[PATCH v3 13/17] drm/mediatek: add BLENDER support for MT8196

paul-pl.chen
2025-05-15T09:35:21Z

From: Paul-pl Chen <paul-pl.chen@mediatek.com>

BLENDER executes the alpha blending function for overlapping
layers from different sources, which is the primary function
of the overlapping system.

Signed-off-by: Nancy Lin <nancy.lin@mediatek.com>
Signed-off-by: Paul-pl Chen <paul-pl.chen@mediatek.com>
---
drivers/gpu/drm/mediatek/Makefile | 1 +
drivers/gpu/drm/mediatek/mtk_ddp_comp.c | 1 +
drivers/gpu/drm/mediatek/mtk_ddp_comp.h | 1 +
drivers/gpu/drm/mediatek/mtk_disp_blender.c | 264 ++++++++++++++++++++
drivers/gpu/drm/mediatek/mtk_disp_blender.h | 10 +
drivers/gpu/drm/mediatek/mtk_disp_drv.h | 12 +
drivers/gpu/drm/mediatek/mtk_drm_drv.c | 1 +
drivers/gpu/drm/mediatek/mtk_drm_drv.h | 1 +
8 files changed, 291 insertions(+)
create mode 100644 drivers/gpu/drm/mediatek/mtk_disp_blender.c
create mode 100644 drivers/gpu/drm/mediatek/mtk_disp_blender.h

diff --git a/drivers/gpu/drm/mediatek/Makefile b/drivers/gpu/drm/mediatek/Makefile
index db92f4fb353d..a7b9ebe27f68 100644
--- a/drivers/gpu/drm/mediatek/Makefile
+++ b/drivers/gpu/drm/mediatek/Makefile
@@ -3,6 +3,7 @@
mediatek-drm-y := mtk_crtc.o \
mtk_ddp_comp.o \
mtk_disp_aal.o \
+ mtk_disp_blender.o \
mtk_disp_ccorr.o \
mtk_disp_color.o \
mtk_disp_exdma.o \
diff --git a/drivers/gpu/drm/mediatek/mtk_ddp_comp.c b/drivers/gpu/drm/mediatek/mtk_ddp_comp.c
index 3e0739d8e6f1..e65c6df987f2 100644
--- a/drivers/gpu/drm/mediatek/mtk_ddp_comp.c
+++ b/drivers/gpu/drm/mediatek/mtk_ddp_comp.c
@@ -445,6 +445,7 @@ static const char * const mtk_ddp_comp_stem[MTK_DDP_COMP_TYPE_MAX] = {
[MTK_DP_INTF] = "dp-intf",
[MTK_DPI] = "dpi",
[MTK_DSI] = "dsi",
+ [MTK_OVL_BLENDER] = "blender",
[MTK_OVL_EXDMA] = "exdma",
};

diff --git a/drivers/gpu/drm/mediatek/mtk_ddp_comp.h b/drivers/gpu/drm/mediatek/mtk_ddp_comp.h
index 86dc0ee3924c..075ba5683f93 100644
--- a/drivers/gpu/drm/mediatek/mtk_ddp_comp.h
+++ b/drivers/gpu/drm/mediatek/mtk_ddp_comp.h
@@ -43,6 +43,7 @@ enum mtk_ddp_comp_type {
MTK_DPI,
MTK_DP_INTF,
MTK_DSI,
+ MTK_OVL_BLENDER,
MTK_OVL_EXDMA,
MTK_DDP_COMP_TYPE_MAX,
};
diff --git a/drivers/gpu/drm/mediatek/mtk_disp_blender.c b/drivers/gpu/drm/mediatek/mtk_disp_blender.c
new file mode 100644
index 000000000000..7c73bce99592
--- /dev/null
+++ b/drivers/gpu/drm/mediatek/mtk_disp_blender.c
@@ -0,0 +1,264 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (c) 2025 MediaTek Inc.
+ */
+
+#include <drm/drm_fourcc.h>
+#include <drm/drm_blend.h>
+#include <drm/drm_framebuffer.h>
+#include <linux/clk.h>
+#include <linux/component.h>
+#include <linux/of.h>
+#include <linux/of_device.h>
+#include <linux/of_address.h>
+#include <linux/platform_device.h>
+#include <linux/reset.h>
+#include <linux/soc/mediatek/mtk-cmdq.h>
+#include <linux/soc/mediatek/mtk-mmsys.h>
+
+#include "mtk_crtc.h"
+#include "mtk_ddp_comp.h"
+#include "mtk_disp_drv.h"
+#include "mtk_drm_drv.h"
+#include "mtk_disp_blender.h"
+#include "mtk_disp_ovl.h"
+
+#define DISP_REG_OVL_BLD_DATAPATH_CON 0x010
+#define OVL_BLD_BGCLR_IN_SEL BIT(0)
+#define OVL_BLD_BGCLR_OUT_TO_PROC BIT(4)
+#define OVL_BLD_BGCLR_OUT_TO_NEXT_LAYER BIT(5)
+#define DISP_REG_OVL_BLD_EN 0x020
+#define OVL_BLD_EN BIT(0)
+#define OVL_BLD_FORCE_RELAY_MODE BIT(4)
+#define OVL_BLD_RELAY_MODE BIT(5)
+#define DISP_REG_OVL_BLD_RST 0x024
+#define OVL_BLD_RST BIT(0)
+#define DISP_REG_OVL_BLD_SHADOW_CTRL 0x028
+#define OVL_BLD_BYPASS_SHADOW BIT(2)
+#define DISP_REG_OVL_BLD_BGCLR_BALCK 0xff000000
+#define DISP_REG_OVL_BLD_ROI_SIZE 0x030
+#define DISP_REG_OVL_BLD_L_EN 0x040
+#define OVL_BLD_L_EN BIT(0)
+#define DISP_REG_OVL_BLD_OFFSET 0x044
+#define DISP_REG_OVL_BLD_SRC_SIZE 0x048
+#define DISP_REG_OVL_BLD_L0_CLRFMT 0x050
+#define OVL_BLD_CON_FLD_CLRFMT GENMASK(3, 0)
+#define OVL_BLD_CON_CLRFMT_MAN BIT(4)
+#define OVL_BLD_CON_FLD_CLRFMT_NB GENMASK(9, 8)
+#define OVL_BLD_CON_CLRFMT_NB_10_BIT BIT(8)
+#define OVL_BLD_CON_BYTE_SWAP BIT(16)
+#define OVL_BLD_CON_RGB_SWAP BIT(17)
+#define DISP_REG_OVL_BLD_BGCLR_CLR 0x104
+#define DISP_REG_OVL_BLD_L_CON2 0x200
+#define OVL_BLD_L_ALPHA GENMASK(7, 0)
+#define OVL_BLD_L_ALPHA_EN BIT(12)
+#define DISP_REG_OVL_BLD_L0_ALPHA_SEL 0x208
+#define OVL_BLD_L0_CONST BIT(24)
+#define DISP_REG_OVL_BLD_L0_CLR 0x20c
+#define OVL_BLD_CON_CLRFMT_MAN BIT(4)
+
+struct mtk_disp_blender {
+ void __iomem *regs;
+ struct clk *clk;
+ struct cmdq_client_reg cmdq_reg;
+};
+
+void mtk_disp_blender_layer_config(struct device *dev, struct mtk_plane_state *state,
+ struct cmdq_pkt *cmdq_pkt)
+{
+ struct mtk_disp_blender *priv = dev_get_drvdata(dev);
+ struct mtk_plane_pending_state *pending = &state->pending;
+ u32 alpha, clrfmt, ignore_pixel_alpha = 0;
+ u32 blend_mode = mtk_ovl_get_blend_mode(state, MTK_OVL_SUPPORT_BLEND_MODES);
+
+ if (!pending->enable) {
+ mtk_ddp_write(cmdq_pkt, 0, &priv->cmdq_reg, priv->regs, DISP_REG_OVL_BLD_L_EN);
+ return;
+ }
+
+ mtk_ddp_write(cmdq_pkt, pending->y << 16 | pending->x, &priv->cmdq_reg, priv->regs,
+ DISP_REG_OVL_BLD_OFFSET);
+
+ mtk_ddp_write(cmdq_pkt, pending->height << 16 | pending->width, &priv->cmdq_reg,
+ priv->regs, DISP_REG_OVL_BLD_SRC_SIZE);
+
+ clrfmt = mtk_ovl_fmt_convert(pending->format, blend_mode, true, false, 0,
+ OVL_BLD_CON_CLRFMT_MAN, OVL_BLD_CON_BYTE_SWAP,
+ OVL_BLD_CON_RGB_SWAP);
+ clrfmt |= mtk_ovl_is_10bit_rgb(pending->format) ? OVL_BLD_CON_CLRFMT_NB_10_BIT : 0;
+ mtk_ddp_write_mask(cmdq_pkt, clrfmt, &priv->cmdq_reg, priv->regs,
+ DISP_REG_OVL_BLD_L0_CLRFMT, OVL_BLD_CON_CLRFMT_MAN |
+ OVL_BLD_CON_RGB_SWAP | OVL_BLD_CON_BYTE_SWAP |
+ OVL_BLD_CON_FLD_CLRFMT | OVL_BLD_CON_FLD_CLRFMT_NB);
+
+ if (mtk_ovl_is_ignore_pixel_alpha(state, blend_mode))
+ ignore_pixel_alpha = OVL_BLD_L0_CONST;
+ mtk_ddp_write_mask(cmdq_pkt, ignore_pixel_alpha, &priv->cmdq_reg, priv->regs,
+ DISP_REG_OVL_BLD_L0_ALPHA_SEL, OVL_BLD_L0_CONST);
+
+ alpha = (OVL_BLD_L_ALPHA & (state->base.alpha >> 8)) | OVL_BLD_L_ALPHA_EN;
+ mtk_ddp_write_mask(cmdq_pkt, alpha, &priv->cmdq_reg, priv->regs,
+ DISP_REG_OVL_BLD_L_CON2, OVL_BLD_L_ALPHA_EN | OVL_BLD_L_ALPHA);
+
+ mtk_ddp_write(cmdq_pkt, OVL_BLD_L_EN, &priv->cmdq_reg, priv->regs, DISP_REG_OVL_BLD_L_EN);
+}
+
+void mtk_disp_blender_config(struct device *dev, unsigned int w,
+ unsigned int h, unsigned int vrefresh,
+ unsigned int bpc, bool most_top,
+ bool most_bottom, struct cmdq_pkt *cmdq_pkt)
+{
+ struct mtk_disp_blender *priv = dev_get_drvdata(dev);
+ u32 datapath;
+
+ dev_dbg(dev, "%s-w:%d, h:%d\n", __func__, w, h);
+ mtk_ddp_write(cmdq_pkt, h << 16 | w, &priv->cmdq_reg, priv->regs,
+ DISP_REG_OVL_BLD_ROI_SIZE);
+ mtk_ddp_write(cmdq_pkt, DISP_REG_OVL_BLD_BGCLR_BALCK, &priv->cmdq_reg, priv->regs,
+ DISP_REG_OVL_BLD_BGCLR_CLR);
+
+ /*
+ * The input source of blender layer can be EXDMA layer output or
+ * the blender constant layer itself.
+ * This color setting is configured for the blender constant layer.
+ */
+ mtk_ddp_write(cmdq_pkt, DISP_REG_OVL_BLD_BGCLR_BALCK, &priv->cmdq_reg, priv->regs,
+ DISP_REG_OVL_BLD_L0_CLR);
+
+ if (most_top)
+ datapath = OVL_BLD_BGCLR_OUT_TO_PROC;
+ else
+ datapath = OVL_BLD_BGCLR_OUT_TO_NEXT_LAYER;
+ /*
+ * The primary input is from EXDMA and the second input
+ * is optionally from another blender
+ */
+ if (!most_bottom)
+ datapath |= OVL_BLD_BGCLR_IN_SEL;
+
+ mtk_ddp_write_mask(cmdq_pkt, datapath,
+ &priv->cmdq_reg, priv->regs, DISP_REG_OVL_BLD_DATAPATH_CON,
+ OVL_BLD_BGCLR_OUT_TO_PROC | OVL_BLD_BGCLR_OUT_TO_NEXT_LAYER |
+ OVL_BLD_BGCLR_IN_SEL);
+}
+
+void mtk_disp_blender_start(struct device *dev, struct cmdq_pkt *cmdq_pkt)
+{
+ struct mtk_disp_blender *priv = dev_get_drvdata(dev);
+
+ mtk_ddp_write_mask(cmdq_pkt, OVL_BLD_BYPASS_SHADOW, &priv->cmdq_reg, priv->regs,
+ DISP_REG_OVL_BLD_SHADOW_CTRL, OVL_BLD_BYPASS_SHADOW);
+ mtk_ddp_write_mask(cmdq_pkt, OVL_BLD_EN, &priv->cmdq_reg, priv->regs,
+ DISP_REG_OVL_BLD_EN, OVL_BLD_EN);
+}
+
+void mtk_disp_blender_stop(struct device *dev, struct cmdq_pkt *cmdq_pkt)
+{
+ struct mtk_disp_blender *priv = dev_get_drvdata(dev);
+
+ mtk_ddp_write_mask(cmdq_pkt, 0, &priv->cmdq_reg, priv->regs,
+ DISP_REG_OVL_BLD_EN, OVL_BLD_EN);
+
+ mtk_ddp_write_mask(cmdq_pkt, OVL_BLD_RST, &priv->cmdq_reg, priv->regs,
+ DISP_REG_OVL_BLD_RST, OVL_BLD_RST);
+ mtk_ddp_write_mask(cmdq_pkt, 0, &priv->cmdq_reg, priv->regs,
+ DISP_REG_OVL_BLD_RST, OVL_BLD_RST);
+}
+
+int mtk_disp_blender_clk_enable(struct device *dev)
+{
+ struct mtk_disp_blender *priv = dev_get_drvdata(dev);
+
+ return clk_prepare_enable(priv->clk);
+}
+
+void mtk_disp_blender_clk_disable(struct device *dev)
+{
+ struct mtk_disp_blender *priv = dev_get_drvdata(dev);
+
+ clk_disable_unprepare(priv->clk);
+}
+
+u32 mtk_disp_blender_get_blend_modes(struct device *dev)
+{
+ return MTK_OVL_SUPPORT_BLEND_MODES;
+}
+
+static int mtk_disp_blender_bind(struct device *dev, struct device *master,
+ void *data)
+{
+ return 0;
+}
+
+static void mtk_disp_blender_unbind(struct device *dev, struct device *master, void *data)
+{
+}
+
+static const struct component_ops mtk_disp_blender_component_ops = {
+ .bind = mtk_disp_blender_bind,
+ .unbind = mtk_disp_blender_unbind,
+};
+
+static int mtk_disp_blender_probe(struct platform_device *pdev)
+{
+ struct device *dev = &pdev->dev;
+ struct resource *res;
+ struct mtk_disp_blender *priv;
+ int ret = 0;
+
+ priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
+ if (!priv)
+ return -ENOMEM;
+
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ priv->regs = devm_ioremap_resource(dev, res);
+ if (IS_ERR(priv->regs)) {
+ dev_err(dev, "failed to ioremap blender\n");
+ return PTR_ERR(priv->regs);
+ }
+
+ priv->clk = devm_clk_get(dev, NULL);
+ if (IS_ERR(priv->clk)) {
+ dev_err(dev, "failed to get blender clk\n");
+ return PTR_ERR(priv->clk);
+ }
+
+#if IS_REACHABLE(CONFIG_MTK_CMDQ)
+ ret = cmdq_dev_get_client_reg(dev, &priv->cmdq_reg, 0);
+ if (ret)
+ dev_dbg(dev, "No mediatek,gce-client-reg\n");
+#endif
+ platform_set_drvdata(pdev, priv);
+
+ ret = component_add(dev, &mtk_disp_blender_component_ops);
+ if (ret)
+ dev_notice(dev, "Failed to add component: %d\n", ret);
+
+ return ret;
+}
+
+static void mtk_disp_blender_remove(struct platform_device *pdev)
+{
+ component_del(&pdev->dev, &mtk_disp_blender_component_ops);
+}
+
+static const struct of_device_id mtk_disp_blender_driver_dt_match[] = {
+ { .compatible = "mediatek,mt8196-blender"},
+ {},
+};
+
+MODULE_DEVICE_TABLE(of, mtk_disp_blender_driver_dt_match);
+
+struct platform_driver mtk_disp_blender_driver = {
+ .probe = mtk_disp_blender_probe,
+ .remove = mtk_disp_blender_remove,
+ .driver = {
+ .name = "mediatek-disp-blender",
+ .owner = THIS_MODULE,
+ .of_match_table = mtk_disp_blender_driver_dt_match,
+ },
+};
+
+MODULE_AUTHOR("Nancy Lin <nancy.lin@mediatek.com>");
+MODULE_DESCRIPTION("MediaTek Blender Driver");
+MODULE_LICENSE("GPL");
diff --git a/drivers/gpu/drm/mediatek/mtk_disp_blender.h b/drivers/gpu/drm/mediatek/mtk_disp_blender.h
new file mode 100644
index 000000000000..a47ab128649d
--- /dev/null
+++ b/drivers/gpu/drm/mediatek/mtk_disp_blender.h
@@ -0,0 +1,10 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+/*
+ * Copyright (c) 2025 MediaTek Inc.
+ */
+
+#ifndef __MTK_DISP_BLENDER_H__
+#define __MTK_DISP_BLENDER_H__
+
+u32 mtk_disp_blender_get_blend_modes(struct device *dev);
+#endif // __MTK_DISP_BLENDER_H__
diff --git a/drivers/gpu/drm/mediatek/mtk_disp_drv.h b/drivers/gpu/drm/mediatek/mtk_disp_drv.h
index 4e3d2510bef5..39e3af1e2b16 100644
--- a/drivers/gpu/drm/mediatek/mtk_disp_drv.h
+++ b/drivers/gpu/drm/mediatek/mtk_disp_drv.h
@@ -9,6 +9,7 @@
#include <linux/soc/mediatek/mtk-cmdq.h>
#include <linux/soc/mediatek/mtk-mmsys.h>
#include <linux/soc/mediatek/mtk-mutex.h>
+#include "mtk_disp_blender.h"
#include "mtk_mdp_rdma.h"
#include "mtk_plane.h"

@@ -39,6 +40,17 @@ void mtk_color_config(struct device *dev, unsigned int w,
unsigned int bpc, struct cmdq_pkt *cmdq_pkt);
void mtk_color_start(struct device *dev);

+void mtk_disp_blender_start(struct device *dev, struct cmdq_pkt *cmdq_pkt);
+void mtk_disp_blender_stop(struct device *dev, struct cmdq_pkt *cmdq_pkt);
+int mtk_disp_blender_clk_enable(struct device *dev);
+void mtk_disp_blender_clk_disable(struct device *dev);
+void mtk_disp_blender_config(struct device *dev, unsigned int w,
+ unsigned int h, unsigned int vrefresh,
+ unsigned int bpc, bool most_top, bool most_bottom,
+ struct cmdq_pkt *cmdq_pkt);
+void mtk_disp_blender_layer_config(struct device *dev, struct mtk_plane_state *state,
+ struct cmdq_pkt *cmdq_pkt);
+
int mtk_disp_exdma_clk_enable(struct device *dev);
void mtk_disp_exdma_clk_disable(struct device *dev);
void mtk_disp_exdma_start(struct device *dev, struct cmdq_pkt *cmdq_pkt);
diff --git a/drivers/gpu/drm/mediatek/mtk_drm_drv.c b/drivers/gpu/drm/mediatek/mtk_drm_drv.c
index bb7306a942ff..7a14f45d5f97 100644
--- a/drivers/gpu/drm/mediatek/mtk_drm_drv.c
+++ b/drivers/gpu/drm/mediatek/mtk_drm_drv.c
@@ -1274,6 +1274,7 @@ static struct platform_driver mtk_drm_platform_driver = {

static struct platform_driver * const mtk_drm_drivers[] = {
&mtk_disp_aal_driver,
+ &mtk_disp_blender_driver,
&mtk_disp_ccorr_driver,
&mtk_disp_color_driver,
&mtk_disp_exdma_driver,
diff --git a/drivers/gpu/drm/mediatek/mtk_drm_drv.h b/drivers/gpu/drm/mediatek/mtk_drm_drv.h
index 898a75898775..89178de1478f 100644
--- a/drivers/gpu/drm/mediatek/mtk_drm_drv.h
+++ b/drivers/gpu/drm/mediatek/mtk_drm_drv.h
@@ -70,6 +70,7 @@ struct mtk_drm_private {
};

extern struct platform_driver mtk_disp_aal_driver;
+extern struct platform_driver mtk_disp_blender_driver;
extern struct platform_driver mtk_disp_ccorr_driver;
extern struct platform_driver mtk_disp_color_driver;
extern struct platform_driver mtk_disp_exdma_driver;
--
2.45.2