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(Postfix) with ESMTPSA id F0D8458C02B; Fri, 6 Nov 2020 09:00:16 +0000 (UTC) To: Patrick Menschel , 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: Marc Kleine-Budde Autocrypt: addr=mkl@pengutronix.de; prefer-encrypt=mutual; keydata= mQINBFFVq30BEACtnSvtXHoeHJxG6nRULcvlkW6RuNwHKmrqoksispp43X8+nwqIFYgb8UaX zu8T6kZP2wEIpM9RjEL3jdBjZNCsjSS6x1qzpc2+2ivjdiJsqeaagIgvy2JWy7vUa4/PyGfx QyUeXOxdj59DvLwAx8I6hOgeHx2X/ntKAMUxwawYfPZpP3gwTNKc27dJWSomOLgp+gbmOmgc 6U5KwhAxPTEb3CsT5RicsC+uQQFumdl5I6XS+pbeXZndXwnj5t84M+HEj7RN6bUfV2WZO/AB 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0yCEJ41rW/p3UpTV9wwE2VbGD1XjzVKl8SuAUfjjcGGys3yk5XQ5cccWTCwsVdo2uAcY1MVM HhN6YJjnMqbFoHQq0H+2YenTlTBn2Wsp8TIytE1GL6EbaPWbMh3VLRcihlMj28OUWGSERxat xlygDG5cBiY3snN3xJyBroh5xk/sHRgOdHpmujnFyu77y4RTZ2W8 Subject: Re: mcp251xfd on RPi 5.4 downstream Message-ID: <40bf253b-fc66-0996-4ac9-08caaa249beb@pengutronix.de> Date: Fri, 6 Nov 2020 10:00:11 +0100 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.12.0 MIME-Version: 1.0 In-Reply-To: Content-Type: multipart/signed; micalg=pgp-sha512; protocol="application/pgp-signature"; boundary="pcZYk4qvoNSNisElNlkUd58LsRdaQyG6f" X-SA-Exim-Connect-IP: 2001:67c:670:201:5054:ff:fe8d:eefb X-SA-Exim-Mail-From: mkl@pengutronix.de X-SA-Exim-Scanned: No (on metis.ext.pengutronix.de); SAEximRunCond expanded to false X-PTX-Original-Recipient: linux-can@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-can@vger.kernel.org This is an OpenPGP/MIME signed message (RFC 4880 and 3156) --pcZYk4qvoNSNisElNlkUd58LsRdaQyG6f Content-Type: multipart/mixed; boundary="Q6Tqd0INi7LBgBDl0lYWfDfOytMdhXHOk"; protected-headers="v1" From: Marc Kleine-Budde To: Patrick Menschel , drew@beagleboard.org Cc: socketcan@hartkopp.net, linux-can@vger.kernel.org, josh@macchina.cc Message-ID: <40bf253b-fc66-0996-4ac9-08caaa249beb@pengutronix.de> Subject: Re: mcp251xfd on RPi 5.4 downstream 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> In-Reply-To: --Q6Tqd0INi7LBgBDl0lYWfDfOytMdhXHOk Content-Type: text/plain; charset=utf-8 Content-Language: de-DE Content-Transfer-Encoding: quoted-printable On 11/5/20 7:11 PM, Patrick Menschel wrote: >>> Its just a bread board install and I had to reduce the Spi-Max-Freque= ncy >>> due to 10cm long cables. It least I believe it's the cable length. >> >> What happens if you don't reduce the SPI frequency? >=20 > CRC Errors above 16Mhz spi frequency. Ok - Which SoC are you using? rpi4? Marc --=20 Pengutronix e.K. | Marc Kleine-Budde | Embedded Linux | https://www.pengutronix.de | Vertretung West/Dortmund | Phone: +49-231-2826-924 | Amtsgericht Hildesheim, HRA 2686 | Fax: +49-5121-206917-5555 | --Q6Tqd0INi7LBgBDl0lYWfDfOytMdhXHOk-- --pcZYk4qvoNSNisElNlkUd58LsRdaQyG6f Content-Type: application/pgp-signature; name="signature.asc" Content-Description: OpenPGP digital signature Content-Disposition: attachment; filename="signature.asc" -----BEGIN PGP SIGNATURE----- iQEzBAEBCgAdFiEEK3kIWJt9yTYMP3ehqclaivrt76kFAl+lEJwACgkQqclaivrt 76lj2wf/RiWiutAWTSRxilyQusiKRORaqc9ZelxOXxrcLD8+l4UEXl7HEeSSUt+b kz7W7/CO6kwq1BP9tUxM3tu0nIzbIrGmyIe/7jIGPB4DjR3Qts5efZbi4Rnfaiad tTvd0najcH489SOUJKJqoGDV3kSe2yOiFXsKLmff1LSdxQ+Hlhxf9HZTklS9GgjT 06zZyeOb7/468c4mt5cnPrcBeFsg4MkTlBYb0a/1JXZ8tjvJNE0dUGvwsQrVxPfI Pfo3isFqAiqi39u4GGW/Urr0sBjLBMv+7wkeZDsAw57bXCrqHxAPEyxVq+K+UCKD DQoP62xp/XyLe+DR2V2L0dYHYH1sTw== =7IkY -----END PGP SIGNATURE----- --pcZYk4qvoNSNisElNlkUd58LsRdaQyG6f--