Hi Robin, On Wed, Apr 7, 2021 at 4:15 AM Robin Gong <yibin.gong@xxxxxxx> wrote: > > There is ecspi ERR009165 on i.mx6/7 soc family, which cause FIFO > transfer to be send twice in DMA mode. Please get more information from: > https://www.nxp.com/docs/en/errata/IMX6DQCE.pdf. The workaround is adding > new sdma ram script which works in XCH mode as PIO inside sdma instead > of SMC mode, meanwhile, 'TX_THRESHOLD' should be 0. The issue should be > exist on all legacy i.mx6/7 soc family before i.mx6ul. > NXP fix this design issue from i.mx6ul, so newer chips including i.mx6ul/ > 6ull/6sll do not need this workaroud anymore. All other i.mx6/7/8 chips > still need this workaroud. This patch set add new 'fsl,imx6ul-ecspi' > for ecspi driver and 'ecspi_fixed' in sdma driver to choose if need errata > or not. > The first two reverted patches should be the same issue, though, it > seems 'fixed' by changing to other shp script. Hope Sean or Sascha could > have the chance to test this patch set if could fix their issues. > Besides, enable sdma support for i.mx8mm/8mq and fix ecspi1 not work > on i.mx8mm because the event id is zero. > > PS: > Please get sdma firmware from below linux-firmware and copy it to your > local rootfs /lib/firmware/imx/sdma. > https://git.kernel.org/pub/scm/linux/kernel/git/firmware/linux-firmware.git/tree/imx/sdma Without this series, SPI DMA does not work on i.MX8MM: [ 41.315984] spi_master spi1: I/O Error in DMA RX I applied your series and SPI DMA works now: Reviewed-by: Fabio Estevam <festevam@xxxxxxxxx> Thanks
