Quelle  mtk_disp_ovl_adaptor.c   Sprache: C

// SPDX-License-Identifier: GPL-2.0-only
/*
 * Copyright (c) 2021 MediaTek Inc.
 */

#include <drm/drm_fourcc.h>
#include <drm/drm_of.h>
#include <linux/clk.h>
#include <linux/component.h>
#include <linux/of.h>
#include <linux/of_address.h>
#include <linux/of_platform.h>
#include <linux/platform_device.h>
#include <linux/pm_runtime.h>
#include <linux/reset.h>
#include <linux/soc/mediatek/mtk-cmdq.h>
#include <linux/soc/mediatek/mtk-mmsys.h>
#include <linux/soc/mediatek/mtk-mutex.h>

#include "mtk_ddp_comp.h"
#include "mtk_disp_drv.h"
#include "mtk_drm_drv.h"
#include "mtk_ethdr.h"

#define MTK_OVL_ADAPTOR_RDMA_MAX_WIDTH 1920
#define MTK_OVL_ADAPTOR_LAYER_NUM 4

enum mtk_ovl_adaptor_comp_type {
 OVL_ADAPTOR_TYPE_ETHDR,
 OVL_ADAPTOR_TYPE_MDP_RDMA,
 OVL_ADAPTOR_TYPE_MERGE,
 OVL_ADAPTOR_TYPE_PADDING,
 OVL_ADAPTOR_TYPE_NUM,
};

enum mtk_ovl_adaptor_comp_id {
 OVL_ADAPTOR_ETHDR0,
 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_PADDING0,
 OVL_ADAPTOR_PADDING1,
 OVL_ADAPTOR_PADDING2,
 OVL_ADAPTOR_PADDING3,
 OVL_ADAPTOR_PADDING4,
 OVL_ADAPTOR_PADDING5,
 OVL_ADAPTOR_PADDING6,
 OVL_ADAPTOR_PADDING7,
 OVL_ADAPTOR_ID_MAX
};

struct ovl_adaptor_comp_match {
 enum mtk_ovl_adaptor_comp_type type;
 enum mtk_ddp_comp_id comp_id;
 int alias_id;
 const struct mtk_ddp_comp_funcs *funcs;
};

struct mtk_disp_ovl_adaptor {
 struct device *ovl_adaptor_comp[OVL_ADAPTOR_ID_MAX];
 struct device *mmsys_dev;
 bool children_bound;
};

static const char * const private_comp_stem[OVL_ADAPTOR_TYPE_NUM] = {
 [OVL_ADAPTOR_TYPE_ETHDR] = "ethdr",
 [OVL_ADAPTOR_TYPE_MDP_RDMA] = "vdo1-rdma",
 [OVL_ADAPTOR_TYPE_MERGE] = "merge",
 [OVL_ADAPTOR_TYPE_PADDING] = "padding",
};

static const struct mtk_ddp_comp_funcs ethdr = {
 .clk_enable = mtk_ethdr_clk_enable,
 .clk_disable = mtk_ethdr_clk_disable,
 .start = mtk_ethdr_start,
 .stop = mtk_ethdr_stop,
};

static const struct mtk_ddp_comp_funcs merge = {
 .clk_enable = mtk_merge_clk_enable,
 .clk_disable = mtk_merge_clk_disable,
 .mode_valid = mtk_merge_mode_valid,
};

static const struct mtk_ddp_comp_funcs padding = {
 .clk_enable = mtk_padding_clk_enable,
 .clk_disable = mtk_padding_clk_disable,
 .start = mtk_padding_start,
 .stop = mtk_padding_stop,
};

static const struct mtk_ddp_comp_funcs rdma = {
 .power_on = mtk_mdp_rdma_power_on,
 .power_off = mtk_mdp_rdma_power_off,
 .clk_enable = mtk_mdp_rdma_clk_enable,
 .clk_disable = mtk_mdp_rdma_clk_disable,
};

static const struct ovl_adaptor_comp_match comp_matches[OVL_ADAPTOR_ID_MAX] = {
 [OVL_ADAPTOR_ETHDR0] = { OVL_ADAPTOR_TYPE_ETHDR, DDP_COMPONENT_ETHDR_MIXER, 0, ðdr },
 [OVL_ADAPTOR_MDP_RDMA0] = { OVL_ADAPTOR_TYPE_MDP_RDMA, DDP_COMPONENT_MDP_RDMA0, 0, &rdma&nbsp;},
 [OVL_ADAPTOR_MDP_RDMA1] = { OVL_ADAPTOR_TYPE_MDP_RDMA, DDP_COMPONENT_MDP_RDMA1, 1, &rdma&nbsp;},
 [OVL_ADAPTOR_MDP_RDMA2] = { OVL_ADAPTOR_TYPE_MDP_RDMA, DDP_COMPONENT_MDP_RDMA2, 2, &rdma&nbsp;},
 [OVL_ADAPTOR_MDP_RDMA3] = { OVL_ADAPTOR_TYPE_MDP_RDMA, DDP_COMPONENT_MDP_RDMA3, 3, &rdma&nbsp;},
 [OVL_ADAPTOR_MDP_RDMA4] = { OVL_ADAPTOR_TYPE_MDP_RDMA, DDP_COMPONENT_MDP_RDMA4, 4, &rdma&nbsp;},
 [OVL_ADAPTOR_MDP_RDMA5] = { OVL_ADAPTOR_TYPE_MDP_RDMA, DDP_COMPONENT_MDP_RDMA5, 5, &rdma&nbsp;},
 [OVL_ADAPTOR_MDP_RDMA6] = { OVL_ADAPTOR_TYPE_MDP_RDMA, DDP_COMPONENT_MDP_RDMA6, 6, &rdma&nbsp;},
 [OVL_ADAPTOR_MDP_RDMA7] = { OVL_ADAPTOR_TYPE_MDP_RDMA, DDP_COMPONENT_MDP_RDMA7, 7, &rdma&nbsp;},
 [OVL_ADAPTOR_MERGE0] = { OVL_ADAPTOR_TYPE_MERGE, DDP_COMPONENT_MERGE1, 1, &merge },
 [OVL_ADAPTOR_MERGE1] = { OVL_ADAPTOR_TYPE_MERGE, DDP_COMPONENT_MERGE2, 2, &merge },
 [OVL_ADAPTOR_MERGE2] = { OVL_ADAPTOR_TYPE_MERGE, DDP_COMPONENT_MERGE3, 3, &merge },
 [OVL_ADAPTOR_MERGE3] = { OVL_ADAPTOR_TYPE_MERGE, DDP_COMPONENT_MERGE4, 4, &merge },
 [OVL_ADAPTOR_PADDING0] = { OVL_ADAPTOR_TYPE_PADDING, DDP_COMPONENT_PADDING0, 0, &padding },
 [OVL_ADAPTOR_PADDING1] = { OVL_ADAPTOR_TYPE_PADDING, DDP_COMPONENT_PADDING1, 1, &padding },
 [OVL_ADAPTOR_PADDING2] = { OVL_ADAPTOR_TYPE_PADDING, DDP_COMPONENT_PADDING2, 2, &padding },
 [OVL_ADAPTOR_PADDING3] = { OVL_ADAPTOR_TYPE_PADDING, DDP_COMPONENT_PADDING3, 3, &padding },
 [OVL_ADAPTOR_PADDING4] = { OVL_ADAPTOR_TYPE_PADDING, DDP_COMPONENT_PADDING4, 4, &padding },
 [OVL_ADAPTOR_PADDING5] = { OVL_ADAPTOR_TYPE_PADDING, DDP_COMPONENT_PADDING5, 5, &padding },
 [OVL_ADAPTOR_PADDING6] = { OVL_ADAPTOR_TYPE_PADDING, DDP_COMPONENT_PADDING6, 6, &padding },
 [OVL_ADAPTOR_PADDING7] = { OVL_ADAPTOR_TYPE_PADDING, DDP_COMPONENT_PADDING7, 7, &padding },
};

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 mtk_mdp_rdma_cfg rdma_config = {0};
 struct device *rdma_l;
 struct device *rdma_r;
 struct device *merge;
 struct device *ethdr;
 const struct drm_format_info *fmt_info = drm_format_info(pending->format);
 bool use_dual_pipe = false;
 unsigned int align_width;
 unsigned int l_w = 0;
 unsigned int r_w = 0;

 dev_dbg(dev, "%s+ idx:%d, enable:%d, fmt:0x%x\n", __func__, idx,
  pending->enable, pending->format);
 dev_dbg(dev, "addr 0x%pad, 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];
 ethdr = ovl_adaptor->ovl_adaptor_comp[OVL_ADAPTOR_ETHDR0];

 if (!pending->enable || !pending->width || !pending->height) {
  mtk_merge_stop_cmdq(merge, cmdq_pkt);
  mtk_mdp_rdma_stop(rdma_l, cmdq_pkt);
  mtk_mdp_rdma_stop(rdma_r, cmdq_pkt);
  mtk_ethdr_layer_config(ethdr, idx, state, cmdq_pkt);
  return;
 }

 /* ETHDR is in 1T2P domain, width needs to be 2 pixels align */
 align_width = ALIGN_DOWN(pending->width, 2);

 if (align_width > MTK_OVL_ADAPTOR_RDMA_MAX_WIDTH)
  use_dual_pipe = true;

 if (use_dual_pipe) {
  l_w = (align_width / 2) + ((pending->width / 2) % 2);
  r_w = align_width - l_w;
 } else {
  l_w = align_width;
 }
 mtk_merge_advance_config(merge, l_w, r_w, pending->height, 0, 0, cmdq_pkt);
 mtk_mmsys_merge_async_config(ovl_adaptor->mmsys_dev, idx, align_width / 2,
         pending->height, cmdq_pkt);

 rdma_config.width = l_w;
 rdma_config.height = pending->height;
 rdma_config.addr0 = pending->addr;
 rdma_config.pitch = pending->pitch;
 rdma_config.fmt = pending->format;
 rdma_config.color_encoding = pending->color_encoding;
 mtk_mdp_rdma_config(rdma_l, &rdma_config, cmdq_pkt);

 if (use_dual_pipe) {
  rdma_config.x_left = l_w;
  rdma_config.width = r_w;
  mtk_mdp_rdma_config(rdma_r, &rdma_config, cmdq_pkt);
 }

 mtk_merge_start_cmdq(merge, cmdq_pkt);

 mtk_mdp_rdma_start(rdma_l, cmdq_pkt);
 if (use_dual_pipe)
  mtk_mdp_rdma_start(rdma_r, cmdq_pkt);
 else
  mtk_mdp_rdma_stop(rdma_r, cmdq_pkt);

 mtk_ethdr_layer_config(ethdr, idx, state, cmdq_pkt);
}

void mtk_ovl_adaptor_config(struct device *dev, unsigned int w,
       unsigned int h, unsigned int vrefresh,
       unsigned int bpc, struct cmdq_pkt *cmdq_pkt)
{
 struct mtk_disp_ovl_adaptor *ovl_adaptor = dev_get_drvdata(dev);

 mtk_ethdr_config(ovl_adaptor->ovl_adaptor_comp[OVL_ADAPTOR_ETHDR0], w, h,
    vrefresh, bpc, cmdq_pkt);
}

void mtk_ovl_adaptor_start(struct device *dev)
{
 int i;
 struct mtk_disp_ovl_adaptor *ovl_adaptor = dev_get_drvdata(dev);

 for (i = 0; i < OVL_ADAPTOR_ID_MAX; i++) {
  if (!ovl_adaptor->ovl_adaptor_comp[i] ||
      !comp_matches[i].funcs->start)
   continue;

  comp_matches[i].funcs->start(ovl_adaptor->ovl_adaptor_comp[i]);
 }
}

void mtk_ovl_adaptor_stop(struct device *dev)
{
 int i;
 struct mtk_disp_ovl_adaptor *ovl_adaptor = dev_get_drvdata(dev);

 for (i = 0; i < OVL_ADAPTOR_ID_MAX; i++) {
  if (!ovl_adaptor->ovl_adaptor_comp[i] ||
      !comp_matches[i].funcs->stop)
   continue;

  comp_matches[i].funcs->stop(ovl_adaptor->ovl_adaptor_comp[i]);
 }
}

/**
 * power_off - Power off the devices in OVL adaptor
 * @dev: Device to be powered off
 * @num: Number of the devices to be powered off
 *
 * Calls the .power_off() ovl_adaptor component callback if it is present.
 */
static inline void power_off(struct device *dev, int num)
{
 struct mtk_disp_ovl_adaptor *ovl_adaptor = dev_get_drvdata(dev);
 int i;

 if (num > OVL_ADAPTOR_ID_MAX)
  num = OVL_ADAPTOR_ID_MAX;

 for (i = num - 1; i >= 0; i--) {
  if (!ovl_adaptor->ovl_adaptor_comp[i] ||
      !comp_matches[i].funcs->power_off)
   continue;

  comp_matches[i].funcs->power_off(ovl_adaptor->ovl_adaptor_comp[i]);
 }
}

/**
 * mtk_ovl_adaptor_power_on - Power on the devices in OVL adaptor
 * @dev: Device to be powered on
 *
 * Different from OVL, OVL adaptor is a pseudo device so
 * we didn't define it in the device tree, pm_runtime_resume_and_get()
 * called by .atomic_enable() power on no device in OVL adaptor,
 * we have to implement a function to do the job instead.
 *
 * Return: Zero for success or negative number for failure.
 */
int mtk_ovl_adaptor_power_on(struct device *dev)
{
 struct mtk_disp_ovl_adaptor *ovl_adaptor = dev_get_drvdata(dev);
 int i, ret;

 for (i = 0; i < OVL_ADAPTOR_ID_MAX; i++) {
  if (!ovl_adaptor->ovl_adaptor_comp[i] ||
      !comp_matches[i].funcs->power_on)
   continue;

  ret = comp_matches[i].funcs->power_on(ovl_adaptor->ovl_adaptor_comp[i]);
  if (ret < 0) {
   dev_err(dev, "Failed to enable power domain %d, err %d\n", i, ret);
   power_off(dev, i);
   return ret;
  }
 }
 return 0;
}

void mtk_ovl_adaptor_power_off(struct device *dev)
{
 power_off(dev, OVL_ADAPTOR_ID_MAX);
}

int mtk_ovl_adaptor_clk_enable(struct device *dev)
{
 struct mtk_disp_ovl_adaptor *ovl_adaptor = dev_get_drvdata(dev);
 struct device *comp;
 int ret;
 int i;

 for (i = 0; i < OVL_ADAPTOR_ID_MAX; i++) {
  comp = ovl_adaptor->ovl_adaptor_comp[i];
  if (!comp || !comp_matches[i].funcs->clk_enable)
   continue;
  ret = comp_matches[i].funcs->clk_enable(comp);
  if (ret) {
   dev_err(dev, "Failed to enable clock %d, err %d\n", i, ret);
   while (--i >= 0)
    comp_matches[i].funcs->clk_disable(comp);
   return ret;
  }
 }
 return 0;
}

void mtk_ovl_adaptor_clk_disable(struct device *dev)
{
 struct mtk_disp_ovl_adaptor *ovl_adaptor = dev_get_drvdata(dev);
 struct device *comp;
 int i;

 for (i = 0; i < OVL_ADAPTOR_ID_MAX; i++) {
  comp = ovl_adaptor->ovl_adaptor_comp[i];
  if (!comp || !comp_matches[i].funcs->clk_disable)
   continue;
  comp_matches[i].funcs->clk_disable(comp);
  if (i < OVL_ADAPTOR_MERGE0)
   pm_runtime_put(comp);
 }
}

enum drm_mode_status mtk_ovl_adaptor_mode_valid(struct device *dev,
      const struct drm_display_mode *mode)

{
 int i;
 struct mtk_disp_ovl_adaptor *ovl_adaptor = dev_get_drvdata(dev);

 for (i = 0; i < OVL_ADAPTOR_ID_MAX; i++) {
  dev = ovl_adaptor->ovl_adaptor_comp[i];
  if (!dev || !comp_matches[i].funcs->mode_valid)
   continue;
  return comp_matches[i].funcs->mode_valid(dev, mode);
 }
 return MODE_OK;
}

unsigned int mtk_ovl_adaptor_layer_nr(struct device *dev)
{
 return MTK_OVL_ADAPTOR_LAYER_NUM;
}

struct device *mtk_ovl_adaptor_dma_dev_get(struct device *dev)
{
 struct mtk_disp_ovl_adaptor *ovl_adaptor = dev_get_drvdata(dev);

 return ovl_adaptor->ovl_adaptor_comp[OVL_ADAPTOR_MDP_RDMA0];
}

void mtk_ovl_adaptor_register_vblank_cb(struct device *dev, void (*vblank_cb)(void *),
     void *vblank_cb_data)
{
 struct mtk_disp_ovl_adaptor *ovl_adaptor = dev_get_drvdata(dev);

 mtk_ethdr_register_vblank_cb(ovl_adaptor->ovl_adaptor_comp[OVL_ADAPTOR_ETHDR0],
         vblank_cb, vblank_cb_data);
}

void mtk_ovl_adaptor_unregister_vblank_cb(struct device *dev)
{
 struct mtk_disp_ovl_adaptor *ovl_adaptor = dev_get_drvdata(dev);

 mtk_ethdr_unregister_vblank_cb(ovl_adaptor->ovl_adaptor_comp[OVL_ADAPTOR_ETHDR0]);
}

void mtk_ovl_adaptor_enable_vblank(struct device *dev)
{
 struct mtk_disp_ovl_adaptor *ovl_adaptor = dev_get_drvdata(dev);

 mtk_ethdr_enable_vblank(ovl_adaptor->ovl_adaptor_comp[OVL_ADAPTOR_ETHDR0]);
}

void mtk_ovl_adaptor_disable_vblank(struct device *dev)
{
 struct mtk_disp_ovl_adaptor *ovl_adaptor = dev_get_drvdata(dev);

 mtk_ethdr_disable_vblank(ovl_adaptor->ovl_adaptor_comp[OVL_ADAPTOR_ETHDR0]);
}

u32 mtk_ovl_adaptor_get_blend_modes(struct device *dev)
{
 struct mtk_disp_ovl_adaptor *ovl_adaptor = dev_get_drvdata(dev);

 return mtk_ethdr_get_blend_modes(ovl_adaptor->ovl_adaptor_comp[OVL_ADAPTOR_ETHDR0]);
}

const u32 *mtk_ovl_adaptor_get_formats(struct device *dev)
{
 struct mtk_disp_ovl_adaptor *ovl_adaptor = dev_get_drvdata(dev);

 return mtk_mdp_rdma_get_formats(ovl_adaptor->ovl_adaptor_comp[OVL_ADAPTOR_MDP_RDMA0]);
}

size_t mtk_ovl_adaptor_get_num_formats(struct device *dev)
{
 struct mtk_disp_ovl_adaptor *ovl_adaptor = dev_get_drvdata(dev);

 return mtk_mdp_rdma_get_num_formats(ovl_adaptor->ovl_adaptor_comp[OVL_ADAPTOR_MDP_RDMA0]);
}

void mtk_ovl_adaptor_add_comp(struct device *dev, struct mtk_mutex *mutex)
{
 int i;
 struct mtk_disp_ovl_adaptor *ovl_adaptor = dev_get_drvdata(dev);

 for (i = 0; i < OVL_ADAPTOR_ID_MAX; i++) {
  if (!ovl_adaptor->ovl_adaptor_comp[i])
   continue;
  mtk_mutex_add_comp(mutex, comp_matches[i].comp_id);
 }
}

void mtk_ovl_adaptor_remove_comp(struct device *dev, struct mtk_mutex *mutex)
{
 int i;
 struct mtk_disp_ovl_adaptor *ovl_adaptor = dev_get_drvdata(dev);

 for (i = 0; i < OVL_ADAPTOR_ID_MAX; i++) {
  if (!ovl_adaptor->ovl_adaptor_comp[i])
   continue;
  mtk_mutex_remove_comp(mutex, comp_matches[i].comp_id);
 }
}

void mtk_ovl_adaptor_connect(struct device *dev, struct device *mmsys_dev, unsigned int next)
{
 mtk_mmsys_ddp_connect(mmsys_dev, DDP_COMPONENT_ETHDR_MIXER, next);
 mtk_mmsys_ddp_connect(mmsys_dev, DDP_COMPONENT_MDP_RDMA0, DDP_COMPONENT_MERGE1);
 mtk_mmsys_ddp_connect(mmsys_dev, DDP_COMPONENT_MDP_RDMA1, DDP_COMPONENT_MERGE1);
 mtk_mmsys_ddp_connect(mmsys_dev, DDP_COMPONENT_MDP_RDMA2, DDP_COMPONENT_MERGE2);
 mtk_mmsys_ddp_connect(mmsys_dev, DDP_COMPONENT_MERGE1, DDP_COMPONENT_ETHDR_MIXER);
 mtk_mmsys_ddp_connect(mmsys_dev, DDP_COMPONENT_MERGE2, DDP_COMPONENT_ETHDR_MIXER);
 mtk_mmsys_ddp_connect(mmsys_dev, DDP_COMPONENT_MERGE3, DDP_COMPONENT_ETHDR_MIXER);
 mtk_mmsys_ddp_connect(mmsys_dev, DDP_COMPONENT_MERGE4, DDP_COMPONENT_ETHDR_MIXER);
}

void mtk_ovl_adaptor_disconnect(struct device *dev, struct device *mmsys_dev, unsigned int next)
{
 mtk_mmsys_ddp_disconnect(mmsys_dev, DDP_COMPONENT_ETHDR_MIXER, next);
 mtk_mmsys_ddp_disconnect(mmsys_dev, DDP_COMPONENT_MDP_RDMA0, DDP_COMPONENT_MERGE1);
 mtk_mmsys_ddp_disconnect(mmsys_dev, DDP_COMPONENT_MDP_RDMA1, DDP_COMPONENT_MERGE1);
 mtk_mmsys_ddp_disconnect(mmsys_dev, DDP_COMPONENT_MDP_RDMA2, DDP_COMPONENT_MERGE2);
 mtk_mmsys_ddp_disconnect(mmsys_dev, DDP_COMPONENT_MERGE1, DDP_COMPONENT_ETHDR_MIXER);
 mtk_mmsys_ddp_disconnect(mmsys_dev, DDP_COMPONENT_MERGE2, DDP_COMPONENT_ETHDR_MIXER);
 mtk_mmsys_ddp_disconnect(mmsys_dev, DDP_COMPONENT_MERGE3, DDP_COMPONENT_ETHDR_MIXER);
 mtk_mmsys_ddp_disconnect(mmsys_dev, DDP_COMPONENT_MERGE4, DDP_COMPONENT_ETHDR_MIXER);
}

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 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_warn(dev, "Failed to get id. type: %d, alias: %d\n", type, alias_id);
 return -EINVAL;
}

static const struct of_device_id mtk_ovl_adaptor_comp_dt_ids[] = {
 { .compatible = "mediatek,mt8188-disp-padding", .data = (void *)OVL_ADAPTOR_TYPE_PADDING },
 { .compatible = "mediatek,mt8195-disp-ethdr", .data = (void *)OVL_ADAPTOR_TYPE_ETHDR },
 { .compatible = "mediatek,mt8195-disp-merge", .data = (void *)OVL_ADAPTOR_TYPE_MERGE },
 { .compatible = "mediatek,mt8195-vdo1-rdma", .data = (void *)OVL_ADAPTOR_TYPE_MDP_RDMA },
 { /* sentinel */ }
};

static int ovl_adaptor_of_get_ddp_comp_type(struct device_node *node,
         enum mtk_ovl_adaptor_comp_type *ctype)
{
 const struct of_device_id *of_id = of_match_node(mtk_ovl_adaptor_comp_dt_ids, node);

 if (!of_id)
  return -EINVAL;

 *ctype = (enum mtk_ovl_adaptor_comp_type)((uintptr_t)of_id->data);

 return 0;
}

bool mtk_ovl_adaptor_is_comp_present(struct device_node *node)
{
 enum mtk_ovl_adaptor_comp_type type;
 int ret;

 ret = ovl_adaptor_of_get_ddp_comp_type(node, &type);
 if (ret)
  return false;

 if (type >= OVL_ADAPTOR_TYPE_NUM)
  return false;

 /*
 * In the context of mediatek-drm, ETHDR, MDP_RDMA and Padding are
 * used exclusively by OVL Adaptor: if this component is not one of
 * those, it's likely not an OVL Adaptor path.
 */
 return type == OVL_ADAPTOR_TYPE_ETHDR ||
        type == OVL_ADAPTOR_TYPE_MDP_RDMA ||
        type == OVL_ADAPTOR_TYPE_PADDING;
}

static int ovl_adaptor_comp_init(struct device *dev, struct component_match **match)
{
 struct mtk_disp_ovl_adaptor *priv = dev_get_drvdata(dev);
 struct device_node *parent;
 struct platform_device *comp_pdev;

 parent = dev->parent->parent->of_node->parent;

 for_each_child_of_node_scoped(parent, node) {
  enum mtk_ovl_adaptor_comp_type type;
  int id, ret;

  ret = ovl_adaptor_of_get_ddp_comp_type(node, &type);
  if (ret)
   continue;

  if (!of_device_is_available(node)) {
   dev_dbg(dev, "Skipping disabled component %pOF\n",
    node);
   continue;
  }

  id = ovl_adaptor_comp_get_id(dev, node, type);
  if (id < 0) {
   dev_warn(dev, "Skipping unknown component %pOF\n",
     node);
   continue;
  }

  comp_pdev = of_find_device_by_node(node);
  if (!comp_pdev)
   return -EPROBE_DEFER;

  priv->ovl_adaptor_comp[id] = &comp_pdev->dev;

  drm_of_component_match_add(dev, match, component_compare_of, node);
  dev_dbg(dev, "Adding component match for %pOF\n", node);
 }

 if (!*match) {
  dev_err(dev, "No match device for ovl_adaptor\n");
  return -ENODEV;
 }

 return 0;
}

static int mtk_disp_ovl_adaptor_comp_bind(struct device *dev, struct device *master,
       void *data)
{
 struct mtk_disp_ovl_adaptor *priv = dev_get_drvdata(dev);

 if (!priv->children_bound)
  return -EPROBE_DEFER;

 return 0;
}

static void mtk_disp_ovl_adaptor_comp_unbind(struct device *dev, struct device *master,
          void *data)
{
}

static const struct component_ops mtk_disp_ovl_adaptor_comp_ops = {
 .bind = mtk_disp_ovl_adaptor_comp_bind,
 .unbind = mtk_disp_ovl_adaptor_comp_unbind,
};

static int mtk_disp_ovl_adaptor_master_bind(struct device *dev)
{
 struct mtk_disp_ovl_adaptor *priv = dev_get_drvdata(dev);
 int ret;

 ret = component_bind_all(dev, priv->mmsys_dev);
 if (ret)
  return dev_err_probe(dev, ret, "component_bind_all failed!\n");

 priv->children_bound = true;
 return 0;
}

static void mtk_disp_ovl_adaptor_master_unbind(struct device *dev)
{
 struct mtk_disp_ovl_adaptor *priv = dev_get_drvdata(dev);

 priv->children_bound = false;
}

static const struct component_master_ops mtk_disp_ovl_adaptor_master_ops = {
 .bind  = mtk_disp_ovl_adaptor_master_bind,
 .unbind  = mtk_disp_ovl_adaptor_master_unbind,
};

static int mtk_disp_ovl_adaptor_probe(struct platform_device *pdev)
{
 struct mtk_disp_ovl_adaptor *priv;
 struct device *dev = &pdev->dev;
 struct component_match *match = NULL;
 int ret;

 priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
 if (!priv)
  return -ENOMEM;

 platform_set_drvdata(pdev, priv);

 ret = ovl_adaptor_comp_init(dev, &match);
 if (ret < 0)
  return ret;

 priv->mmsys_dev = pdev->dev.platform_data;

 component_master_add_with_match(dev, &mtk_disp_ovl_adaptor_master_ops, match);

 pm_runtime_enable(dev);

 ret = component_add(dev, &mtk_disp_ovl_adaptor_comp_ops);
 if (ret != 0) {
  pm_runtime_disable(dev);
  return dev_err_probe(dev, ret, "Failed to add component\n");
 }

 return 0;
}

static void mtk_disp_ovl_adaptor_remove(struct platform_device *pdev)
{
 component_master_del(&pdev->dev, &mtk_disp_ovl_adaptor_master_ops);
 pm_runtime_disable(&pdev->dev);
}

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",
 },
};