serial: imx: initialized DMA w/o HW flow enabled
DMA mode for UART can be used even w/o HW flow control with RTS/CTS.
So it need to be initialized and enabled earlier.
Signed-off-by: Anton Bondarenko <anton_bondarenko@mentor.com>
Signed-off-by: Jiada Wang <jiada_wang@mentor.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
diff --git a/drivers/tty/serial/imx.c b/drivers/tty/serial/imx.c
index d097169..ab958a5 100644
--- a/drivers/tty/serial/imx.c
+++ b/drivers/tty/serial/imx.c
@@ -1141,12 +1141,20 @@
while (!(readl(sport->port.membase + UCR2) & UCR2_SRST) && (--i > 0))
udelay(1);
+ /* Can we enable the DMA support? */
+ if (is_imx6q_uart(sport) && !uart_console(port) &&
+ !sport->dma_is_inited)
+ imx_uart_dma_init(sport);
+
spin_lock_irqsave(&sport->port.lock, flags);
/*
* Finally, clear and enable interrupts
*/
writel(USR1_RTSD, sport->port.membase + USR1);
+ if (sport->dma_is_inited && !sport->dma_is_enabled)
+ imx_enable_dma(sport);
+
temp = readl(sport->port.membase + UCR1);
temp |= UCR1_RRDYEN | UCR1_RTSDEN | UCR1_UARTEN;
@@ -1326,11 +1334,6 @@
if (sport->have_rtscts) {
ucr2 &= ~UCR2_IRTS;
ucr2 |= UCR2_CTSC;
-
- /* Can we enable the DMA support? */
- if (is_imx6q_uart(sport) && !uart_console(port)
- && !sport->dma_is_inited)
- imx_uart_dma_init(sport);
} else {
termios->c_cflag &= ~CRTSCTS;
}
@@ -1452,8 +1455,6 @@
if (UART_ENABLE_MS(&sport->port, termios->c_cflag))
imx_enable_ms(&sport->port);
- if (sport->dma_is_inited && !sport->dma_is_enabled)
- imx_enable_dma(sport);
spin_unlock_irqrestore(&sport->port.lock, flags);
}