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dec72739 TR |
1 | /* |
2 | * Copyright (C) 2013 NVIDIA Corporation | |
3 | * | |
9a2ac2dc TR |
4 | * This program is free software; you can redistribute it and/or modify |
5 | * it under the terms of the GNU General Public License version 2 as | |
6 | * published by the Free Software Foundation. | |
dec72739 TR |
7 | */ |
8 | ||
81239c6f | 9 | #include <linux/errno.h> |
dec72739 TR |
10 | #include <linux/kernel.h> |
11 | ||
12 | #include "mipi-phy.h" | |
13 | ||
14 | /* | |
15 | * Default D-PHY timings based on MIPI D-PHY specification. Derived from | |
16 | * the valid ranges specified in Section 5.9 of the D-PHY specification | |
17 | * with minor adjustments. | |
18 | */ | |
19 | int mipi_dphy_timing_get_default(struct mipi_dphy_timing *timing, | |
20 | unsigned long period) | |
21 | { | |
22 | timing->clkmiss = 0; | |
23 | timing->clkpost = 70 + 52 * period; | |
24 | timing->clkpre = 8; | |
25 | timing->clkprepare = 65; | |
26 | timing->clksettle = 95; | |
27 | timing->clktermen = 0; | |
28 | timing->clktrail = 80; | |
29 | timing->clkzero = 260; | |
30 | timing->dtermen = 0; | |
31 | timing->eot = 0; | |
32 | timing->hsexit = 120; | |
33 | timing->hsprepare = 65 + 5 * period; | |
34 | timing->hszero = 145 + 5 * period; | |
35 | timing->hssettle = 85 + 6 * period; | |
36 | timing->hsskip = 40; | |
37 | timing->hstrail = max(8 * period, 60 + 4 * period); | |
38 | timing->init = 100000; | |
39 | timing->lpx = 60; | |
40 | timing->taget = 5 * timing->lpx; | |
41 | timing->tago = 4 * timing->lpx; | |
42 | timing->tasure = 2 * timing->lpx; | |
43 | timing->wakeup = 1000000; | |
44 | ||
45 | return 0; | |
46 | } | |
47 | ||
48 | /* | |
49 | * Validate D-PHY timing according to MIPI Alliance Specification for D-PHY, | |
50 | * Section 5.9 "Global Operation Timing Parameters". | |
51 | */ | |
52 | int mipi_dphy_timing_validate(struct mipi_dphy_timing *timing, | |
53 | unsigned long period) | |
54 | { | |
55 | if (timing->clkmiss > 60) | |
56 | return -EINVAL; | |
57 | ||
58 | if (timing->clkpost < (60 + 52 * period)) | |
59 | return -EINVAL; | |
60 | ||
61 | if (timing->clkpre < 8) | |
62 | return -EINVAL; | |
63 | ||
64 | if (timing->clkprepare < 38 || timing->clkprepare > 95) | |
65 | return -EINVAL; | |
66 | ||
67 | if (timing->clksettle < 95 || timing->clksettle > 300) | |
68 | return -EINVAL; | |
69 | ||
70 | if (timing->clktermen > 38) | |
71 | return -EINVAL; | |
72 | ||
73 | if (timing->clktrail < 60) | |
74 | return -EINVAL; | |
75 | ||
76 | if (timing->clkprepare + timing->clkzero < 300) | |
77 | return -EINVAL; | |
78 | ||
79 | if (timing->dtermen > 35 + 4 * period) | |
80 | return -EINVAL; | |
81 | ||
82 | if (timing->eot > 105 + 12 * period) | |
83 | return -EINVAL; | |
84 | ||
85 | if (timing->hsexit < 100) | |
86 | return -EINVAL; | |
87 | ||
88 | if (timing->hsprepare < 40 + 4 * period || | |
89 | timing->hsprepare > 85 + 6 * period) | |
90 | return -EINVAL; | |
91 | ||
92 | if (timing->hsprepare + timing->hszero < 145 + 10 * period) | |
93 | return -EINVAL; | |
94 | ||
95 | if ((timing->hssettle < 85 + 6 * period) || | |
96 | (timing->hssettle > 145 + 10 * period)) | |
97 | return -EINVAL; | |
98 | ||
99 | if (timing->hsskip < 40 || timing->hsskip > 55 + 4 * period) | |
100 | return -EINVAL; | |
101 | ||
102 | if (timing->hstrail < max(8 * period, 60 + 4 * period)) | |
103 | return -EINVAL; | |
104 | ||
105 | if (timing->init < 100000) | |
106 | return -EINVAL; | |
107 | ||
108 | if (timing->lpx < 50) | |
109 | return -EINVAL; | |
110 | ||
111 | if (timing->taget != 5 * timing->lpx) | |
112 | return -EINVAL; | |
113 | ||
114 | if (timing->tago != 4 * timing->lpx) | |
115 | return -EINVAL; | |
116 | ||
117 | if (timing->tasure < timing->lpx || timing->tasure > 2 * timing->lpx) | |
118 | return -EINVAL; | |
119 | ||
120 | if (timing->wakeup < 1000000) | |
121 | return -EINVAL; | |
122 | ||
123 | return 0; | |
124 | } |