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 | SDVO_BORDER_ENABLE;
  58         if (adjusted_mode->flags & DRM_MODE_FLAG_PVSYNC)
  59                 sdvox |= SDVO_VSYNC_ACTIVE_HIGH;
  60         if (adjusted_mode->flags & DRM_MODE_FLAG_PHSYNC)
  61                 sdvox |= SDVO_HSYNC_ACTIVE_HIGH;
  62
  63         if (hdmi_priv->has_hdmi_sink) {
  64                 sdvox |= SDVO_AUDIO_ENABLE;
  65                 if (HAS_PCH_CPT(dev))
  66                         sdvox |= HDMI_MODE_SELECT;
  67         }
  68
  69         if (intel_crtc->pipe == 1) {
  70                 if (HAS_PCH_CPT(dev))
  71                         sdvox |= PORT_TRANS_B_SEL_CPT;
  72                 else
  73                         sdvox |= SDVO_PIPE_B_SELECT;
  74         }
  75
  76         I915_WRITE(hdmi_priv->sdvox_reg, sdvox);
  77         POSTING_READ(hdmi_priv->sdvox_reg);
  78 }
  79
  80 static void intel_hdmi_dpms(struct drm_encoder *encoder, int mode)
  81 {
  82         struct drm_device *dev = encoder->dev;
  83         struct drm_i915_private *dev_priv = dev->dev_private;
  84         struct intel_encoder *intel_encoder = enc_to_intel_encoder(encoder);
  85         struct intel_hdmi_priv *hdmi_priv = intel_encoder->dev_priv;
  86         u32 temp;
  87
  88         temp = I915_READ(hdmi_priv->sdvox_reg);
  89
  90         /* HW workaround, need to toggle enable bit off and on for 12bpc, but
  91          * we do this anyway which shows more stable in testing.
  92          */
  93         if (HAS_PCH_SPLIT(dev)) {
  94                 I915_WRITE(hdmi_priv->sdvox_reg, temp & ~SDVO_ENABLE);
  95                 POSTING_READ(hdmi_priv->sdvox_reg);
  96         }
  97
  98         if (mode != DRM_MODE_DPMS_ON) {
  99                 temp &= ~SDVO_ENABLE;
 100         } else {
 101                 temp |= SDVO_ENABLE;
 102         }
 103
 104         I915_WRITE(hdmi_priv->sdvox_reg, temp);
 105         POSTING_READ(hdmi_priv->sdvox_reg);
 106
 107         /* HW workaround, need to write this twice for issue that may result
 108          * in first write getting masked.
 109          */
 110         if (HAS_PCH_SPLIT(dev)) {
 111                 I915_WRITE(hdmi_priv->sdvox_reg, temp);
 112                 POSTING_READ(hdmi_priv->sdvox_reg);
 113         }
 114 }
 115
 116 static int intel_hdmi_mode_valid(struct drm_connector *connector,
 117                                  struct drm_display_mode *mode)
 118 {
 119         if (mode->clock > 165000)
 120                 return MODE_CLOCK_HIGH;
 121         if (mode->clock < 20000)
 122                 return MODE_CLOCK_HIGH;
 123
 124         if (mode->flags & DRM_MODE_FLAG_DBLSCAN)
 125                 return MODE_NO_DBLESCAN;
 126
 127         return MODE_OK;
 128 }
 129
 130 static bool intel_hdmi_mode_fixup(struct drm_encoder *encoder,
 131                                   struct drm_display_mode *mode,
 132                                   struct drm_display_mode *adjusted_mode)
 133 {
 134         return true;
 135 }
 136
 137 static enum drm_connector_status
 138 intel_hdmi_detect(struct drm_connector *connector)
 139 {
 140         struct drm_encoder *encoder = intel_attached_encoder(connector);
 141         struct intel_encoder *intel_encoder = enc_to_intel_encoder(encoder);
 142         struct intel_hdmi_priv *hdmi_priv = intel_encoder->dev_priv;
 143         struct edid *edid = NULL;
 144         enum drm_connector_status status = connector_status_disconnected;
 145
 146         hdmi_priv->has_hdmi_sink = false;
 147         edid = drm_get_edid(connector,
 148                             intel_encoder->ddc_bus);
 149
 150         if (edid) {
 151                 if (edid->input & DRM_EDID_INPUT_DIGITAL) {
 152                         status = connector_status_connected;
 153                         hdmi_priv->has_hdmi_sink = drm_detect_hdmi_monitor(edid);
 154                 }
 155                 connector->display_info.raw_edid = NULL;
 156                 kfree(edid);
 157         }
 158
 159         return status;
 160 }
 161
 162 static int intel_hdmi_get_modes(struct drm_connector *connector)
 163 {
 164         struct drm_encoder *encoder = intel_attached_encoder(connector);
 165         struct intel_encoder *intel_encoder = enc_to_intel_encoder(encoder);
 166
 167         /* We should parse the EDID data and find out if it's an HDMI sink so
 168          * we can send audio to it.
 169          */
 170
 171         return intel_ddc_get_modes(connector, intel_encoder->ddc_bus);
 172 }
 173
 174 static void intel_hdmi_destroy(struct drm_connector *connector)
 175 {
 176         drm_sysfs_connector_remove(connector);
 177         drm_connector_cleanup(connector);
 178         kfree(connector);
 179 }
 180
 181 static const struct drm_encoder_helper_funcs intel_hdmi_helper_funcs = {
 182         .dpms = intel_hdmi_dpms,
 183         .mode_fixup = intel_hdmi_mode_fixup,
 184         .prepare = intel_encoder_prepare,
 185         .mode_set = intel_hdmi_mode_set,
 186         .commit = intel_encoder_commit,
 187 };
 188
 189 static const struct drm_connector_funcs intel_hdmi_connector_funcs = {
 190         .dpms = drm_helper_connector_dpms,
 191         .detect = intel_hdmi_detect,
 192         .fill_modes = drm_helper_probe_single_connector_modes,
 193         .destroy = intel_hdmi_destroy,
 194 };
 195
 196 static const struct drm_connector_helper_funcs intel_hdmi_connector_helper_funcs = {
 197         .get_modes = intel_hdmi_get_modes,
 198         .mode_valid = intel_hdmi_mode_valid,
 199         .best_encoder = intel_attached_encoder,
 200 };
 201
 202 static void intel_hdmi_enc_destroy(struct drm_encoder *encoder)
 203 {
 204         struct intel_encoder *intel_encoder = enc_to_intel_encoder(encoder);
 205
 206         if (intel_encoder->i2c_bus)
 207                 intel_i2c_destroy(intel_encoder->i2c_bus);
 208         drm_encoder_cleanup(encoder);
 209         kfree(intel_encoder);
 210 }
 211
 212 static const struct drm_encoder_funcs intel_hdmi_enc_funcs = {
 213         .destroy = intel_hdmi_enc_destroy,
 214 };
 215
 216 void intel_hdmi_init(struct drm_device *dev, int sdvox_reg)
 217 {
 218         struct drm_i915_private *dev_priv = dev->dev_private;
 219         struct drm_connector *connector;
 220         struct intel_encoder *intel_encoder;
 221         struct intel_connector *intel_connector;
 222         struct intel_hdmi_priv *hdmi_priv;
 223
 224         intel_encoder = kcalloc(sizeof(struct intel_encoder) +
 225                                sizeof(struct intel_hdmi_priv), 1, GFP_KERNEL);
 226         if (!intel_encoder)
 227                 return;
 228
 229         intel_connector = kzalloc(sizeof(struct intel_connector), GFP_KERNEL);
 230         if (!intel_connector) {
 231                 kfree(intel_encoder);
 232                 return;
 233         }
 234
 235         hdmi_priv = (struct intel_hdmi_priv *)(intel_encoder + 1);
 236
 237         connector = &intel_connector->base;
 238         drm_connector_init(dev, connector, &intel_hdmi_connector_funcs,
 239                            DRM_MODE_CONNECTOR_HDMIA);
 240         drm_connector_helper_add(connector, &intel_hdmi_connector_helper_funcs);
 241
 242         intel_encoder->type = INTEL_OUTPUT_HDMI;
 243
 244         connector->polled = DRM_CONNECTOR_POLL_HPD;
 245         connector->interlace_allowed = 0;
 246         connector->doublescan_allowed = 0;
 247         intel_encoder->crtc_mask = (1 << 0) | (1 << 1);
 248
 249         /* Set up the DDC bus. */
 250         if (sdvox_reg == SDVOB) {
 251                 intel_encoder->clone_mask = (1 << INTEL_HDMIB_CLONE_BIT);
 252                 intel_encoder->ddc_bus = intel_i2c_create(dev, GPIOE, "HDMIB");
 253                 dev_priv->hotplug_supported_mask |= HDMIB_HOTPLUG_INT_STATUS;
 254         } else if (sdvox_reg == SDVOC) {
 255                 intel_encoder->clone_mask = (1 << INTEL_HDMIC_CLONE_BIT);
 256                 intel_encoder->ddc_bus = intel_i2c_create(dev, GPIOD, "HDMIC");
 257                 dev_priv->hotplug_supported_mask |= HDMIC_HOTPLUG_INT_STATUS;
 258         } else if (sdvox_reg == HDMIB) {
 259                 intel_encoder->clone_mask = (1 << INTEL_HDMID_CLONE_BIT);
 260                 intel_encoder->ddc_bus = intel_i2c_create(dev, PCH_GPIOE,
 261                                                                 "HDMIB");
 262                 dev_priv->hotplug_supported_mask |= HDMIB_HOTPLUG_INT_STATUS;
 263         } else if (sdvox_reg == HDMIC) {
 264                 intel_encoder->clone_mask = (1 << INTEL_HDMIE_CLONE_BIT);
 265                 intel_encoder->ddc_bus = intel_i2c_create(dev, PCH_GPIOD,
 266                                                                 "HDMIC");
 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_encoder->ddc_bus = intel_i2c_create(dev, PCH_GPIOF,
 271                                                                 "HDMID");
 272                 dev_priv->hotplug_supported_mask |= HDMID_HOTPLUG_INT_STATUS;
 273         }
 274         if (!intel_encoder->ddc_bus)
 275                 goto err_connector;
 276
 277         hdmi_priv->sdvox_reg = sdvox_reg;
 278         intel_encoder->dev_priv = hdmi_priv;
 279
 280         drm_encoder_init(dev, &intel_encoder->enc, &intel_hdmi_enc_funcs,
 281                          DRM_MODE_ENCODER_TMDS);
 282         drm_encoder_helper_add(&intel_encoder->enc, &intel_hdmi_helper_funcs);
 283
 284         drm_mode_connector_attach_encoder(&intel_connector->base,
 285                                           &intel_encoder->enc);
 286         drm_sysfs_connector_add(connector);
 287
 288         /* For G4X desktop chip, PEG_BAND_GAP_DATA 3:0 must first be written
 289          * 0xd.  Failure to do so will result in spurious interrupts being
 290          * generated on the port when a cable is not attached.
 291          */
 292         if (IS_G4X(dev) && !IS_GM45(dev)) {
 293                 u32 temp = I915_READ(PEG_BAND_GAP_DATA);
 294                 I915_WRITE(PEG_BAND_GAP_DATA, (temp & ~0xf) | 0xd);
 295         }
 296
 297         return;
 298
 299 err_connector:
 300         drm_connector_cleanup(connector);
 301         kfree(intel_encoder);
 302         kfree(intel_connector);
 303
 304         return;
 305 }