Re: [PATCH v26 3/7] drm/mediatek: add ovl_adaptor support for MT8195

From: Nancy Lin (林欣螢)
Date: Wed Nov 02 2022 - 22:48:07 EST

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Hi Guillaume,

Sorry for the late response and thanks for testing.

On Fri, 2022-08-19 at 02:10 -0700, Guillaume Ranquet wrote:
> On Fri, 19 Aug 2022 08:14, "" wrote:
> > 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.
> >
>
> Hi Nancy, sorry I'm late in the review process, but I just applied
> your series and I stumbled upon a panic.
> (see details inline)
>
> This is due to the fact that my dts is missing the required ovl
> components, though, I think the driver
> shouldn't cause a panic whenever the dts is not complete.
>
> I'm testing this out with an mt8195-demo board.
>
> > Signed-off-by: Nancy.Lin <nancy.lin@xxxxxxxxxxxx>
> > Reviewed-by: Chun-Kuang Hu <chunkuang.hu@xxxxxxxxxx>
> > Reviewed-by: AngeloGioacchino Del Regno <
> > angelogioacchino.delregno@xxxxxxxxxxxxx>
> > Tested-by: AngeloGioacchino Del Regno <
> > angelogioacchino.delregno@xxxxxxxxxxxxx>
> > Tested-by: Bo-Chen Chen <rex-bc.chen@xxxxxxxxxxxx>
> > ---
> > drivers/gpu/drm/mediatek/Makefile | 1 +
> > drivers/gpu/drm/mediatek/mtk_disp_drv.h | 26 +
> > .../gpu/drm/mediatek/mtk_disp_ovl_adaptor.c | 528
> > ++++++++++++++++++
> > drivers/gpu/drm/mediatek/mtk_drm_drv.h | 1 +
> > 4 files changed, 556 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 33e61a136bbc..654f8e257984 100644
> > --- a/drivers/gpu/drm/mediatek/mtk_disp_drv.h
> > +++ b/drivers/gpu/drm/mediatek/mtk_disp_drv.h
> > @@ -7,6 +7,8 @@
> > #define _MTK_DISP_DRV_H_
> >
> > #include <linux/soc/mediatek/mtk-cmdq.h>
> > +#include <linux/soc/mediatek/mtk-mmsys.h>
> > +#include <linux/soc/mediatek/mtk-mutex.h>
> > #include "mtk_drm_plane.h"
> > #include "mtk_mdp_rdma.h"
> >
> > @@ -116,6 +118,30 @@ void mtk_rdma_unregister_vblank_cb(struct
> > device *dev);
> > void mtk_rdma_enable_vblank(struct device *dev);
> > void mtk_rdma_disable_vblank(struct device *dev);
> >
> > +void mtk_ovl_adaptor_add_comp(struct device *dev, struct mtk_mutex
> > *mutex);
> > +void mtk_ovl_adaptor_remove_comp(struct device *dev, struct
> > mtk_mutex *mutex);
> > +void mtk_ovl_adaptor_connect(struct device *dev, struct device
> > *mmsys_dev,
> > + unsigned int next);
> > +void mtk_ovl_adaptor_disconnect(struct device *dev, struct device
> > *mmsys_dev,
> > + unsigned int next);
> > +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_register_vblank_cb(struct device *dev, void
> > (*vblank_cb)(void *),
> > + void *vblank_cb_data);
> > +void mtk_ovl_adaptor_unregister_vblank_cb(struct device *dev);
> > +void mtk_ovl_adaptor_enable_vblank(struct device *dev);
> > +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);
> > +struct device *mtk_ovl_adaptor_dma_dev_get(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..267ee0a1b8fa
> > --- /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 <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-cmdq.h>
> > +#include <linux/soc/mediatek/mtk-mmsys.h>
> > +#include <linux/soc/mediatek/mtk-mutex.h>
> > +
> > +#include "mtk_disp_drv.h"
> > +#include "mtk_drm_crtc.h"
> > +#include "mtk_drm_ddp_comp.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_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;
> > + bool children_bound;
> > +};
> > +
> > +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 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) {
> > + 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)
> > +{
> > + 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);
> > +
> > + 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 = 0; i < OVL_ADAPTOR_MERGE0; i++) {
> > + comp = ovl_adaptor->ovl_adaptor_comp[i];
> > + ret = pm_runtime_get_sync(comp);
> > + if (ret < 0) {
> > + dev_err(dev, "Failed to enable power domain %d,
> > err %d\n", i, ret);
> > + goto pwr_err;
> > + }
> > + }
> > +
> > + 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\n", i, ret);
> > + 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);
> > + }
> > + i = OVL_ADAPTOR_MERGE0;
> > +
> > +pwr_err:
> > + while (--i >= 0)
> > + pm_runtime_put(ovl_adaptor->ovl_adaptor_comp[i]);
> > +
> > + 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 = 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);
> > + pm_runtime_put(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;
> > +}
> > +
> > +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]);
> > +}
> > +
> > +void mtk_ovl_adaptor_add_comp(struct device *dev, struct mtk_mutex
> > *mutex)
> > +{
> > + mtk_mutex_add_comp(mutex, DDP_COMPONENT_MDP_RDMA0);
> > + mtk_mutex_add_comp(mutex, DDP_COMPONENT_MDP_RDMA1);
> > + mtk_mutex_add_comp(mutex, DDP_COMPONENT_MDP_RDMA2);
> > + mtk_mutex_add_comp(mutex, DDP_COMPONENT_MDP_RDMA3);
> > + mtk_mutex_add_comp(mutex, DDP_COMPONENT_MDP_RDMA4);
> > + mtk_mutex_add_comp(mutex, DDP_COMPONENT_MDP_RDMA5);
> > + mtk_mutex_add_comp(mutex, DDP_COMPONENT_MDP_RDMA6);
> > + mtk_mutex_add_comp(mutex, DDP_COMPONENT_MDP_RDMA7);
> > + mtk_mutex_add_comp(mutex, DDP_COMPONENT_MERGE1);
> > + mtk_mutex_add_comp(mutex, DDP_COMPONENT_MERGE2);
> > + mtk_mutex_add_comp(mutex, DDP_COMPONENT_MERGE3);
> > + mtk_mutex_add_comp(mutex, DDP_COMPONENT_MERGE4);
> > + mtk_mutex_add_comp(mutex, DDP_COMPONENT_ETHDR_MIXER);
> > +}
> > +
> > +void mtk_ovl_adaptor_remove_comp(struct device *dev, struct
> > mtk_mutex *mutex)
> > +{
> > + mtk_mutex_remove_comp(mutex, DDP_COMPONENT_MDP_RDMA0);
> > + mtk_mutex_remove_comp(mutex, DDP_COMPONENT_MDP_RDMA1);
> > + mtk_mutex_remove_comp(mutex, DDP_COMPONENT_MDP_RDMA2);
> > + mtk_mutex_remove_comp(mutex, DDP_COMPONENT_MDP_RDMA3);
> > + mtk_mutex_remove_comp(mutex, DDP_COMPONENT_MDP_RDMA4);
> > + mtk_mutex_remove_comp(mutex, DDP_COMPONENT_MDP_RDMA5);
> > + mtk_mutex_remove_comp(mutex, DDP_COMPONENT_MDP_RDMA6);
> > + mtk_mutex_remove_comp(mutex, DDP_COMPONENT_MDP_RDMA7);
> > + mtk_mutex_remove_comp(mutex, DDP_COMPONENT_MERGE1);
> > + mtk_mutex_remove_comp(mutex, DDP_COMPONENT_MERGE2);
> > + mtk_mutex_remove_comp(mutex, DDP_COMPONENT_MERGE3);
> > + mtk_mutex_remove_comp(mutex, DDP_COMPONENT_MERGE4);
> > + mtk_mutex_remove_comp(mutex, DDP_COMPONENT_ETHDR_MIXER);
> > +}
> > +
> > +void mtk_ovl_adaptor_connect(struct device *dev, struct device
> > *mmsys_dev, unsigned int 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);
> > + mtk_mmsys_ddp_connect(mmsys_dev, DDP_COMPONENT_ETHDR_MIXER,
> > next);
> > +}
> > +
> > +void mtk_ovl_adaptor_disconnect(struct device *dev, struct device
> > *mmsys_dev, unsigned int 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);
> > + mtk_mmsys_ddp_disconnect(mmsys_dev, DDP_COMPONENT_ETHDR_MIXER,
> > next);
> > +}
> > +
> > +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,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;
> > +
> > + 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_dbg(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)
> > + return -EPROBE_DEFER;
> > +
> > + priv->ovl_adaptor_comp[id] = &comp_pdev->dev;
> > +
> > + drm_of_component_match_add(dev, match, compare_of,
> > node);
> > + dev_dbg(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)
> > +{
> > + 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);
>
> Here the code assumes match is not NULL and that
> ovl_adaptor_comp_init() allocated it
> with a call to drm_of_component_match_add() which never happens in
> case of a buggy dts.
> IMHO, ovl_adaptor_comp_init() should return an error in case no
> components have been found.
>
> [ 0.936986] mediatek-disp-ovl-adaptor
> mediatek-disp-ovl-adaptor.2.auto: Failed to get id. type: 1, alias:
> -19
> [ 0.938238] mediatek-disp-ovl-adaptor
> mediatek-disp-ovl-adaptor.2.auto: Skipping unknown component
> /soc/merge@1c014000
> [ 0.939596] Unable to handle kernel NULL pointer dereference at
> virtual address 0000000000000000
> [ 0.940701] Mem abort info:
> [ 0.941064] ESR = 0x0000000096000004
> [ 0.941538] EC = 0x25: DABT (current EL), IL = 32 bits
> [ 0.942208] SET = 0, FnV = 0
> [ 0.942595] EA = 0, S1PTW = 0
> [ 0.942993] FSC = 0x04: level 0 translation fault
> [ 0.943607] Data abort info:
> [ 0.943972] ISV = 0, ISS = 0x00000004
> [ 0.944455] CM = 0, WnR = 0
> [ 0.944835] [0000000000000000] user address but active_mm is
> swapper
> [ 0.945636] Internal error: Oops: 96000004 [#1] PREEMPT SMP
> [ 0.946340] CPU: 6 PID: 1 Comm: swapper/0 Not tainted
> 6.0.0-rc1-next-20220818-mtk #17
> [ 0.947327] swapper/0[1] cmdline: b
> [ 0.947327]
> [ 0.947976] Hardware name: MediaTek MT8195 demo board (DT)
> [ 0.948666] pstate: 20400009 (nzCv daif +PAN -UAO -TCO -DIT -SSBS
> BTYPE=--)
> [ 0.949545] pc : component_master_add_with_match+0x24/0x100
> [ 0.950257] lr : mtk_disp_ovl_adaptor_probe+0x1d0/0x280
> [ 0.950925] sp : ffff80000a62b720
> [ 0.951344] x29: ffff80000a62b720 x28: 0000000000000000 x27:
> ffff0000048dac10
> [ 0.952248] x26: ffff00007fbbdda0 x25: 0000000000000001 x24:
> 0000000000000000
> [ 0.953149] x23: ffff0000048dac00 x22: ffff8000097e29d0 x21:
> ffff0000048dac10
> [ 0.954050] x20: 0000000000000000 x19: 0000000000000000 x18:
> ffffffffffffffff
> [ 0.954951] x17: 70696b53203a6f74 x16: 75612e322e726f74 x15:
> 0720072007200720
> [ 0.955852] x14: 0720072007200720 x13: ffff80000a3787e0 x12:
> 00000000000002af
> [ 0.956752] x11: 00000000000000e5 x10: ffff84000bfe5dc8 x9 :
> 0000000000000002
> [ 0.957653] x8 : 0101010101010101 x7 : 7f7f7f7f7f7f7f7f x6 :
> 01fefefefefefeff
> [ 0.958553] x5 : 0000000000000014 x4 : 0000000000000000 x3 :
> ffff0000048db000
> [ 0.959453] x2 : 0000000000000000 x1 : ffff8000097e29d0 x0 :
> ffff0000048dac10
> [ 0.960354] Call trace:
> [ 0.960664] component_master_add_with_match+0x24/0x100
> [ 0.961326] mtk_disp_ovl_adaptor_probe+0x1d0/0x280
> [ 0.961945] platform_probe+0x6c/0xe0
> [ 0.962411] really_probe+0xbc/0x2d4
> [ 0.962864] __driver_probe_device+0x78/0xe0
> [ 0.963404] driver_probe_device+0x40/0x12c
> [ 0.963933] __device_attach_driver+0xec/0x154
> [ 0.964496] bus_for_each_drv+0x78/0xd0
> [ 0.964982] __device_attach+0xa8/0x1c0
> [ 0.965467] device_initial_probe+0x18/0x2c
> [ 0.965997] bus_probe_device+0x9c/0xa4
> [ 0.966482] device_add+0x384/0x870
> [ 0.966927] platform_device_add+0x118/0x23c
> [ 0.967470] platform_device_register_full+0x104/0x18c
> [ 0.968120] mtk_drm_probe+0x31c/0x440
> [ 0.968596] platform_probe+0x6c/0xe0
> [ 0.969061] really_probe+0xbc/0x2d4
> [ 0.969515] __driver_probe_device+0x78/0xe0
> [ 0.970055] driver_probe_device+0x40/0x12c
> [ 0.970584] __driver_attach+0x120/0x1d0
> [ 0.971080] bus_for_each_dev+0x70/0xcc
> [ 0.971569] driver_attach+0x28/0x34
> [ 0.972022] bus_add_driver+0x148/0x200
> [ 0.972507] driver_register+0x7c/0x13c
> [ 0.972993] __platform_register_drivers+0x54/0xdc
> [ 0.973600] mtk_drm_init+0x24/0x30
> [ 0.974044] do_one_initcall+0x6c/0x148
> [ 0.974530] kernel_init_freeable+0x208/0x288
> [ 0.975080] kernel_init+0x28/0x130
> [ 0.975526] ret_from_fork+0x10/0x20
> [ 0.975984] Code: aa0203f4 a9025bf5 aa0003f5 aa0103f6 (a9400440)
> [ 0.976753] ---[ end trace 0000000000000000 ]---
> [ 0.977347] Kernel panic - not syncing: Attempted to kill init!
> exitcode=0x0000000b
> [ 0.978311] SMP: stopping secondary CPUs
> [ 0.978811] Kernel Offset: disabled
> [ 0.979252] CPU features: 0x2000,0001c029,19801c82
> [ 0.979856] Memory Limit: none
> [ 0.980243] ---[ end Kernel panic - not syncing: Attempted to kill
> init! exitcode=0x0000000b ]---
>
>
> Thx,
> Guillaume.

I will add an error return code if no component is found.

Thanks,
Nancy

> > + 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);
> > + }
> > +
> > + return ret;
> > +}
> > +
> > +static int 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);
> > + 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 3b393e4b364a..51bee36579ef 100644
> > --- a/drivers/gpu/drm/mediatek/mtk_drm_drv.h
> > +++ b/drivers/gpu/drm/mediatek/mtk_drm_drv.h
> > @@ -57,6 +57,7 @@ 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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