drivers/staging/gma500/cdv_intel_hdmi.c

   1 /*
   2  * Copyright © 2006-2011 Intel Corporation
   3  *
   4  * Permission is hereby granted, free of charge, to any person obtaining a
   5  * copy of this software and associated documentation files (the "Software"),
   6  * to deal in the Software without restriction, including without limitation
   7  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
   8  * and/or sell copies of the Software, and to permit persons to whom the
   9  * Software is furnished to do so, subject to the following conditions:
  10  *
  11  * The above copyright notice and this permission notice (including the next
  12  * paragraph) shall be included in all copies or substantial portions of the
  13  * Software.
  14  *
  15  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  16  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  17  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  18  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  19  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
  20  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
  21  * DEALINGS IN THE SOFTWARE.
  22  *
  23  * Authors:
  24  *      jim liu <jim.liu@intel.com>
  25  *
  26  * FIXME:
  27  *      We should probably make this generic and share it with Medfield
  28  */
  29
  30 #include <drm/drmP.h>
  31 #include <drm/drm.h>
  32 #include <drm/drm_crtc.h>
  33 #include <drm/drm_edid.h>
  34 #include "psb_intel_drv.h"
  35 #include "psb_drv.h"
  36 #include "psb_intel_reg.h"
  37 #include <linux/pm_runtime.h>
  38
  39 /* hdmi control bits */
  40 #define HDMI_NULL_PACKETS_DURING_VSYNC  (1 << 9)
  41 #define HDMI_BORDER_ENABLE              (1 << 7)
  42 #define HDMI_AUDIO_ENABLE               (1 << 6)
  43 #define HDMI_VSYNC_ACTIVE_HIGH          (1 << 4)
  44 #define HDMI_HSYNC_ACTIVE_HIGH          (1 << 3)
  45 /* hdmi-b control bits */
  46 #define HDMIB_PIPE_B_SELECT             (1 << 30)
  47
  48
  49 struct mid_intel_hdmi_priv {
  50         u32 hdmi_reg;
  51         u32 save_HDMIB;
  52         bool has_hdmi_sink;
  53         bool has_hdmi_audio;
  54         /* Should set this when detect hotplug */
  55         bool hdmi_device_connected;
  56         struct mdfld_hdmi_i2c *i2c_bus;
  57         struct i2c_adapter *hdmi_i2c_adapter;   /* for control functions */
  58         struct drm_device *dev;
  59 };
  60
  61 static void cdv_hdmi_mode_set(struct drm_encoder *encoder,
  62                         struct drm_display_mode *mode,
  63                         struct drm_display_mode *adjusted_mode)
  64 {
  65         struct drm_device *dev = encoder->dev;
  66         struct psb_intel_output *output = enc_to_psb_intel_output(encoder);
  67         struct mid_intel_hdmi_priv *hdmi_priv = output->dev_priv;
  68         u32 hdmib;
  69         struct drm_crtc *crtc = encoder->crtc;
  70         struct psb_intel_crtc *intel_crtc = to_psb_intel_crtc(crtc);
  71
  72         hdmib = (2 << 10);
  73
  74         if (adjusted_mode->flags & DRM_MODE_FLAG_PVSYNC)
  75                 hdmib |= HDMI_VSYNC_ACTIVE_HIGH;
  76         if (adjusted_mode->flags & DRM_MODE_FLAG_PHSYNC)
  77                 hdmib |= HDMI_HSYNC_ACTIVE_HIGH;
  78
  79         if (intel_crtc->pipe == 1)
  80                 hdmib |= HDMIB_PIPE_B_SELECT;
  81
  82         if (hdmi_priv->has_hdmi_audio) {
  83                 hdmib |= HDMI_AUDIO_ENABLE;
  84                 hdmib |= HDMI_NULL_PACKETS_DURING_VSYNC;
  85         }
  86
  87         REG_WRITE(hdmi_priv->hdmi_reg, hdmib);
  88         REG_READ(hdmi_priv->hdmi_reg);
  89 }
  90
  91 static bool cdv_hdmi_mode_fixup(struct drm_encoder *encoder,
  92                                   struct drm_display_mode *mode,
  93                                   struct drm_display_mode *adjusted_mode)
  94 {
  95         return true;
  96 }
  97
  98 static void cdv_hdmi_dpms(struct drm_encoder *encoder, int mode)
  99 {
 100         struct drm_device *dev = encoder->dev;
 101         struct psb_intel_output *output = enc_to_psb_intel_output(encoder);
 102         struct mid_intel_hdmi_priv *hdmi_priv = output->dev_priv;
 103         u32 hdmib;
 104
 105         hdmib = REG_READ(hdmi_priv->hdmi_reg);
 106
 107         if (mode != DRM_MODE_DPMS_ON)
 108                 REG_WRITE(hdmi_priv->hdmi_reg, hdmib & ~HDMIB_PORT_EN);
 109         else
 110                 REG_WRITE(hdmi_priv->hdmi_reg, hdmib | HDMIB_PORT_EN);
 111         REG_READ(hdmi_priv->hdmi_reg);
 112 }
 113
 114 static void cdv_hdmi_save(struct drm_connector *connector)
 115 {
 116         struct drm_device *dev = connector->dev;
 117         struct psb_intel_output *output = to_psb_intel_output(connector);
 118         struct mid_intel_hdmi_priv *hdmi_priv = output->dev_priv;
 119
 120         hdmi_priv->save_HDMIB = REG_READ(hdmi_priv->hdmi_reg);
 121 }
 122
 123 static void cdv_hdmi_restore(struct drm_connector *connector)
 124 {
 125         struct drm_device *dev = connector->dev;
 126         struct psb_intel_output *output = to_psb_intel_output(connector);
 127         struct mid_intel_hdmi_priv *hdmi_priv = output->dev_priv;
 128
 129         REG_WRITE(hdmi_priv->hdmi_reg, hdmi_priv->save_HDMIB);
 130         REG_READ(hdmi_priv->hdmi_reg);
 131 }
 132
 133 static enum drm_connector_status cdv_hdmi_detect(
 134                                 struct drm_connector *connector, bool force)
 135 {
 136         struct psb_intel_output *psb_intel_output =
 137                                                 to_psb_intel_output(connector);
 138         struct mid_intel_hdmi_priv *hdmi_priv = psb_intel_output->dev_priv;
 139         struct edid *edid = NULL;
 140         enum drm_connector_status status = connector_status_disconnected;
 141
 142         edid = drm_get_edid(&psb_intel_output->base,
 143                          psb_intel_output->hdmi_i2c_adapter);
 144
 145         hdmi_priv->has_hdmi_sink = false;
 146         hdmi_priv->has_hdmi_audio = false;
 147         if (edid) {
 148                 if (edid->input & DRM_EDID_INPUT_DIGITAL) {
 149                         status = connector_status_connected;
 150                         hdmi_priv->has_hdmi_sink =
 151                                                 drm_detect_hdmi_monitor(edid);
 152                         hdmi_priv->has_hdmi_audio =
 153                                                 drm_detect_monitor_audio(edid);
 154                 }
 155
 156                 psb_intel_output->base.display_info.raw_edid = NULL;
 157                 kfree(edid);
 158         }
 159         return status;
 160 }
 161
 162 static int cdv_hdmi_set_property(struct drm_connector *connector,
 163                                        struct drm_property *property,
 164                                        uint64_t value)
 165 {
 166         struct drm_encoder *encoder = connector->encoder;
 167
 168         if (!strcmp(property->name, "scaling mode") && encoder) {
 169                 struct psb_intel_crtc *crtc = to_psb_intel_crtc(encoder->crtc);
 170                 bool centre;
 171                 uint64_t curValue;
 172
 173                 if (!crtc)
 174                         return -1;
 175
 176                 switch (value) {
 177                 case DRM_MODE_SCALE_FULLSCREEN:
 178                         break;
 179                 case DRM_MODE_SCALE_NO_SCALE:
 180                         break;
 181                 case DRM_MODE_SCALE_ASPECT:
 182                         break;
 183                 default:
 184                         return -1;
 185                 }
 186
 187                 if (drm_connector_property_get_value(connector,
 188                                                         property, &curValue))
 189                         return -1;
 190
 191                 if (curValue == value)
 192                         return 0;
 193
 194                 if (drm_connector_property_set_value(connector,
 195                                                         property, value))
 196                         return -1;
 197
 198                 centre = (curValue == DRM_MODE_SCALE_NO_SCALE) ||
 199                         (value == DRM_MODE_SCALE_NO_SCALE);
 200
 201                 if (crtc->saved_mode.hdisplay != 0 &&
 202                     crtc->saved_mode.vdisplay != 0) {
 203                         if (centre) {
 204                                 if (!drm_crtc_helper_set_mode(encoder->crtc, &crtc->saved_mode,
 205                                             encoder->crtc->x, encoder->crtc->y, encoder->crtc->fb))
 206                                         return -1;
 207                         } else {
 208                                 struct drm_encoder_helper_funcs *helpers
 209                                                     = encoder->helper_private;
 210                                 helpers->mode_set(encoder, &crtc->saved_mode,
 211                                              &crtc->saved_adjusted_mode);
 212                         }
 213                 }
 214         }
 215         return 0;
 216 }
 217
 218 /*
 219  * Return the list of HDMI DDC modes if available.
 220  */
 221 static int cdv_hdmi_get_modes(struct drm_connector *connector)
 222 {
 223         struct psb_intel_output *psb_intel_output =
 224                                         to_psb_intel_output(connector);
 225         struct edid *edid = NULL;
 226         int ret = 0;
 227
 228         edid = drm_get_edid(&psb_intel_output->base,
 229                          psb_intel_output->hdmi_i2c_adapter);
 230         if (edid) {
 231                 drm_mode_connector_update_edid_property(&psb_intel_output->
 232                                                         base, edid);
 233                 ret = drm_add_edid_modes(&psb_intel_output->base, edid);
 234                 kfree(edid);
 235         }
 236         return ret;
 237 }
 238
 239 static int cdv_hdmi_mode_valid(struct drm_connector *connector,
 240                                  struct drm_display_mode *mode)
 241 {
 242
 243         if (mode->clock > 165000)
 244                 return MODE_CLOCK_HIGH;
 245         if (mode->clock < 20000)
 246                 return MODE_CLOCK_HIGH;
 247
 248         /* just in case */
 249         if (mode->flags & DRM_MODE_FLAG_DBLSCAN)
 250                 return MODE_NO_DBLESCAN;
 251
 252         /* just in case */
 253         if (mode->flags & DRM_MODE_FLAG_INTERLACE)
 254                 return MODE_NO_INTERLACE;
 255
 256         /*
 257          * FIXME: for now we limit the size to 1680x1050 on CDV, otherwise it
 258          * will go beyond the stolen memory size allocated to the framebuffer
 259          */
 260         if (mode->hdisplay > 1680)
 261                 return MODE_PANEL;
 262         if (mode->vdisplay > 1050)
 263                 return MODE_PANEL;
 264         return MODE_OK;
 265 }
 266
 267 static void cdv_hdmi_destroy(struct drm_connector *connector)
 268 {
 269         struct psb_intel_output *psb_intel_output =
 270                                         to_psb_intel_output(connector);
 271
 272         if (psb_intel_output->ddc_bus)
 273                 psb_intel_i2c_destroy(psb_intel_output->ddc_bus);
 274         drm_sysfs_connector_remove(connector);
 275         drm_connector_cleanup(connector);
 276         kfree(connector);
 277 }
 278
 279 static const struct drm_encoder_helper_funcs cdv_hdmi_helper_funcs = {
 280         .dpms = cdv_hdmi_dpms,
 281         .mode_fixup = cdv_hdmi_mode_fixup,
 282         .prepare = psb_intel_encoder_prepare,
 283         .mode_set = cdv_hdmi_mode_set,
 284         .commit = psb_intel_encoder_commit,
 285 };
 286
 287 static const struct drm_connector_helper_funcs
 288                                         cdv_hdmi_connector_helper_funcs = {
 289         .get_modes = cdv_hdmi_get_modes,
 290         .mode_valid = cdv_hdmi_mode_valid,
 291         .best_encoder = psb_intel_best_encoder,
 292 };
 293
 294 static const struct drm_connector_funcs cdv_hdmi_connector_funcs = {
 295         .dpms = drm_helper_connector_dpms,
 296         .save = cdv_hdmi_save,
 297         .restore = cdv_hdmi_restore,
 298         .detect = cdv_hdmi_detect,
 299         .fill_modes = drm_helper_probe_single_connector_modes,
 300         .set_property = cdv_hdmi_set_property,
 301         .destroy = cdv_hdmi_destroy,
 302 };
 303
 304 void cdv_hdmi_init(struct drm_device *dev,
 305                         struct psb_intel_mode_device *mode_dev, int reg)
 306 {
 307         struct psb_intel_output *psb_intel_output;
 308         struct drm_connector *connector;
 309         struct drm_encoder *encoder;
 310         struct mid_intel_hdmi_priv *hdmi_priv;
 311         int ddc_bus;
 312
 313         psb_intel_output = kzalloc(sizeof(struct psb_intel_output) +
 314                                sizeof(struct mid_intel_hdmi_priv), GFP_KERNEL);
 315         if (!psb_intel_output)
 316                 return;
 317
 318         hdmi_priv = (struct mid_intel_hdmi_priv *)(psb_intel_output + 1);
 319         psb_intel_output->mode_dev = mode_dev;
 320         connector = &psb_intel_output->base;
 321         encoder = &psb_intel_output->enc;
 322         drm_connector_init(dev, &psb_intel_output->base,
 323                            &cdv_hdmi_connector_funcs,
 324                            DRM_MODE_CONNECTOR_DVID);
 325
 326         drm_encoder_init(dev, &psb_intel_output->enc, &psb_intel_lvds_enc_funcs,
 327                          DRM_MODE_ENCODER_TMDS);
 328
 329         drm_mode_connector_attach_encoder(&psb_intel_output->base,
 330                                           &psb_intel_output->enc);
 331         psb_intel_output->type = INTEL_OUTPUT_HDMI;
 332         hdmi_priv->hdmi_reg = reg;
 333         hdmi_priv->has_hdmi_sink = false;
 334         psb_intel_output->dev_priv = hdmi_priv;
 335
 336         drm_encoder_helper_add(encoder, &cdv_hdmi_helper_funcs);
 337         drm_connector_helper_add(connector,
 338                                  &cdv_hdmi_connector_helper_funcs);
 339         connector->display_info.subpixel_order = SubPixelHorizontalRGB;
 340         connector->interlace_allowed = false;
 341         connector->doublescan_allowed = false;
 342
 343         drm_connector_attach_property(connector,
 344             dev->mode_config.scaling_mode_property, DRM_MODE_SCALE_FULLSCREEN);
 345
 346         switch (reg) {
 347         case SDVOB:
 348                 ddc_bus = GPIOE;
 349                 break;
 350         case SDVOC:
 351                 ddc_bus = GPIOD;
 352                 break;
 353         default:
 354                 DRM_ERROR("unknown reg 0x%x for HDMI\n", reg);
 355                 goto failed_ddc;
 356                 break;
 357         }
 358
 359         psb_intel_output->ddc_bus = psb_intel_i2c_create(dev,
 360                                 ddc_bus, (reg == SDVOB) ? "HDMIB" : "HDMIC");
 361
 362         if (!psb_intel_output->ddc_bus) {
 363                 dev_err(dev->dev, "No ddc adapter available!\n");
 364                 goto failed_ddc;
 365         }
 366         psb_intel_output->hdmi_i2c_adapter =
 367                                 &(psb_intel_output->ddc_bus->adapter);
 368         hdmi_priv->dev = dev;
 369         drm_sysfs_connector_add(connector);
 370         return;
 371
 372 failed_ddc:
 373         drm_encoder_cleanup(&psb_intel_output->enc);
 374         drm_connector_cleanup(&psb_intel_output->base);
 375         kfree(psb_intel_output);
 376 }