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 "intel_drv.h"
  35 #include "i915_drm.h"
  36 #include "i915_drv.h"
  37
  38 struct intel_hdmi_priv {
  39         u32 sdvox_reg;
  40         u32 save_SDVOX;
  41         int has_hdmi_sink;
  42 };
  43
  44 static void intel_hdmi_mode_set(struct drm_encoder *encoder,
  45                                 struct drm_display_mode *mode,
  46                                 struct drm_display_mode *adjusted_mode)
  47 {
  48         struct drm_device *dev = encoder->dev;
  49         struct drm_i915_private *dev_priv = dev->dev_private;
  50         struct drm_crtc *crtc = encoder->crtc;
  51         struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
  52         struct intel_output *intel_output = enc_to_intel_output(encoder);
  53         struct intel_hdmi_priv *hdmi_priv = intel_output->dev_priv;
  54         u32 sdvox;
  55
  56         sdvox = SDVO_ENCODING_HDMI |
  57                 SDVO_BORDER_ENABLE |
  58                 SDVO_VSYNC_ACTIVE_HIGH |
  59                 SDVO_HSYNC_ACTIVE_HIGH;
  60
  61         if (hdmi_priv->has_hdmi_sink)
  62                 sdvox |= SDVO_AUDIO_ENABLE;
  63
  64         if (intel_crtc->pipe == 1)
  65                 sdvox |= SDVO_PIPE_B_SELECT;
  66
  67         I915_WRITE(hdmi_priv->sdvox_reg, sdvox);
  68         POSTING_READ(hdmi_priv->sdvox_reg);
  69 }
  70
  71 static void intel_hdmi_dpms(struct drm_encoder *encoder, int mode)
  72 {
  73         struct drm_device *dev = encoder->dev;
  74         struct drm_i915_private *dev_priv = dev->dev_private;
  75         struct intel_output *intel_output = enc_to_intel_output(encoder);
  76         struct intel_hdmi_priv *hdmi_priv = intel_output->dev_priv;
  77         u32 temp;
  78
  79         if (mode != DRM_MODE_DPMS_ON) {
  80                 temp = I915_READ(hdmi_priv->sdvox_reg);
  81                 I915_WRITE(hdmi_priv->sdvox_reg, temp & ~SDVO_ENABLE);
  82         } else {
  83                 temp = I915_READ(hdmi_priv->sdvox_reg);
  84                 I915_WRITE(hdmi_priv->sdvox_reg, temp | SDVO_ENABLE);
  85         }
  86         POSTING_READ(hdmi_priv->sdvox_reg);
  87 }
  88
  89 static void intel_hdmi_save(struct drm_connector *connector)
  90 {
  91         struct drm_device *dev = connector->dev;
  92         struct drm_i915_private *dev_priv = dev->dev_private;
  93         struct intel_output *intel_output = to_intel_output(connector);
  94         struct intel_hdmi_priv *hdmi_priv = intel_output->dev_priv;
  95
  96         hdmi_priv->save_SDVOX = I915_READ(hdmi_priv->sdvox_reg);
  97 }
  98
  99 static void intel_hdmi_restore(struct drm_connector *connector)
 100 {
 101         struct drm_device *dev = connector->dev;
 102         struct drm_i915_private *dev_priv = dev->dev_private;
 103         struct intel_output *intel_output = to_intel_output(connector);
 104         struct intel_hdmi_priv *hdmi_priv = intel_output->dev_priv;
 105
 106         I915_WRITE(hdmi_priv->sdvox_reg, hdmi_priv->save_SDVOX);
 107         POSTING_READ(hdmi_priv->sdvox_reg);
 108 }
 109
 110 static int intel_hdmi_mode_valid(struct drm_connector *connector,
 111                                  struct drm_display_mode *mode)
 112 {
 113         if (mode->clock > 165000)
 114                 return MODE_CLOCK_HIGH;
 115         if (mode->clock < 20000)
 116                 return MODE_CLOCK_HIGH;
 117
 118         if (mode->flags & DRM_MODE_FLAG_DBLSCAN)
 119                 return MODE_NO_DBLESCAN;
 120
 121         return MODE_OK;
 122 }
 123
 124 static bool intel_hdmi_mode_fixup(struct drm_encoder *encoder,
 125                                   struct drm_display_mode *mode,
 126                                   struct drm_display_mode *adjusted_mode)
 127 {
 128         return true;
 129 }
 130
 131 static enum drm_connector_status
 132 intel_hdmi_detect(struct drm_connector *connector)
 133 {
 134         struct drm_device *dev = connector->dev;
 135         struct drm_i915_private *dev_priv = dev->dev_private;
 136         struct intel_output *intel_output = to_intel_output(connector);
 137         struct intel_hdmi_priv *hdmi_priv = intel_output->dev_priv;
 138         u32 temp, bit;
 139
 140         temp = I915_READ(PORT_HOTPLUG_EN);
 141
 142         I915_WRITE(PORT_HOTPLUG_EN,
 143                    temp |
 144                    HDMIB_HOTPLUG_INT_EN |
 145                    HDMIC_HOTPLUG_INT_EN |
 146                    HDMID_HOTPLUG_INT_EN);
 147
 148         POSTING_READ(PORT_HOTPLUG_EN);
 149
 150         switch (hdmi_priv->sdvox_reg) {
 151         case SDVOB:
 152                 bit = HDMIB_HOTPLUG_INT_STATUS;
 153                 break;
 154         case SDVOC:
 155                 bit = HDMIC_HOTPLUG_INT_STATUS;
 156                 break;
 157         default:
 158                 return connector_status_unknown;
 159         }
 160
 161         if ((I915_READ(PORT_HOTPLUG_STAT) & bit) != 0)
 162                 return connector_status_connected;
 163         else
 164                 return connector_status_disconnected;
 165 }
 166
 167 static int intel_hdmi_get_modes(struct drm_connector *connector)
 168 {
 169         struct intel_output *intel_output = to_intel_output(connector);
 170
 171         /* We should parse the EDID data and find out if it's an HDMI sink so
 172          * we can send audio to it.
 173          */
 174
 175         return intel_ddc_get_modes(intel_output);
 176 }
 177
 178 static void intel_hdmi_destroy(struct drm_connector *connector)
 179 {
 180         struct intel_output *intel_output = to_intel_output(connector);
 181
 182         if (intel_output->i2c_bus)
 183                 intel_i2c_destroy(intel_output->i2c_bus);
 184         drm_sysfs_connector_remove(connector);
 185         drm_connector_cleanup(connector);
 186         kfree(intel_output);
 187 }
 188
 189 static const struct drm_encoder_helper_funcs intel_hdmi_helper_funcs = {
 190         .dpms = intel_hdmi_dpms,
 191         .mode_fixup = intel_hdmi_mode_fixup,
 192         .prepare = intel_encoder_prepare,
 193         .mode_set = intel_hdmi_mode_set,
 194         .commit = intel_encoder_commit,
 195 };
 196
 197 static const struct drm_connector_funcs intel_hdmi_connector_funcs = {
 198         .save = intel_hdmi_save,
 199         .restore = intel_hdmi_restore,
 200         .detect = intel_hdmi_detect,
 201         .fill_modes = drm_helper_probe_single_connector_modes,
 202         .destroy = intel_hdmi_destroy,
 203 };
 204
 205 static const struct drm_connector_helper_funcs intel_hdmi_connector_helper_funcs = {
 206         .get_modes = intel_hdmi_get_modes,
 207         .mode_valid = intel_hdmi_mode_valid,
 208         .best_encoder = intel_best_encoder,
 209 };
 210
 211 static void intel_hdmi_enc_destroy(struct drm_encoder *encoder)
 212 {
 213         drm_encoder_cleanup(encoder);
 214 }
 215
 216 static const struct drm_encoder_funcs intel_hdmi_enc_funcs = {
 217         .destroy = intel_hdmi_enc_destroy,
 218 };
 219
 220
 221 void intel_hdmi_init(struct drm_device *dev, int sdvox_reg)
 222 {
 223         struct drm_i915_private *dev_priv = dev->dev_private;
 224         struct drm_connector *connector;
 225         struct intel_output *intel_output;
 226         struct intel_hdmi_priv *hdmi_priv;
 227
 228         intel_output = kcalloc(sizeof(struct intel_output) +
 229                                sizeof(struct intel_hdmi_priv), 1, GFP_KERNEL);
 230         if (!intel_output)
 231                 return;
 232         hdmi_priv = (struct intel_hdmi_priv *)(intel_output + 1);
 233
 234         connector = &intel_output->base;
 235         drm_connector_init(dev, connector, &intel_hdmi_connector_funcs,
 236                            DRM_MODE_CONNECTOR_DVID);
 237         drm_connector_helper_add(connector, &intel_hdmi_connector_helper_funcs);
 238
 239         intel_output->type = INTEL_OUTPUT_HDMI;
 240
 241         connector->interlace_allowed = 0;
 242         connector->doublescan_allowed = 0;
 243
 244         /* Set up the DDC bus. */
 245         if (sdvox_reg == SDVOB)
 246                 intel_output->ddc_bus = intel_i2c_create(dev, GPIOE, "HDMIB");
 247         else
 248                 intel_output->ddc_bus = intel_i2c_create(dev, GPIOD, "HDMIC");
 249
 250         if (!intel_output->ddc_bus)
 251                 goto err_connector;
 252
 253         hdmi_priv->sdvox_reg = sdvox_reg;
 254         intel_output->dev_priv = hdmi_priv;
 255
 256         drm_encoder_init(dev, &intel_output->enc, &intel_hdmi_enc_funcs,
 257                          DRM_MODE_ENCODER_TMDS);
 258         drm_encoder_helper_add(&intel_output->enc, &intel_hdmi_helper_funcs);
 259
 260         drm_mode_connector_attach_encoder(&intel_output->base,
 261                                           &intel_output->enc);
 262         drm_sysfs_connector_add(connector);
 263
 264         /* For G4X desktop chip, PEG_BAND_GAP_DATA 3:0 must first be written
 265          * 0xd.  Failure to do so will result in spurious interrupts being
 266          * generated on the port when a cable is not attached.
 267          */
 268         if (IS_G4X(dev) && !IS_GM45(dev)) {
 269                 u32 temp = I915_READ(PEG_BAND_GAP_DATA);
 270                 I915_WRITE(PEG_BAND_GAP_DATA, (temp & ~0xf) | 0xd);
 271         }
 272
 273         return;
 274
 275 err_connector:
 276         drm_connector_cleanup(connector);
 277         kfree(intel_output);
 278
 279         return;
 280 }