfWA9JmzzDcZC/ojE5/eGqaW6CdoGp IqsItuzIN6FeOUxlyXKn4bMG0a6gkjbZGQEC/2w1KqBMzTn/3QQF5grj7pls3efDjUkZHf9CU5n 55CRL7nFyM45zR/Q24L8+LhCx7fPPVmQf6o8ey468cr9BVhxkZ23hd6RudAMQ8RM9gqI+xniPCr fT/iJiv8A== X-Received: by 2002:a05:600c:699b:b0:485:3ee1:eba5 with SMTP id 5b1f17b1804b1-488998f09dbmr360376005e9.27.1775661943426; Wed, 08 Apr 2026 08:25:43 -0700 (PDT) Received: from [10.1.4.108] (cust-east-par-46-193-119-166.cust.wifirst.net. [46.193.119.166]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-488cd19a881sm300285e9.3.2026.04.08.08.25.42 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Wed, 08 Apr 2026 08:25:43 -0700 (PDT) Message-ID: <1040e6be-6223-4cfc-b603-e2dd90713bb7@gmail.com> Date: Wed, 8 Apr 2026 17:25:41 +0200 Precedence: bulk X-Mailing-List: devicetree@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v2] net: dsa: microchip: implement KSZ87xx Module 3 low-loss cable errata To: Andrew Lunn Cc: Woojung Huh , UNGLinuxDriver@microchip.com, Vladimir Oltean , "David S. Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Marek Vasut , Maxime Chevallier , netdev@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, Fidelio Lawson References: <20260408-ksz87xx_errata_low_loss_connections-v2-1-9cfe38691713@exotec.com> Content-Language: en-US From: Fidelio LAWSON In-Reply-To: Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit On 4/8/26 14:43, Andrew Lunn wrote: >> The control register defines the following modes: >> bits [1:0]: >> 00 = workaround disabled >> 01 = workaround 1 (DSP EQ training adjustment, LinkMD reg 0x3c) >> 10 = workaround 2 (receiver LPF bandwidth, LinkMD reg 0x4c) > > There was a comment, which i only read after making the suggestion to > use two bits, of exposing the different low pass filter bandwidths, > rather than just picking one value. How useful is that? > > Andrew Initially I limited the LPF setting to the single bandwidth explicitly recommended by the errata (62MHz). But I’ll extend the implementation to expose all documented LPF bandwidth options so the interface is more flexible for users. Best regards, Fidelio