Jingoo Han | e9474be | 2012-02-03 18:01:55 +0900 | [diff] [blame] | 1 | /* |
| 2 | * Samsung SoC DP (Display Port) interface driver. |
| 3 | * |
| 4 | * Copyright (C) 2012 Samsung Electronics Co., Ltd. |
| 5 | * Author: Jingoo Han <jg1.han@samsung.com> |
| 6 | * |
| 7 | * This program is free software; you can redistribute it and/or modify it |
| 8 | * under the terms of the GNU General Public License as published by the |
| 9 | * Free Software Foundation; either version 2 of the License, or (at your |
| 10 | * option) any later version. |
| 11 | */ |
| 12 | |
| 13 | #include <linux/module.h> |
| 14 | #include <linux/platform_device.h> |
| 15 | #include <linux/slab.h> |
| 16 | #include <linux/err.h> |
| 17 | #include <linux/clk.h> |
| 18 | #include <linux/io.h> |
| 19 | #include <linux/interrupt.h> |
| 20 | #include <linux/delay.h> |
Ajay Kumar | c4e235c | 2012-10-13 05:48:00 +0900 | [diff] [blame] | 21 | #include <linux/of.h> |
Jingoo Han | e9474be | 2012-02-03 18:01:55 +0900 | [diff] [blame] | 22 | |
| 23 | #include <video/exynos_dp.h> |
| 24 | |
Jingoo Han | e9474be | 2012-02-03 18:01:55 +0900 | [diff] [blame] | 25 | #include "exynos_dp_core.h" |
| 26 | |
| 27 | static int exynos_dp_init_dp(struct exynos_dp_device *dp) |
| 28 | { |
| 29 | exynos_dp_reset(dp); |
| 30 | |
Jingoo Han | 24db03a | 2012-05-25 16:21:08 +0900 | [diff] [blame] | 31 | exynos_dp_swreset(dp); |
| 32 | |
Jingoo Han | 75435c7 | 2012-08-23 19:55:13 +0900 | [diff] [blame] | 33 | exynos_dp_init_analog_param(dp); |
| 34 | exynos_dp_init_interrupt(dp); |
| 35 | |
Jingoo Han | e9474be | 2012-02-03 18:01:55 +0900 | [diff] [blame] | 36 | /* SW defined function Normal operation */ |
| 37 | exynos_dp_enable_sw_function(dp); |
| 38 | |
| 39 | exynos_dp_config_interrupt(dp); |
| 40 | exynos_dp_init_analog_func(dp); |
| 41 | |
| 42 | exynos_dp_init_hpd(dp); |
| 43 | exynos_dp_init_aux(dp); |
| 44 | |
| 45 | return 0; |
| 46 | } |
| 47 | |
| 48 | static int exynos_dp_detect_hpd(struct exynos_dp_device *dp) |
| 49 | { |
| 50 | int timeout_loop = 0; |
| 51 | |
Jingoo Han | e9474be | 2012-02-03 18:01:55 +0900 | [diff] [blame] | 52 | while (exynos_dp_get_plug_in_status(dp) != 0) { |
| 53 | timeout_loop++; |
| 54 | if (DP_TIMEOUT_LOOP_COUNT < timeout_loop) { |
| 55 | dev_err(dp->dev, "failed to get hpd plug status\n"); |
| 56 | return -ETIMEDOUT; |
| 57 | } |
Jingoo Han | a2c81bc | 2012-07-18 18:50:59 +0900 | [diff] [blame] | 58 | usleep_range(10, 11); |
Jingoo Han | e9474be | 2012-02-03 18:01:55 +0900 | [diff] [blame] | 59 | } |
| 60 | |
| 61 | return 0; |
| 62 | } |
| 63 | |
| 64 | static unsigned char exynos_dp_calc_edid_check_sum(unsigned char *edid_data) |
| 65 | { |
| 66 | int i; |
| 67 | unsigned char sum = 0; |
| 68 | |
| 69 | for (i = 0; i < EDID_BLOCK_LENGTH; i++) |
| 70 | sum = sum + edid_data[i]; |
| 71 | |
| 72 | return sum; |
| 73 | } |
| 74 | |
| 75 | static int exynos_dp_read_edid(struct exynos_dp_device *dp) |
| 76 | { |
| 77 | unsigned char edid[EDID_BLOCK_LENGTH * 2]; |
| 78 | unsigned int extend_block = 0; |
| 79 | unsigned char sum; |
| 80 | unsigned char test_vector; |
| 81 | int retval; |
| 82 | |
| 83 | /* |
| 84 | * EDID device address is 0x50. |
| 85 | * However, if necessary, you must have set upper address |
| 86 | * into E-EDID in I2C device, 0x30. |
| 87 | */ |
| 88 | |
| 89 | /* Read Extension Flag, Number of 128-byte EDID extension blocks */ |
Sean Paul | 99f5415 | 2012-11-01 02:13:00 +0000 | [diff] [blame] | 90 | retval = exynos_dp_read_byte_from_i2c(dp, I2C_EDID_DEVICE_ADDR, |
Jingoo Han | e9474be | 2012-02-03 18:01:55 +0900 | [diff] [blame] | 91 | EDID_EXTENSION_FLAG, |
| 92 | &extend_block); |
Sean Paul | 99f5415 | 2012-11-01 02:13:00 +0000 | [diff] [blame] | 93 | if (retval) |
| 94 | return retval; |
Jingoo Han | e9474be | 2012-02-03 18:01:55 +0900 | [diff] [blame] | 95 | |
| 96 | if (extend_block > 0) { |
| 97 | dev_dbg(dp->dev, "EDID data includes a single extension!\n"); |
| 98 | |
| 99 | /* Read EDID data */ |
| 100 | retval = exynos_dp_read_bytes_from_i2c(dp, I2C_EDID_DEVICE_ADDR, |
| 101 | EDID_HEADER_PATTERN, |
| 102 | EDID_BLOCK_LENGTH, |
| 103 | &edid[EDID_HEADER_PATTERN]); |
| 104 | if (retval != 0) { |
| 105 | dev_err(dp->dev, "EDID Read failed!\n"); |
| 106 | return -EIO; |
| 107 | } |
| 108 | sum = exynos_dp_calc_edid_check_sum(edid); |
| 109 | if (sum != 0) { |
| 110 | dev_err(dp->dev, "EDID bad checksum!\n"); |
| 111 | return -EIO; |
| 112 | } |
| 113 | |
| 114 | /* Read additional EDID data */ |
| 115 | retval = exynos_dp_read_bytes_from_i2c(dp, |
| 116 | I2C_EDID_DEVICE_ADDR, |
| 117 | EDID_BLOCK_LENGTH, |
| 118 | EDID_BLOCK_LENGTH, |
| 119 | &edid[EDID_BLOCK_LENGTH]); |
| 120 | if (retval != 0) { |
| 121 | dev_err(dp->dev, "EDID Read failed!\n"); |
| 122 | return -EIO; |
| 123 | } |
| 124 | sum = exynos_dp_calc_edid_check_sum(&edid[EDID_BLOCK_LENGTH]); |
| 125 | if (sum != 0) { |
| 126 | dev_err(dp->dev, "EDID bad checksum!\n"); |
| 127 | return -EIO; |
| 128 | } |
| 129 | |
| 130 | exynos_dp_read_byte_from_dpcd(dp, DPCD_ADDR_TEST_REQUEST, |
| 131 | &test_vector); |
| 132 | if (test_vector & DPCD_TEST_EDID_READ) { |
| 133 | exynos_dp_write_byte_to_dpcd(dp, |
| 134 | DPCD_ADDR_TEST_EDID_CHECKSUM, |
| 135 | edid[EDID_BLOCK_LENGTH + EDID_CHECKSUM]); |
| 136 | exynos_dp_write_byte_to_dpcd(dp, |
| 137 | DPCD_ADDR_TEST_RESPONSE, |
| 138 | DPCD_TEST_EDID_CHECKSUM_WRITE); |
| 139 | } |
| 140 | } else { |
| 141 | dev_info(dp->dev, "EDID data does not include any extensions.\n"); |
| 142 | |
| 143 | /* Read EDID data */ |
| 144 | retval = exynos_dp_read_bytes_from_i2c(dp, |
| 145 | I2C_EDID_DEVICE_ADDR, |
| 146 | EDID_HEADER_PATTERN, |
| 147 | EDID_BLOCK_LENGTH, |
| 148 | &edid[EDID_HEADER_PATTERN]); |
| 149 | if (retval != 0) { |
| 150 | dev_err(dp->dev, "EDID Read failed!\n"); |
| 151 | return -EIO; |
| 152 | } |
| 153 | sum = exynos_dp_calc_edid_check_sum(edid); |
| 154 | if (sum != 0) { |
| 155 | dev_err(dp->dev, "EDID bad checksum!\n"); |
| 156 | return -EIO; |
| 157 | } |
| 158 | |
| 159 | exynos_dp_read_byte_from_dpcd(dp, |
| 160 | DPCD_ADDR_TEST_REQUEST, |
| 161 | &test_vector); |
| 162 | if (test_vector & DPCD_TEST_EDID_READ) { |
| 163 | exynos_dp_write_byte_to_dpcd(dp, |
| 164 | DPCD_ADDR_TEST_EDID_CHECKSUM, |
| 165 | edid[EDID_CHECKSUM]); |
| 166 | exynos_dp_write_byte_to_dpcd(dp, |
| 167 | DPCD_ADDR_TEST_RESPONSE, |
| 168 | DPCD_TEST_EDID_CHECKSUM_WRITE); |
| 169 | } |
| 170 | } |
| 171 | |
| 172 | dev_err(dp->dev, "EDID Read success!\n"); |
| 173 | return 0; |
| 174 | } |
| 175 | |
| 176 | static int exynos_dp_handle_edid(struct exynos_dp_device *dp) |
| 177 | { |
| 178 | u8 buf[12]; |
| 179 | int i; |
| 180 | int retval; |
| 181 | |
| 182 | /* Read DPCD DPCD_ADDR_DPCD_REV~RECEIVE_PORT1_CAP_1 */ |
Sean Paul | 99f5415 | 2012-11-01 02:13:00 +0000 | [diff] [blame] | 183 | retval = exynos_dp_read_bytes_from_dpcd(dp, DPCD_ADDR_DPCD_REV, |
| 184 | 12, buf); |
| 185 | if (retval) |
| 186 | return retval; |
Jingoo Han | e9474be | 2012-02-03 18:01:55 +0900 | [diff] [blame] | 187 | |
| 188 | /* Read EDID */ |
| 189 | for (i = 0; i < 3; i++) { |
| 190 | retval = exynos_dp_read_edid(dp); |
Sean Paul | 99f5415 | 2012-11-01 02:13:00 +0000 | [diff] [blame] | 191 | if (!retval) |
Jingoo Han | e9474be | 2012-02-03 18:01:55 +0900 | [diff] [blame] | 192 | break; |
| 193 | } |
| 194 | |
| 195 | return retval; |
| 196 | } |
| 197 | |
| 198 | static void exynos_dp_enable_rx_to_enhanced_mode(struct exynos_dp_device *dp, |
| 199 | bool enable) |
| 200 | { |
| 201 | u8 data; |
| 202 | |
| 203 | exynos_dp_read_byte_from_dpcd(dp, DPCD_ADDR_LANE_COUNT_SET, &data); |
| 204 | |
| 205 | if (enable) |
| 206 | exynos_dp_write_byte_to_dpcd(dp, DPCD_ADDR_LANE_COUNT_SET, |
| 207 | DPCD_ENHANCED_FRAME_EN | |
| 208 | DPCD_LANE_COUNT_SET(data)); |
| 209 | else |
| 210 | exynos_dp_write_byte_to_dpcd(dp, DPCD_ADDR_LANE_COUNT_SET, |
| 211 | DPCD_LANE_COUNT_SET(data)); |
| 212 | } |
| 213 | |
| 214 | static int exynos_dp_is_enhanced_mode_available(struct exynos_dp_device *dp) |
| 215 | { |
| 216 | u8 data; |
| 217 | int retval; |
| 218 | |
| 219 | exynos_dp_read_byte_from_dpcd(dp, DPCD_ADDR_MAX_LANE_COUNT, &data); |
| 220 | retval = DPCD_ENHANCED_FRAME_CAP(data); |
| 221 | |
| 222 | return retval; |
| 223 | } |
| 224 | |
| 225 | static void exynos_dp_set_enhanced_mode(struct exynos_dp_device *dp) |
| 226 | { |
| 227 | u8 data; |
| 228 | |
| 229 | data = exynos_dp_is_enhanced_mode_available(dp); |
| 230 | exynos_dp_enable_rx_to_enhanced_mode(dp, data); |
| 231 | exynos_dp_enable_enhanced_mode(dp, data); |
| 232 | } |
| 233 | |
| 234 | static void exynos_dp_training_pattern_dis(struct exynos_dp_device *dp) |
| 235 | { |
| 236 | exynos_dp_set_training_pattern(dp, DP_NONE); |
| 237 | |
| 238 | exynos_dp_write_byte_to_dpcd(dp, |
| 239 | DPCD_ADDR_TRAINING_PATTERN_SET, |
| 240 | DPCD_TRAINING_PATTERN_DISABLED); |
| 241 | } |
| 242 | |
| 243 | static void exynos_dp_set_lane_lane_pre_emphasis(struct exynos_dp_device *dp, |
| 244 | int pre_emphasis, int lane) |
| 245 | { |
| 246 | switch (lane) { |
| 247 | case 0: |
| 248 | exynos_dp_set_lane0_pre_emphasis(dp, pre_emphasis); |
| 249 | break; |
| 250 | case 1: |
| 251 | exynos_dp_set_lane1_pre_emphasis(dp, pre_emphasis); |
| 252 | break; |
| 253 | |
| 254 | case 2: |
| 255 | exynos_dp_set_lane2_pre_emphasis(dp, pre_emphasis); |
| 256 | break; |
| 257 | |
| 258 | case 3: |
| 259 | exynos_dp_set_lane3_pre_emphasis(dp, pre_emphasis); |
| 260 | break; |
| 261 | } |
| 262 | } |
| 263 | |
Sean Paul | ace2d7f | 2012-10-31 23:21:00 +0000 | [diff] [blame] | 264 | static int exynos_dp_link_start(struct exynos_dp_device *dp) |
Jingoo Han | e9474be | 2012-02-03 18:01:55 +0900 | [diff] [blame] | 265 | { |
Jingoo Han | d5c0eed | 2012-07-19 13:52:59 +0900 | [diff] [blame] | 266 | u8 buf[4]; |
Sean Paul | 49ce41f | 2012-10-31 23:21:00 +0000 | [diff] [blame] | 267 | int lane, lane_count, pll_tries, retval; |
Jingoo Han | e9474be | 2012-02-03 18:01:55 +0900 | [diff] [blame] | 268 | |
| 269 | lane_count = dp->link_train.lane_count; |
| 270 | |
| 271 | dp->link_train.lt_state = CLOCK_RECOVERY; |
| 272 | dp->link_train.eq_loop = 0; |
| 273 | |
| 274 | for (lane = 0; lane < lane_count; lane++) |
| 275 | dp->link_train.cr_loop[lane] = 0; |
| 276 | |
Jingoo Han | e9474be | 2012-02-03 18:01:55 +0900 | [diff] [blame] | 277 | /* Set link rate and count as you want to establish*/ |
| 278 | exynos_dp_set_link_bandwidth(dp, dp->link_train.link_rate); |
| 279 | exynos_dp_set_lane_count(dp, dp->link_train.lane_count); |
| 280 | |
| 281 | /* Setup RX configuration */ |
| 282 | buf[0] = dp->link_train.link_rate; |
| 283 | buf[1] = dp->link_train.lane_count; |
Sean Paul | ace2d7f | 2012-10-31 23:21:00 +0000 | [diff] [blame] | 284 | retval = exynos_dp_write_bytes_to_dpcd(dp, DPCD_ADDR_LINK_BW_SET, |
Jingoo Han | e9474be | 2012-02-03 18:01:55 +0900 | [diff] [blame] | 285 | 2, buf); |
Sean Paul | ace2d7f | 2012-10-31 23:21:00 +0000 | [diff] [blame] | 286 | if (retval) |
| 287 | return retval; |
Jingoo Han | e9474be | 2012-02-03 18:01:55 +0900 | [diff] [blame] | 288 | |
| 289 | /* Set TX pre-emphasis to minimum */ |
| 290 | for (lane = 0; lane < lane_count; lane++) |
| 291 | exynos_dp_set_lane_lane_pre_emphasis(dp, |
| 292 | PRE_EMPHASIS_LEVEL_0, lane); |
| 293 | |
Sean Paul | 49ce41f | 2012-10-31 23:21:00 +0000 | [diff] [blame] | 294 | /* Wait for PLL lock */ |
| 295 | pll_tries = 0; |
| 296 | while (exynos_dp_get_pll_lock_status(dp) == PLL_UNLOCKED) { |
| 297 | if (pll_tries == DP_TIMEOUT_LOOP_COUNT) { |
| 298 | dev_err(dp->dev, "Wait for PLL lock timed out\n"); |
| 299 | return -ETIMEDOUT; |
| 300 | } |
| 301 | |
| 302 | pll_tries++; |
| 303 | usleep_range(90, 120); |
| 304 | } |
| 305 | |
Jingoo Han | e9474be | 2012-02-03 18:01:55 +0900 | [diff] [blame] | 306 | /* Set training pattern 1 */ |
| 307 | exynos_dp_set_training_pattern(dp, TRAINING_PTN1); |
| 308 | |
| 309 | /* Set RX training pattern */ |
Sean Paul | fadec4b | 2012-10-31 23:21:00 +0000 | [diff] [blame] | 310 | retval = exynos_dp_write_byte_to_dpcd(dp, |
| 311 | DPCD_ADDR_TRAINING_PATTERN_SET, |
| 312 | DPCD_SCRAMBLING_DISABLED | DPCD_TRAINING_PATTERN_1); |
| 313 | if (retval) |
| 314 | return retval; |
Jingoo Han | e9474be | 2012-02-03 18:01:55 +0900 | [diff] [blame] | 315 | |
| 316 | for (lane = 0; lane < lane_count; lane++) |
| 317 | buf[lane] = DPCD_PRE_EMPHASIS_PATTERN2_LEVEL0 | |
| 318 | DPCD_VOLTAGE_SWING_PATTERN1_LEVEL0; |
Sean Paul | fadec4b | 2012-10-31 23:21:00 +0000 | [diff] [blame] | 319 | |
| 320 | retval = exynos_dp_write_bytes_to_dpcd(dp, DPCD_ADDR_TRAINING_LANE0_SET, |
| 321 | lane_count, buf); |
Sean Paul | ace2d7f | 2012-10-31 23:21:00 +0000 | [diff] [blame] | 322 | |
| 323 | return retval; |
Jingoo Han | e9474be | 2012-02-03 18:01:55 +0900 | [diff] [blame] | 324 | } |
| 325 | |
Jingoo Han | d5c0eed | 2012-07-19 13:52:59 +0900 | [diff] [blame] | 326 | static unsigned char exynos_dp_get_lane_status(u8 link_status[2], int lane) |
Jingoo Han | e9474be | 2012-02-03 18:01:55 +0900 | [diff] [blame] | 327 | { |
| 328 | int shift = (lane & 1) * 4; |
| 329 | u8 link_value = link_status[lane>>1]; |
| 330 | |
| 331 | return (link_value >> shift) & 0xf; |
| 332 | } |
| 333 | |
Jingoo Han | d5c0eed | 2012-07-19 13:52:59 +0900 | [diff] [blame] | 334 | static int exynos_dp_clock_recovery_ok(u8 link_status[2], int lane_count) |
Jingoo Han | e9474be | 2012-02-03 18:01:55 +0900 | [diff] [blame] | 335 | { |
| 336 | int lane; |
| 337 | u8 lane_status; |
| 338 | |
| 339 | for (lane = 0; lane < lane_count; lane++) { |
| 340 | lane_status = exynos_dp_get_lane_status(link_status, lane); |
| 341 | if ((lane_status & DPCD_LANE_CR_DONE) == 0) |
| 342 | return -EINVAL; |
| 343 | } |
| 344 | return 0; |
| 345 | } |
| 346 | |
Sean Paul | fadec4b | 2012-10-31 23:21:00 +0000 | [diff] [blame] | 347 | static int exynos_dp_channel_eq_ok(u8 link_status[2], u8 link_align, |
| 348 | int lane_count) |
Jingoo Han | e9474be | 2012-02-03 18:01:55 +0900 | [diff] [blame] | 349 | { |
| 350 | int lane; |
Jingoo Han | e9474be | 2012-02-03 18:01:55 +0900 | [diff] [blame] | 351 | u8 lane_status; |
| 352 | |
Sean Paul | fadec4b | 2012-10-31 23:21:00 +0000 | [diff] [blame] | 353 | if ((link_align & DPCD_INTERLANE_ALIGN_DONE) == 0) |
Jingoo Han | e9474be | 2012-02-03 18:01:55 +0900 | [diff] [blame] | 354 | return -EINVAL; |
| 355 | |
| 356 | for (lane = 0; lane < lane_count; lane++) { |
Sean Paul | fadec4b | 2012-10-31 23:21:00 +0000 | [diff] [blame] | 357 | lane_status = exynos_dp_get_lane_status(link_status, lane); |
Jingoo Han | e9474be | 2012-02-03 18:01:55 +0900 | [diff] [blame] | 358 | lane_status &= DPCD_CHANNEL_EQ_BITS; |
| 359 | if (lane_status != DPCD_CHANNEL_EQ_BITS) |
| 360 | return -EINVAL; |
| 361 | } |
Jingoo Han | d5c0eed | 2012-07-19 13:52:59 +0900 | [diff] [blame] | 362 | |
Jingoo Han | e9474be | 2012-02-03 18:01:55 +0900 | [diff] [blame] | 363 | return 0; |
| 364 | } |
| 365 | |
| 366 | static unsigned char exynos_dp_get_adjust_request_voltage(u8 adjust_request[2], |
| 367 | int lane) |
| 368 | { |
| 369 | int shift = (lane & 1) * 4; |
| 370 | u8 link_value = adjust_request[lane>>1]; |
| 371 | |
| 372 | return (link_value >> shift) & 0x3; |
| 373 | } |
| 374 | |
| 375 | static unsigned char exynos_dp_get_adjust_request_pre_emphasis( |
| 376 | u8 adjust_request[2], |
| 377 | int lane) |
| 378 | { |
| 379 | int shift = (lane & 1) * 4; |
| 380 | u8 link_value = adjust_request[lane>>1]; |
| 381 | |
| 382 | return ((link_value >> shift) & 0xc) >> 2; |
| 383 | } |
| 384 | |
| 385 | static void exynos_dp_set_lane_link_training(struct exynos_dp_device *dp, |
| 386 | u8 training_lane_set, int lane) |
| 387 | { |
| 388 | switch (lane) { |
| 389 | case 0: |
| 390 | exynos_dp_set_lane0_link_training(dp, training_lane_set); |
| 391 | break; |
| 392 | case 1: |
| 393 | exynos_dp_set_lane1_link_training(dp, training_lane_set); |
| 394 | break; |
| 395 | |
| 396 | case 2: |
| 397 | exynos_dp_set_lane2_link_training(dp, training_lane_set); |
| 398 | break; |
| 399 | |
| 400 | case 3: |
| 401 | exynos_dp_set_lane3_link_training(dp, training_lane_set); |
| 402 | break; |
| 403 | } |
| 404 | } |
| 405 | |
| 406 | static unsigned int exynos_dp_get_lane_link_training( |
| 407 | struct exynos_dp_device *dp, |
| 408 | int lane) |
| 409 | { |
| 410 | u32 reg; |
| 411 | |
| 412 | switch (lane) { |
| 413 | case 0: |
| 414 | reg = exynos_dp_get_lane0_link_training(dp); |
| 415 | break; |
| 416 | case 1: |
| 417 | reg = exynos_dp_get_lane1_link_training(dp); |
| 418 | break; |
| 419 | case 2: |
| 420 | reg = exynos_dp_get_lane2_link_training(dp); |
| 421 | break; |
| 422 | case 3: |
| 423 | reg = exynos_dp_get_lane3_link_training(dp); |
| 424 | break; |
Jingoo Han | 64c43df | 2012-06-20 10:25:48 +0900 | [diff] [blame] | 425 | default: |
| 426 | WARN_ON(1); |
| 427 | return 0; |
Jingoo Han | e9474be | 2012-02-03 18:01:55 +0900 | [diff] [blame] | 428 | } |
| 429 | |
| 430 | return reg; |
| 431 | } |
| 432 | |
| 433 | static void exynos_dp_reduce_link_rate(struct exynos_dp_device *dp) |
| 434 | { |
Jingoo Han | d5c0eed | 2012-07-19 13:52:59 +0900 | [diff] [blame] | 435 | exynos_dp_training_pattern_dis(dp); |
| 436 | exynos_dp_set_enhanced_mode(dp); |
Jingoo Han | e9474be | 2012-02-03 18:01:55 +0900 | [diff] [blame] | 437 | |
Jingoo Han | d5c0eed | 2012-07-19 13:52:59 +0900 | [diff] [blame] | 438 | dp->link_train.lt_state = FAILED; |
Jingoo Han | e9474be | 2012-02-03 18:01:55 +0900 | [diff] [blame] | 439 | } |
| 440 | |
Sean Paul | fadec4b | 2012-10-31 23:21:00 +0000 | [diff] [blame] | 441 | static void exynos_dp_get_adjust_training_lane(struct exynos_dp_device *dp, |
| 442 | u8 adjust_request[2]) |
| 443 | { |
| 444 | int lane, lane_count; |
| 445 | u8 voltage_swing, pre_emphasis, training_lane; |
| 446 | |
| 447 | lane_count = dp->link_train.lane_count; |
| 448 | for (lane = 0; lane < lane_count; lane++) { |
| 449 | voltage_swing = exynos_dp_get_adjust_request_voltage( |
| 450 | adjust_request, lane); |
| 451 | pre_emphasis = exynos_dp_get_adjust_request_pre_emphasis( |
| 452 | adjust_request, lane); |
| 453 | training_lane = DPCD_VOLTAGE_SWING_SET(voltage_swing) | |
| 454 | DPCD_PRE_EMPHASIS_SET(pre_emphasis); |
| 455 | |
| 456 | if (voltage_swing == VOLTAGE_LEVEL_3) |
| 457 | training_lane |= DPCD_MAX_SWING_REACHED; |
| 458 | if (pre_emphasis == PRE_EMPHASIS_LEVEL_3) |
| 459 | training_lane |= DPCD_MAX_PRE_EMPHASIS_REACHED; |
| 460 | |
| 461 | dp->link_train.training_lane[lane] = training_lane; |
| 462 | } |
| 463 | } |
| 464 | |
Jingoo Han | e9474be | 2012-02-03 18:01:55 +0900 | [diff] [blame] | 465 | static int exynos_dp_process_clock_recovery(struct exynos_dp_device *dp) |
| 466 | { |
Sean Paul | ace2d7f | 2012-10-31 23:21:00 +0000 | [diff] [blame] | 467 | int lane, lane_count, retval; |
Sean Paul | fadec4b | 2012-10-31 23:21:00 +0000 | [diff] [blame] | 468 | u8 voltage_swing, pre_emphasis, training_lane; |
| 469 | u8 link_status[2], adjust_request[2]; |
Jingoo Han | e9474be | 2012-02-03 18:01:55 +0900 | [diff] [blame] | 470 | |
Jingoo Han | a2c81bc | 2012-07-18 18:50:59 +0900 | [diff] [blame] | 471 | usleep_range(100, 101); |
Jingoo Han | e9474be | 2012-02-03 18:01:55 +0900 | [diff] [blame] | 472 | |
Jingoo Han | e9474be | 2012-02-03 18:01:55 +0900 | [diff] [blame] | 473 | lane_count = dp->link_train.lane_count; |
| 474 | |
Sean Paul | fadec4b | 2012-10-31 23:21:00 +0000 | [diff] [blame] | 475 | retval = exynos_dp_read_bytes_from_dpcd(dp, |
| 476 | DPCD_ADDR_LANE0_1_STATUS, 2, link_status); |
| 477 | if (retval) |
| 478 | return retval; |
| 479 | |
| 480 | retval = exynos_dp_read_bytes_from_dpcd(dp, |
| 481 | DPCD_ADDR_ADJUST_REQUEST_LANE0_1, 2, adjust_request); |
Sean Paul | ace2d7f | 2012-10-31 23:21:00 +0000 | [diff] [blame] | 482 | if (retval) |
| 483 | return retval; |
Jingoo Han | d5c0eed | 2012-07-19 13:52:59 +0900 | [diff] [blame] | 484 | |
Jingoo Han | e9474be | 2012-02-03 18:01:55 +0900 | [diff] [blame] | 485 | if (exynos_dp_clock_recovery_ok(link_status, lane_count) == 0) { |
| 486 | /* set training pattern 2 for EQ */ |
| 487 | exynos_dp_set_training_pattern(dp, TRAINING_PTN2); |
| 488 | |
Sean Paul | ace2d7f | 2012-10-31 23:21:00 +0000 | [diff] [blame] | 489 | retval = exynos_dp_write_byte_to_dpcd(dp, |
Sean Paul | fadec4b | 2012-10-31 23:21:00 +0000 | [diff] [blame] | 490 | DPCD_ADDR_TRAINING_PATTERN_SET, |
| 491 | DPCD_SCRAMBLING_DISABLED | |
| 492 | DPCD_TRAINING_PATTERN_2); |
Sean Paul | ace2d7f | 2012-10-31 23:21:00 +0000 | [diff] [blame] | 493 | if (retval) |
| 494 | return retval; |
Jingoo Han | d5c0eed | 2012-07-19 13:52:59 +0900 | [diff] [blame] | 495 | |
| 496 | dev_info(dp->dev, "Link Training Clock Recovery success\n"); |
| 497 | dp->link_train.lt_state = EQUALIZER_TRAINING; |
| 498 | } else { |
| 499 | for (lane = 0; lane < lane_count; lane++) { |
| 500 | training_lane = exynos_dp_get_lane_link_training( |
| 501 | dp, lane); |
Jingoo Han | d5c0eed | 2012-07-19 13:52:59 +0900 | [diff] [blame] | 502 | voltage_swing = exynos_dp_get_adjust_request_voltage( |
| 503 | adjust_request, lane); |
| 504 | pre_emphasis = exynos_dp_get_adjust_request_pre_emphasis( |
| 505 | adjust_request, lane); |
| 506 | |
Sean Paul | fadec4b | 2012-10-31 23:21:00 +0000 | [diff] [blame] | 507 | if (DPCD_VOLTAGE_SWING_GET(training_lane) == |
| 508 | voltage_swing && |
| 509 | DPCD_PRE_EMPHASIS_GET(training_lane) == |
| 510 | pre_emphasis) |
Jingoo Han | d5c0eed | 2012-07-19 13:52:59 +0900 | [diff] [blame] | 511 | dp->link_train.cr_loop[lane]++; |
Sean Paul | fadec4b | 2012-10-31 23:21:00 +0000 | [diff] [blame] | 512 | |
| 513 | if (dp->link_train.cr_loop[lane] == MAX_CR_LOOP || |
| 514 | voltage_swing == VOLTAGE_LEVEL_3 || |
| 515 | pre_emphasis == PRE_EMPHASIS_LEVEL_3) { |
| 516 | dev_err(dp->dev, "CR Max reached (%d,%d,%d)\n", |
| 517 | dp->link_train.cr_loop[lane], |
| 518 | voltage_swing, pre_emphasis); |
| 519 | exynos_dp_reduce_link_rate(dp); |
| 520 | return -EIO; |
Jingoo Han | d5c0eed | 2012-07-19 13:52:59 +0900 | [diff] [blame] | 521 | } |
Jingoo Han | e9474be | 2012-02-03 18:01:55 +0900 | [diff] [blame] | 522 | } |
| 523 | } |
| 524 | |
Sean Paul | fadec4b | 2012-10-31 23:21:00 +0000 | [diff] [blame] | 525 | exynos_dp_get_adjust_training_lane(dp, adjust_request); |
Jingoo Han | d5c0eed | 2012-07-19 13:52:59 +0900 | [diff] [blame] | 526 | |
Sean Paul | fadec4b | 2012-10-31 23:21:00 +0000 | [diff] [blame] | 527 | for (lane = 0; lane < lane_count; lane++) |
| 528 | exynos_dp_set_lane_link_training(dp, |
| 529 | dp->link_train.training_lane[lane], lane); |
| 530 | |
| 531 | retval = exynos_dp_write_bytes_to_dpcd(dp, |
| 532 | DPCD_ADDR_TRAINING_LANE0_SET, lane_count, |
| 533 | dp->link_train.training_lane); |
| 534 | if (retval) |
| 535 | return retval; |
| 536 | |
| 537 | return retval; |
Jingoo Han | e9474be | 2012-02-03 18:01:55 +0900 | [diff] [blame] | 538 | } |
| 539 | |
| 540 | static int exynos_dp_process_equalizer_training(struct exynos_dp_device *dp) |
| 541 | { |
Sean Paul | ace2d7f | 2012-10-31 23:21:00 +0000 | [diff] [blame] | 542 | int lane, lane_count, retval; |
Jingoo Han | e9474be | 2012-02-03 18:01:55 +0900 | [diff] [blame] | 543 | u32 reg; |
Sean Paul | fadec4b | 2012-10-31 23:21:00 +0000 | [diff] [blame] | 544 | u8 link_align, link_status[2], adjust_request[2]; |
Jingoo Han | e9474be | 2012-02-03 18:01:55 +0900 | [diff] [blame] | 545 | |
Jingoo Han | a2c81bc | 2012-07-18 18:50:59 +0900 | [diff] [blame] | 546 | usleep_range(400, 401); |
Jingoo Han | e9474be | 2012-02-03 18:01:55 +0900 | [diff] [blame] | 547 | |
Jingoo Han | e9474be | 2012-02-03 18:01:55 +0900 | [diff] [blame] | 548 | lane_count = dp->link_train.lane_count; |
| 549 | |
Sean Paul | fadec4b | 2012-10-31 23:21:00 +0000 | [diff] [blame] | 550 | retval = exynos_dp_read_bytes_from_dpcd(dp, |
| 551 | DPCD_ADDR_LANE0_1_STATUS, 2, link_status); |
Sean Paul | ace2d7f | 2012-10-31 23:21:00 +0000 | [diff] [blame] | 552 | if (retval) |
| 553 | return retval; |
Jingoo Han | d5c0eed | 2012-07-19 13:52:59 +0900 | [diff] [blame] | 554 | |
Sean Paul | fadec4b | 2012-10-31 23:21:00 +0000 | [diff] [blame] | 555 | if (exynos_dp_clock_recovery_ok(link_status, lane_count)) { |
| 556 | exynos_dp_reduce_link_rate(dp); |
| 557 | return -EIO; |
Jingoo Han | e9474be | 2012-02-03 18:01:55 +0900 | [diff] [blame] | 558 | } |
| 559 | |
Sean Paul | fadec4b | 2012-10-31 23:21:00 +0000 | [diff] [blame] | 560 | retval = exynos_dp_read_bytes_from_dpcd(dp, |
| 561 | DPCD_ADDR_ADJUST_REQUEST_LANE0_1, 2, adjust_request); |
| 562 | if (retval) |
| 563 | return retval; |
Jingoo Han | d5c0eed | 2012-07-19 13:52:59 +0900 | [diff] [blame] | 564 | |
Sean Paul | fadec4b | 2012-10-31 23:21:00 +0000 | [diff] [blame] | 565 | retval = exynos_dp_read_byte_from_dpcd(dp, |
| 566 | DPCD_ADDR_LANE_ALIGN_STATUS_UPDATED, &link_align); |
| 567 | if (retval) |
| 568 | return retval; |
| 569 | |
| 570 | exynos_dp_get_adjust_training_lane(dp, adjust_request); |
| 571 | |
| 572 | if (!exynos_dp_channel_eq_ok(link_status, link_align, lane_count)) { |
| 573 | /* traing pattern Set to Normal */ |
| 574 | exynos_dp_training_pattern_dis(dp); |
| 575 | |
| 576 | dev_info(dp->dev, "Link Training success!\n"); |
| 577 | |
| 578 | exynos_dp_get_link_bandwidth(dp, ®); |
| 579 | dp->link_train.link_rate = reg; |
| 580 | dev_dbg(dp->dev, "final bandwidth = %.2x\n", |
| 581 | dp->link_train.link_rate); |
| 582 | |
| 583 | exynos_dp_get_lane_count(dp, ®); |
| 584 | dp->link_train.lane_count = reg; |
| 585 | dev_dbg(dp->dev, "final lane count = %.2x\n", |
| 586 | dp->link_train.lane_count); |
| 587 | |
| 588 | /* set enhanced mode if available */ |
| 589 | exynos_dp_set_enhanced_mode(dp); |
| 590 | dp->link_train.lt_state = FINISHED; |
| 591 | |
| 592 | return 0; |
| 593 | } |
| 594 | |
| 595 | /* not all locked */ |
| 596 | dp->link_train.eq_loop++; |
| 597 | |
| 598 | if (dp->link_train.eq_loop > MAX_EQ_LOOP) { |
| 599 | dev_err(dp->dev, "EQ Max loop\n"); |
| 600 | exynos_dp_reduce_link_rate(dp); |
| 601 | return -EIO; |
| 602 | } |
| 603 | |
| 604 | for (lane = 0; lane < lane_count; lane++) |
| 605 | exynos_dp_set_lane_link_training(dp, |
| 606 | dp->link_train.training_lane[lane], lane); |
| 607 | |
| 608 | retval = exynos_dp_write_bytes_to_dpcd(dp, DPCD_ADDR_TRAINING_LANE0_SET, |
| 609 | lane_count, dp->link_train.training_lane); |
| 610 | |
| 611 | return retval; |
Jingoo Han | e9474be | 2012-02-03 18:01:55 +0900 | [diff] [blame] | 612 | } |
| 613 | |
| 614 | static void exynos_dp_get_max_rx_bandwidth(struct exynos_dp_device *dp, |
Jingoo Han | d5c0eed | 2012-07-19 13:52:59 +0900 | [diff] [blame] | 615 | u8 *bandwidth) |
Jingoo Han | e9474be | 2012-02-03 18:01:55 +0900 | [diff] [blame] | 616 | { |
| 617 | u8 data; |
| 618 | |
| 619 | /* |
| 620 | * For DP rev.1.1, Maximum link rate of Main Link lanes |
| 621 | * 0x06 = 1.62 Gbps, 0x0a = 2.7 Gbps |
| 622 | */ |
| 623 | exynos_dp_read_byte_from_dpcd(dp, DPCD_ADDR_MAX_LINK_RATE, &data); |
| 624 | *bandwidth = data; |
| 625 | } |
| 626 | |
| 627 | static void exynos_dp_get_max_rx_lane_count(struct exynos_dp_device *dp, |
Jingoo Han | d5c0eed | 2012-07-19 13:52:59 +0900 | [diff] [blame] | 628 | u8 *lane_count) |
Jingoo Han | e9474be | 2012-02-03 18:01:55 +0900 | [diff] [blame] | 629 | { |
| 630 | u8 data; |
| 631 | |
| 632 | /* |
| 633 | * For DP rev.1.1, Maximum number of Main Link lanes |
| 634 | * 0x01 = 1 lane, 0x02 = 2 lanes, 0x04 = 4 lanes |
| 635 | */ |
| 636 | exynos_dp_read_byte_from_dpcd(dp, DPCD_ADDR_MAX_LANE_COUNT, &data); |
| 637 | *lane_count = DPCD_MAX_LANE_COUNT(data); |
| 638 | } |
| 639 | |
| 640 | static void exynos_dp_init_training(struct exynos_dp_device *dp, |
| 641 | enum link_lane_count_type max_lane, |
| 642 | enum link_rate_type max_rate) |
| 643 | { |
| 644 | /* |
| 645 | * MACRO_RST must be applied after the PLL_LOCK to avoid |
| 646 | * the DP inter pair skew issue for at least 10 us |
| 647 | */ |
| 648 | exynos_dp_reset_macro(dp); |
| 649 | |
| 650 | /* Initialize by reading RX's DPCD */ |
| 651 | exynos_dp_get_max_rx_bandwidth(dp, &dp->link_train.link_rate); |
| 652 | exynos_dp_get_max_rx_lane_count(dp, &dp->link_train.lane_count); |
| 653 | |
| 654 | if ((dp->link_train.link_rate != LINK_RATE_1_62GBPS) && |
| 655 | (dp->link_train.link_rate != LINK_RATE_2_70GBPS)) { |
| 656 | dev_err(dp->dev, "Rx Max Link Rate is abnormal :%x !\n", |
| 657 | dp->link_train.link_rate); |
| 658 | dp->link_train.link_rate = LINK_RATE_1_62GBPS; |
| 659 | } |
| 660 | |
| 661 | if (dp->link_train.lane_count == 0) { |
| 662 | dev_err(dp->dev, "Rx Max Lane count is abnormal :%x !\n", |
| 663 | dp->link_train.lane_count); |
| 664 | dp->link_train.lane_count = (u8)LANE_COUNT1; |
| 665 | } |
| 666 | |
| 667 | /* Setup TX lane count & rate */ |
| 668 | if (dp->link_train.lane_count > max_lane) |
| 669 | dp->link_train.lane_count = max_lane; |
| 670 | if (dp->link_train.link_rate > max_rate) |
| 671 | dp->link_train.link_rate = max_rate; |
| 672 | |
| 673 | /* All DP analog module power up */ |
| 674 | exynos_dp_set_analog_power_down(dp, POWER_ALL, 0); |
| 675 | } |
| 676 | |
| 677 | static int exynos_dp_sw_link_training(struct exynos_dp_device *dp) |
| 678 | { |
Sean Paul | ace2d7f | 2012-10-31 23:21:00 +0000 | [diff] [blame] | 679 | int retval = 0, training_finished = 0; |
Jingoo Han | e9474be | 2012-02-03 18:01:55 +0900 | [diff] [blame] | 680 | |
| 681 | dp->link_train.lt_state = START; |
| 682 | |
| 683 | /* Process here */ |
Sean Paul | ace2d7f | 2012-10-31 23:21:00 +0000 | [diff] [blame] | 684 | while (!retval && !training_finished) { |
Jingoo Han | e9474be | 2012-02-03 18:01:55 +0900 | [diff] [blame] | 685 | switch (dp->link_train.lt_state) { |
| 686 | case START: |
Sean Paul | ace2d7f | 2012-10-31 23:21:00 +0000 | [diff] [blame] | 687 | retval = exynos_dp_link_start(dp); |
| 688 | if (retval) |
| 689 | dev_err(dp->dev, "LT link start failed!\n"); |
Jingoo Han | e9474be | 2012-02-03 18:01:55 +0900 | [diff] [blame] | 690 | break; |
| 691 | case CLOCK_RECOVERY: |
Jingoo Han | d5c0eed | 2012-07-19 13:52:59 +0900 | [diff] [blame] | 692 | retval = exynos_dp_process_clock_recovery(dp); |
| 693 | if (retval) |
| 694 | dev_err(dp->dev, "LT CR failed!\n"); |
Jingoo Han | e9474be | 2012-02-03 18:01:55 +0900 | [diff] [blame] | 695 | break; |
| 696 | case EQUALIZER_TRAINING: |
Jingoo Han | d5c0eed | 2012-07-19 13:52:59 +0900 | [diff] [blame] | 697 | retval = exynos_dp_process_equalizer_training(dp); |
| 698 | if (retval) |
| 699 | dev_err(dp->dev, "LT EQ failed!\n"); |
Jingoo Han | e9474be | 2012-02-03 18:01:55 +0900 | [diff] [blame] | 700 | break; |
| 701 | case FINISHED: |
| 702 | training_finished = 1; |
| 703 | break; |
| 704 | case FAILED: |
| 705 | return -EREMOTEIO; |
| 706 | } |
| 707 | } |
Sean Paul | ace2d7f | 2012-10-31 23:21:00 +0000 | [diff] [blame] | 708 | if (retval) |
| 709 | dev_err(dp->dev, "eDP link training failed (%d)\n", retval); |
Jingoo Han | e9474be | 2012-02-03 18:01:55 +0900 | [diff] [blame] | 710 | |
| 711 | return retval; |
| 712 | } |
| 713 | |
| 714 | static int exynos_dp_set_link_train(struct exynos_dp_device *dp, |
| 715 | u32 count, |
| 716 | u32 bwtype) |
| 717 | { |
| 718 | int i; |
| 719 | int retval; |
| 720 | |
| 721 | for (i = 0; i < DP_TIMEOUT_LOOP_COUNT; i++) { |
| 722 | exynos_dp_init_training(dp, count, bwtype); |
| 723 | retval = exynos_dp_sw_link_training(dp); |
| 724 | if (retval == 0) |
| 725 | break; |
| 726 | |
Jingoo Han | a2c81bc | 2012-07-18 18:50:59 +0900 | [diff] [blame] | 727 | usleep_range(100, 110); |
Jingoo Han | e9474be | 2012-02-03 18:01:55 +0900 | [diff] [blame] | 728 | } |
| 729 | |
| 730 | return retval; |
| 731 | } |
| 732 | |
| 733 | static int exynos_dp_config_video(struct exynos_dp_device *dp, |
| 734 | struct video_info *video_info) |
| 735 | { |
| 736 | int retval = 0; |
| 737 | int timeout_loop = 0; |
| 738 | int done_count = 0; |
| 739 | |
| 740 | exynos_dp_config_video_slave_mode(dp, video_info); |
| 741 | |
| 742 | exynos_dp_set_video_color_format(dp, video_info->color_depth, |
| 743 | video_info->color_space, |
| 744 | video_info->dynamic_range, |
| 745 | video_info->ycbcr_coeff); |
| 746 | |
| 747 | if (exynos_dp_get_pll_lock_status(dp) == PLL_UNLOCKED) { |
| 748 | dev_err(dp->dev, "PLL is not locked yet.\n"); |
| 749 | return -EINVAL; |
| 750 | } |
| 751 | |
| 752 | for (;;) { |
| 753 | timeout_loop++; |
| 754 | if (exynos_dp_is_slave_video_stream_clock_on(dp) == 0) |
| 755 | break; |
| 756 | if (DP_TIMEOUT_LOOP_COUNT < timeout_loop) { |
| 757 | dev_err(dp->dev, "Timeout of video streamclk ok\n"); |
| 758 | return -ETIMEDOUT; |
| 759 | } |
| 760 | |
Jingoo Han | a2c81bc | 2012-07-18 18:50:59 +0900 | [diff] [blame] | 761 | usleep_range(1, 2); |
Jingoo Han | e9474be | 2012-02-03 18:01:55 +0900 | [diff] [blame] | 762 | } |
| 763 | |
| 764 | /* Set to use the register calculated M/N video */ |
| 765 | exynos_dp_set_video_cr_mn(dp, CALCULATED_M, 0, 0); |
| 766 | |
| 767 | /* For video bist, Video timing must be generated by register */ |
| 768 | exynos_dp_set_video_timing_mode(dp, VIDEO_TIMING_FROM_CAPTURE); |
| 769 | |
| 770 | /* Disable video mute */ |
| 771 | exynos_dp_enable_video_mute(dp, 0); |
| 772 | |
| 773 | /* Configure video slave mode */ |
| 774 | exynos_dp_enable_video_master(dp, 0); |
| 775 | |
| 776 | /* Enable video */ |
| 777 | exynos_dp_start_video(dp); |
| 778 | |
| 779 | timeout_loop = 0; |
| 780 | |
| 781 | for (;;) { |
| 782 | timeout_loop++; |
| 783 | if (exynos_dp_is_video_stream_on(dp) == 0) { |
| 784 | done_count++; |
| 785 | if (done_count > 10) |
| 786 | break; |
| 787 | } else if (done_count) { |
| 788 | done_count = 0; |
| 789 | } |
| 790 | if (DP_TIMEOUT_LOOP_COUNT < timeout_loop) { |
| 791 | dev_err(dp->dev, "Timeout of video streamclk ok\n"); |
| 792 | return -ETIMEDOUT; |
| 793 | } |
| 794 | |
Jingoo Han | a2c81bc | 2012-07-18 18:50:59 +0900 | [diff] [blame] | 795 | usleep_range(1000, 1001); |
Jingoo Han | e9474be | 2012-02-03 18:01:55 +0900 | [diff] [blame] | 796 | } |
| 797 | |
| 798 | if (retval != 0) |
| 799 | dev_err(dp->dev, "Video stream is not detected!\n"); |
| 800 | |
| 801 | return retval; |
| 802 | } |
| 803 | |
| 804 | static void exynos_dp_enable_scramble(struct exynos_dp_device *dp, bool enable) |
| 805 | { |
| 806 | u8 data; |
| 807 | |
| 808 | if (enable) { |
| 809 | exynos_dp_enable_scrambling(dp); |
| 810 | |
| 811 | exynos_dp_read_byte_from_dpcd(dp, |
| 812 | DPCD_ADDR_TRAINING_PATTERN_SET, |
| 813 | &data); |
| 814 | exynos_dp_write_byte_to_dpcd(dp, |
| 815 | DPCD_ADDR_TRAINING_PATTERN_SET, |
| 816 | (u8)(data & ~DPCD_SCRAMBLING_DISABLED)); |
| 817 | } else { |
| 818 | exynos_dp_disable_scrambling(dp); |
| 819 | |
| 820 | exynos_dp_read_byte_from_dpcd(dp, |
| 821 | DPCD_ADDR_TRAINING_PATTERN_SET, |
| 822 | &data); |
| 823 | exynos_dp_write_byte_to_dpcd(dp, |
| 824 | DPCD_ADDR_TRAINING_PATTERN_SET, |
| 825 | (u8)(data | DPCD_SCRAMBLING_DISABLED)); |
| 826 | } |
| 827 | } |
| 828 | |
| 829 | static irqreturn_t exynos_dp_irq_handler(int irq, void *arg) |
| 830 | { |
| 831 | struct exynos_dp_device *dp = arg; |
| 832 | |
Sean Paul | c30ffb9 | 2012-11-01 19:13:46 +0900 | [diff] [blame^] | 833 | enum dp_irq_type irq_type; |
| 834 | |
| 835 | irq_type = exynos_dp_get_irq_type(dp); |
| 836 | switch (irq_type) { |
| 837 | case DP_IRQ_TYPE_HP_CABLE_IN: |
| 838 | dev_dbg(dp->dev, "Received irq - cable in\n"); |
| 839 | schedule_work(&dp->hotplug_work); |
| 840 | exynos_dp_clear_hotplug_interrupts(dp); |
| 841 | break; |
| 842 | case DP_IRQ_TYPE_HP_CABLE_OUT: |
| 843 | dev_dbg(dp->dev, "Received irq - cable out\n"); |
| 844 | exynos_dp_clear_hotplug_interrupts(dp); |
| 845 | break; |
| 846 | case DP_IRQ_TYPE_HP_CHANGE: |
| 847 | /* |
| 848 | * We get these change notifications once in a while, but there |
| 849 | * is nothing we can do with them. Just ignore it for now and |
| 850 | * only handle cable changes. |
| 851 | */ |
| 852 | dev_dbg(dp->dev, "Received irq - hotplug change; ignoring.\n"); |
| 853 | exynos_dp_clear_hotplug_interrupts(dp); |
| 854 | break; |
| 855 | default: |
| 856 | dev_err(dp->dev, "Received irq - unknown type!\n"); |
| 857 | break; |
| 858 | } |
Jingoo Han | e9474be | 2012-02-03 18:01:55 +0900 | [diff] [blame] | 859 | return IRQ_HANDLED; |
| 860 | } |
| 861 | |
Sean Paul | 784fa9a | 2012-11-09 13:55:08 +0900 | [diff] [blame] | 862 | static void exynos_dp_hotplug(struct work_struct *work) |
| 863 | { |
| 864 | struct exynos_dp_device *dp; |
| 865 | int ret; |
| 866 | |
| 867 | dp = container_of(work, struct exynos_dp_device, hotplug_work); |
| 868 | |
| 869 | ret = exynos_dp_detect_hpd(dp); |
| 870 | if (ret) { |
Sean Paul | c30ffb9 | 2012-11-01 19:13:46 +0900 | [diff] [blame^] | 871 | /* Cable has been disconnected, we're done */ |
Sean Paul | 784fa9a | 2012-11-09 13:55:08 +0900 | [diff] [blame] | 872 | return; |
| 873 | } |
| 874 | |
| 875 | ret = exynos_dp_handle_edid(dp); |
| 876 | if (ret) { |
| 877 | dev_err(dp->dev, "unable to handle edid\n"); |
| 878 | return; |
| 879 | } |
| 880 | |
| 881 | ret = exynos_dp_set_link_train(dp, dp->video_info->lane_count, |
| 882 | dp->video_info->link_rate); |
| 883 | if (ret) { |
| 884 | dev_err(dp->dev, "unable to do link train\n"); |
| 885 | return; |
| 886 | } |
| 887 | |
| 888 | exynos_dp_enable_scramble(dp, 1); |
| 889 | exynos_dp_enable_rx_to_enhanced_mode(dp, 1); |
| 890 | exynos_dp_enable_enhanced_mode(dp, 1); |
| 891 | |
| 892 | exynos_dp_set_lane_count(dp, dp->video_info->lane_count); |
| 893 | exynos_dp_set_link_bandwidth(dp, dp->video_info->link_rate); |
| 894 | |
| 895 | exynos_dp_init_video(dp); |
| 896 | ret = exynos_dp_config_video(dp, dp->video_info); |
| 897 | if (ret) |
| 898 | dev_err(dp->dev, "unable to config video\n"); |
| 899 | } |
| 900 | |
Ajay Kumar | c4e235c | 2012-10-13 05:48:00 +0900 | [diff] [blame] | 901 | #ifdef CONFIG_OF |
| 902 | static struct exynos_dp_platdata *exynos_dp_dt_parse_pdata(struct device *dev) |
| 903 | { |
| 904 | struct device_node *dp_node = dev->of_node; |
| 905 | struct exynos_dp_platdata *pd; |
| 906 | struct video_info *dp_video_config; |
| 907 | |
| 908 | pd = devm_kzalloc(dev, sizeof(*pd), GFP_KERNEL); |
| 909 | if (!pd) { |
| 910 | dev_err(dev, "memory allocation for pdata failed\n"); |
| 911 | return ERR_PTR(-ENOMEM); |
| 912 | } |
| 913 | dp_video_config = devm_kzalloc(dev, |
| 914 | sizeof(*dp_video_config), GFP_KERNEL); |
| 915 | |
| 916 | if (!dp_video_config) { |
| 917 | dev_err(dev, "memory allocation for video config failed\n"); |
| 918 | return ERR_PTR(-ENOMEM); |
| 919 | } |
| 920 | pd->video_info = dp_video_config; |
| 921 | |
| 922 | dp_video_config->h_sync_polarity = |
| 923 | of_property_read_bool(dp_node, "hsync-active-high"); |
| 924 | |
| 925 | dp_video_config->v_sync_polarity = |
| 926 | of_property_read_bool(dp_node, "vsync-active-high"); |
| 927 | |
| 928 | dp_video_config->interlaced = |
| 929 | of_property_read_bool(dp_node, "interlaced"); |
| 930 | |
| 931 | if (of_property_read_u32(dp_node, "samsung,color-space", |
| 932 | &dp_video_config->color_space)) { |
| 933 | dev_err(dev, "failed to get color-space\n"); |
| 934 | return ERR_PTR(-EINVAL); |
| 935 | } |
| 936 | |
| 937 | if (of_property_read_u32(dp_node, "samsung,dynamic-range", |
| 938 | &dp_video_config->dynamic_range)) { |
| 939 | dev_err(dev, "failed to get dynamic-range\n"); |
| 940 | return ERR_PTR(-EINVAL); |
| 941 | } |
| 942 | |
| 943 | if (of_property_read_u32(dp_node, "samsung,ycbcr-coeff", |
| 944 | &dp_video_config->ycbcr_coeff)) { |
| 945 | dev_err(dev, "failed to get ycbcr-coeff\n"); |
| 946 | return ERR_PTR(-EINVAL); |
| 947 | } |
| 948 | |
| 949 | if (of_property_read_u32(dp_node, "samsung,color-depth", |
| 950 | &dp_video_config->color_depth)) { |
| 951 | dev_err(dev, "failed to get color-depth\n"); |
| 952 | return ERR_PTR(-EINVAL); |
| 953 | } |
| 954 | |
| 955 | if (of_property_read_u32(dp_node, "samsung,link-rate", |
| 956 | &dp_video_config->link_rate)) { |
| 957 | dev_err(dev, "failed to get link-rate\n"); |
| 958 | return ERR_PTR(-EINVAL); |
| 959 | } |
| 960 | |
| 961 | if (of_property_read_u32(dp_node, "samsung,lane-count", |
| 962 | &dp_video_config->lane_count)) { |
| 963 | dev_err(dev, "failed to get lane-count\n"); |
| 964 | return ERR_PTR(-EINVAL); |
| 965 | } |
| 966 | |
| 967 | return pd; |
| 968 | } |
| 969 | |
| 970 | static int exynos_dp_dt_parse_phydata(struct exynos_dp_device *dp) |
| 971 | { |
| 972 | struct device_node *dp_phy_node; |
| 973 | u32 phy_base; |
| 974 | |
| 975 | dp_phy_node = of_find_node_by_name(dp->dev->of_node, "dptx-phy"); |
| 976 | if (!dp_phy_node) { |
| 977 | dev_err(dp->dev, "could not find dptx-phy node\n"); |
| 978 | return -ENODEV; |
| 979 | } |
| 980 | |
| 981 | if (of_property_read_u32(dp_phy_node, "reg", &phy_base)) { |
| 982 | dev_err(dp->dev, "faild to get reg for dptx-phy\n"); |
| 983 | return -EINVAL; |
| 984 | } |
| 985 | |
| 986 | if (of_property_read_u32(dp_phy_node, "samsung,enable-mask", |
| 987 | &dp->enable_mask)) { |
| 988 | dev_err(dp->dev, "faild to get enable-mask for dptx-phy\n"); |
| 989 | return -EINVAL; |
| 990 | } |
| 991 | |
| 992 | dp->phy_addr = ioremap(phy_base, SZ_4); |
| 993 | if (!dp->phy_addr) { |
| 994 | dev_err(dp->dev, "failed to ioremap dp-phy\n"); |
| 995 | return -ENOMEM; |
| 996 | } |
| 997 | |
| 998 | return 0; |
| 999 | } |
| 1000 | |
| 1001 | static void exynos_dp_phy_init(struct exynos_dp_device *dp) |
| 1002 | { |
| 1003 | u32 reg; |
| 1004 | |
| 1005 | reg = __raw_readl(dp->phy_addr); |
| 1006 | reg |= dp->enable_mask; |
| 1007 | __raw_writel(reg, dp->phy_addr); |
| 1008 | } |
| 1009 | |
| 1010 | static void exynos_dp_phy_exit(struct exynos_dp_device *dp) |
| 1011 | { |
| 1012 | u32 reg; |
| 1013 | |
| 1014 | reg = __raw_readl(dp->phy_addr); |
| 1015 | reg &= ~(dp->enable_mask); |
| 1016 | __raw_writel(reg, dp->phy_addr); |
| 1017 | } |
| 1018 | #else |
| 1019 | static struct exynos_dp_platdata *exynos_dp_dt_parse_pdata(struct device *dev) |
| 1020 | { |
| 1021 | return NULL; |
| 1022 | } |
| 1023 | |
| 1024 | static int exynos_dp_dt_parse_phydata(struct exynos_dp_device *dp) |
| 1025 | { |
| 1026 | return -EINVAL; |
| 1027 | } |
| 1028 | |
| 1029 | static void exynos_dp_phy_init(struct exynos_dp_device *dp) |
| 1030 | { |
| 1031 | return; |
| 1032 | } |
| 1033 | |
| 1034 | static void exynos_dp_phy_exit(struct exynos_dp_device *dp) |
| 1035 | { |
| 1036 | return; |
| 1037 | } |
| 1038 | #endif /* CONFIG_OF */ |
| 1039 | |
Jingoo Han | e9474be | 2012-02-03 18:01:55 +0900 | [diff] [blame] | 1040 | static int __devinit exynos_dp_probe(struct platform_device *pdev) |
| 1041 | { |
| 1042 | struct resource *res; |
| 1043 | struct exynos_dp_device *dp; |
| 1044 | struct exynos_dp_platdata *pdata; |
| 1045 | |
| 1046 | int ret = 0; |
| 1047 | |
Jingoo Han | 4d10ecf8 | 2012-05-25 16:20:45 +0900 | [diff] [blame] | 1048 | dp = devm_kzalloc(&pdev->dev, sizeof(struct exynos_dp_device), |
| 1049 | GFP_KERNEL); |
Jingoo Han | e9474be | 2012-02-03 18:01:55 +0900 | [diff] [blame] | 1050 | if (!dp) { |
| 1051 | dev_err(&pdev->dev, "no memory for device data\n"); |
| 1052 | return -ENOMEM; |
| 1053 | } |
| 1054 | |
| 1055 | dp->dev = &pdev->dev; |
| 1056 | |
Ajay Kumar | c4e235c | 2012-10-13 05:48:00 +0900 | [diff] [blame] | 1057 | if (pdev->dev.of_node) { |
| 1058 | pdata = exynos_dp_dt_parse_pdata(&pdev->dev); |
| 1059 | if (IS_ERR(pdata)) |
| 1060 | return PTR_ERR(pdata); |
| 1061 | |
| 1062 | ret = exynos_dp_dt_parse_phydata(dp); |
| 1063 | if (ret) |
| 1064 | return ret; |
| 1065 | } else { |
| 1066 | pdata = pdev->dev.platform_data; |
| 1067 | if (!pdata) { |
| 1068 | dev_err(&pdev->dev, "no platform data\n"); |
| 1069 | return -EINVAL; |
| 1070 | } |
| 1071 | } |
| 1072 | |
Damien Cassou | d913f36 | 2012-08-01 18:20:39 +0200 | [diff] [blame] | 1073 | dp->clock = devm_clk_get(&pdev->dev, "dp"); |
Jingoo Han | e9474be | 2012-02-03 18:01:55 +0900 | [diff] [blame] | 1074 | if (IS_ERR(dp->clock)) { |
| 1075 | dev_err(&pdev->dev, "failed to get clock\n"); |
Jingoo Han | 4d10ecf8 | 2012-05-25 16:20:45 +0900 | [diff] [blame] | 1076 | return PTR_ERR(dp->clock); |
Jingoo Han | e9474be | 2012-02-03 18:01:55 +0900 | [diff] [blame] | 1077 | } |
| 1078 | |
Jingoo Han | 37414fb | 2012-10-04 15:45:14 +0900 | [diff] [blame] | 1079 | clk_prepare_enable(dp->clock); |
Jingoo Han | e9474be | 2012-02-03 18:01:55 +0900 | [diff] [blame] | 1080 | |
| 1081 | res = platform_get_resource(pdev, IORESOURCE_MEM, 0); |
Jingoo Han | e9474be | 2012-02-03 18:01:55 +0900 | [diff] [blame] | 1082 | |
Jingoo Han | 4d10ecf8 | 2012-05-25 16:20:45 +0900 | [diff] [blame] | 1083 | dp->reg_base = devm_request_and_ioremap(&pdev->dev, res); |
Jingoo Han | e9474be | 2012-02-03 18:01:55 +0900 | [diff] [blame] | 1084 | if (!dp->reg_base) { |
| 1085 | dev_err(&pdev->dev, "failed to ioremap\n"); |
Damien Cassou | d913f36 | 2012-08-01 18:20:39 +0200 | [diff] [blame] | 1086 | return -ENOMEM; |
Jingoo Han | e9474be | 2012-02-03 18:01:55 +0900 | [diff] [blame] | 1087 | } |
| 1088 | |
| 1089 | dp->irq = platform_get_irq(pdev, 0); |
Sean Paul | 1cefc1d | 2012-10-31 23:21:00 +0000 | [diff] [blame] | 1090 | if (dp->irq == -ENXIO) { |
Jingoo Han | e9474be | 2012-02-03 18:01:55 +0900 | [diff] [blame] | 1091 | dev_err(&pdev->dev, "failed to get irq\n"); |
Damien Cassou | d913f36 | 2012-08-01 18:20:39 +0200 | [diff] [blame] | 1092 | return -ENODEV; |
Jingoo Han | e9474be | 2012-02-03 18:01:55 +0900 | [diff] [blame] | 1093 | } |
| 1094 | |
Sean Paul | 784fa9a | 2012-11-09 13:55:08 +0900 | [diff] [blame] | 1095 | INIT_WORK(&dp->hotplug_work, exynos_dp_hotplug); |
| 1096 | |
Jingoo Han | 4d10ecf8 | 2012-05-25 16:20:45 +0900 | [diff] [blame] | 1097 | ret = devm_request_irq(&pdev->dev, dp->irq, exynos_dp_irq_handler, 0, |
| 1098 | "exynos-dp", dp); |
Jingoo Han | e9474be | 2012-02-03 18:01:55 +0900 | [diff] [blame] | 1099 | if (ret) { |
| 1100 | dev_err(&pdev->dev, "failed to request irq\n"); |
Damien Cassou | d913f36 | 2012-08-01 18:20:39 +0200 | [diff] [blame] | 1101 | return ret; |
Jingoo Han | e9474be | 2012-02-03 18:01:55 +0900 | [diff] [blame] | 1102 | } |
| 1103 | |
| 1104 | dp->video_info = pdata->video_info; |
Ajay Kumar | c4e235c | 2012-10-13 05:48:00 +0900 | [diff] [blame] | 1105 | |
| 1106 | if (pdev->dev.of_node) { |
| 1107 | if (dp->phy_addr) |
| 1108 | exynos_dp_phy_init(dp); |
| 1109 | } else { |
| 1110 | if (pdata->phy_init) |
| 1111 | pdata->phy_init(); |
| 1112 | } |
Jingoo Han | e9474be | 2012-02-03 18:01:55 +0900 | [diff] [blame] | 1113 | |
| 1114 | exynos_dp_init_dp(dp); |
| 1115 | |
Jingoo Han | e9474be | 2012-02-03 18:01:55 +0900 | [diff] [blame] | 1116 | platform_set_drvdata(pdev, dp); |
| 1117 | |
| 1118 | return 0; |
Jingoo Han | e9474be | 2012-02-03 18:01:55 +0900 | [diff] [blame] | 1119 | } |
| 1120 | |
| 1121 | static int __devexit exynos_dp_remove(struct platform_device *pdev) |
| 1122 | { |
| 1123 | struct exynos_dp_platdata *pdata = pdev->dev.platform_data; |
| 1124 | struct exynos_dp_device *dp = platform_get_drvdata(pdev); |
| 1125 | |
Sean Paul | c30ffb9 | 2012-11-01 19:13:46 +0900 | [diff] [blame^] | 1126 | disable_irq(dp->irq); |
| 1127 | |
Sean Paul | 784fa9a | 2012-11-09 13:55:08 +0900 | [diff] [blame] | 1128 | if (work_pending(&dp->hotplug_work)) |
| 1129 | flush_work(&dp->hotplug_work); |
| 1130 | |
Ajay Kumar | c4e235c | 2012-10-13 05:48:00 +0900 | [diff] [blame] | 1131 | if (pdev->dev.of_node) { |
| 1132 | if (dp->phy_addr) |
| 1133 | exynos_dp_phy_exit(dp); |
| 1134 | } else { |
| 1135 | if (pdata->phy_exit) |
| 1136 | pdata->phy_exit(); |
| 1137 | } |
Jingoo Han | e9474be | 2012-02-03 18:01:55 +0900 | [diff] [blame] | 1138 | |
Jingoo Han | 37414fb | 2012-10-04 15:45:14 +0900 | [diff] [blame] | 1139 | clk_disable_unprepare(dp->clock); |
Jingoo Han | e9474be | 2012-02-03 18:01:55 +0900 | [diff] [blame] | 1140 | |
Sean Paul | 784fa9a | 2012-11-09 13:55:08 +0900 | [diff] [blame] | 1141 | |
Jingoo Han | e9474be | 2012-02-03 18:01:55 +0900 | [diff] [blame] | 1142 | return 0; |
| 1143 | } |
| 1144 | |
| 1145 | #ifdef CONFIG_PM_SLEEP |
| 1146 | static int exynos_dp_suspend(struct device *dev) |
| 1147 | { |
Ajay Kumar | c4e235c | 2012-10-13 05:48:00 +0900 | [diff] [blame] | 1148 | struct exynos_dp_platdata *pdata = dev->platform_data; |
| 1149 | struct exynos_dp_device *dp = dev_get_drvdata(dev); |
Jingoo Han | e9474be | 2012-02-03 18:01:55 +0900 | [diff] [blame] | 1150 | |
Sean Paul | 784fa9a | 2012-11-09 13:55:08 +0900 | [diff] [blame] | 1151 | if (work_pending(&dp->hotplug_work)) |
| 1152 | flush_work(&dp->hotplug_work); |
| 1153 | |
Ajay Kumar | c4e235c | 2012-10-13 05:48:00 +0900 | [diff] [blame] | 1154 | if (dev->of_node) { |
| 1155 | if (dp->phy_addr) |
| 1156 | exynos_dp_phy_exit(dp); |
| 1157 | } else { |
| 1158 | if (pdata->phy_exit) |
| 1159 | pdata->phy_exit(); |
| 1160 | } |
Jingoo Han | e9474be | 2012-02-03 18:01:55 +0900 | [diff] [blame] | 1161 | |
Jingoo Han | 37414fb | 2012-10-04 15:45:14 +0900 | [diff] [blame] | 1162 | clk_disable_unprepare(dp->clock); |
Jingoo Han | e9474be | 2012-02-03 18:01:55 +0900 | [diff] [blame] | 1163 | |
| 1164 | return 0; |
| 1165 | } |
| 1166 | |
| 1167 | static int exynos_dp_resume(struct device *dev) |
| 1168 | { |
Ajay Kumar | c4e235c | 2012-10-13 05:48:00 +0900 | [diff] [blame] | 1169 | struct exynos_dp_platdata *pdata = dev->platform_data; |
| 1170 | struct exynos_dp_device *dp = dev_get_drvdata(dev); |
Jingoo Han | e9474be | 2012-02-03 18:01:55 +0900 | [diff] [blame] | 1171 | |
Ajay Kumar | c4e235c | 2012-10-13 05:48:00 +0900 | [diff] [blame] | 1172 | if (dev->of_node) { |
| 1173 | if (dp->phy_addr) |
| 1174 | exynos_dp_phy_init(dp); |
| 1175 | } else { |
| 1176 | if (pdata->phy_init) |
| 1177 | pdata->phy_init(); |
| 1178 | } |
Jingoo Han | e9474be | 2012-02-03 18:01:55 +0900 | [diff] [blame] | 1179 | |
Jingoo Han | 37414fb | 2012-10-04 15:45:14 +0900 | [diff] [blame] | 1180 | clk_prepare_enable(dp->clock); |
Jingoo Han | e9474be | 2012-02-03 18:01:55 +0900 | [diff] [blame] | 1181 | |
| 1182 | exynos_dp_init_dp(dp); |
| 1183 | |
Sean Paul | c30ffb9 | 2012-11-01 19:13:46 +0900 | [diff] [blame^] | 1184 | enable_irq(dp->irq); |
Jingoo Han | e9474be | 2012-02-03 18:01:55 +0900 | [diff] [blame] | 1185 | |
| 1186 | return 0; |
| 1187 | } |
| 1188 | #endif |
| 1189 | |
| 1190 | static const struct dev_pm_ops exynos_dp_pm_ops = { |
| 1191 | SET_SYSTEM_SLEEP_PM_OPS(exynos_dp_suspend, exynos_dp_resume) |
| 1192 | }; |
| 1193 | |
Ajay Kumar | c4e235c | 2012-10-13 05:48:00 +0900 | [diff] [blame] | 1194 | static const struct of_device_id exynos_dp_match[] = { |
| 1195 | { .compatible = "samsung,exynos5-dp" }, |
| 1196 | {}, |
| 1197 | }; |
| 1198 | MODULE_DEVICE_TABLE(of, exynos_dp_match); |
| 1199 | |
Jingoo Han | e9474be | 2012-02-03 18:01:55 +0900 | [diff] [blame] | 1200 | static struct platform_driver exynos_dp_driver = { |
| 1201 | .probe = exynos_dp_probe, |
| 1202 | .remove = __devexit_p(exynos_dp_remove), |
| 1203 | .driver = { |
| 1204 | .name = "exynos-dp", |
| 1205 | .owner = THIS_MODULE, |
| 1206 | .pm = &exynos_dp_pm_ops, |
Ajay Kumar | c4e235c | 2012-10-13 05:48:00 +0900 | [diff] [blame] | 1207 | .of_match_table = of_match_ptr(exynos_dp_match), |
Jingoo Han | e9474be | 2012-02-03 18:01:55 +0900 | [diff] [blame] | 1208 | }, |
| 1209 | }; |
| 1210 | |
| 1211 | module_platform_driver(exynos_dp_driver); |
| 1212 | |
| 1213 | MODULE_AUTHOR("Jingoo Han <jg1.han@samsung.com>"); |
| 1214 | MODULE_DESCRIPTION("Samsung SoC DP Driver"); |
| 1215 | MODULE_LICENSE("GPL"); |