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Index: xr21v141x-lnx3.10-3.11/vizzini.c
===================================================================
--- xr21v141x-lnx3.10-3.11.orig/vizzini.c 2014-04-04 19:58:55.000000000 -0500
+++ xr21v141x-lnx3.10-3.11/vizzini.c 2014-04-16 15:05:16.470621233 -0500
@@ -61,6 +61,9 @@
#define DRIVER_AUTHOR "Ravi Reddy"
#define DRIVER_DESC "Exar USB UART Driver for XR21V141x "
+#define UART_PIN_RTS 0x020
+#define UART_GPIO_DIR 0x01b
+
static struct usb_driver xr21v141x_driver;
static struct tty_driver *xr21v141x_tty_driver;
static struct xr21v141x *xr21v141x_table[XR21V141X_TTY_MINORS];
@@ -1172,6 +1175,17 @@
vizzini_set_reg(xr21v141x, block, UART_FLOW, flow);
vizzini_set_reg(xr21v141x, block, UART_GPIO_MODE, gpio_mode);
+ /* if flow control hasn't been turned on, enable RTS for modem-like functionality */
+ if (flow == UART_FLOW_MODE_NONE) {
+ char value;
+ vizzini_get_reg(xr21v141x, block, UART_GPIO_DIR, &value);
+ value |= UART_PIN_RTS;
+ vizzini_set_reg(xr21v141x, block, UART_GPIO_DIR, value);
+ vizzini_get_reg(xr21v141x, block, UART_GPIO_CLR, &value);
+ value |= UART_PIN_RTS;
+ vizzini_set_reg(xr21v141x, block, UART_GPIO_CLR, value);
+ }
+
if (xr21v141x->trans9) {
/* Turn on wide mode if we're 9-bit transparent. */
vizzini_set_reg(xr21v141x, EPLOCALS_REG_BLOCK, (block * MEM_EP_LOCALS_SIZE) + EP_WIDE_MODE, 1);
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