topic Possible disable UART DMA? in i.MX Processors

Possible disable UART DMA?

Anonymous — Thu, 28 Apr 2016 12:43:27 GMT

Hello:

I'm using Android kernel 3.10.53, my touchpad is penmount-6000 Serial-Port touch controller,

but Penmount controller work fine at UART DMA disabled..

in kernel driver code, DMA is always enable:

if (sport->dma_is_inited && !sport->dma_is_enabled) {

imx_enable_dma(sport);

start_rx_dma(sport);

}

bu when I tried to disable DMA, causing many UART RX-FIFO error:

imx-uart 21f4000.serial: Rx FIFO overrun

Does possible disable UART DMA? thanks.

Re: Possible disable UART DMA?

Yuri — Fri, 29 Apr 2016 05:55:50 GMT

Hello,

According to "i.MX_6_Linux_Reference_Manual.pdf" of Linux L3.10.53,

each UART can be configured to use DMA for the data transfer by enabling the DMA

channel in the DTS file.

Please refer documentation to more details.

The documentation may be found at

http://www.nxp.com/products/microcontrollers-and-processors/arm-processors/i.mx-applications-processors/i.mx-6-processors/i.mx6qp/i.mx-6-series-software-and-development-tool-resources:IMX6_SW

Have a great day,
Yuri

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Re: Possible disable UART DMA?

Anonymous — Fri, 29 Apr 2016 06:05:07 GMT

Thanks Yuri.

Re: Possible disable UART DMA?

宗標廖 — Mon, 06 Mar 2017 01:27:43 GMT

Hello shao

Could you tell me how to diable UART DMA?

Best Regards

ZongbiaoLiao