2 * Copyright © 2008 Keith Packard
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.
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
23 #ifndef _DRM_DP_HELPER_H_
24 #define _DRM_DP_HELPER_H_
26 #include <linux/types.h>
27 #include <linux/i2c.h>
28 #include <linux/delay.h>
31 * Unless otherwise noted, all values are from the DP 1.1a spec. Note that
32 * DP and DPCD versions are independent. Differences from 1.0 are not noted,
33 * 1.0 devices basically don't exist in the wild.
35 * Abbreviations, in chronological order:
37 * eDP: Embedded DisplayPort version 1
38 * DPI: DisplayPort Interoperability Guideline v1.1a
39 * 1.2: DisplayPort 1.2
41 * 1.2 formally includes both eDP and DPI definitions.
44 #define AUX_NATIVE_WRITE 0x8
45 #define AUX_NATIVE_READ 0x9
46 #define AUX_I2C_WRITE 0x0
47 #define AUX_I2C_READ 0x1
48 #define AUX_I2C_STATUS 0x2
49 #define AUX_I2C_MOT 0x4
51 #define AUX_NATIVE_REPLY_ACK (0x0 << 4)
52 #define AUX_NATIVE_REPLY_NACK (0x1 << 4)
53 #define AUX_NATIVE_REPLY_DEFER (0x2 << 4)
54 #define AUX_NATIVE_REPLY_MASK (0x3 << 4)
56 #define AUX_I2C_REPLY_ACK (0x0 << 6)
57 #define AUX_I2C_REPLY_NACK (0x1 << 6)
58 #define AUX_I2C_REPLY_DEFER (0x2 << 6)
59 #define AUX_I2C_REPLY_MASK (0x3 << 6)
61 /* AUX CH addresses */
63 #define DP_DPCD_REV 0x000
65 #define DP_MAX_LINK_RATE 0x001
67 #define DP_MAX_LANE_COUNT 0x002
68 # define DP_MAX_LANE_COUNT_MASK 0x1f
69 # define DP_TPS3_SUPPORTED (1 << 6) /* 1.2 */
70 # define DP_ENHANCED_FRAME_CAP (1 << 7)
72 #define DP_MAX_DOWNSPREAD 0x003
73 # define DP_NO_AUX_HANDSHAKE_LINK_TRAINING (1 << 6)
77 #define DP_DOWNSTREAMPORT_PRESENT 0x005
78 # define DP_DWN_STRM_PORT_PRESENT (1 << 0)
79 # define DP_DWN_STRM_PORT_TYPE_MASK 0x06
80 # define DP_DWN_STRM_PORT_TYPE_DP (0 << 1)
81 # define DP_DWN_STRM_PORT_TYPE_ANALOG (1 << 1)
82 # define DP_DWN_STRM_PORT_TYPE_TMDS (2 << 1)
83 # define DP_DWN_STRM_PORT_TYPE_OTHER (3 << 1)
84 # define DP_FORMAT_CONVERSION (1 << 3)
85 # define DP_DETAILED_CAP_INFO_AVAILABLE (1 << 4) /* DPI */
87 #define DP_MAIN_LINK_CHANNEL_CODING 0x006
89 #define DP_DOWN_STREAM_PORT_COUNT 0x007
90 # define DP_PORT_COUNT_MASK 0x0f
91 # define DP_MSA_TIMING_PAR_IGNORED (1 << 6) /* eDP */
92 # define DP_OUI_SUPPORT (1 << 7)
94 #define DP_I2C_SPEED_CAP 0x00c /* DPI */
95 # define DP_I2C_SPEED_1K 0x01
96 # define DP_I2C_SPEED_5K 0x02
97 # define DP_I2C_SPEED_10K 0x04
98 # define DP_I2C_SPEED_100K 0x08
99 # define DP_I2C_SPEED_400K 0x10
100 # define DP_I2C_SPEED_1M 0x20
102 #define DP_EDP_CONFIGURATION_CAP 0x00d /* XXX 1.2? */
103 #define DP_TRAINING_AUX_RD_INTERVAL 0x00e /* XXX 1.2? */
105 /* Multiple stream transport */
106 #define DP_MSTM_CAP 0x021 /* 1.2 */
107 # define DP_MST_CAP (1 << 0)
109 #define DP_PSR_SUPPORT 0x070 /* XXX 1.2? */
110 # define DP_PSR_IS_SUPPORTED 1
111 #define DP_PSR_CAPS 0x071 /* XXX 1.2? */
112 # define DP_PSR_NO_TRAIN_ON_EXIT 1
113 # define DP_PSR_SETUP_TIME_330 (0 << 1)
114 # define DP_PSR_SETUP_TIME_275 (1 << 1)
115 # define DP_PSR_SETUP_TIME_220 (2 << 1)
116 # define DP_PSR_SETUP_TIME_165 (3 << 1)
117 # define DP_PSR_SETUP_TIME_110 (4 << 1)
118 # define DP_PSR_SETUP_TIME_55 (5 << 1)
119 # define DP_PSR_SETUP_TIME_0 (6 << 1)
120 # define DP_PSR_SETUP_TIME_MASK (7 << 1)
121 # define DP_PSR_SETUP_TIME_SHIFT 1
124 * 0x80-0x8f describe downstream port capabilities, but there are two layouts
125 * based on whether DP_DETAILED_CAP_INFO_AVAILABLE was set. If it was not,
126 * each port's descriptor is one byte wide. If it was set, each port's is
127 * four bytes wide, starting with the one byte from the base info. As of
128 * DP interop v1.1a only VGA defines additional detail.
132 #define DP_DOWNSTREAM_PORT_0 0x80
133 # define DP_DS_PORT_TYPE_MASK (7 << 0)
134 # define DP_DS_PORT_TYPE_DP 0
135 # define DP_DS_PORT_TYPE_VGA 1
136 # define DP_DS_PORT_TYPE_DVI 2
137 # define DP_DS_PORT_TYPE_HDMI 3
138 # define DP_DS_PORT_TYPE_NON_EDID 4
139 # define DP_DS_PORT_HPD (1 << 3)
140 /* offset 1 for VGA is maximum megapixels per second / 8 */
142 # define DP_DS_VGA_MAX_BPC_MASK (3 << 0)
143 # define DP_DS_VGA_8BPC 0
144 # define DP_DS_VGA_10BPC 1
145 # define DP_DS_VGA_12BPC 2
146 # define DP_DS_VGA_16BPC 3
148 /* link configuration */
149 #define DP_LINK_BW_SET 0x100
150 # define DP_LINK_BW_1_62 0x06
151 # define DP_LINK_BW_2_7 0x0a
152 # define DP_LINK_BW_5_4 0x14 /* 1.2 */
154 #define DP_LANE_COUNT_SET 0x101
155 # define DP_LANE_COUNT_MASK 0x0f
156 # define DP_LANE_COUNT_ENHANCED_FRAME_EN (1 << 7)
158 #define DP_TRAINING_PATTERN_SET 0x102
159 # define DP_TRAINING_PATTERN_DISABLE 0
160 # define DP_TRAINING_PATTERN_1 1
161 # define DP_TRAINING_PATTERN_2 2
162 # define DP_TRAINING_PATTERN_3 3 /* 1.2 */
163 # define DP_TRAINING_PATTERN_MASK 0x3
165 # define DP_LINK_QUAL_PATTERN_DISABLE (0 << 2)
166 # define DP_LINK_QUAL_PATTERN_D10_2 (1 << 2)
167 # define DP_LINK_QUAL_PATTERN_ERROR_RATE (2 << 2)
168 # define DP_LINK_QUAL_PATTERN_PRBS7 (3 << 2)
169 # define DP_LINK_QUAL_PATTERN_MASK (3 << 2)
171 # define DP_RECOVERED_CLOCK_OUT_EN (1 << 4)
172 # define DP_LINK_SCRAMBLING_DISABLE (1 << 5)
174 # define DP_SYMBOL_ERROR_COUNT_BOTH (0 << 6)
175 # define DP_SYMBOL_ERROR_COUNT_DISPARITY (1 << 6)
176 # define DP_SYMBOL_ERROR_COUNT_SYMBOL (2 << 6)
177 # define DP_SYMBOL_ERROR_COUNT_MASK (3 << 6)
179 #define DP_TRAINING_LANE0_SET 0x103
180 #define DP_TRAINING_LANE1_SET 0x104
181 #define DP_TRAINING_LANE2_SET 0x105
182 #define DP_TRAINING_LANE3_SET 0x106
184 # define DP_TRAIN_VOLTAGE_SWING_MASK 0x3
185 # define DP_TRAIN_VOLTAGE_SWING_SHIFT 0
186 # define DP_TRAIN_MAX_SWING_REACHED (1 << 2)
187 # define DP_TRAIN_VOLTAGE_SWING_400 (0 << 0)
188 # define DP_TRAIN_VOLTAGE_SWING_600 (1 << 0)
189 # define DP_TRAIN_VOLTAGE_SWING_800 (2 << 0)
190 # define DP_TRAIN_VOLTAGE_SWING_1200 (3 << 0)
192 # define DP_TRAIN_PRE_EMPHASIS_MASK (3 << 3)
193 # define DP_TRAIN_PRE_EMPHASIS_0 (0 << 3)
194 # define DP_TRAIN_PRE_EMPHASIS_3_5 (1 << 3)
195 # define DP_TRAIN_PRE_EMPHASIS_6 (2 << 3)
196 # define DP_TRAIN_PRE_EMPHASIS_9_5 (3 << 3)
198 # define DP_TRAIN_PRE_EMPHASIS_SHIFT 3
199 # define DP_TRAIN_MAX_PRE_EMPHASIS_REACHED (1 << 5)
201 #define DP_DOWNSPREAD_CTRL 0x107
202 # define DP_SPREAD_AMP_0_5 (1 << 4)
203 # define DP_MSA_TIMING_PAR_IGNORE_EN (1 << 7) /* eDP */
205 #define DP_MAIN_LINK_CHANNEL_CODING_SET 0x108
206 # define DP_SET_ANSI_8B10B (1 << 0)
208 #define DP_I2C_SPEED_CONTROL_STATUS 0x109 /* DPI */
209 /* bitmask as for DP_I2C_SPEED_CAP */
211 #define DP_EDP_CONFIGURATION_SET 0x10a /* XXX 1.2? */
213 #define DP_MSTM_CTRL 0x111 /* 1.2 */
214 # define DP_MST_EN (1 << 0)
215 # define DP_UP_REQ_EN (1 << 1)
216 # define DP_UPSTREAM_IS_SRC (1 << 2)
218 #define DP_PSR_EN_CFG 0x170 /* XXX 1.2? */
219 # define DP_PSR_ENABLE (1 << 0)
220 # define DP_PSR_MAIN_LINK_ACTIVE (1 << 1)
221 # define DP_PSR_CRC_VERIFICATION (1 << 2)
222 # define DP_PSR_FRAME_CAPTURE (1 << 3)
224 #define DP_SINK_COUNT 0x200
225 /* prior to 1.2 bit 7 was reserved mbz */
226 # define DP_GET_SINK_COUNT(x) ((((x) & 0x80) >> 1) | ((x) & 0x3f))
227 # define DP_SINK_CP_READY (1 << 6)
229 #define DP_DEVICE_SERVICE_IRQ_VECTOR 0x201
230 # define DP_REMOTE_CONTROL_COMMAND_PENDING (1 << 0)
231 # define DP_AUTOMATED_TEST_REQUEST (1 << 1)
232 # define DP_CP_IRQ (1 << 2)
233 # define DP_SINK_SPECIFIC_IRQ (1 << 6)
235 #define DP_LANE0_1_STATUS 0x202
236 #define DP_LANE2_3_STATUS 0x203
237 # define DP_LANE_CR_DONE (1 << 0)
238 # define DP_LANE_CHANNEL_EQ_DONE (1 << 1)
239 # define DP_LANE_SYMBOL_LOCKED (1 << 2)
241 #define DP_CHANNEL_EQ_BITS (DP_LANE_CR_DONE | \
242 DP_LANE_CHANNEL_EQ_DONE | \
243 DP_LANE_SYMBOL_LOCKED)
245 #define DP_LANE_ALIGN_STATUS_UPDATED 0x204
247 #define DP_INTERLANE_ALIGN_DONE (1 << 0)
248 #define DP_DOWNSTREAM_PORT_STATUS_CHANGED (1 << 6)
249 #define DP_LINK_STATUS_UPDATED (1 << 7)
251 #define DP_SINK_STATUS 0x205
253 #define DP_RECEIVE_PORT_0_STATUS (1 << 0)
254 #define DP_RECEIVE_PORT_1_STATUS (1 << 1)
256 #define DP_ADJUST_REQUEST_LANE0_1 0x206
257 #define DP_ADJUST_REQUEST_LANE2_3 0x207
258 # define DP_ADJUST_VOLTAGE_SWING_LANE0_MASK 0x03
259 # define DP_ADJUST_VOLTAGE_SWING_LANE0_SHIFT 0
260 # define DP_ADJUST_PRE_EMPHASIS_LANE0_MASK 0x0c
261 # define DP_ADJUST_PRE_EMPHASIS_LANE0_SHIFT 2
262 # define DP_ADJUST_VOLTAGE_SWING_LANE1_MASK 0x30
263 # define DP_ADJUST_VOLTAGE_SWING_LANE1_SHIFT 4
264 # define DP_ADJUST_PRE_EMPHASIS_LANE1_MASK 0xc0
265 # define DP_ADJUST_PRE_EMPHASIS_LANE1_SHIFT 6
267 #define DP_TEST_REQUEST 0x218
268 # define DP_TEST_LINK_TRAINING (1 << 0)
269 # define DP_TEST_LINK_PATTERN (1 << 1)
270 # define DP_TEST_LINK_EDID_READ (1 << 2)
271 # define DP_TEST_LINK_PHY_TEST_PATTERN (1 << 3) /* DPCD >= 1.1 */
273 #define DP_TEST_LINK_RATE 0x219
274 # define DP_LINK_RATE_162 (0x6)
275 # define DP_LINK_RATE_27 (0xa)
277 #define DP_TEST_LANE_COUNT 0x220
279 #define DP_TEST_PATTERN 0x221
281 #define DP_TEST_RESPONSE 0x260
282 # define DP_TEST_ACK (1 << 0)
283 # define DP_TEST_NAK (1 << 1)
284 # define DP_TEST_EDID_CHECKSUM_WRITE (1 << 2)
286 #define DP_SOURCE_OUI 0x300
287 #define DP_SINK_OUI 0x400
288 #define DP_BRANCH_OUI 0x500
290 #define DP_SET_POWER 0x600
291 # define DP_SET_POWER_D0 0x1
292 # define DP_SET_POWER_D3 0x2
294 #define DP_PSR_ERROR_STATUS 0x2006 /* XXX 1.2? */
295 # define DP_PSR_LINK_CRC_ERROR (1 << 0)
296 # define DP_PSR_RFB_STORAGE_ERROR (1 << 1)
298 #define DP_PSR_ESI 0x2007 /* XXX 1.2? */
299 # define DP_PSR_CAPS_CHANGE (1 << 0)
301 #define DP_PSR_STATUS 0x2008 /* XXX 1.2? */
302 # define DP_PSR_SINK_INACTIVE 0
303 # define DP_PSR_SINK_ACTIVE_SRC_SYNCED 1
304 # define DP_PSR_SINK_ACTIVE_RFB 2
305 # define DP_PSR_SINK_ACTIVE_SINK_SYNCED 3
306 # define DP_PSR_SINK_ACTIVE_RESYNC 4
307 # define DP_PSR_SINK_INTERNAL_ERROR 7
308 # define DP_PSR_SINK_STATE_MASK 0x07
310 #define MODE_I2C_START 1
311 #define MODE_I2C_WRITE 2
312 #define MODE_I2C_READ 4
313 #define MODE_I2C_STOP 8
316 * struct i2c_algo_dp_aux_data - driver interface structure for i2c over dp
318 * @running: set by the algo indicating whether an i2c is ongoing or whether
319 * the i2c bus is quiescent
320 * @address: i2c target address for the currently ongoing transfer
321 * @aux_ch: driver callback to transfer a single byte of the i2c payload
323 struct i2c_algo_dp_aux_data {
326 int (*aux_ch) (struct i2c_adapter *adapter,
327 int mode, uint8_t write_byte,
332 i2c_dp_aux_add_bus(struct i2c_adapter *adapter);
335 #define DP_LINK_STATUS_SIZE 6
336 bool drm_dp_channel_eq_ok(const u8 link_status[DP_LINK_STATUS_SIZE],
338 bool drm_dp_clock_recovery_ok(const u8 link_status[DP_LINK_STATUS_SIZE],
340 u8 drm_dp_get_adjust_request_voltage(const u8 link_status[DP_LINK_STATUS_SIZE],
342 u8 drm_dp_get_adjust_request_pre_emphasis(const u8 link_status[DP_LINK_STATUS_SIZE],
345 #define DP_RECEIVER_CAP_SIZE 0xf
346 #define EDP_PSR_RECEIVER_CAP_SIZE 2
348 void drm_dp_link_train_clock_recovery_delay(const u8 dpcd[DP_RECEIVER_CAP_SIZE]);
349 void drm_dp_link_train_channel_eq_delay(const u8 dpcd[DP_RECEIVER_CAP_SIZE]);
351 u8 drm_dp_link_rate_to_bw_code(int link_rate);
352 int drm_dp_bw_code_to_link_rate(u8 link_bw);
354 struct edp_sdp_header {
355 u8 HB0; /* Secondary Data Packet ID */
356 u8 HB1; /* Secondary Data Packet Type */
357 u8 HB2; /* 7:5 reserved, 4:0 revision number */
358 u8 HB3; /* 7:5 reserved, 4:0 number of valid data bytes */
361 #define EDP_SDP_HEADER_REVISION_MASK 0x1F
362 #define EDP_SDP_HEADER_VALID_PAYLOAD_BYTES 0x1F
365 struct edp_sdp_header sdp_header;
366 u8 DB0; /* Stereo Interface */
367 u8 DB1; /* 0 - PSR State; 1 - Update RFB; 2 - CRC Valid */
368 u8 DB2; /* CRC value bits 7:0 of the R or Cr component */
369 u8 DB3; /* CRC value bits 15:8 of the R or Cr component */
370 u8 DB4; /* CRC value bits 7:0 of the G or Y component */
371 u8 DB5; /* CRC value bits 15:8 of the G or Y component */
372 u8 DB6; /* CRC value bits 7:0 of the B or Cb component */
373 u8 DB7; /* CRC value bits 15:8 of the B or Cb component */
374 u8 DB8_31[24]; /* Reserved */
377 #define EDP_VSC_PSR_STATE_ACTIVE (1<<0)
378 #define EDP_VSC_PSR_UPDATE_RFB (1<<1)
379 #define EDP_VSC_PSR_CRC_VALUES_VALID (1<<2)
382 drm_dp_max_link_rate(const u8 dpcd[DP_RECEIVER_CAP_SIZE])
384 return drm_dp_bw_code_to_link_rate(dpcd[DP_MAX_LINK_RATE]);
388 drm_dp_max_lane_count(const u8 dpcd[DP_RECEIVER_CAP_SIZE])
390 return dpcd[DP_MAX_LANE_COUNT] & DP_MAX_LANE_COUNT_MASK;
394 drm_dp_enhanced_frame_cap(const u8 dpcd[DP_RECEIVER_CAP_SIZE])
396 return dpcd[DP_DPCD_REV] >= 0x11 &&
397 (dpcd[DP_MAX_LANE_COUNT] & DP_ENHANCED_FRAME_CAP);
400 #endif /* _DRM_DP_HELPER_H_ */