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 temp;
 150
 151         unsigned long timeout = jiffies + msecs_to_jiffies(1000);
 152
 153         temp = I915_READ(PORT_HOTPLUG_EN);
 154
 155         I915_WRITE(PORT_HOTPLUG_EN,
 156                    temp | CRT_HOTPLUG_FORCE_DETECT | (1 << 5));
 157
 158         do {
 159                 if (!(I915_READ(PORT_HOTPLUG_EN) & CRT_HOTPLUG_FORCE_DETECT))
 160                         break;
 161                 msleep(1);
 162         } while (time_after(timeout, jiffies));
 163
 164         if ((I915_READ(PORT_HOTPLUG_STAT) & CRT_HOTPLUG_MONITOR_MASK) ==
 165             CRT_HOTPLUG_MONITOR_COLOR)
 166                 return true;
 167
 168         return false;
 169 }
 170
 171 static bool intel_crt_detect_ddc(struct drm_connector *connector)
 172 {
 173         struct intel_output *intel_output = to_intel_output(connector);
 174
 175         /* CRT should always be at 0, but check anyway */
 176         if (intel_output->type != INTEL_OUTPUT_ANALOG)
 177                 return false;
 178
 179         return intel_ddc_probe(intel_output);
 180 }
 181
 182 static enum drm_connector_status intel_crt_detect(struct drm_connector *connector)
 183 {
 184         struct drm_device *dev = connector->dev;
 185
 186         if (IS_I9XX(dev) && !IS_I915G(dev) && !IS_I915GM(dev)) {
 187                 if (intel_crt_detect_hotplug(connector))
 188                         return connector_status_connected;
 189                 else
 190                         return connector_status_disconnected;
 191         }
 192
 193         if (intel_crt_detect_ddc(connector))
 194                 return connector_status_connected;
 195
 196         /* TODO use load detect */
 197         return connector_status_unknown;
 198 }
 199
 200 static void intel_crt_destroy(struct drm_connector *connector)
 201 {
 202         struct intel_output *intel_output = to_intel_output(connector);
 203
 204         intel_i2c_destroy(intel_output->ddc_bus);
 205         drm_sysfs_connector_remove(connector);
 206         drm_connector_cleanup(connector);
 207         kfree(connector);
 208 }
 209
 210 static int intel_crt_get_modes(struct drm_connector *connector)
 211 {
 212         struct intel_output *intel_output = to_intel_output(connector);
 213         return intel_ddc_get_modes(intel_output);
 214 }
 215
 216 static int intel_crt_set_property(struct drm_connector *connector,
 217                                   struct drm_property *property,
 218                                   uint64_t value)
 219 {
 220         struct drm_device *dev = connector->dev;
 221
 222         if (property == dev->mode_config.dpms_property && connector->encoder)
 223                 intel_crt_dpms(connector->encoder, (uint32_t)(value & 0xf));
 224
 225         return 0;
 226 }
 227
 228 /*
 229  * Routines for controlling stuff on the analog port
 230  */
 231
 232 static const struct drm_encoder_helper_funcs intel_crt_helper_funcs = {
 233         .dpms = intel_crt_dpms,
 234         .mode_fixup = intel_crt_mode_fixup,
 235         .prepare = intel_encoder_prepare,
 236         .commit = intel_encoder_commit,
 237         .mode_set = intel_crt_mode_set,
 238 };
 239
 240 static const struct drm_connector_funcs intel_crt_connector_funcs = {
 241         .detect = intel_crt_detect,
 242         .fill_modes = drm_helper_probe_single_connector_modes,
 243         .destroy = intel_crt_destroy,
 244         .set_property = intel_crt_set_property,
 245 };
 246
 247 static const struct drm_connector_helper_funcs intel_crt_connector_helper_funcs = {
 248         .mode_valid = intel_crt_mode_valid,
 249         .get_modes = intel_crt_get_modes,
 250         .best_encoder = intel_best_encoder,
 251 };
 252
 253 static void intel_crt_enc_destroy(struct drm_encoder *encoder)
 254 {
 255         drm_encoder_cleanup(encoder);
 256 }
 257
 258 static const struct drm_encoder_funcs intel_crt_enc_funcs = {
 259         .destroy = intel_crt_enc_destroy,
 260 };
 261
 262 void intel_crt_init(struct drm_device *dev)
 263 {
 264         struct drm_connector *connector;
 265         struct intel_output *intel_output;
 266
 267         intel_output = kzalloc(sizeof(struct intel_output), GFP_KERNEL);
 268         if (!intel_output)
 269                 return;
 270
 271         connector = &intel_output->base;
 272         drm_connector_init(dev, &intel_output->base,
 273                            &intel_crt_connector_funcs, DRM_MODE_CONNECTOR_VGA);
 274
 275         drm_encoder_init(dev, &intel_output->enc, &intel_crt_enc_funcs,
 276                          DRM_MODE_ENCODER_DAC);
 277
 278         drm_mode_connector_attach_encoder(&intel_output->base,
 279                                           &intel_output->enc);
 280
 281         /* Set up the DDC bus. */
 282         intel_output->ddc_bus = intel_i2c_create(dev, GPIOA, "CRTDDC_A");
 283         if (!intel_output->ddc_bus) {
 284                 dev_printk(KERN_ERR, &dev->pdev->dev, "DDC bus registration "
 285                            "failed.\n");
 286                 return;
 287         }
 288
 289         intel_output->type = INTEL_OUTPUT_ANALOG;
 290         connector->interlace_allowed = 0;
 291         connector->doublescan_allowed = 0;
 292
 293         drm_encoder_helper_add(&intel_output->enc, &intel_crt_helper_funcs);
 294         drm_connector_helper_add(connector, &intel_crt_connector_helper_funcs);
 295
 296         drm_sysfs_connector_add(connector);
 297 }