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    Subject[PATCH 06/14] serial: tegra: report error to upper tty layer
    Date
    Report overrun/parity/frame/break errors to top tty layer. Add support
    to ignore break character if IGNBRK is set.

    Signed-off-by: Shardar Shariff Md <smohammed@nvidia.com>
    Signed-off-by: Krishna Yarlagadda <kyarlagadda@nvidia.com>
    ---
    drivers/tty/serial/serial-tegra.c | 19 ++++++++++++++++---
    1 file changed, 16 insertions(+), 3 deletions(-)

    diff --git a/drivers/tty/serial/serial-tegra.c b/drivers/tty/serial/serial-tegra.c
    index f6a3f4e..7ab81bb 100644
    --- a/drivers/tty/serial/serial-tegra.c
    +++ b/drivers/tty/serial/serial-tegra.c
    @@ -374,13 +374,21 @@ static char tegra_uart_decode_rx_error(struct tegra_uart_port *tup,
    tup->uport.icount.frame++;
    dev_err(tup->uport.dev, "Got frame errors\n");
    } else if (lsr & UART_LSR_BI) {
    - dev_err(tup->uport.dev, "Got Break\n");
    - tup->uport.icount.brk++;
    - /* If FIFO read error without any data, reset Rx FIFO */
    + /*
    + * Break error
    + * If FIFO read error without any data, reset Rx FIFO
    + */
    if (!(lsr & UART_LSR_DR) && (lsr & UART_LSR_FIFOE))
    tegra_uart_fifo_reset(tup, UART_FCR_CLEAR_RCVR);
    + if (tup->uport.ignore_status_mask & UART_LSR_BI)
    + return TTY_BREAK;
    + flag = TTY_BREAK;
    + tup->uport.icount.brk++;
    + dev_err(tup->uport.dev, "Got Break\n");
    }
    + uart_insert_char(&tup->uport, lsr, UART_LSR_OE, 0, flag);
    }
    +
    return flag;
    }

    @@ -562,6 +570,9 @@ static void tegra_uart_handle_rx_pio(struct tegra_uart_port *tup,
    break;

    flag = tegra_uart_decode_rx_error(tup, lsr);
    + if (flag != TTY_NORMAL)
    + continue;
    +
    ch = (unsigned char) tegra_uart_read(tup, UART_RX);
    tup->uport.icount.rx++;

    @@ -1224,6 +1235,8 @@ static void tegra_uart_set_termios(struct uart_port *u,
    /* Ignore all characters if CREAD is not set */
    if ((termios->c_cflag & CREAD) == 0)
    tup->uport.ignore_status_mask |= UART_LSR_DR;
    + if (termios->c_iflag & IGNBRK)
    + tup->uport.ignore_status_mask |= UART_LSR_BI;

    spin_unlock_irqrestore(&u->lock, flags);
    }
    --
    2.7.4
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