[PATCH] fbcon: Stop cursor timer if console is inactive

If console is blanked or in KD_GRAPHICS mode, delete cursor timer.  No sense
flashing the cursor when there's nothing to be seen.

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

diff --git a/drivers/video/console/fbcon.c b/drivers/video/console/fbcon.c
index bb4ea50..2e93224 100644 (file)
--- a/drivers/video/console/fbcon.c
+++ b/drivers/video/console/fbcon.c
@@ -331,6 +331,35 @@ static void cursor_timer_handler(unsigned long dev_addr)
        mod_timer(&ops->cursor_timer, jiffies + HZ/5);
 }
 
+static void fbcon_add_cursor_timer(struct fb_info *info)
+{
+       struct fbcon_ops *ops = info->fbcon_par;
+
+       if ((!info->queue.func || info->queue.func == fb_flashcursor) &&
+           !(ops->flags & FBCON_FLAGS_CURSOR_TIMER)) {
+               if (!info->queue.func)
+                       INIT_WORK(&info->queue, fb_flashcursor, info);
+
+               init_timer(&ops->cursor_timer);
+               ops->cursor_timer.function = cursor_timer_handler;
+               ops->cursor_timer.expires = jiffies + HZ / 5;
+               ops->cursor_timer.data = (unsigned long ) info;
+               add_timer(&ops->cursor_timer);
+               ops->flags |= FBCON_FLAGS_CURSOR_TIMER;
+       }
+}
+
+static void fbcon_del_cursor_timer(struct fb_info *info)
+{
+       struct fbcon_ops *ops = info->fbcon_par;
+
+       if (info->queue.func == fb_flashcursor &&
+           ops->flags & FBCON_FLAGS_CURSOR_TIMER) {
+               del_timer_sync(&ops->cursor_timer);
+               ops->flags &= ~FBCON_FLAGS_CURSOR_TIMER;
+       }
+}
+
 #ifndef MODULE
 static int __init fb_console_setup(char *this_opt)
 {
@@ -583,9 +612,7 @@ static int con2fb_release_oldinfo(struct vc_data *vc, struct fb_info *oldinfo,
        }
 
        if (!err) {
-               if (oldinfo->queue.func == fb_flashcursor)
-                       del_timer_sync(&ops->cursor_timer);
-
+               fbcon_del_cursor_timer(oldinfo);
                kfree(ops->cursor_state.mask);
                kfree(ops->cursor_data);
                kfree(oldinfo->fbcon_par);
@@ -596,22 +623,6 @@ static int con2fb_release_oldinfo(struct vc_data *vc, struct fb_info *oldinfo,
        return err;
 }
 
-static void con2fb_init_newinfo(struct fb_info *info)
-{
-       if (!info->queue.func || info->queue.func == fb_flashcursor) {
-               struct fbcon_ops *ops = info->fbcon_par;
-
-               if (!info->queue.func)
-                       INIT_WORK(&info->queue, fb_flashcursor, info);
-
-               init_timer(&ops->cursor_timer);
-               ops->cursor_timer.function = cursor_timer_handler;
-               ops->cursor_timer.expires = jiffies + HZ / 5;
-               ops->cursor_timer.data = (unsigned long ) info;
-               add_timer(&ops->cursor_timer);
-       }
-}
-
 static void con2fb_init_display(struct vc_data *vc, struct fb_info *info,
                                int unit, int show_logo)
 {
@@ -695,7 +706,7 @@ static int set_con2fb_map(int unit, int newidx, int user)
                                 logo_shown != FBCON_LOGO_DONTSHOW);
 
                if (!found)
-                       con2fb_init_newinfo(info);
+                       fbcon_add_cursor_timer(info);
                con2fb_map_boot[unit] = newidx;
                con2fb_init_display(vc, info, unit, show_logo);
        }
@@ -898,18 +909,7 @@ static const char *fbcon_startup(void)
        }
 #endif                         /* CONFIG_MAC */
 
-       /* Initialize the work queue. If the driver provides its
-        * own work queue this means it will use something besides 
-        * default timer to flash the cursor. */
-       if (!info->queue.func) {
-               INIT_WORK(&info->queue, fb_flashcursor, info);
-
-               init_timer(&ops->cursor_timer);
-               ops->cursor_timer.function = cursor_timer_handler;
-               ops->cursor_timer.expires = jiffies + HZ / 5;
-               ops->cursor_timer.data = (unsigned long ) info;
-               add_timer(&ops->cursor_timer);
-       }
+       fbcon_add_cursor_timer(info);
        return display_desc;
 }
 
@@ -1923,7 +1923,7 @@ static int fbcon_resize(struct vc_data *vc, unsigned int width,
 
 static int fbcon_switch(struct vc_data *vc)
 {
-       struct fb_info *info;
+       struct fb_info *info, *old_info = NULL;
        struct display *p = &fb_display[vc->vc_num];
        struct fb_var_screeninfo var;
        int i, prev_console;
@@ -1956,7 +1956,8 @@ static int fbcon_switch(struct vc_data *vc)
        }
 
        prev_console = ((struct fbcon_ops *)info->fbcon_par)->currcon;
-
+       if (prev_console != -1)
+               old_info = registered_fb[con2fb_map[prev_console]];
        /*
         * FIXME: If we have multiple fbdev's loaded, we need to
         * update all info->currcon.  Perhaps, we can place this
@@ -1984,10 +1985,12 @@ static int fbcon_switch(struct vc_data *vc)
        info->var.yoffset = info->var.xoffset = p->yscroll = 0;
        fb_set_var(info, &var);
 
-       if (prev_console != -1 &&
-           registered_fb[con2fb_map[prev_console]] != info &&
-           info->fbops->fb_set_par)
-               info->fbops->fb_set_par(info);
+       if (old_info != NULL && old_info != info) {
+               if (info->fbops->fb_set_par)
+                       info->fbops->fb_set_par(info);
+               fbcon_del_cursor_timer(old_info);
+               fbcon_add_cursor_timer(info);
+       }
 
        set_blitting_type(vc, info, p);
        ((struct fbcon_ops *)info->fbcon_par)->cursor_reset = 1;
@@ -2073,11 +2076,16 @@ static int fbcon_blank(struct vc_data *vc, int blank, int mode_switch)
                                fbcon_generic_blank(vc, info, blank);
                }
 
-               if (!blank)
-                       update_screen(vc);
-       }
+               if (!blank)
+                       update_screen(vc);
+       }
+
+       if (!blank)
+               fbcon_add_cursor_timer(info);
+       else
+               fbcon_del_cursor_timer(info);
 
-       return 0;
+       return 0;
 }
 
 static void fbcon_free_font(struct display *p)

diff --git a/drivers/video/console/fbcon.h b/drivers/video/console/fbcon.h
index 5d37786..08befaf 100644 (file)
--- a/drivers/video/console/fbcon.h
+++ b/drivers/video/console/fbcon.h
@@ -18,7 +18,8 @@
 
 #include <asm/io.h>
 
-#define FBCON_FLAGS_INIT 1
+#define FBCON_FLAGS_INIT         1
+#define FBCON_FLAGS_CURSOR_TIMER 2
 
    /*
     *    This is the interface between the low-level console driver and the