drm/meson: Support Overlay plane for video rendering

The Amlogic Meson GX SoCs support an Overlay plane behind the primary
plane for video rendering.

This Overlay plane support various YUV layouts :
- YUYV
- NV12 / NV21
- YUV444 / 422 / 420 / 411 / 410

The scaler supports a wide range of scaling ratios, but for simplicity,
plane atomic check limits the scaling from x5 to /5 in vertical and
horizontal scaling.

The z-order is fixed and always behind the primary plane and cannot be changed.

The scaling parameter algorithm was taken from the Amlogic vendor kernel
code and rewritten to match the atomic universal plane requirements.

The video rendering using this overlay plane support has been tested using
the new Kodi DRM-KMS Prime rendering path along the in-review V4L2 Mem2Mem
Hardware Video Decoder up to 3840x2160 NV12 frames on various display modes.

Signed-off-by: Neil Armstrong <narmstrong@baylibre.com>
Acked-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Tested-by: Maxime Jourdan <mjourdan@baylibre.com>
Link: https://patchwork.freedesktop.org/patch/msgid/1541497202-20570-2-git-send-email-narmstrong@baylibre.com

1 files changed, 28 insertions, 1 deletions

diff --git a/drivers/gpu/drm/meson/meson_drv.c b/drivers/gpu/drm/meson/meson_drv.c
index 3fe6edf79b5c..3ee4d4a4ecba 100644
--- a/drivers/gpu/drm/meson/meson_drv.c
+++ b/drivers/gpu/drm/meson/meson_drv.c
@@ -41,6 +41,7 @@
 
 #include "meson_drv.h"
 #include "meson_plane.h"
+#include "meson_overlay.h"
 #include "meson_crtc.h"
 #include "meson_venc_cvbs.h"
 
@@ -213,6 +214,24 @@ static int meson_drv_bind_master(struct device *dev, bool has_components)
 		ret = meson_canvas_alloc(priv->canvas, &priv->canvas_id_osd1);
 		if (ret)
 			goto free_drm;
+		ret = meson_canvas_alloc(priv->canvas, &priv->canvas_id_vd1_0);
+		if (ret) {
+			meson_canvas_free(priv->canvas, priv->canvas_id_osd1);
+			goto free_drm;
+		}
+		ret = meson_canvas_alloc(priv->canvas, &priv->canvas_id_vd1_1);
+		if (ret) {
+			meson_canvas_free(priv->canvas, priv->canvas_id_osd1);
+			meson_canvas_free(priv->canvas, priv->canvas_id_vd1_0);
+			goto free_drm;
+		}
+		ret = meson_canvas_alloc(priv->canvas, &priv->canvas_id_vd1_2);
+		if (ret) {
+			meson_canvas_free(priv->canvas, priv->canvas_id_osd1);
+			meson_canvas_free(priv->canvas, priv->canvas_id_vd1_0);
+			meson_canvas_free(priv->canvas, priv->canvas_id_vd1_1);
+			goto free_drm;
+		}
 	} else {
 		priv->canvas = NULL;
 
@@ -273,6 +292,10 @@ static int meson_drv_bind_master(struct device *dev, bool has_components)
 	if (ret)
 		goto free_drm;
 
+	ret = meson_overlay_create(priv);
+	if (ret)
+		goto free_drm;
+
 	ret = meson_crtc_create(priv);
 	if (ret)
 		goto free_drm;
@@ -311,8 +334,12 @@ static void meson_drv_unbind(struct device *dev)
 	struct drm_device *drm = dev_get_drvdata(dev);
 	struct meson_drm *priv = drm->dev_private;
 
-	if (priv->canvas)
+	if (priv->canvas) {
 		meson_canvas_free(priv->canvas, priv->canvas_id_osd1);
+		meson_canvas_free(priv->canvas, priv->canvas_id_vd1_0);
+		meson_canvas_free(priv->canvas, priv->canvas_id_vd1_1);
+		meson_canvas_free(priv->canvas, priv->canvas_id_vd1_2);
+	}
 
 	drm_dev_unregister(drm);
 	drm_kms_helper_poll_fini(drm);