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[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: linux-kernel@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