drm/i915: panel: invert brightness via quirk

[pandora-kernel.git] / drivers / gpu / drm / i915 / intel_panel.c

diff --git a/drivers/gpu/drm/i915/intel_panel.c b/drivers/gpu/drm/i915/intel_panel.c
index d38a783..72b8949 100644 (file)
--- a/drivers/gpu/drm/i915/intel_panel.c
+++ b/drivers/gpu/drm/i915/intel_panel.c
@@ -192,15 +192,22 @@ u32 intel_panel_get_max_backlight(struct drm_device *dev)
        return max;
 }
 
-static bool i915_panel_invert_brightness;
-MODULE_PARM_DESC(invert_brightness, "Invert backlight brightness, please "
+static int i915_panel_invert_brightness;
+MODULE_PARM_DESC(invert_brightness, "Invert backlight brightness "
+       "(-1 force normal, 0 machine defaults, 1 force inversion), please "
        "report PCI device ID, subsystem vendor and subsystem device ID "
        "to dri-devel@lists.freedesktop.org, if your machine needs it. "
        "It will then be included in an upcoming module version.");
-module_param_named(invert_brightness, i915_panel_invert_brightness, bool, 0600);
+module_param_named(invert_brightness, i915_panel_invert_brightness, int, 0600);
 static u32 intel_panel_compute_brightness(struct drm_device *dev, u32 val)
 {
-       if (i915_panel_invert_brightness)
+       struct drm_i915_private *dev_priv = dev->dev_private;
+
+       if (i915_panel_invert_brightness < 0)
+               return val;
+
+       if (i915_panel_invert_brightness > 0 ||
+           dev_priv->quirks & QUIRK_INVERT_BRIGHTNESS)
                return intel_panel_get_max_backlight(dev) - val;
 
        return val;