drivers/gpu/drm/gma500/oaktrail_lvds.c

   1 /*
   2  * Copyright © 2006-2009 Intel Corporation
   3  *
   4  * This program is free software; you can redistribute it and/or modify it
   5  * under the terms and conditions of the GNU General Public License,
   6  * version 2, as published by the Free Software Foundation.
   7  *
   8  * This program is distributed in the hope it will be useful, but WITHOUT
   9  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  10  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  11  * more details.
  12  *
  13  * You should have received a copy of the GNU General Public License along with
  14  * this program; if not, write to the Free Software Foundation, Inc.,
  15  * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
  16  *
  17  * Authors:
  18  *      Eric Anholt <eric@anholt.net>
  19  *      Dave Airlie <airlied@linux.ie>
  20  *      Jesse Barnes <jesse.barnes@intel.com>
  21  */
  22
  23 #include <linux/i2c.h>
  24 #include <drm/drmP.h>
  25 #include <asm/intel-mid.h>
  26
  27 #include "intel_bios.h"
  28 #include "psb_drv.h"
  29 #include "psb_intel_drv.h"
  30 #include "psb_intel_reg.h"
  31 #include "power.h"
  32 #include <linux/pm_runtime.h>
  33
  34 /* The max/min PWM frequency in BPCR[31:17] - */
  35 /* The smallest number is 1 (not 0) that can fit in the
  36  * 15-bit field of the and then*/
  37 /* shifts to the left by one bit to get the actual 16-bit
  38  * value that the 15-bits correspond to.*/
  39 #define MRST_BLC_MAX_PWM_REG_FREQ           0xFFFF
  40 #define BRIGHTNESS_MAX_LEVEL 100
  41
  42 /**
  43  * Sets the power state for the panel.
  44  */
  45 static void oaktrail_lvds_set_power(struct drm_device *dev,
  46                                 struct gma_encoder *gma_encoder,
  47                                 bool on)
  48 {
  49         u32 pp_status;
  50         struct drm_psb_private *dev_priv = dev->dev_private;
  51
  52         if (!gma_power_begin(dev, true))
  53                 return;
  54
  55         if (on) {
  56                 REG_WRITE(PP_CONTROL, REG_READ(PP_CONTROL) |
  57                           POWER_TARGET_ON);
  58                 do {
  59                         pp_status = REG_READ(PP_STATUS);
  60                 } while ((pp_status & (PP_ON | PP_READY)) == PP_READY);
  61                 dev_priv->is_lvds_on = true;
  62                 if (dev_priv->ops->lvds_bl_power)
  63                         dev_priv->ops->lvds_bl_power(dev, true);
  64         } else {
  65                 if (dev_priv->ops->lvds_bl_power)
  66                         dev_priv->ops->lvds_bl_power(dev, false);
  67                 REG_WRITE(PP_CONTROL, REG_READ(PP_CONTROL) &
  68                           ~POWER_TARGET_ON);
  69                 do {
  70                         pp_status = REG_READ(PP_STATUS);
  71                 } while (pp_status & PP_ON);
  72                 dev_priv->is_lvds_on = false;
  73                 pm_request_idle(&dev->pdev->dev);
  74         }
  75         gma_power_end(dev);
  76 }
  77
  78 static void oaktrail_lvds_dpms(struct drm_encoder *encoder, int mode)
  79 {
  80         struct drm_device *dev = encoder->dev;
  81         struct gma_encoder *gma_encoder = to_gma_encoder(encoder);
  82
  83         if (mode == DRM_MODE_DPMS_ON)
  84                 oaktrail_lvds_set_power(dev, gma_encoder, true);
  85         else
  86                 oaktrail_lvds_set_power(dev, gma_encoder, false);
  87
  88         /* XXX: We never power down the LVDS pairs. */
  89 }
  90
  91 static void oaktrail_lvds_mode_set(struct drm_encoder *encoder,
  92                                struct drm_display_mode *mode,
  93                                struct drm_display_mode *adjusted_mode)
  94 {
  95         struct drm_device *dev = encoder->dev;
  96         struct drm_psb_private *dev_priv = dev->dev_private;
  97         struct psb_intel_mode_device *mode_dev = &dev_priv->mode_dev;
  98         struct drm_mode_config *mode_config = &dev->mode_config;
  99         struct drm_connector *connector = NULL;
 100         struct drm_crtc *crtc = encoder->crtc;
 101         u32 lvds_port;
 102         uint64_t v = DRM_MODE_SCALE_FULLSCREEN;
 103
 104         if (!gma_power_begin(dev, true))
 105                 return;
 106
 107         /*
 108          * The LVDS pin pair will already have been turned on in the
 109          * psb_intel_crtc_mode_set since it has a large impact on the DPLL
 110          * settings.
 111          */
 112         lvds_port = (REG_READ(LVDS) &
 113                     (~LVDS_PIPEB_SELECT)) |
 114                     LVDS_PORT_EN |
 115                     LVDS_BORDER_EN;
 116
 117         /* If the firmware says dither on Moorestown, or the BIOS does
 118            on Oaktrail then enable dithering */
 119         if (mode_dev->panel_wants_dither || dev_priv->lvds_dither)
 120                 lvds_port |= MRST_PANEL_8TO6_DITHER_ENABLE;
 121
 122         REG_WRITE(LVDS, lvds_port);
 123
 124         /* Find the connector we're trying to set up */
 125         list_for_each_entry(connector, &mode_config->connector_list, head) {
 126                 if (!connector->encoder || connector->encoder->crtc != crtc)
 127                         continue;
 128         }
 129
 130         if (!connector) {
 131                 DRM_ERROR("Couldn't find connector when setting mode");
 132                 return;
 133         }
 134
 135         drm_object_property_get_value(
 136                 &connector->base,
 137                 dev->mode_config.scaling_mode_property,
 138                 &v);
 139
 140         if (v == DRM_MODE_SCALE_NO_SCALE)
 141                 REG_WRITE(PFIT_CONTROL, 0);
 142         else if (v == DRM_MODE_SCALE_ASPECT) {
 143                 if ((mode->vdisplay != adjusted_mode->crtc_vdisplay) ||
 144                     (mode->hdisplay != adjusted_mode->crtc_hdisplay)) {
 145                         if ((adjusted_mode->crtc_hdisplay * mode->vdisplay) ==
 146                             (mode->hdisplay * adjusted_mode->crtc_vdisplay))
 147                                 REG_WRITE(PFIT_CONTROL, PFIT_ENABLE);
 148                         else if ((adjusted_mode->crtc_hdisplay *
 149                                 mode->vdisplay) > (mode->hdisplay *
 150                                 adjusted_mode->crtc_vdisplay))
 151                                 REG_WRITE(PFIT_CONTROL, PFIT_ENABLE |
 152                                           PFIT_SCALING_MODE_PILLARBOX);
 153                         else
 154                                 REG_WRITE(PFIT_CONTROL, PFIT_ENABLE |
 155                                           PFIT_SCALING_MODE_LETTERBOX);
 156                 } else
 157                         REG_WRITE(PFIT_CONTROL, PFIT_ENABLE);
 158         } else /*(v == DRM_MODE_SCALE_FULLSCREEN)*/
 159                 REG_WRITE(PFIT_CONTROL, PFIT_ENABLE);
 160
 161         gma_power_end(dev);
 162 }
 163
 164 static void oaktrail_lvds_prepare(struct drm_encoder *encoder)
 165 {
 166         struct drm_device *dev = encoder->dev;
 167         struct drm_psb_private *dev_priv = dev->dev_private;
 168         struct gma_encoder *gma_encoder = to_gma_encoder(encoder);
 169         struct psb_intel_mode_device *mode_dev = &dev_priv->mode_dev;
 170
 171         if (!gma_power_begin(dev, true))
 172                 return;
 173
 174         mode_dev->saveBLC_PWM_CTL = REG_READ(BLC_PWM_CTL);
 175         mode_dev->backlight_duty_cycle = (mode_dev->saveBLC_PWM_CTL &
 176                                           BACKLIGHT_DUTY_CYCLE_MASK);
 177         oaktrail_lvds_set_power(dev, gma_encoder, false);
 178         gma_power_end(dev);
 179 }
 180
 181 static u32 oaktrail_lvds_get_max_backlight(struct drm_device *dev)
 182 {
 183         struct drm_psb_private *dev_priv = dev->dev_private;
 184         u32 ret;
 185
 186         if (gma_power_begin(dev, false)) {
 187                 ret = ((REG_READ(BLC_PWM_CTL) &
 188                           BACKLIGHT_MODULATION_FREQ_MASK) >>
 189                           BACKLIGHT_MODULATION_FREQ_SHIFT) * 2;
 190
 191                 gma_power_end(dev);
 192         } else
 193                 ret = ((dev_priv->regs.saveBLC_PWM_CTL &
 194                           BACKLIGHT_MODULATION_FREQ_MASK) >>
 195                           BACKLIGHT_MODULATION_FREQ_SHIFT) * 2;
 196
 197         return ret;
 198 }
 199
 200 static void oaktrail_lvds_commit(struct drm_encoder *encoder)
 201 {
 202         struct drm_device *dev = encoder->dev;
 203         struct drm_psb_private *dev_priv = dev->dev_private;
 204         struct gma_encoder *gma_encoder = to_gma_encoder(encoder);
 205         struct psb_intel_mode_device *mode_dev = &dev_priv->mode_dev;
 206
 207         if (mode_dev->backlight_duty_cycle == 0)
 208                 mode_dev->backlight_duty_cycle =
 209                                         oaktrail_lvds_get_max_backlight(dev);
 210         oaktrail_lvds_set_power(dev, gma_encoder, true);
 211 }
 212
 213 static const struct drm_encoder_helper_funcs oaktrail_lvds_helper_funcs = {
 214         .dpms = oaktrail_lvds_dpms,
 215         .mode_fixup = psb_intel_lvds_mode_fixup,
 216         .prepare = oaktrail_lvds_prepare,
 217         .mode_set = oaktrail_lvds_mode_set,
 218         .commit = oaktrail_lvds_commit,
 219 };
 220
 221 /* Returns the panel fixed mode from configuration. */
 222
 223 static void oaktrail_lvds_get_configuration_mode(struct drm_device *dev,
 224                                         struct psb_intel_mode_device *mode_dev)
 225 {
 226         struct drm_display_mode *mode = NULL;
 227         struct drm_psb_private *dev_priv = dev->dev_private;
 228         struct oaktrail_timing_info *ti = &dev_priv->gct_data.DTD;
 229
 230         mode_dev->panel_fixed_mode = NULL;
 231
 232         /* Use the firmware provided data on Moorestown */
 233         if (dev_priv->has_gct) {
 234                 mode = kzalloc(sizeof(*mode), GFP_KERNEL);
 235                 if (!mode)
 236                         return;
 237
 238                 mode->hdisplay = (ti->hactive_hi << 8) | ti->hactive_lo;
 239                 mode->vdisplay = (ti->vactive_hi << 8) | ti->vactive_lo;
 240                 mode->hsync_start = mode->hdisplay + \
 241                                 ((ti->hsync_offset_hi << 8) | \
 242                                 ti->hsync_offset_lo);
 243                 mode->hsync_end = mode->hsync_start + \
 244                                 ((ti->hsync_pulse_width_hi << 8) | \
 245                                 ti->hsync_pulse_width_lo);
 246                 mode->htotal = mode->hdisplay + ((ti->hblank_hi << 8) | \
 247                                                         ti->hblank_lo);
 248                 mode->vsync_start = \
 249                         mode->vdisplay + ((ti->vsync_offset_hi << 4) | \
 250                                                 ti->vsync_offset_lo);
 251                 mode->vsync_end = \
 252                         mode->vsync_start + ((ti->vsync_pulse_width_hi << 4) | \
 253                                                 ti->vsync_pulse_width_lo);
 254                 mode->vtotal = mode->vdisplay + \
 255                                 ((ti->vblank_hi << 8) | ti->vblank_lo);
 256                 mode->clock = ti->pixel_clock * 10;
 257 #if 0
 258                 pr_info("hdisplay is %d\n", mode->hdisplay);
 259                 pr_info("vdisplay is %d\n", mode->vdisplay);
 260                 pr_info("HSS is %d\n", mode->hsync_start);
 261                 pr_info("HSE is %d\n", mode->hsync_end);
 262                 pr_info("htotal is %d\n", mode->htotal);
 263                 pr_info("VSS is %d\n", mode->vsync_start);
 264                 pr_info("VSE is %d\n", mode->vsync_end);
 265                 pr_info("vtotal is %d\n", mode->vtotal);
 266                 pr_info("clock is %d\n", mode->clock);
 267 #endif
 268                 mode_dev->panel_fixed_mode = mode;
 269         }
 270
 271         /* Use the BIOS VBT mode if available */
 272         if (mode_dev->panel_fixed_mode == NULL && mode_dev->vbt_mode)
 273                 mode_dev->panel_fixed_mode = drm_mode_duplicate(dev,
 274                                                 mode_dev->vbt_mode);
 275
 276         /* Then try the LVDS VBT mode */
 277         if (mode_dev->panel_fixed_mode == NULL)
 278                 if (dev_priv->lfp_lvds_vbt_mode)
 279                         mode_dev->panel_fixed_mode =
 280                                 drm_mode_duplicate(dev,
 281                                         dev_priv->lfp_lvds_vbt_mode);
 282
 283         /* If we still got no mode then bail */
 284         if (mode_dev->panel_fixed_mode == NULL)
 285                 return;
 286
 287         drm_mode_set_name(mode_dev->panel_fixed_mode);
 288         drm_mode_set_crtcinfo(mode_dev->panel_fixed_mode, 0);
 289 }
 290
 291 /**
 292  * oaktrail_lvds_init - setup LVDS connectors on this device
 293  * @dev: drm device
 294  *
 295  * Create the connector, register the LVDS DDC bus, and try to figure out what
 296  * modes we can display on the LVDS panel (if present).
 297  */
 298 void oaktrail_lvds_init(struct drm_device *dev,
 299                     struct psb_intel_mode_device *mode_dev)
 300 {
 301         struct gma_encoder *gma_encoder;
 302         struct gma_connector *gma_connector;
 303         struct drm_connector *connector;
 304         struct drm_encoder *encoder;
 305         struct drm_psb_private *dev_priv = dev->dev_private;
 306         struct edid *edid;
 307         struct i2c_adapter *i2c_adap;
 308         struct drm_display_mode *scan;  /* *modes, *bios_mode; */
 309
 310         gma_encoder = kzalloc(sizeof(struct gma_encoder), GFP_KERNEL);
 311         if (!gma_encoder)
 312                 return;
 313
 314         gma_connector = kzalloc(sizeof(struct gma_connector), GFP_KERNEL);
 315         if (!gma_connector)
 316                 goto failed_connector;
 317
 318         connector = &gma_connector->base;
 319         encoder = &gma_encoder->base;
 320         dev_priv->is_lvds_on = true;
 321         drm_connector_init(dev, connector,
 322                            &psb_intel_lvds_connector_funcs,
 323                            DRM_MODE_CONNECTOR_LVDS);
 324
 325         drm_encoder_init(dev, encoder, &psb_intel_lvds_enc_funcs,
 326                          DRM_MODE_ENCODER_LVDS, NULL);
 327
 328         gma_connector_attach_encoder(gma_connector, gma_encoder);
 329         gma_encoder->type = INTEL_OUTPUT_LVDS;
 330
 331         drm_encoder_helper_add(encoder, &oaktrail_lvds_helper_funcs);
 332         drm_connector_helper_add(connector,
 333                                  &psb_intel_lvds_connector_helper_funcs);
 334         connector->display_info.subpixel_order = SubPixelHorizontalRGB;
 335         connector->interlace_allowed = false;
 336         connector->doublescan_allowed = false;
 337
 338         drm_object_attach_property(&connector->base,
 339                                         dev->mode_config.scaling_mode_property,
 340                                         DRM_MODE_SCALE_FULLSCREEN);
 341         drm_object_attach_property(&connector->base,
 342                                         dev_priv->backlight_property,
 343                                         BRIGHTNESS_MAX_LEVEL);
 344
 345         mode_dev->panel_wants_dither = false;
 346         if (dev_priv->has_gct)
 347                 mode_dev->panel_wants_dither = (dev_priv->gct_data.
 348                         Panel_Port_Control & MRST_PANEL_8TO6_DITHER_ENABLE);
 349         if (dev_priv->lvds_dither)
 350                 mode_dev->panel_wants_dither = 1;
 351
 352         /*
 353          * LVDS discovery:
 354          * 1) check for EDID on DDC
 355          * 2) check for VBT data
 356          * 3) check to see if LVDS is already on
 357          *    if none of the above, no panel
 358          * 4) make sure lid is open
 359          *    if closed, act like it's not there for now
 360          */
 361
 362         edid = NULL;
 363         mutex_lock(&dev->mode_config.mutex);
 364         i2c_adap = i2c_get_adapter(dev_priv->ops->i2c_bus);
 365         if (i2c_adap)
 366                 edid = drm_get_edid(connector, i2c_adap);
 367         if (edid == NULL && dev_priv->lpc_gpio_base) {
 368                 oaktrail_lvds_i2c_init(encoder);
 369                 if (gma_encoder->ddc_bus != NULL) {
 370                         i2c_adap = &gma_encoder->ddc_bus->adapter;
 371                         edid = drm_get_edid(connector, i2c_adap);
 372                 }
 373         }
 374         /*
 375          * Attempt to get the fixed panel mode from DDC.  Assume that the
 376          * preferred mode is the right one.
 377          */
 378         if (edid) {
 379                 drm_connector_update_edid_property(connector, edid);
 380                 drm_add_edid_modes(connector, edid);
 381                 kfree(edid);
 382
 383                 list_for_each_entry(scan, &connector->probed_modes, head) {
 384                         if (scan->type & DRM_MODE_TYPE_PREFERRED) {
 385                                 mode_dev->panel_fixed_mode =
 386                                     drm_mode_duplicate(dev, scan);
 387                                 goto out;       /* FIXME: check for quirks */
 388                         }
 389                 }
 390         } else
 391                 dev_err(dev->dev, "No ddc adapter available!\n");
 392         /*
 393          * If we didn't get EDID, try geting panel timing
 394          * from configuration data
 395          */
 396         oaktrail_lvds_get_configuration_mode(dev, mode_dev);
 397
 398         if (mode_dev->panel_fixed_mode) {
 399                 mode_dev->panel_fixed_mode->type |= DRM_MODE_TYPE_PREFERRED;
 400                 goto out;       /* FIXME: check for quirks */
 401         }
 402
 403         /* If we still don't have a mode after all that, give up. */
 404         if (!mode_dev->panel_fixed_mode) {
 405                 dev_err(dev->dev, "Found no modes on the lvds, ignoring the LVDS\n");
 406                 goto failed_find;
 407         }
 408
 409 out:
 410         mutex_unlock(&dev->mode_config.mutex);
 411
 412         drm_connector_register(connector);
 413         return;
 414
 415 failed_find:
 416         mutex_unlock(&dev->mode_config.mutex);
 417
 418         dev_dbg(dev->dev, "No LVDS modes found, disabling.\n");
 419         if (gma_encoder->ddc_bus) {
 420                 psb_intel_i2c_destroy(gma_encoder->ddc_bus);
 421                 gma_encoder->ddc_bus = NULL;
 422         }
 423
 424 /* failed_ddc: */
 425
 426         drm_encoder_cleanup(encoder);
 427         drm_connector_cleanup(connector);
 428         kfree(gma_connector);
 429 failed_connector:
 430         kfree(gma_encoder);
 431 }
 432