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drm: rcar-du: Add DRM_MODE_BLEND_PREMULTI support

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R-Car DU driver implicitly supports DRM_MODE_BLEND_COVERAGE only.
This adds a support for DRM_MODE_BLEND_PREMULTI. As a consequence,
DRM_MODE_BLEND_PREMULTI becomes the default. If DRM_MODE_BLEND_COVERAGE
is desired, it should be set explicitly.

This behavior comes from how DRM blend mode is supported.
drm_plane_create_blend_mode_property() creates the blend mode property
with the default value of DRM_MODE_BLEND_PREMULTI. This default value
cannot be modified from the atomic driver.

Signed-off-by: Takanari Hayama <taki@igel.co.jp>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
This commit is contained in:
Takanari Hayama 2022-08-10 17:37:10 +09:00 committed by Laurent Pinchart
parent 0efb6fd366
commit b07f5a4d44
1 changed files with 6 additions and 0 deletions
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6
drivers/gpu/drm/rcar-du/rcar_du_vsp.c
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@ -171,6 +171,8 @@ static void rcar_du_vsp_plane_setup(struct rcar_du_vsp_plane *plane)
format = rcar_du_format_info(state->format->fourcc);
cfg.pixelformat = format->v4l2;
cfg.premult = state->state.pixel_blend_mode == DRM_MODE_BLEND_PREMULTI;
vsp1_du_atomic_update(plane->vsp->vsp, crtc->vsp_pipe,
plane->index, &cfg);
}
@ -436,6 +438,10 @@ int rcar_du_vsp_init(struct rcar_du_vsp *vsp, struct device_node *np,
drm_plane_create_zpos_property(&plane->plane, i, 0,
num_planes - 1);
drm_plane_create_blend_mode_property(&plane->plane,
BIT(DRM_MODE_BLEND_PREMULTI) |
BIT(DRM_MODE_BLEND_COVERAGE));
vsp->num_planes++;
}