[LEDE-DEV] [PATCH] imx6: disable dma on uart

[Felix Fietkau]

On 2018-03-08 11:00, Koen Vandeputte wrote:
> 
> 
> On 2018-02-22 12:44, Felix Fietkau wrote:
>> On 2018-02-22 12:20, Koen Vandeputte wrote:
>>> When this target got updated to 4.14, this patch got removed to
>>> re-evaluate if it was still needed.
>>>
>>> Extensive testing now shows this issue is still present.
>>> Let's re-add the patch to fix it for now.
>>>
>>> As the uart bus is very low bandwidth .. performance impact is negligible.
>>>
>>> Boot log:
>>>
>>> [   22.513051] imx-uart 2020000.serial: DMA transaction error.
>>> [   22.522721] imx-uart 2020000.serial: DMA transaction error.
>>>
>>> As a sidenote:
>>> The patch mentiones an issue with RS485, but the bootlog
>>> errors above were recorded with the uart ports in standard RS232 mode.
>>>
>>> Compile/Run-tested on imx6/GW5200
>>>
>>> Signed-off-by: Koen Vandeputte <koen.vandeputte at ncentric.com>
>> Could you please also report this issue upstream and send a patch that
>> makes it possible to disable DMA via DT and/or kconfig?
> Bugreport was filed some time ago [1]
> No response so far ..
Did you send it to the relevant mailing lists as well?

- Felix