[PATCH 0/4] drm/i915: backlight sysfs bl_power and brightness == 0

[Jani Nikula <jani.nikula@intel.com>]

This series adds support for backlight class sysfs bl_power attribute
for eDP panels, which allows switching the backlight on/off. This is
done using the eDP panel power control as a sub-state of everything else
being enabled. Patch 4 also makes 0 brightness switch off the eDP
backlight using the same mechanism. This is all eDP specific, with no
support for LVDS.

I'm not particularly fond of these patches, but there appears to be
demand for them, particularly since

commit 6dda730e55f412a6dfb181cae6784822ba463847
Author: Jani Nikula <jani.nikula@intel.com>
Date:   Tue Jun 24 18:27:40 2014 +0300

    drm/i915: respect the VBT minimum backlight brightness

All the discussions seem to just drag on and on without code to speak
about, so here goes. I've tried to make this as simple and unintrusive
as possible.

BR,
Jani.


Jani Nikula (4):
  drm/i915/dp: split up panel power control from backlight pwm control
  drm/i915: add some framework for backlight bl_power support
  drm/i915/dp: make backlight bl_power control power sequencer backlight
  drm/i915: switch off backlight for backlight class 0 brightness

 drivers/gpu/drm/i915/intel_dp.c    | 61 ++++++++++++++++++++++++++++++--------
 drivers/gpu/drm/i915/intel_drv.h   |  2 ++
 drivers/gpu/drm/i915/intel_panel.c | 27 +++++++++++++++++
 3 files changed, 77 insertions(+), 13 deletions(-)

-- 
1.9.1