[PATCH] serial: max310x: Properly set flags in AutoCTS mode
From: Christoph Vogtländer <hidden>
Date: 2019-09-04 12:55:01
Also in:
lkml
Subsystem:
the rest, tty layer and serial drivers · Maintainers:
Linus Torvalds, Greg Kroah-Hartman, Jiri Slaby
Possibly related (same subject, not in this thread)
- 2019-08-30 · [PATCH] serial: max310x: Properly set flags in AutoCTS mode · Christoph Vogtländer <hidden>
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 <redacted>
---
drivers/tty/serial/max310x.c | 12 ++++++++++--
1 file changed, 10 insertions(+), 2 deletions(-)
diff --git a/drivers/tty/serial/max310x.c b/drivers/tty/serial/max310x.c
index 0e24235..fb5a7e0 100644
--- a/drivers/tty/serial/max310x.c
+++ b/drivers/tty/serial/max310x.c@@ -859,15 +859,23 @@ 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 */
--
2.7.4