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drm: Add CRTC background color property

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Some display controllers can be hardware programmed to show non-black
colors for pixels that are either not covered by any plane or are
exposed through transparent regions of higher planes.  This feature can
help reduce memory bandwidth usage, e.g. in compositors managing a UI
with a solid background color while using smaller planes to render the
remaining content.

To support this capability, introduce the BACKGROUND_COLOR standard DRM
mode property, which can be attached to a CRTC through the
drm_crtc_attach_background_color_property() helper function.

Additionally, define a 64-bit ARGB format value to be built with the
help of a couple of dedicated DRM_ARGB64_PREP*() helpers.  Individual
color components can be extracted with desired precision using the
corresponding DRM_ARGB64_GET*() macros.

Co-developed-by: Matt Roper <matthew.d.roper@intel.com>
Signed-off-by: Matt Roper <matthew.d.roper@intel.com>
Reviewed-by: Nícolas F. R. A. Prado <nfraprado@collabora.com>
Tested-by: Diederik de Haas <diederik@cknow-tech.com>
Signed-off-by: Cristian Ciocaltea <cristian.ciocaltea@collabora.com>
Link: https://patch.msgid.link/20260303-rk3588-bgcolor-v8-2-fee377037ad1@collabora.com
Signed-off-by: Daniel Stone <daniels@collabora.com>
This commit is contained in:
Cristian Ciocaltea
2026-03-03 21:24:18 +02:00
committed by Daniel Stone
parent de9e2b3d88
commit 4c684596cd
9 changed files with 147 additions and 5 deletions
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6
drivers/gpu/drm/drm_mode_config.c
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@@ -380,6 +380,12 @@ static int drm_mode_create_standard_properties(struct drm_device *dev)
return -ENOMEM;
dev->mode_config.gamma_lut_size_property = prop;
prop = drm_property_create_range(dev, 0,
"BACKGROUND_COLOR", 0, U64_MAX);
if (!prop)
return -ENOMEM;
dev->mode_config.background_color_property = prop;
prop = drm_property_create(dev,
DRM_MODE_PROP_IMMUTABLE | DRM_MODE_PROP_BLOB,
"IN_FORMATS", 0);