drivers/staging/gma500/cdv_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 <drm/drmP.h>
  29
  30 #include "intel_bios.h"
  31 #include "psb_drv.h"
  32 #include "psb_intel_drv.h"
  33 #include "psb_intel_reg.h"
  34 #include "power.h"
  35 #include <linux/pm_runtime.h>
  36
  37
  38 static void cdv_intel_crt_dpms(struct drm_encoder *encoder, int mode)
  39 {
  40         struct drm_device *dev = encoder->dev;
  41         u32 temp, reg;
  42         reg = ADPA;
  43
  44         temp = REG_READ(reg);
  45         temp &= ~(ADPA_HSYNC_CNTL_DISABLE | ADPA_VSYNC_CNTL_DISABLE);
  46         temp &= ~ADPA_DAC_ENABLE;
  47
  48         switch (mode) {
  49         case DRM_MODE_DPMS_ON:
  50                 temp |= ADPA_DAC_ENABLE;
  51                 break;
  52         case DRM_MODE_DPMS_STANDBY:
  53                 temp |= ADPA_DAC_ENABLE | ADPA_HSYNC_CNTL_DISABLE;
  54                 break;
  55         case DRM_MODE_DPMS_SUSPEND:
  56                 temp |= ADPA_DAC_ENABLE | ADPA_VSYNC_CNTL_DISABLE;
  57                 break;
  58         case DRM_MODE_DPMS_OFF:
  59                 temp |= ADPA_HSYNC_CNTL_DISABLE | ADPA_VSYNC_CNTL_DISABLE;
  60                 break;
  61         }
  62
  63         REG_WRITE(reg, temp);
  64 }
  65
  66 static int cdv_intel_crt_mode_valid(struct drm_connector *connector,
  67                                 struct drm_display_mode *mode)
  68 {
  69         int max_clock = 0;
  70         if (mode->flags & DRM_MODE_FLAG_DBLSCAN)
  71                 return MODE_NO_DBLESCAN;
  72
  73         /* The lowest clock for CDV is 20000KHz */
  74         if (mode->clock < 20000)
  75                 return MODE_CLOCK_LOW;
  76
  77         /* The max clock for CDV is 355 instead of 400 */
  78         max_clock = 355000;
  79         if (mode->clock > max_clock)
  80                 return MODE_CLOCK_HIGH;
  81
  82         if (mode->hdisplay > 1680 || mode->vdisplay > 1050)
  83                 return MODE_PANEL;
  84
  85         return MODE_OK;
  86 }
  87
  88 static bool cdv_intel_crt_mode_fixup(struct drm_encoder *encoder,
  89                                  struct drm_display_mode *mode,
  90                                  struct drm_display_mode *adjusted_mode)
  91 {
  92         return true;
  93 }
  94
  95 static void cdv_intel_crt_mode_set(struct drm_encoder *encoder,
  96                                struct drm_display_mode *mode,
  97                                struct drm_display_mode *adjusted_mode)
  98 {
  99
 100         struct drm_device *dev = encoder->dev;
 101         struct drm_crtc *crtc = encoder->crtc;
 102         struct psb_intel_crtc *psb_intel_crtc =
 103                                         to_psb_intel_crtc(crtc);
 104         int dpll_md_reg;
 105         u32 adpa, dpll_md;
 106         u32 adpa_reg;
 107
 108         if (psb_intel_crtc->pipe == 0)
 109                 dpll_md_reg = DPLL_A_MD;
 110         else
 111                 dpll_md_reg = DPLL_B_MD;
 112
 113         adpa_reg = ADPA;
 114
 115         /*
 116          * Disable separate mode multiplier used when cloning SDVO to CRT
 117          * XXX this needs to be adjusted when we really are cloning
 118          */
 119         {
 120                 dpll_md = REG_READ(dpll_md_reg);
 121                 REG_WRITE(dpll_md_reg,
 122                            dpll_md & ~DPLL_MD_UDI_MULTIPLIER_MASK);
 123         }
 124
 125         adpa = 0;
 126         if (adjusted_mode->flags & DRM_MODE_FLAG_PHSYNC)
 127                 adpa |= ADPA_HSYNC_ACTIVE_HIGH;
 128         if (adjusted_mode->flags & DRM_MODE_FLAG_PVSYNC)
 129                 adpa |= ADPA_VSYNC_ACTIVE_HIGH;
 130
 131         if (psb_intel_crtc->pipe == 0)
 132                 adpa |= ADPA_PIPE_A_SELECT;
 133         else
 134                 adpa |= ADPA_PIPE_B_SELECT;
 135
 136         REG_WRITE(adpa_reg, adpa);
 137 }
 138
 139
 140 /**
 141  * Uses CRT_HOTPLUG_EN and CRT_HOTPLUG_STAT to detect CRT presence.
 142  *
 143  * \return true if CRT is connected.
 144  * \return false if CRT is disconnected.
 145  */
 146 static bool cdv_intel_crt_detect_hotplug(struct drm_connector *connector,
 147                                                                 bool force)
 148 {
 149         struct drm_device *dev = connector->dev;
 150         u32 hotplug_en;
 151         int i, tries = 0, ret = false;
 152         u32 adpa_orig;
 153
 154         /* disable the DAC when doing the hotplug detection */
 155
 156         adpa_orig = REG_READ(ADPA);
 157
 158         REG_WRITE(ADPA, adpa_orig & ~(ADPA_DAC_ENABLE));
 159
 160         /*
 161          * On a CDV thep, CRT detect sequence need to be done twice
 162          * to get a reliable result.
 163          */
 164         tries = 2;
 165
 166         hotplug_en = REG_READ(PORT_HOTPLUG_EN);
 167         hotplug_en &= ~(CRT_HOTPLUG_DETECT_MASK);
 168         hotplug_en |= CRT_HOTPLUG_FORCE_DETECT;
 169
 170         hotplug_en |= CRT_HOTPLUG_ACTIVATION_PERIOD_64;
 171         hotplug_en |= CRT_HOTPLUG_VOLTAGE_COMPARE_50;
 172
 173         for (i = 0; i < tries ; i++) {
 174                 unsigned long timeout;
 175                 /* turn on the FORCE_DETECT */
 176                 REG_WRITE(PORT_HOTPLUG_EN, hotplug_en);
 177                 timeout = jiffies + msecs_to_jiffies(1000);
 178                 /* wait for FORCE_DETECT to go off */
 179                 do {
 180                         if (!(REG_READ(PORT_HOTPLUG_EN) &
 181                                         CRT_HOTPLUG_FORCE_DETECT))
 182                                 break;
 183                         msleep(1);
 184                 } while (time_after(timeout, jiffies));
 185         }
 186
 187         if ((REG_READ(PORT_HOTPLUG_STAT) & CRT_HOTPLUG_MONITOR_MASK) !=
 188             CRT_HOTPLUG_MONITOR_NONE)
 189                 ret = true;
 190
 191         /* Restore the saved ADPA */
 192         REG_WRITE(ADPA, adpa_orig);
 193         return ret;
 194 }
 195
 196 static enum drm_connector_status cdv_intel_crt_detect(
 197                                 struct drm_connector *connector, bool force)
 198 {
 199         if (cdv_intel_crt_detect_hotplug(connector, force))
 200                 return connector_status_connected;
 201         else
 202                 return connector_status_disconnected;
 203 }
 204
 205 static void cdv_intel_crt_destroy(struct drm_connector *connector)
 206 {
 207         struct psb_intel_output *intel_output = to_psb_intel_output(connector);
 208
 209         psb_intel_i2c_destroy(intel_output->ddc_bus);
 210         drm_sysfs_connector_remove(connector);
 211         drm_connector_cleanup(connector);
 212         kfree(connector);
 213 }
 214
 215 static int cdv_intel_crt_get_modes(struct drm_connector *connector)
 216 {
 217         struct psb_intel_output *intel_output =
 218                                 to_psb_intel_output(connector);
 219         return psb_intel_ddc_get_modes(intel_output);
 220 }
 221
 222 static int cdv_intel_crt_set_property(struct drm_connector *connector,
 223                                   struct drm_property *property,
 224                                   uint64_t value)
 225 {
 226         return 0;
 227 }
 228
 229 /*
 230  * Routines for controlling stuff on the analog port
 231  */
 232
 233 static const struct drm_encoder_helper_funcs cdv_intel_crt_helper_funcs = {
 234         .dpms = cdv_intel_crt_dpms,
 235         .mode_fixup = cdv_intel_crt_mode_fixup,
 236         .prepare = psb_intel_encoder_prepare,
 237         .commit = psb_intel_encoder_commit,
 238         .mode_set = cdv_intel_crt_mode_set,
 239 };
 240
 241 static const struct drm_connector_funcs cdv_intel_crt_connector_funcs = {
 242         .dpms = drm_helper_connector_dpms,
 243         .detect = cdv_intel_crt_detect,
 244         .fill_modes = drm_helper_probe_single_connector_modes,
 245         .destroy = cdv_intel_crt_destroy,
 246         .set_property = cdv_intel_crt_set_property,
 247 };
 248
 249 static const struct drm_connector_helper_funcs
 250                                 cdv_intel_crt_connector_helper_funcs = {
 251         .mode_valid = cdv_intel_crt_mode_valid,
 252         .get_modes = cdv_intel_crt_get_modes,
 253         .best_encoder = psb_intel_best_encoder,
 254 };
 255
 256 static void cdv_intel_crt_enc_destroy(struct drm_encoder *encoder)
 257 {
 258         drm_encoder_cleanup(encoder);
 259 }
 260
 261 static const struct drm_encoder_funcs cdv_intel_crt_enc_funcs = {
 262         .destroy = cdv_intel_crt_enc_destroy,
 263 };
 264
 265 void cdv_intel_crt_init(struct drm_device *dev,
 266                         struct psb_intel_mode_device *mode_dev)
 267 {
 268
 269         struct psb_intel_output *psb_intel_output;
 270         struct drm_connector *connector;
 271         struct drm_encoder *encoder;
 272
 273         u32 i2c_reg;
 274
 275         psb_intel_output = kzalloc(sizeof(struct psb_intel_output), GFP_KERNEL);
 276         if (!psb_intel_output)
 277                 return;
 278
 279         psb_intel_output->mode_dev = mode_dev;
 280         connector = &psb_intel_output->base;
 281         drm_connector_init(dev, connector,
 282                 &cdv_intel_crt_connector_funcs, DRM_MODE_CONNECTOR_VGA);
 283
 284         encoder = &psb_intel_output->enc;
 285         drm_encoder_init(dev, encoder,
 286                 &cdv_intel_crt_enc_funcs, DRM_MODE_ENCODER_DAC);
 287
 288         drm_mode_connector_attach_encoder(&psb_intel_output->base,
 289                                           &psb_intel_output->enc);
 290
 291         /* Set up the DDC bus. */
 292         i2c_reg = GPIOA;
 293         /* Remove the following code for CDV */
 294         /*
 295         if (dev_priv->crt_ddc_bus != 0)
 296                 i2c_reg = dev_priv->crt_ddc_bus;
 297         }*/
 298         psb_intel_output->ddc_bus = psb_intel_i2c_create(dev,
 299                                                 i2c_reg, "CRTDDC_A");
 300         if (!psb_intel_output->ddc_bus) {
 301                 dev_printk(KERN_ERR, &dev->pdev->dev, "DDC bus registration "
 302                            "failed.\n");
 303                 goto failed_ddc;
 304         }
 305
 306         psb_intel_output->type = INTEL_OUTPUT_ANALOG;
 307         /*
 308         psb_intel_output->clone_mask = (1 << INTEL_ANALOG_CLONE_BIT);
 309         psb_intel_output->crtc_mask = (1 << 0) | (1 << 1);
 310         */
 311         connector->interlace_allowed = 0;
 312         connector->doublescan_allowed = 0;
 313
 314         drm_encoder_helper_add(encoder, &cdv_intel_crt_helper_funcs);
 315         drm_connector_helper_add(connector,
 316                                         &cdv_intel_crt_connector_helper_funcs);
 317
 318         drm_sysfs_connector_add(connector);
 319
 320         return;
 321 failed_ddc:
 322         drm_encoder_cleanup(&psb_intel_output->enc);
 323         drm_connector_cleanup(&psb_intel_output->base);
 324         kfree(psb_intel_output);
 325         return;
 326 }