[PATCH] drm/fsl-dcu: Add multi layers support

[Jianwei Wang]

For DCU support atmost 16 layers(on ls1021a) or 64 layers(on vf610),
add (total_layer - 1) overlay planes.

Signed-off-by: Jianwei Wang <jianwei.wang.chn at gmail.com>
---
 drivers/gpu/drm/fsl-dcu/fsl_dcu_drm_plane.c | 27 ++++++++++++++++++++++++++-
 1 file changed, 26 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/fsl-dcu/fsl_dcu_drm_plane.c 
b/drivers/gpu/drm/fsl-dcu/fsl_dcu_drm_plane.c
index 8787920..1195568 100644
--- a/drivers/gpu/drm/fsl-dcu/fsl_dcu_drm_plane.c
+++ b/drivers/gpu/drm/fsl-dcu/fsl_dcu_drm_plane.c
@@ -236,7 +236,10 @@ static const u32 fsl_dcu_drm_plane_formats[] = {

 struct drm_plane *fsl_dcu_drm_primary_create_plane(struct drm_device *dev)
 {
+       struct fsl_dcu_drm_device *fsl_dev = dev->dev_private;
        struct drm_plane *primary;
+       struct drm_plane *overlay;
+       unsigned int total_layer, formats_size, i;
        int ret;

        primary = kzalloc(sizeof(*primary), GFP_KERNEL);
@@ -245,11 +248,12 @@ struct drm_plane *fsl_dcu_drm_primary_create_plane(struct 
drm_device *dev)
                return NULL;
        }

+       formats_size = ARRAY_SIZE(fsl_dcu_drm_plane_formats);
        /* possible_crtc's will be filled in later by crtc_init */
        ret = drm_universal_plane_init(dev, primary, 0,
                                       &fsl_dcu_drm_plane_funcs,
                                       fsl_dcu_drm_plane_formats,
-                                      ARRAY_SIZE(fsl_dcu_drm_plane_formats),
+                                      formats_size,
                                       DRM_PLANE_TYPE_PRIMARY);
        if (ret) {
                kfree(primary);
@@ -257,5 +261,26 @@ struct drm_plane *fsl_dcu_drm_primary_create_plane(struct 
drm_device *dev)
        }
        drm_plane_helper_add(primary, &fsl_dcu_drm_plane_helper_funcs);

+       total_layer = fsl_dev->soc->total_layer;
+       for (i = 0; i < total_layer - 1; i++) {
+               overlay = kzalloc(sizeof(*overlay), GFP_KERNEL);
+               if (!overlay) {
+                       DRM_DEBUG_KMS("Failed to allocate overlay plane\n");
+                       goto out;
+               }
+
+               ret = drm_universal_plane_init(dev, overlay, 1,
+                                              &fsl_dcu_drm_plane_funcs,
+                                              fsl_dcu_drm_plane_formats,
+                                              formats_size,
+                                              DRM_PLANE_TYPE_OVERLAY);
+               if (ret) {
+                       kfree(overlay);
+                       goto out;
+               }
+               drm_plane_helper_add(overlay, &fsl_dcu_drm_plane_helper_funcs);
+       }
+
+out:
        return primary;
 }
-- 
2.1.0.27.g96db324