From mboxrd@z Thu Jan 1 00:00:00 1970 From: =?UTF-8?Q?Sean_Nyekj=c3=a6r?= Subject: imx spi performance Date: Wed, 9 Mar 2016 09:26:31 +0100 Message-ID: <56DFDE37.9060606@prevas.dk> Mime-Version: 1.0 Content-Type: text/plain; charset="utf-8"; format=flowed Content-Transfer-Encoding: 7bit Cc: To: Return-path: Sender: linux-spi-owner-u79uwXL29TY76Z2rM5mHXA@public.gmane.org List-ID: Hi We are getting a very low throughput with the imx6q and the spi interface :-( I have tried both with gpio CS and HW CS. With gpio CS: I have a imx6q hooked up to 4x spi uarts(sc16is750) running 4MHz, using 2 spi channels and 4 chipselects. With HW flowcontrol @ 115200 8n1, and full duplex on all 4 uarts, we are getting a maximum throughput of 69841 bits/sec. That to me seems very slow. With HW CS: It does not seem to work as CS is shifted for every BITS_PER_WORD and that is not compliant with most spi devices. Does someone have any ideas we can try to boost the performance. /Sean -- To unsubscribe from this list: send the line "unsubscribe linux-spi" in the body of a message to majordomo-u79uwXL29TY76Z2rM5mHXA@public.gmane.org More majordomo info at http://vger.kernel.org/majordomo-info.html