drivers/gpu/drm/zte/zx_hdmi.c

   1 /*
   2  * Copyright 2016 Linaro Ltd.
   3  * Copyright 2016 ZTE Corporation.
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License version 2 as
   7  * published by the Free Software Foundation.
   8  *
   9  */
  10
  11 #include <linux/clk.h>
  12 #include <linux/component.h>
  13 #include <linux/delay.h>
  14 #include <linux/err.h>
  15 #include <linux/hdmi.h>
  16 #include <linux/irq.h>
  17 #include <linux/mfd/syscon.h>
  18 #include <linux/module.h>
  19 #include <linux/mutex.h>
  20 #include <linux/of_device.h>
  21
  22 #include <drm/drm_atomic_helper.h>
  23 #include <drm/drm_crtc_helper.h>
  24 #include <drm/drm_edid.h>
  25 #include <drm/drm_of.h>
  26 #include <drm/drmP.h>
  27
  28 #include <sound/hdmi-codec.h>
  29
  30 #include "zx_hdmi_regs.h"
  31 #include "zx_vou.h"
  32
  33 #define ZX_HDMI_INFOFRAME_SIZE          31
  34 #define DDC_SEGMENT_ADDR                0x30
  35
  36 struct zx_hdmi_i2c {
  37         struct i2c_adapter adap;
  38         struct mutex lock;
  39 };
  40
  41 struct zx_hdmi {
  42         struct drm_connector connector;
  43         struct drm_encoder encoder;
  44         struct zx_hdmi_i2c *ddc;
  45         struct device *dev;
  46         struct drm_device *drm;
  47         void __iomem *mmio;
  48         struct clk *cec_clk;
  49         struct clk *osc_clk;
  50         struct clk *xclk;
  51         bool sink_is_hdmi;
  52         bool sink_has_audio;
  53         struct platform_device *audio_pdev;
  54 };
  55
  56 #define to_zx_hdmi(x) container_of(x, struct zx_hdmi, x)
  57
  58 static inline u8 hdmi_readb(struct zx_hdmi *hdmi, u16 offset)
  59 {
  60         return readl_relaxed(hdmi->mmio + offset * 4);
  61 }
  62
  63 static inline void hdmi_writeb(struct zx_hdmi *hdmi, u16 offset, u8 val)
  64 {
  65         writel_relaxed(val, hdmi->mmio + offset * 4);
  66 }
  67
  68 static inline void hdmi_writeb_mask(struct zx_hdmi *hdmi, u16 offset,
  69                                     u8 mask, u8 val)
  70 {
  71         u8 tmp;
  72
  73         tmp = hdmi_readb(hdmi, offset);
  74         tmp = (tmp & ~mask) | (val & mask);
  75         hdmi_writeb(hdmi, offset, tmp);
  76 }
  77
  78 static int zx_hdmi_infoframe_trans(struct zx_hdmi *hdmi,
  79                                    union hdmi_infoframe *frame, u8 fsel)
  80 {
  81         u8 buffer[ZX_HDMI_INFOFRAME_SIZE];
  82         int num;
  83         int i;
  84
  85         hdmi_writeb(hdmi, TPI_INFO_FSEL, fsel);
  86
  87         num = hdmi_infoframe_pack(frame, buffer, ZX_HDMI_INFOFRAME_SIZE);
  88         if (num < 0) {
  89                 DRM_DEV_ERROR(hdmi->dev, "failed to pack infoframe: %d\n", num);
  90                 return num;
  91         }
  92
  93         for (i = 0; i < num; i++)
  94                 hdmi_writeb(hdmi, TPI_INFO_B0 + i, buffer[i]);
  95
  96         hdmi_writeb_mask(hdmi, TPI_INFO_EN, TPI_INFO_TRANS_RPT,
  97                          TPI_INFO_TRANS_RPT);
  98         hdmi_writeb_mask(hdmi, TPI_INFO_EN, TPI_INFO_TRANS_EN,
  99                          TPI_INFO_TRANS_EN);
 100
 101         return num;
 102 }
 103
 104 static int zx_hdmi_config_video_vsi(struct zx_hdmi *hdmi,
 105                                     struct drm_display_mode *mode)
 106 {
 107         union hdmi_infoframe frame;
 108         int ret;
 109
 110         ret = drm_hdmi_vendor_infoframe_from_display_mode(&frame.vendor.hdmi,
 111                                                           &hdmi->connector,
 112                                                           mode);
 113         if (ret) {
 114                 DRM_DEV_ERROR(hdmi->dev, "failed to get vendor infoframe: %d\n",
 115                               ret);
 116                 return ret;
 117         }
 118
 119         return zx_hdmi_infoframe_trans(hdmi, &frame, FSEL_VSIF);
 120 }
 121
 122 static int zx_hdmi_config_video_avi(struct zx_hdmi *hdmi,
 123                                     struct drm_display_mode *mode)
 124 {
 125         union hdmi_infoframe frame;
 126         int ret;
 127
 128         ret = drm_hdmi_avi_infoframe_from_display_mode(&frame.avi, mode, false);
 129         if (ret) {
 130                 DRM_DEV_ERROR(hdmi->dev, "failed to get avi infoframe: %d\n",
 131                               ret);
 132                 return ret;
 133         }
 134
 135         /* We always use YUV444 for HDMI output. */
 136         frame.avi.colorspace = HDMI_COLORSPACE_YUV444;
 137
 138         return zx_hdmi_infoframe_trans(hdmi, &frame, FSEL_AVI);
 139 }
 140
 141 static void zx_hdmi_encoder_mode_set(struct drm_encoder *encoder,
 142                                      struct drm_display_mode *mode,
 143                                      struct drm_display_mode *adj_mode)
 144 {
 145         struct zx_hdmi *hdmi = to_zx_hdmi(encoder);
 146
 147         if (hdmi->sink_is_hdmi) {
 148                 zx_hdmi_config_video_avi(hdmi, mode);
 149                 zx_hdmi_config_video_vsi(hdmi, mode);
 150         }
 151 }
 152
 153 static void zx_hdmi_phy_start(struct zx_hdmi *hdmi)
 154 {
 155         /* Copy from ZTE BSP code */
 156         hdmi_writeb(hdmi, 0x222, 0x0);
 157         hdmi_writeb(hdmi, 0x224, 0x4);
 158         hdmi_writeb(hdmi, 0x909, 0x0);
 159         hdmi_writeb(hdmi, 0x7b0, 0x90);
 160         hdmi_writeb(hdmi, 0x7b1, 0x00);
 161         hdmi_writeb(hdmi, 0x7b2, 0xa7);
 162         hdmi_writeb(hdmi, 0x7b8, 0xaa);
 163         hdmi_writeb(hdmi, 0x7b2, 0xa7);
 164         hdmi_writeb(hdmi, 0x7b3, 0x0f);
 165         hdmi_writeb(hdmi, 0x7b4, 0x0f);
 166         hdmi_writeb(hdmi, 0x7b5, 0x55);
 167         hdmi_writeb(hdmi, 0x7b7, 0x03);
 168         hdmi_writeb(hdmi, 0x7b9, 0x12);
 169         hdmi_writeb(hdmi, 0x7ba, 0x32);
 170         hdmi_writeb(hdmi, 0x7bc, 0x68);
 171         hdmi_writeb(hdmi, 0x7be, 0x40);
 172         hdmi_writeb(hdmi, 0x7bf, 0x84);
 173         hdmi_writeb(hdmi, 0x7c1, 0x0f);
 174         hdmi_writeb(hdmi, 0x7c8, 0x02);
 175         hdmi_writeb(hdmi, 0x7c9, 0x03);
 176         hdmi_writeb(hdmi, 0x7ca, 0x40);
 177         hdmi_writeb(hdmi, 0x7dc, 0x31);
 178         hdmi_writeb(hdmi, 0x7e2, 0x04);
 179         hdmi_writeb(hdmi, 0x7e0, 0x06);
 180         hdmi_writeb(hdmi, 0x7cb, 0x68);
 181         hdmi_writeb(hdmi, 0x7f9, 0x02);
 182         hdmi_writeb(hdmi, 0x7b6, 0x02);
 183         hdmi_writeb(hdmi, 0x7f3, 0x0);
 184 }
 185
 186 static void zx_hdmi_hw_enable(struct zx_hdmi *hdmi)
 187 {
 188         /* Enable pclk */
 189         hdmi_writeb_mask(hdmi, CLKPWD, CLKPWD_PDIDCK, CLKPWD_PDIDCK);
 190
 191         /* Enable HDMI for TX */
 192         hdmi_writeb_mask(hdmi, FUNC_SEL, FUNC_HDMI_EN, FUNC_HDMI_EN);
 193
 194         /* Enable deep color packet */
 195         hdmi_writeb_mask(hdmi, P2T_CTRL, P2T_DC_PKT_EN, P2T_DC_PKT_EN);
 196
 197         /* Enable HDMI/MHL mode for output */
 198         hdmi_writeb_mask(hdmi, TEST_TXCTRL, TEST_TXCTRL_HDMI_MODE,
 199                          TEST_TXCTRL_HDMI_MODE);
 200
 201         /* Configure reg_qc_sel */
 202         hdmi_writeb(hdmi, HDMICTL4, 0x3);
 203
 204         /* Enable interrupt */
 205         hdmi_writeb_mask(hdmi, INTR1_MASK, INTR1_MONITOR_DETECT,
 206                          INTR1_MONITOR_DETECT);
 207
 208         /* Start up phy */
 209         zx_hdmi_phy_start(hdmi);
 210 }
 211
 212 static void zx_hdmi_hw_disable(struct zx_hdmi *hdmi)
 213 {
 214         /* Disable interrupt */
 215         hdmi_writeb_mask(hdmi, INTR1_MASK, INTR1_MONITOR_DETECT, 0);
 216
 217         /* Disable deep color packet */
 218         hdmi_writeb_mask(hdmi, P2T_CTRL, P2T_DC_PKT_EN, P2T_DC_PKT_EN);
 219
 220         /* Disable HDMI for TX */
 221         hdmi_writeb_mask(hdmi, FUNC_SEL, FUNC_HDMI_EN, 0);
 222
 223         /* Disable pclk */
 224         hdmi_writeb_mask(hdmi, CLKPWD, CLKPWD_PDIDCK, 0);
 225 }
 226
 227 static void zx_hdmi_encoder_enable(struct drm_encoder *encoder)
 228 {
 229         struct zx_hdmi *hdmi = to_zx_hdmi(encoder);
 230
 231         clk_prepare_enable(hdmi->cec_clk);
 232         clk_prepare_enable(hdmi->osc_clk);
 233         clk_prepare_enable(hdmi->xclk);
 234
 235         zx_hdmi_hw_enable(hdmi);
 236
 237         vou_inf_enable(VOU_HDMI, encoder->crtc);
 238 }
 239
 240 static void zx_hdmi_encoder_disable(struct drm_encoder *encoder)
 241 {
 242         struct zx_hdmi *hdmi = to_zx_hdmi(encoder);
 243
 244         vou_inf_disable(VOU_HDMI, encoder->crtc);
 245
 246         zx_hdmi_hw_disable(hdmi);
 247
 248         clk_disable_unprepare(hdmi->xclk);
 249         clk_disable_unprepare(hdmi->osc_clk);
 250         clk_disable_unprepare(hdmi->cec_clk);
 251 }
 252
 253 static const struct drm_encoder_helper_funcs zx_hdmi_encoder_helper_funcs = {
 254         .enable = zx_hdmi_encoder_enable,
 255         .disable = zx_hdmi_encoder_disable,
 256         .mode_set = zx_hdmi_encoder_mode_set,
 257 };
 258
 259 static const struct drm_encoder_funcs zx_hdmi_encoder_funcs = {
 260         .destroy = drm_encoder_cleanup,
 261 };
 262
 263 static int zx_hdmi_connector_get_modes(struct drm_connector *connector)
 264 {
 265         struct zx_hdmi *hdmi = to_zx_hdmi(connector);
 266         struct edid *edid;
 267         int ret;
 268
 269         edid = drm_get_edid(connector, &hdmi->ddc->adap);
 270         if (!edid)
 271                 return 0;
 272
 273         hdmi->sink_is_hdmi = drm_detect_hdmi_monitor(edid);
 274         hdmi->sink_has_audio = drm_detect_monitor_audio(edid);
 275         drm_connector_update_edid_property(connector, edid);
 276         ret = drm_add_edid_modes(connector, edid);
 277         kfree(edid);
 278
 279         return ret;
 280 }
 281
 282 static enum drm_mode_status
 283 zx_hdmi_connector_mode_valid(struct drm_connector *connector,
 284                              struct drm_display_mode *mode)
 285 {
 286         return MODE_OK;
 287 }
 288
 289 static struct drm_connector_helper_funcs zx_hdmi_connector_helper_funcs = {
 290         .get_modes = zx_hdmi_connector_get_modes,
 291         .mode_valid = zx_hdmi_connector_mode_valid,
 292 };
 293
 294 static enum drm_connector_status
 295 zx_hdmi_connector_detect(struct drm_connector *connector, bool force)
 296 {
 297         struct zx_hdmi *hdmi = to_zx_hdmi(connector);
 298
 299         return (hdmi_readb(hdmi, TPI_HPD_RSEN) & TPI_HPD_CONNECTION) ?
 300                 connector_status_connected : connector_status_disconnected;
 301 }
 302
 303 static const struct drm_connector_funcs zx_hdmi_connector_funcs = {
 304         .fill_modes = drm_helper_probe_single_connector_modes,
 305         .detect = zx_hdmi_connector_detect,
 306         .destroy = drm_connector_cleanup,
 307         .reset = drm_atomic_helper_connector_reset,
 308         .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
 309         .atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
 310 };
 311
 312 static int zx_hdmi_register(struct drm_device *drm, struct zx_hdmi *hdmi)
 313 {
 314         struct drm_encoder *encoder = &hdmi->encoder;
 315
 316         encoder->possible_crtcs = VOU_CRTC_MASK;
 317
 318         drm_encoder_init(drm, encoder, &zx_hdmi_encoder_funcs,
 319                          DRM_MODE_ENCODER_TMDS, NULL);
 320         drm_encoder_helper_add(encoder, &zx_hdmi_encoder_helper_funcs);
 321
 322         hdmi->connector.polled = DRM_CONNECTOR_POLL_HPD;
 323
 324         drm_connector_init(drm, &hdmi->connector, &zx_hdmi_connector_funcs,
 325                            DRM_MODE_CONNECTOR_HDMIA);
 326         drm_connector_helper_add(&hdmi->connector,
 327                                  &zx_hdmi_connector_helper_funcs);
 328
 329         drm_connector_attach_encoder(&hdmi->connector, encoder);
 330
 331         return 0;
 332 }
 333
 334 static irqreturn_t zx_hdmi_irq_thread(int irq, void *dev_id)
 335 {
 336         struct zx_hdmi *hdmi = dev_id;
 337
 338         drm_helper_hpd_irq_event(hdmi->connector.dev);
 339
 340         return IRQ_HANDLED;
 341 }
 342
 343 static irqreturn_t zx_hdmi_irq_handler(int irq, void *dev_id)
 344 {
 345         struct zx_hdmi *hdmi = dev_id;
 346         u8 lstat;
 347
 348         lstat = hdmi_readb(hdmi, L1_INTR_STAT);
 349
 350         /* Monitor detect/HPD interrupt */
 351         if (lstat & L1_INTR_STAT_INTR1) {
 352                 u8 stat;
 353
 354                 stat = hdmi_readb(hdmi, INTR1_STAT);
 355                 hdmi_writeb(hdmi, INTR1_STAT, stat);
 356
 357                 if (stat & INTR1_MONITOR_DETECT)
 358                         return IRQ_WAKE_THREAD;
 359         }
 360
 361         return IRQ_NONE;
 362 }
 363
 364 static int zx_hdmi_audio_startup(struct device *dev, void *data)
 365 {
 366         struct zx_hdmi *hdmi = dev_get_drvdata(dev);
 367         struct drm_encoder *encoder = &hdmi->encoder;
 368
 369         vou_inf_hdmi_audio_sel(encoder->crtc, VOU_HDMI_AUD_SPDIF);
 370
 371         return 0;
 372 }
 373
 374 static void zx_hdmi_audio_shutdown(struct device *dev, void *data)
 375 {
 376         struct zx_hdmi *hdmi = dev_get_drvdata(dev);
 377
 378         /* Disable audio input */
 379         hdmi_writeb_mask(hdmi, AUD_EN, AUD_IN_EN, 0);
 380 }
 381
 382 static inline int zx_hdmi_audio_get_n(unsigned int fs)
 383 {
 384         unsigned int n;
 385
 386         if (fs && (fs % 44100) == 0)
 387                 n = 6272 * (fs / 44100);
 388         else
 389                 n = fs * 128 / 1000;
 390
 391         return n;
 392 }
 393
 394 static int zx_hdmi_audio_hw_params(struct device *dev,
 395                                    void *data,
 396                                    struct hdmi_codec_daifmt *daifmt,
 397                                    struct hdmi_codec_params *params)
 398 {
 399         struct zx_hdmi *hdmi = dev_get_drvdata(dev);
 400         struct hdmi_audio_infoframe *cea = &params->cea;
 401         union hdmi_infoframe frame;
 402         int n;
 403
 404         /* We only support spdif for now */
 405         if (daifmt->fmt != HDMI_SPDIF) {
 406                 DRM_DEV_ERROR(hdmi->dev, "invalid daifmt %d\n", daifmt->fmt);
 407                 return -EINVAL;
 408         }
 409
 410         switch (params->sample_width) {
 411         case 16:
 412                 hdmi_writeb_mask(hdmi, TPI_AUD_CONFIG, SPDIF_SAMPLE_SIZE_MASK,
 413                                  SPDIF_SAMPLE_SIZE_16BIT);
 414                 break;
 415         case 20:
 416                 hdmi_writeb_mask(hdmi, TPI_AUD_CONFIG, SPDIF_SAMPLE_SIZE_MASK,
 417                                  SPDIF_SAMPLE_SIZE_20BIT);
 418                 break;
 419         case 24:
 420                 hdmi_writeb_mask(hdmi, TPI_AUD_CONFIG, SPDIF_SAMPLE_SIZE_MASK,
 421                                  SPDIF_SAMPLE_SIZE_24BIT);
 422                 break;
 423         default:
 424                 DRM_DEV_ERROR(hdmi->dev, "invalid sample width %d\n",
 425                               params->sample_width);
 426                 return -EINVAL;
 427         }
 428
 429         /* CTS is calculated by hardware, and we only need to take care of N */
 430         n = zx_hdmi_audio_get_n(params->sample_rate);
 431         hdmi_writeb(hdmi, N_SVAL1, n & 0xff);
 432         hdmi_writeb(hdmi, N_SVAL2, (n >> 8) & 0xff);
 433         hdmi_writeb(hdmi, N_SVAL3, (n >> 16) & 0xf);
 434
 435         /* Enable spdif mode */
 436         hdmi_writeb_mask(hdmi, AUD_MODE, SPDIF_EN, SPDIF_EN);
 437
 438         /* Enable audio input */
 439         hdmi_writeb_mask(hdmi, AUD_EN, AUD_IN_EN, AUD_IN_EN);
 440
 441         memcpy(&frame.audio, cea, sizeof(*cea));
 442
 443         return zx_hdmi_infoframe_trans(hdmi, &frame, FSEL_AUDIO);
 444 }
 445
 446 static int zx_hdmi_audio_digital_mute(struct device *dev, void *data,
 447                                       bool enable)
 448 {
 449         struct zx_hdmi *hdmi = dev_get_drvdata(dev);
 450
 451         if (enable)
 452                 hdmi_writeb_mask(hdmi, TPI_AUD_CONFIG, TPI_AUD_MUTE,
 453                                  TPI_AUD_MUTE);
 454         else
 455                 hdmi_writeb_mask(hdmi, TPI_AUD_CONFIG, TPI_AUD_MUTE, 0);
 456
 457         return 0;
 458 }
 459
 460 static int zx_hdmi_audio_get_eld(struct device *dev, void *data,
 461                                  uint8_t *buf, size_t len)
 462 {
 463         struct zx_hdmi *hdmi = dev_get_drvdata(dev);
 464         struct drm_connector *connector = &hdmi->connector;
 465
 466         memcpy(buf, connector->eld, min(sizeof(connector->eld), len));
 467
 468         return 0;
 469 }
 470
 471 static const struct hdmi_codec_ops zx_hdmi_codec_ops = {
 472         .audio_startup = zx_hdmi_audio_startup,
 473         .hw_params = zx_hdmi_audio_hw_params,
 474         .audio_shutdown = zx_hdmi_audio_shutdown,
 475         .digital_mute = zx_hdmi_audio_digital_mute,
 476         .get_eld = zx_hdmi_audio_get_eld,
 477 };
 478
 479 static struct hdmi_codec_pdata zx_hdmi_codec_pdata = {
 480         .ops = &zx_hdmi_codec_ops,
 481         .spdif = 1,
 482 };
 483
 484 static int zx_hdmi_audio_register(struct zx_hdmi *hdmi)
 485 {
 486         struct platform_device *pdev;
 487
 488         pdev = platform_device_register_data(hdmi->dev, HDMI_CODEC_DRV_NAME,
 489                                              PLATFORM_DEVID_AUTO,
 490                                              &zx_hdmi_codec_pdata,
 491                                              sizeof(zx_hdmi_codec_pdata));
 492         if (IS_ERR(pdev))
 493                 return PTR_ERR(pdev);
 494
 495         hdmi->audio_pdev = pdev;
 496
 497         return 0;
 498 }
 499
 500 static int zx_hdmi_i2c_read(struct zx_hdmi *hdmi, struct i2c_msg *msg)
 501 {
 502         int len = msg->len;
 503         u8 *buf = msg->buf;
 504         int retry = 0;
 505         int ret = 0;
 506
 507         /* Bits [9:8] of bytes */
 508         hdmi_writeb(hdmi, ZX_DDC_DIN_CNT2, (len >> 8) & 0xff);
 509         /* Bits [7:0] of bytes */
 510         hdmi_writeb(hdmi, ZX_DDC_DIN_CNT1, len & 0xff);
 511
 512         /* Clear FIFO */
 513         hdmi_writeb_mask(hdmi, ZX_DDC_CMD, DDC_CMD_MASK, DDC_CMD_CLEAR_FIFO);
 514
 515         /* Kick off the read */
 516         hdmi_writeb_mask(hdmi, ZX_DDC_CMD, DDC_CMD_MASK,
 517                          DDC_CMD_SEQUENTIAL_READ);
 518
 519         while (len > 0) {
 520                 int cnt, i;
 521
 522                 /* FIFO needs some time to get ready */
 523                 usleep_range(500, 1000);
 524
 525                 cnt = hdmi_readb(hdmi, ZX_DDC_DOUT_CNT) & DDC_DOUT_CNT_MASK;
 526                 if (cnt == 0) {
 527                         if (++retry > 5) {
 528                                 DRM_DEV_ERROR(hdmi->dev,
 529                                               "DDC FIFO read timed out!");
 530                                 return -ETIMEDOUT;
 531                         }
 532                         continue;
 533                 }
 534
 535                 for (i = 0; i < cnt; i++)
 536                         *buf++ = hdmi_readb(hdmi, ZX_DDC_DATA);
 537                 len -= cnt;
 538         }
 539
 540         return ret;
 541 }
 542
 543 static int zx_hdmi_i2c_write(struct zx_hdmi *hdmi, struct i2c_msg *msg)
 544 {
 545         /*
 546          * The DDC I2C adapter is only for reading EDID data, so we assume
 547          * that the write to this adapter must be the EDID data offset.
 548          */
 549         if ((msg->len != 1) ||
 550             ((msg->addr != DDC_ADDR) && (msg->addr != DDC_SEGMENT_ADDR)))
 551                 return -EINVAL;
 552
 553         if (msg->addr == DDC_SEGMENT_ADDR)
 554                 hdmi_writeb(hdmi, ZX_DDC_SEGM, msg->addr << 1);
 555         else if (msg->addr == DDC_ADDR)
 556                 hdmi_writeb(hdmi, ZX_DDC_ADDR, msg->addr << 1);
 557
 558         hdmi_writeb(hdmi, ZX_DDC_OFFSET, msg->buf[0]);
 559
 560         return 0;
 561 }
 562
 563 static int zx_hdmi_i2c_xfer(struct i2c_adapter *adap, struct i2c_msg *msgs,
 564                             int num)
 565 {
 566         struct zx_hdmi *hdmi = i2c_get_adapdata(adap);
 567         struct zx_hdmi_i2c *ddc = hdmi->ddc;
 568         int i, ret = 0;
 569
 570         mutex_lock(&ddc->lock);
 571
 572         /* Enable DDC master access */
 573         hdmi_writeb_mask(hdmi, TPI_DDC_MASTER_EN, HW_DDC_MASTER, HW_DDC_MASTER);
 574
 575         for (i = 0; i < num; i++) {
 576                 DRM_DEV_DEBUG(hdmi->dev,
 577                               "xfer: num: %d/%d, len: %d, flags: %#x\n",
 578                               i + 1, num, msgs[i].len, msgs[i].flags);
 579
 580                 if (msgs[i].flags & I2C_M_RD)
 581                         ret = zx_hdmi_i2c_read(hdmi, &msgs[i]);
 582                 else
 583                         ret = zx_hdmi_i2c_write(hdmi, &msgs[i]);
 584
 585                 if (ret < 0)
 586                         break;
 587         }
 588
 589         if (!ret)
 590                 ret = num;
 591
 592         /* Disable DDC master access */
 593         hdmi_writeb_mask(hdmi, TPI_DDC_MASTER_EN, HW_DDC_MASTER, 0);
 594
 595         mutex_unlock(&ddc->lock);
 596
 597         return ret;
 598 }
 599
 600 static u32 zx_hdmi_i2c_func(struct i2c_adapter *adapter)
 601 {
 602         return I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL;
 603 }
 604
 605 static const struct i2c_algorithm zx_hdmi_algorithm = {
 606         .master_xfer    = zx_hdmi_i2c_xfer,
 607         .functionality  = zx_hdmi_i2c_func,
 608 };
 609
 610 static int zx_hdmi_ddc_register(struct zx_hdmi *hdmi)
 611 {
 612         struct i2c_adapter *adap;
 613         struct zx_hdmi_i2c *ddc;
 614         int ret;
 615
 616         ddc = devm_kzalloc(hdmi->dev, sizeof(*ddc), GFP_KERNEL);
 617         if (!ddc)
 618                 return -ENOMEM;
 619
 620         hdmi->ddc = ddc;
 621         mutex_init(&ddc->lock);
 622
 623         adap = &ddc->adap;
 624         adap->owner = THIS_MODULE;
 625         adap->class = I2C_CLASS_DDC;
 626         adap->dev.parent = hdmi->dev;
 627         adap->algo = &zx_hdmi_algorithm;
 628         snprintf(adap->name, sizeof(adap->name), "zx hdmi i2c");
 629
 630         ret = i2c_add_adapter(adap);
 631         if (ret) {
 632                 DRM_DEV_ERROR(hdmi->dev, "failed to add I2C adapter: %d\n",
 633                               ret);
 634                 return ret;
 635         }
 636
 637         i2c_set_adapdata(adap, hdmi);
 638
 639         return 0;
 640 }
 641
 642 static int zx_hdmi_bind(struct device *dev, struct device *master, void *data)
 643 {
 644         struct platform_device *pdev = to_platform_device(dev);
 645         struct drm_device *drm = data;
 646         struct resource *res;
 647         struct zx_hdmi *hdmi;
 648         int irq;
 649         int ret;
 650
 651         hdmi = devm_kzalloc(dev, sizeof(*hdmi), GFP_KERNEL);
 652         if (!hdmi)
 653                 return -ENOMEM;
 654
 655         hdmi->dev = dev;
 656         hdmi->drm = drm;
 657
 658         dev_set_drvdata(dev, hdmi);
 659
 660         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 661         hdmi->mmio = devm_ioremap_resource(dev, res);
 662         if (IS_ERR(hdmi->mmio)) {
 663                 ret = PTR_ERR(hdmi->mmio);
 664                 DRM_DEV_ERROR(dev, "failed to remap hdmi region: %d\n", ret);
 665                 return ret;
 666         }
 667
 668         irq = platform_get_irq(pdev, 0);
 669         if (irq < 0)
 670                 return irq;
 671
 672         hdmi->cec_clk = devm_clk_get(hdmi->dev, "osc_cec");
 673         if (IS_ERR(hdmi->cec_clk)) {
 674                 ret = PTR_ERR(hdmi->cec_clk);
 675                 DRM_DEV_ERROR(dev, "failed to get cec_clk: %d\n", ret);
 676                 return ret;
 677         }
 678
 679         hdmi->osc_clk = devm_clk_get(hdmi->dev, "osc_clk");
 680         if (IS_ERR(hdmi->osc_clk)) {
 681                 ret = PTR_ERR(hdmi->osc_clk);
 682                 DRM_DEV_ERROR(dev, "failed to get osc_clk: %d\n", ret);
 683                 return ret;
 684         }
 685
 686         hdmi->xclk = devm_clk_get(hdmi->dev, "xclk");
 687         if (IS_ERR(hdmi->xclk)) {
 688                 ret = PTR_ERR(hdmi->xclk);
 689                 DRM_DEV_ERROR(dev, "failed to get xclk: %d\n", ret);
 690                 return ret;
 691         }
 692
 693         ret = zx_hdmi_ddc_register(hdmi);
 694         if (ret) {
 695                 DRM_DEV_ERROR(dev, "failed to register ddc: %d\n", ret);
 696                 return ret;
 697         }
 698
 699         ret = zx_hdmi_audio_register(hdmi);
 700         if (ret) {
 701                 DRM_DEV_ERROR(dev, "failed to register audio: %d\n", ret);
 702                 return ret;
 703         }
 704
 705         ret = zx_hdmi_register(drm, hdmi);
 706         if (ret) {
 707                 DRM_DEV_ERROR(dev, "failed to register hdmi: %d\n", ret);
 708                 return ret;
 709         }
 710
 711         ret = devm_request_threaded_irq(dev, irq, zx_hdmi_irq_handler,
 712                                         zx_hdmi_irq_thread, IRQF_SHARED,
 713                                         dev_name(dev), hdmi);
 714         if (ret) {
 715                 DRM_DEV_ERROR(dev, "failed to request threaded irq: %d\n", ret);
 716                 return ret;
 717         }
 718
 719         return 0;
 720 }
 721
 722 static void zx_hdmi_unbind(struct device *dev, struct device *master,
 723                            void *data)
 724 {
 725         struct zx_hdmi *hdmi = dev_get_drvdata(dev);
 726
 727         hdmi->connector.funcs->destroy(&hdmi->connector);
 728         hdmi->encoder.funcs->destroy(&hdmi->encoder);
 729
 730         if (hdmi->audio_pdev)
 731                 platform_device_unregister(hdmi->audio_pdev);
 732 }
 733
 734 static const struct component_ops zx_hdmi_component_ops = {
 735         .bind = zx_hdmi_bind,
 736         .unbind = zx_hdmi_unbind,
 737 };
 738
 739 static int zx_hdmi_probe(struct platform_device *pdev)
 740 {
 741         return component_add(&pdev->dev, &zx_hdmi_component_ops);
 742 }
 743
 744 static int zx_hdmi_remove(struct platform_device *pdev)
 745 {
 746         component_del(&pdev->dev, &zx_hdmi_component_ops);
 747         return 0;
 748 }
 749
 750 static const struct of_device_id zx_hdmi_of_match[] = {
 751         { .compatible = "zte,zx296718-hdmi", },
 752         { /* end */ },
 753 };
 754 MODULE_DEVICE_TABLE(of, zx_hdmi_of_match);
 755
 756 struct platform_driver zx_hdmi_driver = {
 757         .probe = zx_hdmi_probe,
 758         .remove = zx_hdmi_remove,
 759         .driver = {
 760                 .name = "zx-hdmi",
 761                 .of_match_table = zx_hdmi_of_match,
 762         },
 763 };