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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: Jiada Wang <jiada_wang@mentor.com>
Signed-off-by: Anton Bondarenko <anton_bondarenko@mentor.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Jiada Wang 2014-12-09 18:11:22 +09:00 committed by Greg Kroah-Hartman
parent 1842dc2e29
commit 55d8693acd
1 changed files with 9 additions and 1 deletions
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10
drivers/tty/serial/imx.c
View File

@ -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);
}
@ -910,7 +914,8 @@ static void dma_rx_callback(void *data)
dev_dbg(sport->port.dev, "We get %d bytes.\n", count);
if (count) {
tty_insert_flip_string(port, sport->rx_buf, count);
if (!(sport->port.ignore_status_mask & URXD_DUMMY_READ))
tty_insert_flip_string(port, sport->rx_buf, count);
tty_flip_buffer_push(port);
start_rx_dma(sport);
@ -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.
*/