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 {
  41         struct intel_encoder base;
  42         u32 sdvox_reg;
  43         bool has_hdmi_sink;
  44 };
  45
  46 static struct intel_hdmi *enc_to_intel_hdmi(struct drm_encoder *encoder)
  47 {
  48         return container_of(encoder, struct intel_hdmi, base.base);
  49 }
  50
  51 static struct intel_hdmi *intel_attached_hdmi(struct drm_connector *connector)
  52 {
  53         return container_of(intel_attached_encoder(connector),
  54                             struct intel_hdmi, base);
  55 }
  56
  57 static void intel_hdmi_mode_set(struct drm_encoder *encoder,
  58                                 struct drm_display_mode *mode,
  59                                 struct drm_display_mode *adjusted_mode)
  60 {
  61         struct drm_device *dev = encoder->dev;
  62         struct drm_i915_private *dev_priv = dev->dev_private;
  63         struct drm_crtc *crtc = encoder->crtc;
  64         struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
  65         struct intel_hdmi *intel_hdmi = enc_to_intel_hdmi(encoder);
  66         u32 sdvox;
  67
  68         sdvox = SDVO_ENCODING_HDMI | SDVO_BORDER_ENABLE;
  69         if (adjusted_mode->flags & DRM_MODE_FLAG_PVSYNC)
  70                 sdvox |= SDVO_VSYNC_ACTIVE_HIGH;
  71         if (adjusted_mode->flags & DRM_MODE_FLAG_PHSYNC)
  72                 sdvox |= SDVO_HSYNC_ACTIVE_HIGH;
  73
  74         if (intel_hdmi->has_hdmi_sink) {
  75                 sdvox |= SDVO_AUDIO_ENABLE;
  76                 if (HAS_PCH_CPT(dev))
  77                         sdvox |= HDMI_MODE_SELECT;
  78         }
  79
  80         if (intel_crtc->pipe == 1) {
  81                 if (HAS_PCH_CPT(dev))
  82                         sdvox |= PORT_TRANS_B_SEL_CPT;
  83                 else
  84                         sdvox |= SDVO_PIPE_B_SELECT;
  85         }
  86
  87         I915_WRITE(intel_hdmi->sdvox_reg, sdvox);
  88         POSTING_READ(intel_hdmi->sdvox_reg);
  89 }
  90
  91 static void intel_hdmi_dpms(struct drm_encoder *encoder, int mode)
  92 {
  93         struct drm_device *dev = encoder->dev;
  94         struct drm_i915_private *dev_priv = dev->dev_private;
  95         struct intel_hdmi *intel_hdmi = enc_to_intel_hdmi(encoder);
  96         u32 temp;
  97
  98         temp = I915_READ(intel_hdmi->sdvox_reg);
  99
 100         /* HW workaround, need to toggle enable bit off and on for 12bpc, but
 101          * we do this anyway which shows more stable in testing.
 102          */
 103         if (HAS_PCH_SPLIT(dev)) {
 104                 I915_WRITE(intel_hdmi->sdvox_reg, temp & ~SDVO_ENABLE);
 105                 POSTING_READ(intel_hdmi->sdvox_reg);
 106         }
 107
 108         if (mode != DRM_MODE_DPMS_ON) {
 109                 temp &= ~SDVO_ENABLE;
 110         } else {
 111                 temp |= SDVO_ENABLE;
 112         }
 113
 114         I915_WRITE(intel_hdmi->sdvox_reg, temp);
 115         POSTING_READ(intel_hdmi->sdvox_reg);
 116
 117         /* HW workaround, need to write this twice for issue that may result
 118          * in first write getting masked.
 119          */
 120         if (HAS_PCH_SPLIT(dev)) {
 121                 I915_WRITE(intel_hdmi->sdvox_reg, temp);
 122                 POSTING_READ(intel_hdmi->sdvox_reg);
 123         }
 124 }
 125
 126 static int intel_hdmi_mode_valid(struct drm_connector *connector,
 127                                  struct drm_display_mode *mode)
 128 {
 129         if (mode->clock > 165000)
 130                 return MODE_CLOCK_HIGH;
 131         if (mode->clock < 20000)
 132                 return MODE_CLOCK_HIGH;
 133
 134         if (mode->flags & DRM_MODE_FLAG_DBLSCAN)
 135                 return MODE_NO_DBLESCAN;
 136
 137         return MODE_OK;
 138 }
 139
 140 static bool intel_hdmi_mode_fixup(struct drm_encoder *encoder,
 141                                   struct drm_display_mode *mode,
 142                                   struct drm_display_mode *adjusted_mode)
 143 {
 144         return true;
 145 }
 146
 147 static enum drm_connector_status
 148 intel_hdmi_detect(struct drm_connector *connector)
 149 {
 150         struct intel_hdmi *intel_hdmi = intel_attached_hdmi(connector);
 151         struct edid *edid = NULL;
 152         enum drm_connector_status status = connector_status_disconnected;
 153
 154         intel_hdmi->has_hdmi_sink = false;
 155         edid = drm_get_edid(connector, intel_hdmi->base.ddc_bus);
 156
 157         if (edid) {
 158                 if (edid->input & DRM_EDID_INPUT_DIGITAL) {
 159                         status = connector_status_connected;
 160                         intel_hdmi->has_hdmi_sink = drm_detect_hdmi_monitor(edid);
 161                 }
 162                 connector->display_info.raw_edid = NULL;
 163                 kfree(edid);
 164         }
 165
 166         return status;
 167 }
 168
 169 static int intel_hdmi_get_modes(struct drm_connector *connector)
 170 {
 171         struct intel_hdmi *intel_hdmi = intel_attached_hdmi(connector);
 172
 173         /* We should parse the EDID data and find out if it's an HDMI sink so
 174          * we can send audio to it.
 175          */
 176
 177         return intel_ddc_get_modes(connector, intel_hdmi->base.ddc_bus);
 178 }
 179
 180 static void intel_hdmi_destroy(struct drm_connector *connector)
 181 {
 182         drm_sysfs_connector_remove(connector);
 183         drm_connector_cleanup(connector);
 184         kfree(connector);
 185 }
 186
 187 static const struct drm_encoder_helper_funcs intel_hdmi_helper_funcs = {
 188         .dpms = intel_hdmi_dpms,
 189         .mode_fixup = intel_hdmi_mode_fixup,
 190         .prepare = intel_encoder_prepare,
 191         .mode_set = intel_hdmi_mode_set,
 192         .commit = intel_encoder_commit,
 193 };
 194
 195 static const struct drm_connector_funcs intel_hdmi_connector_funcs = {
 196         .dpms = drm_helper_connector_dpms,
 197         .detect = intel_hdmi_detect,
 198         .fill_modes = drm_helper_probe_single_connector_modes,
 199         .destroy = intel_hdmi_destroy,
 200 };
 201
 202 static const struct drm_connector_helper_funcs intel_hdmi_connector_helper_funcs = {
 203         .get_modes = intel_hdmi_get_modes,
 204         .mode_valid = intel_hdmi_mode_valid,
 205         .best_encoder = intel_best_encoder,
 206 };
 207
 208 static const struct drm_encoder_funcs intel_hdmi_enc_funcs = {
 209         .destroy = intel_encoder_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 *intel_hdmi;
 219
 220         intel_hdmi = kzalloc(sizeof(struct intel_hdmi), GFP_KERNEL);
 221         if (!intel_hdmi)
 222                 return;
 223
 224         intel_connector = kzalloc(sizeof(struct intel_connector), GFP_KERNEL);
 225         if (!intel_connector) {
 226                 kfree(intel_hdmi);
 227                 return;
 228         }
 229
 230         intel_encoder = &intel_hdmi->base;
 231         drm_encoder_init(dev, &intel_encoder->base, &intel_hdmi_enc_funcs,
 232                          DRM_MODE_ENCODER_TMDS);
 233
 234         connector = &intel_connector->base;
 235         drm_connector_init(dev, connector, &intel_hdmi_connector_funcs,
 236                            DRM_MODE_CONNECTOR_HDMIA);
 237         drm_connector_helper_add(connector, &intel_hdmi_connector_helper_funcs);
 238
 239         intel_encoder->type = INTEL_OUTPUT_HDMI;
 240
 241         connector->polled = DRM_CONNECTOR_POLL_HPD;
 242         connector->interlace_allowed = 0;
 243         connector->doublescan_allowed = 0;
 244         intel_encoder->crtc_mask = (1 << 0) | (1 << 1);
 245
 246         /* Set up the DDC bus. */
 247         if (sdvox_reg == SDVOB) {
 248                 intel_encoder->clone_mask = (1 << INTEL_HDMIB_CLONE_BIT);
 249                 intel_encoder->ddc_bus = intel_i2c_create(intel_encoder,
 250                                                           GPIOE, "HDMIB");
 251                 dev_priv->hotplug_supported_mask |= HDMIB_HOTPLUG_INT_STATUS;
 252         } else if (sdvox_reg == SDVOC) {
 253                 intel_encoder->clone_mask = (1 << INTEL_HDMIC_CLONE_BIT);
 254                 intel_encoder->ddc_bus = intel_i2c_create(intel_encoder,
 255                                                           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(intel_encoder,
 260                                                           PCH_GPIOE, "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(intel_encoder,
 265                                                           PCH_GPIOD, "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(intel_encoder,
 270                                                           PCH_GPIOF, "HDMID");
 271                 dev_priv->hotplug_supported_mask |= HDMID_HOTPLUG_INT_STATUS;
 272         }
 273         if (!intel_encoder->ddc_bus)
 274                 goto err_connector;
 275
 276         intel_hdmi->sdvox_reg = sdvox_reg;
 277
 278         drm_encoder_helper_add(&intel_encoder->base, &intel_hdmi_helper_funcs);
 279
 280         intel_connector_attach_encoder(intel_connector, intel_encoder);
 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_encoder_cleanup(&intel_encoder->base);
 296         drm_connector_cleanup(connector);
 297         kfree(intel_hdmi);
 298         kfree(intel_connector);
 299
 300         return;
 301 }