[PATCH v11 0/3] Enhancement to intel_dp_aux_backlight driver

[Puthikorn Voravootivat]

This patch set contain 3 patches. Another 6 patches in previous version
was already merged in v7 and v9.
- First patch sets the PWM freqency to match data in panel vbt.
- Next patch adds heuristic to determine whether we should use AUX
  or PWM pin to adjust panel backlight brightness.
- Last patch adds support for dynamic brightness.

Change log:
v11:
- Reorder patches in v10 to make the last patch come first
- Fix nits

v10:
- Add heuristic in patch #1
- Add _unsafe mod option in patch #1, #2
- handle frequency set error in patch #3

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 (3):
  drm/i915: Set PWM divider to match desired frequency in vbt
  drm/i915: Add heuristic to determine better way to adjust brightness
  drm/i915: Add option to support dynamic backlight via DPCD

 drivers/gpu/drm/i915/i915_params.c            |  12 +-
 drivers/gpu/drm/i915/i915_params.h            |   5 +-
 drivers/gpu/drm/i915/intel_dp_aux_backlight.c | 185 ++++++++++++++++++++++++--
 3 files changed, 186 insertions(+), 16 deletions(-)

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2.13.0.506.g27d5fe0cd-goog