Possible disable UART DMA?

[Anonymous]

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.

[Yuri]

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-process...

Have a great day,
Yuri

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[Anonymous]

Thanks Yuri.

[宗標廖]

Hello shao

Could you tell me how to diable UART DMA?

Best Regards

ZongbiaoLiao