On 10/12/20 2:22 PM, Kurt Van Dijck wrote: > On Fri, 09 Oct 2020 19:40:57 +0200, Kurt Van Dijck wrote: >> On Fri, 09 Oct 2020 18:24:02 +0200, Marc Kleine-Budde wrote: >>> On 10/9/20 4:16 PM, Kurt Van Dijck wrote: >>>> Any ideas what to look for? >>> >>> The mcp2517fd suffers from the MAB TX underflow errata: See 1. in >>> http://ww1.microchip.com/downloads/en/DeviceDoc/MCP2517FD-External-CAN-FD-Controller-with-SPI-Interface-20005688B.pdf >>> >>> Compile the driver with "#define DEBUG" or remove the >>> "MCP251XFD_QUIRK_MAB_NO_WARN" from the mcp251xfd_devtype_data_mcp2517fd. Then >>> you should see an error message when the chip switches modes due to the MAB >>> underrun. >> I'll do this. > > Yep, TX MAB underflow it is. There's not much you can do against it...use a mcp2518fd. Maybe implementing busy polling for spi transaction completion would bring a slight improvement here....but that imx spi driver is a bit messy. Marc -- 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 |
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