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drm/stm: ltdc: attach immutable zpos property to planes 

Defines plane ordering by hard-coding an immutable Z position from the
first plane, used as primary layer, to the next ones as overlay in order
of instantiation.

This zpos is only an information as it is not possible to modify it,
blending operations are still applied from the top to the bottom layer.

This patch helps to remove a warning message from the Android
Hardware Composer.

Signed-off-by: Raphael Gallais-Pou <raphael.gallais-pou@foss.st.com>
Acked-by: Yannick Fertre <yannick.fertre@foss.st.com>
Reviewed-by: Yannick Fertre <yannick.fertre@foss.st.com>
Signed-off-by: Philippe Cornu <philippe.cornu@foss.st.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20210907151323.5850-1-raphael.gallais-pou@foss.st.com
This commit is contained in:
Raphael Gallais-Pou 2021-09-07 17:13:23 +02:00 committed by Philippe Cornu
parent 361da7c342
commit ee2cda7b02
1 changed files with 3 additions and 0 deletions
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3
drivers/gpu/drm/stm/ltdc.c
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@ -1024,6 +1024,8 @@ static int ltdc_crtc_init(struct drm_device *ddev, struct drm_crtc *crtc)
return -EINVAL;
}
drm_plane_create_zpos_immutable_property(primary, 0);
ret = drm_crtc_init_with_planes(ddev, crtc, primary, NULL,
&ltdc_crtc_funcs, NULL);
if (ret) {
@ -1046,6 +1048,7 @@ static int ltdc_crtc_init(struct drm_device *ddev, struct drm_crtc *crtc)
DRM_ERROR("Can not create overlay plane %d\n", i);
goto cleanup;
}
drm_plane_create_zpos_immutable_property(overlay, i);
}
return 0;