3b4241071d
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>
23 lines
747 B
Diff
23 lines
747 B
Diff
Based on following upstream patch by Tim Harvey (Gateworks):
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https://github.com/Gateworks/openwrt/commit/80a01b6582f94c4547f39d3a25e0a1e9b6eb9877
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TX complete DMA messages are getting missed.
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This is also currently an issue in mainline.
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For now we will disable DMA in serial/imx.c.
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This resolves an issue encountered with RS485 transmit.
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--- a/drivers/tty/serial/imx.c
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+++ b/drivers/tty/serial/imx.c
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@@ -1268,10 +1268,6 @@ static int imx_startup(struct uart_port
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writel(temp & ~UCR4_DREN, sport->port.membase + UCR4);
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- /* Can we enable the DMA support? */
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- if (!uart_console(port) && !sport->dma_is_inited)
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- imx_uart_dma_init(sport);
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-
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spin_lock_irqsave(&sport->port.lock, flags);
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/* Reset fifo's and state machines */
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i = 100;
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