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drm/blend: Add a generic alpha property

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Some drivers duplicate the logic to create a property to store a per-plane
alpha.

This is especially useful if we ever want to support extra protocols for
Wayland like:
https://lists.freedesktop.org/archives/wayland-devel/2017-August/034741.html

Let's create a helper in order to move that to the core.

Acked-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Acked-by: Sean Paul <seanpaul@chromium.org>
Reviewed-by: Boris Brezillon <boris.brezillon@bootlin.com>
Reviewed-by: Eric Anholt <eric@anholt.net>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Paul Kocialkowski <paul.kocialkowski@bootlin.com>
Signed-off-by: Maxime Ripard <maxime.ripard@bootlin.com>
Link: https://patchwork.freedesktop.org/patch/msgid/6e1ce0db78fcfc407e94913c64819e65109d034d.1523432341.git-series.maxime.ripard@bootlin.com
This commit is contained in:
Maxime Ripard
2018-04-11 09:39:25 +02:00
parent a08fc7c805
commit ae0e28265e
5 changed files with 56 additions and 0 deletions
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4
drivers/gpu/drm/drm_atomic_helper.c
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@@ -3500,6 +3500,10 @@ void drm_atomic_helper_plane_reset(struct drm_plane *plane)
if (plane->state) {
plane->state->plane = plane;
plane->state->rotation = DRM_MODE_ROTATE_0;
/* Reset the alpha value to fully opaque if it matters */
if (plane->alpha_property)
plane->state->alpha = plane->alpha_property->values[1];
}
}
EXPORT_SYMBOL(drm_atomic_helper_plane_reset);