serial: mxs-auart: set the FIFO size to DMA buffer size

When DMA is enabled (with hardware flow control enabled) the FIFO size
must be set to the size of the DMA buffer, as this is the size the tty
subsystem can use.

Signed-off-by: Hector Palacios <hector.palacios@digi.com>
Reviewed-by: Marek Vasut <marex@denx.de>
Acked-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

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;