diff options
| author | Christoph Vogtländer <c.vogtlaender@sigma-surface-science.com> | 2019-09-04 15:11:41 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2019-09-05 10:57:44 +0300 |
| commit | 5a8c296f5362fffc9da5da10eef01cf0b9b4ac7f (patch) | |
| tree | d59c077b82e21459c000566aba89be3c013d9b1d | |
| parent | 8966110c56459d3d0cf3bded77a92988063b0842 (diff) | |
| download | linux-5a8c296f5362fffc9da5da10eef01cf0b9b4ac7f.tar.xz | |
serial: max310x: Properly set flags in AutoCTS mode
Commit 391f93f2ec9f ("serial: core: Rework hw-assisted flow control
support") has changed the way the AutoCTS mode is handled.
According to that change, serial drivers which enable H/W AutoCTS mode must
set UPSTAT_AUTORTS, UPSTAT_AUTOCTS and UPSTAT_AUTOXOFF to prevent the
serial core from inadvertently disabling RX or TX. This patch adds proper
handling of UPSTAT_AUTORTS, UPSTAT_AUTOCTS and UPSTAT_AUTOXOFF flags.
Signed-off-by: Christoph Vogtländer <c.vogtlaender@sigma-surface-science.com>
Link: https://lore.kernel.org/r/20190904121141.4570-1-c.vogtlaender@sigma-surface-science.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| -rw-r--r-- | drivers/tty/serial/max310x.c | 12 |
1 files changed, 10 insertions, 2 deletions
diff --git a/drivers/tty/serial/max310x.c b/drivers/tty/serial/max310x.c index 0e0c2740ec7e..aed19c688beb 100644 --- a/drivers/tty/serial/max310x.c +++ b/drivers/tty/serial/max310x.c @@ -955,15 +955,23 @@ static void max310x_set_termios(struct uart_port *port, /* Configure flow control */ max310x_port_write(port, MAX310X_XON1_REG, termios->c_cc[VSTART]); max310x_port_write(port, MAX310X_XOFF1_REG, termios->c_cc[VSTOP]); - if (termios->c_cflag & CRTSCTS) + + port->status &= ~(UPSTAT_AUTOCTS | UPSTAT_AUTORTS | UPSTAT_AUTOXOFF); + + if (termios->c_cflag & CRTSCTS) { + /* Enable AUTORTS and AUTOCTS */ + port->status |= UPSTAT_AUTOCTS | UPSTAT_AUTORTS; flow |= MAX310X_FLOWCTRL_AUTOCTS_BIT | MAX310X_FLOWCTRL_AUTORTS_BIT; + } if (termios->c_iflag & IXON) flow |= MAX310X_FLOWCTRL_SWFLOW3_BIT | MAX310X_FLOWCTRL_SWFLOWEN_BIT; - if (termios->c_iflag & IXOFF) + if (termios->c_iflag & IXOFF) { + port->status |= UPSTAT_AUTOXOFF; flow |= MAX310X_FLOWCTRL_SWFLOW1_BIT | MAX310X_FLOWCTRL_SWFLOWEN_BIT; + } max310x_port_write(port, MAX310X_FLOWCTRL_REG, flow); /* Get baud rate generator configuration */ |