From: Jani Nikula <jani.nikula@intel.com>
Date: Tue, 12 Aug 2014 14:11:42 +0000 (+0300)
Subject: drm/i915: switch off backlight for backlight class 0 brightness
X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=e6755fb78e8f20ecadf2a4080084121336624ad9;p=linux-beck.git

drm/i915: switch off backlight for backlight class 0 brightness

Make backlight class sysfs brightness 0 value switch off the backlight
for connectors that have the backlight_power callback defined. For eDP,
this has the similar caveats regarding power savings as bl_power as only
the power sequencer backlight control is switched off.

Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Reviewed_by: Clinton Taylor <Clinton.A.Taylor@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
---

diff --git a/drivers/gpu/drm/i915/intel_panel.c b/drivers/gpu/drm/i915/intel_panel.c
index af5435634929..764f9283e572 100644
--- a/drivers/gpu/drm/i915/intel_panel.c
+++ b/drivers/gpu/drm/i915/intel_panel.c
@@ -986,7 +986,8 @@ static int intel_backlight_device_update_status(struct backlight_device *bd)
 	 */
 	if (panel->backlight.enabled) {
 		if (panel->backlight_power) {
-			bool enable = bd->props.power == FB_BLANK_UNBLANK;
+			bool enable = bd->props.power == FB_BLANK_UNBLANK &&
+				bd->props.brightness != 0;
 			panel->backlight_power(connector, enable);
 		}
 	} else {