[PATCH 0/2] Add support for Panel Power Savings property

[Mario Limonciello]

During the Display Next hackfest 2024 one of the topics discussed
was the need for compositor to be able to relay intention to drivers
that color fidelity is preferred over power savings.

To accomplish this a new optional DRM property is being introduced called
"panel power saving".  This property is an enum that can be configured
by the compositor to "Allowed" or "Forbidden".

When a driver advertises support for this property and the compositor
sets it to "Forbidden" then the driver will disable any power saving
features that can compromise color fidelity.

In practice the main feature this currently applies to is the
"Adaptive Backlight Modulation" feature within AMD DCN on eDP panels.

When the compositor has marked the property  "Forbidden" then this
feature will be disabled and any userspace that tries to turn it on
will get an -EBUSY return code.

When the compositor has restored the value back to "Allowed" then the
previous value that would have been programmed will be restored.

Mario Limonciello (2):
  drm: Introduce panel_power_saving drm property
  drm/amd: Add panel_power_saving drm property to eDP connectors

 drivers/gpu/drm/amd/amdgpu/amdgpu_display.c   |  3 ++
 .../gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c | 34 ++++++++++++++---
 .../gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.h |  1 +
 drivers/gpu/drm/drm_connector.c               | 37 +++++++++++++++++++
 include/drm/drm_connector.h                   |  1 +
 include/drm/drm_mode_config.h                 |  6 +++
 include/uapi/drm/drm_mode.h                   |  4 ++
 7 files changed, 81 insertions(+), 5 deletions(-)

-- 
2.45.0