kernel/drivers/gpu/drm/sti/sti_hdmi.c

   1 /*
   2  * Copyright (C) STMicroelectronics SA 2014
   3  * Author: Vincent Abriou <vincent.abriou@st.com> for STMicroelectronics.
   4  * License terms:  GNU General Public License (GPL), version 2
   5  */
   6
   7 #include <linux/clk.h>
   8 #include <linux/component.h>
   9 #include <linux/hdmi.h>
  10 #include <linux/module.h>
  11 #include <linux/of_gpio.h>
  12 #include <linux/platform_device.h>
  13 #include <linux/reset.h>
  14
  15 #include <drm/drmP.h>
  16 #include <drm/drm_atomic_helper.h>
  17 #include <drm/drm_crtc_helper.h>
  18 #include <drm/drm_edid.h>
  19
  20 #include "sti_hdmi.h"
  21 #include "sti_hdmi_tx3g4c28phy.h"
  22 #include "sti_hdmi_tx3g0c55phy.h"
  23 #include "sti_vtg.h"
  24
  25 #define HDMI_CFG                        0x0000
  26 #define HDMI_INT_EN                     0x0004
  27 #define HDMI_INT_STA                    0x0008
  28 #define HDMI_INT_CLR                    0x000C
  29 #define HDMI_STA                        0x0010
  30 #define HDMI_ACTIVE_VID_XMIN            0x0100
  31 #define HDMI_ACTIVE_VID_XMAX            0x0104
  32 #define HDMI_ACTIVE_VID_YMIN            0x0108
  33 #define HDMI_ACTIVE_VID_YMAX            0x010C
  34 #define HDMI_DFLT_CHL0_DAT              0x0110
  35 #define HDMI_DFLT_CHL1_DAT              0x0114
  36 #define HDMI_DFLT_CHL2_DAT              0x0118
  37 #define HDMI_SW_DI_1_HEAD_WORD          0x0210
  38 #define HDMI_SW_DI_1_PKT_WORD0          0x0214
  39 #define HDMI_SW_DI_1_PKT_WORD1          0x0218
  40 #define HDMI_SW_DI_1_PKT_WORD2          0x021C
  41 #define HDMI_SW_DI_1_PKT_WORD3          0x0220
  42 #define HDMI_SW_DI_1_PKT_WORD4          0x0224
  43 #define HDMI_SW_DI_1_PKT_WORD5          0x0228
  44 #define HDMI_SW_DI_1_PKT_WORD6          0x022C
  45 #define HDMI_SW_DI_CFG                  0x0230
  46 #define HDMI_SW_DI_2_HEAD_WORD          0x0600
  47 #define HDMI_SW_DI_2_PKT_WORD0          0x0604
  48 #define HDMI_SW_DI_2_PKT_WORD1          0x0608
  49 #define HDMI_SW_DI_2_PKT_WORD2          0x060C
  50 #define HDMI_SW_DI_2_PKT_WORD3          0x0610
  51 #define HDMI_SW_DI_2_PKT_WORD4          0x0614
  52 #define HDMI_SW_DI_2_PKT_WORD5          0x0618
  53 #define HDMI_SW_DI_2_PKT_WORD6          0x061C
  54
  55 #define HDMI_IFRAME_SLOT_AVI            1
  56 #define HDMI_IFRAME_SLOT_AUDIO          2
  57
  58 #define  XCAT(prefix, x, suffix)        prefix ## x ## suffix
  59 #define  HDMI_SW_DI_N_HEAD_WORD(x)      XCAT(HDMI_SW_DI_, x, _HEAD_WORD)
  60 #define  HDMI_SW_DI_N_PKT_WORD0(x)      XCAT(HDMI_SW_DI_, x, _PKT_WORD0)
  61 #define  HDMI_SW_DI_N_PKT_WORD1(x)      XCAT(HDMI_SW_DI_, x, _PKT_WORD1)
  62 #define  HDMI_SW_DI_N_PKT_WORD2(x)      XCAT(HDMI_SW_DI_, x, _PKT_WORD2)
  63 #define  HDMI_SW_DI_N_PKT_WORD3(x)      XCAT(HDMI_SW_DI_, x, _PKT_WORD3)
  64 #define  HDMI_SW_DI_N_PKT_WORD4(x)      XCAT(HDMI_SW_DI_, x, _PKT_WORD4)
  65 #define  HDMI_SW_DI_N_PKT_WORD5(x)      XCAT(HDMI_SW_DI_, x, _PKT_WORD5)
  66 #define  HDMI_SW_DI_N_PKT_WORD6(x)      XCAT(HDMI_SW_DI_, x, _PKT_WORD6)
  67
  68 #define HDMI_IFRAME_DISABLED            0x0
  69 #define HDMI_IFRAME_SINGLE_SHOT         0x1
  70 #define HDMI_IFRAME_FIELD               0x2
  71 #define HDMI_IFRAME_FRAME               0x3
  72 #define HDMI_IFRAME_MASK                0x3
  73 #define HDMI_IFRAME_CFG_DI_N(x, n)       ((x) << ((n-1)*4)) /* n from 1 to 6 */
  74
  75 #define HDMI_CFG_DEVICE_EN              BIT(0)
  76 #define HDMI_CFG_HDMI_NOT_DVI           BIT(1)
  77 #define HDMI_CFG_HDCP_EN                BIT(2)
  78 #define HDMI_CFG_ESS_NOT_OESS           BIT(3)
  79 #define HDMI_CFG_H_SYNC_POL_NEG         BIT(4)
  80 #define HDMI_CFG_SINK_TERM_DET_EN       BIT(5)
  81 #define HDMI_CFG_V_SYNC_POL_NEG         BIT(6)
  82 #define HDMI_CFG_422_EN                 BIT(8)
  83 #define HDMI_CFG_FIFO_OVERRUN_CLR       BIT(12)
  84 #define HDMI_CFG_FIFO_UNDERRUN_CLR      BIT(13)
  85 #define HDMI_CFG_SW_RST_EN              BIT(31)
  86
  87 #define HDMI_INT_GLOBAL                 BIT(0)
  88 #define HDMI_INT_SW_RST                 BIT(1)
  89 #define HDMI_INT_PIX_CAP                BIT(3)
  90 #define HDMI_INT_HOT_PLUG               BIT(4)
  91 #define HDMI_INT_DLL_LCK                BIT(5)
  92 #define HDMI_INT_NEW_FRAME              BIT(6)
  93 #define HDMI_INT_GENCTRL_PKT            BIT(7)
  94 #define HDMI_INT_SINK_TERM_PRESENT      BIT(11)
  95
  96 #define HDMI_DEFAULT_INT (HDMI_INT_SINK_TERM_PRESENT \
  97                         | HDMI_INT_DLL_LCK \
  98                         | HDMI_INT_HOT_PLUG \
  99                         | HDMI_INT_GLOBAL)
 100
 101 #define HDMI_WORKING_INT (HDMI_INT_SINK_TERM_PRESENT \
 102                         | HDMI_INT_GENCTRL_PKT \
 103                         | HDMI_INT_NEW_FRAME \
 104                         | HDMI_INT_DLL_LCK \
 105                         | HDMI_INT_HOT_PLUG \
 106                         | HDMI_INT_PIX_CAP \
 107                         | HDMI_INT_SW_RST \
 108                         | HDMI_INT_GLOBAL)
 109
 110 #define HDMI_STA_SW_RST                 BIT(1)
 111
 112 #define HDMI_INFOFRAME_HEADER_TYPE(x)    (((x) & 0xff) <<  0)
 113 #define HDMI_INFOFRAME_HEADER_VERSION(x) (((x) & 0xff) <<  8)
 114 #define HDMI_INFOFRAME_HEADER_LEN(x)     (((x) & 0x0f) << 16)
 115
 116 struct sti_hdmi_connector {
 117         struct drm_connector drm_connector;
 118         struct drm_encoder *encoder;
 119         struct sti_hdmi *hdmi;
 120 };
 121
 122 #define to_sti_hdmi_connector(x) \
 123         container_of(x, struct sti_hdmi_connector, drm_connector)
 124
 125 u32 hdmi_read(struct sti_hdmi *hdmi, int offset)
 126 {
 127         return readl(hdmi->regs + offset);
 128 }
 129
 130 void hdmi_write(struct sti_hdmi *hdmi, u32 val, int offset)
 131 {
 132         writel(val, hdmi->regs + offset);
 133 }
 134
 135 /**
 136  * HDMI interrupt handler threaded
 137  *
 138  * @irq: irq number
 139  * @arg: connector structure
 140  */
 141 static irqreturn_t hdmi_irq_thread(int irq, void *arg)
 142 {
 143         struct sti_hdmi *hdmi = arg;
 144
 145         /* Hot plug/unplug IRQ */
 146         if (hdmi->irq_status & HDMI_INT_HOT_PLUG) {
 147                 hdmi->hpd = readl(hdmi->regs + HDMI_STA) & HDMI_STA_HOT_PLUG;
 148                 if (hdmi->drm_dev)
 149                         drm_helper_hpd_irq_event(hdmi->drm_dev);
 150         }
 151
 152         /* Sw reset and PLL lock are exclusive so we can use the same
 153          * event to signal them
 154          */
 155         if (hdmi->irq_status & (HDMI_INT_SW_RST | HDMI_INT_DLL_LCK)) {
 156                 hdmi->event_received = true;
 157                 wake_up_interruptible(&hdmi->wait_event);
 158         }
 159
 160         return IRQ_HANDLED;
 161 }
 162
 163 /**
 164  * HDMI interrupt handler
 165  *
 166  * @irq: irq number
 167  * @arg: connector structure
 168  */
 169 static irqreturn_t hdmi_irq(int irq, void *arg)
 170 {
 171         struct sti_hdmi *hdmi = arg;
 172
 173         /* read interrupt status */
 174         hdmi->irq_status = hdmi_read(hdmi, HDMI_INT_STA);
 175
 176         /* clear interrupt status */
 177         hdmi_write(hdmi, hdmi->irq_status, HDMI_INT_CLR);
 178
 179         /* force sync bus write */
 180         hdmi_read(hdmi, HDMI_INT_STA);
 181
 182         return IRQ_WAKE_THREAD;
 183 }
 184
 185 /**
 186  * Set hdmi active area depending on the drm display mode selected
 187  *
 188  * @hdmi: pointer on the hdmi internal structure
 189  */
 190 static void hdmi_active_area(struct sti_hdmi *hdmi)
 191 {
 192         u32 xmin, xmax;
 193         u32 ymin, ymax;
 194
 195         xmin = sti_vtg_get_pixel_number(hdmi->mode, 0);
 196         xmax = sti_vtg_get_pixel_number(hdmi->mode, hdmi->mode.hdisplay - 1);
 197         ymin = sti_vtg_get_line_number(hdmi->mode, 0);
 198         ymax = sti_vtg_get_line_number(hdmi->mode, hdmi->mode.vdisplay - 1);
 199
 200         hdmi_write(hdmi, xmin, HDMI_ACTIVE_VID_XMIN);
 201         hdmi_write(hdmi, xmax, HDMI_ACTIVE_VID_XMAX);
 202         hdmi_write(hdmi, ymin, HDMI_ACTIVE_VID_YMIN);
 203         hdmi_write(hdmi, ymax, HDMI_ACTIVE_VID_YMAX);
 204 }
 205
 206 /**
 207  * Overall hdmi configuration
 208  *
 209  * @hdmi: pointer on the hdmi internal structure
 210  */
 211 static void hdmi_config(struct sti_hdmi *hdmi)
 212 {
 213         u32 conf;
 214
 215         DRM_DEBUG_DRIVER("\n");
 216
 217         /* Clear overrun and underrun fifo */
 218         conf = HDMI_CFG_FIFO_OVERRUN_CLR | HDMI_CFG_FIFO_UNDERRUN_CLR;
 219
 220         /* Enable HDMI mode not DVI */
 221         conf |= HDMI_CFG_HDMI_NOT_DVI | HDMI_CFG_ESS_NOT_OESS;
 222
 223         /* Enable sink term detection */
 224         conf |= HDMI_CFG_SINK_TERM_DET_EN;
 225
 226         /* Set Hsync polarity */
 227         if (hdmi->mode.flags & DRM_MODE_FLAG_NHSYNC) {
 228                 DRM_DEBUG_DRIVER("H Sync Negative\n");
 229                 conf |= HDMI_CFG_H_SYNC_POL_NEG;
 230         }
 231
 232         /* Set Vsync polarity */
 233         if (hdmi->mode.flags & DRM_MODE_FLAG_NVSYNC) {
 234                 DRM_DEBUG_DRIVER("V Sync Negative\n");
 235                 conf |= HDMI_CFG_V_SYNC_POL_NEG;
 236         }
 237
 238         /* Enable HDMI */
 239         conf |= HDMI_CFG_DEVICE_EN;
 240
 241         hdmi_write(hdmi, conf, HDMI_CFG);
 242 }
 243
 244 /**
 245  * Helper to concatenate infoframe in 32 bits word
 246  *
 247  * @ptr: pointer on the hdmi internal structure
 248  * @data: infoframe to write
 249  * @size: size to write
 250  */
 251 static inline unsigned int hdmi_infoframe_subpack(const u8 *ptr, size_t size)
 252 {
 253         unsigned long value = 0;
 254         size_t i;
 255
 256         for (i = size; i > 0; i--)
 257                 value = (value << 8) | ptr[i - 1];
 258
 259         return value;
 260 }
 261
 262 /**
 263  * Helper to write info frame
 264  *
 265  * @hdmi: pointer on the hdmi internal structure
 266  * @data: infoframe to write
 267  * @size: size to write
 268  */
 269 static void hdmi_infoframe_write_infopack(struct sti_hdmi *hdmi, const u8 *data)
 270 {
 271         const u8 *ptr = data;
 272         u32 val, slot, mode, i;
 273         u32 head_offset, pack_offset;
 274         size_t size;
 275
 276         switch (*ptr) {
 277         case HDMI_INFOFRAME_TYPE_AVI:
 278                 slot = HDMI_IFRAME_SLOT_AVI;
 279                 mode = HDMI_IFRAME_FIELD;
 280                 head_offset = HDMI_SW_DI_N_HEAD_WORD(HDMI_IFRAME_SLOT_AVI);
 281                 pack_offset = HDMI_SW_DI_N_PKT_WORD0(HDMI_IFRAME_SLOT_AVI);
 282                 size = HDMI_AVI_INFOFRAME_SIZE;
 283                 break;
 284
 285         case HDMI_INFOFRAME_TYPE_AUDIO:
 286                 slot = HDMI_IFRAME_SLOT_AUDIO;
 287                 mode = HDMI_IFRAME_FRAME;
 288                 head_offset = HDMI_SW_DI_N_HEAD_WORD(HDMI_IFRAME_SLOT_AUDIO);
 289                 pack_offset = HDMI_SW_DI_N_PKT_WORD0(HDMI_IFRAME_SLOT_AUDIO);
 290                 size = HDMI_AUDIO_INFOFRAME_SIZE;
 291                 break;
 292
 293         default:
 294                 DRM_ERROR("unsupported infoframe type: %#x\n", *ptr);
 295                 return;
 296         }
 297
 298         /* Disable transmission slot for updated infoframe */
 299         val = hdmi_read(hdmi, HDMI_SW_DI_CFG);
 300         val &= ~HDMI_IFRAME_CFG_DI_N(HDMI_IFRAME_MASK, slot);
 301         hdmi_write(hdmi, val, HDMI_SW_DI_CFG);
 302
 303         val = HDMI_INFOFRAME_HEADER_TYPE(*ptr++);
 304         val |= HDMI_INFOFRAME_HEADER_VERSION(*ptr++);
 305         val |= HDMI_INFOFRAME_HEADER_LEN(*ptr++);
 306         writel(val, hdmi->regs + head_offset);
 307
 308         /*
 309          * Each subpack contains 4 bytes
 310          * The First Bytes of the first subpacket must contain the checksum
 311          * Packet size in increase by one.
 312          */
 313         for (i = 0; i < size; i += sizeof(u32)) {
 314                 size_t num;
 315
 316                 num = min_t(size_t, size - i, sizeof(u32));
 317                 val = hdmi_infoframe_subpack(ptr, num);
 318                 ptr += sizeof(u32);
 319                 writel(val, hdmi->regs + pack_offset + i);
 320         }
 321
 322         /* Enable transmission slot for updated infoframe */
 323         val = hdmi_read(hdmi, HDMI_SW_DI_CFG);
 324         val |= HDMI_IFRAME_CFG_DI_N(HDMI_IFRAME_FIELD, slot);
 325         hdmi_write(hdmi, val, HDMI_SW_DI_CFG);
 326 }
 327
 328 /**
 329  * Prepare and configure the AVI infoframe
 330  *
 331  * AVI infoframe are transmitted at least once per two video field and
 332  * contains information about HDMI transmission mode such as color space,
 333  * colorimetry, ...
 334  *
 335  * @hdmi: pointer on the hdmi internal structure
 336  *
 337  * Return negative value if error occurs
 338  */
 339 static int hdmi_avi_infoframe_config(struct sti_hdmi *hdmi)
 340 {
 341         struct drm_display_mode *mode = &hdmi->mode;
 342         struct hdmi_avi_infoframe infoframe;
 343         u8 buffer[HDMI_INFOFRAME_SIZE(AVI)];
 344         int ret;
 345
 346         DRM_DEBUG_DRIVER("\n");
 347
 348         ret = drm_hdmi_avi_infoframe_from_display_mode(&infoframe, mode);
 349         if (ret < 0) {
 350                 DRM_ERROR("failed to setup AVI infoframe: %d\n", ret);
 351                 return ret;
 352         }
 353
 354         /* fixed infoframe configuration not linked to the mode */
 355         infoframe.colorspace = HDMI_COLORSPACE_RGB;
 356         infoframe.quantization_range = HDMI_QUANTIZATION_RANGE_DEFAULT;
 357         infoframe.colorimetry = HDMI_COLORIMETRY_NONE;
 358
 359         ret = hdmi_avi_infoframe_pack(&infoframe, buffer, sizeof(buffer));
 360         if (ret < 0) {
 361                 DRM_ERROR("failed to pack AVI infoframe: %d\n", ret);
 362                 return ret;
 363         }
 364
 365         hdmi_infoframe_write_infopack(hdmi, buffer);
 366
 367         return 0;
 368 }
 369
 370 /**
 371  * Prepare and configure the AUDIO infoframe
 372  *
 373  * AUDIO infoframe are transmitted once per frame and
 374  * contains information about HDMI transmission mode such as audio codec,
 375  * sample size, ...
 376  *
 377  * @hdmi: pointer on the hdmi internal structure
 378  *
 379  * Return negative value if error occurs
 380  */
 381 static int hdmi_audio_infoframe_config(struct sti_hdmi *hdmi)
 382 {
 383         struct hdmi_audio_infoframe infofame;
 384         u8 buffer[HDMI_INFOFRAME_SIZE(AUDIO)];
 385         int ret;
 386
 387         ret = hdmi_audio_infoframe_init(&infofame);
 388         if (ret < 0) {
 389                 DRM_ERROR("failed to setup audio infoframe: %d\n", ret);
 390                 return ret;
 391         }
 392
 393         infofame.channels = 2;
 394
 395         ret = hdmi_audio_infoframe_pack(&infofame, buffer, sizeof(buffer));
 396         if (ret < 0) {
 397                 DRM_ERROR("failed to pack audio infoframe: %d\n", ret);
 398                 return ret;
 399         }
 400
 401         hdmi_infoframe_write_infopack(hdmi, buffer);
 402
 403         return 0;
 404 }
 405
 406 /**
 407  * Software reset of the hdmi subsystem
 408  *
 409  * @hdmi: pointer on the hdmi internal structure
 410  *
 411  */
 412 #define HDMI_TIMEOUT_SWRESET  100   /*milliseconds */
 413 static void hdmi_swreset(struct sti_hdmi *hdmi)
 414 {
 415         u32 val;
 416
 417         DRM_DEBUG_DRIVER("\n");
 418
 419         /* Enable hdmi_audio clock only during hdmi reset */
 420         if (clk_prepare_enable(hdmi->clk_audio))
 421                 DRM_INFO("Failed to prepare/enable hdmi_audio clk\n");
 422
 423         /* Sw reset */
 424         hdmi->event_received = false;
 425
 426         val = hdmi_read(hdmi, HDMI_CFG);
 427         val |= HDMI_CFG_SW_RST_EN;
 428         hdmi_write(hdmi, val, HDMI_CFG);
 429
 430         /* Wait reset completed */
 431         wait_event_interruptible_timeout(hdmi->wait_event,
 432                                          hdmi->event_received == true,
 433                                          msecs_to_jiffies
 434                                          (HDMI_TIMEOUT_SWRESET));
 435
 436         /*
 437          * HDMI_STA_SW_RST bit is set to '1' when SW_RST bit in HDMI_CFG is
 438          * set to '1' and clk_audio is running.
 439          */
 440         if ((hdmi_read(hdmi, HDMI_STA) & HDMI_STA_SW_RST) == 0)
 441                 DRM_DEBUG_DRIVER("Warning: HDMI sw reset timeout occurs\n");
 442
 443         val = hdmi_read(hdmi, HDMI_CFG);
 444         val &= ~HDMI_CFG_SW_RST_EN;
 445         hdmi_write(hdmi, val, HDMI_CFG);
 446
 447         /* Disable hdmi_audio clock. Not used anymore for drm purpose */
 448         clk_disable_unprepare(hdmi->clk_audio);
 449 }
 450
 451 static void sti_hdmi_disable(struct drm_bridge *bridge)
 452 {
 453         struct sti_hdmi *hdmi = bridge->driver_private;
 454
 455         u32 val = hdmi_read(hdmi, HDMI_CFG);
 456
 457         if (!hdmi->enabled)
 458                 return;
 459
 460         DRM_DEBUG_DRIVER("\n");
 461
 462         /* Disable HDMI */
 463         val &= ~HDMI_CFG_DEVICE_EN;
 464         hdmi_write(hdmi, val, HDMI_CFG);
 465
 466         hdmi_write(hdmi, 0xffffffff, HDMI_INT_CLR);
 467
 468         /* Stop the phy */
 469         hdmi->phy_ops->stop(hdmi);
 470
 471         /* Set the default channel data to be a dark red */
 472         hdmi_write(hdmi, 0x0000, HDMI_DFLT_CHL0_DAT);
 473         hdmi_write(hdmi, 0x0000, HDMI_DFLT_CHL1_DAT);
 474         hdmi_write(hdmi, 0x0060, HDMI_DFLT_CHL2_DAT);
 475
 476         /* Disable/unprepare hdmi clock */
 477         clk_disable_unprepare(hdmi->clk_phy);
 478         clk_disable_unprepare(hdmi->clk_tmds);
 479         clk_disable_unprepare(hdmi->clk_pix);
 480
 481         hdmi->enabled = false;
 482 }
 483
 484 static void sti_hdmi_pre_enable(struct drm_bridge *bridge)
 485 {
 486         struct sti_hdmi *hdmi = bridge->driver_private;
 487
 488         DRM_DEBUG_DRIVER("\n");
 489
 490         if (hdmi->enabled)
 491                 return;
 492
 493         /* Prepare/enable clocks */
 494         if (clk_prepare_enable(hdmi->clk_pix))
 495                 DRM_ERROR("Failed to prepare/enable hdmi_pix clk\n");
 496         if (clk_prepare_enable(hdmi->clk_tmds))
 497                 DRM_ERROR("Failed to prepare/enable hdmi_tmds clk\n");
 498         if (clk_prepare_enable(hdmi->clk_phy))
 499                 DRM_ERROR("Failed to prepare/enable hdmi_rejec_pll clk\n");
 500
 501         hdmi->enabled = true;
 502
 503         /* Program hdmi serializer and start phy */
 504         if (!hdmi->phy_ops->start(hdmi)) {
 505                 DRM_ERROR("Unable to start hdmi phy\n");
 506                 return;
 507         }
 508
 509         /* Program hdmi active area */
 510         hdmi_active_area(hdmi);
 511
 512         /* Enable working interrupts */
 513         hdmi_write(hdmi, HDMI_WORKING_INT, HDMI_INT_EN);
 514
 515         /* Program hdmi config */
 516         hdmi_config(hdmi);
 517
 518         /* Program AVI infoframe */
 519         if (hdmi_avi_infoframe_config(hdmi))
 520                 DRM_ERROR("Unable to configure AVI infoframe\n");
 521
 522         /* Program AUDIO infoframe */
 523         if (hdmi_audio_infoframe_config(hdmi))
 524                 DRM_ERROR("Unable to configure AUDIO infoframe\n");
 525
 526         /* Sw reset */
 527         hdmi_swreset(hdmi);
 528 }
 529
 530 static void sti_hdmi_set_mode(struct drm_bridge *bridge,
 531                 struct drm_display_mode *mode,
 532                 struct drm_display_mode *adjusted_mode)
 533 {
 534         struct sti_hdmi *hdmi = bridge->driver_private;
 535         int ret;
 536
 537         DRM_DEBUG_DRIVER("\n");
 538
 539         /* Copy the drm display mode in the connector local structure */
 540         memcpy(&hdmi->mode, mode, sizeof(struct drm_display_mode));
 541
 542         /* Update clock framerate according to the selected mode */
 543         ret = clk_set_rate(hdmi->clk_pix, mode->clock * 1000);
 544         if (ret < 0) {
 545                 DRM_ERROR("Cannot set rate (%dHz) for hdmi_pix clk\n",
 546                           mode->clock * 1000);
 547                 return;
 548         }
 549         ret = clk_set_rate(hdmi->clk_phy, mode->clock * 1000);
 550         if (ret < 0) {
 551                 DRM_ERROR("Cannot set rate (%dHz) for hdmi_rejection_pll clk\n",
 552                           mode->clock * 1000);
 553                 return;
 554         }
 555 }
 556
 557 static void sti_hdmi_bridge_nope(struct drm_bridge *bridge)
 558 {
 559         /* do nothing */
 560 }
 561
 562 static const struct drm_bridge_funcs sti_hdmi_bridge_funcs = {
 563         .pre_enable = sti_hdmi_pre_enable,
 564         .enable = sti_hdmi_bridge_nope,
 565         .disable = sti_hdmi_disable,
 566         .post_disable = sti_hdmi_bridge_nope,
 567         .mode_set = sti_hdmi_set_mode,
 568 };
 569
 570 static int sti_hdmi_connector_get_modes(struct drm_connector *connector)
 571 {
 572         struct sti_hdmi_connector *hdmi_connector
 573                 = to_sti_hdmi_connector(connector);
 574         struct sti_hdmi *hdmi = hdmi_connector->hdmi;
 575         struct edid *edid;
 576         int count;
 577
 578         DRM_DEBUG_DRIVER("\n");
 579
 580         edid = drm_get_edid(connector, hdmi->ddc_adapt);
 581         if (!edid)
 582                 goto fail;
 583
 584         count = drm_add_edid_modes(connector, edid);
 585         drm_mode_connector_update_edid_property(connector, edid);
 586
 587         kfree(edid);
 588         return count;
 589
 590 fail:
 591         DRM_ERROR("Can not read HDMI EDID\n");
 592         return 0;
 593 }
 594
 595 #define CLK_TOLERANCE_HZ 50
 596
 597 static int sti_hdmi_connector_mode_valid(struct drm_connector *connector,
 598                                         struct drm_display_mode *mode)
 599 {
 600         int target = mode->clock * 1000;
 601         int target_min = target - CLK_TOLERANCE_HZ;
 602         int target_max = target + CLK_TOLERANCE_HZ;
 603         int result;
 604         struct sti_hdmi_connector *hdmi_connector
 605                 = to_sti_hdmi_connector(connector);
 606         struct sti_hdmi *hdmi = hdmi_connector->hdmi;
 607
 608
 609         result = clk_round_rate(hdmi->clk_pix, target);
 610
 611         DRM_DEBUG_DRIVER("target rate = %d => available rate = %d\n",
 612                          target, result);
 613
 614         if ((result < target_min) || (result > target_max)) {
 615                 DRM_DEBUG_DRIVER("hdmi pixclk=%d not supported\n", target);
 616                 return MODE_BAD;
 617         }
 618
 619         return MODE_OK;
 620 }
 621
 622 struct drm_encoder *sti_hdmi_best_encoder(struct drm_connector *connector)
 623 {
 624         struct sti_hdmi_connector *hdmi_connector
 625                 = to_sti_hdmi_connector(connector);
 626
 627         /* Best encoder is the one associated during connector creation */
 628         return hdmi_connector->encoder;
 629 }
 630
 631 static struct drm_connector_helper_funcs sti_hdmi_connector_helper_funcs = {
 632         .get_modes = sti_hdmi_connector_get_modes,
 633         .mode_valid = sti_hdmi_connector_mode_valid,
 634         .best_encoder = sti_hdmi_best_encoder,
 635 };
 636
 637 /* get detection status of display device */
 638 static enum drm_connector_status
 639 sti_hdmi_connector_detect(struct drm_connector *connector, bool force)
 640 {
 641         struct sti_hdmi_connector *hdmi_connector
 642                 = to_sti_hdmi_connector(connector);
 643         struct sti_hdmi *hdmi = hdmi_connector->hdmi;
 644
 645         DRM_DEBUG_DRIVER("\n");
 646
 647         if (hdmi->hpd) {
 648                 DRM_DEBUG_DRIVER("hdmi cable connected\n");
 649                 return connector_status_connected;
 650         }
 651
 652         DRM_DEBUG_DRIVER("hdmi cable disconnected\n");
 653         return connector_status_disconnected;
 654 }
 655
 656 static void sti_hdmi_connector_destroy(struct drm_connector *connector)
 657 {
 658         struct sti_hdmi_connector *hdmi_connector
 659                 = to_sti_hdmi_connector(connector);
 660
 661         drm_connector_unregister(connector);
 662         drm_connector_cleanup(connector);
 663         kfree(hdmi_connector);
 664 }
 665
 666 static struct drm_connector_funcs sti_hdmi_connector_funcs = {
 667         .dpms = drm_atomic_helper_connector_dpms,
 668         .fill_modes = drm_helper_probe_single_connector_modes,
 669         .detect = sti_hdmi_connector_detect,
 670         .destroy = sti_hdmi_connector_destroy,
 671         .reset = drm_atomic_helper_connector_reset,
 672         .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
 673         .atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
 674 };
 675
 676 static struct drm_encoder *sti_hdmi_find_encoder(struct drm_device *dev)
 677 {
 678         struct drm_encoder *encoder;
 679
 680         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
 681                 if (encoder->encoder_type == DRM_MODE_ENCODER_TMDS)
 682                         return encoder;
 683         }
 684
 685         return NULL;
 686 }
 687
 688 static int sti_hdmi_bind(struct device *dev, struct device *master, void *data)
 689 {
 690         struct sti_hdmi *hdmi = dev_get_drvdata(dev);
 691         struct drm_device *drm_dev = data;
 692         struct drm_encoder *encoder;
 693         struct sti_hdmi_connector *connector;
 694         struct drm_connector *drm_connector;
 695         struct drm_bridge *bridge;
 696         struct device_node *ddc;
 697         int err;
 698
 699         ddc = of_parse_phandle(dev->of_node, "ddc", 0);
 700         if (ddc) {
 701                 hdmi->ddc_adapt = of_find_i2c_adapter_by_node(ddc);
 702                 if (!hdmi->ddc_adapt) {
 703                         err = -EPROBE_DEFER;
 704                         of_node_put(ddc);
 705                         return err;
 706                 }
 707
 708                 of_node_put(ddc);
 709         }
 710
 711         /* Set the drm device handle */
 712         hdmi->drm_dev = drm_dev;
 713
 714         encoder = sti_hdmi_find_encoder(drm_dev);
 715         if (!encoder)
 716                 goto err_adapt;
 717
 718         connector = devm_kzalloc(dev, sizeof(*connector), GFP_KERNEL);
 719         if (!connector)
 720                 goto err_adapt;
 721
 722
 723         connector->hdmi = hdmi;
 724
 725         bridge = devm_kzalloc(dev, sizeof(*bridge), GFP_KERNEL);
 726         if (!bridge)
 727                 goto err_adapt;
 728
 729         bridge->driver_private = hdmi;
 730         bridge->funcs = &sti_hdmi_bridge_funcs;
 731         drm_bridge_attach(drm_dev, bridge);
 732
 733         encoder->bridge = bridge;
 734         connector->encoder = encoder;
 735
 736         drm_connector = (struct drm_connector *)connector;
 737
 738         drm_connector->polled = DRM_CONNECTOR_POLL_HPD;
 739
 740         drm_connector_init(drm_dev, drm_connector,
 741                         &sti_hdmi_connector_funcs, DRM_MODE_CONNECTOR_HDMIA);
 742         drm_connector_helper_add(drm_connector,
 743                         &sti_hdmi_connector_helper_funcs);
 744
 745         err = drm_connector_register(drm_connector);
 746         if (err)
 747                 goto err_connector;
 748
 749         err = drm_mode_connector_attach_encoder(drm_connector, encoder);
 750         if (err) {
 751                 DRM_ERROR("Failed to attach a connector to a encoder\n");
 752                 goto err_sysfs;
 753         }
 754
 755         /* Enable default interrupts */
 756         hdmi_write(hdmi, HDMI_DEFAULT_INT, HDMI_INT_EN);
 757
 758         return 0;
 759
 760 err_sysfs:
 761         drm_connector_unregister(drm_connector);
 762 err_connector:
 763         drm_connector_cleanup(drm_connector);
 764 err_adapt:
 765         put_device(&hdmi->ddc_adapt->dev);
 766         return -EINVAL;
 767 }
 768
 769 static void sti_hdmi_unbind(struct device *dev,
 770                 struct device *master, void *data)
 771 {
 772         /* do nothing */
 773 }
 774
 775 static const struct component_ops sti_hdmi_ops = {
 776         .bind = sti_hdmi_bind,
 777         .unbind = sti_hdmi_unbind,
 778 };
 779
 780 static const struct of_device_id hdmi_of_match[] = {
 781         {
 782                 .compatible = "st,stih416-hdmi",
 783                 .data = &tx3g0c55phy_ops,
 784         }, {
 785                 .compatible = "st,stih407-hdmi",
 786                 .data = &tx3g4c28phy_ops,
 787         }, {
 788                 /* end node */
 789         }
 790 };
 791 MODULE_DEVICE_TABLE(of, hdmi_of_match);
 792
 793 static int sti_hdmi_probe(struct platform_device *pdev)
 794 {
 795         struct device *dev = &pdev->dev;
 796         struct sti_hdmi *hdmi;
 797         struct device_node *np = dev->of_node;
 798         struct resource *res;
 799         int ret;
 800
 801         DRM_INFO("%s\n", __func__);
 802
 803         hdmi = devm_kzalloc(dev, sizeof(*hdmi), GFP_KERNEL);
 804         if (!hdmi)
 805                 return -ENOMEM;
 806
 807         hdmi->dev = pdev->dev;
 808
 809         /* Get resources */
 810         res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "hdmi-reg");
 811         if (!res) {
 812                 DRM_ERROR("Invalid hdmi resource\n");
 813                 return -ENOMEM;
 814         }
 815         hdmi->regs = devm_ioremap_nocache(dev, res->start, resource_size(res));
 816         if (!hdmi->regs)
 817                 return -ENOMEM;
 818
 819         if (of_device_is_compatible(np, "st,stih416-hdmi")) {
 820                 res = platform_get_resource_byname(pdev, IORESOURCE_MEM,
 821                                                    "syscfg");
 822                 if (!res) {
 823                         DRM_ERROR("Invalid syscfg resource\n");
 824                         return -ENOMEM;
 825                 }
 826                 hdmi->syscfg = devm_ioremap_nocache(dev, res->start,
 827                                                     resource_size(res));
 828                 if (!hdmi->syscfg)
 829                         return -ENOMEM;
 830
 831         }
 832
 833         hdmi->phy_ops = (struct hdmi_phy_ops *)
 834                 of_match_node(hdmi_of_match, np)->data;
 835
 836         /* Get clock resources */
 837         hdmi->clk_pix = devm_clk_get(dev, "pix");
 838         if (IS_ERR(hdmi->clk_pix)) {
 839                 DRM_ERROR("Cannot get hdmi_pix clock\n");
 840                 return PTR_ERR(hdmi->clk_pix);
 841         }
 842
 843         hdmi->clk_tmds = devm_clk_get(dev, "tmds");
 844         if (IS_ERR(hdmi->clk_tmds)) {
 845                 DRM_ERROR("Cannot get hdmi_tmds clock\n");
 846                 return PTR_ERR(hdmi->clk_tmds);
 847         }
 848
 849         hdmi->clk_phy = devm_clk_get(dev, "phy");
 850         if (IS_ERR(hdmi->clk_phy)) {
 851                 DRM_ERROR("Cannot get hdmi_phy clock\n");
 852                 return PTR_ERR(hdmi->clk_phy);
 853         }
 854
 855         hdmi->clk_audio = devm_clk_get(dev, "audio");
 856         if (IS_ERR(hdmi->clk_audio)) {
 857                 DRM_ERROR("Cannot get hdmi_audio clock\n");
 858                 return PTR_ERR(hdmi->clk_audio);
 859         }
 860
 861         hdmi->hpd = readl(hdmi->regs + HDMI_STA) & HDMI_STA_HOT_PLUG;
 862
 863         init_waitqueue_head(&hdmi->wait_event);
 864
 865         hdmi->irq = platform_get_irq_byname(pdev, "irq");
 866
 867         ret = devm_request_threaded_irq(dev, hdmi->irq, hdmi_irq,
 868                         hdmi_irq_thread, IRQF_ONESHOT, dev_name(dev), hdmi);
 869         if (ret) {
 870                 DRM_ERROR("Failed to register HDMI interrupt\n");
 871                 return ret;
 872         }
 873
 874         hdmi->reset = devm_reset_control_get(dev, "hdmi");
 875         /* Take hdmi out of reset */
 876         if (!IS_ERR(hdmi->reset))
 877                 reset_control_deassert(hdmi->reset);
 878
 879         platform_set_drvdata(pdev, hdmi);
 880
 881         return component_add(&pdev->dev, &sti_hdmi_ops);
 882 }
 883
 884 static int sti_hdmi_remove(struct platform_device *pdev)
 885 {
 886         struct sti_hdmi *hdmi = dev_get_drvdata(&pdev->dev);
 887
 888         if (hdmi->ddc_adapt)
 889                 put_device(&hdmi->ddc_adapt->dev);
 890
 891         component_del(&pdev->dev, &sti_hdmi_ops);
 892         return 0;
 893 }
 894
 895 struct platform_driver sti_hdmi_driver = {
 896         .driver = {
 897                 .name = "sti-hdmi",
 898                 .owner = THIS_MODULE,
 899                 .of_match_table = hdmi_of_match,
 900         },
 901         .probe = sti_hdmi_probe,
 902         .remove = sti_hdmi_remove,
 903 };
 904
 905 module_platform_driver(sti_hdmi_driver);
 906
 907 MODULE_AUTHOR("Benjamin Gaignard <benjamin.gaignard@st.com>");
 908 MODULE_DESCRIPTION("STMicroelectronics SoC DRM driver");
 909 MODULE_LICENSE("GPL");