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serial: tegra: report error to upper tty layer

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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>
Link: https://lore.kernel.org/r/1567572187-29820-5-git-send-email-kyarlagadda@nvidia.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Krishna Yarlagadda 2019-09-04 10:12:59 +05:30 committed by Greg Kroah-Hartman
parent b9c2470fb1
commit cb79f504bb
1 changed files with 16 additions and 3 deletions
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19
drivers/tty/serial/serial-tegra.c
View file

@ -373,13 +373,21 @@ 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_dbg(tup->uport.dev, "Got Break\n");
}
uart_insert_char(&tup->uport, lsr, UART_LSR_OE, 0, flag);
}
return flag;
}
@ -561,6 +569,9 @@ 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++;
@ -1223,6 +1234,8 @@ 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);
}