Commit 4238c00b authored by Uwe Kleine-König's avatar Uwe Kleine-König Committed by Greg Kroah-Hartman
Browse files

serial: imx: simplify tracking of dma being initialized 



The .dma_is_inited member is only set to a value != 0 when the port's
startup function calls imx_uart_dma_init(). On shutdown of the port
imx_uart_dma_exit is called which sets the value back to 0. So
.dma_is_inited is always 0 when imx_startup() is called (assuming
.startup() and .shutdown() are correctly balanced) and the check for
!sport->dma_is_inited can go away.

This allows to replace .dma_is_inited by a variable local to
imx_startup.

Signed-off-by: default avatarUwe Kleine-König <u.kleine-koenig@pengutronix.de>
Reviewed-by: default avatarShawn Guo <shawnguo@kernel.org>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 43776896

drivers/tty/serial/imx.c

+4 −8
Original line number Diff line number Diff line
@@ -205,7 +205,6 @@ struct imx_port { 
	struct mctrl_gpios *gpios;



	/* DMA fields */

	unsigned int		dma_is_inited:1;

	unsigned int		dma_is_enabled:1;

	unsigned int		dma_is_rxing:1;

	unsigned int		dma_is_txing:1;
@@ -1114,8 +1113,6 @@ static void imx_uart_dma_exit(struct imx_port *sport) 
		dma_release_channel(sport->dma_chan_tx);

		sport->dma_chan_tx = NULL;

	}



	sport->dma_is_inited = 0;

}



static int imx_uart_dma_init(struct imx_port *sport)
@@ -1168,8 +1165,6 @@ static int imx_uart_dma_init(struct imx_port *sport) 
		goto err;

	}



	sport->dma_is_inited = 1;



	return 0;

err:

	imx_uart_dma_exit(sport);
@@ -1217,6 +1212,7 @@ static int imx_startup(struct uart_port *port) 
	struct imx_port *sport = (struct imx_port *)port;

	int retval, i;

	unsigned long flags, temp;

	int dma_is_inited = 0;



	retval = clk_prepare_enable(sport->clk_per);

	if (retval)
@@ -1241,8 +1237,8 @@ static int imx_startup(struct uart_port *port) 
	writel(temp & ~UCR4_DREN, sport->port.membase + UCR4);



	/* Can we enable the DMA support? */

	if (!uart_console(port) && !sport->dma_is_inited)

		imx_uart_dma_init(sport);

	if (!uart_console(port) && imx_uart_dma_init(sport) == 0)

		dma_is_inited = 1;



	spin_lock_irqsave(&sport->port.lock, flags);

	/* Reset fifo's and state machines */
@@ -1261,7 +1257,7 @@ static int imx_startup(struct uart_port *port) 
	writel(USR1_RTSD | USR1_DTRD, sport->port.membase + USR1);

	writel(USR2_ORE, sport->port.membase + USR2);



	if (sport->dma_is_inited && !sport->dma_is_enabled)

	if (dma_is_inited && !sport->dma_is_enabled)

		imx_enable_dma(sport);



	temp = readl(sport->port.membase + UCR1) & ~UCR1_RRDYEN;

CRA Git | Maintained and supported by SUSTech CRA and CCSE