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Commit 55d8693a authored by Jiada Wang's avatar Jiada Wang Committed by Greg Kroah-Hartman
Browse files

serial: imx: add CREAD flag support 



Add CREAD flag hanlding in set_termios and UART DMA mode
which ignores all received chars when CREAD flag cleared.

Signed-off-by: default avatarJiada Wang <jiada_wang@mentor.com>
Signed-off-by: default avatarAnton Bondarenko <anton_bondarenko@mentor.com>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 1842dc2e

drivers/tty/serial/imx.c

+9 −1
Original line number Diff line number Diff line
@@ -74,6 +74,7 @@ 
#define IMX21_UTS 0xb4 /* UART Test Register on all other i.mx*/



/* UART Control Register Bit Fields.*/

#define URXD_DUMMY_READ (1<<16)

#define URXD_CHARRDY	(1<<15)

#define URXD_ERR	(1<<14)

#define URXD_OVRRUN	(1<<13)
@@ -710,6 +711,9 @@ static irqreturn_t imx_rxint(int irq, void *dev_id) 
#endif

		}



		if (sport->port.ignore_status_mask & URXD_DUMMY_READ)

			goto out;



		tty_insert_flip_char(port, rx, flg);

	}
@@ -910,6 +914,7 @@ static void dma_rx_callback(void *data) 
	dev_dbg(sport->port.dev, "We get %d bytes.\n", count);



	if (count) {

		if (!(sport->port.ignore_status_mask & URXD_DUMMY_READ))

			tty_insert_flip_string(port, sport->rx_buf, count);

		tty_flip_buffer_push(port);
@@ -1330,6 +1335,9 @@ imx_set_termios(struct uart_port *port, struct ktermios *termios, 
			sport->port.ignore_status_mask |= URXD_OVRRUN;

	}



	if ((termios->c_cflag & CREAD) == 0)

		sport->port.ignore_status_mask |= URXD_DUMMY_READ;



	/*

	 * Update the per-port timeout.

	 */