[PATCH 27/42] drm/mediatek: Add support for Display Layer Blender component
AngeloGioacchino Del Regno
angelogioacchino.delregno at collabora.com
Wed Jul 1 05:20:42 PDT 2026
Add support for the Layer Blender hardware component, found in the
MediaTek Kompanio Ultra MT8196, Genio Pro 5100 MT8894, Dimensity
9400 MT6991 and others.
This component is responsible for managing blending of single
layer stages and therefore implements one full layer stage which
gets completed by an exDMA hardware component.
Signed-off-by: AngeloGioacchino Del Regno <angelogioacchino.delregno at collabora.com>
---
drivers/gpu/drm/mediatek/Makefile | 1 +
drivers/gpu/drm/mediatek/mtk_ddp_comp.c | 14 +
drivers/gpu/drm/mediatek/mtk_disp_blender.c | 318 ++++++++++++++++++++
drivers/gpu/drm/mediatek/mtk_disp_drv.h | 15 +
drivers/gpu/drm/mediatek/mtk_drm_drv.c | 3 +
drivers/gpu/drm/mediatek/mtk_drm_drv.h | 1 +
include/linux/soc/mediatek/mtk-mmsys.h | 1 +
7 files changed, 353 insertions(+)
create mode 100644 drivers/gpu/drm/mediatek/mtk_disp_blender.c
diff --git a/drivers/gpu/drm/mediatek/Makefile b/drivers/gpu/drm/mediatek/Makefile
index c48ac3ab08cc..a3c1285e8f33 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_dsc.o \
diff --git a/drivers/gpu/drm/mediatek/mtk_ddp_comp.c b/drivers/gpu/drm/mediatek/mtk_ddp_comp.c
index 8b9228084828..6a312f3ddb09 100644
--- a/drivers/gpu/drm/mediatek/mtk_ddp_comp.c
+++ b/drivers/gpu/drm/mediatek/mtk_ddp_comp.c
@@ -246,6 +246,18 @@ static const struct mtk_ddp_comp_funcs ddp_aal = {
.stop = mtk_aal_stop,
};
+static const struct mtk_ddp_comp_funcs ddp_blender = {
+ .clk_enable = mtk_blender_clk_enable,
+ .clk_disable = mtk_blender_clk_disable,
+ .config = mtk_blender_config,
+ .start = mtk_blender_start,
+ .stop = mtk_blender_stop,
+ .layer_config = mtk_blender_layer_config,
+ .get_blend_modes = mtk_blender_get_blend_modes,
+ .layerstage_nr = mtk_blender_layerstage_nr,
+ .connect = mtk_blender_connect,
+};
+
static const struct mtk_ddp_comp_funcs ddp_ccorr = {
.clk_enable = mtk_ccorr_clk_enable,
.clk_disable = mtk_ccorr_clk_disable,
@@ -416,6 +428,7 @@ static const struct mtk_ddp_comp_funcs ddp_ovl_adaptor = {
static const char * const mtk_ddp_comp_stem[MTK_DDP_COMP_TYPE_MAX] = {
[MTK_DISP_AAL] = "aal",
+ [MTK_DISP_BLENDER] = "blender",
[MTK_DISP_BLS] = "bls",
[MTK_DISP_CCORR] = "ccorr",
[MTK_DISP_COLOR] = "color",
@@ -441,6 +454,7 @@ static const char * const mtk_ddp_comp_stem[MTK_DDP_COMP_TYPE_MAX] = {
static const struct mtk_ddp_comp_funcs *mtk_ddp_funcs[MTK_DDP_COMP_TYPE_MAX] = {
[MTK_DISP_AAL] = &ddp_aal,
+ [MTK_DISP_BLENDER] = &ddp_blender,
[MTK_DISP_BLS] = NULL,
[MTK_DISP_CCORR] = &ddp_ccorr,
[MTK_DISP_COLOR] = &ddp_color,
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..74679b15a26c
--- /dev/null
+++ b/drivers/gpu/drm/mediatek/mtk_disp_blender.c
@@ -0,0 +1,318 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (c) 2025 MediaTek Inc.
+ * Copyright (c) 2026 Collabora Ltd.
+ * AngeloGioacchino Del Regno <angelogioacchino.delregno at collabora.com>
+ */
+
+#include <drm/drm_blend.h>
+#include <drm/drm_fourcc.h>
+#include <drm/drm_framebuffer.h>
+#include <linux/clk.h>
+#include <linux/component.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/of_address.h>
+#include <linux/of_device.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_disp_ovl.h"
+#include "mtk_drm_drv.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_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_BGCLR_BLACK 0xff000000
+# define OVL_BLD_BGCLR_RED 0xffff0000
+
+#define BLENDER_MAX_SIZE 8191
+
+struct mtk_disp_blender {
+ void __iomem *regs;
+ struct clk *clk;
+ struct cmdq_client_reg cmdq_reg;
+};
+
+static void mtk_blender_unset_input_bgclr(struct mtk_disp_blender *priv)
+{
+ u32 val;
+
+ val = readl(priv->regs + DISP_REG_OVL_BLD_DATAPATH_CON);
+ val &= ~OVL_BLD_BGCLR_IN_SEL;
+ writel(val, priv->regs + DISP_REG_OVL_BLD_DATAPATH_CON);
+}
+
+void mtk_blender_layer_config(struct device *dev, unsigned int idx,
+ 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, blend_mode, clrfmt, ignore_pixel_alpha;
+
+ /*
+ * Deselect IN from OVL Background Color if this is the first Blender
+ * to implicitly select input from exDMA instead.
+ */
+ if (idx == 0)
+ mtk_blender_unset_input_bgclr(priv);
+
+ if (!pending->enable || pending->height == 0 || pending->width == 0 ||
+ pending->x > BLENDER_MAX_SIZE || pending->y > BLENDER_MAX_SIZE) {
+ mtk_ddp_write(cmdq_pkt, 0, &priv->cmdq_reg, priv->regs, DISP_REG_OVL_BLD_L_EN);
+ return;
+ }
+
+ mtk_ddp_write(cmdq_pkt,
+ ((pending->height & GENMASK(15, 0)) << 16) |
+ (pending->width & GENMASK(15, 0)),
+ &priv->cmdq_reg, priv->regs, DISP_REG_OVL_BLD_SRC_SIZE);
+ mtk_ddp_write(cmdq_pkt,
+ ((pending->y & GENMASK(15, 0)) << 16) | (pending->x & GENMASK(15, 0)),
+ &priv->cmdq_reg, priv->regs, DISP_REG_OVL_BLD_OFFSET);
+
+ blend_mode = mtk_ovl_get_blend_mode(state, MTK_OVL_SUPPORT_BLEND_MODES);
+ 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;
+ else
+ ignore_pixel_alpha = 0;
+
+ 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 = FIELD_PREP(OVL_BLD_L_ALPHA, (state->base.alpha >> 8));
+ alpha |= 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);
+}
+
+unsigned int mtk_blender_layerstage_nr(struct device *dev)
+{
+ return 1;
+}
+
+void mtk_blender_start(struct device *dev)
+{
+ struct mtk_disp_blender *priv = dev_get_drvdata(dev);
+ u32 val;
+
+ /* Bypass shadow registers and enable */
+ val = readl(priv->regs + DISP_REG_OVL_BLD_SHADOW_CTRL);
+ val |= OVL_BLD_BYPASS_SHADOW;
+ writel(val, priv->regs + DISP_REG_OVL_BLD_SHADOW_CTRL);
+
+ val = readl(priv->regs + DISP_REG_OVL_BLD_EN);
+ val |= OVL_BLD_EN;
+ writel(val, priv->regs + DISP_REG_OVL_BLD_EN);
+}
+
+void mtk_blender_stop(struct device *dev)
+{
+ struct mtk_disp_blender *priv = dev_get_drvdata(dev);
+ u32 val;
+
+ /* Disable and reset */
+ val = readl(priv->regs + DISP_REG_OVL_BLD_EN);
+ val = val & ~OVL_BLD_EN;
+ writel(val, priv->regs + DISP_REG_OVL_BLD_EN);
+
+ val = readl(priv->regs + DISP_REG_OVL_BLD_RST);
+ val |= OVL_BLD_RST;
+ writel(val, priv->regs + DISP_REG_OVL_BLD_RST);
+
+ val = readl(priv->regs + DISP_REG_OVL_BLD_RST);
+ val = val & ~OVL_BLD_RST;
+ writel(val, priv->regs + DISP_REG_OVL_BLD_RST);
+}
+
+void mtk_blender_config(struct mtk_ddp_comp *comp, unsigned int w,
+ unsigned int h, unsigned int vrefresh,
+ unsigned int bpc, struct cmdq_pkt *cmdq_pkt)
+{
+ struct mtk_disp_blender *priv = dev_get_drvdata(comp->dev);
+ u32 val;
+
+ /* Set ROI for this Blender */
+ val = ((h & GENMASK(15, 0)) << 16) | (w & GENMASK(15, 0));
+ writel(val, priv->regs + DISP_REG_OVL_BLD_ROI_SIZE);
+
+ /*
+ * Set both background color and constant layer color to Opaque Black
+ * (ARGB) for eventual Alpha Blending to be effective
+ */
+ writel(OVL_BLD_BGCLR_BLACK, priv->regs + DISP_REG_OVL_BLD_BGCLR_CLR);
+ writel(OVL_BLD_BGCLR_BLACK, priv->regs + DISP_REG_OVL_BLD_L0_CLR);
+}
+
+void mtk_blender_connect(struct mtk_ddp_comp *comp, struct device *mmsys_dev,
+ struct mtk_ddp_comp *next)
+{
+ struct mtk_disp_blender *priv = dev_get_drvdata(comp->dev);
+ const u32 mask = OVL_BLD_BGCLR_OUT_TO_PROC |
+ OVL_BLD_BGCLR_OUT_TO_NEXT_LAYER |
+ OVL_BLD_BGCLR_IN_SEL;
+ u32 data_path = OVL_BLD_BGCLR_IN_SEL;
+ u32 val;
+
+ /* Usually the next component is either another OUTPROC or an exDMA */
+ if (next->type == MTK_DISP_OUTPROC)
+ data_path |= OVL_BLD_BGCLR_OUT_TO_PROC;
+ else
+ data_path |= OVL_BLD_BGCLR_OUT_TO_NEXT_LAYER;
+
+ val = readl(priv->regs + DISP_REG_OVL_BLD_DATAPATH_CON);
+ val = (val & ~mask) | data_path;
+ writel(val, priv->regs + DISP_REG_OVL_BLD_DATAPATH_CON);
+
+ mtk_mmsys_hw_connect(mmsys_dev,
+ comp->type, comp->inst_id, next->type, next->inst_id);
+}
+
+int mtk_blender_clk_enable(struct mtk_ddp_comp *comp)
+{
+ struct mtk_disp_blender *priv = dev_get_drvdata(comp->dev);
+
+ return clk_prepare_enable(priv->clk);
+}
+
+void mtk_blender_clk_disable(struct mtk_ddp_comp *comp)
+{
+ struct mtk_disp_blender *priv = dev_get_drvdata(comp->dev);
+
+ clk_disable_unprepare(priv->clk);
+}
+
+u32 mtk_blender_get_blend_modes(struct device *dev)
+{
+ return MTK_OVL_SUPPORT_BLEND_MODES;
+}
+
+static int mtk_blender_bind(struct device *dev, struct device *master,
+ void *data)
+{
+ return 0;
+}
+
+static void mtk_blender_unbind(struct device *dev, struct device *master, void *data)
+{
+}
+
+static const struct component_ops mtk_disp_blender_component_ops = {
+ .bind = mtk_blender_bind,
+ .unbind = mtk_blender_unbind,
+};
+
+static int mtk_blender_probe(struct platform_device *pdev)
+{
+ struct device *dev = &pdev->dev;
+ struct mtk_disp_blender *priv;
+ int ret = 0;
+
+ priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
+ if (!priv)
+ return -ENOMEM;
+
+ priv->regs = devm_platform_ioremap_resource(pdev, 0);
+ if (IS_ERR(priv->regs))
+ return dev_err_probe(dev, PTR_ERR(priv->regs), "Cannot get reg\n");
+
+ priv->clk = devm_clk_get(dev, NULL);
+ if (IS_ERR(priv->clk))
+ return dev_err_probe(dev, PTR_ERR(priv->clk), "Cannot get clocks\n");
+
+#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 = devm_pm_runtime_enable(dev);
+ if (ret)
+ return ret;
+
+ ret = component_add(dev, &mtk_disp_blender_component_ops);
+ if (ret)
+ return dev_err_probe(dev, ret, "Failed to add component\n");
+
+ return 0;
+}
+
+static void mtk_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-disp-blender" },
+ { /* sentinel */ },
+};
+MODULE_DEVICE_TABLE(of, mtk_disp_blender_driver_dt_match);
+
+struct platform_driver mtk_disp_blender_driver = {
+ .probe = mtk_blender_probe,
+ .remove = mtk_blender_remove,
+ .driver = {
+ .name = "mediatek-disp-blender",
+ .owner = THIS_MODULE,
+ .of_match_table = mtk_disp_blender_driver_dt_match,
+ },
+};
+
+MODULE_AUTHOR("AngeloGioacchino Del Regno <angelogioacchino.delregno at collabora.com>");
+MODULE_AUTHOR("Nancy Lin <nancy.lin at mediatek.com>");
+MODULE_DESCRIPTION("MediaTek Display Controller Layer Blender Driver");
+MODULE_LICENSE("GPL");
diff --git a/drivers/gpu/drm/mediatek/mtk_disp_drv.h b/drivers/gpu/drm/mediatek/mtk_disp_drv.h
index 62daf5ade9d1..e834bf17d86c 100644
--- a/drivers/gpu/drm/mediatek/mtk_disp_drv.h
+++ b/drivers/gpu/drm/mediatek/mtk_disp_drv.h
@@ -27,6 +27,21 @@ void mtk_aal_gamma_set(struct device *dev, struct drm_crtc_state *state);
void mtk_aal_start(struct device *dev);
void mtk_aal_stop(struct device *dev);
+int mtk_blender_clk_enable(struct mtk_ddp_comp *comp);
+void mtk_blender_clk_disable(struct mtk_ddp_comp *comp);
+void mtk_blender_connect(struct mtk_ddp_comp *comp, struct device *mmsys_dev,
+ struct mtk_ddp_comp *next);
+void mtk_blender_config(struct mtk_ddp_comp *comp, unsigned int w,
+ unsigned int h, unsigned int vrefresh,
+ unsigned int bpc, struct cmdq_pkt *cmdq_pkt);
+u32 mtk_blender_get_blend_modes(struct device *dev);
+void mtk_blender_layer_config(struct device *dev, unsigned int idx,
+ struct mtk_plane_state *state,
+ struct cmdq_pkt *cmdq_pkt);
+unsigned int mtk_blender_layerstage_nr(struct device *dev);
+void mtk_blender_start(struct device *dev);
+void mtk_blender_stop(struct device *dev);
+
void mtk_ccorr_ctm_set(struct device *dev, struct drm_crtc_state *state);
int mtk_ccorr_clk_enable(struct mtk_ddp_comp *comp);
void mtk_ccorr_clk_disable(struct mtk_ddp_comp *comp);
diff --git a/drivers/gpu/drm/mediatek/mtk_drm_drv.c b/drivers/gpu/drm/mediatek/mtk_drm_drv.c
index ee835ebbc18c..a70392c54bb9 100644
--- a/drivers/gpu/drm/mediatek/mtk_drm_drv.c
+++ b/drivers/gpu/drm/mediatek/mtk_drm_drv.c
@@ -503,6 +503,8 @@ static const struct of_device_id mtk_ddp_comp_dt_ids[] = {
.data = (void *)MTK_DISP_AAL},
{ .compatible = "mediatek,mt8192-disp-aal",
.data = (void *)MTK_DISP_AAL},
+ { .compatible = "mediatek,mt8196-disp-blender",
+ .data = (void *)MTK_DISP_BLENDER },
{ .compatible = "mediatek,mt8167-disp-ccorr",
.data = (void *)MTK_DISP_CCORR },
{ .compatible = "mediatek,mt8183-disp-ccorr",
@@ -1059,6 +1061,7 @@ 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_dsc_driver,
diff --git a/drivers/gpu/drm/mediatek/mtk_drm_drv.h b/drivers/gpu/drm/mediatek/mtk_drm_drv.h
index 4028268b3cc8..f36888fd7244 100644
--- a/drivers/gpu/drm/mediatek/mtk_drm_drv.h
+++ b/drivers/gpu/drm/mediatek/mtk_drm_drv.h
@@ -73,6 +73,7 @@ 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_dsc_driver;
diff --git a/include/linux/soc/mediatek/mtk-mmsys.h b/include/linux/soc/mediatek/mtk-mmsys.h
index 0b3bef392ab8..b32f0c92f040 100644
--- a/include/linux/soc/mediatek/mtk-mmsys.h
+++ b/include/linux/soc/mediatek/mtk-mmsys.h
@@ -88,6 +88,7 @@ enum mtk_ddp_comp_type {
/* DISP Components */
MTK_DISP_AAL,
MTK_DISP_BLS,
+ MTK_DISP_BLENDER,
MTK_DISP_CCORR,
MTK_DISP_COLOR,
MTK_DISP_DITHER,
--
2.54.0
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