From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mx.nabladev.com (mx.nabladev.com [178.251.229.89]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 6107E3F2115; Wed, 20 May 2026 15:08:30 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=178.251.229.89 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1779289711; cv=none; b=jxNS3nXAwtCYBMcCO2uvByl8ucjY5ruGXDntOW4kbSbfPMjKcHm4FVq8ALiFXXot+HJUrTniT0B+luO9IDFKjJAoJ9OJ2lxNXe1M1wGI52MdBjEJ3CKMxYc/7RjXKQrNRUq5r5sNe6Hbb3KFdj46GEMFPJZiRub4sBJ3ug2Lq0M= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1779289711; c=relaxed/simple; bh=iwd3bci6J9zZ/APhwbGkT4+SLwwRy7nxJaMUKZ6Llhs=; h=Message-ID:Date:MIME-Version:Subject:To:Cc:References:From: In-Reply-To:Content-Type; b=LxfuVr++E2Vv97pbzamhZ0aY2qQkoer1HGdDg4NxcjHXVS/1TRte7yQxdPMgA/ocqlLA5dykfcQKot3bpPQbhjptR63OQJc3zVXopMJzCEatOhW+RPF5TDe0tvzxlC08kgg8gLeE9sf+t9eEswWeEyhY7xntq5AyimaN+rtezDU= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=nabladev.com; spf=pass smtp.mailfrom=nabladev.com; dkim=pass (2048-bit key) header.d=nabladev.com header.i=@nabladev.com header.b=SuR9font; arc=none smtp.client-ip=178.251.229.89 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=nabladev.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=nabladev.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=nabladev.com header.i=@nabladev.com header.b="SuR9font" Received: from [127.0.0.1] (localhost [127.0.0.1]) by localhost (Mailerdaemon) with ESMTPSA id 96C481159AD; Wed, 20 May 2026 17:08:21 +0200 (CEST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=nabladev.com; s=dkim; t=1779289702; h=from:subject:date:message-id:to:cc:mime-version:content-type: content-transfer-encoding:content-language:in-reply-to:references; bh=KMPZHz8s3zuc5m+dAfGa9Et6A0mOFmoCxo6Io4kBoF8=; b=SuR9font6MHtd+7tPWA71YbkN/j6M95XUhmz87Rbli53iYYC9pksQx5LvYiyTqL1erQoVE ZQ2NULqwpLJ1RrL2DATKmF8kyy9NptEJ24ZBpKX26CaZPI90otqcqMBqjcUhn8FmfRzVs7 Ezb8GkO4Y1y46Axbu+BG4gMltRxsDxLs5VUp9l6a68kyuc/D/gn9MOze6Sqfox2XFD1kZQ 5HW5N80AIkPX8DwaVI66mL9E5wECPz2xDdiqA94Lckkd2KdY67gRwDEy1u3zFcH2uN5b/h xmHvTvK+N0Wh4+Is9nhGyOGGFUN5cB3MlUsS6SQCihgz3bDBtkj/nraX4oxBZA== Message-ID: Date: Wed, 20 May 2026 13:53:31 +0200 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v6 2/3] net: ethtool: add KSZ87xx low-loss cable PHY tunables To: Fidelio Lawson , Woojung Huh , UNGLinuxDriver@microchip.com, Andrew Lunn , Vladimir Oltean , "David S. Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , Marek Vasut , Maxime Chevallier , Simon Horman , Heiner Kallweit , Russell King , Tristram Ha Cc: netdev@vger.kernel.org, linux-kernel@vger.kernel.org, Fidelio Lawson References: <20260520-ksz87xx_errata_low_loss_connections-v6-0-43f33d4aaf0f@exotec.com> <20260520-ksz87xx_errata_low_loss_connections-v6-2-43f33d4aaf0f@exotec.com> Content-Language: en-US From: Marek Vasut In-Reply-To: <20260520-ksz87xx_errata_low_loss_connections-v6-2-43f33d4aaf0f@exotec.com> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-Last-TLS-Session-Version: TLSv1.3 On 5/20/26 10:48 AM, Fidelio Lawson wrote: > Introduce vendor-specific PHY tunable identifiers to control the > KSZ87xx low-loss cable erratum handling through the ethtool PHY > tunable interface. > > The following tunables are added: > > - a boolean "short-cable" tunable, applying a documented and > conservative preset intended for short or low-loss Ethernet cables; > > - an integer LPF bandwidth tunable, allowing advanced adjustment of the > receiver low-pass filter bandwidth; > > - an integer DSP EQ initial value tunable, allowing advanced tuning of > the PHY equalizer initialization. > > The actual behavior is implemented by the corresponding PHY and switch > drivers. > > Signed-off-by: Fidelio Lawson Reviewed-by: Marek Vasut