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Commit 02b0abd3 authored by Uwe Kleine-König's avatar Uwe Kleine-König Committed by Greg Kroah-Hartman
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serial: imx: setup fifo waterlevel before enabling aging timer 



The aging timer fires if there are characters in the RX fifo but the
water level isn't reached yet. Make sure that the waterlevel is
configured before the aging timer is enabled to trigger a DMA request
(UCR1_ATDMAEN).

Signed-off-by: default avatarUwe Kleine-König <u.kleine-koenig@pengutronix.de>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 4444dcf1

drivers/tty/serial/imx.c

+2 −2
Original line number Diff line number Diff line
@@ -1239,13 +1239,13 @@ static void imx_enable_dma(struct imx_port *sport) 
{

	u32 ucr1;



	imx_setup_ufcr(sport, TXTL_DMA, RXTL_DMA);



	/* set UCR1 */

	ucr1 = imx_uart_readl(sport, UCR1);

	ucr1 |= UCR1_RXDMAEN | UCR1_TXDMAEN | UCR1_ATDMAEN;

	imx_uart_writel(sport, ucr1, UCR1);



	imx_setup_ufcr(sport, TXTL_DMA, RXTL_DMA);



	sport->dma_is_enabled = 1;

}