x86: video: Add support for CONFIG_CONSOLE_SCROLL_LINES

Some machines are very slow to scroll their displays. To cope with this,
support the CONFIG_CONSOLE_SCROLL_LINES option. Setting this to 5 allows
the display to operate at an acceptable speed by scrolling 5 lines at
a time.

This same option is available for LCDs so when these systems are unified
this code can be unified also.

Signed-off-by: Simon Glass <sjg@chromium.org>
Acked-by: Anatolij Gustschin <agust@denx.de>

diff --git a/drivers/video/cfb_console.c b/drivers/video/cfb_console.c
index d4226e3eb6f44c3af7f51af033c25a8a130facf4..a81affa3333f743ed6e56e8758a6fab98addf003 100644 (file)
--- a/drivers/video/cfb_console.c
+++ b/drivers/video/cfb_console.c
@@ -299,7 +299,11 @@ void console_cursor(int state);
 #define CONSOLE_ROW_SECOND     (video_console_address + CONSOLE_ROW_SIZE)
 #define CONSOLE_ROW_LAST       (video_console_address + CONSOLE_SIZE - CONSOLE_ROW_SIZE)
 #define CONSOLE_SIZE           (CONSOLE_ROW_SIZE * CONSOLE_ROWS)
-#define CONSOLE_SCROLL_SIZE    (CONSOLE_SIZE - CONSOLE_ROW_SIZE)
+
+/* By default we scroll by a single line */
+#ifndef CONFIG_CONSOLE_SCROLL_LINES
+#define CONFIG_CONSOLE_SCROLL_LINES 1
+#endif
 
 /* Macros */
 #ifdef VIDEO_FB_LITTLE_ENDIAN
@@ -740,26 +744,33 @@ static void console_clear_line(int line, int begin, int end)
 
 static void console_scrollup(void)
 {
+       const int rows = CONFIG_CONSOLE_SCROLL_LINES;
+       int i;
+
        /* copy up rows ignoring the first one */
 
 #ifdef VIDEO_HW_BITBLT
        video_hw_bitblt(VIDEO_PIXEL_SIZE,       /* bytes per pixel */
                        0,                      /* source pos x */
                        video_logo_height +
-                               VIDEO_FONT_HEIGHT, /* source pos y */
+                               VIDEO_FONT_HEIGHT * rows, /* source pos y */
                        0,                      /* dest pos x */
                        video_logo_height,      /* dest pos y */
                        VIDEO_VISIBLE_COLS,     /* frame width */
                        VIDEO_VISIBLE_ROWS
                        - video_logo_height
-                       - VIDEO_FONT_HEIGHT     /* frame height */
+                       - VIDEO_FONT_HEIGHT * rows      /* frame height */
                );
 #else
-       memcpyl(CONSOLE_ROW_FIRST, CONSOLE_ROW_SECOND,
-               CONSOLE_SCROLL_SIZE >> 2);
+       memcpyl(CONSOLE_ROW_FIRST, CONSOLE_ROW_FIRST + rows * CONSOLE_ROW_SIZE,
+               (CONSOLE_SIZE - CONSOLE_ROW_SIZE * rows) >> 2);
 #endif
        /* clear the last one */
-       console_clear_line(CONSOLE_ROWS - 1, 0, CONSOLE_COLS - 1);
+       for (i = 1; i <= rows; i++)
+               console_clear_line(CONSOLE_ROWS - i, 0, CONSOLE_COLS - 1);
+
+       /* Decrement row number */
+       console_row -= rows;
 }
 
 static void console_back(void)
@@ -871,9 +882,6 @@ static void console_newline(int n)
        if (console_row >= CONSOLE_ROWS) {
                /* Scroll everything up */
                console_scrollup();
-
-               /* Decrement row number */
-               console_row = CONSOLE_ROWS - 1;
        }
 }