xref: /linux/drivers/gpu/drm/msm/dp/dp_link.h (revision d99ff463ecf651437e9e4abe68f331dfb6b5bd9d)
1 /* SPDX-License-Identifier: GPL-2.0-only */
2 /*
3  * Copyright (c) 2012-2020, The Linux Foundation. All rights reserved.
4  */
5 
6 #ifndef _DP_LINK_H_
7 #define _DP_LINK_H_
8 
9 #include "dp_aux.h"
10 
11 #define DS_PORT_STATUS_CHANGED 0x200
12 #define DP_TEST_BIT_DEPTH_UNKNOWN 0xFFFFFFFF
13 #define DP_LINK_CAP_ENHANCED_FRAMING (1 << 0)
14 
15 struct dp_link_info {
16 	unsigned char revision;
17 	unsigned int rate;
18 	unsigned int num_lanes;
19 	unsigned long capabilities;
20 };
21 
22 enum dp_link_voltage_level {
23 	DP_TRAIN_VOLTAGE_SWING_LVL_0	= 0,
24 	DP_TRAIN_VOLTAGE_SWING_LVL_1	= 1,
25 	DP_TRAIN_VOLTAGE_SWING_LVL_2	= 2,
26 	DP_TRAIN_VOLTAGE_SWING_MAX	= DP_TRAIN_VOLTAGE_SWING_LVL_2,
27 };
28 
29 enum dp_link_preemaphasis_level {
30 	DP_TRAIN_PRE_EMPHASIS_LVL_0	= 0,
31 	DP_TRAIN_PRE_EMPHASIS_LVL_1	= 1,
32 	DP_TRAIN_PRE_EMPHASIS_LVL_2	= 2,
33 	DP_TRAIN_PRE_EMPHASIS_MAX	= DP_TRAIN_PRE_EMPHASIS_LVL_2,
34 };
35 
36 struct dp_link_test_video {
37 	u32 test_video_pattern;
38 	u32 test_bit_depth;
39 	u32 test_dyn_range;
40 	u32 test_h_total;
41 	u32 test_v_total;
42 	u32 test_h_start;
43 	u32 test_v_start;
44 	u32 test_hsync_pol;
45 	u32 test_hsync_width;
46 	u32 test_vsync_pol;
47 	u32 test_vsync_width;
48 	u32 test_h_width;
49 	u32 test_v_height;
50 	u32 test_rr_d;
51 	u32 test_rr_n;
52 };
53 
54 struct dp_link_test_audio {
55 	u32 test_audio_sampling_rate;
56 	u32 test_audio_channel_count;
57 	u32 test_audio_pattern_type;
58 	u32 test_audio_period_ch_1;
59 	u32 test_audio_period_ch_2;
60 	u32 test_audio_period_ch_3;
61 	u32 test_audio_period_ch_4;
62 	u32 test_audio_period_ch_5;
63 	u32 test_audio_period_ch_6;
64 	u32 test_audio_period_ch_7;
65 	u32 test_audio_period_ch_8;
66 };
67 
68 struct dp_link_phy_params {
69 	u32 phy_test_pattern_sel;
70 	u8 v_level;
71 	u8 p_level;
72 };
73 
74 struct dp_link {
75 	u32 sink_request;
76 	u32 test_response;
77 	bool psm_enabled;
78 
79 	u8 sink_count;
80 	struct dp_link_test_video test_video;
81 	struct dp_link_test_audio test_audio;
82 	struct dp_link_phy_params phy_params;
83 	struct dp_link_info link_params;
84 };
85 
86 /**
87  * mdss_dp_test_bit_depth_to_bpp() - convert test bit depth to bpp
88  * @tbd: test bit depth
89  *
90  * Returns the bits per pixel (bpp) to be used corresponding to the
91  * git bit depth value. This function assumes that bit depth has
92  * already been validated.
93  */
94 static inline u32 dp_link_bit_depth_to_bpp(u32 tbd)
95 {
96 	/*
97 	 * Few simplistic rules and assumptions made here:
98 	 *    1. Bit depth is per color component
99 	 *    2. If bit depth is unknown return 0
100 	 *    3. Assume 3 color components
101 	 */
102 	switch (tbd) {
103 	case DP_TEST_BIT_DEPTH_6:
104 		return 18;
105 	case DP_TEST_BIT_DEPTH_8:
106 		return 24;
107 	case DP_TEST_BIT_DEPTH_10:
108 		return 30;
109 	case DP_TEST_BIT_DEPTH_UNKNOWN:
110 	default:
111 		return 0;
112 	}
113 }
114 
115 /**
116  * dp_test_bit_depth_to_bpc() - convert test bit depth to bpc
117  * @tbd: test bit depth
118  *
119  * Returns the bits per comp (bpc) to be used corresponding to the
120  * bit depth value. This function assumes that bit depth has
121  * already been validated.
122  */
123 static inline u32 dp_link_bit_depth_to_bpc(u32 tbd)
124 {
125 	switch (tbd) {
126 	case DP_TEST_BIT_DEPTH_6:
127 		return 6;
128 	case DP_TEST_BIT_DEPTH_8:
129 		return 8;
130 	case DP_TEST_BIT_DEPTH_10:
131 		return 10;
132 	case DP_TEST_BIT_DEPTH_UNKNOWN:
133 	default:
134 		return 0;
135 	}
136 }
137 
138 void dp_link_reset_phy_params_vx_px(struct dp_link *dp_link);
139 u32 dp_link_get_test_bits_depth(struct dp_link *dp_link, u32 bpp);
140 int dp_link_process_request(struct dp_link *dp_link);
141 int dp_link_get_colorimetry_config(struct dp_link *dp_link);
142 int dp_link_adjust_levels(struct dp_link *dp_link, u8 *link_status);
143 bool dp_link_send_test_response(struct dp_link *dp_link);
144 int dp_link_psm_config(struct dp_link *dp_link,
145 		struct dp_link_info *link_info, bool enable);
146 bool dp_link_send_edid_checksum(struct dp_link *dp_link, u8 checksum);
147 
148 /**
149  * dp_link_get() - get the functionalities of dp test module
150  *
151  *
152  * return: a pointer to dp_link struct
153  */
154 struct dp_link *dp_link_get(struct device *dev, struct drm_dp_aux *aux);
155 
156 #endif /* _DP_LINK_H_ */
157