summaryrefslogtreecommitdiff
path: root/drivers/video/fbdev/omap2/omapfb/dss/hdmi_common.c
blob: f13d7639826d2af1c6f5a69a165960dc11367c82 (plain)
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
140
141
142
143
144
145
146
147
148
149
// SPDX-License-Identifier: GPL-2.0

#define DSS_SUBSYS_NAME "HDMI"

#include <linux/kernel.h>
#include <linux/err.h>
#include <linux/of.h>
#include <video/omapfb_dss.h>

#include "hdmi.h"

int hdmi_parse_lanes_of(struct platform_device *pdev, struct device_node *ep,
	struct hdmi_phy_data *phy)
{
	struct property *prop;
	int r, len;

	prop = of_find_property(ep, "lanes", &len);
	if (prop) {
		u32 lanes[8];

		if (len / sizeof(u32) != ARRAY_SIZE(lanes)) {
			dev_err(&pdev->dev, "bad number of lanes\n");
			return -EINVAL;
		}

		r = of_property_read_u32_array(ep, "lanes", lanes,
			ARRAY_SIZE(lanes));
		if (r) {
			dev_err(&pdev->dev, "failed to read lane data\n");
			return r;
		}

		r = hdmi_phy_parse_lanes(phy, lanes);
		if (r) {
			dev_err(&pdev->dev, "failed to parse lane data\n");
			return r;
		}
	} else {
		static const u32 default_lanes[] = { 0, 1, 2, 3, 4, 5, 6, 7 };

		r = hdmi_phy_parse_lanes(phy, default_lanes);
		if (WARN_ON(r)) {
			dev_err(&pdev->dev, "failed to parse lane data\n");
			return r;
		}
	}

	return 0;
}

int hdmi_compute_acr(u32 pclk, u32 sample_freq, u32 *n, u32 *cts)
{
	u32 deep_color;
	bool deep_color_correct = false;

	if (n == NULL || cts == NULL)
		return -EINVAL;

	/* TODO: When implemented, query deep color mode here. */
	deep_color = 100;

	/*
	 * When using deep color, the default N value (as in the HDMI
	 * specification) yields to an non-integer CTS. Hence, we
	 * modify it while keeping the restrictions described in
	 * section 7.2.1 of the HDMI 1.4a specification.
	 */
	switch (sample_freq) {
	case 32000:
	case 48000:
	case 96000:
	case 192000:
		if (deep_color == 125)
			if (pclk == 27027000 || pclk == 74250000)
				deep_color_correct = true;
		if (deep_color == 150)
			if (pclk == 27027000)
				deep_color_correct = true;
		break;
	case 44100:
	case 88200:
	case 176400:
		if (deep_color == 125)
			if (pclk == 27027000)
				deep_color_correct = true;
		break;
	default:
		return -EINVAL;
	}

	if (deep_color_correct) {
		switch (sample_freq) {
		case 32000:
			*n = 8192;
			break;
		case 44100:
			*n = 12544;
			break;
		case 48000:
			*n = 8192;
			break;
		case 88200:
			*n = 25088;
			break;
		case 96000:
			*n = 16384;
			break;
		case 176400:
			*n = 50176;
			break;
		case 192000:
			*n = 32768;
			break;
		default:
			return -EINVAL;
		}
	} else {
		switch (sample_freq) {
		case 32000:
			*n = 4096;
			break;
		case 44100:
			*n = 6272;
			break;
		case 48000:
			*n = 6144;
			break;
		case 88200:
			*n = 12544;
			break;
		case 96000:
			*n = 12288;
			break;
		case 176400:
			*n = 25088;
			break;
		case 192000:
			*n = 24576;
			break;
		default:
			return -EINVAL;
		}
	}
	/* Calculate CTS. See HDMI 1.3a or 1.4a specifications */
	*cts = (pclk/1000) * (*n / 128) * deep_color / (sample_freq / 10);

	return 0;
}