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