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drm/imx: ipuv3-plane: support underlay plane

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The IPUv3 overlay plane may be placed over or under the primary plane.

Set the zpos of the primary to an immutable position of 1 to have the
possibility to place the other plane underneath it.

Set the zpos of other planes (the overlay plane) to a mutable value
between 0 (the lowest possible value of a zpos) and directly above the
primary plane with the latter being the default.

Signed-off-by: Michael Tretter <m.tretter@pengutronix.de>
Reviewed-by: Philipp Zabel <p.zabel@pengutronix.de>
Signed-off-by: Philipp Zabel <p.zabel@pengutronix.de>
Link: https://patch.msgid.link/20260219-drm-imx-underlay-plane-v2-2-26ef829c5483@pengutronix.de
This commit is contained in:
Michael Tretter
2026-02-19 12:32:58 +01:00
committed by Philipp Zabel
parent a872e90e36
commit ecbcceea47
1 changed files with 9 additions and 10 deletions
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19
drivers/gpu/drm/imx/ipuv3/ipuv3-plane.c
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@@ -890,7 +890,7 @@ struct ipu_plane *ipu_plane_init(struct drm_device *dev, struct ipu_soc *ipu,
{
struct ipu_plane *ipu_plane;
const uint64_t *modifiers = ipu_format_modifiers;
unsigned int zpos = (type == DRM_PLANE_TYPE_PRIMARY) ? 0 : 1;
unsigned int primary_zpos = 1;
unsigned int format_count;
const uint32_t *formats;
int ret;
@@ -923,17 +923,16 @@ struct ipu_plane *ipu_plane_init(struct drm_device *dev, struct ipu_soc *ipu,
ipu_plane->dma = dma;
ipu_plane->dp_flow = dp;
if (type == DRM_PLANE_TYPE_PRIMARY)
if (type == DRM_PLANE_TYPE_PRIMARY) {
drm_plane_helper_add(&ipu_plane->base, &ipu_primary_plane_helper_funcs);
else
drm_plane_helper_add(&ipu_plane->base, &ipu_plane_helper_funcs);
if (dp == IPU_DP_FLOW_SYNC_BG || dp == IPU_DP_FLOW_SYNC_FG)
ret = drm_plane_create_zpos_property(&ipu_plane->base, zpos, 0,
1);
else
ret = drm_plane_create_zpos_immutable_property(&ipu_plane->base,
0);
primary_zpos);
} else {
drm_plane_helper_add(&ipu_plane->base, &ipu_plane_helper_funcs);
ret = drm_plane_create_zpos_property(&ipu_plane->base,
primary_zpos + 1, 0,
primary_zpos + 1);
}
if (ret)
return ERR_PTR(ret);