[PATCH 0/5] drm/i915: eDP DPCD aux backlight fixes

From: Lyude Paul
Date: Fri Nov 22 2019 - 18:16:35 EST

I recently got a ThinkPad X1 Extreme 2nd Generation for fixing some
issues on, and noticed that out of the box the backlight doesn't work.
Along the way of fixing that, I found a few issues with how i915 handles
DPCD AUX backlight control and fixed them. Now I've got working
backlight controls, hooray!

Note that this patch series also enables DPCD aux backlight control by
default based on what the VBT tells us.

Lyude Paul (5):
drm/i915: Fix eDP DPCD aux max backlight calculations
drm/i915: Assume 100% brightness when not in DPCD control mode
drm/i915: Fix DPCD register order in intel_dp_aux_enable_backlight()
drm/i915: Auto detect DPCD backlight support by default
drm/i915: Force DPCD backlight mode on X1 Extreme 2nd Gen 4K AMOLED

drivers/gpu/drm/drm_dp_helper.c | 4 +
.../drm/i915/display/intel_display_types.h | 3 +
.../drm/i915/display/intel_dp_aux_backlight.c | 167 ++++++++++++------
drivers/gpu/drm/i915/i915_params.c | 2 +-
drivers/gpu/drm/i915/i915_params.h | 2 +-
include/drm/drm_dp_helper.h | 8 +
6 files changed, 134 insertions(+), 52 deletions(-)