[Intel-gfx] [PATCH RESEND v4 0/6] Enhancement to intel_dp_aux_backlight driver

[Puthikorn Voravootivat]

Rebase since this is not applied cleanly now.

This patch set contain 6 patches.
- First two patches allow enable DPCD backlight control when panel
  can also do that via PWM pin and fix the usage of enable register.
- Next patch adds enable DBC by default
- Next patch makes the driver restore last brightness level after
  turning display off and on.
- Last two patches set the PWM freqency to match data in panel vbt.

Change log:
v2:
- Drop PWM frequency patch
- Addess suggestion from Jani Nikula

v3:
- Add new implementation of PWM frequency patch

v4:
- Rebase / minor typo fix.

Puthikorn Voravootivat (6):
  drm/i915: Add DPCD preferred mode for backlight control
  drm/i915: Correctly enable blacklight adjustment via DPCD
  drm/i915: Support dynamic backlight via DPCD register
  drm/i915: Store brightness level in aux backlight driver
  drm: Add definition for eDP backlight frequency
  drm/i915: Set PWM divider to match desired frequency in vbt

 drivers/gpu/drm/i915/i915_params.c            |   6 +-
 drivers/gpu/drm/i915/i915_params.h            |   2 +-
 drivers/gpu/drm/i915/intel_dp_aux_backlight.c | 143 +++++++++++++++++++++++---
 include/drm/drm_dp_helper.h                   |   2 +
 4 files changed, 133 insertions(+), 20 deletions(-)

-- 
2.12.2.816.g2cccc81164-goog