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- 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;
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