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.vandepu...@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
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