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gerrit-public.fairphone.software / kernel / msm-5.4 / acf604b709e6b933638bd72d52c5b2e0ff37ff16 / . / drivers / video / fbdev / omap2 / dss / hdmi_common.c
blob: 7d5f1039de9f3fffe00f3d8f2ecf8d5acc4b11b5 [file] [log] [blame]
Archit Taneja08d83e4e2013-09-17 11:43:15 +0530[diff] [blame]1
Tomi Valkeinenac9f2422013-11-14 13:46:32 +0200[diff] [blame]2#define DSS_SUBSYS_NAME "HDMI"
3
Archit Taneja08d83e4e2013-09-17 11:43:15 +0530[diff] [blame]4#include <linux/kernel.h>
5#include <linux/err.h>
Tomi Valkeinen2f5dc672014-04-17 12:54:02 +0300[diff] [blame]6#include <linux/of.h>
Archit Taneja08d83e4e2013-09-17 11:43:15 +0530[diff] [blame]7#include <video/omapdss.h>
8
9#include "hdmi.h"
10
Tomi Valkeinen2f5dc672014-04-17 12:54:02 +0300[diff] [blame]11int hdmi_parse_lanes_of(struct platform_device *pdev, struct device_node *ep,
12 struct hdmi_phy_data *phy)
13{
14 struct property *prop;
15 int r, len;
16
17 prop = of_find_property(ep, "lanes", &len);
18 if (prop) {
19 u32 lanes[8];
20
21 if (len / sizeof(u32) != ARRAY_SIZE(lanes)) {
22 dev_err(&pdev->dev, "bad number of lanes\n");
23 return -EINVAL;
24 }
25
26 r = of_property_read_u32_array(ep, "lanes", lanes,
27 ARRAY_SIZE(lanes));
28 if (r) {
29 dev_err(&pdev->dev, "failed to read lane data\n");
30 return r;
31 }
32
33 r = hdmi_phy_parse_lanes(phy, lanes);
34 if (r) {
35 dev_err(&pdev->dev, "failed to parse lane data\n");
36 return r;
37 }
38 } else {
39 static const u32 default_lanes[] = { 0, 1, 2, 3, 4, 5, 6, 7 };
40
41 r = hdmi_phy_parse_lanes(phy, default_lanes);
42 if (WARN_ON(r)) {
43 dev_err(&pdev->dev, "failed to parse lane data\n");
44 return r;
45 }
46 }
47
48 return 0;
49}
50
Archit Taneja08d83e4e2013-09-17 11:43:15 +0530[diff] [blame]51#if defined(CONFIG_OMAP4_DSS_HDMI_AUDIO)
52int hdmi_compute_acr(u32 pclk, u32 sample_freq, u32 *n, u32 *cts)
53{
54 u32 deep_color;
55 bool deep_color_correct = false;
56
57 if (n == NULL || cts == NULL)
58 return -EINVAL;
59
60 /* TODO: When implemented, query deep color mode here. */
61 deep_color = 100;
62
63 /*
64 * When using deep color, the default N value (as in the HDMI
65 * specification) yields to an non-integer CTS. Hence, we
66 * modify it while keeping the restrictions described in
67 * section 7.2.1 of the HDMI 1.4a specification.
68 */
69 switch (sample_freq) {
70 case 32000:
71 case 48000:
72 case 96000:
73 case 192000:
74 if (deep_color == 125)
Jyri Sarhaa57a22c2014-04-11 16:25:07 +0300[diff] [blame]75 if (pclk == 27027000 || pclk == 74250000)
Archit Taneja08d83e4e2013-09-17 11:43:15 +0530[diff] [blame]76 deep_color_correct = true;
77 if (deep_color == 150)
Jyri Sarhaa57a22c2014-04-11 16:25:07 +0300[diff] [blame]78 if (pclk == 27027000)
Archit Taneja08d83e4e2013-09-17 11:43:15 +0530[diff] [blame]79 deep_color_correct = true;
80 break;
81 case 44100:
82 case 88200:
83 case 176400:
84 if (deep_color == 125)
Jyri Sarhaa57a22c2014-04-11 16:25:07 +0300[diff] [blame]85 if (pclk == 27027000)
Archit Taneja08d83e4e2013-09-17 11:43:15 +0530[diff] [blame]86 deep_color_correct = true;
87 break;
88 default:
89 return -EINVAL;
90 }
91
92 if (deep_color_correct) {
93 switch (sample_freq) {
94 case 32000:
95 *n = 8192;
96 break;
97 case 44100:
98 *n = 12544;
99 break;
100 case 48000:
101 *n = 8192;
102 break;
103 case 88200:
104 *n = 25088;
105 break;
106 case 96000:
107 *n = 16384;
108 break;
109 case 176400:
110 *n = 50176;
111 break;
112 case 192000:
113 *n = 32768;
114 break;
115 default:
116 return -EINVAL;
117 }
118 } else {
119 switch (sample_freq) {
120 case 32000:
121 *n = 4096;
122 break;
123 case 44100:
124 *n = 6272;
125 break;
126 case 48000:
127 *n = 6144;
128 break;
129 case 88200:
130 *n = 12544;
131 break;
132 case 96000:
133 *n = 12288;
134 break;
135 case 176400:
136 *n = 25088;
137 break;
138 case 192000:
139 *n = 24576;
140 break;
141 default:
142 return -EINVAL;
143 }
144 }
145 /* Calculate CTS. See HDMI 1.3a or 1.4a specifications */
Jyri Sarhaa57a22c2014-04-11 16:25:07 +0300[diff] [blame]146 *cts = (pclk/1000) * (*n / 128) * deep_color / (sample_freq / 10);
Archit Taneja08d83e4e2013-09-17 11:43:15 +0530[diff] [blame]147
148 return 0;
149}
150#endif