lcd: allow lcd device to handle mode change events

Some LCD panels are capable of different resolutions, and is allowed
to change at run-time, so to make "struct lcd_device" to be able to
handle mode change events here.

Signed-off-by: Eric Miao <eric.miao@marvell.com>
Acked-by: Krzysztof Helt <krzysztof.h1@wp.pl>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

2 files changed, 16 insertions, 3 deletions

diff --git a/drivers/video/backlight/lcd.c b/drivers/video/backlight/lcd.c
index b15b2b84a6f7..8e1731d3b228 100644
--- a/drivers/video/backlight/lcd.c
+++ b/drivers/video/backlight/lcd.c
@@ -27,14 +27,26 @@ static int fb_notifier_callback(struct notifier_block *self,
         struct fb_event *evdata = data;
 
         /* If we aren't interested in this event, skip it immediately ... */
-        if (event != FB_EVENT_BLANK)
+        switch (event) {
+        case FB_EVENT_BLANK:
+        case FB_EVENT_MODE_CHANGE:
+        case FB_EVENT_MODE_CHANGE_ALL:
+                break;
+        default:
                 return 0;
+        }
 
         ld = container_of(self, struct lcd_device, fb_notif);
+        if (!ld->ops)
+                return 0;
+
         mutex_lock(&ld->ops_lock);
-        if (ld->ops)
-                if (!ld->ops->check_fb || ld->ops->check_fb(ld, evdata->info))
+        if (!ld->ops->check_fb || ld->ops->check_fb(ld, evdata->info)) {
+                if (event == FB_EVENT_BLANK)
                         ld->ops->set_power(ld, *(int *)evdata->data);
+                else
+                        ld->ops->set_mode(ld, evdata->data);
+        }
         mutex_unlock(&ld->ops_lock);
         return 0;
 }
diff --git a/drivers/video/fbmem.c b/drivers/video/fbmem.c
index 98843c2ecf73..0737570030f5 100644
--- a/drivers/video/fbmem.c
+++ b/drivers/video/fbmem.c
@@ -979,6 +979,7 @@ fb_set_var(struct fb_info *info, struct fb_var_screeninfo *var)
 
                                 info->flags &= ~FBINFO_MISC_USEREVENT;
                                 event.info = info;
+                                event.data = &mode;
                                 fb_notifier_call_chain(evnt, &event);
                         }
                 }