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