include/drm/drm_dp_helper.h

   1 /*
   2  * Copyright © 2008 Keith Packard
   3  *
   4  * Permission to use, copy, modify, distribute, and sell this software and its
   5  * documentation for any purpose is hereby granted without fee, provided that
   6  * the above copyright notice appear in all copies and that both that copyright
   7  * notice and this permission notice appear in supporting documentation, and
   8  * that the name of the copyright holders not be used in advertising or
   9  * publicity pertaining to distribution of the software without specific,
  10  * written prior permission.  The copyright holders make no representations
  11  * about the suitability of this software for any purpose.  It is provided "as
  12  * is" without express or implied warranty.
  13  *
  14  * THE COPYRIGHT HOLDERS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
  15  * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
  16  * EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY SPECIAL, INDIRECT OR
  17  * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE,
  18  * DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
  19  * TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
  20  * OF THIS SOFTWARE.
  21  */
  22
  23 #ifndef _DRM_DP_HELPER_H_
  24 #define _DRM_DP_HELPER_H_
  25
  26 #include <linux/types.h>
  27 #include <linux/i2c.h>
  28
  29 /* From the VESA DisplayPort spec */
  30
  31 #define AUX_NATIVE_WRITE        0x8
  32 #define AUX_NATIVE_READ         0x9
  33 #define AUX_I2C_WRITE           0x0
  34 #define AUX_I2C_READ            0x1
  35 #define AUX_I2C_STATUS          0x2
  36 #define AUX_I2C_MOT             0x4
  37
  38 #define AUX_NATIVE_REPLY_ACK    (0x0 << 4)
  39 #define AUX_NATIVE_REPLY_NACK   (0x1 << 4)
  40 #define AUX_NATIVE_REPLY_DEFER  (0x2 << 4)
  41 #define AUX_NATIVE_REPLY_MASK   (0x3 << 4)
  42
  43 #define AUX_I2C_REPLY_ACK       (0x0 << 6)
  44 #define AUX_I2C_REPLY_NACK      (0x1 << 6)
  45 #define AUX_I2C_REPLY_DEFER     (0x2 << 6)
  46 #define AUX_I2C_REPLY_MASK      (0x3 << 6)
  47
  48 /* AUX CH addresses */
  49 /* DPCD */
  50 #define DP_DPCD_REV                         0x000
  51
  52 #define DP_MAX_LINK_RATE                    0x001
  53
  54 #define DP_MAX_LANE_COUNT                   0x002
  55 # define DP_MAX_LANE_COUNT_MASK             0x1f
  56 # define DP_ENHANCED_FRAME_CAP              (1 << 7)
  57
  58 #define DP_MAX_DOWNSPREAD                   0x003
  59 # define DP_NO_AUX_HANDSHAKE_LINK_TRAINING  (1 << 6)
  60
  61 #define DP_NORP                             0x004
  62
  63 #define DP_DOWNSTREAMPORT_PRESENT           0x005
  64 # define DP_DWN_STRM_PORT_PRESENT           (1 << 0)
  65 # define DP_DWN_STRM_PORT_TYPE_MASK         0x06
  66 /* 00b = DisplayPort */
  67 /* 01b = Analog */
  68 /* 10b = TMDS or HDMI */
  69 /* 11b = Other */
  70 # define DP_FORMAT_CONVERSION               (1 << 3)
  71
  72 #define DP_MAIN_LINK_CHANNEL_CODING         0x006
  73
  74 /* link configuration */
  75 #define DP_LINK_BW_SET                      0x100
  76 # define DP_LINK_BW_1_62                    0x06
  77 # define DP_LINK_BW_2_7                     0x0a
  78
  79 #define DP_LANE_COUNT_SET                   0x101
  80 # define DP_LANE_COUNT_MASK                 0x0f
  81 # define DP_LANE_COUNT_ENHANCED_FRAME_EN    (1 << 7)
  82
  83 #define DP_TRAINING_PATTERN_SET             0x102
  84 # define DP_TRAINING_PATTERN_DISABLE        0
  85 # define DP_TRAINING_PATTERN_1              1
  86 # define DP_TRAINING_PATTERN_2              2
  87 # define DP_TRAINING_PATTERN_MASK           0x3
  88
  89 # define DP_LINK_QUAL_PATTERN_DISABLE       (0 << 2)
  90 # define DP_LINK_QUAL_PATTERN_D10_2         (1 << 2)
  91 # define DP_LINK_QUAL_PATTERN_ERROR_RATE    (2 << 2)
  92 # define DP_LINK_QUAL_PATTERN_PRBS7         (3 << 2)
  93 # define DP_LINK_QUAL_PATTERN_MASK          (3 << 2)
  94
  95 # define DP_RECOVERED_CLOCK_OUT_EN          (1 << 4)
  96 # define DP_LINK_SCRAMBLING_DISABLE         (1 << 5)
  97
  98 # define DP_SYMBOL_ERROR_COUNT_BOTH         (0 << 6)
  99 # define DP_SYMBOL_ERROR_COUNT_DISPARITY    (1 << 6)
 100 # define DP_SYMBOL_ERROR_COUNT_SYMBOL       (2 << 6)
 101 # define DP_SYMBOL_ERROR_COUNT_MASK         (3 << 6)
 102
 103 #define DP_TRAINING_LANE0_SET               0x103
 104 #define DP_TRAINING_LANE1_SET               0x104
 105 #define DP_TRAINING_LANE2_SET               0x105
 106 #define DP_TRAINING_LANE3_SET               0x106
 107
 108 # define DP_TRAIN_VOLTAGE_SWING_MASK        0x3
 109 # define DP_TRAIN_VOLTAGE_SWING_SHIFT       0
 110 # define DP_TRAIN_MAX_SWING_REACHED         (1 << 2)
 111 # define DP_TRAIN_VOLTAGE_SWING_400         (0 << 0)
 112 # define DP_TRAIN_VOLTAGE_SWING_600         (1 << 0)
 113 # define DP_TRAIN_VOLTAGE_SWING_800         (2 << 0)
 114 # define DP_TRAIN_VOLTAGE_SWING_1200        (3 << 0)
 115
 116 # define DP_TRAIN_PRE_EMPHASIS_MASK         (3 << 3)
 117 # define DP_TRAIN_PRE_EMPHASIS_0            (0 << 3)
 118 # define DP_TRAIN_PRE_EMPHASIS_3_5          (1 << 3)
 119 # define DP_TRAIN_PRE_EMPHASIS_6            (2 << 3)
 120 # define DP_TRAIN_PRE_EMPHASIS_9_5          (3 << 3)
 121
 122 # define DP_TRAIN_PRE_EMPHASIS_SHIFT        3
 123 # define DP_TRAIN_MAX_PRE_EMPHASIS_REACHED  (1 << 5)
 124
 125 #define DP_DOWNSPREAD_CTRL                  0x107
 126 # define DP_SPREAD_AMP_0_5                  (1 << 4)
 127
 128 #define DP_MAIN_LINK_CHANNEL_CODING_SET     0x108
 129 # define DP_SET_ANSI_8B10B                  (1 << 0)
 130
 131 #define DP_LANE0_1_STATUS                   0x202
 132 #define DP_LANE2_3_STATUS                   0x203
 133 # define DP_LANE_CR_DONE                    (1 << 0)
 134 # define DP_LANE_CHANNEL_EQ_DONE            (1 << 1)
 135 # define DP_LANE_SYMBOL_LOCKED              (1 << 2)
 136
 137 #define DP_CHANNEL_EQ_BITS (DP_LANE_CR_DONE |           \
 138                             DP_LANE_CHANNEL_EQ_DONE |   \
 139                             DP_LANE_SYMBOL_LOCKED)
 140
 141 #define DP_LANE_ALIGN_STATUS_UPDATED        0x204
 142
 143 #define DP_INTERLANE_ALIGN_DONE             (1 << 0)
 144 #define DP_DOWNSTREAM_PORT_STATUS_CHANGED   (1 << 6)
 145 #define DP_LINK_STATUS_UPDATED              (1 << 7)
 146
 147 #define DP_SINK_STATUS                      0x205
 148
 149 #define DP_RECEIVE_PORT_0_STATUS            (1 << 0)
 150 #define DP_RECEIVE_PORT_1_STATUS            (1 << 1)
 151
 152 #define DP_ADJUST_REQUEST_LANE0_1           0x206
 153 #define DP_ADJUST_REQUEST_LANE2_3           0x207
 154 # define DP_ADJUST_VOLTAGE_SWING_LANE0_MASK  0x03
 155 # define DP_ADJUST_VOLTAGE_SWING_LANE0_SHIFT 0
 156 # define DP_ADJUST_PRE_EMPHASIS_LANE0_MASK   0x0c
 157 # define DP_ADJUST_PRE_EMPHASIS_LANE0_SHIFT  2
 158 # define DP_ADJUST_VOLTAGE_SWING_LANE1_MASK  0x30
 159 # define DP_ADJUST_VOLTAGE_SWING_LANE1_SHIFT 4
 160 # define DP_ADJUST_PRE_EMPHASIS_LANE1_MASK   0xc0
 161 # define DP_ADJUST_PRE_EMPHASIS_LANE1_SHIFT  6
 162
 163 #define DP_SET_POWER                        0x600
 164 # define DP_SET_POWER_D0                    0x1
 165 # define DP_SET_POWER_D3                    0x2
 166
 167 #define MODE_I2C_START  1
 168 #define MODE_I2C_WRITE  2
 169 #define MODE_I2C_READ   4
 170 #define MODE_I2C_STOP   8
 171
 172 struct i2c_algo_dp_aux_data {
 173         bool running;
 174         u16 address;
 175         int (*aux_ch) (struct i2c_adapter *adapter,
 176                        int mode, uint8_t write_byte,
 177                        uint8_t *read_byte);
 178 };
 179
 180 int
 181 i2c_dp_aux_add_bus(struct i2c_adapter *adapter);
 182
 183 #endif /* _DRM_DP_HELPER_H_ */