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tty: serial: fsl_lpuart: count tty buffer overruns

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

Reviewed-by: Jiri Slaby <jirislaby@kernel.org>
Signed-off-by: Sherry Sun <sherry.sun@nxp.com>
Link: https://lore.kernel.org/r/20220111085130.5817-1-sherry.sun@nxp.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Sherry Sun 2022-01-11 16:51:30 +08:00 • committed by Greg Kroah-Hartman
parent 7a637784d5
commit 93cf538e23
1 changed files with 13 additions and 7 deletions
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20
drivers/tty/serial/fsl_lpuart.c
View file

@ -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: