From: hhb <hhb@rock-chips.com>
Date: Sat, 7 Apr 2012 09:56:38 +0000 (+0800)
Subject: rk30:fiq mode serial debugger: enable RX fifo
X-Git-Tag: firefly_0821_release~9452
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=310dd217ea4519031e408b47eadc3ef8040ebf43;p=firefly-linux-kernel-4.4.55.git

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 f8c44971c77b..a3de3bd812c0 100644
--- 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;
 }