drivers/gpu/drm/msm/hdmi/hdmi_connector.c

   1 /*
   2  * Copyright (C) 2013 Red Hat
   3  * Author: Rob Clark <robdclark@gmail.com>
   4  *
   5  * This program is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 as published by
   7  * the Free Software Foundation.
   8  *
   9  * This program is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  12  * more details.
  13  *
  14  * You should have received a copy of the GNU General Public License along with
  15  * this program.  If not, see <http://www.gnu.org/licenses/>.
  16  */
  17
  18 #include <linux/gpio.h>
  19 #include <linux/pinctrl/consumer.h>
  20
  21 #include "msm_kms.h"
  22 #include "hdmi.h"
  23
  24 struct hdmi_connector {
  25         struct drm_connector base;
  26         struct hdmi *hdmi;
  27         struct work_struct hpd_work;
  28 };
  29 #define to_hdmi_connector(x) container_of(x, struct hdmi_connector, base)
  30
  31 static void msm_hdmi_phy_reset(struct hdmi *hdmi)
  32 {
  33         unsigned int val;
  34
  35         val = hdmi_read(hdmi, REG_HDMI_PHY_CTRL);
  36
  37         if (val & HDMI_PHY_CTRL_SW_RESET_LOW) {
  38                 /* pull low */
  39                 hdmi_write(hdmi, REG_HDMI_PHY_CTRL,
  40                                 val & ~HDMI_PHY_CTRL_SW_RESET);
  41         } else {
  42                 /* pull high */
  43                 hdmi_write(hdmi, REG_HDMI_PHY_CTRL,
  44                                 val | HDMI_PHY_CTRL_SW_RESET);
  45         }
  46
  47         if (val & HDMI_PHY_CTRL_SW_RESET_PLL_LOW) {
  48                 /* pull low */
  49                 hdmi_write(hdmi, REG_HDMI_PHY_CTRL,
  50                                 val & ~HDMI_PHY_CTRL_SW_RESET_PLL);
  51         } else {
  52                 /* pull high */
  53                 hdmi_write(hdmi, REG_HDMI_PHY_CTRL,
  54                                 val | HDMI_PHY_CTRL_SW_RESET_PLL);
  55         }
  56
  57         msleep(100);
  58
  59         if (val & HDMI_PHY_CTRL_SW_RESET_LOW) {
  60                 /* pull high */
  61                 hdmi_write(hdmi, REG_HDMI_PHY_CTRL,
  62                                 val | HDMI_PHY_CTRL_SW_RESET);
  63         } else {
  64                 /* pull low */
  65                 hdmi_write(hdmi, REG_HDMI_PHY_CTRL,
  66                                 val & ~HDMI_PHY_CTRL_SW_RESET);
  67         }
  68
  69         if (val & HDMI_PHY_CTRL_SW_RESET_PLL_LOW) {
  70                 /* pull high */
  71                 hdmi_write(hdmi, REG_HDMI_PHY_CTRL,
  72                                 val | HDMI_PHY_CTRL_SW_RESET_PLL);
  73         } else {
  74                 /* pull low */
  75                 hdmi_write(hdmi, REG_HDMI_PHY_CTRL,
  76                                 val & ~HDMI_PHY_CTRL_SW_RESET_PLL);
  77         }
  78 }
  79
  80 static int gpio_config(struct hdmi *hdmi, bool on)
  81 {
  82         struct device *dev = &hdmi->pdev->dev;
  83         const struct hdmi_platform_config *config = hdmi->config;
  84         int ret, i;
  85
  86         if (on) {
  87                 for (i = 0; i < HDMI_MAX_NUM_GPIO; i++) {
  88                         struct hdmi_gpio_data gpio = config->gpios[i];
  89
  90                         if (gpio.num != -1) {
  91                                 ret = gpio_request(gpio.num, gpio.label);
  92                                 if (ret) {
  93                                         dev_err(dev,
  94                                                 "'%s'(%d) gpio_request failed: %d\n",
  95                                                 gpio.label, gpio.num, ret);
  96                                         goto err;
  97                                 }
  98
  99                                 if (gpio.output) {
 100                                         gpio_direction_output(gpio.num,
 101                                                               gpio.value);
 102                                 } else {
 103                                         gpio_direction_input(gpio.num);
 104                                         gpio_set_value_cansleep(gpio.num,
 105                                                                 gpio.value);
 106                                 }
 107                         }
 108                 }
 109
 110                 DBG("gpio on");
 111         } else {
 112                 for (i = 0; i < HDMI_MAX_NUM_GPIO; i++) {
 113                         struct hdmi_gpio_data gpio = config->gpios[i];
 114
 115                         if (gpio.num == -1)
 116                                 continue;
 117
 118                         if (gpio.output) {
 119                                 int value = gpio.value ? 0 : 1;
 120
 121                                 gpio_set_value_cansleep(gpio.num, value);
 122                         }
 123
 124                         gpio_free(gpio.num);
 125                 };
 126
 127                 DBG("gpio off");
 128         }
 129
 130         return 0;
 131 err:
 132         while (i--) {
 133                 if (config->gpios[i].num != -1)
 134                         gpio_free(config->gpios[i].num);
 135         }
 136
 137         return ret;
 138 }
 139
 140 static int hpd_enable(struct hdmi_connector *hdmi_connector)
 141 {
 142         struct hdmi *hdmi = hdmi_connector->hdmi;
 143         const struct hdmi_platform_config *config = hdmi->config;
 144         struct device *dev = &hdmi->pdev->dev;
 145         uint32_t hpd_ctrl;
 146         int i, ret;
 147         unsigned long flags;
 148
 149         for (i = 0; i < config->hpd_reg_cnt; i++) {
 150                 ret = regulator_enable(hdmi->hpd_regs[i]);
 151                 if (ret) {
 152                         dev_err(dev, "failed to enable hpd regulator: %s (%d)\n",
 153                                         config->hpd_reg_names[i], ret);
 154                         goto fail;
 155                 }
 156         }
 157
 158         ret = pinctrl_pm_select_default_state(dev);
 159         if (ret) {
 160                 dev_err(dev, "pinctrl state chg failed: %d\n", ret);
 161                 goto fail;
 162         }
 163
 164         ret = gpio_config(hdmi, true);
 165         if (ret) {
 166                 dev_err(dev, "failed to configure GPIOs: %d\n", ret);
 167                 goto fail;
 168         }
 169
 170         for (i = 0; i < config->hpd_clk_cnt; i++) {
 171                 if (config->hpd_freq && config->hpd_freq[i]) {
 172                         ret = clk_set_rate(hdmi->hpd_clks[i],
 173                                         config->hpd_freq[i]);
 174                         if (ret)
 175                                 dev_warn(dev, "failed to set clk %s (%d)\n",
 176                                                 config->hpd_clk_names[i], ret);
 177                 }
 178
 179                 ret = clk_prepare_enable(hdmi->hpd_clks[i]);
 180                 if (ret) {
 181                         dev_err(dev, "failed to enable hpd clk: %s (%d)\n",
 182                                         config->hpd_clk_names[i], ret);
 183                         goto fail;
 184                 }
 185         }
 186
 187         msm_hdmi_set_mode(hdmi, false);
 188         msm_hdmi_phy_reset(hdmi);
 189         msm_hdmi_set_mode(hdmi, true);
 190
 191         hdmi_write(hdmi, REG_HDMI_USEC_REFTIMER, 0x0001001b);
 192
 193         /* enable HPD events: */
 194         hdmi_write(hdmi, REG_HDMI_HPD_INT_CTRL,
 195                         HDMI_HPD_INT_CTRL_INT_CONNECT |
 196                         HDMI_HPD_INT_CTRL_INT_EN);
 197
 198         /* set timeout to 4.1ms (max) for hardware debounce */
 199         spin_lock_irqsave(&hdmi->reg_lock, flags);
 200         hpd_ctrl = hdmi_read(hdmi, REG_HDMI_HPD_CTRL);
 201         hpd_ctrl |= HDMI_HPD_CTRL_TIMEOUT(0x1fff);
 202
 203         /* Toggle HPD circuit to trigger HPD sense */
 204         hdmi_write(hdmi, REG_HDMI_HPD_CTRL,
 205                         ~HDMI_HPD_CTRL_ENABLE & hpd_ctrl);
 206         hdmi_write(hdmi, REG_HDMI_HPD_CTRL,
 207                         HDMI_HPD_CTRL_ENABLE | hpd_ctrl);
 208         spin_unlock_irqrestore(&hdmi->reg_lock, flags);
 209
 210         return 0;
 211
 212 fail:
 213         return ret;
 214 }
 215
 216 static void hdp_disable(struct hdmi_connector *hdmi_connector)
 217 {
 218         struct hdmi *hdmi = hdmi_connector->hdmi;
 219         const struct hdmi_platform_config *config = hdmi->config;
 220         struct device *dev = &hdmi->pdev->dev;
 221         int i, ret = 0;
 222
 223         /* Disable HPD interrupt */
 224         hdmi_write(hdmi, REG_HDMI_HPD_INT_CTRL, 0);
 225
 226         msm_hdmi_set_mode(hdmi, false);
 227
 228         for (i = 0; i < config->hpd_clk_cnt; i++)
 229                 clk_disable_unprepare(hdmi->hpd_clks[i]);
 230
 231         ret = gpio_config(hdmi, false);
 232         if (ret)
 233                 dev_warn(dev, "failed to unconfigure GPIOs: %d\n", ret);
 234
 235         ret = pinctrl_pm_select_sleep_state(dev);
 236         if (ret)
 237                 dev_warn(dev, "pinctrl state chg failed: %d\n", ret);
 238
 239         for (i = 0; i < config->hpd_reg_cnt; i++) {
 240                 ret = regulator_disable(hdmi->hpd_regs[i]);
 241                 if (ret)
 242                         dev_warn(dev, "failed to disable hpd regulator: %s (%d)\n",
 243                                         config->hpd_reg_names[i], ret);
 244         }
 245 }
 246
 247 static void
 248 msm_hdmi_hotplug_work(struct work_struct *work)
 249 {
 250         struct hdmi_connector *hdmi_connector =
 251                 container_of(work, struct hdmi_connector, hpd_work);
 252         struct drm_connector *connector = &hdmi_connector->base;
 253         drm_helper_hpd_irq_event(connector->dev);
 254 }
 255
 256 void msm_hdmi_connector_irq(struct drm_connector *connector)
 257 {
 258         struct hdmi_connector *hdmi_connector = to_hdmi_connector(connector);
 259         struct hdmi *hdmi = hdmi_connector->hdmi;
 260         uint32_t hpd_int_status, hpd_int_ctrl;
 261
 262         /* Process HPD: */
 263         hpd_int_status = hdmi_read(hdmi, REG_HDMI_HPD_INT_STATUS);
 264         hpd_int_ctrl   = hdmi_read(hdmi, REG_HDMI_HPD_INT_CTRL);
 265
 266         if ((hpd_int_ctrl & HDMI_HPD_INT_CTRL_INT_EN) &&
 267                         (hpd_int_status & HDMI_HPD_INT_STATUS_INT)) {
 268                 bool detected = !!(hpd_int_status & HDMI_HPD_INT_STATUS_CABLE_DETECTED);
 269
 270                 /* ack & disable (temporarily) HPD events: */
 271                 hdmi_write(hdmi, REG_HDMI_HPD_INT_CTRL,
 272                         HDMI_HPD_INT_CTRL_INT_ACK);
 273
 274                 DBG("status=%04x, ctrl=%04x", hpd_int_status, hpd_int_ctrl);
 275
 276                 /* detect disconnect if we are connected or visa versa: */
 277                 hpd_int_ctrl = HDMI_HPD_INT_CTRL_INT_EN;
 278                 if (!detected)
 279                         hpd_int_ctrl |= HDMI_HPD_INT_CTRL_INT_CONNECT;
 280                 hdmi_write(hdmi, REG_HDMI_HPD_INT_CTRL, hpd_int_ctrl);
 281
 282                 queue_work(hdmi->workq, &hdmi_connector->hpd_work);
 283         }
 284 }
 285
 286 static enum drm_connector_status detect_reg(struct hdmi *hdmi)
 287 {
 288         uint32_t hpd_int_status = hdmi_read(hdmi, REG_HDMI_HPD_INT_STATUS);
 289         return (hpd_int_status & HDMI_HPD_INT_STATUS_CABLE_DETECTED) ?
 290                         connector_status_connected : connector_status_disconnected;
 291 }
 292
 293 #define HPD_GPIO_INDEX  2
 294 static enum drm_connector_status detect_gpio(struct hdmi *hdmi)
 295 {
 296         const struct hdmi_platform_config *config = hdmi->config;
 297         struct hdmi_gpio_data hpd_gpio = config->gpios[HPD_GPIO_INDEX];
 298
 299         return gpio_get_value(hpd_gpio.num) ?
 300                         connector_status_connected :
 301                         connector_status_disconnected;
 302 }
 303
 304 static enum drm_connector_status hdmi_connector_detect(
 305                 struct drm_connector *connector, bool force)
 306 {
 307         struct hdmi_connector *hdmi_connector = to_hdmi_connector(connector);
 308         struct hdmi *hdmi = hdmi_connector->hdmi;
 309         const struct hdmi_platform_config *config = hdmi->config;
 310         struct hdmi_gpio_data hpd_gpio = config->gpios[HPD_GPIO_INDEX];
 311         enum drm_connector_status stat_gpio, stat_reg;
 312         int retry = 20;
 313
 314         /*
 315          * some platforms may not have hpd gpio. Rely only on the status
 316          * provided by REG_HDMI_HPD_INT_STATUS in this case.
 317          */
 318         if (hpd_gpio.num == -1)
 319                 return detect_reg(hdmi);
 320
 321         do {
 322                 stat_gpio = detect_gpio(hdmi);
 323                 stat_reg  = detect_reg(hdmi);
 324
 325                 if (stat_gpio == stat_reg)
 326                         break;
 327
 328                 mdelay(10);
 329         } while (--retry);
 330
 331         /* the status we get from reading gpio seems to be more reliable,
 332          * so trust that one the most if we didn't manage to get hdmi and
 333          * gpio status to agree:
 334          */
 335         if (stat_gpio != stat_reg) {
 336                 DBG("HDMI_HPD_INT_STATUS tells us: %d", stat_reg);
 337                 DBG("hpd gpio tells us: %d", stat_gpio);
 338         }
 339
 340         return stat_gpio;
 341 }
 342
 343 static void hdmi_connector_destroy(struct drm_connector *connector)
 344 {
 345         struct hdmi_connector *hdmi_connector = to_hdmi_connector(connector);
 346
 347         hdp_disable(hdmi_connector);
 348
 349         drm_connector_cleanup(connector);
 350
 351         kfree(hdmi_connector);
 352 }
 353
 354 static int msm_hdmi_connector_get_modes(struct drm_connector *connector)
 355 {
 356         struct hdmi_connector *hdmi_connector = to_hdmi_connector(connector);
 357         struct hdmi *hdmi = hdmi_connector->hdmi;
 358         struct edid *edid;
 359         uint32_t hdmi_ctrl;
 360         int ret = 0;
 361
 362         hdmi_ctrl = hdmi_read(hdmi, REG_HDMI_CTRL);
 363         hdmi_write(hdmi, REG_HDMI_CTRL, hdmi_ctrl | HDMI_CTRL_ENABLE);
 364
 365         edid = drm_get_edid(connector, hdmi->i2c);
 366
 367         hdmi_write(hdmi, REG_HDMI_CTRL, hdmi_ctrl);
 368
 369         hdmi->hdmi_mode = drm_detect_hdmi_monitor(edid);
 370         drm_mode_connector_update_edid_property(connector, edid);
 371
 372         if (edid) {
 373                 ret = drm_add_edid_modes(connector, edid);
 374                 kfree(edid);
 375         }
 376
 377         return ret;
 378 }
 379
 380 static int msm_hdmi_connector_mode_valid(struct drm_connector *connector,
 381                                  struct drm_display_mode *mode)
 382 {
 383         struct hdmi_connector *hdmi_connector = to_hdmi_connector(connector);
 384         struct hdmi *hdmi = hdmi_connector->hdmi;
 385         const struct hdmi_platform_config *config = hdmi->config;
 386         struct msm_drm_private *priv = connector->dev->dev_private;
 387         struct msm_kms *kms = priv->kms;
 388         long actual, requested;
 389
 390         requested = 1000 * mode->clock;
 391         actual = kms->funcs->round_pixclk(kms,
 392                         requested, hdmi_connector->hdmi->encoder);
 393
 394         /* for mdp5/apq8074, we manage our own pixel clk (as opposed to
 395          * mdp4/dtv stuff where pixel clk is assigned to mdp/encoder
 396          * instead):
 397          */
 398         if (config->pwr_clk_cnt > 0)
 399                 actual = clk_round_rate(hdmi->pwr_clks[0], actual);
 400
 401         DBG("requested=%ld, actual=%ld", requested, actual);
 402
 403         if (actual != requested)
 404                 return MODE_CLOCK_RANGE;
 405
 406         return 0;
 407 }
 408
 409 static const struct drm_connector_funcs hdmi_connector_funcs = {
 410         .dpms = drm_atomic_helper_connector_dpms,
 411         .detect = hdmi_connector_detect,
 412         .fill_modes = drm_helper_probe_single_connector_modes,
 413         .destroy = hdmi_connector_destroy,
 414         .reset = drm_atomic_helper_connector_reset,
 415         .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
 416         .atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
 417 };
 418
 419 static const struct drm_connector_helper_funcs msm_hdmi_connector_helper_funcs = {
 420         .get_modes = msm_hdmi_connector_get_modes,
 421         .mode_valid = msm_hdmi_connector_mode_valid,
 422 };
 423
 424 /* initialize connector */
 425 struct drm_connector *msm_hdmi_connector_init(struct hdmi *hdmi)
 426 {
 427         struct drm_connector *connector = NULL;
 428         struct hdmi_connector *hdmi_connector;
 429         int ret;
 430
 431         hdmi_connector = kzalloc(sizeof(*hdmi_connector), GFP_KERNEL);
 432         if (!hdmi_connector)
 433                 return ERR_PTR(-ENOMEM);
 434
 435         hdmi_connector->hdmi = hdmi;
 436         INIT_WORK(&hdmi_connector->hpd_work, msm_hdmi_hotplug_work);
 437
 438         connector = &hdmi_connector->base;
 439
 440         drm_connector_init(hdmi->dev, connector, &hdmi_connector_funcs,
 441                         DRM_MODE_CONNECTOR_HDMIA);
 442         drm_connector_helper_add(connector, &msm_hdmi_connector_helper_funcs);
 443
 444         connector->polled = DRM_CONNECTOR_POLL_CONNECT |
 445                         DRM_CONNECTOR_POLL_DISCONNECT;
 446
 447         connector->interlace_allowed = 0;
 448         connector->doublescan_allowed = 0;
 449
 450         ret = hpd_enable(hdmi_connector);
 451         if (ret) {
 452                 dev_err(&hdmi->pdev->dev, "failed to enable HPD: %d\n", ret);
 453                 return ERR_PTR(ret);
 454         }
 455
 456         drm_mode_connector_attach_encoder(connector, hdmi->encoder);
 457
 458         return connector;
 459 }