Commit 0bbc9b81 authored Dec 09, 2014 by Jiada Wang Committed by Greg Kroah-Hartman Jan 09, 2015

serial: imx: call imx_dma_tx() again in dma_tx_callback



Currently in dma_tx_callback(), no matter if there is still
remaining data pending in circle buffer or not, DMA transmit
will be terminated.

This will result in some data never get transmitted.
In order to fix this issue, call imx_dma_tx() again in
dma_tx_callback, when there is pending data and uart hasn't
been stopped.

Signed-off-by: Jiada Wang <jiada_wang@mentor.com>
Signed-off-by: Dirk Behme <dirk.behme@de.bosch.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

parent d64b8607

drivers/tty/serial/imx.c

+6 −0

Original line number	Diff line number	Diff line
		@@ -495,6 +495,7 @@ static inline void imx_transmit_buffer(struct imx_port *sport)
		imx_stop_tx(&sport->port);
		}

		static void imx_dma_tx(struct imx_port *sport);
		static void dma_tx_callback(void *data)
		{
		struct imx_port *sport = data;
		@@ -524,6 +525,11 @@ static void dma_tx_callback(void *data)
		dev_dbg(sport->port.dev, "exit in %s.\n", __func__);
		return;
		}

		spin_lock_irqsave(&sport->port.lock, flags);
		if (!uart_circ_empty(xmit) && !uart_tx_stopped(&sport->port))
		imx_dma_tx(sport);
		spin_unlock_irqrestore(&sport->port.lock, flags);
		}

		static void imx_dma_tx(struct imx_port *sport)

Admin message