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         const struct vou_inf *inf;
  54         struct platform_device *audio_pdev;
  55 };
  56
  57 #define to_zx_hdmi(x) container_of(x, struct zx_hdmi, x)
  58
  59 static inline u8 hdmi_readb(struct zx_hdmi *hdmi, u16 offset)
  60 {
  61         return readl_relaxed(hdmi->mmio + offset * 4);
  62 }
  63
  64 static inline void hdmi_writeb(struct zx_hdmi *hdmi, u16 offset, u8 val)
  65 {
  66         writel_relaxed(val, hdmi->mmio + offset * 4);
  67 }
  68
  69 static inline void hdmi_writeb_mask(struct zx_hdmi *hdmi, u16 offset,
  70                                     u8 mask, u8 val)
  71 {
  72         u8 tmp;
  73
  74         tmp = hdmi_readb(hdmi, offset);
  75         tmp = (tmp & ~mask) | (val & mask);
  76         hdmi_writeb(hdmi, offset, tmp);
  77 }
  78
  79 static int zx_hdmi_infoframe_trans(struct zx_hdmi *hdmi,
  80                                    union hdmi_infoframe *frame, u8 fsel)
  81 {
  82         u8 buffer[ZX_HDMI_INFOFRAME_SIZE];
  83         int num;
  84         int i;
  85
  86         hdmi_writeb(hdmi, TPI_INFO_FSEL, fsel);
  87
  88         num = hdmi_infoframe_pack(frame, buffer, ZX_HDMI_INFOFRAME_SIZE);
  89         if (num < 0) {
  90                 DRM_DEV_ERROR(hdmi->dev, "failed to pack infoframe: %d\n", num);
  91                 return num;
  92         }
  93
  94         for (i = 0; i < num; i++)
  95                 hdmi_writeb(hdmi, TPI_INFO_B0 + i, buffer[i]);
  96
  97         hdmi_writeb_mask(hdmi, TPI_INFO_EN, TPI_INFO_TRANS_RPT,
  98                          TPI_INFO_TRANS_RPT);
  99         hdmi_writeb_mask(hdmi, TPI_INFO_EN, TPI_INFO_TRANS_EN,
 100                          TPI_INFO_TRANS_EN);
 101
 102         return num;
 103 }
 104
 105 static int zx_hdmi_config_video_vsi(struct zx_hdmi *hdmi,
 106                                     struct drm_display_mode *mode)
 107 {
 108         union hdmi_infoframe frame;
 109         int ret;
 110
 111         ret = drm_hdmi_vendor_infoframe_from_display_mode(&frame.vendor.hdmi,
 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);
 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_mode_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         .dpms = drm_atomic_helper_connector_dpms,
 305         .fill_modes = drm_helper_probe_single_connector_modes,
 306         .detect = zx_hdmi_connector_detect,
 307         .destroy = drm_connector_cleanup,
 308         .reset = drm_atomic_helper_connector_reset,
 309         .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
 310         .atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
 311 };
 312
 313 static int zx_hdmi_register(struct drm_device *drm, struct zx_hdmi *hdmi)
 314 {
 315         struct drm_encoder *encoder = &hdmi->encoder;
 316
 317         encoder->possible_crtcs = VOU_CRTC_MASK;
 318
 319         drm_encoder_init(drm, encoder, &zx_hdmi_encoder_funcs,
 320                          DRM_MODE_ENCODER_TMDS, NULL);
 321         drm_encoder_helper_add(encoder, &zx_hdmi_encoder_helper_funcs);
 322
 323         hdmi->connector.polled = DRM_CONNECTOR_POLL_HPD;
 324
 325         drm_connector_init(drm, &hdmi->connector, &zx_hdmi_connector_funcs,
 326                            DRM_MODE_CONNECTOR_HDMIA);
 327         drm_connector_helper_add(&hdmi->connector,
 328                                  &zx_hdmi_connector_helper_funcs);
 329
 330         drm_mode_connector_attach_encoder(&hdmi->connector, encoder);
 331
 332         return 0;
 333 }
 334
 335 static irqreturn_t zx_hdmi_irq_thread(int irq, void *dev_id)
 336 {
 337         struct zx_hdmi *hdmi = dev_id;
 338
 339         drm_helper_hpd_irq_event(hdmi->connector.dev);
 340
 341         return IRQ_HANDLED;
 342 }
 343
 344 static irqreturn_t zx_hdmi_irq_handler(int irq, void *dev_id)
 345 {
 346         struct zx_hdmi *hdmi = dev_id;
 347         u8 lstat;
 348
 349         lstat = hdmi_readb(hdmi, L1_INTR_STAT);
 350
 351         /* Monitor detect/HPD interrupt */
 352         if (lstat & L1_INTR_STAT_INTR1) {
 353                 u8 stat;
 354
 355                 stat = hdmi_readb(hdmi, INTR1_STAT);
 356                 hdmi_writeb(hdmi, INTR1_STAT, stat);
 357
 358                 if (stat & INTR1_MONITOR_DETECT)
 359                         return IRQ_WAKE_THREAD;
 360         }
 361
 362         return IRQ_NONE;
 363 }
 364
 365 static int zx_hdmi_audio_startup(struct device *dev, void *data)
 366 {
 367         struct zx_hdmi *hdmi = dev_get_drvdata(dev);
 368         struct drm_encoder *encoder = &hdmi->encoder;
 369
 370         vou_inf_hdmi_audio_sel(encoder->crtc, VOU_HDMI_AUD_SPDIF);
 371
 372         return 0;
 373 }
 374
 375 static void zx_hdmi_audio_shutdown(struct device *dev, void *data)
 376 {
 377         struct zx_hdmi *hdmi = dev_get_drvdata(dev);
 378
 379         /* Disable audio input */
 380         hdmi_writeb_mask(hdmi, AUD_EN, AUD_IN_EN, 0);
 381 }
 382
 383 static inline int zx_hdmi_audio_get_n(unsigned int fs)
 384 {
 385         unsigned int n;
 386
 387         if (fs && (fs % 44100) == 0)
 388                 n = 6272 * (fs / 44100);
 389         else
 390                 n = fs * 128 / 1000;
 391
 392         return n;
 393 }
 394
 395 static int zx_hdmi_audio_hw_params(struct device *dev,
 396                                    void *data,
 397                                    struct hdmi_codec_daifmt *daifmt,
 398                                    struct hdmi_codec_params *params)
 399 {
 400         struct zx_hdmi *hdmi = dev_get_drvdata(dev);
 401         struct hdmi_audio_infoframe *cea = &params->cea;
 402         union hdmi_infoframe frame;
 403         int n;
 404
 405         /* We only support spdif for now */
 406         if (daifmt->fmt != HDMI_SPDIF) {
 407                 DRM_DEV_ERROR(hdmi->dev, "invalid daifmt %d\n", daifmt->fmt);
 408                 return -EINVAL;
 409         }
 410
 411         switch (params->sample_width) {
 412         case 16:
 413                 hdmi_writeb_mask(hdmi, TPI_AUD_CONFIG, SPDIF_SAMPLE_SIZE_MASK,
 414                                  SPDIF_SAMPLE_SIZE_16BIT);
 415                 break;
 416         case 20:
 417                 hdmi_writeb_mask(hdmi, TPI_AUD_CONFIG, SPDIF_SAMPLE_SIZE_MASK,
 418                                  SPDIF_SAMPLE_SIZE_20BIT);
 419                 break;
 420         case 24:
 421                 hdmi_writeb_mask(hdmi, TPI_AUD_CONFIG, SPDIF_SAMPLE_SIZE_MASK,
 422                                  SPDIF_SAMPLE_SIZE_24BIT);
 423                 break;
 424         default:
 425                 DRM_DEV_ERROR(hdmi->dev, "invalid sample width %d\n",
 426                               params->sample_width);
 427                 return -EINVAL;
 428         }
 429
 430         /* CTS is calculated by hardware, and we only need to take care of N */
 431         n = zx_hdmi_audio_get_n(params->sample_rate);
 432         hdmi_writeb(hdmi, N_SVAL1, n & 0xff);
 433         hdmi_writeb(hdmi, N_SVAL2, (n >> 8) & 0xff);
 434         hdmi_writeb(hdmi, N_SVAL3, (n >> 16) & 0xf);
 435
 436         /* Enable spdif mode */
 437         hdmi_writeb_mask(hdmi, AUD_MODE, SPDIF_EN, SPDIF_EN);
 438
 439         /* Enable audio input */
 440         hdmi_writeb_mask(hdmi, AUD_EN, AUD_IN_EN, AUD_IN_EN);
 441
 442         memcpy(&frame.audio, cea, sizeof(*cea));
 443
 444         return zx_hdmi_infoframe_trans(hdmi, &frame, FSEL_AUDIO);
 445 }
 446
 447 static int zx_hdmi_audio_digital_mute(struct device *dev, void *data,
 448                                       bool enable)
 449 {
 450         struct zx_hdmi *hdmi = dev_get_drvdata(dev);
 451
 452         if (enable)
 453                 hdmi_writeb_mask(hdmi, TPI_AUD_CONFIG, TPI_AUD_MUTE,
 454                                  TPI_AUD_MUTE);
 455         else
 456                 hdmi_writeb_mask(hdmi, TPI_AUD_CONFIG, TPI_AUD_MUTE, 0);
 457
 458         return 0;
 459 }
 460
 461 static int zx_hdmi_audio_get_eld(struct device *dev, void *data,
 462                                  uint8_t *buf, size_t len)
 463 {
 464         struct zx_hdmi *hdmi = dev_get_drvdata(dev);
 465         struct drm_connector *connector = &hdmi->connector;
 466
 467         memcpy(buf, connector->eld, min(sizeof(connector->eld), len));
 468
 469         return 0;
 470 }
 471
 472 static const struct hdmi_codec_ops zx_hdmi_codec_ops = {
 473         .audio_startup = zx_hdmi_audio_startup,
 474         .hw_params = zx_hdmi_audio_hw_params,
 475         .audio_shutdown = zx_hdmi_audio_shutdown,
 476         .digital_mute = zx_hdmi_audio_digital_mute,
 477         .get_eld = zx_hdmi_audio_get_eld,
 478 };
 479
 480 static struct hdmi_codec_pdata zx_hdmi_codec_pdata = {
 481         .ops = &zx_hdmi_codec_ops,
 482         .spdif = 1,
 483 };
 484
 485 static int zx_hdmi_audio_register(struct zx_hdmi *hdmi)
 486 {
 487         struct platform_device *pdev;
 488
 489         pdev = platform_device_register_data(hdmi->dev, HDMI_CODEC_DRV_NAME,
 490                                              PLATFORM_DEVID_AUTO,
 491                                              &zx_hdmi_codec_pdata,
 492                                              sizeof(zx_hdmi_codec_pdata));
 493         if (IS_ERR(pdev))
 494                 return PTR_ERR(pdev);
 495
 496         hdmi->audio_pdev = pdev;
 497
 498         return 0;
 499 }
 500
 501 static int zx_hdmi_i2c_read(struct zx_hdmi *hdmi, struct i2c_msg *msg)
 502 {
 503         int len = msg->len;
 504         u8 *buf = msg->buf;
 505         int retry = 0;
 506         int ret = 0;
 507
 508         /* Bits [9:8] of bytes */
 509         hdmi_writeb(hdmi, ZX_DDC_DIN_CNT2, (len >> 8) & 0xff);
 510         /* Bits [7:0] of bytes */
 511         hdmi_writeb(hdmi, ZX_DDC_DIN_CNT1, len & 0xff);
 512
 513         /* Clear FIFO */
 514         hdmi_writeb_mask(hdmi, ZX_DDC_CMD, DDC_CMD_MASK, DDC_CMD_CLEAR_FIFO);
 515
 516         /* Kick off the read */
 517         hdmi_writeb_mask(hdmi, ZX_DDC_CMD, DDC_CMD_MASK,
 518                          DDC_CMD_SEQUENTIAL_READ);
 519
 520         while (len > 0) {
 521                 int cnt, i;
 522
 523                 /* FIFO needs some time to get ready */
 524                 usleep_range(500, 1000);
 525
 526                 cnt = hdmi_readb(hdmi, ZX_DDC_DOUT_CNT) & DDC_DOUT_CNT_MASK;
 527                 if (cnt == 0) {
 528                         if (++retry > 5) {
 529                                 DRM_DEV_ERROR(hdmi->dev,
 530                                               "DDC FIFO read timed out!");
 531                                 return -ETIMEDOUT;
 532                         }
 533                         continue;
 534                 }
 535
 536                 for (i = 0; i < cnt; i++)
 537                         *buf++ = hdmi_readb(hdmi, ZX_DDC_DATA);
 538                 len -= cnt;
 539         }
 540
 541         return ret;
 542 }
 543
 544 static int zx_hdmi_i2c_write(struct zx_hdmi *hdmi, struct i2c_msg *msg)
 545 {
 546         /*
 547          * The DDC I2C adapter is only for reading EDID data, so we assume
 548          * that the write to this adapter must be the EDID data offset.
 549          */
 550         if ((msg->len != 1) ||
 551             ((msg->addr != DDC_ADDR) && (msg->addr != DDC_SEGMENT_ADDR)))
 552                 return -EINVAL;
 553
 554         if (msg->addr == DDC_SEGMENT_ADDR)
 555                 hdmi_writeb(hdmi, ZX_DDC_SEGM, msg->addr << 1);
 556         else if (msg->addr == DDC_ADDR)
 557                 hdmi_writeb(hdmi, ZX_DDC_ADDR, msg->addr << 1);
 558
 559         hdmi_writeb(hdmi, ZX_DDC_OFFSET, msg->buf[0]);
 560
 561         return 0;
 562 }
 563
 564 static int zx_hdmi_i2c_xfer(struct i2c_adapter *adap, struct i2c_msg *msgs,
 565                             int num)
 566 {
 567         struct zx_hdmi *hdmi = i2c_get_adapdata(adap);
 568         struct zx_hdmi_i2c *ddc = hdmi->ddc;
 569         int i, ret = 0;
 570
 571         mutex_lock(&ddc->lock);
 572
 573         /* Enable DDC master access */
 574         hdmi_writeb_mask(hdmi, TPI_DDC_MASTER_EN, HW_DDC_MASTER, HW_DDC_MASTER);
 575
 576         for (i = 0; i < num; i++) {
 577                 DRM_DEV_DEBUG(hdmi->dev,
 578                               "xfer: num: %d/%d, len: %d, flags: %#x\n",
 579                               i + 1, num, msgs[i].len, msgs[i].flags);
 580
 581                 if (msgs[i].flags & I2C_M_RD)
 582                         ret = zx_hdmi_i2c_read(hdmi, &msgs[i]);
 583                 else
 584                         ret = zx_hdmi_i2c_write(hdmi, &msgs[i]);
 585
 586                 if (ret < 0)
 587                         break;
 588         }
 589
 590         if (!ret)
 591                 ret = num;
 592
 593         /* Disable DDC master access */
 594         hdmi_writeb_mask(hdmi, TPI_DDC_MASTER_EN, HW_DDC_MASTER, 0);
 595
 596         mutex_unlock(&ddc->lock);
 597
 598         return ret;
 599 }
 600
 601 static u32 zx_hdmi_i2c_func(struct i2c_adapter *adapter)
 602 {
 603         return I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL;
 604 }
 605
 606 static const struct i2c_algorithm zx_hdmi_algorithm = {
 607         .master_xfer    = zx_hdmi_i2c_xfer,
 608         .functionality  = zx_hdmi_i2c_func,
 609 };
 610
 611 static int zx_hdmi_ddc_register(struct zx_hdmi *hdmi)
 612 {
 613         struct i2c_adapter *adap;
 614         struct zx_hdmi_i2c *ddc;
 615         int ret;
 616
 617         ddc = devm_kzalloc(hdmi->dev, sizeof(*ddc), GFP_KERNEL);
 618         if (!ddc)
 619                 return -ENOMEM;
 620
 621         hdmi->ddc = ddc;
 622         mutex_init(&ddc->lock);
 623
 624         adap = &ddc->adap;
 625         adap->owner = THIS_MODULE;
 626         adap->class = I2C_CLASS_DDC;
 627         adap->dev.parent = hdmi->dev;
 628         adap->algo = &zx_hdmi_algorithm;
 629         snprintf(adap->name, sizeof(adap->name), "zx hdmi i2c");
 630
 631         ret = i2c_add_adapter(adap);
 632         if (ret) {
 633                 DRM_DEV_ERROR(hdmi->dev, "failed to add I2C adapter: %d\n",
 634                               ret);
 635                 return ret;
 636         }
 637
 638         i2c_set_adapdata(adap, hdmi);
 639
 640         return 0;
 641 }
 642
 643 static int zx_hdmi_bind(struct device *dev, struct device *master, void *data)
 644 {
 645         struct platform_device *pdev = to_platform_device(dev);
 646         struct drm_device *drm = data;
 647         struct resource *res;
 648         struct zx_hdmi *hdmi;
 649         int irq;
 650         int ret;
 651
 652         hdmi = devm_kzalloc(dev, sizeof(*hdmi), GFP_KERNEL);
 653         if (!hdmi)
 654                 return -ENOMEM;
 655
 656         hdmi->dev = dev;
 657         hdmi->drm = drm;
 658
 659         dev_set_drvdata(dev, hdmi);
 660
 661         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 662         hdmi->mmio = devm_ioremap_resource(dev, res);
 663         if (IS_ERR(hdmi->mmio)) {
 664                 ret = PTR_ERR(hdmi->mmio);
 665                 DRM_DEV_ERROR(dev, "failed to remap hdmi region: %d\n", ret);
 666                 return ret;
 667         }
 668
 669         irq = platform_get_irq(pdev, 0);
 670         if (irq < 0)
 671                 return irq;
 672
 673         hdmi->cec_clk = devm_clk_get(hdmi->dev, "osc_cec");
 674         if (IS_ERR(hdmi->cec_clk)) {
 675                 ret = PTR_ERR(hdmi->cec_clk);
 676                 DRM_DEV_ERROR(dev, "failed to get cec_clk: %d\n", ret);
 677                 return ret;
 678         }
 679
 680         hdmi->osc_clk = devm_clk_get(hdmi->dev, "osc_clk");
 681         if (IS_ERR(hdmi->osc_clk)) {
 682                 ret = PTR_ERR(hdmi->osc_clk);
 683                 DRM_DEV_ERROR(dev, "failed to get osc_clk: %d\n", ret);
 684                 return ret;
 685         }
 686
 687         hdmi->xclk = devm_clk_get(hdmi->dev, "xclk");
 688         if (IS_ERR(hdmi->xclk)) {
 689                 ret = PTR_ERR(hdmi->xclk);
 690                 DRM_DEV_ERROR(dev, "failed to get xclk: %d\n", ret);
 691                 return ret;
 692         }
 693
 694         ret = zx_hdmi_ddc_register(hdmi);
 695         if (ret) {
 696                 DRM_DEV_ERROR(dev, "failed to register ddc: %d\n", ret);
 697                 return ret;
 698         }
 699
 700         ret = zx_hdmi_audio_register(hdmi);
 701         if (ret) {
 702                 DRM_DEV_ERROR(dev, "failed to register audio: %d\n", ret);
 703                 return ret;
 704         }
 705
 706         ret = zx_hdmi_register(drm, hdmi);
 707         if (ret) {
 708                 DRM_DEV_ERROR(dev, "failed to register hdmi: %d\n", ret);
 709                 return ret;
 710         }
 711
 712         ret = devm_request_threaded_irq(dev, irq, zx_hdmi_irq_handler,
 713                                         zx_hdmi_irq_thread, IRQF_SHARED,
 714                                         dev_name(dev), hdmi);
 715         if (ret) {
 716                 DRM_DEV_ERROR(dev, "failed to request threaded irq: %d\n", ret);
 717                 return ret;
 718         }
 719
 720         return 0;
 721 }
 722
 723 static void zx_hdmi_unbind(struct device *dev, struct device *master,
 724                            void *data)
 725 {
 726         struct zx_hdmi *hdmi = dev_get_drvdata(dev);
 727
 728         hdmi->connector.funcs->destroy(&hdmi->connector);
 729         hdmi->encoder.funcs->destroy(&hdmi->encoder);
 730
 731         if (hdmi->audio_pdev)
 732                 platform_device_unregister(hdmi->audio_pdev);
 733 }
 734
 735 static const struct component_ops zx_hdmi_component_ops = {
 736         .bind = zx_hdmi_bind,
 737         .unbind = zx_hdmi_unbind,
 738 };
 739
 740 static int zx_hdmi_probe(struct platform_device *pdev)
 741 {
 742         return component_add(&pdev->dev, &zx_hdmi_component_ops);
 743 }
 744
 745 static int zx_hdmi_remove(struct platform_device *pdev)
 746 {
 747         component_del(&pdev->dev, &zx_hdmi_component_ops);
 748         return 0;
 749 }
 750
 751 static const struct of_device_id zx_hdmi_of_match[] = {
 752         { .compatible = "zte,zx296718-hdmi", },
 753         { /* end */ },
 754 };
 755 MODULE_DEVICE_TABLE(of, zx_hdmi_of_match);
 756
 757 struct platform_driver zx_hdmi_driver = {
 758         .probe = zx_hdmi_probe,
 759         .remove = zx_hdmi_remove,
 760         .driver = {
 761                 .name = "zx-hdmi",
 762                 .of_match_table = zx_hdmi_of_match,
 763         },
 764 };