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=-5.4 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,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 CAA90C55178 for ; Thu, 5 Nov 2020 18:11:35 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 5FAF820709 for ; Thu, 5 Nov 2020 18:11:35 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=posteo.de header.i=@posteo.de header.b="VrvHbbQM" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1731826AbgKESLd (ORCPT ); Thu, 5 Nov 2020 13:11:33 -0500 Received: from mout01.posteo.de ([185.67.36.65]:34597 "EHLO mout01.posteo.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725862AbgKESLb (ORCPT ); Thu, 5 Nov 2020 13:11:31 -0500 Received: from submission (posteo.de [89.146.220.130]) by mout01.posteo.de (Postfix) with ESMTPS id 0EB93160061 for ; Thu, 5 Nov 2020 19:11:28 +0100 (CET) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=posteo.de; s=2017; t=1604599889; bh=fdc1RGu9X5Jywm6UTBcRiKN56sHlxqWlZJxrrMbamg0=; h=To:Cc:From:Autocrypt:Subject:Date:From; b=VrvHbbQMT9Qjfad5BqpTBJV8FfB1jloVrwtF3cI+szWkaNQQJuwsMhPncbFEvCzYC uGFdJwQca5mDpA9olvs3wRjyvvkN4U9i0aSIIMXiVYepcAVVzBjIaIq4eHwwIrnwd5 eeb3NOhvabiOcp08PNG4+DYY2EvK01Db1kAW5l1q4c0b229bPvbQedeDZ0/Vibzu4N bJ7/xHHSHwkdRFQtIffm+dq9LF2vKFIfaeHagws7skLnf+11yMrs1X9cJGTzfxRoz7 8QIHV7PfWcmVs+tVrlXyXL/bhE17auDl22v1gKy2xK7EuPiZTKgkUJaOB5/xpqG6b2 uddDtfnLSxcIQ== Received: from customer (localhost [127.0.0.1]) by submission (posteo.de) with ESMTPSA id 4CRs6814l5z9rxn; Thu, 5 Nov 2020 19:11:28 +0100 (CET) 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> 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: <8bf56109-5e53-ca76-c022-99cf867322a6@pengutronix.de> Content-Type: text/plain; charset=utf-8 Content-Language: de-DE Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-can@vger.kernel.org >> 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. ## No limit $ dmesg | grep -Ei can\|spi [ 30.006596] CAN device driver interface [ 30.276213] spi_master spi0: will run message pump with realtime priority [ 30.436807] mcp251xfd spi0.0 (unnamed net_device) (uninitialized): CRC read error at address 0x0000 (length=4, data=00 07 18 04, CRC=0xb29d). [ 30.436835] mcp251xfd spi0.0 (unnamed net_device) (uninitialized): Controller failed to enter mode Configuration Mode (4) and stays in Internal Loopback Mode (2). [ 30.437036] mcp251xfd spi0.0 (unnamed net_device) (uninitialized): CRC read error at address 0x0000 (length=4, data=00 07 18 04, CRC=0xb29d). [ 30.437261] mcp251xfd: probe of spi0.0 failed with error -74 ## 18Mhz $ dmesg | grep -Ei can\|spi [ 30.345967] CAN device driver interface [ 30.503372] spi_master spi0: will run message pump with realtime priority [ 30.542854] mcp251xfd spi0.0 (unnamed net_device) (uninitialized): CRC read error at address 0x0000 (length=4, data=60 07 18 04, CRC=0xb28c). [ 30.543057] mcp251xfd spi0.0 (unnamed net_device) (uninitialized): CRC read error at address 0x0000 (length=4, data=60 07 18 04, CRC=0xb28c). [ 30.543286] mcp251xfd: probe of spi0.0 failed with error -74 ## 16Mhz $ dmesg | grep -Ei can\|spi [ 29.496863] CAN device driver interface [ 30.028215] spi_master spi0: will run message pump with realtime priority [ 30.171532] mcp251xfd spi0.0 can0: MCP2517FD rev0.0 (-RX_INT +MAB_NO_WARN +CRC_REG +CRC_RX +CRC_TX +ECC -HD c:40.00MHz m:16.00MHz r:16.00MHz e:0.00MHz) successfully initialized. -- Patrick