spl: serial_bcm283x: remove unnecessary gpio setting

The config.txt has enable_uart=1 option, so bootcode.bin will set
register to enable uart, so spl of rpi3 does not need to set uart
register. Remove the unnecessary setting to remove garbage in uart
rx.

This fixes unexpected hang-up on u-boot prompt without connection
uart to serial console.

Change-Id: I813b4304e434c0f3d51d06078b38d09adb7b993d
Signed-off-by: Seung-Woo Kim <sw0312.kim@samsung.com>

diff --git a/drivers/serial/serial_bcm283x_mu.c b/drivers/serial/serial_bcm283x_mu.c
index 20d9eb95fc6b7a3f9a1bec7734577c781814ff8e..1be41ff11a69a7a687c94e56ffcda79a2d72f9b8 100644 (file)
--- a/drivers/serial/serial_bcm283x_mu.c
+++ b/drivers/serial/serial_bcm283x_mu.c
@@ -227,26 +227,10 @@ U_BOOT_DRIVER(serial_bcm283x_mu) = {
 
 static inline void _debug_uart_init(void)
 {
-       int     i;
-
-       AUX_ENB |= 1;   /* Enable mini-uart */
-       MU_LCR = 3;     /* 8 bit. */
-       MU_BAUD = 270;  /* 115200 baud.(0x10e) */
-
-       GPFSEL1 &= ~((7<<12) | (7 << 15));      /* GPIO14 & 15 : alt5 */
-       GPFSEL1 |= (2 << 12) | (2 << 15);
-
-       /* Disable pull-up/down */
-       GPPUD = 0;
-       for (i = 0; i < 150; i++)
-               __asm__ __volatile__("nop");
-       GPPUDCLK0 = (2 << 14) | (2 << 15);
-       for (i = 0; i < 150; i++)
-               __asm__ __volatile__("nop");
-
-       GPPUDCLK0 = 0;
-
-       MU_CNTL = 3;    /* Enable Tx & Rx */
+       /*
+        * uart setting is already done from bootcode.bin
+        * with enable_uart=1 in config.txt
+        */
 }
 
 static inline void _debug_uart_putc(int ch)