ECSPI DMA support for MAX14830

surendradhobale — Wed, 03 Jan 2018 05:02:58 GMT

Hello,

As we facing the issue of the rxoverrun for spi-uart exapnder chip 14830, looking for the use of DMA for the same so that cpu overhead will reduce and communication will be faster.

Then we will check the ovevrrun is happening or not for MAX14830.

What could be the approach to use DMA ?

I have enabled dma for the ecspi. but still it using the pio mode in the spi-imx driver.

As max14830 is slave device in the communication, is we need to implement anything in max310x driver for the DMA burst mechanism ?

Please help.

Regards,
Surendra

Re: ECSPI DMA support for MAX14830

igorpadykov — Wed, 03 Jan 2018 07:43:26 GMT

Hi Surendra

sdma may not help with with overrun, recommended to use flow control.

As for spi dma support, it is not supported in nxp linux bsps according to attached Linux

Manual sect.4.1.2 Software Operation.

In general one can just follow documentation in linux/Documentation/devicetree/bindings/spi/fsl-imx-cspi.txt

linux-imx.git - i.MX Linux Kernel

Best regards
igor
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topic ECSPI DMA support for MAX14830 in i.MX Processors

ECSPI DMA support for MAX14830

Re: ECSPI DMA support for MAX14830