> -----Original Message----- > From: Igor Plyatov <plyatov@xxxxxxxxx> > Sent: 2019年4月2日 15:20 > To: Robin Gong <yibin.gong@xxxxxxx>; Uwe Kleine-König > <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>; Clark Wang <xiaoning.wang@xxxxxxx> > Subject: Re: Issues with i.MX SPI DMA transfers > > Dear Robin Gong, > > > >> Sorry...below another sdma patch(ad0d92d7ba6a) need to be reverted, > >> because spi driver may dynamically change burst length. > > > now I have reverted patch ad0d92d7ba6a. > > Patches 0001-dma-engine-imx-sdma-add-mcu_2_ecspi-script.patch and > 0002-spi-spi-imx-fix-ERR009165.patch are applied. > > > Kernel log show messages > > [ 29.202639] imx-sdma 20ec000.sdma: loaded firmware 3.3 > [ 29.238595] spi_imx 2008000.spi: probed > [ 29.242802] spi_imx 200c000.spi: probed > [ 29.245217] spi_imx 2018000.spi: probed > > SPI DMA transfers still not work. > > If I test 32 byte transfers, then they work fine. But 64 byte transfers > fails always and I see error messages > > root@cr7:~# spidev_test -D /dev/spidev4.1 -s 1200000 -b 8 -S 64 -I 1 -l > spi mode: 0x20 > bits per word: 8 > max speed: 1200000 Hz (1200 KHz) > [ 423.686736] spi_master spi4: I/O Error in DMA RX > [ 423.691392] spidev spi4.1: SPI transfer failed: -110 > [ 423.696382] spi_master spi4: failed to transfer one message from queue > can't send spi message: Connection timed out > Aborted (core dumped) > > I suppose, transfers shorter then 64 bytes made with help of PIO. > > Robin, is there any chance for you to find some time and look at this > issue again? I have quick test with spidev_test loopback, but didn't meet your error, Is your code the almost latest code in linux-next as mine? root@imx6qpdlsolox:~# cat /proc/interrupts | grep sdma 48: 37 GPC 2 Level sdma -lt@imx6qpdlsolox:~# ./spidev_test -D /dev/spidev0.0 -s 1200000 -b 8 -S 64 -I 1 -l spi mode: 0x20 bits per word: 8 max speed: 1200000 Hz (1200 KHz) root@imx6qpdlsolox:~# cat /proc/interrupts | grep sdma 48: 43 GPC 2 Level sdma ./spidev_test -D /dev/spidev0.0 -s 1200000 -b 8 -S 512 -I 1 -l spi mode: 0x20 bits per word: 8 max speed: 1200000 Hz (1200 KHz) total: tx 0.5KB, rx 0.5KB > > Best wishes. > -- > Igor Plyatov
