1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
|
/*
* linux/drivers/media/platform/s5p-mfc/s5p_mfc_pm.c
*
* Copyright (c) 2010 Samsung Electronics Co., Ltd.
* http://www.samsung.com/
*
* 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.
*/
#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"
#define MFC_GATE_CLK_NAME "mfc"
#define MFC_SCLK_NAME "sclk_mfc"
#define MFC_SCLK_RATE (200 * 1000000)
#define CLK_DEBUG
static struct s5p_mfc_pm *pm;
static struct s5p_mfc_dev *p_dev;
#ifdef CLK_DEBUG
static atomic_t clk_ref;
#endif
int s5p_mfc_init_pm(struct s5p_mfc_dev *dev)
{
int ret = 0;
pm = &dev->pm;
p_dev = dev;
pm->clock_gate = clk_get(&dev->plat_dev->dev, MFC_GATE_CLK_NAME);
if (IS_ERR(pm->clock_gate)) {
mfc_err("Failed to get clock-gating control\n");
ret = PTR_ERR(pm->clock_gate);
goto err_g_ip_clk;
}
ret = clk_prepare(pm->clock_gate);
if (ret) {
mfc_err("Failed to prepare clock-gating control\n");
goto err_p_ip_clk;
}
if (dev->variant->version != MFC_VERSION_V6) {
pm->clock = clk_get(&dev->plat_dev->dev, MFC_SCLK_NAME);
if (IS_ERR(pm->clock)) {
mfc_info("Failed to get MFC special clock control\n");
} else {
clk_set_rate(pm->clock, MFC_SCLK_RATE);
ret = clk_prepare_enable(pm->clock);
if (ret) {
mfc_err("Failed to enable MFC special clock\n");
goto err_s_clk;
}
}
}
atomic_set(&pm->power, 0);
#ifdef CONFIG_PM
pm->device = &dev->plat_dev->dev;
pm_runtime_enable(pm->device);
#endif
#ifdef CLK_DEBUG
atomic_set(&clk_ref, 0);
#endif
return 0;
err_s_clk:
clk_put(pm->clock);
err_p_ip_clk:
clk_put(pm->clock_gate);
err_g_ip_clk:
return ret;
}
void s5p_mfc_final_pm(struct s5p_mfc_dev *dev)
{
if (dev->variant->version != MFC_VERSION_V6 &&
pm->clock) {
clk_disable_unprepare(pm->clock);
clk_put(pm->clock);
}
clk_unprepare(pm->clock_gate);
clk_put(pm->clock_gate);
#ifdef CONFIG_PM
pm_runtime_disable(pm->device);
#endif
}
int s5p_mfc_clock_on(void)
{
int ret;
#ifdef CLK_DEBUG
atomic_inc(&clk_ref);
mfc_debug(3, "+ %d\n", atomic_read(&clk_ref));
#endif
ret = clk_enable(pm->clock_gate);
return ret;
}
void s5p_mfc_clock_off(void)
{
#ifdef CLK_DEBUG
atomic_dec(&clk_ref);
mfc_debug(3, "- %d\n", atomic_read(&clk_ref));
#endif
clk_disable(pm->clock_gate);
}
int s5p_mfc_power_on(void)
{
#ifdef CONFIG_PM
return pm_runtime_get_sync(pm->device);
#else
atomic_set(&pm->power, 1);
return 0;
#endif
}
int s5p_mfc_power_off(void)
{
#ifdef CONFIG_PM
return pm_runtime_put_sync(pm->device);
#else
atomic_set(&pm->power, 0);
return 0;
#endif
}
|
