mirror of
https://github.com/rd-stuffs/msm-4.14.git
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d19f405a5a
fc906b6d "Remove special clock usage in driver" removed initialization of MFC special clock, arguing that there's no need to do it explicitly, since it's one of MFC gate clock's dependencies and gets enabled along with it. However, there's no promise of keeping this hierarchy across Exynos SoC releases, therefore this approach fails to provide a stable, portable solution. Out of all MFC versions, only v6 doesn't use special clock at all. For other versions log a message only in case clk_get fails, as not all the devices with the same MFC version require initializing the clock explicitly. Signed-off-by: Mateusz Zalega <m.zalega@samsung.com> Signed-off-by: Seung-Woo Kim <sw0312.kim@samsung.com> Signed-off-by: Jacek Anaszewski <j.anaszewski@samsung.com> Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com> Signed-off-by: Kamil Debski <k.debski@samsung.com> Signed-off-by: Mauro Carvalho Chehab <m.chehab@samsung.com>
142 lines
2.8 KiB
C
142 lines
2.8 KiB
C
/*
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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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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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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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#ifdef CONFIG_PM_RUNTIME
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#include <linux/pm_runtime.h>
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#endif
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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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#define MFC_GATE_CLK_NAME "mfc"
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#define MFC_SCLK_NAME "sclk-mfc"
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#define MFC_SCLK_RATE (200 * 1000000)
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#define CLK_DEBUG
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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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#ifdef CLK_DEBUG
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static atomic_t clk_ref;
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#endif
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int s5p_mfc_init_pm(struct s5p_mfc_dev *dev)
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{
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int ret = 0;
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pm = &dev->pm;
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p_dev = dev;
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pm->clock_gate = clk_get(&dev->plat_dev->dev, MFC_GATE_CLK_NAME);
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if (IS_ERR(pm->clock_gate)) {
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mfc_err("Failed to get clock-gating control\n");
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ret = PTR_ERR(pm->clock_gate);
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goto err_g_ip_clk;
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}
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ret = clk_prepare(pm->clock_gate);
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if (ret) {
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mfc_err("Failed to prepare clock-gating control\n");
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goto err_p_ip_clk;
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}
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if (dev->variant->version != MFC_VERSION_V6) {
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pm->clock = clk_get(&dev->plat_dev->dev, MFC_SCLK_NAME);
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if (IS_ERR(pm->clock)) {
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mfc_info("Failed to get MFC special clock control\n");
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} else {
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clk_set_rate(pm->clock, MFC_SCLK_RATE);
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ret = clk_prepare_enable(pm->clock);
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if (ret) {
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mfc_err("Failed to enable MFC special clock\n");
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goto err_s_clk;
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}
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}
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}
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atomic_set(&pm->power, 0);
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#ifdef CONFIG_PM_RUNTIME
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pm->device = &dev->plat_dev->dev;
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pm_runtime_enable(pm->device);
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#endif
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#ifdef CLK_DEBUG
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atomic_set(&clk_ref, 0);
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#endif
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return 0;
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err_s_clk:
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clk_put(pm->clock);
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err_p_ip_clk:
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clk_put(pm->clock_gate);
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err_g_ip_clk:
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return ret;
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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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if (dev->variant->version != MFC_VERSION_V6 &&
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pm->clock) {
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clk_disable_unprepare(pm->clock);
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clk_put(pm->clock);
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}
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clk_unprepare(pm->clock_gate);
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clk_put(pm->clock_gate);
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#ifdef CONFIG_PM_RUNTIME
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pm_runtime_disable(pm->device);
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#endif
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}
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int s5p_mfc_clock_on(void)
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{
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int ret;
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#ifdef CLK_DEBUG
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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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#endif
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ret = clk_enable(pm->clock_gate);
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return ret;
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}
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void s5p_mfc_clock_off(void)
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{
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#ifdef CLK_DEBUG
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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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#endif
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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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#ifdef CONFIG_PM_RUNTIME
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return pm_runtime_get_sync(pm->device);
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#else
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atomic_set(&pm->power, 1);
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return 0;
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#endif
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}
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int s5p_mfc_power_off(void)
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{
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#ifdef CONFIG_PM_RUNTIME
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return pm_runtime_put_sync(pm->device);
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#else
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atomic_set(&pm->power, 0);
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return 0;
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#endif
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}
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