diff options
| author | Jason Uy <jason.uy@broadcom.com> | 2017-01-11 22:48:20 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2017-01-19 16:20:23 +0300 |
| commit | 6a171b29937984a5e0bf29d6577b055998f03edb (patch) | |
| tree | 2f12b20fce4fe7fdfc405426657526abb2faa5bc /drivers/tty | |
| parent | dfc80387aefb78161f83732804c6d01c89c24595 (diff) | |
| download | linux-6a171b29937984a5e0bf29d6577b055998f03edb.tar.xz | |
serial: 8250_dw: Allow hardware flow control to be used
In the most common use case, the Synopsys DW UART driver does not
set the set_termios callback function. This prevents UPSTAT_AUTOCTS
from being set when the UART flag CRTSCTS is set. As a result, the
driver will use software flow control as opposed to hardware flow
control.
To fix the problem, the set_termios callback function is set to the
DW specific function. The logic to set UPSTAT_AUTOCTS is moved so
that any clock error will not affect setting the hardware flow
control.
Reviewed-by: Scott Branden <scott.branden@broadcom.com>
Reviewed-by: Ray Jui <ray.jui@broadcom.com>
Signed-off-by: Jason Uy <jason.uy@broadcom.com>
Reviewed-by: Kefeng Wang <wangkefeng.wang@huawei.com>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/tty')
| -rw-r--r-- | drivers/tty/serial/8250/8250_dw.c | 5 |
1 files changed, 2 insertions, 3 deletions
diff --git a/drivers/tty/serial/8250/8250_dw.c b/drivers/tty/serial/8250/8250_dw.c index c89fafc972b6..c89ae4581378 100644 --- a/drivers/tty/serial/8250/8250_dw.c +++ b/drivers/tty/serial/8250/8250_dw.c @@ -248,11 +248,11 @@ static void dw8250_set_termios(struct uart_port *p, struct ktermios *termios, if (!ret) p->uartclk = rate; +out: p->status &= ~UPSTAT_AUTOCTS; if (termios->c_cflag & CRTSCTS) p->status |= UPSTAT_AUTOCTS; -out: serial8250_do_set_termios(p, termios, old); } @@ -326,13 +326,11 @@ static void dw8250_quirks(struct uart_port *p, struct dw8250_data *data) p->serial_in = dw8250_serial_in32; data->uart_16550_compatible = true; } - p->set_termios = dw8250_set_termios; } /* Platforms with iDMA */ if (platform_get_resource_byname(to_platform_device(p->dev), IORESOURCE_MEM, "lpss_priv")) { - p->set_termios = dw8250_set_termios; data->dma.rx_param = p->dev->parent; data->dma.tx_param = p->dev->parent; data->dma.fn = dw8250_idma_filter; @@ -414,6 +412,7 @@ static int dw8250_probe(struct platform_device *pdev) p->serial_in = dw8250_serial_in; p->serial_out = dw8250_serial_out; p->set_ldisc = dw8250_set_ldisc; + p->set_termios = dw8250_set_termios; p->membase = devm_ioremap(dev, regs->start, resource_size(regs)); if (!p->membase) |