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authorChristoph Vogtländer <c.vogtlaender@sigma-surface-science.com>2019-09-04 15:11:41 +0300
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2019-09-05 10:57:44 +0300
commit5a8c296f5362fffc9da5da10eef01cf0b9b4ac7f (patch)
treed59c077b82e21459c000566aba89be3c013d9b1d
parent8966110c56459d3d0cf3bded77a92988063b0842 (diff)
downloadlinux-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.c12
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 */