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