[PATCH v9 0/5] Enhancement to intel_dp_aux_backlight driver

[Puthikorn Voravootivat]

This patch set contain 5 patches. Another 4 patches in previous version
was already merged in v7.
- First two patches allow choosing which way to adjust brightness
  if both PWM pin and AUX are supported
- Next patch adds support for dynamic brightness.
- Last two patches set the PWM freqency to match data in panel vbt.

Change log:
v9:
- Fix nits in v8

v8:
- Drop 4 patches that was already merged
- Move DP_EDP_BACKLIGHT_AUX_ENABLE_CAP check to patch #2 to avoid
  behavior change if only apply patch #1
- Add TODO to warn about enable backlight twice in patch #2
- Use DIV_ROUND_CLOSEST instead of just "/" in patch #5
- Fix bug calculate pn in patch #5
- Clarify commit  message / code comment in patch #5

v7:
- Add check in intel_dp_pwm_pin_display_control_capable in patch #4
- Add option in patch #6 to enable DPCD or not
- Change definition in patch #8 and implementation in #9 to use Khz
- Fix compiler warning from build bot in patch #9

v6:
- Address review from Dhinakaran
- Make PWM frequency to have highest value of Pn that make the
  frequency still within 25% of desired frequency.

v5:
- Split first patch in v4 to 3 patches
- Bump priority for "Correctly enable backlight brightness adjustment via DPCD"
- Make logic clearer for the case that both PWM pin and AUX are supported
- Add more log when write to register fail
- Add log when enable DBC

v4:
- Rebase / minor typo fix.

v3:
- Add new implementation of PWM frequency patch

v2:
- Drop PWM frequency patch
- Address suggestion from Jani Nikula

Puthikorn Voravootivat (5):
  drm/i915: Drop AUX backlight enable check for backlight control
  drm/i915: Allow choosing how to adjust brightness if both supported
  drm/i915: Add option to support dynamic backlight via DPCD
  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            |  13 ++-
 drivers/gpu/drm/i915/i915_params.h            |   5 +-
 drivers/gpu/drm/i915/intel_dp_aux_backlight.c | 156 +++++++++++++++++++++++---
 include/drm/drm_dp_helper.h                   |   2 +
 4 files changed, 157 insertions(+), 19 deletions(-)

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2.13.0.219.gdb65acc882-goog