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