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Commit cb79f504 authored by Krishna Yarlagadda's avatar Krishna Yarlagadda Committed by Greg Kroah-Hartman
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serial: tegra: report error to upper tty layer 



Report overrun/parity/frame/break errors to top tty layer. Add support
to ignore break character if IGNBRK is set.

Signed-off-by: default avatarShardar Shariff Md <smohammed@nvidia.com>
Signed-off-by: default avatarKrishna Yarlagadda <kyarlagadda@nvidia.com>
Link: https://lore.kernel.org/r/1567572187-29820-5-git-send-email-kyarlagadda@nvidia.com


Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent b9c2470f

drivers/tty/serial/serial-tegra.c

+16 −3
Original line number Diff line number Diff line
@@ -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);

}