rk30:fiq mode serial debugger: enable RX fifo

diff --git a/arch/arm/plat-rk/rk_fiq_debugger.c b/arch/arm/plat-rk/rk_fiq_debugger.c
index f8c44971c77bb63f84ab39c9d47c1a3d5b0140c0..a3de3bd812c052ba423fddbe39999e99d2998368 100644 (file)
--- a/arch/arm/plat-rk/rk_fiq_debugger.c
+++ b/arch/arm/plat-rk/rk_fiq_debugger.c
@@ -72,8 +72,13 @@ static int debug_port_init(struct platform_device *pdev)
                (void)rk_fiq_read(t, UART_RX);
        /* enable rx and lsr interrupt */
        rk_fiq_write(t, UART_IER_RLSI | UART_IER_RDI, UART_IER);
-       /* interrupt on every character when receive,but we can enable fifo for TX*/
-       rk_fiq_write(t, 0x01, UART_FCR);
+       /* interrupt on every character when receive,but we can enable fifo for TX
+       I found that if we enable the RX fifo, some problem may vanish such as when
+       you continuously input characters in the command line the uart irq may be disable
+       because of the uart irq is served when CPU is at IRQ exception,but it is
+       found unregistered, so it is disable.
+       hhb@rock-chips.com */
+       rk_fiq_write(t, 0xc1, UART_FCR);
 
        return 0;
 }