From 8c16f3303c3410d4af19c8bdc73b74c83c042e87 Mon Sep 17 00:00:00 2001 From: Liu Ying Date: Thu, 3 Apr 2014 14:48:55 -0700 Subject: [PATCH] backlight: update backlight status when necessary We don't have to update a backlight status every time a blanking or unblanking event comes because the backlight status may have already been what we want. Another thought is that one backlight device may be shared by multiple framebuffers. We don't hope blanking one of the framebuffers may turn the backlight off for all the other framebuffers, since they are likely being active to display something. This patch makes the backlight status be updated only when the relevant backlight device's use count changes from zero to one or from one to zero. Signed-off-by: Liu Ying Cc: Jingoo Han Cc: Jean-Christophe PLAGNIOL-VILLARD Cc: Tomi Valkeinen Cc: Jani Nikula Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- drivers/video/backlight/backlight.c | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-) diff --git a/drivers/video/backlight/backlight.c b/drivers/video/backlight/backlight.c index efc9a2da918d..27d3cf255e78 100644 --- a/drivers/video/backlight/backlight.c +++ b/drivers/video/backlight/backlight.c @@ -34,7 +34,7 @@ static const char *const backlight_types[] = { defined(CONFIG_BACKLIGHT_CLASS_DEVICE_MODULE)) /* This callback gets called when something important happens inside a * framebuffer driver. We're looking if that important event is blanking, - * and if it is, we're switching backlight power as well ... + * and if it is and necessary, we're switching backlight power as well ... */ static int fb_notifier_callback(struct notifier_block *self, unsigned long event, void *data) @@ -60,6 +60,7 @@ static int fb_notifier_callback(struct notifier_block *self, if (!bd->use_count++) { bd->props.state &= ~BL_CORE_FBBLANK; bd->props.fb_blank = FB_BLANK_UNBLANK; + backlight_update_status(bd); } } else if (fb_blank != FB_BLANK_UNBLANK && bd->fb_bl_on[node]) { @@ -67,9 +68,9 @@ static int fb_notifier_callback(struct notifier_block *self, if (!(--bd->use_count)) { bd->props.state |= BL_CORE_FBBLANK; bd->props.fb_blank = fb_blank; + backlight_update_status(bd); } } - backlight_update_status(bd); } mutex_unlock(&bd->ops_lock); return 0; -- 2.39.5