// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * linux/drivers/media/platform/samsung/s5p-mfc/s5p_mfc_pm.c
 *
 * Copyright (c) 2010 Samsung Electronics Co., Ltd.
 *              http://www.samsung.com/
 */

#include <linux/clk.h>
#include <linux/err.h>
#include <linux/platform_device.h>
#include <linux/pm_runtime.h>
#include "s5p_mfc_common.h"
#include "s5p_mfc_debug.h"
#include "s5p_mfc_pm.h"

int s5p_mfc_init_pm(struct s5p_mfc_dev *dev)
{
        struct s5p_mfc_pm *pm = &dev->pm;
        int i;

        pm->num_clocks = dev->variant->num_clocks;
        pm->clk_names = dev->variant->clk_names;
        pm->device = &dev->plat_dev->dev;
        pm->clock_gate = NULL;

        /* clock control */
        for (i = 0; i < pm->num_clocks; i++) {
                pm->clocks[i] = devm_clk_get(pm->device, pm->clk_names[i]);
                if (IS_ERR(pm->clocks[i])) {
                        /* additional clocks are optional */
                        if (i && PTR_ERR(pm->clocks[i]) == -ENOENT) {
                                pm->clocks[i] = NULL;
                                continue;
                        }
                        mfc_err("Failed to get clock: %s\n",
                                pm->clk_names[i]);
                        return PTR_ERR(pm->clocks[i]);
                }
        }

        if (dev->variant->use_clock_gating)
                pm->clock_gate = pm->clocks[0];

        pm_runtime_enable(pm->device);
        return 0;
}

void s5p_mfc_final_pm(struct s5p_mfc_dev *dev)
{
        pm_runtime_disable(dev->pm.device);
}

int s5p_mfc_clock_on(struct s5p_mfc_dev *dev)
{
        return clk_enable(dev->pm.clock_gate);
}

void s5p_mfc_clock_off(struct s5p_mfc_dev *dev)
{
        clk_disable(dev->pm.clock_gate);
}

int s5p_mfc_power_on(struct s5p_mfc_dev *dev)
{
        int i, ret = 0;

        ret = pm_runtime_resume_and_get(dev->pm.device);
        if (ret < 0)
                return ret;

        /* clock control */
        for (i = 0; i < dev->pm.num_clocks; i++) {
                ret = clk_prepare_enable(dev->pm.clocks[i]);
                if (ret < 0) {
                        mfc_err("clock prepare failed for clock: %s\n",
                                dev->pm.clk_names[i]);
                        goto err;
                }
        }

        /* prepare for software clock gating */
        clk_disable(dev->pm.clock_gate);

        return 0;
err:
        while (--i >= 0)
                clk_disable_unprepare(dev->pm.clocks[i]);
        pm_runtime_put(dev->pm.device);
        return ret;
}

int s5p_mfc_power_off(struct s5p_mfc_dev *dev)
{
        int i;

        /* finish software clock gating */
        clk_enable(dev->pm.clock_gate);

        for (i = 0; i < dev->pm.num_clocks; i++)
                clk_disable_unprepare(dev->pm.clocks[i]);

        return pm_runtime_put_sync(dev->pm.device);
}