From mboxrd@z Thu Jan 1 00:00:00 1970 From: mkl@pengutronix.de (Marc Kleine-Budde) Date: Wed, 05 Nov 2014 15:29:37 +0100 Subject: [PATCH V3 3/3] can: m_can: workaround for transmit data less than 4 bytes In-Reply-To: <1415193393-30023-3-git-send-email-b29396@freescale.com> References: <1415193393-30023-1-git-send-email-b29396@freescale.com> <1415193393-30023-3-git-send-email-b29396@freescale.com> Message-ID: <545A3451.2090302@pengutronix.de> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org On 11/05/2014 02:16 PM, Dong Aisheng wrote: > At least on the i.MX6SX TO1.2 with M_CAN IP version 3.0.1, an issue with > the Message RAM was discovered. Sending CAN frames with dlc less > than 4 bytes will lead to bit errors, when the first 8 bytes of > the Message RAM have not been initialized (i.e. written to). > To work around this issue, the first 8 bytes are initialized in open() > function. > > Without the workaround, we can easily see the following errors: > root at imx6qdlsolo:~# ip link set can0 up type can bitrate 1000000 > [ 66.882520] IPv6: ADDRCONF(NETDEV_CHANGE): can0: link becomes ready > root at imx6qdlsolo:~# cansend can0 123#112233 > [ 66.935640] m_can 20e8000.can can0: Bit Error Uncorrected > > Signed-off-by: Dong Aisheng Applied to can/master Thanks, Marc -- Pengutronix e.K. | Marc Kleine-Budde | Industrial Linux Solutions | Phone: +49-231-2826-924 | Vertretung West/Dortmund | Fax: +49-5121-206917-5555 | Amtsgericht Hildesheim, HRA 2686 | http://www.pengutronix.de | -------------- next part -------------- A non-text attachment was scrubbed... Name: signature.asc Type: application/pgp-signature Size: 819 bytes Desc: OpenPGP digital signature URL: