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Diffstat (limited to 'arch/arm/mach-omap2/serial.c')
-rw-r--r--arch/arm/mach-omap2/serial.c23
1 files changed, 19 insertions, 4 deletions
diff --git a/arch/arm/mach-omap2/serial.c b/arch/arm/mach-omap2/serial.c
index 19805a7de06..e10a02df6e1 100644
--- a/arch/arm/mach-omap2/serial.c
+++ b/arch/arm/mach-omap2/serial.c
@@ -36,7 +36,13 @@
#define UART_OMAP_NO_EMPTY_FIFO_READ_IP_REV 0x52
#define UART_OMAP_WER 0x17 /* Wake-up enable register */
-#define DEFAULT_TIMEOUT (5 * HZ)
+/*
+ * NOTE: By default the serial timeout is disabled as it causes lost characters
+ * over the serial ports. This means that the UART clocks will stay on until
+ * disabled via sysfs. This also causes that any deeper omap sleep states are
+ * blocked.
+ */
+#define DEFAULT_TIMEOUT 0
struct omap_uart_state {
int num;
@@ -125,6 +131,13 @@ static struct plat_serial8250_port serial_platform_data3[] = {
}
};
#endif
+static inline unsigned int __serial_read_reg(struct uart_port *up,
+ int offset)
+{
+ offset <<= up->regshift;
+ return (unsigned int)__raw_readb(up->membase + offset);
+}
+
static inline unsigned int serial_read_reg(struct plat_serial8250_port *up,
int offset)
{
@@ -415,7 +428,8 @@ static void omap_uart_idle_init(struct omap_uart_state *uart)
uart->timeout = DEFAULT_TIMEOUT;
setup_timer(&uart->timer, omap_uart_idle_timer,
(unsigned long) uart);
- mod_timer(&uart->timer, jiffies + uart->timeout);
+ if (uart->timeout)
+ mod_timer(&uart->timer, jiffies + uart->timeout);
omap_uart_smart_idle_enable(uart, 0);
if (cpu_is_omap34xx()) {
@@ -583,11 +597,12 @@ static unsigned int serial_in_override(struct uart_port *up, int offset)
{
if (UART_RX == offset) {
unsigned int lsr;
- lsr = serial_read_reg(omap_uart[up->line].p, UART_LSR);
+ lsr = __serial_read_reg(up, UART_LSR);
if (!(lsr & UART_LSR_DR))
return -EPERM;
}
- return serial_read_reg(omap_uart[up->line].p, offset);
+
+ return __serial_read_reg(up, offset);
}
void __init omap_serial_early_init(void)