diff options
| -rw-r--r-- | target/linux/imx6/patches-4.9/210-disable-uart-dma.patch | 23 |
1 files changed, 23 insertions, 0 deletions
diff --git a/target/linux/imx6/patches-4.9/210-disable-uart-dma.patch b/target/linux/imx6/patches-4.9/210-disable-uart-dma.patch new file mode 100644 index 0000000000..6abbb93301 --- /dev/null +++ b/target/linux/imx6/patches-4.9/210-disable-uart-dma.patch @@ -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; |