xref: /linux/drivers/gpu/drm/msm/dp/dp_link.h (revision db5d28c0bfe566908719bec8e25443aabecbb802)
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 #define DP_TRAIN_LEVEL_MAX	3
23 
24 struct dp_link_test_video {
25 	u32 test_video_pattern;
26 	u32 test_bit_depth;
27 	u32 test_dyn_range;
28 	u32 test_h_total;
29 	u32 test_v_total;
30 	u32 test_h_start;
31 	u32 test_v_start;
32 	u32 test_hsync_pol;
33 	u32 test_hsync_width;
34 	u32 test_vsync_pol;
35 	u32 test_vsync_width;
36 	u32 test_h_width;
37 	u32 test_v_height;
38 	u32 test_rr_d;
39 	u32 test_rr_n;
40 };
41 
42 struct dp_link_test_audio {
43 	u32 test_audio_sampling_rate;
44 	u32 test_audio_channel_count;
45 	u32 test_audio_pattern_type;
46 	u32 test_audio_period_ch_1;
47 	u32 test_audio_period_ch_2;
48 	u32 test_audio_period_ch_3;
49 	u32 test_audio_period_ch_4;
50 	u32 test_audio_period_ch_5;
51 	u32 test_audio_period_ch_6;
52 	u32 test_audio_period_ch_7;
53 	u32 test_audio_period_ch_8;
54 };
55 
56 struct dp_link_phy_params {
57 	u32 phy_test_pattern_sel;
58 	u8 v_level;
59 	u8 p_level;
60 };
61 
62 struct dp_link {
63 	u32 sink_request;
64 	u32 test_response;
65 
66 	u8 sink_count;
67 	struct dp_link_test_video test_video;
68 	struct dp_link_test_audio test_audio;
69 	struct dp_link_phy_params phy_params;
70 	struct dp_link_info link_params;
71 };
72 
73 /**
74  * mdss_dp_test_bit_depth_to_bpp() - convert test bit depth to bpp
75  * @tbd: test bit depth
76  *
77  * Returns the bits per pixel (bpp) to be used corresponding to the
78  * git bit depth value. This function assumes that bit depth has
79  * already been validated.
80  */
dp_link_bit_depth_to_bpp(u32 tbd)81 static inline u32 dp_link_bit_depth_to_bpp(u32 tbd)
82 {
83 	/*
84 	 * Few simplistic rules and assumptions made here:
85 	 *    1. Bit depth is per color component
86 	 *    2. If bit depth is unknown return 0
87 	 *    3. Assume 3 color components
88 	 */
89 	switch (tbd) {
90 	case DP_TEST_BIT_DEPTH_6:
91 		return 18;
92 	case DP_TEST_BIT_DEPTH_8:
93 		return 24;
94 	case DP_TEST_BIT_DEPTH_10:
95 		return 30;
96 	case DP_TEST_BIT_DEPTH_UNKNOWN:
97 	default:
98 		return 0;
99 	}
100 }
101 
102 void dp_link_reset_phy_params_vx_px(struct dp_link *dp_link);
103 u32 dp_link_get_test_bits_depth(struct dp_link *dp_link, u32 bpp);
104 int dp_link_process_request(struct dp_link *dp_link);
105 int dp_link_get_colorimetry_config(struct dp_link *dp_link);
106 int dp_link_adjust_levels(struct dp_link *dp_link, u8 *link_status);
107 bool dp_link_send_test_response(struct dp_link *dp_link);
108 int dp_link_psm_config(struct dp_link *dp_link,
109 		struct dp_link_info *link_info, bool enable);
110 bool dp_link_send_edid_checksum(struct dp_link *dp_link, u8 checksum);
111 
112 /**
113  * dp_link_get() - get the functionalities of dp test module
114  *
115  *
116  * return: a pointer to dp_link struct
117  */
118 struct dp_link *dp_link_get(struct device *dev, struct drm_dp_aux *aux);
119 
120 #endif /* _DP_LINK_H_ */
121