[PATCH 1/1] cmd: add serial console support for the cls command

[Heinrich Schuchardt]

Currently the cls command does not support the serial console

The screen can be cleared in the video uclass, the colored frame buffer
console, and the serial console by sending the same escape sequence.
The cls command only needs a single printf() statement in most cases.

This patch drops support for clearing the DM video without
CONFIG_VIDEO_ANSI=y (which is enabled by default).

Signed-off-by: Heinrich Schuchardt <heinrich.schuchardt at canonical.com>
---
 cmd/cls.c | 23 +++++++++--------------
 1 file changed, 9 insertions(+), 14 deletions(-)

diff --git a/cmd/cls.c b/cmd/cls.c
index eab4e6993b..d58b0facbe 100644
--- a/cmd/cls.c
+++ b/cmd/cls.c
@@ -11,23 +11,18 @@
 #include <lcd.h>
 #include <video.h>
 
+#define ESC "\x1b"
+
 static int do_video_clear(struct cmd_tbl *cmdtp, int flag, int argc,
 			  char *const argv[])
 {
-#if defined(CONFIG_DM_VIDEO)
-	struct udevice *dev;
-
-	if (uclass_first_device_err(UCLASS_VIDEO, &dev))
-		return CMD_RET_FAILURE;
-
-	if (video_clear(dev))
-		return CMD_RET_FAILURE;
-#elif defined(CONFIG_CFB_CONSOLE)
-	video_clear();
-#elif defined(CONFIG_LCD)
-	lcd_clear();
-#else
-	return CMD_RET_FAILURE;
+	/*  Send clear screen and home */
+	printf(ESC "[2J" ESC "[1;1H");
+#if !defined(CONFIG_DM_VIDEO) && !defined(CONFIG_CFB_CONSOLE_ANSI)
+	if (CONFIG_IS_ENABLED(CFB_CONSOLE))
+		video_clear();
+	else if (CONFIG_IS_ENABLED(LCD)
+		lcd_clear();
 #endif
 	return CMD_RET_SUCCESS;
 }
-- 
2.33.1