[U-Boot] [PATCH 1/2] console: Use pre-console buffer to get complete log on all consoles

[Siarhei Siamashka <siarhei.siamashka@gmail.com>]

Currently the pre-console buffer can accumulate early log messages
and flush them to the serial console as soon as it becomes available.

This patch just adds one more pre-console buffer flushing point and
does all the same for the other consoles too. This is particularly
useful for the vga/hdmi/lcd console, where we can see all the older
messages now (except for the log messages from SPL).

Naturally, we don't want to get an extra copy of the log messages
on the serial console again at the second flushing point, so the
serial console has to be explicitly filtered out.

Signed-off-by: Siarhei Siamashka <siarhei.siamashka@gmail.com>
---
 common/console.c | 46 +++++++++++++++++++++++++++++++++++++++++-----
 1 file changed, 41 insertions(+), 5 deletions(-)

diff --git a/common/console.c b/common/console.c
index 29560c3..fc1963b 100644
--- a/common/console.c
+++ b/common/console.c
@@ -199,6 +199,20 @@ static void console_putc(int file, const char c)
 	}
 }
 
+#ifdef CONFIG_PRE_CONSOLE_BUFFER
+static void console_putc_noserial(int file, const char c)
+{
+	int i;
+	struct stdio_dev *dev;
+
+	for (i = 0; i < cd_count[file]; i++) {
+		dev = console_devices[file][i];
+		if (dev->putc != NULL && strcmp(dev->name, "serial") != 0)
+			dev->putc(dev, c);
+	}
+}
+#endif
+
 static void console_puts(int file, const char *s)
 {
 	int i;
@@ -236,6 +250,14 @@ static inline void console_putc(int file, const char c)
 	stdio_devices[file]->putc(stdio_devices[file], c);
 }
 
+#ifdef CONFIG_PRE_CONSOLE_BUFFER
+static inline void console_putc_noserial(int file, const char c)
+{
+	if (strcmp(stdio_devices[file]->name, "serial") != 0)
+		stdio_devices[file]->putc(stdio_devices[file], c);
+}
+#endif
+
 static inline void console_puts(int file, const char *s)
 {
 	stdio_devices[file]->puts(stdio_devices[file], s);
@@ -382,6 +404,9 @@ int tstc(void)
 	return serial_tstc();
 }
 
+#define PRE_CONSOLE_FLUSHPOINT1_SERIAL			0
+#define PRE_CONSOLE_FLUSHPOINT2_EVERYTHING_BUT_SERIAL	1
+
 #ifdef CONFIG_PRE_CONSOLE_BUFFER
 #define CIRC_BUF_IDX(idx) ((idx) % (unsigned long)CONFIG_PRE_CON_BUF_SZ)
 
@@ -398,7 +423,7 @@ static void pre_console_puts(const char *s)
 		pre_console_putc(*s++);
 }
 
-static void print_pre_console_buffer(void)
+static void print_pre_console_buffer(int flushpoint)
 {
 	unsigned long i = 0;
 	char *buffer = (char *)CONFIG_PRE_CON_BUF_ADDR;
@@ -407,12 +432,20 @@ static void print_pre_console_buffer(void)
 		i = gd->precon_buf_idx - CONFIG_PRE_CON_BUF_SZ;
 
 	while (i < gd->precon_buf_idx)
-		putc(buffer[CIRC_BUF_IDX(i++)]);
+		switch (flushpoint) {
+		case PRE_CONSOLE_FLUSHPOINT1_SERIAL:
+			putc(buffer[CIRC_BUF_IDX(i++)]);
+			break;
+		case PRE_CONSOLE_FLUSHPOINT2_EVERYTHING_BUT_SERIAL:
+			console_putc_noserial(stdout,
+					      buffer[CIRC_BUF_IDX(i++)]);
+			break;
+		}
 }
 #else
 static inline void pre_console_putc(const char c) {}
 static inline void pre_console_puts(const char *s) {}
-static inline void print_pre_console_buffer(void) {}
+static inline void print_pre_console_buffer(int flushpoint) {}
 #endif
 
 void putc(const char c)
@@ -441,6 +474,7 @@ void putc(const char c)
 		fputc(stdout, c);
 	} else {
 		/* Send directly to the handler */
+		pre_console_putc(c);
 		serial_putc(c);
 	}
 }
@@ -472,6 +506,7 @@ void puts(const char *s)
 		fputs(stdout, s);
 	} else {
 		/* Send directly to the handler */
+		pre_console_puts(s);
 		serial_puts(s);
 	}
 }
@@ -679,7 +714,7 @@ int console_init_f(void)
 		gd->flags |= GD_FLG_SILENT;
 #endif
 
-	print_pre_console_buffer();
+	print_pre_console_buffer(PRE_CONSOLE_FLUSHPOINT1_SERIAL);
 
 	return 0;
 }
@@ -794,6 +829,7 @@ done:
 	if ((stdio_devices[stdin] == NULL) && (stdio_devices[stdout] == NULL))
 		return 0;
 #endif
+	print_pre_console_buffer(PRE_CONSOLE_FLUSHPOINT2_EVERYTHING_BUT_SERIAL);
 	return 0;
 }
 
@@ -869,7 +905,7 @@ int console_init_r(void)
 	if ((stdio_devices[stdin] == NULL) && (stdio_devices[stdout] == NULL))
 		return 0;
 #endif
-
+	print_pre_console_buffer(PRE_CONSOLE_FLUSHPOINT2_EVERYTHING_BUT_SERIAL);
 	return 0;
 }
 
-- 
2.0.5