drivers/gpu/drm/sun4i/sun4i_hdmi_enc.c

   1 /*
   2  * Copyright (C) 2016 Maxime Ripard
   3  *
   4  * Maxime Ripard <maxime.ripard@free-electrons.com>
   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
   9  * the License, or (at your option) any later version.
  10  */
  11
  12 #include <drm/drmP.h>
  13 #include <drm/drm_atomic_helper.h>
  14 #include <drm/drm_crtc_helper.h>
  15 #include <drm/drm_edid.h>
  16 #include <drm/drm_encoder.h>
  17 #include <drm/drm_of.h>
  18 #include <drm/drm_panel.h>
  19
  20 #include <linux/clk.h>
  21 #include <linux/component.h>
  22 #include <linux/iopoll.h>
  23 #include <linux/platform_device.h>
  24 #include <linux/pm_runtime.h>
  25
  26 #include "sun4i_backend.h"
  27 #include "sun4i_crtc.h"
  28 #include "sun4i_drv.h"
  29 #include "sun4i_hdmi.h"
  30 #include "sun4i_tcon.h"
  31
  32 static inline struct sun4i_hdmi *
  33 drm_encoder_to_sun4i_hdmi(struct drm_encoder *encoder)
  34 {
  35         return container_of(encoder, struct sun4i_hdmi,
  36                             encoder);
  37 }
  38
  39 static inline struct sun4i_hdmi *
  40 drm_connector_to_sun4i_hdmi(struct drm_connector *connector)
  41 {
  42         return container_of(connector, struct sun4i_hdmi,
  43                             connector);
  44 }
  45
  46 static int sun4i_hdmi_setup_avi_infoframes(struct sun4i_hdmi *hdmi,
  47                                            struct drm_display_mode *mode)
  48 {
  49         struct hdmi_avi_infoframe frame;
  50         u8 buffer[17];
  51         int i, ret;
  52
  53         ret = drm_hdmi_avi_infoframe_from_display_mode(&frame, mode, false);
  54         if (ret < 0) {
  55                 DRM_ERROR("Failed to get infoframes from mode\n");
  56                 return ret;
  57         }
  58
  59         ret = hdmi_avi_infoframe_pack(&frame, buffer, sizeof(buffer));
  60         if (ret < 0) {
  61                 DRM_ERROR("Failed to pack infoframes\n");
  62                 return ret;
  63         }
  64
  65         for (i = 0; i < sizeof(buffer); i++)
  66                 writeb(buffer[i], hdmi->base + SUN4I_HDMI_AVI_INFOFRAME_REG(i));
  67
  68         return 0;
  69 }
  70
  71 static int sun4i_hdmi_atomic_check(struct drm_encoder *encoder,
  72                                    struct drm_crtc_state *crtc_state,
  73                                    struct drm_connector_state *conn_state)
  74 {
  75         struct drm_display_mode *mode = &crtc_state->mode;
  76
  77         if (mode->flags & DRM_MODE_FLAG_DBLCLK)
  78                 return -EINVAL;
  79
  80         return 0;
  81 }
  82
  83 static void sun4i_hdmi_disable(struct drm_encoder *encoder)
  84 {
  85         struct sun4i_hdmi *hdmi = drm_encoder_to_sun4i_hdmi(encoder);
  86         struct sun4i_crtc *crtc = drm_crtc_to_sun4i_crtc(encoder->crtc);
  87         struct sun4i_tcon *tcon = crtc->tcon;
  88         u32 val;
  89
  90         DRM_DEBUG_DRIVER("Disabling the HDMI Output\n");
  91
  92         val = readl(hdmi->base + SUN4I_HDMI_VID_CTRL_REG);
  93         val &= ~SUN4I_HDMI_VID_CTRL_ENABLE;
  94         writel(val, hdmi->base + SUN4I_HDMI_VID_CTRL_REG);
  95
  96         sun4i_tcon_channel_disable(tcon, 1);
  97 }
  98
  99 static void sun4i_hdmi_enable(struct drm_encoder *encoder)
 100 {
 101         struct drm_display_mode *mode = &encoder->crtc->state->adjusted_mode;
 102         struct sun4i_hdmi *hdmi = drm_encoder_to_sun4i_hdmi(encoder);
 103         struct sun4i_crtc *crtc = drm_crtc_to_sun4i_crtc(encoder->crtc);
 104         struct sun4i_tcon *tcon = crtc->tcon;
 105         u32 val = 0;
 106
 107         DRM_DEBUG_DRIVER("Enabling the HDMI Output\n");
 108
 109         sun4i_tcon_channel_enable(tcon, 1);
 110
 111         sun4i_hdmi_setup_avi_infoframes(hdmi, mode);
 112         val |= SUN4I_HDMI_PKT_CTRL_TYPE(0, SUN4I_HDMI_PKT_AVI);
 113         val |= SUN4I_HDMI_PKT_CTRL_TYPE(1, SUN4I_HDMI_PKT_END);
 114         writel(val, hdmi->base + SUN4I_HDMI_PKT_CTRL_REG(0));
 115
 116         val = SUN4I_HDMI_VID_CTRL_ENABLE;
 117         if (hdmi->hdmi_monitor)
 118                 val |= SUN4I_HDMI_VID_CTRL_HDMI_MODE;
 119
 120         writel(val, hdmi->base + SUN4I_HDMI_VID_CTRL_REG);
 121 }
 122
 123 static void sun4i_hdmi_mode_set(struct drm_encoder *encoder,
 124                                 struct drm_display_mode *mode,
 125                                 struct drm_display_mode *adjusted_mode)
 126 {
 127         struct sun4i_hdmi *hdmi = drm_encoder_to_sun4i_hdmi(encoder);
 128         struct sun4i_crtc *crtc = drm_crtc_to_sun4i_crtc(encoder->crtc);
 129         struct sun4i_tcon *tcon = crtc->tcon;
 130         unsigned int x, y;
 131         u32 val;
 132
 133         sun4i_tcon1_mode_set(tcon, mode);
 134         sun4i_tcon_set_mux(tcon, 1, encoder);
 135
 136         clk_set_rate(tcon->sclk1, mode->crtc_clock * 1000);
 137         clk_set_rate(hdmi->mod_clk, mode->crtc_clock * 1000);
 138         clk_set_rate(hdmi->tmds_clk, mode->crtc_clock * 1000);
 139
 140         /* Set input sync enable */
 141         writel(SUN4I_HDMI_UNKNOWN_INPUT_SYNC,
 142                hdmi->base + SUN4I_HDMI_UNKNOWN_REG);
 143
 144         /* Setup timing registers */
 145         writel(SUN4I_HDMI_VID_TIMING_X(mode->hdisplay) |
 146                SUN4I_HDMI_VID_TIMING_Y(mode->vdisplay),
 147                hdmi->base + SUN4I_HDMI_VID_TIMING_ACT_REG);
 148
 149         x = mode->htotal - mode->hsync_start;
 150         y = mode->vtotal - mode->vsync_start;
 151         writel(SUN4I_HDMI_VID_TIMING_X(x) | SUN4I_HDMI_VID_TIMING_Y(y),
 152                hdmi->base + SUN4I_HDMI_VID_TIMING_BP_REG);
 153
 154         x = mode->hsync_start - mode->hdisplay;
 155         y = mode->vsync_start - mode->vdisplay;
 156         writel(SUN4I_HDMI_VID_TIMING_X(x) | SUN4I_HDMI_VID_TIMING_Y(y),
 157                hdmi->base + SUN4I_HDMI_VID_TIMING_FP_REG);
 158
 159         x = mode->hsync_end - mode->hsync_start;
 160         y = mode->vsync_end - mode->vsync_start;
 161         writel(SUN4I_HDMI_VID_TIMING_X(x) | SUN4I_HDMI_VID_TIMING_Y(y),
 162                hdmi->base + SUN4I_HDMI_VID_TIMING_SPW_REG);
 163
 164         val = SUN4I_HDMI_VID_TIMING_POL_TX_CLK;
 165         if (mode->flags & DRM_MODE_FLAG_PHSYNC)
 166                 val |= SUN4I_HDMI_VID_TIMING_POL_HSYNC;
 167
 168         if (mode->flags & DRM_MODE_FLAG_PVSYNC)
 169                 val |= SUN4I_HDMI_VID_TIMING_POL_VSYNC;
 170
 171         writel(val, hdmi->base + SUN4I_HDMI_VID_TIMING_POL_REG);
 172 }
 173
 174 static const struct drm_encoder_helper_funcs sun4i_hdmi_helper_funcs = {
 175         .atomic_check   = sun4i_hdmi_atomic_check,
 176         .disable        = sun4i_hdmi_disable,
 177         .enable         = sun4i_hdmi_enable,
 178         .mode_set       = sun4i_hdmi_mode_set,
 179 };
 180
 181 static const struct drm_encoder_funcs sun4i_hdmi_funcs = {
 182         .destroy        = drm_encoder_cleanup,
 183 };
 184
 185 static int sun4i_hdmi_get_modes(struct drm_connector *connector)
 186 {
 187         struct sun4i_hdmi *hdmi = drm_connector_to_sun4i_hdmi(connector);
 188         struct edid *edid;
 189         int ret;
 190
 191         edid = drm_get_edid(connector, hdmi->i2c);
 192         if (!edid)
 193                 return 0;
 194
 195         hdmi->hdmi_monitor = drm_detect_hdmi_monitor(edid);
 196         DRM_DEBUG_DRIVER("Monitor is %s monitor\n",
 197                          hdmi->hdmi_monitor ? "an HDMI" : "a DVI");
 198
 199         drm_mode_connector_update_edid_property(connector, edid);
 200         cec_s_phys_addr_from_edid(hdmi->cec_adap, edid);
 201         ret = drm_add_edid_modes(connector, edid);
 202         kfree(edid);
 203
 204         return ret;
 205 }
 206
 207 static const struct drm_connector_helper_funcs sun4i_hdmi_connector_helper_funcs = {
 208         .get_modes      = sun4i_hdmi_get_modes,
 209 };
 210
 211 static enum drm_connector_status
 212 sun4i_hdmi_connector_detect(struct drm_connector *connector, bool force)
 213 {
 214         struct sun4i_hdmi *hdmi = drm_connector_to_sun4i_hdmi(connector);
 215         unsigned long reg;
 216
 217         if (readl_poll_timeout(hdmi->base + SUN4I_HDMI_HPD_REG, reg,
 218                                reg & SUN4I_HDMI_HPD_HIGH,
 219                                0, 500000)) {
 220                 cec_phys_addr_invalidate(hdmi->cec_adap);
 221                 return connector_status_disconnected;
 222         }
 223
 224         return connector_status_connected;
 225 }
 226
 227 static const struct drm_connector_funcs sun4i_hdmi_connector_funcs = {
 228         .detect                 = sun4i_hdmi_connector_detect,
 229         .fill_modes             = drm_helper_probe_single_connector_modes,
 230         .destroy                = drm_connector_cleanup,
 231         .reset                  = drm_atomic_helper_connector_reset,
 232         .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
 233         .atomic_destroy_state   = drm_atomic_helper_connector_destroy_state,
 234 };
 235
 236 #ifdef CONFIG_DRM_SUN4I_HDMI_CEC
 237 static bool sun4i_hdmi_cec_pin_read(struct cec_adapter *adap)
 238 {
 239         struct sun4i_hdmi *hdmi = cec_get_drvdata(adap);
 240
 241         return readl(hdmi->base + SUN4I_HDMI_CEC) & SUN4I_HDMI_CEC_RX;
 242 }
 243
 244 static void sun4i_hdmi_cec_pin_low(struct cec_adapter *adap)
 245 {
 246         struct sun4i_hdmi *hdmi = cec_get_drvdata(adap);
 247
 248         /* Start driving the CEC pin low */
 249         writel(SUN4I_HDMI_CEC_ENABLE, hdmi->base + SUN4I_HDMI_CEC);
 250 }
 251
 252 static void sun4i_hdmi_cec_pin_high(struct cec_adapter *adap)
 253 {
 254         struct sun4i_hdmi *hdmi = cec_get_drvdata(adap);
 255
 256         /*
 257          * Stop driving the CEC pin, the pull up will take over
 258          * unless another CEC device is driving the pin low.
 259          */
 260         writel(0, hdmi->base + SUN4I_HDMI_CEC);
 261 }
 262
 263 static const struct cec_pin_ops sun4i_hdmi_cec_pin_ops = {
 264         .read = sun4i_hdmi_cec_pin_read,
 265         .low = sun4i_hdmi_cec_pin_low,
 266         .high = sun4i_hdmi_cec_pin_high,
 267 };
 268 #endif
 269
 270 static int sun4i_hdmi_bind(struct device *dev, struct device *master,
 271                            void *data)
 272 {
 273         struct platform_device *pdev = to_platform_device(dev);
 274         struct drm_device *drm = data;
 275         struct sun4i_drv *drv = drm->dev_private;
 276         struct sun4i_hdmi *hdmi;
 277         struct resource *res;
 278         u32 reg;
 279         int ret;
 280
 281         hdmi = devm_kzalloc(dev, sizeof(*hdmi), GFP_KERNEL);
 282         if (!hdmi)
 283                 return -ENOMEM;
 284         dev_set_drvdata(dev, hdmi);
 285         hdmi->dev = dev;
 286         hdmi->drv = drv;
 287
 288         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 289         hdmi->base = devm_ioremap_resource(dev, res);
 290         if (IS_ERR(hdmi->base)) {
 291                 dev_err(dev, "Couldn't map the HDMI encoder registers\n");
 292                 return PTR_ERR(hdmi->base);
 293         }
 294
 295         hdmi->bus_clk = devm_clk_get(dev, "ahb");
 296         if (IS_ERR(hdmi->bus_clk)) {
 297                 dev_err(dev, "Couldn't get the HDMI bus clock\n");
 298                 return PTR_ERR(hdmi->bus_clk);
 299         }
 300         clk_prepare_enable(hdmi->bus_clk);
 301
 302         hdmi->mod_clk = devm_clk_get(dev, "mod");
 303         if (IS_ERR(hdmi->mod_clk)) {
 304                 dev_err(dev, "Couldn't get the HDMI mod clock\n");
 305                 return PTR_ERR(hdmi->mod_clk);
 306         }
 307         clk_prepare_enable(hdmi->mod_clk);
 308
 309         hdmi->pll0_clk = devm_clk_get(dev, "pll-0");
 310         if (IS_ERR(hdmi->pll0_clk)) {
 311                 dev_err(dev, "Couldn't get the HDMI PLL 0 clock\n");
 312                 return PTR_ERR(hdmi->pll0_clk);
 313         }
 314
 315         hdmi->pll1_clk = devm_clk_get(dev, "pll-1");
 316         if (IS_ERR(hdmi->pll1_clk)) {
 317                 dev_err(dev, "Couldn't get the HDMI PLL 1 clock\n");
 318                 return PTR_ERR(hdmi->pll1_clk);
 319         }
 320
 321         ret = sun4i_tmds_create(hdmi);
 322         if (ret) {
 323                 dev_err(dev, "Couldn't create the TMDS clock\n");
 324                 return ret;
 325         }
 326
 327         writel(SUN4I_HDMI_CTRL_ENABLE, hdmi->base + SUN4I_HDMI_CTRL_REG);
 328
 329         writel(SUN4I_HDMI_PAD_CTRL0_TXEN | SUN4I_HDMI_PAD_CTRL0_CKEN |
 330                SUN4I_HDMI_PAD_CTRL0_PWENG | SUN4I_HDMI_PAD_CTRL0_PWEND |
 331                SUN4I_HDMI_PAD_CTRL0_PWENC | SUN4I_HDMI_PAD_CTRL0_LDODEN |
 332                SUN4I_HDMI_PAD_CTRL0_LDOCEN | SUN4I_HDMI_PAD_CTRL0_BIASEN,
 333                hdmi->base + SUN4I_HDMI_PAD_CTRL0_REG);
 334
 335         /*
 336          * We can't just initialize the register there, we need to
 337          * protect the clock bits that have already been read out and
 338          * cached by the clock framework.
 339          */
 340         reg = readl(hdmi->base + SUN4I_HDMI_PAD_CTRL1_REG);
 341         reg &= SUN4I_HDMI_PAD_CTRL1_HALVE_CLK;
 342         reg |= SUN4I_HDMI_PAD_CTRL1_REG_AMP(6) |
 343                 SUN4I_HDMI_PAD_CTRL1_REG_EMP(2) |
 344                 SUN4I_HDMI_PAD_CTRL1_REG_DENCK |
 345                 SUN4I_HDMI_PAD_CTRL1_REG_DEN |
 346                 SUN4I_HDMI_PAD_CTRL1_EMPCK_OPT |
 347                 SUN4I_HDMI_PAD_CTRL1_EMP_OPT |
 348                 SUN4I_HDMI_PAD_CTRL1_AMPCK_OPT |
 349                 SUN4I_HDMI_PAD_CTRL1_AMP_OPT;
 350         writel(reg, hdmi->base + SUN4I_HDMI_PAD_CTRL1_REG);
 351
 352         reg = readl(hdmi->base + SUN4I_HDMI_PLL_CTRL_REG);
 353         reg &= SUN4I_HDMI_PLL_CTRL_DIV_MASK;
 354         reg |= SUN4I_HDMI_PLL_CTRL_VCO_S(8) | SUN4I_HDMI_PLL_CTRL_CS(7) |
 355                 SUN4I_HDMI_PLL_CTRL_CP_S(15) | SUN4I_HDMI_PLL_CTRL_S(7) |
 356                 SUN4I_HDMI_PLL_CTRL_VCO_GAIN(4) | SUN4I_HDMI_PLL_CTRL_SDIV2 |
 357                 SUN4I_HDMI_PLL_CTRL_LDO2_EN | SUN4I_HDMI_PLL_CTRL_LDO1_EN |
 358                 SUN4I_HDMI_PLL_CTRL_HV_IS_33 | SUN4I_HDMI_PLL_CTRL_BWS |
 359                 SUN4I_HDMI_PLL_CTRL_PLL_EN;
 360         writel(reg, hdmi->base + SUN4I_HDMI_PLL_CTRL_REG);
 361
 362         ret = sun4i_hdmi_i2c_create(dev, hdmi);
 363         if (ret) {
 364                 dev_err(dev, "Couldn't create the HDMI I2C adapter\n");
 365                 return ret;
 366         }
 367
 368         drm_encoder_helper_add(&hdmi->encoder,
 369                                &sun4i_hdmi_helper_funcs);
 370         ret = drm_encoder_init(drm,
 371                                &hdmi->encoder,
 372                                &sun4i_hdmi_funcs,
 373                                DRM_MODE_ENCODER_TMDS,
 374                                NULL);
 375         if (ret) {
 376                 dev_err(dev, "Couldn't initialise the HDMI encoder\n");
 377                 goto err_del_i2c_adapter;
 378         }
 379
 380         hdmi->encoder.possible_crtcs = drm_of_find_possible_crtcs(drm,
 381                                                                   dev->of_node);
 382         if (!hdmi->encoder.possible_crtcs) {
 383                 ret = -EPROBE_DEFER;
 384                 goto err_del_i2c_adapter;
 385         }
 386
 387 #ifdef CONFIG_DRM_SUN4I_HDMI_CEC
 388         hdmi->cec_adap = cec_pin_allocate_adapter(&sun4i_hdmi_cec_pin_ops,
 389                 hdmi, "sun4i", CEC_CAP_TRANSMIT | CEC_CAP_LOG_ADDRS |
 390                 CEC_CAP_PASSTHROUGH | CEC_CAP_RC);
 391         ret = PTR_ERR_OR_ZERO(hdmi->cec_adap);
 392         if (ret < 0)
 393                 goto err_cleanup_connector;
 394         writel(readl(hdmi->base + SUN4I_HDMI_CEC) & ~SUN4I_HDMI_CEC_TX,
 395                hdmi->base + SUN4I_HDMI_CEC);
 396 #endif
 397
 398         drm_connector_helper_add(&hdmi->connector,
 399                                  &sun4i_hdmi_connector_helper_funcs);
 400         ret = drm_connector_init(drm, &hdmi->connector,
 401                                  &sun4i_hdmi_connector_funcs,
 402                                  DRM_MODE_CONNECTOR_HDMIA);
 403         if (ret) {
 404                 dev_err(dev,
 405                         "Couldn't initialise the HDMI connector\n");
 406                 goto err_cleanup_connector;
 407         }
 408
 409         /* There is no HPD interrupt, so we need to poll the controller */
 410         hdmi->connector.polled = DRM_CONNECTOR_POLL_CONNECT |
 411                 DRM_CONNECTOR_POLL_DISCONNECT;
 412
 413         ret = cec_register_adapter(hdmi->cec_adap, dev);
 414         if (ret < 0)
 415                 goto err_cleanup_connector;
 416         drm_mode_connector_attach_encoder(&hdmi->connector, &hdmi->encoder);
 417
 418         return 0;
 419
 420 err_cleanup_connector:
 421         cec_delete_adapter(hdmi->cec_adap);
 422         drm_encoder_cleanup(&hdmi->encoder);
 423 err_del_i2c_adapter:
 424         i2c_del_adapter(hdmi->i2c);
 425         return ret;
 426 }
 427
 428 static void sun4i_hdmi_unbind(struct device *dev, struct device *master,
 429                             void *data)
 430 {
 431         struct sun4i_hdmi *hdmi = dev_get_drvdata(dev);
 432
 433         cec_unregister_adapter(hdmi->cec_adap);
 434         drm_connector_cleanup(&hdmi->connector);
 435         drm_encoder_cleanup(&hdmi->encoder);
 436         i2c_del_adapter(hdmi->i2c);
 437 }
 438
 439 static const struct component_ops sun4i_hdmi_ops = {
 440         .bind   = sun4i_hdmi_bind,
 441         .unbind = sun4i_hdmi_unbind,
 442 };
 443
 444 static int sun4i_hdmi_probe(struct platform_device *pdev)
 445 {
 446         return component_add(&pdev->dev, &sun4i_hdmi_ops);
 447 }
 448
 449 static int sun4i_hdmi_remove(struct platform_device *pdev)
 450 {
 451         component_del(&pdev->dev, &sun4i_hdmi_ops);
 452
 453         return 0;
 454 }
 455
 456 static const struct of_device_id sun4i_hdmi_of_table[] = {
 457         { .compatible = "allwinner,sun5i-a10s-hdmi" },
 458         { }
 459 };
 460 MODULE_DEVICE_TABLE(of, sun4i_hdmi_of_table);
 461
 462 static struct platform_driver sun4i_hdmi_driver = {
 463         .probe          = sun4i_hdmi_probe,
 464         .remove         = sun4i_hdmi_remove,
 465         .driver         = {
 466                 .name           = "sun4i-hdmi",
 467                 .of_match_table = sun4i_hdmi_of_table,
 468         },
 469 };
 470 module_platform_driver(sun4i_hdmi_driver);
 471
 472 MODULE_AUTHOR("Maxime Ripard <maxime.ripard@free-electrons.com>");
 473 MODULE_DESCRIPTION("Allwinner A10 HDMI Driver");
 474 MODULE_LICENSE("GPL");