RE: Issues with i.MX SPI DMA transfers

[Robin Gong]

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@xxxxxxxxx>
> Sent: 2019å3æ28æ 15:04
> To: Uwe Kleine-KÃnig <u.kleine-koenig@xxxxxxxxxxxxxx>
> Cc: linux-kernel@xxxxxxxxxxxxxxx; linux-arm-kernel@xxxxxxxxxxxxxxxxxxx;
> linux-spi@xxxxxxxxxxxxxxx; dl-linux-imx <linux-imx@xxxxxxx>; Fabio Estevam
> <festevam@xxxxxxxxx>; Pengutronix Kernel Team <kernel@xxxxxxxxxxxxxx>;
> Sascha Hauer <s.hauer@xxxxxxxxxxxxxx>; Shawn Guo
> <shawnguo@xxxxxxxxxx>; Mark Brown <broonie@xxxxxxxxxx>;
> dmaengine@xxxxxxxxxxxxxxx; Vinod Koul <vkoul@xxxxxxxxxx>; Dan Williams
> <dan.j.williams@xxxxxxxxx>; Andy Duan <fugang.duan@xxxxxxx>; Han Xu
> <han.xu@xxxxxxx>; Robin Gong <yibin.gong@xxxxxxx>; Clark Wang
> <xiaoning.wang@xxxxxxx>
> 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
> >>  Â[ 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

Attachment: 0001-dma-engine-imx-sdma-add-mcu_2_ecspi-script.patch
Description: 0001-dma-engine-imx-sdma-add-mcu_2_ecspi-script.patch

Attachment: 0002-spi-spi-imx-fix-ERR009165.patch
Description: 0002-spi-spi-imx-fix-ERR009165.patch