i.MX ProcessorsのトピックRe: Dma interrupts

Dma interrupts

garydommer — Wed, 27 Sep 2017 18:42:24 GMT

I have a pcie card mini adapter plugged into a Boundary Devices Nitrogen6 carrier board. the pcie device is a Linear Systems Ttd. SDI Tx card. I got the driver to run however, after some dma buffer transfers the dma done indication as well as the completion interrupt stops. The driver then fills the dma ring and shuts down exiting the test application. At this point the dma will not restarte unless I reboot the system.

Re: Dma interrupts

igorpadykov — Wed, 27 Sep 2017 23:25:57 GMT

Hi Gary

basic pcie validation steps are described in

i.MX6Q PCIe EP/RC Validation System

please check that for Nitrogen6 correct image configuration is used

GitHub - boundarydevices/linux-imx6: Boundary Devices Kernel tree for i.MX6

as this is third party board, issue may be posted on meta-fsl-arm mailing list, so that someone

familiar with it could try to assist you.
https://lists.yoctoproject.org/listinfo/meta-freescale

Best regards
igor
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Re: Dma interrupts

garydommer — Thu, 28 Sep 2017 14:52:31 GMT

Thankyou Igor. I have submitted subscription request.

All the best,

Gary

Re: Dma interrupts

wolfgang_muees — Mon, 16 Oct 2017 13:12:36 GMT

in imx-sdma.c, function

static irqreturn_t sdma_int_handler(int irq, void *dev_id)

replace

if (sdmac->flags & IMX_DMA_SG_LOOP)
sdma_update_channel_loop(sdmac);
else
tasklet_schedule(&sdmac->tasklet);

with

if (sdmac->flags & IMX_DMA_SG_LOOP)
sdma_update_channel_loop(sdmac);
else

mxc_sdma_handle_channel_normal((unsigned long)sdmac);