rockchip/mpp/mpp_vepu1.c

// SPDX-License-Identifier: (GPL-2.0+ OR MIT)
/*
 * Copyright (c) 2019 Fuzhou Rockchip Electronics Co., Ltd
 *
 * author:
 *    Alpha Lin, alpha.lin@rock-chips.com
 *    Randy Li, randy.li@rock-chips.com
 *    Ding Wei, leo.ding@rock-chips.com
 *
 */
#include <asm/cacheflush.h>
#include <linux/delay.h>
#include <linux/iopoll.h>
#include <linux/interrupt.h>
#include <linux/module.h>
#include <linux/types.h>
#include <linux/of_platform.h>
#include <linux/slab.h>
#include <linux/seq_file.h>
#include <linux/uaccess.h>
#include <linux/regmap.h>
#include <linux/proc_fs.h>
#include <linux/nospec.h>
#include <soc/rockchip/pm_domains.h>

#include "mpp_debug.h"
#include "mpp_common.h"
#include "mpp_iommu.h"

#define VEPU1_DRIVER_NAME "mpp_vepu1"

#define VEPU1_SESSION_MAX_BUFFERS 20
/* The maximum registers number of all the version */
#define VEPU1_REG_NUM 164
#define VEPU1_REG_HW_ID_INDEX 0
#define VEPU1_REG_START_INDEX 0
#define VEPU1_REG_END_INDEX 163

#define VEPU1_REG_INT 0x004
#define VEPU1_REG_INT_INDEX (1)
#define VEPU1_INT_SLICE BIT(8)
#define VEPU1_INT_TIMEOUT BIT(6)
#define VEPU1_INT_BUF_FULL BIT(5)
#define VEPU1_INT_RESET BIT(4)
#define VEPU1_INT_BUS_ERROR BIT(3)
#define VEPU1_INT_RDY BIT(2)
#define VEPU1_IRQ_DIS BIT(1)
#define VEPU1_INT_RAW BIT(0)

#define VEPU1_REG_ENC_EN 0x038
#define VEPU1_REG_ENC_EN_INDEX (14)
#define VEPU1_INT_TIMEOUT_EN BIT(31)
#define VEPU1_INT_SLICE_EN BIT(28)
#define VEPU1_ENC_START BIT(0)

#define VEPU1_GET_FORMAT(x) (((x) >> 1) & 0x3)
#define VEPU1_FORMAT_MASK (0x06)

#define VEPU1_FMT_RESERVED (0)
#define VEPU1_FMT_VP8E (1)
#define VEPU1_FMT_JPEGE (2)
#define VEPU1_FMT_H264E (3)

#define VEPU1_REG_CLR_CACHE_BASE 0xc10

#define to_vepu_task(task) container_of(task, struct vepu_task, mpp_task)
#define to_vepu_dev(dev) container_of(dev, struct vepu_dev, mpp)

struct vepu_task {
    struct mpp_task mpp_task;

    enum MPP_CLOCK_MODE clk_mode;
    u32 reg[VEPU1_REG_NUM];

    struct reg_offset_info off_inf;
    u32 irq_status;
    /* req for current task */
    u32 w_req_cnt;
    struct mpp_request w_reqs[MPP_MAX_MSG_NUM];
    u32 r_req_cnt;
    struct mpp_request r_reqs[MPP_MAX_MSG_NUM];
};

struct vepu_session_priv {
    struct rw_semaphore rw_sem;
    /* codec info from user */
    struct {
        /* show mode */
        u32 flag;
        /* item data */
        u64 val;
    } codec_info[ENC_INFO_BUTT];
};

struct vepu_dev {
    struct mpp_dev mpp;

    struct mpp_clk_info aclk_info;
    struct mpp_clk_info hclk_info;
#ifdef CONFIG_ROCKCHIP_MPP_PROC_FS
    struct proc_dir_entry *procfs;
#endif
    struct reset_control *rst_a;
    struct reset_control *rst_h;
};

static struct mpp_hw_info vepu_v1_hw_info = {
    .reg_num = VEPU1_REG_NUM,
    .reg_id = VEPU1_REG_HW_ID_INDEX,
    .reg_start = VEPU1_REG_START_INDEX,
    .reg_end = VEPU1_REG_END_INDEX,
    .reg_en = VEPU1_REG_ENC_EN_INDEX,
};

/*
 * file handle translate information
 */
static const u16 trans_tbl_default[] = {5, 6, 7, 8, 9, 10, 11, 12, 13, 51};

static const u16 trans_tbl_vp8e[] = {5, 6, 7, 8, 9, 10, 11, 12, 13, 16, 17, 26, 51, 52, 58, 59, 71};

static struct mpp_trans_info trans_rk_vepu1[] = {
    [VEPU1_FMT_RESERVED] =
        {
            .count = 0,
            .table = NULL,
        },
    [VEPU1_FMT_VP8E] =
        {
            .count = ARRAY_SIZE(trans_tbl_vp8e),
            .table = trans_tbl_vp8e,
        },
    [VEPU1_FMT_JPEGE] =
        {
            .count = ARRAY_SIZE(trans_tbl_default),
            .table = trans_tbl_default,
        },
    [VEPU1_FMT_H264E] =
        {
            .count = ARRAY_SIZE(trans_tbl_default),
            .table = trans_tbl_default,
        },
};

static int vepu_process_reg_fd(struct mpp_session *session, struct vepu_task *task, struct mpp_task_msgs *msgs)
{
    int ret = 0;
    int fmt = VEPU1_GET_FORMAT(task->reg[VEPU1_REG_ENC_EN_INDEX]);
    ret = mpp_translate_reg_address(session, &task->mpp_task, fmt, task->reg, &task->off_inf);
    if (ret) {
        return ret;
    }
    mpp_translate_reg_offset_info(&task->mpp_task, &task->off_inf, task->reg);
    return 0;
}

static int vepu_extract_task_msg(struct vepu_task *task, struct mpp_task_msgs *msgs)
{
    u32 i;
    int ret;
    struct mpp_request *req;
    struct mpp_hw_info *hw_info = task->mpp_task.hw_info;
    for (i = 0; i < msgs->req_cnt; i++) {
        u32 off_s, off_e;
        req = &msgs->reqs[i];
        if (!req->size) {
            continue;
        }
        switch (req->cmd) {
            case MPP_CMD_SET_REG_WRITE: {
                off_s = hw_info->reg_start * sizeof(u32);
                off_e = hw_info->reg_end * sizeof(u32);
                ret = mpp_check_req(req, 0, sizeof(task->reg), off_s, off_e);
                if (ret) {
                    continue;
                }
                if (copy_from_user((u8 *)task->reg + req->offset, req->data, req->size)) {
                    mpp_err("copy_from_user reg failed\n");
                    return -EIO;
                }
                memcpy(&task->w_reqs[task->w_req_cnt++], req, sizeof(*req));
                break;
            }
            case MPP_CMD_SET_REG_READ: {
                off_s = hw_info->reg_start * sizeof(u32);
                off_e = hw_info->reg_end * sizeof(u32);
                ret = mpp_check_req(req, 0, sizeof(task->reg), off_s, off_e);
                if (ret) {
                    continue;
                }
                memcpy(&task->r_reqs[task->r_req_cnt++], req, sizeof(*req));
                break;
            }
            case MPP_CMD_SET_REG_ADDR_OFFSET: {
                mpp_extract_reg_offset_info(&task->off_inf, req);
                break;
            }
            default:
                break;
        }
    }
    mpp_debug(DEBUG_TASK_INFO, "w_req_cnt %d, r_req_cnt %d\n", task->w_req_cnt, task->r_req_cnt);
    return 0;
}

static void *vepu_alloc_task(struct mpp_session *session, struct mpp_task_msgs *msgs)
{
    int ret;
    struct mpp_task *mpp_task = NULL;
    struct vepu_task *task = NULL;
    struct mpp_dev *mpp = session->mpp;

    mpp_debug_enter();

    task = kzalloc(sizeof(*task), GFP_KERNEL);
    if (!task) {
        return NULL;
    }

    mpp_task = &task->mpp_task;
    mpp_task_init(session, mpp_task);
    mpp_task->hw_info = mpp->var->hw_info;
    mpp_task->reg = task->reg;
    /* extract reqs for current task */
    ret = vepu_extract_task_msg(task, msgs);
    if (ret) {
        goto fail;
    }
    /* process fd in register */
    if (!(msgs->flags & MPP_FLAGS_REG_FD_NO_TRANS)) {
        ret = vepu_process_reg_fd(session, task, msgs);
        if (ret) {
            goto fail;
        }
    }
    task->clk_mode = CLK_MODE_NORMAL;

    mpp_debug_leave();

    return mpp_task;

fail:
    mpp_task_dump_mem_region(mpp, mpp_task);
    mpp_task_dump_reg(mpp, mpp_task);
    mpp_task_finalize(session, mpp_task);
    kfree(task);
    return NULL;
}

static int vepu_run(struct mpp_dev *mpp, struct mpp_task *mpp_task)
{
    u32 i;
    u32 reg_en;
    struct vepu_task *task = to_vepu_task(mpp_task);

    mpp_debug_enter();

    /* clear cache */
    mpp_write_relaxed(mpp, VEPU1_REG_CLR_CACHE_BASE, 1);
    /* set registers for hardware */
    reg_en = mpp_task->hw_info->reg_en;
    /* First, flush correct encoder format */
    mpp_write_relaxed(mpp, VEPU1_REG_ENC_EN, task->reg[reg_en] & VEPU1_FORMAT_MASK);
    /* Second, flush others register */
    for (i = 0; i < task->w_req_cnt; i++) {
        struct mpp_request *req = &task->w_reqs[i];
        int s = req->offset / sizeof(u32);
        int e = s + req->size / sizeof(u32);

        mpp_write_req(mpp, task->reg, s, e, reg_en);
    }
    /* init current task */
    mpp->cur_task = mpp_task;
    /* Last, flush start registers */
    wmb();
    mpp_write(mpp, VEPU1_REG_ENC_EN, task->reg[reg_en] | VEPU1_ENC_START);

    mpp_debug_leave();

    return 0;
}

static int vepu_irq(struct mpp_dev *mpp)
{
    mpp->irq_status = mpp_read(mpp, VEPU1_REG_INT);
    if (!(mpp->irq_status & VEPU1_INT_RAW)) {
        return IRQ_NONE;
    }

    mpp_write(mpp, VEPU1_REG_INT, 0);

    return IRQ_WAKE_THREAD;
}

static int vepu_isr(struct mpp_dev *mpp)
{
    u32 err_mask;
    struct vepu_task *task = NULL;
    struct mpp_task *mpp_task = mpp->cur_task;
    /* use a spin lock here */
    if (!mpp_task) {
        dev_err(mpp->dev, "no current task\n");
        return IRQ_HANDLED;
    }
    mpp_time_diff(mpp_task);
    mpp->cur_task = NULL;
    task = to_vepu_task(mpp_task);
    task->irq_status = mpp->irq_status;
    mpp_debug(DEBUG_IRQ_STATUS, "irq_status: %08x\n", task->irq_status);
    err_mask = VEPU1_INT_TIMEOUT | VEPU1_INT_BUF_FULL | VEPU1_INT_BUS_ERROR;
    if (err_mask & task->irq_status) {
        atomic_inc(&mpp->reset_request);
    }
    mpp_task_finish(mpp_task->session, mpp_task);
    mpp_debug_leave();
    return IRQ_HANDLED;
}

static int vepu_finish(struct mpp_dev *mpp, struct mpp_task *mpp_task)
{
    u32 i;
    u32 s, e;
    struct mpp_request *req;
    struct vepu_task *task = to_vepu_task(mpp_task);

    mpp_debug_enter();

    /* read register after running */
    for (i = 0; i < task->r_req_cnt; i++) {
        req = &task->r_reqs[i];
        s = req->offset / sizeof(u32);
        e = s + req->size / sizeof(u32);
        mpp_read_req(mpp, task->reg, s, e);
    }
    /* revert hack for irq status */
    task->reg[VEPU1_REG_INT_INDEX] = task->irq_status;

    mpp_debug_leave();

    return 0;
}

static int vepu_result(struct mpp_dev *mpp, struct mpp_task *mpp_task, struct mpp_task_msgs *msgs)
{
    u32 i;
    struct mpp_request *req;
    struct vepu_task *task = to_vepu_task(mpp_task);

    /* may overflow the kernel */
    for (i = 0; i < task->r_req_cnt; i++) {
        req = &task->r_reqs[i];

        if (copy_to_user(req->data, (u8 *)task->reg + req->offset, req->size)) {
            mpp_err("copy_to_user reg fail\n");
            return -EIO;
        }
    }
    return 0;
}

static int vepu_free_task(struct mpp_session *session, struct mpp_task *mpp_task)
{
    struct vepu_task *task = to_vepu_task(mpp_task);
    mpp_task_finalize(session, mpp_task);
    kfree(task);
    return 0;
}

static int vepu_control(struct mpp_session *session, struct mpp_request *req)
{
    switch (req->cmd) {
        case MPP_CMD_SEND_CODEC_INFO: {
            int i;
            int cnt;
            struct codec_info_elem elem;
            struct vepu_session_priv *priv;
            if (!session || !session->priv) {
                mpp_err("session info null\n");
                return -EINVAL;
            }
            priv = session->priv;
            cnt = req->size / sizeof(elem);
            cnt = (cnt > ENC_INFO_BUTT) ? ENC_INFO_BUTT : cnt;
            mpp_debug(DEBUG_IOCTL, "codec info count %d\n", cnt);
            down_write(&priv->rw_sem);
            for (i = 0; i < cnt; i++) {
                if (copy_from_user(&elem, req->data + i * sizeof(elem), sizeof(elem))) {
                    mpp_err("copy_from_user failed\n");
                    continue;
                }
                if (elem.type > ENC_INFO_BASE && elem.type < ENC_INFO_BUTT && elem.flag > CODEC_INFO_FLAG_NULL &&
                    elem.flag < CODEC_INFO_FLAG_BUTT) {
                    elem.type = array_index_nospec(elem.type, ENC_INFO_BUTT);
                    priv->codec_info[elem.type].flag = elem.flag;
                    priv->codec_info[elem.type].val = elem.data;
                } else {
                    mpp_err("codec info invalid, type %d, flag %d\n", elem.type, elem.flag);
                }
            }
            up_write(&priv->rw_sem);
            break;
        }
        default: {
            mpp_err("unknown mpp ioctl cmd %x\n", req->cmd);
            break;
        }
    }
    return 0;
}

static int vepu_free_session(struct mpp_session *session)
{
    if (session && session->priv) {
        kfree(session->priv);
        session->priv = NULL;
    }

    return 0;
}

static int vepu_init_session(struct mpp_session *session)
{
    struct vepu_session_priv *priv;

    if (!session) {
        mpp_err("session is null\n");
        return -EINVAL;
    }

    priv = kzalloc(sizeof(*priv), GFP_KERNEL);
    if (!priv) {
        return -ENOMEM;
    }

    init_rwsem(&priv->rw_sem);
    session->priv = priv;

    return 0;
}

#ifdef CONFIG_ROCKCHIP_MPP_PROC_FS
static int vepu_procfs_remove(struct mpp_dev *mpp)
{
    struct vepu_dev *enc = to_vepu_dev(mpp);

    if (enc->procfs) {
        proc_remove(enc->procfs);
        enc->procfs = NULL;
    }

    return 0;
}

static int vepu_dump_session(struct mpp_session *session, struct seq_file *seq)
{
    int i;
    struct vepu_session_priv *priv = session->priv;

    down_read(&priv->rw_sem);
    /* item name */
    seq_puts(seq, "------------------------------------------------------");
    seq_puts(seq, "------------------------------------------------------\n");
    seq_printf(seq, "|%8s|", (const char *)"session");
    seq_printf(seq, "%8s|", (const char *)"device");
    for (i = ENC_INFO_BASE; i < ENC_INFO_BUTT; i++) {
        bool show = priv->codec_info[i].flag;

        if (show) {
            seq_printf(seq, "%8s|", enc_info_item_name[i]);
        }
    }
    seq_puts(seq, "\n");
    /* item data */
    seq_printf(seq, "|%8p|", session);
    seq_printf(seq, "%8s|", mpp_device_name[session->device_type]);
    for (i = ENC_INFO_BASE; i < ENC_INFO_BUTT; i++) {
        u32 flag = priv->codec_info[i].flag;

        if (!flag) {
            continue;
        }
        if (flag == CODEC_INFO_FLAG_NUMBER) {
            u32 data = priv->codec_info[i].val;

            seq_printf(seq, "%8d|", data);
        } else if (flag == CODEC_INFO_FLAG_STRING) {
            const char *name = (const char *)&priv->codec_info[i].val;

            seq_printf(seq, "%8s|", name);
        } else {
            seq_printf(seq, "%8s|", (const char *)"null");
        }
    }
    seq_puts(seq, "\n");
    up_read(&priv->rw_sem);

    return 0;
}

static int vepu_show_session_info(struct seq_file *seq, void *offset)
{
    struct mpp_session *session = NULL, *n;
    struct mpp_dev *mpp = seq->private;

    mutex_lock(&mpp->srv->session_lock);
    list_for_each_entry_safe(session, n, &mpp->srv->session_list, session_link)
    {
        if (session->device_type != MPP_DEVICE_VEPU1) {
            continue;
        }
        if (!session->priv) {
            continue;
        }
        if (mpp->dev_ops->dump_session) {
            mpp->dev_ops->dump_session(session, seq);
        }
    }
    mutex_unlock(&mpp->srv->session_lock);

    return 0;
}

static int vepu_procfs_init(struct mpp_dev *mpp)
{
    struct vepu_dev *enc = to_vepu_dev(mpp);

    enc->procfs = proc_mkdir(mpp->dev->of_node->name, mpp->srv->procfs);
    if (IS_ERR_OR_NULL(enc->procfs)) {
        mpp_err("failed on open procfs\n");
        enc->procfs = NULL;
        return -EIO;
    }
    mpp_procfs_create_u32("aclk", FILE_RIGHT_644, enc->procfs, &enc->aclk_info.debug_rate_hz);
    mpp_procfs_create_u32("session_buffers", FILE_RIGHT_644, enc->procfs, &mpp->session_max_buffers);
    /* for show session info */
    proc_create_single_data("sessions-info", FILE_RIGHT_444, enc->procfs, vepu_show_session_info, mpp);

    return 0;
}
#else
static inline int vepu_procfs_remove(struct mpp_dev *mpp)
{
    return 0;
}

static inline int vepu_procfs_init(struct mpp_dev *mpp)
{
    return 0;
}

static inline int vepu_dump_session(struct mpp_session *session, struct seq_file *seq)
{
    return 0;
}
#endif

static int vepu_init(struct mpp_dev *mpp)
{
    int ret;
    struct vepu_dev *enc = to_vepu_dev(mpp);

    mpp->grf_info = &mpp->srv->grf_infos[MPP_DRIVER_VEPU1];

    /* Get clock info from dtsi */
    ret = mpp_get_clk_info(mpp, &enc->aclk_info, "aclk_vcodec");
    if (ret) {
        mpp_err("failed on clk_get aclk_vcodec\n");
    }
    ret = mpp_get_clk_info(mpp, &enc->hclk_info, "hclk_vcodec");
    if (ret) {
        mpp_err("failed on clk_get hclk_vcodec\n");
    }
    /* Set default rates */
    mpp_set_clk_info_rate_hz(&enc->aclk_info, CLK_MODE_DEFAULT, 0x12C * MHZ);

    /* Get reset control from dtsi */
    enc->rst_a = mpp_reset_control_get(mpp, RST_TYPE_A, "video_a");
    if (!enc->rst_a) {
        mpp_err("No aclk reset resource define\n");
    }
    enc->rst_h = mpp_reset_control_get(mpp, RST_TYPE_H, "video_h");
    if (!enc->rst_h) {
        mpp_err("No hclk reset resource define\n");
    }

    return 0;
}

static int vepu_clk_on(struct mpp_dev *mpp)
{
    struct vepu_dev *enc = to_vepu_dev(mpp);

    mpp_clk_safe_enable(enc->aclk_info.clk);
    mpp_clk_safe_enable(enc->hclk_info.clk);

    return 0;
}

static int vepu_clk_off(struct mpp_dev *mpp)
{
    struct vepu_dev *enc = to_vepu_dev(mpp);

    mpp_clk_safe_disable(enc->aclk_info.clk);
    mpp_clk_safe_disable(enc->hclk_info.clk);

    return 0;
}

static int vepu_set_freq(struct mpp_dev *mpp, struct mpp_task *mpp_task)
{
    struct vepu_dev *enc = to_vepu_dev(mpp);
    struct vepu_task *task = to_vepu_task(mpp_task);

    mpp_clk_set_rate(&enc->aclk_info, task->clk_mode);

    return 0;
}

static int vepu_reduce_freq(struct mpp_dev *mpp)
{
    struct vepu_dev *enc = to_vepu_dev(mpp);

    mpp_clk_set_rate(&enc->aclk_info, CLK_MODE_REDUCE);

    return 0;
}

static int vepu_reset(struct mpp_dev *mpp)
{
    struct vepu_dev *enc = to_vepu_dev(mpp);

    if (enc->rst_a && enc->rst_h) {
        /* Don't skip this or iommu won't work after reset */
        rockchip_pmu_idle_request(mpp->dev, true);
        mpp_safe_reset(enc->rst_a);
        mpp_safe_reset(enc->rst_h);
        udelay(0x5);
        mpp_safe_unreset(enc->rst_a);
        mpp_safe_unreset(enc->rst_h);
        rockchip_pmu_idle_request(mpp->dev, false);
    }
    mpp_write(mpp, VEPU1_REG_ENC_EN, 0);

    return 0;
}

static struct mpp_hw_ops vepu_v1_hw_ops = {
    .init = vepu_init,
    .clk_on = vepu_clk_on,
    .clk_off = vepu_clk_off,
    .set_freq = vepu_set_freq,
    .reduce_freq = vepu_reduce_freq,
    .reset = vepu_reset,
};

static struct mpp_dev_ops vepu_v1_dev_ops = {
    .alloc_task = vepu_alloc_task,
    .run = vepu_run,
    .irq = vepu_irq,
    .isr = vepu_isr,
    .finish = vepu_finish,
    .result = vepu_result,
    .free_task = vepu_free_task,
    .ioctl = vepu_control,
    .init_session = vepu_init_session,
    .free_session = vepu_free_session,
    .dump_session = vepu_dump_session,
};

static const struct mpp_dev_var vepu_v1_data = {
    .device_type = MPP_DEVICE_VEPU1,
    .hw_info = &vepu_v1_hw_info,
    .trans_info = trans_rk_vepu1,
    .hw_ops = &vepu_v1_hw_ops,
    .dev_ops = &vepu_v1_dev_ops,
};

static const struct of_device_id mpp_vepu1_dt_match[] = {
    {
        .compatible = "rockchip,vpu-encoder-v1",
        .data = &vepu_v1_data,
    },
    {},
};

static int vepu_probe(struct platform_device *pdev)
{
    int ret = 0;
    struct device *dev = &pdev->dev;
    struct vepu_dev *enc = NULL;
    struct mpp_dev *mpp = NULL;
    const struct of_device_id *match = NULL;

    dev_info(dev, "probe device\n");
    enc = devm_kzalloc(dev, sizeof(struct vepu_dev), GFP_KERNEL);
    if (!enc) {
        return -ENOMEM;
    }

    mpp = &enc->mpp;
    platform_set_drvdata(pdev, enc);

    if (pdev->dev.of_node) {
        match = of_match_node(mpp_vepu1_dt_match, pdev->dev.of_node);
        if (match) {
            mpp->var = (struct mpp_dev_var *)match->data;
        }
    }

    ret = mpp_dev_probe(mpp, pdev);
    if (ret) {
        dev_err(dev, "probe sub driver failed\n");
        return -EINVAL;
    }

    ret = devm_request_threaded_irq(dev, mpp->irq, mpp_dev_irq, mpp_dev_isr_sched, IRQF_SHARED, dev_name(dev), mpp);
    if (ret) {
        dev_err(dev, "register interrupter runtime failed\n");
        return -EINVAL;
    }

    mpp->session_max_buffers = VEPU1_SESSION_MAX_BUFFERS;
    vepu_procfs_init(mpp);
    /* register current device to mpp service */
    mpp_dev_register_srv(mpp, mpp->srv);
    dev_info(dev, "probing finish\n");

    return 0;
}

static int vepu_remove(struct platform_device *pdev)
{
    struct device *dev = &pdev->dev;
    struct vepu_dev *enc = platform_get_drvdata(pdev);

    dev_info(dev, "remove device\n");
    mpp_dev_remove(&enc->mpp);
    vepu_procfs_remove(&enc->mpp);

    return 0;
}

static void vepu_shutdown(struct platform_device *pdev)
{
    int ret;
    int val;
    struct device *dev = &pdev->dev;
    struct vepu_dev *enc = platform_get_drvdata(pdev);
    struct mpp_dev *mpp = &enc->mpp;

    dev_info(dev, "shutdown device\n");

    atomic_inc(&mpp->srv->shutdown_request);
    ret = readx_poll_timeout(atomic_read, &mpp->task_count, val, val == 0, 0x4E20, 0x30D40);
    if (ret == -ETIMEDOUT) {
        dev_err(dev, "wait total running time out\n");
    }
}

struct platform_driver rockchip_vepu1_driver = {
    .probe = vepu_probe,
    .remove = vepu_remove,
    .shutdown = vepu_shutdown,
    .driver =
        {
            .name = VEPU1_DRIVER_NAME,
            .of_match_table = of_match_ptr(mpp_vepu1_dt_match),
        },
};
EXPORT_SYMBOL(rockchip_vepu1_driver);