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authorWan Ahmad Zainie <wan.ahmad.zainie.wan.mohamad@intel.com>2016-04-06 12:06:52 +0800
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2016-04-30 09:26:55 -0700
commitc2684ed7d0e908e7c8dad7f199922d342ea55c66 (patch)
tree995dc2978b1f4dc11e283ba9884a3d22e6589f1a
parent144ef5c2df9b473dad7eab375adcf5b11d0b1e47 (diff)
downloadop-kernel-dev-c2684ed7d0e908e7c8dad7f199922d342ea55c66.zip
op-kernel-dev-c2684ed7d0e908e7c8dad7f199922d342ea55c66.tar.gz
serial: 8250_pci: report DCD and DSR signals as active for Bay Trail
Bay Trail UART port does not support DCD and DSR lines. The driver shall report that these signals are permanently active. This patch is for HSUART enumerated via PCI. For ACPI, see commit dfd37668ea6d ("serial: 8250_dw: Fix get_mctrl behaviour"). The commit also describes the possible issue if these signals are enabled on a port without these pins. Signed-off-by: Wan Ahmad Zainie <wan.ahmad.zainie.wan.mohamad@intel.com> Acked-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Reviewed-by: Heikki Krogerus <heikki.krogerus@linux.intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
-rw-r--r--drivers/tty/serial/8250/8250_pci.c12
1 files changed, 12 insertions, 0 deletions
diff --git a/drivers/tty/serial/8250/8250_pci.c b/drivers/tty/serial/8250/8250_pci.c
index 4eedd1d..0cf5123 100644
--- a/drivers/tty/serial/8250/8250_pci.c
+++ b/drivers/tty/serial/8250/8250_pci.c
@@ -1416,6 +1416,17 @@ static bool byt_dma_filter(struct dma_chan *chan, void *param)
return true;
}
+static unsigned int
+byt_get_mctrl(struct uart_port *port)
+{
+ unsigned int ret = serial8250_do_get_mctrl(port);
+
+ /* Force DCD and DSR signals to permanently be reported as active. */
+ ret |= TIOCM_CAR | TIOCM_DSR;
+
+ return ret;
+}
+
static int
byt_serial_setup(struct serial_private *priv,
const struct pciserial_board *board,
@@ -1480,6 +1491,7 @@ byt_serial_setup(struct serial_private *priv,
port->port.type = PORT_16550A;
port->port.flags = (port->port.flags | UPF_FIXED_PORT | UPF_FIXED_TYPE);
port->port.set_termios = byt_set_termios;
+ port->port.get_mctrl = byt_get_mctrl;
port->port.fifosize = 64;
port->tx_loadsz = 64;
port->dma = dma;
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