Fixes these prints on boot:
[ 13.785600] imx-uart 2020000.serial: DMA transaction error.
[ 13.793134] imx-uart 2020000.serial: DMA transaction error.
[ 13.798721] imx-uart 2020000.serial: DMA transaction error.
Based on following upstream patch by Tim Harvey (Gateworks):
80a01b6582
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.
Signed-off-by: Koen Vandeputte <koen.vandeputte@ncentric.com>
The IMX6 PCIe host controller does not fire legacy interrupts if MSI is
enabled. A patch is being worked on to enable MSI at runtime only when
it is needed but meanwhile this patch will disable MSI for the imx6 kernel.
This fixes the no interrupt issue on cards/drivers that use legacy interrupts
such as ath9k.
Signed-off-by: Tim Harvey <tharvey@gateworks.com>
Tested-by: Koen Vandeputte <koen.vandeputte@ncentric.com>
