drivers/gpu/drm/i915/intel_crt.c

   1 /*
   2  * Copyright © 2006-2007 Intel Corporation
   3  *
   4  * Permission is hereby granted, free of charge, to any person obtaining a
   5  * copy of this software and associated documentation files (the "Software"),
   6  * to deal in the Software without restriction, including without limitation
   7  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
   8  * and/or sell copies of the Software, and to permit persons to whom the
   9  * Software is furnished to do so, subject to the following conditions:
  10  *
  11  * The above copyright notice and this permission notice (including the next
  12  * paragraph) shall be included in all copies or substantial portions of the
  13  * Software.
  14  *
  15  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  16  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  17  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  18  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  19  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
  20  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
  21  * DEALINGS IN THE SOFTWARE.
  22  *
  23  * Authors:
  24  *      Eric Anholt <eric@anholt.net>
  25  */
  26
  27 #include <linux/i2c.h>
  28 #include "drmP.h"
  29 #include "drm.h"
  30 #include "drm_crtc.h"
  31 #include "drm_crtc_helper.h"
  32 #include "intel_drv.h"
  33 #include "i915_drm.h"
  34 #include "i915_drv.h"
  35
  36 static void intel_crt_dpms(struct drm_encoder *encoder, int mode)
  37 {
  38         struct drm_device *dev = encoder->dev;
  39         struct drm_i915_private *dev_priv = dev->dev_private;
  40         u32 temp;
  41
  42         temp = I915_READ(ADPA);
  43         temp &= ~(ADPA_HSYNC_CNTL_DISABLE | ADPA_VSYNC_CNTL_DISABLE);
  44         temp |= ADPA_DAC_ENABLE;
  45
  46         switch(mode) {
  47         case DRM_MODE_DPMS_ON:
  48                 temp |= ADPA_DAC_ENABLE;
  49                 break;
  50         case DRM_MODE_DPMS_STANDBY:
  51                 temp |= ADPA_DAC_ENABLE | ADPA_HSYNC_CNTL_DISABLE;
  52                 break;
  53         case DRM_MODE_DPMS_SUSPEND:
  54                 temp |= ADPA_DAC_ENABLE | ADPA_VSYNC_CNTL_DISABLE;
  55                 break;
  56         case DRM_MODE_DPMS_OFF:
  57                 temp |= ADPA_HSYNC_CNTL_DISABLE | ADPA_VSYNC_CNTL_DISABLE;
  58                 break;
  59         }
  60
  61         I915_WRITE(ADPA, temp);
  62 }
  63
  64 static int intel_crt_mode_valid(struct drm_connector *connector,
  65                                 struct drm_display_mode *mode)
  66 {
  67         struct drm_device *dev = connector->dev;
  68
  69         int max_clock = 0;
  70         if (mode->flags & DRM_MODE_FLAG_DBLSCAN)
  71                 return MODE_NO_DBLESCAN;
  72
  73         if (mode->clock < 25000)
  74                 return MODE_CLOCK_LOW;
  75
  76         if (!IS_I9XX(dev))
  77                 max_clock = 350000;
  78         else
  79                 max_clock = 400000;
  80         if (mode->clock > max_clock)
  81                 return MODE_CLOCK_HIGH;
  82
  83         return MODE_OK;
  84 }
  85
  86 static bool intel_crt_mode_fixup(struct drm_encoder *encoder,
  87                                  struct drm_display_mode *mode,
  88                                  struct drm_display_mode *adjusted_mode)
  89 {
  90         return true;
  91 }
  92
  93 static void intel_crt_mode_set(struct drm_encoder *encoder,
  94                                struct drm_display_mode *mode,
  95                                struct drm_display_mode *adjusted_mode)
  96 {
  97
  98         struct drm_device *dev = encoder->dev;
  99         struct drm_crtc *crtc = encoder->crtc;
 100         struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
 101         struct drm_i915_private *dev_priv = dev->dev_private;
 102         int dpll_md_reg;
 103         u32 adpa, dpll_md;
 104
 105         if (intel_crtc->pipe == 0)
 106                 dpll_md_reg = DPLL_A_MD;
 107         else
 108                 dpll_md_reg = DPLL_B_MD;
 109
 110         /*
 111          * Disable separate mode multiplier used when cloning SDVO to CRT
 112          * XXX this needs to be adjusted when we really are cloning
 113          */
 114         if (IS_I965G(dev)) {
 115                 dpll_md = I915_READ(dpll_md_reg);
 116                 I915_WRITE(dpll_md_reg,
 117                            dpll_md & ~DPLL_MD_UDI_MULTIPLIER_MASK);
 118         }
 119
 120         adpa = 0;
 121         if (adjusted_mode->flags & DRM_MODE_FLAG_PHSYNC)
 122                 adpa |= ADPA_HSYNC_ACTIVE_HIGH;
 123         if (adjusted_mode->flags & DRM_MODE_FLAG_PVSYNC)
 124                 adpa |= ADPA_VSYNC_ACTIVE_HIGH;
 125
 126         if (intel_crtc->pipe == 0) {
 127                 adpa |= ADPA_PIPE_A_SELECT;
 128                 I915_WRITE(BCLRPAT_A, 0);
 129         } else {
 130                 adpa |= ADPA_PIPE_B_SELECT;
 131                 I915_WRITE(BCLRPAT_B, 0);
 132         }
 133
 134         I915_WRITE(ADPA, adpa);
 135 }
 136
 137 /**
 138  * Uses CRT_HOTPLUG_EN and CRT_HOTPLUG_STAT to detect CRT presence.
 139  *
 140  * Not for i915G/i915GM
 141  *
 142  * \return true if CRT is connected.
 143  * \return false if CRT is disconnected.
 144  */
 145 static bool intel_crt_detect_hotplug(struct drm_connector *connector)
 146 {
 147         struct drm_device *dev = connector->dev;
 148         struct drm_i915_private *dev_priv = dev->dev_private;
 149         u32 hotplug_en;
 150         int i, tries = 0;
 151         /*
 152          * On 4 series desktop, CRT detect sequence need to be done twice
 153          * to get a reliable result.
 154          */
 155
 156         if (IS_G4X(dev) && !IS_GM45(dev))
 157                 tries = 2;
 158         else
 159                 tries = 1;
 160         hotplug_en = I915_READ(PORT_HOTPLUG_EN);
 161         hotplug_en &= CRT_FORCE_HOTPLUG_MASK;
 162         hotplug_en |= CRT_HOTPLUG_FORCE_DETECT;
 163
 164         if (IS_GM45(dev))
 165                 hotplug_en |= CRT_HOTPLUG_ACTIVATION_PERIOD_64;
 166
 167         hotplug_en |= CRT_HOTPLUG_VOLTAGE_COMPARE_50;
 168
 169         for (i = 0; i < tries ; i++) {
 170                 unsigned long timeout;
 171                 /* turn on the FORCE_DETECT */
 172                 I915_WRITE(PORT_HOTPLUG_EN, hotplug_en);
 173                 timeout = jiffies + msecs_to_jiffies(1000);
 174                 /* wait for FORCE_DETECT to go off */
 175                 do {
 176                         if (!(I915_READ(PORT_HOTPLUG_EN) &
 177                                         CRT_HOTPLUG_FORCE_DETECT))
 178                                 break;
 179                         msleep(1);
 180                 } while (time_after(timeout, jiffies));
 181         }
 182
 183         if ((I915_READ(PORT_HOTPLUG_STAT) & CRT_HOTPLUG_MONITOR_MASK) ==
 184             CRT_HOTPLUG_MONITOR_COLOR)
 185                 return true;
 186
 187         return false;
 188 }
 189
 190 static bool intel_crt_detect_ddc(struct drm_connector *connector)
 191 {
 192         struct intel_output *intel_output = to_intel_output(connector);
 193
 194         /* CRT should always be at 0, but check anyway */
 195         if (intel_output->type != INTEL_OUTPUT_ANALOG)
 196                 return false;
 197
 198         return intel_ddc_probe(intel_output);
 199 }
 200
 201 static enum drm_connector_status intel_crt_detect(struct drm_connector *connector)
 202 {
 203         struct drm_device *dev = connector->dev;
 204
 205         if (IS_I9XX(dev) && !IS_I915G(dev) && !IS_I915GM(dev)) {
 206                 if (intel_crt_detect_hotplug(connector))
 207                         return connector_status_connected;
 208                 else
 209                         return connector_status_disconnected;
 210         }
 211
 212         if (intel_crt_detect_ddc(connector))
 213                 return connector_status_connected;
 214
 215         /* TODO use load detect */
 216         return connector_status_unknown;
 217 }
 218
 219 static void intel_crt_destroy(struct drm_connector *connector)
 220 {
 221         struct intel_output *intel_output = to_intel_output(connector);
 222
 223         intel_i2c_destroy(intel_output->ddc_bus);
 224         drm_sysfs_connector_remove(connector);
 225         drm_connector_cleanup(connector);
 226         kfree(connector);
 227 }
 228
 229 static int intel_crt_get_modes(struct drm_connector *connector)
 230 {
 231         struct intel_output *intel_output = to_intel_output(connector);
 232         return intel_ddc_get_modes(intel_output);
 233 }
 234
 235 static int intel_crt_set_property(struct drm_connector *connector,
 236                                   struct drm_property *property,
 237                                   uint64_t value)
 238 {
 239         struct drm_device *dev = connector->dev;
 240
 241         if (property == dev->mode_config.dpms_property && connector->encoder)
 242                 intel_crt_dpms(connector->encoder, (uint32_t)(value & 0xf));
 243
 244         return 0;
 245 }
 246
 247 /*
 248  * Routines for controlling stuff on the analog port
 249  */
 250
 251 static const struct drm_encoder_helper_funcs intel_crt_helper_funcs = {
 252         .dpms = intel_crt_dpms,
 253         .mode_fixup = intel_crt_mode_fixup,
 254         .prepare = intel_encoder_prepare,
 255         .commit = intel_encoder_commit,
 256         .mode_set = intel_crt_mode_set,
 257 };
 258
 259 static const struct drm_connector_funcs intel_crt_connector_funcs = {
 260         .detect = intel_crt_detect,
 261         .fill_modes = drm_helper_probe_single_connector_modes,
 262         .destroy = intel_crt_destroy,
 263         .set_property = intel_crt_set_property,
 264 };
 265
 266 static const struct drm_connector_helper_funcs intel_crt_connector_helper_funcs = {
 267         .mode_valid = intel_crt_mode_valid,
 268         .get_modes = intel_crt_get_modes,
 269         .best_encoder = intel_best_encoder,
 270 };
 271
 272 static void intel_crt_enc_destroy(struct drm_encoder *encoder)
 273 {
 274         drm_encoder_cleanup(encoder);
 275 }
 276
 277 static const struct drm_encoder_funcs intel_crt_enc_funcs = {
 278         .destroy = intel_crt_enc_destroy,
 279 };
 280
 281 void intel_crt_init(struct drm_device *dev)
 282 {
 283         struct drm_connector *connector;
 284         struct intel_output *intel_output;
 285
 286         intel_output = kzalloc(sizeof(struct intel_output), GFP_KERNEL);
 287         if (!intel_output)
 288                 return;
 289
 290         connector = &intel_output->base;
 291         drm_connector_init(dev, &intel_output->base,
 292                            &intel_crt_connector_funcs, DRM_MODE_CONNECTOR_VGA);
 293
 294         drm_encoder_init(dev, &intel_output->enc, &intel_crt_enc_funcs,
 295                          DRM_MODE_ENCODER_DAC);
 296
 297         drm_mode_connector_attach_encoder(&intel_output->base,
 298                                           &intel_output->enc);
 299
 300         /* Set up the DDC bus. */
 301         intel_output->ddc_bus = intel_i2c_create(dev, GPIOA, "CRTDDC_A");
 302         if (!intel_output->ddc_bus) {
 303                 dev_printk(KERN_ERR, &dev->pdev->dev, "DDC bus registration "
 304                            "failed.\n");
 305                 return;
 306         }
 307
 308         intel_output->type = INTEL_OUTPUT_ANALOG;
 309         connector->interlace_allowed = 0;
 310         connector->doublescan_allowed = 0;
 311
 312         drm_encoder_helper_add(&intel_output->enc, &intel_crt_helper_funcs);
 313         drm_connector_helper_add(connector, &intel_crt_connector_helper_funcs);
 314
 315         drm_sysfs_connector_add(connector);
 316 }