1 /*
2 * linux/drivers/media/video/s5p-mfc/s5p_mfc_pm.c
3 *
4 * Copyright (c) 2010 Samsung Electronics Co., Ltd.
5 * http://www.samsung.com/
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation; either version 2 of the License, or
10 * (at your option) any later version.
11 */
12
13 #include <linux/clk.h>
14 #include <linux/err.h>
15 #include <linux/platform_device.h>
16 #ifdef CONFIG_PM_RUNTIME
17 #include <linux/pm_runtime.h>
18 #endif
19 #include "s5p_mfc_common.h"
20 #include "s5p_mfc_debug.h"
21 #include "s5p_mfc_pm.h"
22
23 #define MFC_CLKNAME "sclk_mfc"
24 #define MFC_GATE_CLK_NAME "mfc"
25
26 #define CLK_DEBUG
27
28 static struct s5p_mfc_pm *pm;
29 static struct s5p_mfc_dev *p_dev;
30
31 #ifdef CLK_DEBUG
32 atomic_t clk_ref;
33 #endif
34
s5p_mfc_init_pm(struct s5p_mfc_dev * dev)35 int s5p_mfc_init_pm(struct s5p_mfc_dev *dev)
36 {
37 int ret = 0;
38
39 pm = &dev->pm;
40 p_dev = dev;
41 pm->clock_gate = clk_get(&dev->plat_dev->dev, MFC_GATE_CLK_NAME);
42 if (IS_ERR(pm->clock_gate)) {
43 mfc_err("Failed to get clock-gating control\n");
44 ret = -ENOENT;
45 goto err_g_ip_clk;
46 }
47 pm->clock = clk_get(&dev->plat_dev->dev, MFC_CLKNAME);
48 if (IS_ERR(pm->clock)) {
49 mfc_err("Failed to get MFC clock\n");
50 ret = -ENOENT;
51 goto err_g_ip_clk_2;
52 }
53 atomic_set(&pm->power, 0);
54 #ifdef CONFIG_PM_RUNTIME
55 pm->device = &dev->plat_dev->dev;
56 pm_runtime_enable(pm->device);
57 #endif
58 #ifdef CLK_DEBUG
59 atomic_set(&clk_ref, 0);
60 #endif
61 return 0;
62 err_g_ip_clk_2:
63 clk_put(pm->clock_gate);
64 err_g_ip_clk:
65 return ret;
66 }
67
s5p_mfc_final_pm(struct s5p_mfc_dev * dev)68 void s5p_mfc_final_pm(struct s5p_mfc_dev *dev)
69 {
70 clk_put(pm->clock_gate);
71 clk_put(pm->clock);
72 #ifdef CONFIG_PM_RUNTIME
73 pm_runtime_disable(pm->device);
74 #endif
75 }
76
s5p_mfc_clock_on(void)77 int s5p_mfc_clock_on(void)
78 {
79 int ret;
80 #ifdef CLK_DEBUG
81 atomic_inc(&clk_ref);
82 mfc_debug(3, "+ %d", atomic_read(&clk_ref));
83 #endif
84 ret = clk_enable(pm->clock_gate);
85 return ret;
86 }
87
s5p_mfc_clock_off(void)88 void s5p_mfc_clock_off(void)
89 {
90 #ifdef CLK_DEBUG
91 atomic_dec(&clk_ref);
92 mfc_debug(3, "- %d", atomic_read(&clk_ref));
93 #endif
94 clk_disable(pm->clock_gate);
95 }
96
s5p_mfc_power_on(void)97 int s5p_mfc_power_on(void)
98 {
99 #ifdef CONFIG_PM_RUNTIME
100 return pm_runtime_get_sync(pm->device);
101 #else
102 atomic_set(&pm->power, 1);
103 return 0;
104 #endif
105 }
106
s5p_mfc_power_off(void)107 int s5p_mfc_power_off(void)
108 {
109 #ifdef CONFIG_PM_RUNTIME
110 return pm_runtime_put_sync(pm->device);
111 #else
112 atomic_set(&pm->power, 0);
113 return 0;
114 #endif
115 }
116
117
118