imx6: disable dma on uart

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@ncentric.com>
This commit is contained in:
Koen Vandeputte 2018-02-22 12:20:16 +01:00 committed by Felix Fietkau
parent aad1f11efe
commit efb362cd93

View file

@ -0,0 +1,23 @@
Based on following upstream patch by Tim Harvey (Gateworks):
https://github.com/Gateworks/openwrt/commit/80a01b6582f94c4547f39d3a25e0a1e9b6eb9877
TX complete DMA messages are getting missed.
This is also currently an issue in mainline.
For now we will disable DMA in serial/imx.c.
This resolves an issue encountered with RS485 transmit.
--- a/drivers/tty/serial/imx.c
+++ b/drivers/tty/serial/imx.c
@@ -1268,10 +1268,6 @@ static int imx_startup(struct uart_port
writel(temp & ~UCR4_DREN, sport->port.membase + UCR4);
- /* Can we enable the DMA support? */
- if (!uart_console(port) && !sport->dma_is_inited)
- imx_uart_dma_init(sport);
-
spin_lock_irqsave(&sport->port.lock, flags);
/* Reset fifo's and state machines */
i = 100;