linux-kernel - RE: Issues with i.MX SPI DMA transfers

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Date:   Thu, 28 Mar 2019 09:23:41 +0000
From:   Robin Gong <yibin.gong@....com>
To:     Igor Plyatov <plyatov@...il.com>,
        Uwe Kleine-König 
        <u.kleine-koenig@...gutronix.de>
CC:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "linux-spi@...r.kernel.org" <linux-spi@...r.kernel.org>,
        dl-linux-imx <linux-imx@....com>,
        Fabio Estevam <festevam@...il.com>,
        Pengutronix Kernel Team <kernel@...gutronix.de>,
        Sascha Hauer <s.hauer@...gutronix.de>,
        Shawn Guo <shawnguo@...nel.org>,
        Mark Brown <broonie@...nel.org>,
        "dmaengine@...r.kernel.org" <dmaengine@...r.kernel.org>,
        Vinod Koul <vkoul@...nel.org>,
        Dan Williams <dan.j.williams@...el.com>,
        Andy Duan <fugang.duan@....com>, Han Xu <han.xu@....com>,
        Clark Wang <xiaoning.wang@....com>
Subject: RE: Issues with i.MX SPI DMA transfers

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@...il.com>
> Sent: 2019年3月28日 15:04
> To: Uwe Kleine-König <u.kleine-koenig@...gutronix.de>
> Cc: linux-kernel@...r.kernel.org; linux-arm-kernel@...ts.infradead.org;
> linux-spi@...r.kernel.org; dl-linux-imx <linux-imx@....com>; Fabio Estevam
> <festevam@...il.com>; Pengutronix Kernel Team <kernel@...gutronix.de>;
> Sascha Hauer <s.hauer@...gutronix.de>; Shawn Guo
> <shawnguo@...nel.org>; Mark Brown <broonie@...nel.org>;
> dmaengine@...r.kernel.org; Vinod Koul <vkoul@...nel.org>; Dan Williams
> <dan.j.williams@...el.com>; Andy Duan <fugang.duan@....com>; Han Xu
> <han.xu@....com>; Robin Gong <yibin.gong@....com>; Clark Wang
> <xiaoning.wang@....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


Download attachment "0001-dma-engine-imx-sdma-add-mcu_2_ecspi-script.patch" of type "application/octet-stream" (1369 bytes)

Download attachment "0002-spi-spi-imx-fix-ERR009165.patch" of type "application/octet-stream" (1280 bytes)