drivers/gpu/drm/ast/ast_dp.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 // Copyright (c) 2021, ASPEED Technology Inc.
   3 // Authors: KuoHsiang Chou <[email protected]>
   4
   5 #include <linux/firmware.h>
   6 #include <linux/delay.h>
   7
   8 #include <drm/drm_atomic_state_helper.h>
   9 #include <drm/drm_edid.h>
  10 #include <drm/drm_modeset_helper_vtables.h>
  11 #include <drm/drm_print.h>
  12 #include <drm/drm_probe_helper.h>
  13
  14 #include "ast_drv.h"
  15
  16 static bool ast_astdp_is_connected(struct ast_device *ast)
  17 {
  18         if (!ast_get_index_reg_mask(ast, AST_IO_VGACRI, 0xDF, AST_IO_VGACRDF_HPD))
  19                 return false;
  20         return true;
  21 }
  22
  23 static int ast_astdp_read_edid_block(void *data, u8 *buf, unsigned int block, size_t len)
  24 {
  25         struct ast_device *ast = data;
  26         size_t rdlen = round_up(len, 4);
  27         int ret = 0;
  28         unsigned int i;
  29
  30         if (block > 0)
  31                 return -EIO; /* extension headers not supported */
  32
  33         /*
  34          * Protect access to I/O registers from concurrent modesetting
  35          * by acquiring the I/O-register lock.
  36          */
  37         mutex_lock(&ast->modeset_lock);
  38
  39         /* Start reading EDID data */
  40         ast_set_index_reg_mask(ast, AST_IO_VGACRI, 0xe5, (u8)~AST_IO_VGACRE5_EDID_READ_DONE, 0x00);
  41
  42         for (i = 0; i < rdlen; i += 4) {
  43                 unsigned int offset;
  44                 unsigned int j;
  45                 u8 ediddata[4];
  46                 u8 vgacre4;
  47
  48                 offset = (i + block * EDID_LENGTH) / 4;
  49                 if (offset >= 64) {
  50                         ret = -EIO;
  51                         goto out;
  52                 }
  53                 vgacre4 = offset;
  54
  55                 /*
  56                  * CRE4[7:0]: Read-Pointer for EDID (Unit: 4bytes); valid range: 0~64
  57                  */
  58                 ast_set_index_reg(ast, AST_IO_VGACRI, 0xe4, vgacre4);
  59
  60                 /*
  61                  * CRD7[b0]: valid flag for EDID
  62                  * CRD6[b0]: mirror read pointer for EDID
  63                  */
  64                 for (j = 0; j < 200; ++j) {
  65                         u8 vgacrd7, vgacrd6;
  66
  67                         /*
  68                          * Delay are getting longer with each retry.
  69                          *
  70                          * 1. No delay on first try
  71                          * 2. The Delays are often 2 loops when users request "Display Settings"
  72                          *        of right-click of mouse.
  73                          * 3. The Delays are often longer a lot when system resume from S3/S4.
  74                          */
  75                         if (j)
  76                                 mdelay(j + 1);
  77
  78                         /* Wait for EDID offset to show up in mirror register */
  79                         vgacrd7 = ast_get_index_reg(ast, AST_IO_VGACRI, 0xd7);
  80                         if (vgacrd7 & AST_IO_VGACRD7_EDID_VALID_FLAG) {
  81                                 vgacrd6 = ast_get_index_reg(ast, AST_IO_VGACRI, 0xd6);
  82                                 if (vgacrd6 == offset)
  83                                         break;
  84                         }
  85                 }
  86                 if (j == 200) {
  87                         ret = -EBUSY;
  88                         goto out;
  89                 }
  90
  91                 ediddata[0] = ast_get_index_reg(ast, AST_IO_VGACRI, 0xd8);
  92                 ediddata[1] = ast_get_index_reg(ast, AST_IO_VGACRI, 0xd9);
  93                 ediddata[2] = ast_get_index_reg(ast, AST_IO_VGACRI, 0xda);
  94                 ediddata[3] = ast_get_index_reg(ast, AST_IO_VGACRI, 0xdb);
  95
  96                 if (i == 31) {
  97                         /*
  98                          * For 128-bytes EDID_1.3,
  99                          * 1. Add the value of Bytes-126 to Bytes-127.
 100                          *              The Bytes-127 is Checksum. Sum of all 128bytes should
 101                          *              equal 0 (mod 256).
 102                          * 2. Modify Bytes-126 to be 0.
 103                          *              The Bytes-126 indicates the Number of extensions to
 104                          *              follow. 0 represents noextensions.
 105                          */
 106                         ediddata[3] = ediddata[3] + ediddata[2];
 107                         ediddata[2] = 0;
 108                 }
 109
 110                 memcpy(buf, ediddata, min((len - i), 4));
 111                 buf += 4;
 112         }
 113
 114 out:
 115         /* Signal end of reading */
 116         ast_set_index_reg_mask(ast, AST_IO_VGACRI, 0xe5, (u8)~AST_IO_VGACRE5_EDID_READ_DONE,
 117                                AST_IO_VGACRE5_EDID_READ_DONE);
 118
 119         mutex_unlock(&ast->modeset_lock);
 120
 121         return ret;
 122 }
 123
 124 /*
 125  * Launch Aspeed DP
 126  */
 127 int ast_dp_launch(struct ast_device *ast)
 128 {
 129         struct drm_device *dev = &ast->base;
 130         unsigned int i = 10;
 131
 132         while (i) {
 133                 u8 vgacrd1 = ast_get_index_reg(ast, AST_IO_VGACRI, 0xd1);
 134
 135                 if (vgacrd1 & AST_IO_VGACRD1_MCU_FW_EXECUTING)
 136                         break;
 137                 --i;
 138                 msleep(100);
 139         }
 140         if (!i) {
 141                 drm_err(dev, "Wait DPMCU executing timeout\n");
 142                 return -ENODEV;
 143         }
 144
 145         ast_set_index_reg_mask(ast, AST_IO_VGACRI, 0xe5,
 146                                (u8) ~AST_IO_VGACRE5_EDID_READ_DONE,
 147                                AST_IO_VGACRE5_EDID_READ_DONE);
 148
 149         return 0;
 150 }
 151
 152 static bool ast_dp_get_phy_sleep(struct ast_device *ast)
 153 {
 154         u8 vgacre3 = ast_get_index_reg(ast, AST_IO_VGACRI, 0xe3);
 155
 156         return (vgacre3 & AST_IO_VGACRE3_DP_PHY_SLEEP);
 157 }
 158
 159 static void ast_dp_set_phy_sleep(struct ast_device *ast, bool sleep)
 160 {
 161         u8 vgacre3 = 0x00;
 162
 163         if (sleep)
 164                 vgacre3 |= AST_IO_VGACRE3_DP_PHY_SLEEP;
 165
 166         ast_set_index_reg_mask(ast, AST_IO_VGACRI, 0xe3, (u8)~AST_IO_VGACRE3_DP_PHY_SLEEP,
 167                                vgacre3);
 168         msleep(50);
 169 }
 170
 171 static void ast_dp_link_training(struct ast_device *ast)
 172 {
 173         struct drm_device *dev = &ast->base;
 174         int i;
 175
 176         for (i = 0; i < 10; i++) {
 177                 u8 vgacrdc;
 178
 179                 if (i)
 180                         msleep(100);
 181
 182                 vgacrdc = ast_get_index_reg(ast, AST_IO_VGACRI, 0xdc);
 183                 if (vgacrdc & AST_IO_VGACRDC_LINK_SUCCESS)
 184                         return;
 185         }
 186         drm_err(dev, "Link training failed\n");
 187 }
 188
 189 static bool __ast_dp_wait_enable(struct ast_device *ast, bool enabled)
 190 {
 191         u8 vgacrdf_test = 0x00;
 192         u8 vgacrdf;
 193         unsigned int i;
 194
 195         if (enabled)
 196                 vgacrdf_test |= AST_IO_VGACRDF_DP_VIDEO_ENABLE;
 197
 198         for (i = 0; i < 1000; ++i) {
 199                 if (i)
 200                         mdelay(1);
 201                 vgacrdf = ast_get_index_reg_mask(ast, AST_IO_VGACRI, 0xdf,
 202                                                  AST_IO_VGACRDF_DP_VIDEO_ENABLE);
 203                 if (vgacrdf == vgacrdf_test)
 204                         return true;
 205         }
 206
 207         return false;
 208 }
 209
 210 static void ast_dp_set_enable(struct ast_device *ast, bool enabled)
 211 {
 212         struct drm_device *dev = &ast->base;
 213         u8 vgacre3 = 0x00;
 214
 215         if (enabled)
 216                 vgacre3 |= AST_IO_VGACRE3_DP_VIDEO_ENABLE;
 217
 218         ast_set_index_reg_mask(ast, AST_IO_VGACRI, 0xe3, (u8)~AST_IO_VGACRE3_DP_VIDEO_ENABLE,
 219                                vgacre3);
 220
 221         drm_WARN_ON(dev, !__ast_dp_wait_enable(ast, enabled));
 222 }
 223
 224 static void ast_dp_set_mode(struct drm_crtc *crtc, struct ast_vbios_mode_info *vbios_mode)
 225 {
 226         struct ast_device *ast = to_ast_device(crtc->dev);
 227
 228         u32 ulRefreshRateIndex;
 229         u8 ModeIdx;
 230
 231         ulRefreshRateIndex = vbios_mode->enh_table->refresh_rate_index - 1;
 232
 233         switch (crtc->mode.crtc_hdisplay) {
 234         case 320:
 235                 ModeIdx = ASTDP_320x240_60;
 236                 break;
 237         case 400:
 238                 ModeIdx = ASTDP_400x300_60;
 239                 break;
 240         case 512:
 241                 ModeIdx = ASTDP_512x384_60;
 242                 break;
 243         case 640:
 244                 ModeIdx = (ASTDP_640x480_60 + (u8) ulRefreshRateIndex);
 245                 break;
 246         case 800:
 247                 ModeIdx = (ASTDP_800x600_56 + (u8) ulRefreshRateIndex);
 248                 break;
 249         case 1024:
 250                 ModeIdx = (ASTDP_1024x768_60 + (u8) ulRefreshRateIndex);
 251                 break;
 252         case 1152:
 253                 ModeIdx = ASTDP_1152x864_75;
 254                 break;
 255         case 1280:
 256                 if (crtc->mode.crtc_vdisplay == 800)
 257                         ModeIdx = (ASTDP_1280x800_60_RB - (u8) ulRefreshRateIndex);
 258                 else            // 1024
 259                         ModeIdx = (ASTDP_1280x1024_60 + (u8) ulRefreshRateIndex);
 260                 break;
 261         case 1360:
 262         case 1366:
 263                 ModeIdx = ASTDP_1366x768_60;
 264                 break;
 265         case 1440:
 266                 ModeIdx = (ASTDP_1440x900_60_RB - (u8) ulRefreshRateIndex);
 267                 break;
 268         case 1600:
 269                 if (crtc->mode.crtc_vdisplay == 900)
 270                         ModeIdx = (ASTDP_1600x900_60_RB - (u8) ulRefreshRateIndex);
 271                 else            //1200
 272                         ModeIdx = ASTDP_1600x1200_60;
 273                 break;
 274         case 1680:
 275                 ModeIdx = (ASTDP_1680x1050_60_RB - (u8) ulRefreshRateIndex);
 276                 break;
 277         case 1920:
 278                 if (crtc->mode.crtc_vdisplay == 1080)
 279                         ModeIdx = ASTDP_1920x1080_60;
 280                 else            //1200
 281                         ModeIdx = ASTDP_1920x1200_60;
 282                 break;
 283         default:
 284                 return;
 285         }
 286
 287         /*
 288          * CRE0[7:0]: MISC0 ((0x00: 18-bpp) or (0x20: 24-bpp)
 289          * CRE1[7:0]: MISC1 (default: 0x00)
 290          * CRE2[7:0]: video format index (0x00 ~ 0x20 or 0x40 ~ 0x50)
 291          */
 292         ast_set_index_reg_mask(ast, AST_IO_VGACRI, 0xE0, ASTDP_AND_CLEAR_MASK,
 293                                ASTDP_MISC0_24bpp);
 294         ast_set_index_reg_mask(ast, AST_IO_VGACRI, 0xE1, ASTDP_AND_CLEAR_MASK, ASTDP_MISC1);
 295         ast_set_index_reg_mask(ast, AST_IO_VGACRI, 0xE2, ASTDP_AND_CLEAR_MASK, ModeIdx);
 296 }
 297
 298 static void ast_wait_for_vretrace(struct ast_device *ast)
 299 {
 300         unsigned long timeout = jiffies + HZ;
 301         u8 vgair1;
 302
 303         do {
 304                 vgair1 = ast_io_read8(ast, AST_IO_VGAIR1_R);
 305         } while (!(vgair1 & AST_IO_VGAIR1_VREFRESH) && time_before(jiffies, timeout));
 306 }
 307
 308 /*
 309  * Encoder
 310  */
 311
 312 static const struct drm_encoder_funcs ast_astdp_encoder_funcs = {
 313         .destroy = drm_encoder_cleanup,
 314 };
 315
 316 static void ast_astdp_encoder_helper_atomic_mode_set(struct drm_encoder *encoder,
 317                                                      struct drm_crtc_state *crtc_state,
 318                                                      struct drm_connector_state *conn_state)
 319 {
 320         struct drm_crtc *crtc = crtc_state->crtc;
 321         struct ast_crtc_state *ast_crtc_state = to_ast_crtc_state(crtc_state);
 322         struct ast_vbios_mode_info *vbios_mode_info = &ast_crtc_state->vbios_mode_info;
 323
 324         ast_dp_set_mode(crtc, vbios_mode_info);
 325 }
 326
 327 static void ast_astdp_encoder_helper_atomic_enable(struct drm_encoder *encoder,
 328                                                    struct drm_atomic_state *state)
 329 {
 330         struct ast_device *ast = to_ast_device(encoder->dev);
 331         struct ast_connector *ast_connector = &ast->output.astdp.connector;
 332
 333         if (ast_connector->physical_status == connector_status_connected) {
 334                 ast_dp_set_phy_sleep(ast, false);
 335                 ast_dp_link_training(ast);
 336
 337                 ast_wait_for_vretrace(ast);
 338                 ast_dp_set_enable(ast, true);
 339         }
 340 }
 341
 342 static void ast_astdp_encoder_helper_atomic_disable(struct drm_encoder *encoder,
 343                                                     struct drm_atomic_state *state)
 344 {
 345         struct ast_device *ast = to_ast_device(encoder->dev);
 346
 347         ast_dp_set_enable(ast, false);
 348         ast_dp_set_phy_sleep(ast, true);
 349 }
 350
 351 static const struct drm_encoder_helper_funcs ast_astdp_encoder_helper_funcs = {
 352         .atomic_mode_set = ast_astdp_encoder_helper_atomic_mode_set,
 353         .atomic_enable = ast_astdp_encoder_helper_atomic_enable,
 354         .atomic_disable = ast_astdp_encoder_helper_atomic_disable,
 355 };
 356
 357 /*
 358  * Connector
 359  */
 360
 361 static int ast_astdp_connector_helper_get_modes(struct drm_connector *connector)
 362 {
 363         struct ast_connector *ast_connector = to_ast_connector(connector);
 364         int count;
 365
 366         if (ast_connector->physical_status == connector_status_connected) {
 367                 struct ast_device *ast = to_ast_device(connector->dev);
 368                 const struct drm_edid *drm_edid;
 369
 370                 drm_edid = drm_edid_read_custom(connector, ast_astdp_read_edid_block, ast);
 371                 drm_edid_connector_update(connector, drm_edid);
 372                 count = drm_edid_connector_add_modes(connector);
 373                 drm_edid_free(drm_edid);
 374         } else {
 375                 drm_edid_connector_update(connector, NULL);
 376
 377                 /*
 378                  * There's no EDID data without a connected monitor. Set BMC-
 379                  * compatible modes in this case. The XGA default resolution
 380                  * should work well for all BMCs.
 381                  */
 382                 count = drm_add_modes_noedid(connector, 4096, 4096);
 383                 if (count)
 384                         drm_set_preferred_mode(connector, 1024, 768);
 385         }
 386
 387         return count;
 388 }
 389
 390 static int ast_astdp_connector_helper_detect_ctx(struct drm_connector *connector,
 391                                                  struct drm_modeset_acquire_ctx *ctx,
 392                                                  bool force)
 393 {
 394         struct ast_connector *ast_connector = to_ast_connector(connector);
 395         struct ast_device *ast = to_ast_device(connector->dev);
 396         enum drm_connector_status status = connector_status_disconnected;
 397         bool phy_sleep;
 398
 399         mutex_lock(&ast->modeset_lock);
 400
 401         phy_sleep = ast_dp_get_phy_sleep(ast);
 402         if (phy_sleep)
 403                 ast_dp_set_phy_sleep(ast, false);
 404
 405         if (ast_astdp_is_connected(ast))
 406                 status = connector_status_connected;
 407
 408         if (phy_sleep && status == connector_status_disconnected)
 409                 ast_dp_set_phy_sleep(ast, true);
 410
 411         mutex_unlock(&ast->modeset_lock);
 412
 413         if (status != ast_connector->physical_status)
 414                 ++connector->epoch_counter;
 415         ast_connector->physical_status = status;
 416
 417         return connector_status_connected;
 418 }
 419
 420 static const struct drm_connector_helper_funcs ast_astdp_connector_helper_funcs = {
 421         .get_modes = ast_astdp_connector_helper_get_modes,
 422         .detect_ctx = ast_astdp_connector_helper_detect_ctx,
 423 };
 424
 425 /*
 426  * Output
 427  */
 428
 429 static const struct drm_connector_funcs ast_astdp_connector_funcs = {
 430         .reset = drm_atomic_helper_connector_reset,
 431         .fill_modes = drm_helper_probe_single_connector_modes,
 432         .destroy = drm_connector_cleanup,
 433         .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
 434         .atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
 435 };
 436
 437 int ast_astdp_output_init(struct ast_device *ast)
 438 {
 439         struct drm_device *dev = &ast->base;
 440         struct drm_crtc *crtc = &ast->crtc;
 441         struct drm_encoder *encoder;
 442         struct ast_connector *ast_connector;
 443         struct drm_connector *connector;
 444         int ret;
 445
 446         /* encoder */
 447
 448         encoder = &ast->output.astdp.encoder;
 449         ret = drm_encoder_init(dev, encoder, &ast_astdp_encoder_funcs,
 450                                DRM_MODE_ENCODER_TMDS, NULL);
 451         if (ret)
 452                 return ret;
 453         drm_encoder_helper_add(encoder, &ast_astdp_encoder_helper_funcs);
 454
 455         encoder->possible_crtcs = drm_crtc_mask(crtc);
 456
 457         /* connector */
 458
 459         ast_connector = &ast->output.astdp.connector;
 460         connector = &ast_connector->base;
 461         ret = drm_connector_init(dev, connector, &ast_astdp_connector_funcs,
 462                                  DRM_MODE_CONNECTOR_DisplayPort);
 463         if (ret)
 464                 return ret;
 465         drm_connector_helper_add(connector, &ast_astdp_connector_helper_funcs);
 466
 467         connector->interlace_allowed = 0;
 468         connector->doublescan_allowed = 0;
 469         connector->polled = DRM_CONNECTOR_POLL_CONNECT | DRM_CONNECTOR_POLL_DISCONNECT;
 470
 471         ast_connector->physical_status = connector->status;
 472
 473         ret = drm_connector_attach_encoder(connector, encoder);
 474         if (ret)
 475                 return ret;
 476
 477         return 0;
 478 }