[PATCH] powerpc: udbg updates

The udbg low level io layer has an issue with udbg_getc() returning a
char (unsigned on ppc) instead of an int, thus the -1 if you had no
available input device could end up turned into 0xff, filling your
display with bogus characters. This fixes it, along with adding a little
blob to xmon to do a delay before exiting when getting an EOF and fixing
the detection of ADB keyboards in udbg_adb.c

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Paul Mackerras <paulus@samba.org>

arch/powerpc/kernel/prom_parse.c

@@ -276,7 +276,7 @@ static int of_translate_one(struct device_node *parent, struct of_bus *bus,
 
  finish:
 	of_dump_addr("OF: parent translation for:", addr, pna);
-	DBG("OF: with offset: %lx\n", offset);
+	DBG("OF: with offset: "PRu64"\n", offset);
 
 	/* Translate it into parent bus space */
 	return pbus->translate(addr, offset, pna);

arch/powerpc/kernel/udbg.c

@@ -17,7 +17,7 @@
 #include <asm/processor.h>
 
 void (*udbg_putc)(char c);
-char (*udbg_getc)(void);
+int (*udbg_getc)(void);
 int (*udbg_getc_poll)(void);
 
 /* udbg library, used by xmon et al */
@@ -57,8 +57,8 @@ int udbg_write(const char *s, int n)
 
 int udbg_read(char *buf, int buflen)
 {
-	char c, *p = buf;
-	int i;
+	char *p = buf;
+	int i, c;
 
 	if (!udbg_getc)
 		return 0;
@@ -66,8 +66,11 @@ int udbg_read(char *buf, int buflen)
 	for (i = 0; i < buflen; ++i) {
 		do {
 			c = udbg_getc();
+			if (c == -1 && i == 0)
+				return -1;
+
 		} while (c == 0x11 || c == 0x13);
-		if (c == 0)
+		if (c == 0 || c == -1)
 			break;
 		*p++ = c;
 	}

arch/powerpc/kernel/udbg_16550.c

@@ -69,14 +69,14 @@ static int udbg_550_getc_poll(void)
 	return -1;
 }
 
-static char udbg_550_getc(void)
+static int udbg_550_getc(void)
 {
 	if (udbg_comport) {
 		while ((in_8(&udbg_comport->lsr) & LSR_DR) == 0)
 			/* wait for char */;
 		return in_8(&udbg_comport->rbr);
 	}
-	return 0;
+	return -1;
 }
 
 void udbg_init_uart(void __iomem *comport, unsigned int speed,