Commit 93cf538e authored by Sherry Sun's avatar Sherry Sun Committed by Greg Kroah-Hartman
Browse files

tty: serial: fsl_lpuart: count tty buffer overruns 



Added support for counting the tty buffer overruns in fsl_lpuart driver
like other uart drivers.

Reviewed-by: default avatarJiri Slaby <jirislaby@kernel.org>
Signed-off-by: default avatarSherry Sun <sherry.sun@nxp.com>
Link: https://lore.kernel.org/r/20220111085130.5817-1-sherry.sun@nxp.com


Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 7a637784

drivers/tty/serial/fsl_lpuart.c

+13 −7
Original line number Diff line number Diff line
@@ -931,7 +931,8 @@ static void lpuart_rxint(struct lpuart_port *sport) 
			sport->port.sysrq = 0;

		}



		tty_insert_flip_char(port, rx, flg);

		if (tty_insert_flip_char(port, rx, flg) == 0)

			sport->port.icount.buf_overrun++;

	}



out:
@@ -1024,7 +1025,8 @@ static void lpuart32_rxint(struct lpuart_port *sport) 
				flg = TTY_OVERRUN;

		}



		tty_insert_flip_char(port, rx, flg);

		if (tty_insert_flip_char(port, rx, flg) == 0)

			sport->port.icount.buf_overrun++;

	}



out:
@@ -1116,7 +1118,7 @@ static void lpuart_copy_rx_to_tty(struct lpuart_port *sport) 
	struct dma_chan *chan = sport->dma_rx_chan;

	struct circ_buf *ring = &sport->rx_ring;

	unsigned long flags;

	int count = 0;

	int count = 0, copied;



	if (lpuart_is_32(sport)) {

		unsigned long sr = lpuart32_read(&sport->port, UARTSTAT);
@@ -1218,20 +1220,24 @@ static void lpuart_copy_rx_to_tty(struct lpuart_port *sport) 
	if (ring->head < ring->tail) {

		count = sport->rx_sgl.length - ring->tail;



		tty_insert_flip_string(port, ring->buf + ring->tail, count);

		copied = tty_insert_flip_string(port, ring->buf + ring->tail, count);

		if (copied != count)

			sport->port.icount.buf_overrun++;

		ring->tail = 0;

		sport->port.icount.rx += count;

		sport->port.icount.rx += copied;

	}



	/* Finally we read data from tail to head */

	if (ring->tail < ring->head) {

		count = ring->head - ring->tail;

		tty_insert_flip_string(port, ring->buf + ring->tail, count);

		copied = tty_insert_flip_string(port, ring->buf + ring->tail, count);

		if (copied != count)

			sport->port.icount.buf_overrun++;

		/* Wrap ring->head if needed */

		if (ring->head >= sport->rx_sgl.length)

			ring->head = 0;

		ring->tail = ring->head;

		sport->port.icount.rx += count;

		sport->port.icount.rx += copied;

	}



exit: