[PATCH v2] drm/i915/panel: Alwyas record the backlight level again (but cleverly)

[Takashi Iwai <tiwai@suse.de>]

The commit 47356eb67285014527a5ab87543ba1fae3d1e10a introduced a
mechanism to record the backlight level only at disabling time, but it
also introduced a regression.  Since intel_lvds_enable() may be called
without disabling (e.g. intel_lvds_commit() calls it unconditionally),
the backlight gets back to the last recorded value.  For example, this
happens when you dim the backlight, close the lid and open the lid,
then the backlight suddenly goes to the brightest.

This patch fixes the bug by recording the backlight level always
when changed via intel_panel_set_backlight().  And,
intel_panel_{enable|disable}_backlight() call the internal function not
to update the recorded level wrongly.

Cc: <stable@kernel.org>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
---
Tested on 3.1-rc9 and 3.0.6 kernels.

v1->v2:
  make an internal intel_panel_actually_set_backlight() and call from
  enable/disable functions for tracking the level during disabled too.

 drivers/gpu/drm/i915/intel_panel.c |   21 +++++++++++++--------
 1 files changed, 13 insertions(+), 8 deletions(-)

diff --git a/drivers/gpu/drm/i915/intel_panel.c b/drivers/gpu/drm/i915/intel_panel.c
index a9e0c7b..af08ff3 100644
--- a/drivers/gpu/drm/i915/intel_panel.c
+++ b/drivers/gpu/drm/i915/intel_panel.c
@@ -226,7 +226,7 @@ static void intel_pch_panel_set_backlight(struct drm_device *dev, u32 level)
 	I915_WRITE(BLC_PWM_CPU_CTL, val | level);
 }
 
-void intel_panel_set_backlight(struct drm_device *dev, u32 level)
+static void intel_panel_actually_set_backlight(struct drm_device *dev, u32 level)
 {
 	struct drm_i915_private *dev_priv = dev->dev_private;
 	u32 tmp;
@@ -254,16 +254,21 @@ void intel_panel_set_backlight(struct drm_device *dev, u32 level)
 	I915_WRITE(BLC_PWM_CTL, tmp | level);
 }
 
-void intel_panel_disable_backlight(struct drm_device *dev)
+void intel_panel_set_backlight(struct drm_device *dev, u32 level)
 {
 	struct drm_i915_private *dev_priv = dev->dev_private;
 
-	if (dev_priv->backlight_enabled) {
-		dev_priv->backlight_level = intel_panel_get_backlight(dev);
-		dev_priv->backlight_enabled = false;
-	}
+	dev_priv->backlight_level = level;
+	if (dev_priv->backlight_enabled)
+		intel_panel_actually_set_backlight(dev, level);
+}
+
+void intel_panel_disable_backlight(struct drm_device *dev)
+{
+	struct drm_i915_private *dev_priv = dev->dev_private;
 
-	intel_panel_set_backlight(dev, 0);
+	dev_priv->backlight_enabled = false;
+	intel_panel_actually_set_backlight(dev, 0);
 }
 
 void intel_panel_enable_backlight(struct drm_device *dev)
@@ -273,8 +278,8 @@ void intel_panel_enable_backlight(struct drm_device *dev)
 	if (dev_priv->backlight_level == 0)
 		dev_priv->backlight_level = intel_panel_get_max_backlight(dev);
 
-	intel_panel_set_backlight(dev, dev_priv->backlight_level);
 	dev_priv->backlight_enabled = true;
+	intel_panel_actually_set_backlight(dev, dev_priv->backlight_level);
 }
 
 static void intel_panel_init_backlight(struct drm_device *dev)
-- 
1.7.7