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path: root/drivers/tty/serial/mxs-auart.c
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Diffstat (limited to 'drivers/tty/serial/mxs-auart.c')
-rw-r--r--drivers/tty/serial/mxs-auart.c9
1 files changed, 8 insertions, 1 deletions
diff --git a/drivers/tty/serial/mxs-auart.c b/drivers/tty/serial/mxs-auart.c
index 10e9d70b5c40..d8b6fee77a03 100644
--- a/drivers/tty/serial/mxs-auart.c
+++ b/drivers/tty/serial/mxs-auart.c
@@ -39,6 +39,7 @@
#include <asm/cacheflush.h>
#define MXS_AUART_PORTS 5
+#define MXS_AUART_FIFO_SIZE 16
#define AUART_CTRL0 0x00000000
#define AUART_CTRL0_SET 0x00000004
@@ -548,6 +549,9 @@ static int mxs_auart_dma_init(struct mxs_auart_port *s)
s->flags |= MXS_AUART_DMA_ENABLED;
dev_dbg(s->dev, "enabled the DMA support.");
+ /* The DMA buffer is now the FIFO the TTY subsystem can use */
+ s->port.fifosize = UART_XMIT_SIZE;
+
return 0;
err_out:
@@ -741,6 +745,9 @@ static int mxs_auart_startup(struct uart_port *u)
writel(AUART_INTR_RXIEN | AUART_INTR_RTIEN | AUART_INTR_CTSMIEN,
u->membase + AUART_INTR);
+ /* Reset FIFO size (it could have changed if DMA was enabled) */
+ u->fifosize = MXS_AUART_FIFO_SIZE;
+
/*
* Enable fifo so all four bytes of a DMA word are written to
* output (otherwise, only the LSB is written, ie. 1 in 4 bytes)
@@ -1056,7 +1063,7 @@ static int mxs_auart_probe(struct platform_device *pdev)
s->port.membase = ioremap(r->start, resource_size(r));
s->port.ops = &mxs_auart_ops;
s->port.iotype = UPIO_MEM;
- s->port.fifosize = 16;
+ s->port.fifosize = MXS_AUART_FIFO_SIZE;
s->port.uartclk = clk_get_rate(s->clk);
s->port.type = PORT_IMX;
s->port.dev = s->dev = &pdev->dev;