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| author | Hui Wang <jason77.wang@gmail.com> | 2011-08-24 17:41:47 +0800 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2011-08-24 15:27:59 -0700 |
| commit | 019dc9ea8d528eb3640bbba604e1e5a2f6994b1f (patch) | |
| tree | 7acf8e0361af95ea8ab490a6cd2fff4f6a4ac5b9 | |
| parent | 9a234349de01de3437784c0ef03d95353f055fae (diff) | |
| download | linux-019dc9ea8d528eb3640bbba604e1e5a2f6994b1f.tar.gz linux-019dc9ea8d528eb3640bbba604e1e5a2f6994b1f.tar.bz2 linux-019dc9ea8d528eb3640bbba604e1e5a2f6994b1f.zip | |
serial/imx: support to handle break character
The imx UART hardware controller can identify BREAK character and the
imx_set_termios() can accept BRKINT set by users, but current existing
imx_rxint() can't pass BREAK character and TTY_BREAK to the tty layer
as other serial drivers do (8250.c omap_serial.c).
Here add code to handle BREAK character and pass it to tty layer.
To detect error occurrence, i use URXD_ERR to replace (URXD_OVRRUN |
URXD_FRMERR | ...) because any kind of error occurs, URXD_ERR will
always be set to 1.
I put the URXD_BRK to the first place to check since when BREAK error
occurs, not only URXD_BRK is set to 1, but also URXD_PRERR and
URXD_FRMERR are all set to 1. This arrangement can filter out fake
parity and frame errors when BREAK error occurs.
Signed-off-by: Hui Wang <jason77.wang@gmail.com>
Acked-by: Sascha Hauer <s.hauer@pengutronix.de>
Acked-by: Alan Cox <alan@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
| -rw-r--r-- | drivers/tty/serial/imx.c | 10 |
1 files changed, 7 insertions, 3 deletions
diff --git a/drivers/tty/serial/imx.c b/drivers/tty/serial/imx.c index 7e91b3d368cd..54ffdc6243f9 100644 --- a/drivers/tty/serial/imx.c +++ b/drivers/tty/serial/imx.c @@ -508,8 +508,10 @@ static irqreturn_t imx_rxint(int irq, void *dev_id) if (uart_handle_sysrq_char(&sport->port, (unsigned char)rx)) continue; - if (rx & (URXD_PRERR | URXD_OVRRUN | URXD_FRMERR) ) { - if (rx & URXD_PRERR) + if (unlikely(rx & URXD_ERR)) { + if (rx & URXD_BRK) + sport->port.icount.brk++; + else if (rx & URXD_PRERR) sport->port.icount.parity++; else if (rx & URXD_FRMERR) sport->port.icount.frame++; @@ -524,7 +526,9 @@ static irqreturn_t imx_rxint(int irq, void *dev_id) rx &= sport->port.read_status_mask; - if (rx & URXD_PRERR) + if (rx & URXD_BRK) + flg = TTY_BREAK; + else if (rx & URXD_PRERR) flg = TTY_PARITY; else if (rx & URXD_FRMERR) flg = TTY_FRAME; |