Re: [PATCH v3 13/15] drm/mediatek: add ovl_adaptor support for MT8195 | linux-mediatek

quoted hunk

Hi, Nancy:

Nancy.Lin [off-list ref] 於 2021年8月18日 週三 下午5:19寫道：
Add ovl_adaptor driver for MT8195.
Ovl_adaptor is an encapsulated module and designed for simplified
DRM control flow. This module is composed of 8 RDMAs, 4 MERGEs and
an ETHDR. Two RDMAs merge into one layer, so this module support 4
layers.

Signed-off-by: Nancy.Lin <redacted>
---
 drivers/gpu/drm/mediatek/Makefile             |   3 +-
 .../gpu/drm/mediatek/mtk_disp_ovl_adaptor.c   | 528 ++++++++++++++++++
 .../gpu/drm/mediatek/mtk_disp_ovl_adaptor.h   |  19 +
 3 files changed, 549 insertions(+), 1 deletion(-)
 create mode 100644 drivers/gpu/drm/mediatek/mtk_disp_ovl_adaptor.c
 create mode 100644 drivers/gpu/drm/mediatek/mtk_disp_ovl_adaptor.h

diff --git a/drivers/gpu/drm/mediatek/Makefile b/drivers/gpu/drm/mediatek/Makefile
index 38ec2354a894..f04ac86c9593 100644
--- a/drivers/gpu/drm/mediatek/Makefile
+++ b/drivers/gpu/drm/mediatek/Makefile
@@ -13,7 +13,8 @@ mediatek-drm-y := mtk_disp_ccorr.o \
                  mtk_drm_plane.o \
                  mtk_dsi.o \
                  mtk_dpi.o \
-                 mtk_mdp_rdma.o
+                 mtk_mdp_rdma.o \
+                 mtk_disp_ovl_adaptor.o
Alphabetic order.

 obj-$(CONFIG_DRM_MEDIATEK) += mediatek-drm.o

diff --git a/drivers/gpu/drm/mediatek/mtk_disp_ovl_adaptor.c b/drivers/gpu/drm/mediatek/mtk_disp_ovl_adaptor.c
new file mode 100644
index 000000000000..8222ec5ff799
--- /dev/null
+++ b/drivers/gpu/drm/mediatek/mtk_disp_ovl_adaptor.c
@@ -0,0 +1,528 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (c) 2021 MediaTek Inc.
+ */
+
+#include <drm/drm_fourcc.h>
+#include <linux/clk.h>
+#include <linux/reset.h>
+#include <linux/component.h>
Alphabetic order.

+#include <linux/of_device.h>
+#include <linux/of_address.h>
+#include <linux/platform_device.h>
+#include <linux/pm_runtime.h>
+#include <linux/soc/mediatek/mtk-mmsys.h>
+#include <linux/soc/mediatek/mtk-cmdq.h>
+
+#include "mtk_drm_drv.h"
+#include "mtk_drm_crtc.h"
+#include "mtk_drm_ddp_comp.h"
+#include "mtk_disp_drv.h"
+#include "mtk_disp_ovl_adaptor.h"
+
+#define DISP_MERGE_ENABLE      0x0
+       #define MERGE_ENABLE BIT(0)
I would like

#define DISP_MERGE_ENABLE      0x0
#define MERGE_ENABLE                           BIT(0)

+#define DISP_MERGE_CFG_0       0x10
+#define DISP_MERGE_CFG_1       0x14
+#define DISP_MERGE_CFG_4       0x20
+#define DISP_MERGE_CFG_5       0x24
+#define DISP_MERGE_CFG_10      0x38
+       #define CFG_10_NO_SWAP 0
+#define DISP_MERGE_CFG_12      0x40
+       #define CFG12_10_10_1PI_2PO_BUF_MODE 6
+       #define CFG12_11_10_1PI_2PO_MERGE 18
+#define DISP_MERGE_CFG_24      0x70
+#define DISP_MERGE_CFG_25      0x74
+#define DISP_MERGE_CFG_26      0x78
+#define DISP_MERGE_CFG_27      0x7c
+#define DISP_MERGE_MUTE_0      0xf00
+
+#define MTK_OVL_ADAPTOR_RDMA_MAX_WIDTH 1920
+#define MTK_OVL_ADAPTOR_LAYER_NUM 4
+
+enum mtk_ovl_adaptor_comp_type {
+       OVL_ADAPTOR_TYPE_RDMA = 0,
+       OVL_ADAPTOR_TYPE_MERGE,
+       OVL_ADAPTOR_TYPE_NUM,
+};
+
+enum mtk_ovl_adaptor_comp_id {
+       OVL_ADAPTOR_MDP_RDMA0,
+       OVL_ADAPTOR_MDP_RDMA1,
+       OVL_ADAPTOR_MDP_RDMA2,
+       OVL_ADAPTOR_MDP_RDMA3,
+       OVL_ADAPTOR_MDP_RDMA4,
+       OVL_ADAPTOR_MDP_RDMA5,
+       OVL_ADAPTOR_MDP_RDMA6,
+       OVL_ADAPTOR_MDP_RDMA7,
+       OVL_ADAPTOR_MERGE0,
+       OVL_ADAPTOR_MERGE1,
+       OVL_ADAPTOR_MERGE2,
+       OVL_ADAPTOR_MERGE3,
+       OVL_ADAPTOR_ID_MAX
+};
+
+struct ovl_adaptor_comp_match {
+       enum mtk_ovl_adaptor_comp_type type;
+       int alias_id;
+};
+
+struct ovl_adaptor_merge_config {
+       unsigned int fmt;
+       unsigned int merge_mode;
+       unsigned int in_w[2];
+       unsigned int out_w[2];
+       unsigned int in_h;
+};
+
+struct mtk_ovl_adaptor_comp {
+       struct device *dev;
+       struct clk *clks[2];
+       struct cmdq_client_reg cmdq_base;
+       void __iomem *regs;
+};
keep only dev, other value should be moved to dev private data.

+
+struct mtk_disp_ovl_adaptor {
+       struct mtk_ovl_adaptor_comp ovl_adaptor_comp[OVL_ADAPTOR_ID_MAX];
+       struct device *mmsys_dev;
+};
+
+static const char * const ovl_adaptor_comp_str[] = {
+       "OVL_ADAPTOR_MDP_RDMA0",
+       "OVL_ADAPTOR_MDP_RDMA1",
+       "OVL_ADAPTOR_MDP_RDMA2",
+       "OVL_ADAPTOR_MDP_RDMA3",
+       "OVL_ADAPTOR_MDP_RDMA4",
+       "OVL_ADAPTOR_MDP_RDMA5",
+       "OVL_ADAPTOR_MDP_RDMA6",
+       "OVL_ADAPTOR_MDP_RDMA7",
+       "OVL_ADAPTOR_MERGE0",
+       "OVL_ADAPTOR_MERGE1",
+       "OVL_ADAPTOR_MERGE2",
+       "OVL_ADAPTOR_MERGE3",
+       "OVL_ADAPTOR_ID_MAX"
+};
+
+static const char * const private_comp_stem[OVL_ADAPTOR_TYPE_NUM] = {
+       [OVL_ADAPTOR_TYPE_RDMA] = "vdo1_rdma",
+       [OVL_ADAPTOR_TYPE_MERGE] = "merge",
+};
+
+static const struct ovl_adaptor_comp_match comp_matches[OVL_ADAPTOR_ID_MAX] = {
+       [OVL_ADAPTOR_MDP_RDMA0] =       { OVL_ADAPTOR_TYPE_RDMA, 0 },
+       [OVL_ADAPTOR_MDP_RDMA1] =       { OVL_ADAPTOR_TYPE_RDMA, 1 },
+       [OVL_ADAPTOR_MDP_RDMA2] =       { OVL_ADAPTOR_TYPE_RDMA, 2 },
+       [OVL_ADAPTOR_MDP_RDMA3] =       { OVL_ADAPTOR_TYPE_RDMA, 3 },
+       [OVL_ADAPTOR_MDP_RDMA4] =       { OVL_ADAPTOR_TYPE_RDMA, 4 },
+       [OVL_ADAPTOR_MDP_RDMA5] =       { OVL_ADAPTOR_TYPE_RDMA, 5 },
+       [OVL_ADAPTOR_MDP_RDMA6] =       { OVL_ADAPTOR_TYPE_RDMA, 6 },
+       [OVL_ADAPTOR_MDP_RDMA7] =       { OVL_ADAPTOR_TYPE_RDMA, 7 },
+       [OVL_ADAPTOR_MERGE0] =  { OVL_ADAPTOR_TYPE_MERGE, 1 },
+       [OVL_ADAPTOR_MERGE1] =  { OVL_ADAPTOR_TYPE_MERGE, 2 },
+       [OVL_ADAPTOR_MERGE2] =  { OVL_ADAPTOR_TYPE_MERGE, 3 },
+       [OVL_ADAPTOR_MERGE3] =  { OVL_ADAPTOR_TYPE_MERGE, 4 },
+};
+
+static void mtk_ovl_adaptor_merge_config(struct mtk_ovl_adaptor_comp *comp,
+                                        struct ovl_adaptor_merge_config *merge_cfg,
+                                        struct cmdq_pkt *cmdq_pkt)
+{
+       switch (merge_cfg->merge_mode) {
+       case 6:
+               mtk_ddp_write(cmdq_pkt, (merge_cfg->in_h << 16 | merge_cfg->in_w[0]),
+                             &comp->cmdq_base, comp->regs, DISP_MERGE_CFG_0);
+               mtk_ddp_write(cmdq_pkt, (merge_cfg->in_h << 16 | merge_cfg->out_w[0]),
+                             &comp->cmdq_base, comp->regs, DISP_MERGE_CFG_4);
+               mtk_ddp_write(cmdq_pkt, (merge_cfg->in_h << 16 | merge_cfg->in_w[0]),
+                             &comp->cmdq_base, comp->regs, DISP_MERGE_CFG_24);
+               mtk_ddp_write(cmdq_pkt, (merge_cfg->in_h << 16 | merge_cfg->in_w[0]),
+                             &comp->cmdq_base, comp->regs, DISP_MERGE_CFG_25);
+               break;
+       case 18:
+               mtk_ddp_write(cmdq_pkt, (merge_cfg->in_h << 16 | merge_cfg->in_w[0]),
+                             &comp->cmdq_base, comp->regs, DISP_MERGE_CFG_0);
+               mtk_ddp_write(cmdq_pkt, (merge_cfg->in_h << 16 | merge_cfg->in_w[1]),
+                             &comp->cmdq_base, comp->regs, DISP_MERGE_CFG_1);
+               mtk_ddp_write(cmdq_pkt, (merge_cfg->in_h << 16 | merge_cfg->out_w[0]),
+                             &comp->cmdq_base, comp->regs, DISP_MERGE_CFG_4);
+               mtk_ddp_write(cmdq_pkt, (merge_cfg->in_h << 16 | merge_cfg->in_w[0]),
+                             &comp->cmdq_base, comp->regs, DISP_MERGE_CFG_24);
+               mtk_ddp_write(cmdq_pkt, (merge_cfg->in_h << 16 | merge_cfg->in_w[1]),
+                             &comp->cmdq_base, comp->regs, DISP_MERGE_CFG_25);
+               mtk_ddp_write(cmdq_pkt, (merge_cfg->in_h << 16 | merge_cfg->in_w[0]),
+                             &comp->cmdq_base, comp->regs, DISP_MERGE_CFG_26);
+               mtk_ddp_write(cmdq_pkt, (merge_cfg->in_h << 16 | merge_cfg->in_w[1]),
+                             &comp->cmdq_base, comp->regs, DISP_MERGE_CFG_27);
+               break;
+       default:
+               break;
+       }
+
+       mtk_ddp_write(cmdq_pkt, merge_cfg->merge_mode, &comp->cmdq_base,
+                     comp->regs, DISP_MERGE_CFG_12);
+       mtk_ddp_write(cmdq_pkt, CFG_10_NO_SWAP, &comp->cmdq_base,
+                     comp->regs, DISP_MERGE_CFG_10);
+       mtk_ddp_write_mask(cmdq_pkt, 1, &comp->cmdq_base, comp->regs,
+                          DISP_MERGE_ENABLE, MERGE_ENABLE);
Move this function to merge driver.

+}
+
+void mtk_ovl_adaptor_layer_config(struct device *dev, unsigned int idx,
+                                 struct mtk_plane_state *state,
+                                 struct cmdq_pkt *cmdq_pkt)
+{
+       struct mtk_disp_ovl_adaptor *ovl_adaptor = dev_get_drvdata(dev);
+       struct mtk_plane_pending_state *pending = &state->pending;
+       struct ovl_adaptor_merge_config merge_cfg = {0};
+       struct mtk_mdp_rdma_cfg rdma_config = {0};
+       struct mtk_ovl_adaptor_comp *rdma_l;
+       struct mtk_ovl_adaptor_comp *rdma_r;
+       struct mtk_ovl_adaptor_comp *merge;
+       const struct drm_format_info *fmt_info = drm_format_info(pending->format);
+       bool use_dual_pipe = false;
+
+       dev_dbg(dev, "%s+ idx:%d, enable:%d, fmt:0x%x\n", __func__, idx,
+               pending->enable, pending->format);
+       dev_dbg(dev, "addr 0x%lx, fb w:%d, {%d,%d,%d,%d}\n",
+               pending->addr, (pending->pitch / fmt_info->cpp[0]),
+               pending->x, pending->y, pending->width, pending->height);
+
+       rdma_l = &ovl_adaptor->ovl_adaptor_comp[OVL_ADAPTOR_MDP_RDMA0 + 2 * idx];
+       rdma_r = &ovl_adaptor->ovl_adaptor_comp[OVL_ADAPTOR_MDP_RDMA0 + 2 * idx + 1];
+       merge = &ovl_adaptor->ovl_adaptor_comp[OVL_ADAPTOR_MERGE0 + idx];
+
+       if (!pending->enable) {
+               mtk_ddp_write_mask(cmdq_pkt, 0x0, &merge->cmdq_base, merge->regs,
+                                  DISP_MERGE_ENABLE, MERGE_ENABLE);
Ditto.

+               mtk_mdp_rdma_stop(rdma_l->regs, cmdq_pkt, &rdma_l->cmdq_base);
+               mtk_mdp_rdma_stop(rdma_r->regs, cmdq_pkt, &rdma_r->cmdq_base);
+               return;
+       }
+
+       if (pending->width > MTK_OVL_ADAPTOR_RDMA_MAX_WIDTH)
+               use_dual_pipe = true;
+
+       merge_cfg.out_w[0] = pending->width;
+       merge_cfg.in_h = pending->height;
+       merge_cfg.fmt = pending->format;
+       if (use_dual_pipe) {
+               merge_cfg.merge_mode = CFG12_11_10_1PI_2PO_MERGE;
+               merge_cfg.in_w[0] = (pending->width / 2) + ((pending->width / 2) % 2);
+               merge_cfg.in_w[1] = (pending->width / 2) - ((pending->width / 2) % 2);
merge_cfg.in_w[1] = pending->width - merge_cfg.in_w[0];

+       } else {
+               merge_cfg.merge_mode = CFG12_10_10_1PI_2PO_BUF_MODE;
+               merge_cfg.in_w[0] = pending->width;
+       }
+       mtk_ovl_adaptor_merge_config(merge, &merge_cfg, cmdq_pkt);
+
+       mtk_mmsys_ddp_config(ovl_adaptor->mmsys_dev, MMSYS_CONFIG_MERGE_ASYNC_WIDTH,
+                            idx, pending->width / 2, cmdq_pkt);
+       mtk_mmsys_ddp_config(ovl_adaptor->mmsys_dev, MMSYS_CONFIG_MERGE_ASYNC_HEIGHT,
+                            idx, pending->height, cmdq_pkt);
+
+       rdma_config.source_width = pending->pitch / fmt_info->cpp[0];
+       rdma_config.csc_enable = fmt_info->is_yuv ? true : false;
+       rdma_config.profile = RDMA_CSC_FULL709_TO_RGB;
+       rdma_config.width = merge_cfg.in_w[0];
+       rdma_config.height = pending->height;
+       rdma_config.addr0 = pending->addr;
+       rdma_config.pitch = pending->pitch;
+       rdma_config.fmt = pending->format;
+       mtk_mdp_rdma_config(rdma_l->regs, &rdma_config, cmdq_pkt, &rdma_l->cmdq_base);
+
+       rdma_config.x_left = merge_cfg.in_w[0];
+       rdma_config.width = merge_cfg.in_w[1];
+       mtk_mdp_rdma_config(rdma_r->regs, &rdma_config, cmdq_pkt, &rdma_r->cmdq_base);
+
+       mtk_ddp_write_mask(cmdq_pkt, 0x1, &merge->cmdq_base, merge->regs,
+                          DISP_MERGE_ENABLE, MERGE_ENABLE);
+       mtk_ddp_write_mask(cmdq_pkt, 0x0, &merge->cmdq_base, merge->regs,
+                          DISP_MERGE_MUTE_0, 0x1);
Move this to merge driver.

+
+       mtk_mdp_rdma_start(rdma_l->regs, cmdq_pkt, &rdma_l->cmdq_base);
+       if (use_dual_pipe)
+               mtk_mdp_rdma_start(rdma_r->regs, cmdq_pkt, &rdma_r->cmdq_base);
+       else
+               mtk_mdp_rdma_stop(rdma_r->regs, cmdq_pkt, &rdma_r->cmdq_base);
+}
+
+void mtk_ovl_adaptor_stop(struct device *dev)
+{
+       struct mtk_disp_ovl_adaptor *ovl_adaptor = dev_get_drvdata(dev);
+       struct mtk_ovl_adaptor_comp *rdma_l;
+       struct mtk_ovl_adaptor_comp *rdma_r;
+       struct mtk_ovl_adaptor_comp *merge;
+       unsigned int reg;
+       u32 i;
+
+       for (i = 0; i < MTK_OVL_ADAPTOR_LAYER_NUM; i++) {
+               rdma_l = &ovl_adaptor->ovl_adaptor_comp[OVL_ADAPTOR_MDP_RDMA0 + 2 * i];
+               rdma_r = &ovl_adaptor->ovl_adaptor_comp[OVL_ADAPTOR_MDP_RDMA0 + 2 * i + 1];
+               merge = &ovl_adaptor->ovl_adaptor_comp[OVL_ADAPTOR_MERGE0 + i];
+
+               mtk_mdp_rdma_stop(rdma_l->regs, NULL, &rdma_l->cmdq_base);
+               mtk_mdp_rdma_stop(rdma_r->regs, NULL, &rdma_r->cmdq_base);
+
+               reg = readl(merge->regs + DISP_MERGE_ENABLE);
+               reg = reg & ~MERGE_ENABLE;
+               writel_relaxed(reg, merge->regs + DISP_MERGE_ENABLE);
Ditto.

+
+               device_reset_optional(merge->dev);
+       }
+}
+
+int mtk_ovl_adaptor_clk_enable(struct device *dev)
+{
+       struct mtk_disp_ovl_adaptor *ovl_adaptor = dev_get_drvdata(dev);
+       struct mtk_ovl_adaptor_comp *comp;
+       int ret;
+       int i;
+       int j;
+
+       for (i = OVL_ADAPTOR_MDP_RDMA0; i < OVL_ADAPTOR_ID_MAX; i++) {
+               comp = &ovl_adaptor->ovl_adaptor_comp[i];
+               if (!comp->dev)
+                       continue;
+
+               /* Need to power on for private rdma devices */
+               if (i < OVL_ADAPTOR_MERGE0) {
+                       ret = pm_runtime_get_sync(comp->dev);
+                       if (ret < 0)
+                               dev_err(dev,
+                                       "Failed to power on, err %d-%s\n",
+                                       ret, ovl_adaptor_comp_str[i]);
undo previos pm_runtime_get_sync() and return error.

+               }
+
+               for (j = 0; j < ARRAY_SIZE(comp->clks); j++) {
+                       if (IS_ERR(comp->clks[j]))
+                               break;
+
+                       ret = clk_prepare_enable(comp->clks[j]);
+                       if (ret)
+                               dev_err(dev,
+                                       "Failed to enable clock %d, err %d-%s\n",
+                                       i, ret, ovl_adaptor_comp_str[i]);
undo and previous job and return error.

+               }
+       }
+
+       return ret;
+}
+
+void mtk_ovl_adaptor_clk_disable(struct device *dev)
+{
+       struct mtk_disp_ovl_adaptor *ovl_adaptor = dev_get_drvdata(dev);
+       struct mtk_ovl_adaptor_comp *comp;
+       int ret;
+       int i;
+       int j;
+
+       for (i = OVL_ADAPTOR_MDP_RDMA0; i < OVL_ADAPTOR_ID_MAX; i++) {
+               comp = &ovl_adaptor->ovl_adaptor_comp[i];
+               if (!comp->dev)
+                       continue;
+
+               for (j = 0; i < ARRAY_SIZE(comp->clks); j++) {
+                       if (IS_ERR(comp->clks[j]))
+                               break;
+                       clk_disable_unprepare(comp->clks[j]);
+               }
+
+               /* Need to power off for private rdma devices */
+               if (i < OVL_ADAPTOR_MERGE0) {
+                       ret = pm_runtime_put(comp->dev);
+                       if (ret < 0)
+                               dev_err(dev,
+                                       "Failed to power off, err-%s\n",
+                                       ret, ovl_adaptor_comp_str[i]);
+               }
+       }
+}
+
+static int ovl_adaptor_comp_get_id(struct device *dev, struct device_node *node,
+                                  enum mtk_ovl_adaptor_comp_type type)
+{
+       int alias_id = of_alias_get_id(node, private_comp_stem[type]);
+       int ret;
+       int i;
+
+       for (i = 0; i < ARRAY_SIZE(comp_matches); i++)
+               if (comp_matches[i].type == type &&
+                   comp_matches[i].alias_id == alias_id)
+                       return i;
+
+       dev_err(dev, "Failed to get id. type: %d, alias: %d\n", type, alias_id);
+       return -EINVAL;
+}
+
+static int private_comp_init(struct device *dev, struct device_node *node,
+                            struct mtk_ovl_adaptor_comp *comp,
+                            enum mtk_ovl_adaptor_comp_id id)
+{
+       struct platform_device *comp_pdev;
+       int ret;
+       int i;
+
+       if (id < 0 || id >= OVL_ADAPTOR_ID_MAX) {
+               dev_err(dev, "Invalid component id %d\n", id);
+               return -EINVAL;
+       }
+
+       comp_pdev = of_find_device_by_node(node);
+       if (!comp_pdev) {
+               dev_warn(dev, "can't find platform device of node:%s\n",
+                        node->name);
+               return -ENODEV;
+       }
+       comp->dev = &comp_pdev->dev;
+       comp->regs = of_iomap(node, 0);
+
+       for (i = 0; i < ARRAY_SIZE(comp->clks); i++) {
+               comp->clks[i] = of_clk_get(node, i);
+               if (IS_ERR(comp->clks[i]))
+                       break;
+       }
+
+#if IS_REACHABLE(CONFIG_MTK_CMDQ)
+       ret = cmdq_dev_get_client_reg(comp->dev, &comp->cmdq_base, 0);
+       if (ret)
+               dev_info(dev, "get mediatek,gce-client-reg fail!\n");
+#endif
+
+       if (id < OVL_ADAPTOR_MERGE0)
+               pm_runtime_enable(comp->dev);
+
+       dev_info(dev, "[DRM]regs:0x%p, node:%s\n", comp->regs, ovl_adaptor_comp_str[id]);
+
+       return 0;
+}
+
+static int mtk_disp_ovl_adaptor_comp_probe(struct platform_device *pdev)
+{
+       return 0;
+}
+
+static int mtk_disp_ovl_adaptor_comp_remove(struct platform_device *pdev)
+{
+       return 0;
+}
+
+static const struct of_device_id mtk_ovl_adaptor_comp_dt_ids[] = {
+       {
+               .compatible = "mediatek,mt8195-vdo1-rdma",
+               .data = (void *)OVL_ADAPTOR_TYPE_RDMA,
+       }, {
+               .compatible = "mediatek,mt8195-vdo1-merge",
+               .data = (void *)OVL_ADAPTOR_TYPE_MERGE,
+       },
+       {},
+};
+
+static struct platform_driver mtk_disp_ovl_adaptor_comp_driver = {
+       .probe          = mtk_disp_ovl_adaptor_comp_probe,
+       .remove         = mtk_disp_ovl_adaptor_comp_remove,
+       .driver = {
+               .name   = "mediatek-disp-ovl-adaptor-comp",
+               .owner  = THIS_MODULE,
+               .of_match_table = mtk_ovl_adaptor_comp_dt_ids,
+       },
+};
+module_platform_driver(mtk_disp_ovl_adaptor_comp_driver);
+
+static int ovl_adaptor_comp_init(struct device *dev)
+{
+       struct mtk_disp_ovl_adaptor *priv = dev_get_drvdata(dev);
+       struct device_node *node, *parent;
+       int i, ret;
+
+       parent = dev->parent->of_node->parent;
+
+       for_each_child_of_node(parent, node) {
+               const struct of_device_id *of_id;
+               enum mtk_ovl_adaptor_comp_type type;
+               struct mtk_ovl_adaptor_comp *comp;
+               int id;
+
+               of_id = of_match_node(mtk_ovl_adaptor_comp_dt_ids, node);
+               if (!of_id)
+                       continue;
+
+               if (!of_device_is_available(node)) {
+                       dev_info(dev, "Skipping disabled component %pOF\n",
+                                node);
+                       continue;
+               }
+
+               type = (enum mtk_ovl_adaptor_comp_type)of_id->data;
+               id = ovl_adaptor_comp_get_id(dev, node, type);
+               if (id < 0) {
+                       dev_warn(dev, "Skipping unknown component %pOF\n",
+                                node);
+                       continue;
+               }
+
+               ret = private_comp_init(dev, node, &priv->ovl_adaptor_comp[id], id);
+               if (ret)
+                       return ret;
+       }
+
+       return 0;
+}
+
+static const struct of_device_id ovl_adaptor_driver_dt_match[] = {
+       { .compatible = "mediatek,mt8195-disp-ethdr"},
+       {},
+};
+MODULE_DEVICE_TABLE(of, mtk_disp_ovl_adaptor_driver_dt_match);
+
+static int mtk_disp_ovl_adaptor_probe(struct platform_device *pdev)
+{
+       struct mtk_disp_ovl_adaptor *priv;
+       struct device *dev = &pdev->dev;
+       struct device_node *phandle = dev->parent->of_node;
+       const struct of_device_id *of_id;
+       int ret;
+       int i;
+
+       dev_info(dev, "%s+\n", __func__);
+
+       of_id = of_match_node(ovl_adaptor_driver_dt_match, phandle);
+       if (!of_id)
+               return -ENODEV;
+
+       priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
+       if (!priv)
+               return -ENOMEM;
+
+       priv->mmsys_dev = pdev->dev.platform_data;
+
+       platform_set_drvdata(pdev, priv);
+
+       ret = ovl_adaptor_comp_init(dev);
+       if (ret) {
+               dev_notice(dev, "ovl_adaptor comp init fail\n");
+               return ret;
+       }
+
+       dev_info(dev, "%s-\n", __func__);
+       return ret;
+}
+
+static int mtk_disp_ovl_adaptor_remove(struct platform_device *pdev)
+{
+       struct mtk_disp_ovl_adaptor *ovl_adaptor = dev_get_drvdata(&pdev->dev);
+       int i;
+
+       for (i = OVL_ADAPTOR_MDP_RDMA0; i < OVL_ADAPTOR_MERGE0; i++)
+               pm_runtime_disable(ovl_adaptor->ovl_adaptor_comp[i].dev);
+
+       return 0;
+}
+
+struct platform_driver mtk_disp_ovl_adaptor_driver = {
+       .probe = mtk_disp_ovl_adaptor_probe,
+       .remove = mtk_disp_ovl_adaptor_remove,
+       .driver = {
+                       .name = "mediatek-disp-ovl-adaptor",
+                       .owner = THIS_MODULE,
+               },
+};
+module_platform_driver(mtk_disp_ovl_adaptor_driver);
diff --git a/drivers/gpu/drm/mediatek/mtk_disp_ovl_adaptor.h b/drivers/gpu/drm/mediatek/mtk_disp_ovl_adaptor.h
new file mode 100644
index 000000000000..7d757be1f491
--- /dev/null
+++ b/drivers/gpu/drm/mediatek/mtk_disp_ovl_adaptor.h
@@ -0,0 +1,19 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+/*
+ * Copyright (c) 2021 MediaTek Inc.
+ */
+
+#ifndef __MTK_DISP_OVL_ADAPTOR_H__
+#define __MTK_DISP_OVL_ADAPTOR_H__
+
+#include <drm/mediatek_drm.h>
+
+void mtk_ovl_adaptor_stop(struct device *dev);
+int mtk_ovl_adaptor_clk_enable(struct device *dev);
+void mtk_ovl_adaptor_clk_disable(struct device *dev);
+void mtk_ovl_adaptor_layer_config(struct device *dev, unsigned int idx,
+                                 struct mtk_plane_state *state,
+                                 struct cmdq_pkt *cmdq_pkt);
+
+#endif
+
--
2.18.0
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