2874c5fd28
Based on 1 normalized pattern(s): this program is free software you can redistribute it and or modify it under the terms of the gnu general public license as published by the free software foundation either version 2 of the license or at your option any later version extracted by the scancode license scanner the SPDX license identifier GPL-2.0-or-later has been chosen to replace the boilerplate/reference in 3029 file(s). Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Allison Randal <allison@lohutok.net> Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190527070032.746973796@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
114 lines
2.2 KiB
C
114 lines
2.2 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* linux/drivers/media/platform/s5p-mfc/s5p_mfc_pm.c
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*
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* Copyright (c) 2010 Samsung Electronics Co., Ltd.
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* http://www.samsung.com/
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*/
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#include <linux/clk.h>
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#include <linux/err.h>
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#include <linux/platform_device.h>
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#include <linux/pm_runtime.h>
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#include "s5p_mfc_common.h"
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#include "s5p_mfc_debug.h"
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#include "s5p_mfc_pm.h"
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static struct s5p_mfc_pm *pm;
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static struct s5p_mfc_dev *p_dev;
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static atomic_t clk_ref;
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int s5p_mfc_init_pm(struct s5p_mfc_dev *dev)
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{
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int i;
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pm = &dev->pm;
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p_dev = dev;
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pm->num_clocks = dev->variant->num_clocks;
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pm->clk_names = dev->variant->clk_names;
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pm->device = &dev->plat_dev->dev;
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pm->clock_gate = NULL;
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/* clock control */
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for (i = 0; i < pm->num_clocks; i++) {
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pm->clocks[i] = devm_clk_get(pm->device, pm->clk_names[i]);
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if (IS_ERR(pm->clocks[i])) {
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mfc_err("Failed to get clock: %s\n",
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pm->clk_names[i]);
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return PTR_ERR(pm->clocks[i]);
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}
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}
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if (dev->variant->use_clock_gating)
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pm->clock_gate = pm->clocks[0];
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pm_runtime_enable(pm->device);
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atomic_set(&clk_ref, 0);
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return 0;
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}
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void s5p_mfc_final_pm(struct s5p_mfc_dev *dev)
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{
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pm_runtime_disable(pm->device);
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}
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int s5p_mfc_clock_on(void)
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{
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atomic_inc(&clk_ref);
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mfc_debug(3, "+ %d\n", atomic_read(&clk_ref));
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return clk_enable(pm->clock_gate);
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}
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void s5p_mfc_clock_off(void)
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{
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atomic_dec(&clk_ref);
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mfc_debug(3, "- %d\n", atomic_read(&clk_ref));
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clk_disable(pm->clock_gate);
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}
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int s5p_mfc_power_on(void)
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{
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int i, ret = 0;
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ret = pm_runtime_get_sync(pm->device);
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if (ret < 0)
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return ret;
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/* clock control */
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for (i = 0; i < pm->num_clocks; i++) {
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ret = clk_prepare_enable(pm->clocks[i]);
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if (ret < 0) {
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mfc_err("clock prepare failed for clock: %s\n",
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pm->clk_names[i]);
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i++;
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goto err;
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}
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}
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/* prepare for software clock gating */
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clk_disable(pm->clock_gate);
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return 0;
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err:
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while (--i > 0)
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clk_disable_unprepare(pm->clocks[i]);
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pm_runtime_put(pm->device);
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return ret;
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}
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int s5p_mfc_power_off(void)
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{
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int i;
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/* finish software clock gating */
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clk_enable(pm->clock_gate);
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for (i = 0; i < pm->num_clocks; i++)
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clk_disable_unprepare(pm->clocks[i]);
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return pm_runtime_put_sync(pm->device);
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}
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