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

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Date:   Fri, 22 Nov 2019 18:15:58 -0500
From:   Lyude Paul <lyude@...hat.com>
To:     intel-gfx@...ts.freedesktop.org
Cc:     "Daniel Vetter" <daniel@...ll.ch>,
        "David Airlie" <airlied@...ux.ie>,
        "Maarten Lankhorst" <maarten.lankhorst@...ux.intel.com>,
        "Rodrigo Vivi" <rodrigo.vivi@...el.com>,
        linux-kernel@...r.kernel.org, dri-devel@...ts.freedesktop.org,
        "Imre Deak" <imre.deak@...el.com>,
        "Jani Nikula" <jani.nikula@...ux.intel.com>,
        Ville Syrjälä 
        <ville.syrjala@...ux.intel.com>,
        "Chris Wilson" <chris@...is-wilson.co.uk>,
        "Joonas Lahtinen" <joonas.lahtinen@...ux.intel.com>,
        "Lee Shawn C" <shawn.c.lee@...el.com>,
        "Lyude Paul" <lyude@...hat.com>,
        "Maxime Ripard" <mripard@...nel.org>
Subject: [PATCH 0/5] drm/i915: eDP DPCD aux backlight fixes

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
    panel

 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(-)

-- 
2.21.0