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

[Koen Vandeputte]

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 ..
> Thanks,
>
> - Felix


[1] https://bugzilla.kernel.org/show_bug.cgi?id=198889