xref: /openbmc/linux/include/linux/phy/phy-dp.h (revision 42d06847)
1 /* SPDX-License-Identifier: GPL-2.0 */
2 /*
3  * Copyright (C) 2019 Cadence Design Systems Inc.
4  */
5 
6 #ifndef __PHY_DP_H_
7 #define __PHY_DP_H_
8 
9 #include <linux/types.h>
10 
11 /**
12  * struct phy_configure_opts_dp - DisplayPort PHY configuration set
13  *
14  * This structure is used to represent the configuration state of a
15  * DisplayPort phy.
16  */
17 struct phy_configure_opts_dp {
18 	/**
19 	 * @link_rate:
20 	 *
21 	 * Link Rate, in Mb/s, of the main link.
22 	 *
23 	 * Allowed values: 1620, 2160, 2430, 2700, 3240, 4320, 5400, 8100 Mb/s
24 	 */
25 	unsigned int link_rate;
26 
27 	/**
28 	 * @lanes:
29 	 *
30 	 * Number of active, consecutive, data lanes, starting from
31 	 * lane 0, used for the transmissions on main link.
32 	 *
33 	 * Allowed values: 1, 2, 4
34 	 */
35 	unsigned int lanes;
36 
37 	/**
38 	 * @voltage:
39 	 *
40 	 * Voltage swing levels, as specified by DisplayPort specification,
41 	 * to be used by particular lanes. One value per lane.
42 	 * voltage[0] is for lane 0, voltage[1] is for lane 1, etc.
43 	 *
44 	 * Maximum value: 3
45 	 */
46 	unsigned int voltage[4];
47 
48 	/**
49 	 * @pre:
50 	 *
51 	 * Pre-emphasis levels, as specified by DisplayPort specification, to be
52 	 * used by particular lanes. One value per lane.
53 	 *
54 	 * Maximum value: 3
55 	 */
56 	unsigned int pre[4];
57 
58 	/**
59 	 * @ssc:
60 	 *
61 	 * Flag indicating, whether or not to enable spread-spectrum clocking.
62 	 *
63 	 */
64 	u8 ssc : 1;
65 
66 	/**
67 	 * @set_rate:
68 	 *
69 	 * Flag indicating, whether or not reconfigure link rate and SSC to
70 	 * requested values.
71 	 *
72 	 */
73 	u8 set_rate : 1;
74 
75 	/**
76 	 * @set_lanes:
77 	 *
78 	 * Flag indicating, whether or not reconfigure lane count to
79 	 * requested value.
80 	 *
81 	 */
82 	u8 set_lanes : 1;
83 
84 	/**
85 	 * @set_voltages:
86 	 *
87 	 * Flag indicating, whether or not reconfigure voltage swing
88 	 * and pre-emphasis to requested values. Only lanes specified
89 	 * by "lanes" parameter will be affected.
90 	 *
91 	 */
92 	u8 set_voltages : 1;
93 };
94 
95 #endif /* __PHY_DP_H_ */
96