drivers/gpu/drm/i915/intel_hdmi.c

   1 /*
   2  * Copyright 2006 Dave Airlie <airlied@linux.ie>
   3  * Copyright © 2006-2009 Intel Corporation
   4  *
   5  * Permission is hereby granted, free of charge, to any person obtaining a
   6  * copy of this software and associated documentation files (the "Software"),
   7  * to deal in the Software without restriction, including without limitation
   8  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
   9  * and/or sell copies of the Software, and to permit persons to whom the
  10  * Software is furnished to do so, subject to the following conditions:
  11  *
  12  * The above copyright notice and this permission notice (including the next
  13  * paragraph) shall be included in all copies or substantial portions of the
  14  * Software.
  15  *
  16  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  17  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  18  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  19  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  20  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
  21  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
  22  * DEALINGS IN THE SOFTWARE.
  23  *
  24  * Authors:
  25  *      Eric Anholt <eric@anholt.net>
  26  *      Jesse Barnes <jesse.barnes@intel.com>
  27  */
  28
  29 #include <linux/i2c.h>
  30 #include <linux/delay.h>
  31 #include "drmP.h"
  32 #include "drm.h"
  33 #include "drm_crtc.h"
  34 #include "drm_edid.h"
  35 #include "intel_drv.h"
  36 #include "i915_drm.h"
  37 #include "i915_drv.h"
  38
  39 struct intel_hdmi_priv {
  40         u32 sdvox_reg;
  41         u32 save_SDVOX;
  42         bool has_hdmi_sink;
  43 };
  44
  45 static void intel_hdmi_mode_set(struct drm_encoder *encoder,
  46                                 struct drm_display_mode *mode,
  47                                 struct drm_display_mode *adjusted_mode)
  48 {
  49         struct drm_device *dev = encoder->dev;
  50         struct drm_i915_private *dev_priv = dev->dev_private;
  51         struct drm_crtc *crtc = encoder->crtc;
  52         struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
  53         struct intel_output *intel_output = enc_to_intel_output(encoder);
  54         struct intel_hdmi_priv *hdmi_priv = intel_output->dev_priv;
  55         u32 sdvox;
  56
  57         sdvox = SDVO_ENCODING_HDMI |
  58                 SDVO_BORDER_ENABLE |
  59                 SDVO_VSYNC_ACTIVE_HIGH |
  60                 SDVO_HSYNC_ACTIVE_HIGH;
  61
  62         if (hdmi_priv->has_hdmi_sink)
  63                 sdvox |= SDVO_AUDIO_ENABLE;
  64
  65         if (intel_crtc->pipe == 1)
  66                 sdvox |= SDVO_PIPE_B_SELECT;
  67
  68         I915_WRITE(hdmi_priv->sdvox_reg, sdvox);
  69         POSTING_READ(hdmi_priv->sdvox_reg);
  70 }
  71
  72 static void intel_hdmi_dpms(struct drm_encoder *encoder, int mode)
  73 {
  74         struct drm_device *dev = encoder->dev;
  75         struct drm_i915_private *dev_priv = dev->dev_private;
  76         struct intel_output *intel_output = enc_to_intel_output(encoder);
  77         struct intel_hdmi_priv *hdmi_priv = intel_output->dev_priv;
  78         u32 temp;
  79
  80         temp = I915_READ(hdmi_priv->sdvox_reg);
  81
  82         /* HW workaround, need to toggle enable bit off and on for 12bpc, but
  83          * we do this anyway which shows more stable in testing.
  84          */
  85         if (IS_IRONLAKE(dev)) {
  86                 I915_WRITE(hdmi_priv->sdvox_reg, temp & ~SDVO_ENABLE);
  87                 POSTING_READ(hdmi_priv->sdvox_reg);
  88         }
  89
  90         if (mode != DRM_MODE_DPMS_ON) {
  91                 temp &= ~SDVO_ENABLE;
  92         } else {
  93                 temp |= SDVO_ENABLE;
  94         }
  95
  96         I915_WRITE(hdmi_priv->sdvox_reg, temp);
  97         POSTING_READ(hdmi_priv->sdvox_reg);
  98
  99         /* HW workaround, need to write this twice for issue that may result
 100          * in first write getting masked.
 101          */
 102         if (IS_IRONLAKE(dev)) {
 103                 I915_WRITE(hdmi_priv->sdvox_reg, temp);
 104                 POSTING_READ(hdmi_priv->sdvox_reg);
 105         }
 106 }
 107
 108 static void intel_hdmi_save(struct drm_connector *connector)
 109 {
 110         struct drm_device *dev = connector->dev;
 111         struct drm_i915_private *dev_priv = dev->dev_private;
 112         struct intel_output *intel_output = to_intel_output(connector);
 113         struct intel_hdmi_priv *hdmi_priv = intel_output->dev_priv;
 114
 115         hdmi_priv->save_SDVOX = I915_READ(hdmi_priv->sdvox_reg);
 116 }
 117
 118 static void intel_hdmi_restore(struct drm_connector *connector)
 119 {
 120         struct drm_device *dev = connector->dev;
 121         struct drm_i915_private *dev_priv = dev->dev_private;
 122         struct intel_output *intel_output = to_intel_output(connector);
 123         struct intel_hdmi_priv *hdmi_priv = intel_output->dev_priv;
 124
 125         I915_WRITE(hdmi_priv->sdvox_reg, hdmi_priv->save_SDVOX);
 126         POSTING_READ(hdmi_priv->sdvox_reg);
 127 }
 128
 129 static int intel_hdmi_mode_valid(struct drm_connector *connector,
 130                                  struct drm_display_mode *mode)
 131 {
 132         if (mode->clock > 165000)
 133                 return MODE_CLOCK_HIGH;
 134         if (mode->clock < 20000)
 135                 return MODE_CLOCK_HIGH;
 136
 137         if (mode->flags & DRM_MODE_FLAG_DBLSCAN)
 138                 return MODE_NO_DBLESCAN;
 139
 140         return MODE_OK;
 141 }
 142
 143 static bool intel_hdmi_mode_fixup(struct drm_encoder *encoder,
 144                                   struct drm_display_mode *mode,
 145                                   struct drm_display_mode *adjusted_mode)
 146 {
 147         return true;
 148 }
 149
 150 static enum drm_connector_status
 151 intel_hdmi_detect(struct drm_connector *connector)
 152 {
 153         struct intel_output *intel_output = to_intel_output(connector);
 154         struct intel_hdmi_priv *hdmi_priv = intel_output->dev_priv;
 155         struct edid *edid = NULL;
 156         enum drm_connector_status status = connector_status_disconnected;
 157
 158         hdmi_priv->has_hdmi_sink = false;
 159         edid = drm_get_edid(&intel_output->base,
 160                             intel_output->ddc_bus);
 161
 162         if (edid) {
 163                 if (edid->input & DRM_EDID_INPUT_DIGITAL) {
 164                         status = connector_status_connected;
 165                         hdmi_priv->has_hdmi_sink = drm_detect_hdmi_monitor(edid);
 166                 }
 167                 intel_output->base.display_info.raw_edid = NULL;
 168                 kfree(edid);
 169         }
 170
 171         return status;
 172 }
 173
 174 static int intel_hdmi_get_modes(struct drm_connector *connector)
 175 {
 176         struct intel_output *intel_output = to_intel_output(connector);
 177
 178         /* We should parse the EDID data and find out if it's an HDMI sink so
 179          * we can send audio to it.
 180          */
 181
 182         return intel_ddc_get_modes(intel_output);
 183 }
 184
 185 static void intel_hdmi_destroy(struct drm_connector *connector)
 186 {
 187         struct intel_output *intel_output = to_intel_output(connector);
 188
 189         if (intel_output->i2c_bus)
 190                 intel_i2c_destroy(intel_output->i2c_bus);
 191         drm_sysfs_connector_remove(connector);
 192         drm_connector_cleanup(connector);
 193         kfree(intel_output);
 194 }
 195
 196 static const struct drm_encoder_helper_funcs intel_hdmi_helper_funcs = {
 197         .dpms = intel_hdmi_dpms,
 198         .mode_fixup = intel_hdmi_mode_fixup,
 199         .prepare = intel_encoder_prepare,
 200         .mode_set = intel_hdmi_mode_set,
 201         .commit = intel_encoder_commit,
 202 };
 203
 204 static const struct drm_connector_funcs intel_hdmi_connector_funcs = {
 205         .dpms = drm_helper_connector_dpms,
 206         .save = intel_hdmi_save,
 207         .restore = intel_hdmi_restore,
 208         .detect = intel_hdmi_detect,
 209         .fill_modes = drm_helper_probe_single_connector_modes,
 210         .destroy = intel_hdmi_destroy,
 211 };
 212
 213 static const struct drm_connector_helper_funcs intel_hdmi_connector_helper_funcs = {
 214         .get_modes = intel_hdmi_get_modes,
 215         .mode_valid = intel_hdmi_mode_valid,
 216         .best_encoder = intel_best_encoder,
 217 };
 218
 219 static void intel_hdmi_enc_destroy(struct drm_encoder *encoder)
 220 {
 221         drm_encoder_cleanup(encoder);
 222 }
 223
 224 static const struct drm_encoder_funcs intel_hdmi_enc_funcs = {
 225         .destroy = intel_hdmi_enc_destroy,
 226 };
 227
 228 /*
 229  * Enumerate the child dev array parsed from VBT to check whether
 230  * the given HDMI is present.
 231  * If it is present, return 1.
 232  * If it is not present, return false.
 233  * If no child dev is parsed from VBT, it assumes that the given
 234  * HDMI is present.
 235  */
 236 static int hdmi_is_present_in_vbt(struct drm_device *dev, int hdmi_reg)
 237 {
 238         struct drm_i915_private *dev_priv = dev->dev_private;
 239         struct child_device_config *p_child;
 240         int i, hdmi_port, ret;
 241
 242         if (!dev_priv->child_dev_num)
 243                 return 1;
 244
 245         if (hdmi_reg == SDVOB)
 246                 hdmi_port = DVO_B;
 247         else if (hdmi_reg == SDVOC)
 248                 hdmi_port = DVO_C;
 249         else if (hdmi_reg == HDMIB)
 250                 hdmi_port = DVO_B;
 251         else if (hdmi_reg == HDMIC)
 252                 hdmi_port = DVO_C;
 253         else if (hdmi_reg == HDMID)
 254                 hdmi_port = DVO_D;
 255         else
 256                 return 0;
 257
 258         ret = 0;
 259         for (i = 0; i < dev_priv->child_dev_num; i++) {
 260                 p_child = dev_priv->child_dev + i;
 261                 /*
 262                  * If the device type is not HDMI, continue.
 263                  */
 264                 if (p_child->device_type != DEVICE_TYPE_HDMI)
 265                         continue;
 266                 /* Find the HDMI port */
 267                 if (p_child->dvo_port == hdmi_port) {
 268                         ret = 1;
 269                         break;
 270                 }
 271         }
 272         return ret;
 273 }
 274 void intel_hdmi_init(struct drm_device *dev, int sdvox_reg)
 275 {
 276         struct drm_i915_private *dev_priv = dev->dev_private;
 277         struct drm_connector *connector;
 278         struct intel_output *intel_output;
 279         struct intel_hdmi_priv *hdmi_priv;
 280
 281         if (!hdmi_is_present_in_vbt(dev, sdvox_reg)) {
 282                 DRM_DEBUG_KMS("HDMI is not present. Ignored it \n");
 283                 return;
 284         }
 285         intel_output = kcalloc(sizeof(struct intel_output) +
 286                                sizeof(struct intel_hdmi_priv), 1, GFP_KERNEL);
 287         if (!intel_output)
 288                 return;
 289         hdmi_priv = (struct intel_hdmi_priv *)(intel_output + 1);
 290
 291         connector = &intel_output->base;
 292         drm_connector_init(dev, connector, &intel_hdmi_connector_funcs,
 293                            DRM_MODE_CONNECTOR_HDMIA);
 294         drm_connector_helper_add(connector, &intel_hdmi_connector_helper_funcs);
 295
 296         intel_output->type = INTEL_OUTPUT_HDMI;
 297
 298         connector->interlace_allowed = 0;
 299         connector->doublescan_allowed = 0;
 300         intel_output->crtc_mask = (1 << 0) | (1 << 1);
 301
 302         /* Set up the DDC bus. */
 303         if (sdvox_reg == SDVOB) {
 304                 intel_output->clone_mask = (1 << INTEL_HDMIB_CLONE_BIT);
 305                 intel_output->ddc_bus = intel_i2c_create(dev, GPIOE, "HDMIB");
 306         } else if (sdvox_reg == SDVOC) {
 307                 intel_output->clone_mask = (1 << INTEL_HDMIC_CLONE_BIT);
 308                 intel_output->ddc_bus = intel_i2c_create(dev, GPIOD, "HDMIC");
 309         } else if (sdvox_reg == HDMIB) {
 310                 intel_output->clone_mask = (1 << INTEL_HDMID_CLONE_BIT);
 311                 intel_output->ddc_bus = intel_i2c_create(dev, PCH_GPIOE,
 312                                                                 "HDMIB");
 313         } else if (sdvox_reg == HDMIC) {
 314                 intel_output->clone_mask = (1 << INTEL_HDMIE_CLONE_BIT);
 315                 intel_output->ddc_bus = intel_i2c_create(dev, PCH_GPIOD,
 316                                                                 "HDMIC");
 317         } else if (sdvox_reg == HDMID) {
 318                 intel_output->clone_mask = (1 << INTEL_HDMIF_CLONE_BIT);
 319                 intel_output->ddc_bus = intel_i2c_create(dev, PCH_GPIOF,
 320                                                                 "HDMID");
 321         }
 322         if (!intel_output->ddc_bus)
 323                 goto err_connector;
 324
 325         hdmi_priv->sdvox_reg = sdvox_reg;
 326         intel_output->dev_priv = hdmi_priv;
 327
 328         drm_encoder_init(dev, &intel_output->enc, &intel_hdmi_enc_funcs,
 329                          DRM_MODE_ENCODER_TMDS);
 330         drm_encoder_helper_add(&intel_output->enc, &intel_hdmi_helper_funcs);
 331
 332         drm_mode_connector_attach_encoder(&intel_output->base,
 333                                           &intel_output->enc);
 334         drm_sysfs_connector_add(connector);
 335
 336         /* For G4X desktop chip, PEG_BAND_GAP_DATA 3:0 must first be written
 337          * 0xd.  Failure to do so will result in spurious interrupts being
 338          * generated on the port when a cable is not attached.
 339          */
 340         if (IS_G4X(dev) && !IS_GM45(dev)) {
 341                 u32 temp = I915_READ(PEG_BAND_GAP_DATA);
 342                 I915_WRITE(PEG_BAND_GAP_DATA, (temp & ~0xf) | 0xd);
 343         }
 344
 345         return;
 346
 347 err_connector:
 348         drm_connector_cleanup(connector);
 349         kfree(intel_output);
 350
 351         return;
 352 }