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         int ddc_bus;
  44         bool has_hdmi_sink;
  45 };
  46
  47 static struct intel_hdmi *enc_to_intel_hdmi(struct drm_encoder *encoder)
  48 {
  49         return container_of(encoder, struct intel_hdmi, base.base);
  50 }
  51
  52 static struct intel_hdmi *intel_attached_hdmi(struct drm_connector *connector)
  53 {
  54         return container_of(intel_attached_encoder(connector),
  55                             struct intel_hdmi, base);
  56 }
  57
  58 static void intel_hdmi_mode_set(struct drm_encoder *encoder,
  59                                 struct drm_display_mode *mode,
  60                                 struct drm_display_mode *adjusted_mode)
  61 {
  62         struct drm_device *dev = encoder->dev;
  63         struct drm_i915_private *dev_priv = dev->dev_private;
  64         struct drm_crtc *crtc = encoder->crtc;
  65         struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
  66         struct intel_hdmi *intel_hdmi = enc_to_intel_hdmi(encoder);
  67         u32 sdvox;
  68
  69         sdvox = SDVO_ENCODING_HDMI | SDVO_BORDER_ENABLE;
  70         if (adjusted_mode->flags & DRM_MODE_FLAG_PVSYNC)
  71                 sdvox |= SDVO_VSYNC_ACTIVE_HIGH;
  72         if (adjusted_mode->flags & DRM_MODE_FLAG_PHSYNC)
  73                 sdvox |= SDVO_HSYNC_ACTIVE_HIGH;
  74
  75         if (intel_hdmi->has_hdmi_sink) {
  76                 sdvox |= SDVO_AUDIO_ENABLE;
  77                 if (HAS_PCH_CPT(dev))
  78                         sdvox |= HDMI_MODE_SELECT;
  79         }
  80
  81         if (intel_crtc->pipe == 1) {
  82                 if (HAS_PCH_CPT(dev))
  83                         sdvox |= PORT_TRANS_B_SEL_CPT;
  84                 else
  85                         sdvox |= SDVO_PIPE_B_SELECT;
  86         }
  87
  88         I915_WRITE(intel_hdmi->sdvox_reg, sdvox);
  89         POSTING_READ(intel_hdmi->sdvox_reg);
  90 }
  91
  92 static void intel_hdmi_dpms(struct drm_encoder *encoder, int mode)
  93 {
  94         struct drm_device *dev = encoder->dev;
  95         struct drm_i915_private *dev_priv = dev->dev_private;
  96         struct intel_hdmi *intel_hdmi = enc_to_intel_hdmi(encoder);
  97         u32 temp;
  98
  99         temp = I915_READ(intel_hdmi->sdvox_reg);
 100
 101         /* HW workaround, need to toggle enable bit off and on for 12bpc, but
 102          * we do this anyway which shows more stable in testing.
 103          */
 104         if (HAS_PCH_SPLIT(dev)) {
 105                 I915_WRITE(intel_hdmi->sdvox_reg, temp & ~SDVO_ENABLE);
 106                 POSTING_READ(intel_hdmi->sdvox_reg);
 107         }
 108
 109         if (mode != DRM_MODE_DPMS_ON) {
 110                 temp &= ~SDVO_ENABLE;
 111         } else {
 112                 temp |= SDVO_ENABLE;
 113         }
 114
 115         I915_WRITE(intel_hdmi->sdvox_reg, temp);
 116         POSTING_READ(intel_hdmi->sdvox_reg);
 117
 118         /* HW workaround, need to write this twice for issue that may result
 119          * in first write getting masked.
 120          */
 121         if (HAS_PCH_SPLIT(dev)) {
 122                 I915_WRITE(intel_hdmi->sdvox_reg, temp);
 123                 POSTING_READ(intel_hdmi->sdvox_reg);
 124         }
 125 }
 126
 127 static int intel_hdmi_mode_valid(struct drm_connector *connector,
 128                                  struct drm_display_mode *mode)
 129 {
 130         if (mode->clock > 165000)
 131                 return MODE_CLOCK_HIGH;
 132         if (mode->clock < 20000)
 133                 return MODE_CLOCK_HIGH;
 134
 135         if (mode->flags & DRM_MODE_FLAG_DBLSCAN)
 136                 return MODE_NO_DBLESCAN;
 137
 138         return MODE_OK;
 139 }
 140
 141 static bool intel_hdmi_mode_fixup(struct drm_encoder *encoder,
 142                                   struct drm_display_mode *mode,
 143                                   struct drm_display_mode *adjusted_mode)
 144 {
 145         return true;
 146 }
 147
 148 static enum drm_connector_status
 149 intel_hdmi_detect(struct drm_connector *connector, bool force)
 150 {
 151         struct intel_hdmi *intel_hdmi = intel_attached_hdmi(connector);
 152         struct drm_i915_private *dev_priv = connector->dev->dev_private;
 153         struct edid *edid;
 154         enum drm_connector_status status = connector_status_disconnected;
 155
 156         intel_hdmi->has_hdmi_sink = false;
 157         edid = drm_get_edid(connector,
 158                             &dev_priv->gmbus[intel_hdmi->ddc_bus].adapter);
 159
 160         if (edid) {
 161                 if (edid->input & DRM_EDID_INPUT_DIGITAL) {
 162                         status = connector_status_connected;
 163                         intel_hdmi->has_hdmi_sink = drm_detect_hdmi_monitor(edid);
 164                 }
 165                 connector->display_info.raw_edid = NULL;
 166                 kfree(edid);
 167         }
 168
 169         return status;
 170 }
 171
 172 static int intel_hdmi_get_modes(struct drm_connector *connector)
 173 {
 174         struct intel_hdmi *intel_hdmi = intel_attached_hdmi(connector);
 175         struct drm_i915_private *dev_priv = connector->dev->dev_private;
 176
 177         /* We should parse the EDID data and find out if it's an HDMI sink so
 178          * we can send audio to it.
 179          */
 180
 181         return intel_ddc_get_modes(connector,
 182                                    &dev_priv->gmbus[intel_hdmi->ddc_bus].adapter);
 183 }
 184
 185 static void intel_hdmi_destroy(struct drm_connector *connector)
 186 {
 187         drm_sysfs_connector_remove(connector);
 188         drm_connector_cleanup(connector);
 189         kfree(connector);
 190 }
 191
 192 static const struct drm_encoder_helper_funcs intel_hdmi_helper_funcs = {
 193         .dpms = intel_hdmi_dpms,
 194         .mode_fixup = intel_hdmi_mode_fixup,
 195         .prepare = intel_encoder_prepare,
 196         .mode_set = intel_hdmi_mode_set,
 197         .commit = intel_encoder_commit,
 198 };
 199
 200 static const struct drm_connector_funcs intel_hdmi_connector_funcs = {
 201         .dpms = drm_helper_connector_dpms,
 202         .detect = intel_hdmi_detect,
 203         .fill_modes = drm_helper_probe_single_connector_modes,
 204         .destroy = intel_hdmi_destroy,
 205 };
 206
 207 static const struct drm_connector_helper_funcs intel_hdmi_connector_helper_funcs = {
 208         .get_modes = intel_hdmi_get_modes,
 209         .mode_valid = intel_hdmi_mode_valid,
 210         .best_encoder = intel_best_encoder,
 211 };
 212
 213 static const struct drm_encoder_funcs intel_hdmi_enc_funcs = {
 214         .destroy = intel_encoder_destroy,
 215 };
 216
 217 void intel_hdmi_init(struct drm_device *dev, int sdvox_reg)
 218 {
 219         struct drm_i915_private *dev_priv = dev->dev_private;
 220         struct drm_connector *connector;
 221         struct intel_encoder *intel_encoder;
 222         struct intel_connector *intel_connector;
 223         struct intel_hdmi *intel_hdmi;
 224
 225         intel_hdmi = kzalloc(sizeof(struct intel_hdmi), GFP_KERNEL);
 226         if (!intel_hdmi)
 227                 return;
 228
 229         intel_connector = kzalloc(sizeof(struct intel_connector), GFP_KERNEL);
 230         if (!intel_connector) {
 231                 kfree(intel_hdmi);
 232                 return;
 233         }
 234
 235         intel_encoder = &intel_hdmi->base;
 236         drm_encoder_init(dev, &intel_encoder->base, &intel_hdmi_enc_funcs,
 237                          DRM_MODE_ENCODER_TMDS);
 238
 239         connector = &intel_connector->base;
 240         drm_connector_init(dev, connector, &intel_hdmi_connector_funcs,
 241                            DRM_MODE_CONNECTOR_HDMIA);
 242         drm_connector_helper_add(connector, &intel_hdmi_connector_helper_funcs);
 243
 244         intel_encoder->type = INTEL_OUTPUT_HDMI;
 245
 246         connector->polled = DRM_CONNECTOR_POLL_HPD;
 247         connector->interlace_allowed = 0;
 248         connector->doublescan_allowed = 0;
 249         intel_encoder->crtc_mask = (1 << 0) | (1 << 1);
 250
 251         /* Set up the DDC bus. */
 252         if (sdvox_reg == SDVOB) {
 253                 intel_encoder->clone_mask = (1 << INTEL_HDMIB_CLONE_BIT);
 254                 intel_hdmi->ddc_bus = GMBUS_PORT_DPB;
 255                 dev_priv->hotplug_supported_mask |= HDMIB_HOTPLUG_INT_STATUS;
 256         } else if (sdvox_reg == SDVOC) {
 257                 intel_encoder->clone_mask = (1 << INTEL_HDMIC_CLONE_BIT);
 258                 intel_hdmi->ddc_bus = GMBUS_PORT_DPC;
 259                 dev_priv->hotplug_supported_mask |= HDMIC_HOTPLUG_INT_STATUS;
 260         } else if (sdvox_reg == HDMIB) {
 261                 intel_encoder->clone_mask = (1 << INTEL_HDMID_CLONE_BIT);
 262                 intel_hdmi->ddc_bus = GMBUS_PORT_DPB;
 263                 dev_priv->hotplug_supported_mask |= HDMIB_HOTPLUG_INT_STATUS;
 264         } else if (sdvox_reg == HDMIC) {
 265                 intel_encoder->clone_mask = (1 << INTEL_HDMIE_CLONE_BIT);
 266                 intel_hdmi->ddc_bus = GMBUS_PORT_DPC;
 267                 dev_priv->hotplug_supported_mask |= HDMIC_HOTPLUG_INT_STATUS;
 268         } else if (sdvox_reg == HDMID) {
 269                 intel_encoder->clone_mask = (1 << INTEL_HDMIF_CLONE_BIT);
 270                 intel_hdmi->ddc_bus = GMBUS_PORT_DPD;
 271                 dev_priv->hotplug_supported_mask |= HDMID_HOTPLUG_INT_STATUS;
 272         }
 273
 274         intel_hdmi->sdvox_reg = sdvox_reg;
 275
 276         drm_encoder_helper_add(&intel_encoder->base, &intel_hdmi_helper_funcs);
 277
 278         intel_connector_attach_encoder(intel_connector, intel_encoder);
 279         drm_sysfs_connector_add(connector);
 280
 281         /* For G4X desktop chip, PEG_BAND_GAP_DATA 3:0 must first be written
 282          * 0xd.  Failure to do so will result in spurious interrupts being
 283          * generated on the port when a cable is not attached.
 284          */
 285         if (IS_G4X(dev) && !IS_GM45(dev)) {
 286                 u32 temp = I915_READ(PEG_BAND_GAP_DATA);
 287                 I915_WRITE(PEG_BAND_GAP_DATA, (temp & ~0xf) | 0xd);
 288         }
 289 }