The ETHDR is one of the components of the video pipeline on some MediaTek SoCs, such as the MT8188. Only its mixer sub-block is used, which is the block's first register window.
Signed-off-by: Julien Stephan <[email protected]> --- drivers/video/mediatek/mtk_ethdr.c | 72 ++++++++++++++++++++++++++++++++++++++ drivers/video/mediatek/mtk_ethdr.h | 16 +++++++++ 2 files changed, 88 insertions(+) diff --git a/drivers/video/mediatek/mtk_ethdr.c b/drivers/video/mediatek/mtk_ethdr.c new file mode 100644 index 00000000000..7584fd565f5 --- /dev/null +++ b/drivers/video/mediatek/mtk_ethdr.c @@ -0,0 +1,72 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Mediatek Video ETHDR support + * + * Copyright (c) 2026 BayLibre, SAS. + * Author: Julien Stephan <[email protected]> + */ + +#include <dm.h> + +#include "mtk_disp_comp.h" +#include "mtk_ethdr.h" + +#define MIX_EN 0xc +#define MIX_ROI_SIZE 0x18 +#define MIX_DATAPATH_CON 0x1c +#define OUTPUT_NO_RND BIT(3) +#define SOURCE_RGB_SEL BIT(7) +#define BACKGROUND_RELAY (4 << 9) +#define MIX_ROI_BGCLR 0x20 +#define BGCLR_BLACK 0xff000000 +#define MIX_SRC_CON 0x24 +#define MIX_L_SRC_CON(n) (0x28 + 0x18 * (n)) +#define NON_PREMULTI_SOURCE (2 << 12) +#define MIX_L_SRC_SIZE(n) (0x30 + 0x18 * (n)) +#define MIX_FUNC_DCM0 0x120 +#define MIX_FUNC_DCM1 0x124 +#define MIX_FUNC_DCM_ENABLE 0xffffffff + +/* Fields used by this driver but not present in the upstream driver */ +#define MIX_SRC_L2_EN BIT(2) +#define L2_SRC_SEL (2 << 20) +#define L2_OUT_SEL (2 << 22) + +void mtk_ethdr_config(struct udevice *dev, u16 width, u16 height) +{ + /* enable internal clocks */ + mtk_disp_comp_write(dev, MIX_FUNC_DCM0, MIX_FUNC_DCM_ENABLE); + mtk_disp_comp_write(dev, MIX_FUNC_DCM1, MIX_FUNC_DCM_ENABLE); + + /* enable mixer */ + mtk_disp_comp_write(dev, MIX_EN, 0x1); + + mtk_disp_comp_write(dev, MIX_ROI_SIZE, (height << 16) | width); + mtk_disp_comp_write(dev, MIX_DATAPATH_CON, + OUTPUT_NO_RND | SOURCE_RGB_SEL | BACKGROUND_RELAY); + mtk_disp_comp_write(dev, MIX_L_SRC_SIZE(2), (height << 16) | width); + mtk_disp_comp_write(dev, MIX_ROI_BGCLR, BGCLR_BLACK); + + /* only configure L2 since only rdma4 and rdma5 are used */ + mtk_disp_comp_write(dev, MIX_L_SRC_CON(2), NON_PREMULTI_SOURCE); + mtk_disp_comp_write(dev, MIX_SRC_CON, + MIX_SRC_L2_EN | L2_SRC_SEL | L2_OUT_SEL); +} + +static const struct udevice_id mtk_ethdr_ids[] = { + { .compatible = "mediatek,mt8195-disp-ethdr" }, + { } +}; + +/* + * The mixer is the first register window ("mixer" in reg-names) of the + * ethdr block, so binding the ethdr node with default register index 0 + * gives the mixer registers. + */ +U_BOOT_DRIVER(mtk_ethdr) = { + .name = "mtk_ethdr", + .id = UCLASS_MISC, + .of_match = mtk_ethdr_ids, + .probe = mtk_disp_comp_probe, + .priv_auto = sizeof(struct mtk_disp_comp_priv), +}; diff --git a/drivers/video/mediatek/mtk_ethdr.h b/drivers/video/mediatek/mtk_ethdr.h new file mode 100644 index 00000000000..5242b362268 --- /dev/null +++ b/drivers/video/mediatek/mtk_ethdr.h @@ -0,0 +1,16 @@ +/* SPDX-License-Identifier: GPL-2.0-only */ +/* + * Mediatek Video ETHDR support + * + * Copyright (c) 2026 BayLibre, SAS. + * Author: Julien Stephan <[email protected]> + */ + +#ifndef _MTK_ETHDR_H +#define _MTK_ETHDR_H + +struct udevice; + +void mtk_ethdr_config(struct udevice *dev, u16 width, u16 height); + +#endif -- 2.55.0
