dp_link.h

  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#include <drm/display/drm_dp_helper.h>
 11
 12#define DS_PORT_STATUS_CHANGED 0x200
 13#define DP_TEST_BIT_DEPTH_UNKNOWN 0xFFFFFFFF
 14#define DP_LINK_CAP_ENHANCED_FRAMING (1 << 0)
 15#define DP_MAX_NUM_DP_LANES    4
 16
 17struct msm_dp_link_info {
 18	unsigned char revision;
 19	unsigned int rate;
 20	unsigned int num_lanes;
 21	unsigned long capabilities;
 22};
 23
 24#define DP_TRAIN_LEVEL_MAX	3
 25
 26struct msm_dp_link_test_video {
 27	u32 test_video_pattern;
 28	u32 test_bit_depth;
 29	u32 test_dyn_range;
 30	u32 test_h_total;
 31	u32 test_v_total;
 32	u32 test_h_start;
 33	u32 test_v_start;
 34	u32 test_hsync_pol;
 35	u32 test_hsync_width;
 36	u32 test_vsync_pol;
 37	u32 test_vsync_width;
 38	u32 test_h_width;
 39	u32 test_v_height;
 40	u32 test_rr_d;
 41	u32 test_rr_n;
 42};
 43
 44struct msm_dp_link_test_audio {
 45	u32 test_audio_sampling_rate;
 46	u32 test_audio_channel_count;
 47	u32 test_audio_pattern_type;
 48	u32 test_audio_period_ch_1;
 49	u32 test_audio_period_ch_2;
 50	u32 test_audio_period_ch_3;
 51	u32 test_audio_period_ch_4;
 52	u32 test_audio_period_ch_5;
 53	u32 test_audio_period_ch_6;
 54	u32 test_audio_period_ch_7;
 55	u32 test_audio_period_ch_8;
 56};
 57
 58struct msm_dp_link_phy_params {
 59	u32 phy_test_pattern_sel;
 60	u8 v_level;
 61	u8 p_level;
 62};
 63
 64struct msm_dp_link {
 65	u8 lttpr_common_caps[DP_LTTPR_COMMON_CAP_SIZE];
 66	int lttpr_count;
 67
 68	u32 sink_request;
 69	u32 test_response;
 70
 71	u8 sink_count;
 72	struct msm_dp_link_test_video test_video;
 73	struct msm_dp_link_test_audio test_audio;
 74	struct msm_dp_link_phy_params phy_params;
 75	struct msm_dp_link_info link_params;
 76
 77	u32 lane_map[DP_MAX_NUM_DP_LANES];
 78	u32 max_dp_lanes;
 79	u32 max_dp_link_rate;
 80};
 81
 82/**
 83 * msm_dp_link_bit_depth_to_bpp() - convert test bit depth to bpp
 84 * @tbd: test bit depth
 85 *
 86 * Returns: the bits per pixel (bpp) to be used corresponding to the
 87 * bit depth value. This function assumes that bit depth has
 88 * already been validated.
 89 */
 90static inline u32 msm_dp_link_bit_depth_to_bpp(u32 tbd)
 91{
 92	/*
 93	 * Few simplistic rules and assumptions made here:
 94	 *    1. Bit depth is per color component
 95	 *    2. If bit depth is unknown return 0
 96	 *    3. Assume 3 color components
 97	 */
 98	switch (tbd) {
 99	case DP_TEST_BIT_DEPTH_6:
100		return 18;
101	case DP_TEST_BIT_DEPTH_8:
102		return 24;
103	case DP_TEST_BIT_DEPTH_10:
104		return 30;
105	case DP_TEST_BIT_DEPTH_UNKNOWN:
106	default:
107		return 0;
108	}
109}
110
111void msm_dp_link_reset_phy_params_vx_px(struct msm_dp_link *msm_dp_link);
112u32 msm_dp_link_get_test_bits_depth(struct msm_dp_link *msm_dp_link, u32 bpp);
113int msm_dp_link_process_request(struct msm_dp_link *msm_dp_link);
114int msm_dp_link_get_colorimetry_config(struct msm_dp_link *msm_dp_link);
115int msm_dp_link_adjust_levels(struct msm_dp_link *msm_dp_link, u8 *link_status);
116bool msm_dp_link_send_test_response(struct msm_dp_link *msm_dp_link);
117int msm_dp_link_psm_config(struct msm_dp_link *msm_dp_link,
118		struct msm_dp_link_info *link_info, bool enable);
119bool msm_dp_link_send_edid_checksum(struct msm_dp_link *msm_dp_link, u8 checksum);
120
121/**
122 * msm_dp_link_get() - get the functionalities of dp test module
123 * @dev: kernel device structure
124 * @aux: DisplayPort AUX channel
125 *
126 * return: a pointer to msm_dp_link struct
127 */
128struct msm_dp_link *msm_dp_link_get(struct device *dev, struct drm_dp_aux *aux);
129
130#endif /* _DP_LINK_H_ */