diff options
| author | Troy Kisky <troy.kisky@boundarydevices.com> | 2018-02-24 03:27:50 +0100 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2018-02-28 13:44:33 +0100 |
| commit | 45ca673e81df80f24a575e0a9a4e33c1f865ad08 (patch) | |
| tree | 7fb48bb86eeff453b54b8f3367e5b97f0a62c137 /drivers/tty | |
| parent | serial: 8250_dw: Allow TX FIFO to drain before writing to UART_LCR (diff) | |
| download | linux-45ca673e81df80f24a575e0a9a4e33c1f865ad08.tar.xz linux-45ca673e81df80f24a575e0a9a4e33c1f865ad08.zip | |
tty: serial: imx: allow breaks to be received when using dma
This allows me to login after sending a break when service
serial-getty@ttymxc0.service is running
The "tty_insert_flip_char(port, 0, TTY_BREAK)" in clear_rx_errors
fixes this by allowing the higher layers to see a break.
Also, call uart_handle_break to handle possible
"secure attention key."
FYI: Martin said the ROM sdma firmware works with this patch,
but external sdma firmware still does not send breaks on a
i.mx6UL
Signed-off-by: Troy Kisky <troy.kisky@boundarydevices.com>
Tested-by: Martin Hicks <mort@bork.org>
Reviewed-by: Fabio Estevam <fabio.estevam@nxp.com>
Acked-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/tty')
| -rw-r--r-- | drivers/tty/serial/imx.c | 21 |
1 files changed, 14 insertions, 7 deletions
diff --git a/drivers/tty/serial/imx.c b/drivers/tty/serial/imx.c index 1d7ca382bc12..ace96283bdb8 100644 --- a/drivers/tty/serial/imx.c +++ b/drivers/tty/serial/imx.c @@ -927,7 +927,6 @@ static void dma_rx_callback(void *data) status = dmaengine_tx_status(chan, (dma_cookie_t)0, &state); if (status == DMA_ERROR) { - dev_err(sport->port.dev, "DMA transaction error.\n"); clear_rx_errors(sport); return; } @@ -1028,6 +1027,7 @@ static int start_rx_dma(struct imx_port *sport) static void clear_rx_errors(struct imx_port *sport) { + struct tty_port *port = &sport->port.state->port; unsigned int status_usr1, status_usr2; status_usr1 = readl(sport->port.membase + USR1); @@ -1036,12 +1036,19 @@ static void clear_rx_errors(struct imx_port *sport) if (status_usr2 & USR2_BRCD) { sport->port.icount.brk++; writel(USR2_BRCD, sport->port.membase + USR2); - } else if (status_usr1 & USR1_FRAMERR) { - sport->port.icount.frame++; - writel(USR1_FRAMERR, sport->port.membase + USR1); - } else if (status_usr1 & USR1_PARITYERR) { - sport->port.icount.parity++; - writel(USR1_PARITYERR, sport->port.membase + USR1); + uart_handle_break(&sport->port); + if (tty_insert_flip_char(port, 0, TTY_BREAK) == 0) + sport->port.icount.buf_overrun++; + tty_flip_buffer_push(port); + } else { + dev_err(sport->port.dev, "DMA transaction error.\n"); + if (status_usr1 & USR1_FRAMERR) { + sport->port.icount.frame++; + writel(USR1_FRAMERR, sport->port.membase + USR1); + } else if (status_usr1 & USR1_PARITYERR) { + sport->port.icount.parity++; + writel(USR1_PARITYERR, sport->port.membase + USR1); + } } if (status_usr2 & USR2_ORE) { |