In order for fbcon to detach itself from the console layer, vgacon, which is a
boot console driver, must be fixed so it can retake the console multiple
times, not just during init. The following needs to be done:
- remove __init from the vgacon_startup, this is called again by
take_over_console().
- vc->rows and vc->cols are set manually by vgacon during init. After init,
vc_resize() can be used
- make sure the scrollback_buffer is not reallocated
Signed-off-by: Antonino Daplas <[email protected]>
---
drivers/video/console/vgacon.c | 28 ++++++++++++++++++++++------
1 files changed, 22 insertions(+), 6 deletions(-)
diff --git a/drivers/video/console/vgacon.c b/drivers/video/console/vgacon.c
index a595382..01401cd 100644
--- a/drivers/video/console/vgacon.c
+++ b/drivers/video/console/vgacon.c
@@ -114,6 +114,7 @@ static int vga_512_chars;
static int vga_video_font_height;
static int vga_scan_lines;
static unsigned int vga_rolled_over = 0;
+static int vga_init_done;
static int __init no_scroll(char *str)
{
@@ -190,7 +191,7 @@ static void vgacon_scrollback_init(int p
}
}
-static void __init vgacon_scrollback_startup(void)
+static void vgacon_scrollback_startup(void)
{
vgacon_scrollback = alloc_bootmem(CONFIG_VGACON_SOFT_SCROLLBACK_SIZE
* 1024);
@@ -355,7 +356,7 @@ static int vgacon_scrolldelta(struct vc_
}
#endif /* CONFIG_VGACON_SOFT_SCROLLBACK */
-static const char __init *vgacon_startup(void)
+static const char *vgacon_startup(void)
{
const char *display_desc = NULL;
u16 saved1, saved2;
@@ -523,7 +524,12 @@ #endif
vgacon_xres = ORIG_VIDEO_COLS * VGA_FONTWIDTH;
vgacon_yres = vga_scan_lines;
- vgacon_scrollback_startup();
+
+ if (!vga_init_done) {
+ vgacon_scrollback_startup();
+ vga_init_done = 1;
+ }
+
return display_desc;
}
@@ -531,10 +537,20 @@ static void vgacon_init(struct vc_data *
{
unsigned long p;
- /* We cannot be loaded as a module, therefore init is always 1 */
+ /*
+ * We cannot be loaded as a module, therefore init is always 1,
+ * but vgacon_init can be called more than once, and init will
+ * not be 1.
+ */
c->vc_can_do_color = vga_can_do_color;
- c->vc_cols = vga_video_num_columns;
- c->vc_rows = vga_video_num_lines;
+
+ /* set dimensions manually if init != 0 since vc_resize() will fail */
+ if (init) {
+ c->vc_cols = vga_video_num_columns;
+ c->vc_rows = vga_video_num_lines;
+ } else
+ vc_resize(c, vga_video_num_columns, vga_video_num_lines);
+
c->vc_scan_lines = vga_scan_lines;
c->vc_font.height = vga_video_font_height;
c->vc_complement_mask = 0x7700;
-
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