Planes with identical zpos value will result undefined behavior:
disappearing planes, screen flickering and it is not supported by the
hardware.
Use normalized zpos to make sure that we don't encounter invalid
configuration.
Signed-off-by: Peter Ujfalusi <peter.ujfal...@ti.com>
CC: Tomi Valkeinen <tomi.valkei...@ti.com>
---
drivers/gpu/drm/omapdrm/omap_drv.c | 1 +
drivers/gpu/drm/omapdrm/omap_plane.c | 2 +-
2 files changed, 2 insertions(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/omapdrm/omap_drv.c
b/drivers/gpu/drm/omapdrm/omap_drv.c
index 2c02b955dd52..25f06f09fbe2 100644
--- a/drivers/gpu/drm/omapdrm/omap_drv.c
+++ b/drivers/gpu/drm/omapdrm/omap_drv.c
@@ -651,6 +651,7 @@ static int pdev_probe(struct platform_device *pdev)
return PTR_ERR(ddev);
ddev->dev_private = priv;
+ ddev->normalize_zpos = true;
platform_set_drvdata(pdev, ddev);
omap_crtc_pre_init();
diff --git a/drivers/gpu/drm/omapdrm/omap_plane.c
b/drivers/gpu/drm/omapdrm/omap_plane.c
index 7d789d1551a1..2c19d2239bc5 100644
--- a/drivers/gpu/drm/omapdrm/omap_plane.c
+++ b/drivers/gpu/drm/omapdrm/omap_plane.c
@@ -65,7 +65,7 @@ static void omap_plane_atomic_update(struct drm_plane *plane,
info.rotation_type = OMAP_DSS_ROT_NONE;
info.rotation = DRM_MODE_ROTATE_0;
info.global_alpha = 0xff;
- info.zorder = state->zpos;
+ info.zorder = state->normalized_zpos;
/* update scanout: */
omap_framebuffer_update_scanout(state->fb, state, &info);
--
Peter
Texas Instruments Finland Oy, Porkkalankatu 22, 00180 Helsinki.
Y-tunnus/Business ID: 0615521-4. Kotipaikka/Domicile: Helsinki
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