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/mrst.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 psb_intel_encoder *psb_intel_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 psb_intel_encoder *psb_intel_encoder =
  82                                                 to_psb_intel_encoder(encoder);
  83
  84         if (mode == DRM_MODE_DPMS_ON)
  85                 oaktrail_lvds_set_power(dev, psb_intel_encoder, true);
  86         else
  87                 oaktrail_lvds_set_power(dev, psb_intel_encoder, false);
  88
  89         /* XXX: We never power down the LVDS pairs. */
  90 }
  91
  92 static void oaktrail_lvds_mode_set(struct drm_encoder *encoder,
  93                                struct drm_display_mode *mode,
  94                                struct drm_display_mode *adjusted_mode)
  95 {
  96         struct drm_device *dev = encoder->dev;
  97         struct drm_psb_private *dev_priv = dev->dev_private;
  98         struct psb_intel_mode_device *mode_dev = &dev_priv->mode_dev;
  99         struct drm_mode_config *mode_config = &dev->mode_config;
 100         struct drm_connector *connector = NULL;
 101         struct drm_crtc *crtc = encoder->crtc;
 102         u32 lvds_port;
 103         uint64_t v = DRM_MODE_SCALE_FULLSCREEN;
 104
 105         if (!gma_power_begin(dev, true))
 106                 return;
 107
 108         /*
 109          * The LVDS pin pair will already have been turned on in the
 110          * psb_intel_crtc_mode_set since it has a large impact on the DPLL
 111          * settings.
 112          */
 113         lvds_port = (REG_READ(LVDS) &
 114                     (~LVDS_PIPEB_SELECT)) |
 115                     LVDS_PORT_EN |
 116                     LVDS_BORDER_EN;
 117
 118         /* If the firmware says dither on Moorestown, or the BIOS does
 119            on Oaktrail then enable dithering */
 120         if (mode_dev->panel_wants_dither || dev_priv->lvds_dither)
 121                 lvds_port |= MRST_PANEL_8TO6_DITHER_ENABLE;
 122
 123         REG_WRITE(LVDS, lvds_port);
 124
 125         /* Find the connector we're trying to set up */
 126         list_for_each_entry(connector, &mode_config->connector_list, head) {
 127                 if (!connector->encoder || connector->encoder->crtc != crtc)
 128                         continue;
 129         }
 130
 131         if (!connector) {
 132                 DRM_ERROR("Couldn't find connector when setting mode");
 133                 return;
 134         }
 135
 136         drm_connector_property_get_value(
 137                 connector,
 138                 dev->mode_config.scaling_mode_property,
 139                 &v);
 140
 141         if (v == DRM_MODE_SCALE_NO_SCALE)
 142                 REG_WRITE(PFIT_CONTROL, 0);
 143         else if (v == DRM_MODE_SCALE_ASPECT) {
 144                 if ((mode->vdisplay != adjusted_mode->crtc_vdisplay) ||
 145                     (mode->hdisplay != adjusted_mode->crtc_hdisplay)) {
 146                         if ((adjusted_mode->crtc_hdisplay * mode->vdisplay) ==
 147                             (mode->hdisplay * adjusted_mode->crtc_vdisplay))
 148                                 REG_WRITE(PFIT_CONTROL, PFIT_ENABLE);
 149                         else if ((adjusted_mode->crtc_hdisplay *
 150                                 mode->vdisplay) > (mode->hdisplay *
 151                                 adjusted_mode->crtc_vdisplay))
 152                                 REG_WRITE(PFIT_CONTROL, PFIT_ENABLE |
 153                                           PFIT_SCALING_MODE_PILLARBOX);
 154                         else
 155                                 REG_WRITE(PFIT_CONTROL, PFIT_ENABLE |
 156                                           PFIT_SCALING_MODE_LETTERBOX);
 157                 } else
 158                         REG_WRITE(PFIT_CONTROL, PFIT_ENABLE);
 159         } else /*(v == DRM_MODE_SCALE_FULLSCREEN)*/
 160                 REG_WRITE(PFIT_CONTROL, PFIT_ENABLE);
 161
 162         gma_power_end(dev);
 163 }
 164
 165 static void oaktrail_lvds_prepare(struct drm_encoder *encoder)
 166 {
 167         struct drm_device *dev = encoder->dev;
 168         struct drm_psb_private *dev_priv = dev->dev_private;
 169         struct psb_intel_encoder *psb_intel_encoder =
 170                                                 to_psb_intel_encoder(encoder);
 171         struct psb_intel_mode_device *mode_dev = &dev_priv->mode_dev;
 172
 173         if (!gma_power_begin(dev, true))
 174                 return;
 175
 176         mode_dev->saveBLC_PWM_CTL = REG_READ(BLC_PWM_CTL);
 177         mode_dev->backlight_duty_cycle = (mode_dev->saveBLC_PWM_CTL &
 178                                           BACKLIGHT_DUTY_CYCLE_MASK);
 179         oaktrail_lvds_set_power(dev, psb_intel_encoder, false);
 180         gma_power_end(dev);
 181 }
 182
 183 static u32 oaktrail_lvds_get_max_backlight(struct drm_device *dev)
 184 {
 185         struct drm_psb_private *dev_priv = dev->dev_private;
 186         u32 ret;
 187
 188         if (gma_power_begin(dev, false)) {
 189                 ret = ((REG_READ(BLC_PWM_CTL) &
 190                           BACKLIGHT_MODULATION_FREQ_MASK) >>
 191                           BACKLIGHT_MODULATION_FREQ_SHIFT) * 2;
 192
 193                 gma_power_end(dev);
 194         } else
 195                 ret = ((dev_priv->saveBLC_PWM_CTL &
 196                           BACKLIGHT_MODULATION_FREQ_MASK) >>
 197                           BACKLIGHT_MODULATION_FREQ_SHIFT) * 2;
 198
 199         return ret;
 200 }
 201
 202 static void oaktrail_lvds_commit(struct drm_encoder *encoder)
 203 {
 204         struct drm_device *dev = encoder->dev;
 205         struct drm_psb_private *dev_priv = dev->dev_private;
 206         struct psb_intel_encoder *psb_intel_encoder =
 207                                                 to_psb_intel_encoder(encoder);
 208         struct psb_intel_mode_device *mode_dev = &dev_priv->mode_dev;
 209
 210         if (mode_dev->backlight_duty_cycle == 0)
 211                 mode_dev->backlight_duty_cycle =
 212                                         oaktrail_lvds_get_max_backlight(dev);
 213         oaktrail_lvds_set_power(dev, psb_intel_encoder, true);
 214 }
 215
 216 static const struct drm_encoder_helper_funcs oaktrail_lvds_helper_funcs = {
 217         .dpms = oaktrail_lvds_dpms,
 218         .mode_fixup = psb_intel_lvds_mode_fixup,
 219         .prepare = oaktrail_lvds_prepare,
 220         .mode_set = oaktrail_lvds_mode_set,
 221         .commit = oaktrail_lvds_commit,
 222 };
 223
 224 static struct drm_display_mode lvds_configuration_modes[] = {
 225         /* hard coded fixed mode for TPO LTPS LPJ040K001A */
 226         { DRM_MODE("800x480",  DRM_MODE_TYPE_DRIVER, 33264, 800, 836,
 227                    846, 1056, 0, 480, 489, 491, 525, 0, 0) },
 228         /* hard coded fixed mode for LVDS 800x480 */
 229         { DRM_MODE("800x480",  DRM_MODE_TYPE_DRIVER, 30994, 800, 801,
 230                    802, 1024, 0, 480, 481, 482, 525, 0, 0) },
 231         /* hard coded fixed mode for Samsung 480wsvga LVDS 1024x600@75 */
 232         { DRM_MODE("1024x600", DRM_MODE_TYPE_DRIVER, 53990, 1024, 1072,
 233                    1104, 1184, 0, 600, 603, 604, 608, 0, 0) },
 234         /* hard coded fixed mode for Samsung 480wsvga LVDS 1024x600@75 */
 235         { DRM_MODE("1024x600", DRM_MODE_TYPE_DRIVER, 53990, 1024, 1104,
 236                    1136, 1184, 0, 600, 603, 604, 608, 0, 0) },
 237         /* hard coded fixed mode for Sharp wsvga LVDS 1024x600 */
 238         { DRM_MODE("1024x600", DRM_MODE_TYPE_DRIVER, 48885, 1024, 1124,
 239                    1204, 1312, 0, 600, 607, 610, 621, 0, 0) },
 240         /* hard coded fixed mode for LVDS 1024x768 */
 241         { DRM_MODE("1024x768", DRM_MODE_TYPE_DRIVER, 65000, 1024, 1048,
 242                    1184, 1344, 0, 768, 771, 777, 806, 0, 0) },
 243         /* hard coded fixed mode for LVDS 1366x768 */
 244         { DRM_MODE("1366x768", DRM_MODE_TYPE_DRIVER, 77500, 1366, 1430,
 245                    1558, 1664, 0, 768, 769, 770, 776, 0, 0) },
 246 };
 247
 248 /* Returns the panel fixed mode from configuration. */
 249
 250 static void oaktrail_lvds_get_configuration_mode(struct drm_device *dev,
 251                                         struct psb_intel_mode_device *mode_dev)
 252 {
 253         struct drm_display_mode *mode = NULL;
 254         struct drm_psb_private *dev_priv = dev->dev_private;
 255         struct oaktrail_timing_info *ti = &dev_priv->gct_data.DTD;
 256
 257         mode_dev->panel_fixed_mode = NULL;
 258
 259         /* Use the firmware provided data on Moorestown */
 260         if (dev_priv->vbt_data.size != 0x00) { /*if non-zero, then use vbt*/
 261                 mode = kzalloc(sizeof(*mode), GFP_KERNEL);
 262                 if (!mode)
 263                         return;
 264
 265                 mode->hdisplay = (ti->hactive_hi << 8) | ti->hactive_lo;
 266                 mode->vdisplay = (ti->vactive_hi << 8) | ti->vactive_lo;
 267                 mode->hsync_start = mode->hdisplay + \
 268                                 ((ti->hsync_offset_hi << 8) | \
 269                                 ti->hsync_offset_lo);
 270                 mode->hsync_end = mode->hsync_start + \
 271                                 ((ti->hsync_pulse_width_hi << 8) | \
 272                                 ti->hsync_pulse_width_lo);
 273                 mode->htotal = mode->hdisplay + ((ti->hblank_hi << 8) | \
 274                                                         ti->hblank_lo);
 275                 mode->vsync_start = \
 276                         mode->vdisplay + ((ti->vsync_offset_hi << 4) | \
 277                                                 ti->vsync_offset_lo);
 278                 mode->vsync_end = \
 279                         mode->vsync_start + ((ti->vsync_pulse_width_hi << 4) | \
 280                                                 ti->vsync_pulse_width_lo);
 281                 mode->vtotal = mode->vdisplay + \
 282                                 ((ti->vblank_hi << 8) | ti->vblank_lo);
 283                 mode->clock = ti->pixel_clock * 10;
 284 #if 0
 285                 printk(KERN_INFO "hdisplay is %d\n", mode->hdisplay);
 286                 printk(KERN_INFO "vdisplay is %d\n", mode->vdisplay);
 287                 printk(KERN_INFO "HSS is %d\n", mode->hsync_start);
 288                 printk(KERN_INFO "HSE is %d\n", mode->hsync_end);
 289                 printk(KERN_INFO "htotal is %d\n", mode->htotal);
 290                 printk(KERN_INFO "VSS is %d\n", mode->vsync_start);
 291                 printk(KERN_INFO "VSE is %d\n", mode->vsync_end);
 292                 printk(KERN_INFO "vtotal is %d\n", mode->vtotal);
 293                 printk(KERN_INFO "clock is %d\n", mode->clock);
 294 #endif
 295                 mode_dev->panel_fixed_mode = mode;
 296         }
 297
 298         /* Use the BIOS VBT mode if available */
 299         if (mode_dev->panel_fixed_mode == NULL && mode_dev->vbt_mode)
 300                 mode_dev->panel_fixed_mode = drm_mode_duplicate(dev,
 301                                                 mode_dev->vbt_mode);
 302
 303         /* Then try the LVDS VBT mode */
 304         if (mode_dev->panel_fixed_mode == NULL)
 305                 if (dev_priv->lfp_lvds_vbt_mode)
 306                         mode_dev->panel_fixed_mode =
 307                                 drm_mode_duplicate(dev,
 308                                         dev_priv->lfp_lvds_vbt_mode);
 309         /* Then guess */
 310         if (mode_dev->panel_fixed_mode == NULL)
 311                 mode_dev->panel_fixed_mode
 312                         = drm_mode_duplicate(dev, &lvds_configuration_modes[2]);
 313
 314         drm_mode_set_name(mode_dev->panel_fixed_mode);
 315         drm_mode_set_crtcinfo(mode_dev->panel_fixed_mode, 0);
 316 }
 317
 318 /**
 319  * oaktrail_lvds_init - setup LVDS connectors on this device
 320  * @dev: drm device
 321  *
 322  * Create the connector, register the LVDS DDC bus, and try to figure out what
 323  * modes we can display on the LVDS panel (if present).
 324  */
 325 void oaktrail_lvds_init(struct drm_device *dev,
 326                     struct psb_intel_mode_device *mode_dev)
 327 {
 328         struct psb_intel_encoder *psb_intel_encoder;
 329         struct psb_intel_connector *psb_intel_connector;
 330         struct drm_connector *connector;
 331         struct drm_encoder *encoder;
 332         struct drm_psb_private *dev_priv = dev->dev_private;
 333         struct edid *edid;
 334         int ret = 0;
 335         struct i2c_adapter *i2c_adap;
 336         struct drm_display_mode *scan;  /* *modes, *bios_mode; */
 337
 338         psb_intel_encoder = kzalloc(sizeof(struct psb_intel_encoder), GFP_KERNEL);
 339         if (!psb_intel_encoder)
 340                 return;
 341
 342         psb_intel_connector = kzalloc(sizeof(struct psb_intel_connector), GFP_KERNEL);
 343         if (!psb_intel_connector)
 344                 goto failed_connector;
 345
 346         connector = &psb_intel_connector->base;
 347         encoder = &psb_intel_encoder->base;
 348         dev_priv->is_lvds_on = true;
 349         drm_connector_init(dev, connector,
 350                            &psb_intel_lvds_connector_funcs,
 351                            DRM_MODE_CONNECTOR_LVDS);
 352
 353         drm_encoder_init(dev, encoder, &psb_intel_lvds_enc_funcs,
 354                          DRM_MODE_ENCODER_LVDS);
 355
 356         psb_intel_connector_attach_encoder(psb_intel_connector,
 357                                            psb_intel_encoder);
 358         psb_intel_encoder->type = INTEL_OUTPUT_LVDS;
 359
 360         drm_encoder_helper_add(encoder, &oaktrail_lvds_helper_funcs);
 361         drm_connector_helper_add(connector,
 362                                  &psb_intel_lvds_connector_helper_funcs);
 363         connector->display_info.subpixel_order = SubPixelHorizontalRGB;
 364         connector->interlace_allowed = false;
 365         connector->doublescan_allowed = false;
 366
 367         drm_connector_attach_property(connector,
 368                                         dev->mode_config.scaling_mode_property,
 369                                         DRM_MODE_SCALE_FULLSCREEN);
 370         drm_connector_attach_property(connector,
 371                                         dev_priv->backlight_property,
 372                                         BRIGHTNESS_MAX_LEVEL);
 373
 374         mode_dev->panel_wants_dither = false;
 375         if (dev_priv->vbt_data.size != 0x00)
 376                 mode_dev->panel_wants_dither = (dev_priv->gct_data.
 377                         Panel_Port_Control & MRST_PANEL_8TO6_DITHER_ENABLE);
 378         if (dev_priv->lvds_dither)
 379                 mode_dev->panel_wants_dither = 1;
 380
 381         /*
 382          * LVDS discovery:
 383          * 1) check for EDID on DDC
 384          * 2) check for VBT data
 385          * 3) check to see if LVDS is already on
 386          *    if none of the above, no panel
 387          * 4) make sure lid is open
 388          *    if closed, act like it's not there for now
 389          */
 390
 391         i2c_adap = i2c_get_adapter(dev_priv->ops->i2c_bus);
 392         if (i2c_adap == NULL)
 393                 dev_err(dev->dev, "No ddc adapter available!\n");
 394         /*
 395          * Attempt to get the fixed panel mode from DDC.  Assume that the
 396          * preferred mode is the right one.
 397          */
 398         if (i2c_adap) {
 399                 edid = drm_get_edid(connector, i2c_adap);
 400                 if (edid) {
 401                         drm_mode_connector_update_edid_property(connector,
 402                                                                         edid);
 403                         ret = drm_add_edid_modes(connector, edid);
 404                         kfree(edid);
 405                 }
 406
 407                 list_for_each_entry(scan, &connector->probed_modes, head) {
 408                         if (scan->type & DRM_MODE_TYPE_PREFERRED) {
 409                                 mode_dev->panel_fixed_mode =
 410                                     drm_mode_duplicate(dev, scan);
 411                                 goto out;       /* FIXME: check for quirks */
 412                         }
 413                 }
 414         }
 415         /*
 416          * If we didn't get EDID, try geting panel timing
 417          * from configuration data
 418          */
 419         oaktrail_lvds_get_configuration_mode(dev, mode_dev);
 420
 421         if (mode_dev->panel_fixed_mode) {
 422                 mode_dev->panel_fixed_mode->type |= DRM_MODE_TYPE_PREFERRED;
 423                 goto out;       /* FIXME: check for quirks */
 424         }
 425
 426         /* If we still don't have a mode after all that, give up. */
 427         if (!mode_dev->panel_fixed_mode) {
 428                 dev_err(dev->dev, "Found no modes on the lvds, ignoring the LVDS\n");
 429                 goto failed_find;
 430         }
 431
 432 out:
 433         drm_sysfs_connector_add(connector);
 434         return;
 435
 436 failed_find:
 437         dev_dbg(dev->dev, "No LVDS modes found, disabling.\n");
 438         if (psb_intel_encoder->ddc_bus)
 439                 psb_intel_i2c_destroy(psb_intel_encoder->ddc_bus);
 440
 441 /* failed_ddc: */
 442
 443         drm_encoder_cleanup(encoder);
 444         drm_connector_cleanup(connector);
 445         kfree(psb_intel_connector);
 446 failed_connector:
 447         kfree(psb_intel_encoder);
 448 }
 449