Not all systems expose a firmware or platform mechanism for changing the backlight intensity on i915, so add native driver support.
Signed-off-by: Matthew Garrett <mjg@redhat.com> Cc: Richard Purdie <rpurdie@rpsys.net> Cc: Chris Wilson <chris@chris-wilson.co.uk> Cc: David Airlie <airlied@linux.ie> Cc: Alex Deucher <alexdeucher@gmail.com> Cc: Ben Skeggs <bskeggs@redhat.com> Cc: Zhang Rui <rui.zhang@intel.com> Cc: Len Brown <lenb@kernel.org> Cc: Jesse Barnes <jbarnes@virtuousgeek.org> Tested-by: Sedat Dilek <sedat.dilek@googlemail.com> Tested-by: Michel Alexandre Salim <salimma@fedoraproject.org> Tested-by: Kamal Mostafa <kamal@canonical.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Keith Packard <keithp@keithp.com>
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Keith Packard

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@@ -297,9 +297,10 @@ extern void intel_pch_panel_fitting(struct drm_device *dev,
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extern u32 intel_panel_get_max_backlight(struct drm_device *dev);
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extern u32 intel_panel_get_backlight(struct drm_device *dev);
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extern void intel_panel_set_backlight(struct drm_device *dev, u32 level);
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extern void intel_panel_setup_backlight(struct drm_device *dev);
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extern int intel_panel_setup_backlight(struct drm_device *dev);
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extern void intel_panel_enable_backlight(struct drm_device *dev);
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extern void intel_panel_disable_backlight(struct drm_device *dev);
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extern void intel_panel_destroy_backlight(struct drm_device *dev);
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extern enum drm_connector_status intel_panel_detect(struct drm_device *dev);
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extern void intel_crtc_load_lut(struct drm_crtc *crtc);
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