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Commit 33ae787b authored by Shardar Shariff Md's avatar Shardar Shariff Md Committed by Greg Kroah-Hartman
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serial: tegra: add support to ignore read 



Add support to ignore read characters if CREAD flag is not 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/1567572187-29820-2-git-send-email-kyarlagadda@nvidia.com


Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 9c801e31

drivers/tty/serial/serial-tegra.c

+12 −0
Original line number Diff line number Diff line
@@ -547,6 +547,9 @@ static void tegra_uart_handle_rx_pio(struct tegra_uart_port *tup, 


		if (!uart_handle_sysrq_char(&tup->uport, ch) && tty)

			tty_insert_flip_char(tty, ch, flag);



		if (tup->uport.ignore_status_mask & UART_LSR_DR)

			continue;

	} while (1);

}
@@ -565,6 +568,10 @@ static void tegra_uart_copy_rx_to_tty(struct tegra_uart_port *tup, 
		dev_err(tup->uport.dev, "No tty port\n");

		return;

	}



	if (tup->uport.ignore_status_mask & UART_LSR_DR)

		return;



	dma_sync_single_for_cpu(tup->uport.dev, tup->rx_dma_buf_phys,

				TEGRA_UART_RX_DMA_BUFFER_SIZE, DMA_FROM_DEVICE);

	copied = tty_insert_flip_string(tty,
@@ -1193,6 +1200,11 @@ static void tegra_uart_set_termios(struct uart_port *u, 
	tegra_uart_write(tup, tup->ier_shadow, UART_IER);

	tegra_uart_read(tup, UART_IER);



	tup->uport.ignore_status_mask = 0;

	/* Ignore all characters if CREAD is not set */

	if ((termios->c_cflag & CREAD) == 0)

		tup->uport.ignore_status_mask |= UART_LSR_DR;



	spin_unlock_irqrestore(&u->lock, flags);

}