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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: 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>
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parent
b9c2470fb1
commit
cb79f504bb
1 changed files with 16 additions and 3 deletions
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@ -373,13 +373,21 @@ static char tegra_uart_decode_rx_error(struct tegra_uart_port *tup,
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tup->uport.icount.frame++;
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dev_err(tup->uport.dev, "Got frame errors\n");
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} else if (lsr & UART_LSR_BI) {
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dev_err(tup->uport.dev, "Got Break\n");
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tup->uport.icount.brk++;
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/* If FIFO read error without any data, reset Rx FIFO */
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/*
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* Break error
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* If FIFO read error without any data, reset Rx FIFO
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*/
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if (!(lsr & UART_LSR_DR) && (lsr & UART_LSR_FIFOE))
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tegra_uart_fifo_reset(tup, UART_FCR_CLEAR_RCVR);
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if (tup->uport.ignore_status_mask & UART_LSR_BI)
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return TTY_BREAK;
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flag = TTY_BREAK;
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tup->uport.icount.brk++;
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dev_dbg(tup->uport.dev, "Got Break\n");
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}
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uart_insert_char(&tup->uport, lsr, UART_LSR_OE, 0, flag);
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}
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return flag;
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}
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@ -561,6 +569,9 @@ static void tegra_uart_handle_rx_pio(struct tegra_uart_port *tup,
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break;
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flag = tegra_uart_decode_rx_error(tup, lsr);
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if (flag != TTY_NORMAL)
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continue;
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ch = (unsigned char) tegra_uart_read(tup, UART_RX);
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tup->uport.icount.rx++;
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@ -1223,6 +1234,8 @@ static void tegra_uart_set_termios(struct uart_port *u,
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/* Ignore all characters if CREAD is not set */
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if ((termios->c_cflag & CREAD) == 0)
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tup->uport.ignore_status_mask |= UART_LSR_DR;
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if (termios->c_iflag & IGNBRK)
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tup->uport.ignore_status_mask |= UART_LSR_BI;
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spin_unlock_irqrestore(&u->lock, flags);
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}
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