video: Provide a left margin for the text console

Allow the left margin to be set so that text does not have to be right up
against the left side. On some panels this makes it hard to read.

Signed-off-by: Simon Glass <sjg@chromium.org>

drivers/video/vidconsole-uclass.c

@@ -53,7 +53,7 @@ static void vidconsole_back(struct udevice *dev)
 	struct vidconsole_priv *priv = dev_get_uclass_priv(dev);
 
 	priv->xcur_frac -= VID_TO_POS(priv->x_charsize);
-	if (priv->xcur_frac < 0) {
+	if (priv->xcur_frac < priv->xstart_frac) {
 		priv->xcur_frac = (priv->cols - 1) *
 			VID_TO_POS(priv->x_charsize);
 		priv->ycur -= priv->y_charsize;
@@ -71,7 +71,7 @@ static void vidconsole_newline(struct udevice *dev)
 	const int rows = CONFIG_CONSOLE_SCROLL_LINES;
 	int i;
 
-	priv->xcur_frac = 0;
+	priv->xcur_frac = priv->xstart_frac;
 	priv->ycur += priv->y_charsize;
 
 	/* Check if we need to scroll the terminal */
@@ -95,7 +95,7 @@ int vidconsole_put_char(struct udevice *dev, char ch)
 		/* beep */
 		break;
 	case '\r':
-		priv->xcur_frac = 0;
+		priv->xcur_frac = priv->xstart_frac;
 		break;
 	case '\n':
 		vidconsole_newline(dev);

include/video_console.h

@@ -27,6 +27,7 @@
  * @y_charsize:	Character height in pixels
  * @tab_width_frac:	Tab width in fractional units
  * @xsize_frac:	Width of the display in fractional units
+ * @xstart_frac:	Left margin for the text console in fractional units
  */
 struct vidconsole_priv {
 	struct stdio_dev sdev;
@@ -38,6 +39,7 @@ struct vidconsole_priv {
 	int y_charsize;
 	int tab_width_frac;
 	int xsize_frac;
+	int xstart_frac;
 };
 
 /**