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f9a234819 drm/meson: Support Overlay plane for video rendering ... Browse Code »

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
Acked-by: Daniel Vetter
Tested-by: Maxime Jourdan
Link: https://patchwork.freedesktop.org/patch/msgid/1541497202-20570-2-git-send-email-narmstrong@baylibre.com

Neil Armstrong
2018-11-13 20:27:51 +0800

meson_overlay.h 295 Bytes

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/* SPDX-License-Identifier: GPL-2.0+ */
/*
 * Copyright (C) 2018 BayLibre, SAS
 * Author: Neil Armstrong <narmstrong@baylibre.com>
 */

#ifndef __MESON_OVERLAY_H
#define __MESON_OVERLAY_H

#include "meson_drv.h"

int meson_overlay_create(struct meson_drm *priv);

#endif /* __MESON_OVERLAY_H */