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