From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-5.3 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI, NICE_REPLY_A,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_SANE_1 autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 9C0B0C2D0A3 for ; Fri, 6 Nov 2020 11:31:24 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id D5D19206B2 for ; Fri, 6 Nov 2020 11:31:23 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=posteo.de header.i=@posteo.de header.b="ET2bJjbL" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727050AbgKFLbX (ORCPT ); Fri, 6 Nov 2020 06:31:23 -0500 Received: from mout02.posteo.de ([185.67.36.66]:55113 "EHLO mout02.posteo.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726925AbgKFLbW (ORCPT ); Fri, 6 Nov 2020 06:31:22 -0500 Received: from submission (posteo.de [89.146.220.130]) by mout02.posteo.de (Postfix) with ESMTPS id 2D4492400FD for ; Fri, 6 Nov 2020 12:31:20 +0100 (CET) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=posteo.de; s=2017; t=1604662280; bh=/W6Xui8vhRbAAJHTdQfYEH56u40sq4B3gG2uwZVt0x0=; h=Subject:To:Cc:From:Autocrypt:Date:From; b=ET2bJjbLp+Bc5NTT/sqFSTr3+Wt/Elk9e0Hr3SZW9qT9CP1n4LLv/TPihisScksdJ c4KwF0ObS+G0Sp24CsHcfZR7CnSqGKEWD9CfRDcqDez/eTzS4OHj1GlbQX3Ys0c4aa 4t3eeIjvT+JluDcw5EgHvAWCk0NU/dtbOlblTJfntL7UlV5FAmrZ06BAHVtCjTVFBW tWDM7z22151oVSoYDK41KEYT4Mb9KCwwi9PcdCqpWcwfd7lQgmz93rt6tzHqqSLjkl s3yyoJVNTRD4l7TYn4aimlRPYkzPK4dKnPRCtBaEzSyum55liDby0f48drtMyWKyEG usR4Cjq8xgorA== Received: from customer (localhost [127.0.0.1]) by submission (posteo.de) with ESMTPSA id 4CSJ9z2Sprz9rxj; Fri, 6 Nov 2020 12:31:19 +0100 (CET) Subject: Re: mcp251xfd on RPi 5.4 downstream To: Marc Kleine-Budde , drew@beagleboard.org Cc: socketcan@hartkopp.net, linux-can@vger.kernel.org, josh@macchina.cc References: <3d19330b-860b-7d76-bc6d-768a7b00ed4b@pengutronix.de> <3a5f81d6-13ba-71b8-67a7-fe6e8a13f84a@posteo.de> <3b7b6353-0493-210a-7c14-e7ccc1067365@pengutronix.de> <08a1fb36-5efb-27d8-f5b9-bd2a923479a2@pengutronix.de> <9e9db79d-9357-19bd-0584-3f97ed49c731@posteo.de> <27b696e7-2c05-e8f3-ca3e-d30ceb11a818@posteo.de> <1082be86-50d6-40f3-ec44-18d389fd9245@posteo.de> <8bf56109-5e53-ca76-c022-99cf867322a6@pengutronix.de> <40bf253b-fc66-0996-4ac9-08caaa249beb@pengutronix.de> From: Patrick Menschel Autocrypt: addr=menschel.p@posteo.de; 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Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.10.0 MIME-Version: 1.0 In-Reply-To: <40bf253b-fc66-0996-4ac9-08caaa249beb@pengutronix.de> Content-Type: text/plain; charset=utf-8 Content-Language: de-DE Content-Transfer-Encoding: 7bit Precedence: bulk List-ID: X-Mailing-List: linux-can@vger.kernel.org > On 11/5/20 7:11 PM, Patrick Menschel wrote: >>>> Its just a bread board install and I had to reduce the Spi-Max-Frequency >>>> due to 10cm long cables. It least I believe it's the cable length. >>> >>> What happens if you don't reduce the SPI frequency? >> >> CRC Errors above 16Mhz spi frequency. > > Ok - Which SoC are you using? rpi4? > > Marc > https://www.raspberrypi.org/products/raspberry-pi-zero-w/ -- Patrick