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SubjectRE: Issues with i.MX SPI DMA transfers
Date
Hi Igor,
Please have a try with the attached patch, assume you have already used the sdma firmware
From https://git.kernel.org/pub/scm/linux/kernel/git/firmware/linux-firmware.git/tree/imx/sdma/sdma-imx6q.bin
> -----Original Message-----
> From: Igor Plyatov <plyatov@gmail.com>
> Sent: 2019年3月28日 15:04
> To: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
> Cc: linux-kernel@vger.kernel.org; linux-arm-kernel@lists.infradead.org;
> linux-spi@vger.kernel.org; dl-linux-imx <linux-imx@nxp.com>; Fabio Estevam
> <festevam@gmail.com>; Pengutronix Kernel Team <kernel@pengutronix.de>;
> Sascha Hauer <s.hauer@pengutronix.de>; Shawn Guo
> <shawnguo@kernel.org>; Mark Brown <broonie@kernel.org>;
> dmaengine@vger.kernel.org; Vinod Koul <vkoul@kernel.org>; Dan Williams
> <dan.j.williams@intel.com>; Andy Duan <fugang.duan@nxp.com>; Han Xu
> <han.xu@nxp.com>; Robin Gong <yibin.gong@nxp.com>; Clark Wang
> <xiaoning.wang@nxp.com>
> Subject: Re: Issues with i.MX SPI DMA transfers
>
> Dear Uwe,
>
>
> > Hello Igor,
> >
> > On Wed, Mar 27, 2019 at 08:40:00PM +0300, Igor Plyatov wrote:
> >> please, help to resolve two issues with SPI DMA transfers at i.MX6Q
> >> platform.
> >>
> >> First issue is
> >>  [ 4465.008003] spi_master spi0: I/O Error in DMA RX
> >>
> >> Second issue is duplication for one of received bytes.
> >>
> >> Probably, these issues related to each one.
> > This is probably the same problem I hit some time ago. Check ERR009165
> > in the errata. You either need to disable DMA or need a fixed
> > sdma-Script.
>
> disabling of DMA is not an option, because high throughput required for SPI bus
> to communicate with DSPs.
>
> I'm aware of ERR009165, but as I write some minutes earlier to list,
> spi0 (alias for ecspi1) and spi1 (alias for ecspi2) work flawless, while
> spi4 (alias for ecspi5) fails very fast.
>
> Does same SDMA script used for all SPI interfaces or scripts are different?
>
> Best wishes.
>
> --
>
> Igor Plyatov

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