[PATCH] fbdev: Add fbset -a support

Add capability to fbdev to listen to the FB_ACTIVATE_ALL flag.  If set, it
notifies fbcon that all consoles must be set to the current var.

Signed-off-by: Antonino Daplas <adaplas@pol.net>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

3 files changed, 55 insertions, 2 deletions

diff --git a/drivers/video/console/fbcon.c b/drivers/video/console/fbcon.c
index 35c88bd7ba5e..751890a5f5f3 100644
--- a/drivers/video/console/fbcon.c
+++ b/drivers/video/console/fbcon.c
@@ -2593,6 +2593,51 @@ static void fbcon_modechanged(struct fb_info *info)
         }
 }
 
+static void fbcon_set_all_vcs(struct fb_info *info)
+{
+        struct fbcon_ops *ops = info->fbcon_par;
+        struct vc_data *vc;
+        struct display *p;
+        int i, rows, cols;
+
+        if (!ops || ops->currcon < 0)
+                return;
+
+        for (i = 0; i < MAX_NR_CONSOLES; i++) {
+                vc = vc_cons[i].d;
+                if (!vc || vc->vc_mode != KD_TEXT ||
+                    registered_fb[con2fb_map[i]] != info)
+                        continue;
+
+                p = &fb_display[vc->vc_num];
+
+                info->var.xoffset = info->var.yoffset = p->yscroll = 0;
+                var_to_display(p, &info->var, info);
+                cols = info->var.xres / vc->vc_font.width;
+                rows = info->var.yres / vc->vc_font.height;
+                vc_resize(vc, cols, rows);
+
+                if (CON_IS_VISIBLE(vc)) {
+                        updatescrollmode(p, info, vc);
+                        scrollback_max = 0;
+                        scrollback_current = 0;
+                        update_var(vc->vc_num, info);
+                        fbcon_set_palette(vc, color_table);
+                        update_screen(vc);
+                        if (softback_buf) {
+                                int l = fbcon_softback_size / vc->vc_size_row;
+                                if (l > 5)
+                                        softback_end = softback_buf + l * vc->vc_size_row;
+                                else {
+                                        /* Smaller scrollback makes no sense, and 0
+                                           would screw the operation totally */
+                                        softback_top = 0;
+                                }
+                        }
+                }
+        }
+}
+
 static int fbcon_mode_deleted(struct fb_info *info,
                               struct fb_videomode *mode)
 {
@@ -2708,6 +2753,9 @@ static int fbcon_event_notify(struct notifier_block *self,
         case FB_EVENT_MODE_CHANGE:
                 fbcon_modechanged(info);
                 break;
+        case FB_EVENT_MODE_CHANGE_ALL:
+                fbcon_set_all_vcs(info);
+                break;
         case FB_EVENT_MODE_DELETE:
                 mode = event->data;
                 ret = fbcon_mode_deleted(info, mode);
diff --git a/drivers/video/fbmem.c b/drivers/video/fbmem.c
index 4ff853fbe0be..a8eee79e117d 100644
--- a/drivers/video/fbmem.c
+++ b/drivers/video/fbmem.c
@@ -684,11 +684,13 @@ fb_set_var(struct fb_info *info, struct fb_var_screeninfo *var)
 
                         if (!err && (flags & FBINFO_MISC_USEREVENT)) {
                                 struct fb_event event;
+                                int evnt = (var->activate & FB_ACTIVATE_ALL) ?
+                                        FB_EVENT_MODE_CHANGE_ALL :
+                                        FB_EVENT_MODE_CHANGE;
 
                                 info->flags &= ~FBINFO_MISC_USEREVENT;
                                 event.info = info;
-                                notifier_call_chain(&fb_notifier_list,
-                                                    FB_EVENT_MODE_CHANGE,
+                                notifier_call_chain(&fb_notifier_list, evnt,
                                                     &event);
                         }
                 }
diff --git a/include/linux/fb.h b/include/linux/fb.h
index bc24beeed971..70da819df0f5 100644
--- a/include/linux/fb.h
+++ b/include/linux/fb.h
@@ -495,6 +495,9 @@ struct fb_cursor_user {
 #define FB_EVENT_BLANK                  0x08
 /*      Private modelist is to be replaced */
 #define FB_EVENT_NEW_MODELIST           0x09
+/*      The resolution of the passed in fb_info about to change and
+        all vc's should be changed         */
+#define FB_EVENT_MODE_CHANGE_ALL        0x0A
 
 struct fb_event {
         struct fb_info *info;