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/slab.h>
  31 #include <linux/delay.h>
  32 #include "drmP.h"
  33 #include "drm.h"
  34 #include "drm_crtc.h"
  35 #include "drm_edid.h"
  36 #include "intel_drv.h"
  37 #include "i915_drm.h"
  38 #include "i915_drv.h"
  39
  40 struct intel_hdmi_priv {
  41         u32 sdvox_reg;
  42         u32 save_SDVOX;
  43         bool has_hdmi_sink;
  44 };
  45
  46 static void intel_hdmi_mode_set(struct drm_encoder *encoder,
  47                                 struct drm_display_mode *mode,
  48                                 struct drm_display_mode *adjusted_mode)
  49 {
  50         struct drm_device *dev = encoder->dev;
  51         struct drm_i915_private *dev_priv = dev->dev_private;
  52         struct drm_crtc *crtc = encoder->crtc;
  53         struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
  54         struct intel_output *intel_output = enc_to_intel_output(encoder);
  55         struct intel_hdmi_priv *hdmi_priv = intel_output->dev_priv;
  56         u32 sdvox;
  57
  58         sdvox = SDVO_ENCODING_HDMI |
  59                 SDVO_BORDER_ENABLE |
  60                 SDVO_VSYNC_ACTIVE_HIGH |
  61                 SDVO_HSYNC_ACTIVE_HIGH;
  62
  63         if (hdmi_priv->has_hdmi_sink)
  64                 sdvox |= SDVO_AUDIO_ENABLE;
  65
  66         if (intel_crtc->pipe == 1)
  67                 sdvox |= SDVO_PIPE_B_SELECT;
  68
  69         I915_WRITE(hdmi_priv->sdvox_reg, sdvox);
  70         POSTING_READ(hdmi_priv->sdvox_reg);
  71 }
  72
  73 static void intel_hdmi_dpms(struct drm_encoder *encoder, int mode)
  74 {
  75         struct drm_device *dev = encoder->dev;
  76         struct drm_i915_private *dev_priv = dev->dev_private;
  77         struct intel_output *intel_output = enc_to_intel_output(encoder);
  78         struct intel_hdmi_priv *hdmi_priv = intel_output->dev_priv;
  79         u32 temp;
  80
  81         temp = I915_READ(hdmi_priv->sdvox_reg);
  82
  83         /* HW workaround, need to toggle enable bit off and on for 12bpc, but
  84          * we do this anyway which shows more stable in testing.
  85          */
  86         if (HAS_PCH_SPLIT(dev)) {
  87                 I915_WRITE(hdmi_priv->sdvox_reg, temp & ~SDVO_ENABLE);
  88                 POSTING_READ(hdmi_priv->sdvox_reg);
  89         }
  90
  91         if (mode != DRM_MODE_DPMS_ON) {
  92                 temp &= ~SDVO_ENABLE;
  93         } else {
  94                 temp |= SDVO_ENABLE;
  95         }
  96
  97         I915_WRITE(hdmi_priv->sdvox_reg, temp);
  98         POSTING_READ(hdmi_priv->sdvox_reg);
  99
 100         /* HW workaround, need to write this twice for issue that may result
 101          * in first write getting masked.
 102          */
 103         if (HAS_PCH_SPLIT(dev)) {
 104                 I915_WRITE(hdmi_priv->sdvox_reg, temp);
 105                 POSTING_READ(hdmi_priv->sdvox_reg);
 106         }
 107 }
 108
 109 static void intel_hdmi_save(struct drm_connector *connector)
 110 {
 111         struct drm_device *dev = connector->dev;
 112         struct drm_i915_private *dev_priv = dev->dev_private;
 113         struct intel_output *intel_output = to_intel_output(connector);
 114         struct intel_hdmi_priv *hdmi_priv = intel_output->dev_priv;
 115
 116         hdmi_priv->save_SDVOX = I915_READ(hdmi_priv->sdvox_reg);
 117 }
 118
 119 static void intel_hdmi_restore(struct drm_connector *connector)
 120 {
 121         struct drm_device *dev = connector->dev;
 122         struct drm_i915_private *dev_priv = dev->dev_private;
 123         struct intel_output *intel_output = to_intel_output(connector);
 124         struct intel_hdmi_priv *hdmi_priv = intel_output->dev_priv;
 125
 126         I915_WRITE(hdmi_priv->sdvox_reg, hdmi_priv->save_SDVOX);
 127         POSTING_READ(hdmi_priv->sdvox_reg);
 128 }
 129
 130 static int intel_hdmi_mode_valid(struct drm_connector *connector,
 131                                  struct drm_display_mode *mode)
 132 {
 133         if (mode->clock > 165000)
 134                 return MODE_CLOCK_HIGH;
 135         if (mode->clock < 20000)
 136                 return MODE_CLOCK_HIGH;
 137
 138         if (mode->flags & DRM_MODE_FLAG_DBLSCAN)
 139                 return MODE_NO_DBLESCAN;
 140
 141         return MODE_OK;
 142 }
 143
 144 static bool intel_hdmi_mode_fixup(struct drm_encoder *encoder,
 145                                   struct drm_display_mode *mode,
 146                                   struct drm_display_mode *adjusted_mode)
 147 {
 148         return true;
 149 }
 150
 151 static enum drm_connector_status
 152 intel_hdmi_detect(struct drm_connector *connector)
 153 {
 154         struct intel_output *intel_output = to_intel_output(connector);
 155         struct intel_hdmi_priv *hdmi_priv = intel_output->dev_priv;
 156         struct edid *edid = NULL;
 157         enum drm_connector_status status = connector_status_disconnected;
 158
 159         hdmi_priv->has_hdmi_sink = false;
 160         edid = drm_get_edid(&intel_output->base,
 161                             intel_output->ddc_bus);
 162
 163         if (edid) {
 164                 if (edid->input & DRM_EDID_INPUT_DIGITAL) {
 165                         status = connector_status_connected;
 166                         hdmi_priv->has_hdmi_sink = drm_detect_hdmi_monitor(edid);
 167                 }
 168                 intel_output->base.display_info.raw_edid = NULL;
 169                 kfree(edid);
 170         }
 171
 172         return status;
 173 }
 174
 175 static int intel_hdmi_get_modes(struct drm_connector *connector)
 176 {
 177         struct intel_output *intel_output = to_intel_output(connector);
 178
 179         /* We should parse the EDID data and find out if it's an HDMI sink so
 180          * we can send audio to it.
 181          */
 182
 183         return intel_ddc_get_modes(intel_output);
 184 }
 185
 186 static void intel_hdmi_destroy(struct drm_connector *connector)
 187 {
 188         struct intel_output *intel_output = to_intel_output(connector);
 189
 190         if (intel_output->i2c_bus)
 191                 intel_i2c_destroy(intel_output->i2c_bus);
 192         drm_sysfs_connector_remove(connector);
 193         drm_connector_cleanup(connector);
 194         kfree(intel_output);
 195 }
 196
 197 static const struct drm_encoder_helper_funcs intel_hdmi_helper_funcs = {
 198         .dpms = intel_hdmi_dpms,
 199         .mode_fixup = intel_hdmi_mode_fixup,
 200         .prepare = intel_encoder_prepare,
 201         .mode_set = intel_hdmi_mode_set,
 202         .commit = intel_encoder_commit,
 203 };
 204
 205 static const struct drm_connector_funcs intel_hdmi_connector_funcs = {
 206         .dpms = drm_helper_connector_dpms,
 207         .save = intel_hdmi_save,
 208         .restore = intel_hdmi_restore,
 209         .detect = intel_hdmi_detect,
 210         .fill_modes = drm_helper_probe_single_connector_modes,
 211         .destroy = intel_hdmi_destroy,
 212 };
 213
 214 static const struct drm_connector_helper_funcs intel_hdmi_connector_helper_funcs = {
 215         .get_modes = intel_hdmi_get_modes,
 216         .mode_valid = intel_hdmi_mode_valid,
 217         .best_encoder = intel_best_encoder,
 218 };
 219
 220 static void intel_hdmi_enc_destroy(struct drm_encoder *encoder)
 221 {
 222         drm_encoder_cleanup(encoder);
 223 }
 224
 225 static const struct drm_encoder_funcs intel_hdmi_enc_funcs = {
 226         .destroy = intel_hdmi_enc_destroy,
 227 };
 228
 229 void intel_hdmi_init(struct drm_device *dev, int sdvox_reg)
 230 {
 231         struct drm_i915_private *dev_priv = dev->dev_private;
 232         struct drm_connector *connector;
 233         struct intel_output *intel_output;
 234         struct intel_hdmi_priv *hdmi_priv;
 235
 236         intel_output = kcalloc(sizeof(struct intel_output) +
 237                                sizeof(struct intel_hdmi_priv), 1, GFP_KERNEL);
 238         if (!intel_output)
 239                 return;
 240         hdmi_priv = (struct intel_hdmi_priv *)(intel_output + 1);
 241
 242         connector = &intel_output->base;
 243         drm_connector_init(dev, connector, &intel_hdmi_connector_funcs,
 244                            DRM_MODE_CONNECTOR_HDMIA);
 245         drm_connector_helper_add(connector, &intel_hdmi_connector_helper_funcs);
 246
 247         intel_output->type = INTEL_OUTPUT_HDMI;
 248
 249         connector->interlace_allowed = 0;
 250         connector->doublescan_allowed = 0;
 251         intel_output->crtc_mask = (1 << 0) | (1 << 1);
 252
 253         /* Set up the DDC bus. */
 254         if (sdvox_reg == SDVOB) {
 255                 intel_output->clone_mask = (1 << INTEL_HDMIB_CLONE_BIT);
 256                 intel_output->ddc_bus = intel_i2c_create(dev, GPIOE, "HDMIB");
 257                 dev_priv->hotplug_supported_mask |= HDMIB_HOTPLUG_INT_STATUS;
 258         } else if (sdvox_reg == SDVOC) {
 259                 intel_output->clone_mask = (1 << INTEL_HDMIC_CLONE_BIT);
 260                 intel_output->ddc_bus = intel_i2c_create(dev, GPIOD, "HDMIC");
 261                 dev_priv->hotplug_supported_mask |= HDMIC_HOTPLUG_INT_STATUS;
 262         } else if (sdvox_reg == HDMIB) {
 263                 intel_output->clone_mask = (1 << INTEL_HDMID_CLONE_BIT);
 264                 intel_output->ddc_bus = intel_i2c_create(dev, PCH_GPIOE,
 265                                                                 "HDMIB");
 266                 dev_priv->hotplug_supported_mask |= HDMIB_HOTPLUG_INT_STATUS;
 267         } else if (sdvox_reg == HDMIC) {
 268                 intel_output->clone_mask = (1 << INTEL_HDMIE_CLONE_BIT);
 269                 intel_output->ddc_bus = intel_i2c_create(dev, PCH_GPIOD,
 270                                                                 "HDMIC");
 271                 dev_priv->hotplug_supported_mask |= HDMIC_HOTPLUG_INT_STATUS;
 272         } else if (sdvox_reg == HDMID) {
 273                 intel_output->clone_mask = (1 << INTEL_HDMIF_CLONE_BIT);
 274                 intel_output->ddc_bus = intel_i2c_create(dev, PCH_GPIOF,
 275                                                                 "HDMID");
 276                 dev_priv->hotplug_supported_mask |= HDMID_HOTPLUG_INT_STATUS;
 277         }
 278         if (!intel_output->ddc_bus)
 279                 goto err_connector;
 280
 281         hdmi_priv->sdvox_reg = sdvox_reg;
 282         intel_output->dev_priv = hdmi_priv;
 283
 284         drm_encoder_init(dev, &intel_output->enc, &intel_hdmi_enc_funcs,
 285                          DRM_MODE_ENCODER_TMDS);
 286         drm_encoder_helper_add(&intel_output->enc, &intel_hdmi_helper_funcs);
 287
 288         drm_mode_connector_attach_encoder(&intel_output->base,
 289                                           &intel_output->enc);
 290         drm_sysfs_connector_add(connector);
 291
 292         /* For G4X desktop chip, PEG_BAND_GAP_DATA 3:0 must first be written
 293          * 0xd.  Failure to do so will result in spurious interrupts being
 294          * generated on the port when a cable is not attached.
 295          */
 296         if (IS_G4X(dev) && !IS_GM45(dev)) {
 297                 u32 temp = I915_READ(PEG_BAND_GAP_DATA);
 298                 I915_WRITE(PEG_BAND_GAP_DATA, (temp & ~0xf) | 0xd);
 299         }
 300
 301         return;
 302
 303 err_connector:
 304         drm_connector_cleanup(connector);
 305         kfree(intel_output);
 306
 307         return;
 308 }