Re: [PATCH v6 14/16] drm/mediatek: add ovl_adaptor support for MT8195

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  Hi, Nancy:

Nancy.Lin <nancy.lin@xxxxxxxxxxxx> 於 2021年10月4日 週一 下午2:21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 <nancy.lin@xxxxxxxxxxxx>
> ---
>  drivers/gpu/drm/mediatek/Makefile             |   1 +
>  drivers/gpu/drm/mediatek/mtk_disp_drv.h       |  16 +
>  .../gpu/drm/mediatek/mtk_disp_ovl_adaptor.c   | 498 ++++++++++++++++++
>  drivers/gpu/drm/mediatek/mtk_drm_drv.h        |   1 +
>  4 files changed, 516 insertions(+)
>  create mode 100644 drivers/gpu/drm/mediatek/mtk_disp_ovl_adaptor.c
>
> diff --git a/drivers/gpu/drm/mediatek/Makefile b/drivers/gpu/drm/mediatek/Makefile
> index fb158a1e7f06..3abd27d7c91d 100644
> --- a/drivers/gpu/drm/mediatek/Makefile
> +++ b/drivers/gpu/drm/mediatek/Makefile
> @@ -6,6 +6,7 @@ mediatek-drm-y := mtk_disp_aal.o \
>                   mtk_disp_gamma.o \
>                   mtk_disp_merge.o \
>                   mtk_disp_ovl.o \
> +                 mtk_disp_ovl_adaptor.o \
>                   mtk_disp_rdma.o \
>                   mtk_drm_crtc.o \
>                   mtk_drm_ddp_comp.o \
> diff --git a/drivers/gpu/drm/mediatek/mtk_disp_drv.h b/drivers/gpu/drm/mediatek/mtk_disp_drv.h
> index 2446ad0a4977..6a4f4c42aedb 100644
> --- a/drivers/gpu/drm/mediatek/mtk_disp_drv.h
> +++ b/drivers/gpu/drm/mediatek/mtk_disp_drv.h
> @@ -113,6 +113,22 @@ void mtk_rdma_enable_vblank(struct device *dev,
>                             void *vblank_cb_data);
>  void mtk_rdma_disable_vblank(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_config(struct device *dev, unsigned int w,
> +                           unsigned int h, unsigned int vrefresh,
> +                           unsigned int bpc, struct cmdq_pkt *cmdq_pkt);
> +void mtk_ovl_adaptor_layer_config(struct device *dev, unsigned int idx,
> +                                 struct mtk_plane_state *state,
> +                                 struct cmdq_pkt *cmdq_pkt);
> +void mtk_ovl_adaptor_enable_vblank(struct device *dev,
> +                                  void (*vblank_cb)(void *),
> +                                  void *vblank_cb_data);
> +void mtk_ovl_adaptor_disable_vblank(struct device *dev);
> +void mtk_ovl_adaptor_start(struct device *dev);
> +void mtk_ovl_adaptor_stop(struct device *dev);
> +unsigned int mtk_ovl_adaptor_layer_nr(struct device *dev);
> +
>  int mtk_mdp_rdma_clk_enable(struct device *dev);
>  void mtk_mdp_rdma_clk_disable(struct device *dev);
>  void mtk_mdp_rdma_start(struct device *dev, struct cmdq_pkt *cmdq_pkt);
> 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..bfb5a9d29c26
> --- /dev/null
> +++ b/drivers/gpu/drm/mediatek/mtk_disp_ovl_adaptor.c
> @@ -0,0 +1,498 @@
> +// 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_device.h>
> +#include <linux/of_address.h>
> +#include <linux/platform_device.h>
> +#include <linux/pm_runtime.h>
> +#include <linux/reset.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"

Alphabetic order.

> +#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_RDMA = 0,
> +       OVL_ADAPTOR_TYPE_MERGE,
> +       OVL_ADAPTOR_TYPE_ETHDR,
> +       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_ETHDR0,
> +       OVL_ADAPTOR_ID_MAX
> +};
> +
> +struct ovl_adaptor_comp_match {
> +       enum mtk_ovl_adaptor_comp_type type;
> +       int alias_id;
> +};
> +
> +struct mtk_disp_ovl_adaptor {
> +       struct device *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_ETHDR",
> +       "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",
> +       [OVL_ADAPTOR_TYPE_ETHDR] = "ethdr",
> +};
> +
> +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 },
> +       [OVL_ADAPTOR_ETHDR0] =  { OVL_ADAPTOR_TYPE_ETHDR, 0 },
> +};
> +
> +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 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%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];
> +       ethdr = ovl_adaptor->ovl_adaptor_comp[OVL_ADAPTOR_ETHDR0];
> +
> +       if (!pending->enable) {
> +               mtk_merge_disable(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 */
> +       pending->width = ALIGN_DOWN(pending->width, 2);

pending->width is passed from caller function, the caller function
does not expect that pending->width is modified by callee function.

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

This is neither l_w nor r_w, why?
For example, if pending->width is 1922, l_w is 962, r_w is 960, and
MMSYS_CONFIG_MERGE_ASYNC_WIDTH is 961.

> +       mtk_mmsys_ddp_config(ovl_adaptor->mmsys_dev, MMSYS_CONFIG_MERGE_ASYNC_HEIGHT,
> +                            idx, 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;
> +       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_enable(merge, cmdq_pkt);
> +       mtk_merge_unmute(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)
> +{
> +       struct mtk_disp_ovl_adaptor *ovl_adaptor = dev_get_drvdata(dev);
> +
> +       mtk_ethdr_start(ovl_adaptor->ovl_adaptor_comp[OVL_ADAPTOR_ETHDR0]);
> +}
> +
> +void mtk_ovl_adaptor_stop(struct device *dev)
> +{
> +       struct mtk_disp_ovl_adaptor *ovl_adaptor = dev_get_drvdata(dev);
> +       struct device *rdma_l;
> +       struct device *rdma_r;
> +       struct device *merge;
> +       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, NULL);
> +               mtk_mdp_rdma_stop(rdma_r, NULL);
> +               mtk_merge_stop(merge);

Does DRM framework not disable all layer before disable crtc? These
codes looks asymetric.

> +       }
> +
> +       mtk_ethdr_stop(ovl_adaptor->ovl_adaptor_comp[OVL_ADAPTOR_ETHDR0]);
> +}
> +
> +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 = OVL_ADAPTOR_MDP_RDMA0; i < OVL_ADAPTOR_ID_MAX; i++) {

In clk_err, you count i to zero, so

for (i = 0; i < OVL_ADAPTOR_ID_MAX; i++) {

> +               comp = ovl_adaptor->ovl_adaptor_comp[i];
> +
> +               if (i < OVL_ADAPTOR_MERGE0)
> +                       ret = mtk_mdp_rdma_clk_enable(comp);
> +               else if (i < OVL_ADAPTOR_ETHDR0)
> +                       ret = mtk_merge_clk_enable(comp);
> +               else
> +                       ret = mtk_ethdr_clk_enable(comp);
> +               if (ret) {
> +                       dev_err(dev,
> +                               "Failed to enable clock %d, err %d-%s\n",
> +                               i, ret, ovl_adaptor_comp_str[i]);

Drop ovl_adaptor_comp_str[] and print i instead of
ovl_adaptor_comp_str[i]. We could know what the i mean in driver code.


> +                       goto clk_err;
> +               }
> +       }
> +
> +       return ret;
> +
> +clk_err:
> +       while (--i >= 0) {
> +               comp = ovl_adaptor->ovl_adaptor_comp[i];
> +               if (i < OVL_ADAPTOR_MERGE0)
> +                       mtk_mdp_rdma_clk_disable(comp);
> +               else if (i < OVL_ADAPTOR_ETHDR0)
> +                       mtk_merge_clk_disable(comp);
> +               else
> +                       mtk_ethdr_clk_disable(comp);
> +       }
> +       return ret;
> +}
> +
> +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 = OVL_ADAPTOR_MDP_RDMA0; i < OVL_ADAPTOR_ID_MAX; i++) {

for (i = 0; i < OVL_ADAPTOR_ID_MAX; i++) {

> +               comp = ovl_adaptor->ovl_adaptor_comp[i];
> +
> +               if (i < OVL_ADAPTOR_MERGE0)
> +                       mtk_mdp_rdma_clk_disable(comp);
> +               else if (i < OVL_ADAPTOR_ETHDR0)
> +                       mtk_merge_clk_disable(comp);
> +               else
> +                       mtk_ethdr_clk_disable(comp);
> +       }
> +}
> +
> +unsigned int mtk_ovl_adaptor_layer_nr(struct device *dev)
> +{
> +       return MTK_OVL_ADAPTOR_LAYER_NUM;
> +}
> +
> +void mtk_ovl_adaptor_enable_vblank(struct device *dev, void (*vblank_cb)(void *),
> +                                  void *vblank_cb_data)
> +{
> +       struct mtk_disp_ovl_adaptor *ovl_adaptor = dev_get_drvdata(dev);
> +
> +       mtk_ethdr_enable_vblank(ovl_adaptor->ovl_adaptor_comp[OVL_ADAPTOR_ETHDR0],
> +                               vblank_cb, vblank_cb_data);
> +}
> +
> +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]);
> +}
> +
> +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 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-disp-merge",
> +               .data = (void *)OVL_ADAPTOR_TYPE_MERGE,
> +       }, {
> +               .compatible = "mediatek,mt8195-disp-ethdr",
> +               .data = (void *)OVL_ADAPTOR_TYPE_ETHDR,
> +       },
> +       {},
> +};
> +
> +static int compare_of(struct device *dev, void *data)
> +{
> +       return dev->of_node == data;
> +}
> +
> +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 *node, *parent;
> +       struct platform_device *comp_pdev;
> +       int i, ret;
> +
> +       parent = dev->parent->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;
> +               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;
> +               }
> +
> +               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;
> +               }
> +               priv->ovl_adaptor_comp[id] = &comp_pdev->dev;
> +
> +               drm_of_component_match_add(dev, match, compare_of, node);
> +               dev_info(dev, "Adding component match for %pOF\n", node);
> +       }
> +
> +       return 0;
> +}
> +
> +static int mtk_disp_ovl_adaptor_comp_bind(struct device *dev, struct device *master,
> +                                         void *data)
> +{
> +       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);
> +
> +       dev_info(dev, "%s-%d", __func__, __LINE__);
> +
> +       component_bind_all(dev, priv->mmsys_dev);
> +       return 0;
> +}
> +
> +static void mtk_disp_ovl_adaptor_master_unbind(struct device *dev)
> +{
> +}
> +
> +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_check_comp(struct device *dev)
> +{
> +       struct device_node *node;
> +
> +       for_each_child_of_node(dev->parent->parent->of_node->parent, node) {
> +               const struct of_device_id *of_id;
> +               struct platform_device *comp_pdev;
> +               enum mtk_ovl_adaptor_comp_type type;
> +               int id;
> +
> +               of_id = of_match_node(mtk_ovl_adaptor_comp_dt_ids, node);
> +               if (!of_id)
> +                       continue;
> +
> +               if (!of_device_is_available(node))
> +                       continue;
> +
> +               type = (enum mtk_ovl_adaptor_comp_type)of_id->data;
> +
> +               id = ovl_adaptor_comp_get_id(dev, node, type);
> +               if (id < 0)
> +                       continue;
> +
> +               comp_pdev = of_find_device_by_node(node);
> +               if (!comp_pdev)
> +                       return -EPROBE_DEFER;
> +
> +               if (!platform_get_drvdata(comp_pdev))
> +                       return -EPROBE_DEFER;

This function looks like ovl_adaptor_comp_init(), I think things could
be done once.

Regards,
Chun-Kuang.

> +       }
> +       return 0;
> +}
> +
> +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;
> +
> +       dev_info(dev, "%s+\n", __func__);
> +
> +       ret = mtk_disp_ovl_adaptor_check_comp(dev);
> +       if (ret < 0)
> +               return ret;
> +
> +       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, &match);
> +       if (ret) {
> +               dev_notice(dev, "ovl_adaptor comp init fail\n");
> +               return ret;
> +       }
> +       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);
> +               dev_err(dev, "Failed to add component: %d\n", ret);
> +       }
> +
> +       dev_info(dev, "%s-\n", __func__);
> +       return ret;
> +}
> +
> +static int mtk_disp_ovl_adaptor_remove(struct platform_device *pdev)
> +{
> +       component_del(&pdev->dev, &mtk_disp_ovl_adaptor_comp_ops);
> +       pm_runtime_disable(&pdev->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,
> +               },
> +};
> diff --git a/drivers/gpu/drm/mediatek/mtk_drm_drv.h b/drivers/gpu/drm/mediatek/mtk_drm_drv.h
> index a58cebd01d35..1ad9f7edfcc7 100644
> --- a/drivers/gpu/drm/mediatek/mtk_drm_drv.h
> +++ b/drivers/gpu/drm/mediatek/mtk_drm_drv.h
> @@ -51,6 +51,7 @@ extern struct platform_driver mtk_disp_ccorr_driver;
>  extern struct platform_driver mtk_disp_color_driver;
>  extern struct platform_driver mtk_disp_gamma_driver;
>  extern struct platform_driver mtk_disp_merge_driver;
> +extern struct platform_driver mtk_disp_ovl_adaptor_driver;
>  extern struct platform_driver mtk_disp_ovl_driver;
>  extern struct platform_driver mtk_disp_rdma_driver;
>  extern struct platform_driver mtk_dpi_driver;
> --
> 2.18.0
>




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