drivers/gpu/drm/meson/meson_dw_hdmi.c

   1 /*
   2  * Copyright (C) 2016 BayLibre, SAS
   3  * Author: Neil Armstrong <narmstrong@baylibre.com>
   4  * Copyright (C) 2015 Amlogic, Inc. All rights reserved.
   5  *
   6  * This program is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU General Public License as
   8  * published by the Free Software Foundation; either version 2 of the
   9  * License, or (at your option) any later version.
  10  *
  11  * This program is distributed in the hope that it will be useful, but
  12  * WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  * General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * along with this program; if not, see <http://www.gnu.org/licenses/>.
  18  */
  19
  20 #include <linux/kernel.h>
  21 #include <linux/module.h>
  22 #include <linux/component.h>
  23 #include <linux/of_graph.h>
  24 #include <linux/reset.h>
  25 #include <linux/clk.h>
  26 #include <linux/regulator/consumer.h>
  27
  28 #include <drm/drmP.h>
  29 #include <drm/drm_atomic_helper.h>
  30 #include <drm/drm_edid.h>
  31 #include <drm/drm_probe_helper.h>
  32 #include <drm/bridge/dw_hdmi.h>
  33
  34 #include <uapi/linux/media-bus-format.h>
  35 #include <uapi/linux/videodev2.h>
  36
  37 #include "meson_drv.h"
  38 #include "meson_venc.h"
  39 #include "meson_vclk.h"
  40 #include "meson_dw_hdmi.h"
  41 #include "meson_registers.h"
  42
  43 #define DRIVER_NAME "meson-dw-hdmi"
  44 #define DRIVER_DESC "Amlogic Meson HDMI-TX DRM driver"
  45
  46 /**
  47  * DOC: HDMI Output
  48  *
  49  * HDMI Output is composed of :
  50  *
  51  * - A Synopsys DesignWare HDMI Controller IP
  52  * - A TOP control block controlling the Clocks and PHY
  53  * - A custom HDMI PHY in order convert video to TMDS signal
  54  *
  55  * .. code::
  56  *
  57  *    ___________________________________
  58  *   |            HDMI TOP               |<= HPD
  59  *   |___________________________________|
  60  *   |                  |                |
  61  *   |  Synopsys HDMI   |   HDMI PHY     |=> TMDS
  62  *   |    Controller    |________________|
  63  *   |___________________________________|<=> DDC
  64  *
  65  *
  66  * The HDMI TOP block only supports HPD sensing.
  67  * The Synopsys HDMI Controller interrupt is routed
  68  * through the TOP Block interrupt.
  69  * Communication to the TOP Block and the Synopsys
  70  * HDMI Controller is done a pair of addr+read/write
  71  * registers.
  72  * The HDMI PHY is configured by registers in the
  73  * HHI register block.
  74  *
  75  * Pixel data arrives in 4:4:4 format from the VENC
  76  * block and the VPU HDMI mux selects either the ENCI
  77  * encoder for the 576i or 480i formats or the ENCP
  78  * encoder for all the other formats including
  79  * interlaced HD formats.
  80  * The VENC uses a DVI encoder on top of the ENCI
  81  * or ENCP encoders to generate DVI timings for the
  82  * HDMI controller.
  83  *
  84  * GXBB, GXL and GXM embeds the Synopsys DesignWare
  85  * HDMI TX IP version 2.01a with HDCP and I2C & S/PDIF
  86  * audio source interfaces.
  87  *
  88  * We handle the following features :
  89  *
  90  * - HPD Rise & Fall interrupt
  91  * - HDMI Controller Interrupt
  92  * - HDMI PHY Init for 480i to 1080p60
  93  * - VENC & HDMI Clock setup for 480i to 1080p60
  94  * - VENC Mode setup for 480i to 1080p60
  95  *
  96  * What is missing :
  97  *
  98  * - PHY, Clock and Mode setup for 2k && 4k modes
  99  * - SDDC Scrambling mode for HDMI 2.0a
 100  * - HDCP Setup
 101  * - CEC Management
 102  */
 103
 104 /* TOP Block Communication Channel */
 105 #define HDMITX_TOP_ADDR_REG     0x0
 106 #define HDMITX_TOP_DATA_REG     0x4
 107 #define HDMITX_TOP_CTRL_REG     0x8
 108
 109 /* Controller Communication Channel */
 110 #define HDMITX_DWC_ADDR_REG     0x10
 111 #define HDMITX_DWC_DATA_REG     0x14
 112 #define HDMITX_DWC_CTRL_REG     0x18
 113
 114 /* HHI Registers */
 115 #define HHI_MEM_PD_REG0         0x100 /* 0x40 */
 116 #define HHI_HDMI_CLK_CNTL       0x1cc /* 0x73 */
 117 #define HHI_HDMI_PHY_CNTL0      0x3a0 /* 0xe8 */
 118 #define HHI_HDMI_PHY_CNTL1      0x3a4 /* 0xe9 */
 119 #define HHI_HDMI_PHY_CNTL2      0x3a8 /* 0xea */
 120 #define HHI_HDMI_PHY_CNTL3      0x3ac /* 0xeb */
 121
 122 static DEFINE_SPINLOCK(reg_lock);
 123
 124 enum meson_venc_source {
 125         MESON_VENC_SOURCE_NONE = 0,
 126         MESON_VENC_SOURCE_ENCI = 1,
 127         MESON_VENC_SOURCE_ENCP = 2,
 128 };
 129
 130 struct meson_dw_hdmi {
 131         struct drm_encoder encoder;
 132         struct dw_hdmi_plat_data dw_plat_data;
 133         struct meson_drm *priv;
 134         struct device *dev;
 135         void __iomem *hdmitx;
 136         struct reset_control *hdmitx_apb;
 137         struct reset_control *hdmitx_ctrl;
 138         struct reset_control *hdmitx_phy;
 139         struct clk *hdmi_pclk;
 140         struct clk *venci_clk;
 141         struct regulator *hdmi_supply;
 142         u32 irq_stat;
 143         struct dw_hdmi *hdmi;
 144 };
 145 #define encoder_to_meson_dw_hdmi(x) \
 146         container_of(x, struct meson_dw_hdmi, encoder)
 147
 148 static inline int dw_hdmi_is_compatible(struct meson_dw_hdmi *dw_hdmi,
 149                                         const char *compat)
 150 {
 151         return of_device_is_compatible(dw_hdmi->dev->of_node, compat);
 152 }
 153
 154 /* PHY (via TOP bridge) and Controller dedicated register interface */
 155
 156 static unsigned int dw_hdmi_top_read(struct meson_dw_hdmi *dw_hdmi,
 157                                      unsigned int addr)
 158 {
 159         unsigned long flags;
 160         unsigned int data;
 161
 162         spin_lock_irqsave(&reg_lock, flags);
 163
 164         /* ADDR must be written twice */
 165         writel(addr & 0xffff, dw_hdmi->hdmitx + HDMITX_TOP_ADDR_REG);
 166         writel(addr & 0xffff, dw_hdmi->hdmitx + HDMITX_TOP_ADDR_REG);
 167
 168         /* Read needs a second DATA read */
 169         data = readl(dw_hdmi->hdmitx + HDMITX_TOP_DATA_REG);
 170         data = readl(dw_hdmi->hdmitx + HDMITX_TOP_DATA_REG);
 171
 172         spin_unlock_irqrestore(&reg_lock, flags);
 173
 174         return data;
 175 }
 176
 177 static inline void dw_hdmi_top_write(struct meson_dw_hdmi *dw_hdmi,
 178                                      unsigned int addr, unsigned int data)
 179 {
 180         unsigned long flags;
 181
 182         spin_lock_irqsave(&reg_lock, flags);
 183
 184         /* ADDR must be written twice */
 185         writel(addr & 0xffff, dw_hdmi->hdmitx + HDMITX_TOP_ADDR_REG);
 186         writel(addr & 0xffff, dw_hdmi->hdmitx + HDMITX_TOP_ADDR_REG);
 187
 188         /* Write needs single DATA write */
 189         writel(data, dw_hdmi->hdmitx + HDMITX_TOP_DATA_REG);
 190
 191         spin_unlock_irqrestore(&reg_lock, flags);
 192 }
 193
 194 /* Helper to change specific bits in PHY registers */
 195 static inline void dw_hdmi_top_write_bits(struct meson_dw_hdmi *dw_hdmi,
 196                                           unsigned int addr,
 197                                           unsigned int mask,
 198                                           unsigned int val)
 199 {
 200         unsigned int data = dw_hdmi_top_read(dw_hdmi, addr);
 201
 202         data &= ~mask;
 203         data |= val;
 204
 205         dw_hdmi_top_write(dw_hdmi, addr, data);
 206 }
 207
 208 static unsigned int dw_hdmi_dwc_read(struct meson_dw_hdmi *dw_hdmi,
 209                                      unsigned int addr)
 210 {
 211         unsigned long flags;
 212         unsigned int data;
 213
 214         spin_lock_irqsave(&reg_lock, flags);
 215
 216         /* ADDR must be written twice */
 217         writel(addr & 0xffff, dw_hdmi->hdmitx + HDMITX_DWC_ADDR_REG);
 218         writel(addr & 0xffff, dw_hdmi->hdmitx + HDMITX_DWC_ADDR_REG);
 219
 220         /* Read needs a second DATA read */
 221         data = readl(dw_hdmi->hdmitx + HDMITX_DWC_DATA_REG);
 222         data = readl(dw_hdmi->hdmitx + HDMITX_DWC_DATA_REG);
 223
 224         spin_unlock_irqrestore(&reg_lock, flags);
 225
 226         return data;
 227 }
 228
 229 static inline void dw_hdmi_dwc_write(struct meson_dw_hdmi *dw_hdmi,
 230                                      unsigned int addr, unsigned int data)
 231 {
 232         unsigned long flags;
 233
 234         spin_lock_irqsave(&reg_lock, flags);
 235
 236         /* ADDR must be written twice */
 237         writel(addr & 0xffff, dw_hdmi->hdmitx + HDMITX_DWC_ADDR_REG);
 238         writel(addr & 0xffff, dw_hdmi->hdmitx + HDMITX_DWC_ADDR_REG);
 239
 240         /* Write needs single DATA write */
 241         writel(data, dw_hdmi->hdmitx + HDMITX_DWC_DATA_REG);
 242
 243         spin_unlock_irqrestore(&reg_lock, flags);
 244 }
 245
 246 /* Helper to change specific bits in controller registers */
 247 static inline void dw_hdmi_dwc_write_bits(struct meson_dw_hdmi *dw_hdmi,
 248                                           unsigned int addr,
 249                                           unsigned int mask,
 250                                           unsigned int val)
 251 {
 252         unsigned int data = dw_hdmi_dwc_read(dw_hdmi, addr);
 253
 254         data &= ~mask;
 255         data |= val;
 256
 257         dw_hdmi_dwc_write(dw_hdmi, addr, data);
 258 }
 259
 260 /* Bridge */
 261
 262 /* Setup PHY bandwidth modes */
 263 static void meson_hdmi_phy_setup_mode(struct meson_dw_hdmi *dw_hdmi,
 264                                       struct drm_display_mode *mode)
 265 {
 266         struct meson_drm *priv = dw_hdmi->priv;
 267         unsigned int pixel_clock = mode->clock;
 268
 269         if (dw_hdmi_is_compatible(dw_hdmi, "amlogic,meson-gxl-dw-hdmi") ||
 270             dw_hdmi_is_compatible(dw_hdmi, "amlogic,meson-gxm-dw-hdmi")) {
 271                 if (pixel_clock >= 371250) {
 272                         /* 5.94Gbps, 3.7125Gbps */
 273                         regmap_write(priv->hhi, HHI_HDMI_PHY_CNTL0, 0x333d3282);
 274                         regmap_write(priv->hhi, HHI_HDMI_PHY_CNTL3, 0x2136315b);
 275                 } else if (pixel_clock >= 297000) {
 276                         /* 2.97Gbps */
 277                         regmap_write(priv->hhi, HHI_HDMI_PHY_CNTL0, 0x33303382);
 278                         regmap_write(priv->hhi, HHI_HDMI_PHY_CNTL3, 0x2036315b);
 279                 } else if (pixel_clock >= 148500) {
 280                         /* 1.485Gbps */
 281                         regmap_write(priv->hhi, HHI_HDMI_PHY_CNTL0, 0x33303362);
 282                         regmap_write(priv->hhi, HHI_HDMI_PHY_CNTL3, 0x2016315b);
 283                 } else {
 284                         /* 742.5Mbps, and below */
 285                         regmap_write(priv->hhi, HHI_HDMI_PHY_CNTL0, 0x33604142);
 286                         regmap_write(priv->hhi, HHI_HDMI_PHY_CNTL3, 0x0016315b);
 287                 }
 288         } else if (dw_hdmi_is_compatible(dw_hdmi,
 289                                          "amlogic,meson-gxbb-dw-hdmi")) {
 290                 if (pixel_clock >= 371250) {
 291                         /* 5.94Gbps, 3.7125Gbps */
 292                         regmap_write(priv->hhi, HHI_HDMI_PHY_CNTL0, 0x33353245);
 293                         regmap_write(priv->hhi, HHI_HDMI_PHY_CNTL3, 0x2100115b);
 294                 } else if (pixel_clock >= 297000) {
 295                         /* 2.97Gbps */
 296                         regmap_write(priv->hhi, HHI_HDMI_PHY_CNTL0, 0x33634283);
 297                         regmap_write(priv->hhi, HHI_HDMI_PHY_CNTL3, 0xb000115b);
 298                 } else {
 299                         /* 1.485Gbps, and below */
 300                         regmap_write(priv->hhi, HHI_HDMI_PHY_CNTL0, 0x33632122);
 301                         regmap_write(priv->hhi, HHI_HDMI_PHY_CNTL3, 0x2000115b);
 302                 }
 303         }
 304 }
 305
 306 static inline void meson_dw_hdmi_phy_reset(struct meson_dw_hdmi *dw_hdmi)
 307 {
 308         struct meson_drm *priv = dw_hdmi->priv;
 309
 310         /* Enable and software reset */
 311         regmap_update_bits(priv->hhi, HHI_HDMI_PHY_CNTL1, 0xf, 0xf);
 312
 313         mdelay(2);
 314
 315         /* Enable and unreset */
 316         regmap_update_bits(priv->hhi, HHI_HDMI_PHY_CNTL1, 0xf, 0xe);
 317
 318         mdelay(2);
 319 }
 320
 321 static void dw_hdmi_set_vclk(struct meson_dw_hdmi *dw_hdmi,
 322                              struct drm_display_mode *mode)
 323 {
 324         struct meson_drm *priv = dw_hdmi->priv;
 325         int vic = drm_match_cea_mode(mode);
 326         unsigned int vclk_freq;
 327         unsigned int venc_freq;
 328         unsigned int hdmi_freq;
 329
 330         vclk_freq = mode->clock;
 331
 332         if (!vic) {
 333                 meson_vclk_setup(priv, MESON_VCLK_TARGET_DMT, vclk_freq,
 334                                  vclk_freq, vclk_freq, false);
 335                 return;
 336         }
 337
 338         if (mode->flags & DRM_MODE_FLAG_DBLCLK)
 339                 vclk_freq *= 2;
 340
 341         venc_freq = vclk_freq;
 342         hdmi_freq = vclk_freq;
 343
 344         if (meson_venc_hdmi_venc_repeat(vic))
 345                 venc_freq *= 2;
 346
 347         vclk_freq = max(venc_freq, hdmi_freq);
 348
 349         if (mode->flags & DRM_MODE_FLAG_DBLCLK)
 350                 venc_freq /= 2;
 351
 352         DRM_DEBUG_DRIVER("vclk:%d venc=%d hdmi=%d enci=%d\n",
 353                 vclk_freq, venc_freq, hdmi_freq,
 354                 priv->venc.hdmi_use_enci);
 355
 356         meson_vclk_setup(priv, MESON_VCLK_TARGET_HDMI, vclk_freq,
 357                          venc_freq, hdmi_freq, priv->venc.hdmi_use_enci);
 358 }
 359
 360 static int dw_hdmi_phy_init(struct dw_hdmi *hdmi, void *data,
 361                             struct drm_display_mode *mode)
 362 {
 363         struct meson_dw_hdmi *dw_hdmi = (struct meson_dw_hdmi *)data;
 364         struct meson_drm *priv = dw_hdmi->priv;
 365         unsigned int wr_clk =
 366                 readl_relaxed(priv->io_base + _REG(VPU_HDMI_SETTING));
 367
 368         DRM_DEBUG_DRIVER("\"%s\" div%d\n", mode->name,
 369                          mode->clock > 340000 ? 40 : 10);
 370
 371         /* Enable clocks */
 372         regmap_update_bits(priv->hhi, HHI_HDMI_CLK_CNTL, 0xffff, 0x100);
 373
 374         /* Bring HDMITX MEM output of power down */
 375         regmap_update_bits(priv->hhi, HHI_MEM_PD_REG0, 0xff << 8, 0);
 376
 377         /* Bring out of reset */
 378         dw_hdmi_top_write(dw_hdmi, HDMITX_TOP_SW_RESET,  0);
 379
 380         /* Enable internal pixclk, tmds_clk, spdif_clk, i2s_clk, cecclk */
 381         dw_hdmi_top_write_bits(dw_hdmi, HDMITX_TOP_CLK_CNTL,
 382                                0x3, 0x3);
 383         dw_hdmi_top_write_bits(dw_hdmi, HDMITX_TOP_CLK_CNTL,
 384                                0x3 << 4, 0x3 << 4);
 385
 386         /* Enable normal output to PHY */
 387         dw_hdmi_top_write(dw_hdmi, HDMITX_TOP_BIST_CNTL, BIT(12));
 388
 389         /* TMDS pattern setup (TOFIX Handle the YUV420 case) */
 390         if (mode->clock > 340000) {
 391                 dw_hdmi_top_write(dw_hdmi, HDMITX_TOP_TMDS_CLK_PTTN_01, 0);
 392                 dw_hdmi_top_write(dw_hdmi, HDMITX_TOP_TMDS_CLK_PTTN_23,
 393                                   0x03ff03ff);
 394         } else {
 395                 dw_hdmi_top_write(dw_hdmi, HDMITX_TOP_TMDS_CLK_PTTN_01,
 396                                   0x001f001f);
 397                 dw_hdmi_top_write(dw_hdmi, HDMITX_TOP_TMDS_CLK_PTTN_23,
 398                                   0x001f001f);
 399         }
 400
 401         /* Load TMDS pattern */
 402         dw_hdmi_top_write(dw_hdmi, HDMITX_TOP_TMDS_CLK_PTTN_CNTL, 0x1);
 403         msleep(20);
 404         dw_hdmi_top_write(dw_hdmi, HDMITX_TOP_TMDS_CLK_PTTN_CNTL, 0x2);
 405
 406         /* Setup PHY parameters */
 407         meson_hdmi_phy_setup_mode(dw_hdmi, mode);
 408
 409         /* Setup PHY */
 410         regmap_update_bits(priv->hhi, HHI_HDMI_PHY_CNTL1,
 411                            0xffff << 16, 0x0390 << 16);
 412
 413         /* BIT_INVERT */
 414         if (dw_hdmi_is_compatible(dw_hdmi, "amlogic,meson-gxl-dw-hdmi") ||
 415             dw_hdmi_is_compatible(dw_hdmi, "amlogic,meson-gxm-dw-hdmi"))
 416                 regmap_update_bits(priv->hhi, HHI_HDMI_PHY_CNTL1,
 417                                    BIT(17), 0);
 418         else
 419                 regmap_update_bits(priv->hhi, HHI_HDMI_PHY_CNTL1,
 420                                    BIT(17), BIT(17));
 421
 422         /* Disable clock, fifo, fifo_wr */
 423         regmap_update_bits(priv->hhi, HHI_HDMI_PHY_CNTL1, 0xf, 0);
 424
 425         dw_hdmi_set_high_tmds_clock_ratio(hdmi);
 426
 427         msleep(100);
 428
 429         /* Reset PHY 3 times in a row */
 430         meson_dw_hdmi_phy_reset(dw_hdmi);
 431         meson_dw_hdmi_phy_reset(dw_hdmi);
 432         meson_dw_hdmi_phy_reset(dw_hdmi);
 433
 434         /* Temporary Disable VENC video stream */
 435         if (priv->venc.hdmi_use_enci)
 436                 writel_relaxed(0, priv->io_base + _REG(ENCI_VIDEO_EN));
 437         else
 438                 writel_relaxed(0, priv->io_base + _REG(ENCP_VIDEO_EN));
 439
 440         /* Temporary Disable HDMI video stream to HDMI-TX */
 441         writel_bits_relaxed(0x3, 0,
 442                             priv->io_base + _REG(VPU_HDMI_SETTING));
 443         writel_bits_relaxed(0xf << 8, 0,
 444                             priv->io_base + _REG(VPU_HDMI_SETTING));
 445
 446         /* Re-Enable VENC video stream */
 447         if (priv->venc.hdmi_use_enci)
 448                 writel_relaxed(1, priv->io_base + _REG(ENCI_VIDEO_EN));
 449         else
 450                 writel_relaxed(1, priv->io_base + _REG(ENCP_VIDEO_EN));
 451
 452         /* Push back HDMI clock settings */
 453         writel_bits_relaxed(0xf << 8, wr_clk & (0xf << 8),
 454                             priv->io_base + _REG(VPU_HDMI_SETTING));
 455
 456         /* Enable and Select HDMI video source for HDMI-TX */
 457         if (priv->venc.hdmi_use_enci)
 458                 writel_bits_relaxed(0x3, MESON_VENC_SOURCE_ENCI,
 459                                     priv->io_base + _REG(VPU_HDMI_SETTING));
 460         else
 461                 writel_bits_relaxed(0x3, MESON_VENC_SOURCE_ENCP,
 462                                     priv->io_base + _REG(VPU_HDMI_SETTING));
 463
 464         return 0;
 465 }
 466
 467 static void dw_hdmi_phy_disable(struct dw_hdmi *hdmi,
 468                                 void *data)
 469 {
 470         struct meson_dw_hdmi *dw_hdmi = (struct meson_dw_hdmi *)data;
 471         struct meson_drm *priv = dw_hdmi->priv;
 472
 473         DRM_DEBUG_DRIVER("\n");
 474
 475         regmap_write(priv->hhi, HHI_HDMI_PHY_CNTL0, 0);
 476 }
 477
 478 static enum drm_connector_status dw_hdmi_read_hpd(struct dw_hdmi *hdmi,
 479                              void *data)
 480 {
 481         struct meson_dw_hdmi *dw_hdmi = (struct meson_dw_hdmi *)data;
 482
 483         return !!dw_hdmi_top_read(dw_hdmi, HDMITX_TOP_STAT0) ?
 484                 connector_status_connected : connector_status_disconnected;
 485 }
 486
 487 static void dw_hdmi_setup_hpd(struct dw_hdmi *hdmi,
 488                               void *data)
 489 {
 490         struct meson_dw_hdmi *dw_hdmi = (struct meson_dw_hdmi *)data;
 491
 492         /* Setup HPD Filter */
 493         dw_hdmi_top_write(dw_hdmi, HDMITX_TOP_HPD_FILTER,
 494                           (0xa << 12) | 0xa0);
 495
 496         /* Clear interrupts */
 497         dw_hdmi_top_write(dw_hdmi, HDMITX_TOP_INTR_STAT_CLR,
 498                           HDMITX_TOP_INTR_HPD_RISE | HDMITX_TOP_INTR_HPD_FALL);
 499
 500         /* Unmask interrupts */
 501         dw_hdmi_top_write_bits(dw_hdmi, HDMITX_TOP_INTR_MASKN,
 502                         HDMITX_TOP_INTR_HPD_RISE | HDMITX_TOP_INTR_HPD_FALL,
 503                         HDMITX_TOP_INTR_HPD_RISE | HDMITX_TOP_INTR_HPD_FALL);
 504 }
 505
 506 static const struct dw_hdmi_phy_ops meson_dw_hdmi_phy_ops = {
 507         .init = dw_hdmi_phy_init,
 508         .disable = dw_hdmi_phy_disable,
 509         .read_hpd = dw_hdmi_read_hpd,
 510         .setup_hpd = dw_hdmi_setup_hpd,
 511 };
 512
 513 static irqreturn_t dw_hdmi_top_irq(int irq, void *dev_id)
 514 {
 515         struct meson_dw_hdmi *dw_hdmi = dev_id;
 516         u32 stat;
 517
 518         stat = dw_hdmi_top_read(dw_hdmi, HDMITX_TOP_INTR_STAT);
 519         dw_hdmi_top_write(dw_hdmi, HDMITX_TOP_INTR_STAT_CLR, stat);
 520
 521         /* HPD Events, handle in the threaded interrupt handler */
 522         if (stat & (HDMITX_TOP_INTR_HPD_RISE | HDMITX_TOP_INTR_HPD_FALL)) {
 523                 dw_hdmi->irq_stat = stat;
 524                 return IRQ_WAKE_THREAD;
 525         }
 526
 527         /* HDMI Controller Interrupt */
 528         if (stat & 1)
 529                 return IRQ_NONE;
 530
 531         /* TOFIX Handle HDCP Interrupts */
 532
 533         return IRQ_HANDLED;
 534 }
 535
 536 /* Threaded interrupt handler to manage HPD events */
 537 static irqreturn_t dw_hdmi_top_thread_irq(int irq, void *dev_id)
 538 {
 539         struct meson_dw_hdmi *dw_hdmi = dev_id;
 540         u32 stat = dw_hdmi->irq_stat;
 541
 542         /* HPD Events */
 543         if (stat & (HDMITX_TOP_INTR_HPD_RISE | HDMITX_TOP_INTR_HPD_FALL)) {
 544                 bool hpd_connected = false;
 545
 546                 if (stat & HDMITX_TOP_INTR_HPD_RISE)
 547                         hpd_connected = true;
 548
 549                 dw_hdmi_setup_rx_sense(dw_hdmi->hdmi, hpd_connected,
 550                                        hpd_connected);
 551
 552                 drm_helper_hpd_irq_event(dw_hdmi->encoder.dev);
 553         }
 554
 555         return IRQ_HANDLED;
 556 }
 557
 558 static enum drm_mode_status
 559 dw_hdmi_mode_valid(struct drm_connector *connector,
 560                    const struct drm_display_mode *mode)
 561 {
 562         struct meson_drm *priv = connector->dev->dev_private;
 563         unsigned int vclk_freq;
 564         unsigned int venc_freq;
 565         unsigned int hdmi_freq;
 566         int vic = drm_match_cea_mode(mode);
 567         enum drm_mode_status status;
 568
 569         DRM_DEBUG_DRIVER("Modeline " DRM_MODE_FMT "\n", DRM_MODE_ARG(mode));
 570
 571         /* If sink max TMDS clock, we reject the mode */
 572         if (mode->clock > connector->display_info.max_tmds_clock)
 573                 return MODE_BAD;
 574
 575         /* Check against non-VIC supported modes */
 576         if (!vic) {
 577                 status = meson_venc_hdmi_supported_mode(mode);
 578                 if (status != MODE_OK)
 579                         return status;
 580
 581                 return meson_vclk_dmt_supported_freq(priv, mode->clock);
 582         /* Check against supported VIC modes */
 583         } else if (!meson_venc_hdmi_supported_vic(vic))
 584                 return MODE_BAD;
 585
 586         vclk_freq = mode->clock;
 587
 588         /* 480i/576i needs global pixel doubling */
 589         if (mode->flags & DRM_MODE_FLAG_DBLCLK)
 590                 vclk_freq *= 2;
 591
 592         venc_freq = vclk_freq;
 593         hdmi_freq = vclk_freq;
 594
 595         /* VENC double pixels for 1080i and 720p modes */
 596         if (meson_venc_hdmi_venc_repeat(vic))
 597                 venc_freq *= 2;
 598
 599         vclk_freq = max(venc_freq, hdmi_freq);
 600
 601         if (mode->flags & DRM_MODE_FLAG_DBLCLK)
 602                 venc_freq /= 2;
 603
 604         dev_dbg(connector->dev->dev, "%s: vclk:%d venc=%d hdmi=%d\n", __func__,
 605                 vclk_freq, venc_freq, hdmi_freq);
 606
 607         return meson_vclk_vic_supported_freq(vclk_freq);
 608 }
 609
 610 /* Encoder */
 611
 612 static void meson_venc_hdmi_encoder_destroy(struct drm_encoder *encoder)
 613 {
 614         drm_encoder_cleanup(encoder);
 615 }
 616
 617 static const struct drm_encoder_funcs meson_venc_hdmi_encoder_funcs = {
 618         .destroy        = meson_venc_hdmi_encoder_destroy,
 619 };
 620
 621 static int meson_venc_hdmi_encoder_atomic_check(struct drm_encoder *encoder,
 622                                         struct drm_crtc_state *crtc_state,
 623                                         struct drm_connector_state *conn_state)
 624 {
 625         return 0;
 626 }
 627
 628 static void meson_venc_hdmi_encoder_disable(struct drm_encoder *encoder)
 629 {
 630         struct meson_dw_hdmi *dw_hdmi = encoder_to_meson_dw_hdmi(encoder);
 631         struct meson_drm *priv = dw_hdmi->priv;
 632
 633         DRM_DEBUG_DRIVER("\n");
 634
 635         writel_bits_relaxed(0x3, 0,
 636                             priv->io_base + _REG(VPU_HDMI_SETTING));
 637
 638         writel_relaxed(0, priv->io_base + _REG(ENCI_VIDEO_EN));
 639         writel_relaxed(0, priv->io_base + _REG(ENCP_VIDEO_EN));
 640 }
 641
 642 static void meson_venc_hdmi_encoder_enable(struct drm_encoder *encoder)
 643 {
 644         struct meson_dw_hdmi *dw_hdmi = encoder_to_meson_dw_hdmi(encoder);
 645         struct meson_drm *priv = dw_hdmi->priv;
 646
 647         DRM_DEBUG_DRIVER("%s\n", priv->venc.hdmi_use_enci ? "VENCI" : "VENCP");
 648
 649         if (priv->venc.hdmi_use_enci)
 650                 writel_relaxed(1, priv->io_base + _REG(ENCI_VIDEO_EN));
 651         else
 652                 writel_relaxed(1, priv->io_base + _REG(ENCP_VIDEO_EN));
 653 }
 654
 655 static void meson_venc_hdmi_encoder_mode_set(struct drm_encoder *encoder,
 656                                    struct drm_display_mode *mode,
 657                                    struct drm_display_mode *adjusted_mode)
 658 {
 659         struct meson_dw_hdmi *dw_hdmi = encoder_to_meson_dw_hdmi(encoder);
 660         struct meson_drm *priv = dw_hdmi->priv;
 661         int vic = drm_match_cea_mode(mode);
 662
 663         DRM_DEBUG_DRIVER("\"%s\" vic %d\n", mode->name, vic);
 664
 665         /* VENC + VENC-DVI Mode setup */
 666         meson_venc_hdmi_mode_set(priv, vic, mode);
 667
 668         /* VCLK Set clock */
 669         dw_hdmi_set_vclk(dw_hdmi, mode);
 670
 671         /* Setup YUV444 to HDMI-TX, no 10bit diphering */
 672         writel_relaxed(0, priv->io_base + _REG(VPU_HDMI_FMT_CTRL));
 673 }
 674
 675 static const struct drm_encoder_helper_funcs
 676                                 meson_venc_hdmi_encoder_helper_funcs = {
 677         .atomic_check   = meson_venc_hdmi_encoder_atomic_check,
 678         .disable        = meson_venc_hdmi_encoder_disable,
 679         .enable         = meson_venc_hdmi_encoder_enable,
 680         .mode_set       = meson_venc_hdmi_encoder_mode_set,
 681 };
 682
 683 /* DW HDMI Regmap */
 684
 685 static int meson_dw_hdmi_reg_read(void *context, unsigned int reg,
 686                                   unsigned int *result)
 687 {
 688         *result = dw_hdmi_dwc_read(context, reg);
 689
 690         return 0;
 691
 692 }
 693
 694 static int meson_dw_hdmi_reg_write(void *context, unsigned int reg,
 695                                    unsigned int val)
 696 {
 697         dw_hdmi_dwc_write(context, reg, val);
 698
 699         return 0;
 700 }
 701
 702 static const struct regmap_config meson_dw_hdmi_regmap_config = {
 703         .reg_bits = 32,
 704         .val_bits = 8,
 705         .reg_read = meson_dw_hdmi_reg_read,
 706         .reg_write = meson_dw_hdmi_reg_write,
 707         .max_register = 0x10000,
 708         .fast_io = true,
 709 };
 710
 711 static bool meson_hdmi_connector_is_available(struct device *dev)
 712 {
 713         struct device_node *ep, *remote;
 714
 715         /* HDMI Connector is on the second port, first endpoint */
 716         ep = of_graph_get_endpoint_by_regs(dev->of_node, 1, 0);
 717         if (!ep)
 718                 return false;
 719
 720         /* If the endpoint node exists, consider it enabled */
 721         remote = of_graph_get_remote_port(ep);
 722         if (remote) {
 723                 of_node_put(ep);
 724                 return true;
 725         }
 726
 727         of_node_put(ep);
 728         of_node_put(remote);
 729
 730         return false;
 731 }
 732
 733 static int meson_dw_hdmi_bind(struct device *dev, struct device *master,
 734                                 void *data)
 735 {
 736         struct platform_device *pdev = to_platform_device(dev);
 737         struct meson_dw_hdmi *meson_dw_hdmi;
 738         struct drm_device *drm = data;
 739         struct meson_drm *priv = drm->dev_private;
 740         struct dw_hdmi_plat_data *dw_plat_data;
 741         struct drm_encoder *encoder;
 742         struct resource *res;
 743         int irq;
 744         int ret;
 745
 746         DRM_DEBUG_DRIVER("\n");
 747
 748         if (!meson_hdmi_connector_is_available(dev)) {
 749                 dev_info(drm->dev, "HDMI Output connector not available\n");
 750                 return -ENODEV;
 751         }
 752
 753         meson_dw_hdmi = devm_kzalloc(dev, sizeof(*meson_dw_hdmi),
 754                                      GFP_KERNEL);
 755         if (!meson_dw_hdmi)
 756                 return -ENOMEM;
 757
 758         meson_dw_hdmi->priv = priv;
 759         meson_dw_hdmi->dev = dev;
 760         dw_plat_data = &meson_dw_hdmi->dw_plat_data;
 761         encoder = &meson_dw_hdmi->encoder;
 762
 763         meson_dw_hdmi->hdmi_supply = devm_regulator_get_optional(dev, "hdmi");
 764         if (IS_ERR(meson_dw_hdmi->hdmi_supply)) {
 765                 if (PTR_ERR(meson_dw_hdmi->hdmi_supply) == -EPROBE_DEFER)
 766                         return -EPROBE_DEFER;
 767                 meson_dw_hdmi->hdmi_supply = NULL;
 768         } else {
 769                 ret = regulator_enable(meson_dw_hdmi->hdmi_supply);
 770                 if (ret)
 771                         return ret;
 772         }
 773
 774         meson_dw_hdmi->hdmitx_apb = devm_reset_control_get_exclusive(dev,
 775                                                 "hdmitx_apb");
 776         if (IS_ERR(meson_dw_hdmi->hdmitx_apb)) {
 777                 dev_err(dev, "Failed to get hdmitx_apb reset\n");
 778                 return PTR_ERR(meson_dw_hdmi->hdmitx_apb);
 779         }
 780
 781         meson_dw_hdmi->hdmitx_ctrl = devm_reset_control_get_exclusive(dev,
 782                                                 "hdmitx");
 783         if (IS_ERR(meson_dw_hdmi->hdmitx_ctrl)) {
 784                 dev_err(dev, "Failed to get hdmitx reset\n");
 785                 return PTR_ERR(meson_dw_hdmi->hdmitx_ctrl);
 786         }
 787
 788         meson_dw_hdmi->hdmitx_phy = devm_reset_control_get_exclusive(dev,
 789                                                 "hdmitx_phy");
 790         if (IS_ERR(meson_dw_hdmi->hdmitx_phy)) {
 791                 dev_err(dev, "Failed to get hdmitx_phy reset\n");
 792                 return PTR_ERR(meson_dw_hdmi->hdmitx_phy);
 793         }
 794
 795         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 796         meson_dw_hdmi->hdmitx = devm_ioremap_resource(dev, res);
 797         if (IS_ERR(meson_dw_hdmi->hdmitx))
 798                 return PTR_ERR(meson_dw_hdmi->hdmitx);
 799
 800         meson_dw_hdmi->hdmi_pclk = devm_clk_get(dev, "isfr");
 801         if (IS_ERR(meson_dw_hdmi->hdmi_pclk)) {
 802                 dev_err(dev, "Unable to get HDMI pclk\n");
 803                 return PTR_ERR(meson_dw_hdmi->hdmi_pclk);
 804         }
 805         clk_prepare_enable(meson_dw_hdmi->hdmi_pclk);
 806
 807         meson_dw_hdmi->venci_clk = devm_clk_get(dev, "venci");
 808         if (IS_ERR(meson_dw_hdmi->venci_clk)) {
 809                 dev_err(dev, "Unable to get venci clk\n");
 810                 return PTR_ERR(meson_dw_hdmi->venci_clk);
 811         }
 812         clk_prepare_enable(meson_dw_hdmi->venci_clk);
 813
 814         dw_plat_data->regm = devm_regmap_init(dev, NULL, meson_dw_hdmi,
 815                                               &meson_dw_hdmi_regmap_config);
 816         if (IS_ERR(dw_plat_data->regm))
 817                 return PTR_ERR(dw_plat_data->regm);
 818
 819         irq = platform_get_irq(pdev, 0);
 820         if (irq < 0) {
 821                 dev_err(dev, "Failed to get hdmi top irq\n");
 822                 return irq;
 823         }
 824
 825         ret = devm_request_threaded_irq(dev, irq, dw_hdmi_top_irq,
 826                                         dw_hdmi_top_thread_irq, IRQF_SHARED,
 827                                         "dw_hdmi_top_irq", meson_dw_hdmi);
 828         if (ret) {
 829                 dev_err(dev, "Failed to request hdmi top irq\n");
 830                 return ret;
 831         }
 832
 833         /* Encoder */
 834
 835         drm_encoder_helper_add(encoder, &meson_venc_hdmi_encoder_helper_funcs);
 836
 837         ret = drm_encoder_init(drm, encoder, &meson_venc_hdmi_encoder_funcs,
 838                                DRM_MODE_ENCODER_TMDS, "meson_hdmi");
 839         if (ret) {
 840                 dev_err(priv->dev, "Failed to init HDMI encoder\n");
 841                 return ret;
 842         }
 843
 844         encoder->possible_crtcs = BIT(0);
 845
 846         DRM_DEBUG_DRIVER("encoder initialized\n");
 847
 848         /* Enable clocks */
 849         regmap_update_bits(priv->hhi, HHI_HDMI_CLK_CNTL, 0xffff, 0x100);
 850
 851         /* Bring HDMITX MEM output of power down */
 852         regmap_update_bits(priv->hhi, HHI_MEM_PD_REG0, 0xff << 8, 0);
 853
 854         /* Reset HDMITX APB & TX & PHY */
 855         reset_control_reset(meson_dw_hdmi->hdmitx_apb);
 856         reset_control_reset(meson_dw_hdmi->hdmitx_ctrl);
 857         reset_control_reset(meson_dw_hdmi->hdmitx_phy);
 858
 859         /* Enable APB3 fail on error */
 860         writel_bits_relaxed(BIT(15), BIT(15),
 861                             meson_dw_hdmi->hdmitx + HDMITX_TOP_CTRL_REG);
 862         writel_bits_relaxed(BIT(15), BIT(15),
 863                             meson_dw_hdmi->hdmitx + HDMITX_DWC_CTRL_REG);
 864
 865         /* Bring out of reset */
 866         dw_hdmi_top_write(meson_dw_hdmi, HDMITX_TOP_SW_RESET,  0);
 867
 868         msleep(20);
 869
 870         dw_hdmi_top_write(meson_dw_hdmi, HDMITX_TOP_CLK_CNTL, 0xff);
 871
 872         /* Enable HDMI-TX Interrupt */
 873         dw_hdmi_top_write(meson_dw_hdmi, HDMITX_TOP_INTR_STAT_CLR,
 874                           HDMITX_TOP_INTR_CORE);
 875
 876         dw_hdmi_top_write(meson_dw_hdmi, HDMITX_TOP_INTR_MASKN,
 877                           HDMITX_TOP_INTR_CORE);
 878
 879         /* Bridge / Connector */
 880
 881         dw_plat_data->mode_valid = dw_hdmi_mode_valid;
 882         dw_plat_data->phy_ops = &meson_dw_hdmi_phy_ops;
 883         dw_plat_data->phy_name = "meson_dw_hdmi_phy";
 884         dw_plat_data->phy_data = meson_dw_hdmi;
 885         dw_plat_data->input_bus_format = MEDIA_BUS_FMT_YUV8_1X24;
 886         dw_plat_data->input_bus_encoding = V4L2_YCBCR_ENC_709;
 887
 888         platform_set_drvdata(pdev, meson_dw_hdmi);
 889
 890         meson_dw_hdmi->hdmi = dw_hdmi_bind(pdev, encoder,
 891                                            &meson_dw_hdmi->dw_plat_data);
 892         if (IS_ERR(meson_dw_hdmi->hdmi))
 893                 return PTR_ERR(meson_dw_hdmi->hdmi);
 894
 895         DRM_DEBUG_DRIVER("HDMI controller initialized\n");
 896
 897         return 0;
 898 }
 899
 900 static void meson_dw_hdmi_unbind(struct device *dev, struct device *master,
 901                                    void *data)
 902 {
 903         struct meson_dw_hdmi *meson_dw_hdmi = dev_get_drvdata(dev);
 904
 905         dw_hdmi_unbind(meson_dw_hdmi->hdmi);
 906 }
 907
 908 static const struct component_ops meson_dw_hdmi_ops = {
 909         .bind   = meson_dw_hdmi_bind,
 910         .unbind = meson_dw_hdmi_unbind,
 911 };
 912
 913 static int meson_dw_hdmi_probe(struct platform_device *pdev)
 914 {
 915         return component_add(&pdev->dev, &meson_dw_hdmi_ops);
 916 }
 917
 918 static int meson_dw_hdmi_remove(struct platform_device *pdev)
 919 {
 920         component_del(&pdev->dev, &meson_dw_hdmi_ops);
 921
 922         return 0;
 923 }
 924
 925 static const struct of_device_id meson_dw_hdmi_of_table[] = {
 926         { .compatible = "amlogic,meson-gxbb-dw-hdmi" },
 927         { .compatible = "amlogic,meson-gxl-dw-hdmi" },
 928         { .compatible = "amlogic,meson-gxm-dw-hdmi" },
 929         { }
 930 };
 931 MODULE_DEVICE_TABLE(of, meson_dw_hdmi_of_table);
 932
 933 static struct platform_driver meson_dw_hdmi_platform_driver = {
 934         .probe          = meson_dw_hdmi_probe,
 935         .remove         = meson_dw_hdmi_remove,
 936         .driver         = {
 937                 .name           = DRIVER_NAME,
 938                 .of_match_table = meson_dw_hdmi_of_table,
 939         },
 940 };
 941 module_platform_driver(meson_dw_hdmi_platform_driver);
 942
 943 MODULE_AUTHOR("Neil Armstrong <narmstrong@baylibre.com>");
 944 MODULE_DESCRIPTION(DRIVER_DESC);
 945 MODULE_LICENSE("GPL");