[RFC v5 0/9] drm: Extract DPCD backlight helpers from i915, add support in nouveau

[Lyude Paul]

This series:
* Cleans up i915's DPCD backlight code a little bit
* Extracts i915's DPCD backlight code into a set of shared DRM helpers
* Starts using those helpers in nouveau to add support to nouveau for
  DPCD backlight control

v2 series-wide changes:
* Rebase
v3 series-wide changes:
* Split up the changes to intel's backlight code into separate patches
v4 series-wide changes:
* Don't forget to actually include the patch that starts using these
  helpers in nouveau
v5 series-wide changes:
* Rebase
* Use new drm_dbg_*() logging helpers

Lyude Paul (9):
  drm/i915/dpcd_bl: Remove redundant AUX backlight frequency
    calculations
  drm/i915/dpcd_bl: Handle drm_dpcd_read/write() return values correctly
  drm/i915/dpcd_bl: Cleanup intel_dp_aux_vesa_enable_backlight() a bit
  drm/i915/dpcd_bl: Cache some backlight capabilities in
    intel_panel.backlight
  drm/i915/dpcd_bl: Move VESA backlight enabling code closer together
  drm/i915/dpcd_bl: Return early in vesa_calc_max_backlight if we can't
    read PWMGEN_BIT_COUNT
  drm/i915/dpcd_bl: Print return codes for VESA backlight failures
  drm/dp: Extract i915's eDP backlight code into DRM helpers
  drm/nouveau/kms/nv50-: Add basic DPCD backlight support for nouveau

 drivers/gpu/drm/drm_dp_helper.c               | 347 ++++++++++++++++++
 .../drm/i915/display/intel_display_types.h    |   2 +-
 .../drm/i915/display/intel_dp_aux_backlight.c | 329 ++---------------
 drivers/gpu/drm/nouveau/dispnv50/disp.c       |  28 ++
 drivers/gpu/drm/nouveau/nouveau_backlight.c   | 166 ++++++++-
 drivers/gpu/drm/nouveau/nouveau_connector.h   |   9 +-
 drivers/gpu/drm/nouveau/nouveau_encoder.h     |   1 +
 include/drm/drm_dp_helper.h                   |  48 +++
 8 files changed, 622 insertions(+), 308 deletions(-)

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2.30.2