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drm/i915: keep backlight_level and backlight device brightness in sync

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A single point of truth would be better than two, but achieving that would
require more abstractions for CONFIG_BACKLIGHT_CLASS_DEVICE=n with not a
whole lot of real benefits. Take the short route and just keep the
backlight levels in sync. In particular, update backlight device brightness
on opregion brightness changes.

Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
This commit is contained in:
Jani Nikula 2013-03-12 11:44:15 +02:00 committed by Daniel Vetter
parent 73c352a265
commit b6b3ba5b22
1 changed files with 9 additions and 2 deletions
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11
drivers/gpu/drm/i915/intel_panel.c
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@ -287,6 +287,9 @@ void intel_panel_set_backlight(struct drm_device *dev, u32 level)
struct drm_i915_private *dev_priv = dev->dev_private;
dev_priv->backlight_level = level;
if (dev_priv->backlight)
dev_priv->backlight->props.brightness = level;
if (dev_priv->backlight_enabled)
intel_panel_actually_set_backlight(dev, level);
}
@ -318,8 +321,12 @@ void intel_panel_enable_backlight(struct drm_device *dev,
{
struct drm_i915_private *dev_priv = dev->dev_private;
if (dev_priv->backlight_level == 0)
if (dev_priv->backlight_level == 0) {
dev_priv->backlight_level = intel_panel_get_max_backlight(dev);
if (dev_priv->backlight)
dev_priv->backlight->props.brightness =
dev_priv->backlight_level;
}
dev_priv->backlight_enabled = true;
intel_panel_actually_set_backlight(dev, dev_priv->backlight_level);
@ -427,6 +434,7 @@ int intel_panel_setup_backlight(struct drm_connector *connector)
memset(&props, 0, sizeof(props));
props.type = BACKLIGHT_RAW;
props.brightness = dev_priv->backlight_level;
props.max_brightness = _intel_panel_get_max_backlight(dev);
if (props.max_brightness == 0) {
DRM_DEBUG_DRIVER("Failed to get maximum backlight value\n");
@ -443,7 +451,6 @@ int intel_panel_setup_backlight(struct drm_connector *connector)
dev_priv->backlight = NULL;
return -ENODEV;
}
dev_priv->backlight->props.brightness = intel_panel_get_backlight(dev);
return 0;
}