drivers/gpu/drm/gma500/oaktrail_lvds.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Copyright © 2006-2009 Intel Corporation
   4  *
   5  * Authors:
   6  *      Eric Anholt <eric@anholt.net>
   7  *      Dave Airlie <airlied@linux.ie>
   8  *      Jesse Barnes <jesse.barnes@intel.com>
   9  */
  10
  11 #include <linux/i2c.h>
  12 #include <linux/pm_runtime.h>
  13
  14 #include <asm/intel-mid.h>
  15
  16 #include <drm/drm_simple_kms_helper.h>
  17
  18 #include "intel_bios.h"
  19 #include "power.h"
  20 #include "psb_drv.h"
  21 #include "psb_intel_drv.h"
  22 #include "psb_intel_reg.h"
  23
  24 /* The max/min PWM frequency in BPCR[31:17] - */
  25 /* The smallest number is 1 (not 0) that can fit in the
  26  * 15-bit field of the and then*/
  27 /* shifts to the left by one bit to get the actual 16-bit
  28  * value that the 15-bits correspond to.*/
  29 #define MRST_BLC_MAX_PWM_REG_FREQ           0xFFFF
  30 #define BRIGHTNESS_MAX_LEVEL 100
  31
  32 /*
  33  * Sets the power state for the panel.
  34  */
  35 static void oaktrail_lvds_set_power(struct drm_device *dev,
  36                                 struct gma_encoder *gma_encoder,
  37                                 bool on)
  38 {
  39         u32 pp_status;
  40         struct drm_psb_private *dev_priv = to_drm_psb_private(dev);
  41
  42         if (!gma_power_begin(dev, true))
  43                 return;
  44
  45         if (on) {
  46                 REG_WRITE(PP_CONTROL, REG_READ(PP_CONTROL) |
  47                           POWER_TARGET_ON);
  48                 do {
  49                         pp_status = REG_READ(PP_STATUS);
  50                 } while ((pp_status & (PP_ON | PP_READY)) == PP_READY);
  51                 dev_priv->is_lvds_on = true;
  52                 if (dev_priv->ops->lvds_bl_power)
  53                         dev_priv->ops->lvds_bl_power(dev, true);
  54         } else {
  55                 if (dev_priv->ops->lvds_bl_power)
  56                         dev_priv->ops->lvds_bl_power(dev, false);
  57                 REG_WRITE(PP_CONTROL, REG_READ(PP_CONTROL) &
  58                           ~POWER_TARGET_ON);
  59                 do {
  60                         pp_status = REG_READ(PP_STATUS);
  61                 } while (pp_status & PP_ON);
  62                 dev_priv->is_lvds_on = false;
  63                 pm_request_idle(dev->dev);
  64         }
  65         gma_power_end(dev);
  66 }
  67
  68 static void oaktrail_lvds_dpms(struct drm_encoder *encoder, int mode)
  69 {
  70         struct drm_device *dev = encoder->dev;
  71         struct gma_encoder *gma_encoder = to_gma_encoder(encoder);
  72
  73         if (mode == DRM_MODE_DPMS_ON)
  74                 oaktrail_lvds_set_power(dev, gma_encoder, true);
  75         else
  76                 oaktrail_lvds_set_power(dev, gma_encoder, false);
  77
  78         /* XXX: We never power down the LVDS pairs. */
  79 }
  80
  81 static void oaktrail_lvds_mode_set(struct drm_encoder *encoder,
  82                                struct drm_display_mode *mode,
  83                                struct drm_display_mode *adjusted_mode)
  84 {
  85         struct drm_device *dev = encoder->dev;
  86         struct drm_psb_private *dev_priv = to_drm_psb_private(dev);
  87         struct psb_intel_mode_device *mode_dev = &dev_priv->mode_dev;
  88         struct drm_connector_list_iter conn_iter;
  89         struct drm_connector *connector = NULL;
  90         struct drm_crtc *crtc = encoder->crtc;
  91         u32 lvds_port;
  92         uint64_t v = DRM_MODE_SCALE_FULLSCREEN;
  93
  94         if (!gma_power_begin(dev, true))
  95                 return;
  96
  97         /*
  98          * The LVDS pin pair will already have been turned on in the
  99          * psb_intel_crtc_mode_set since it has a large impact on the DPLL
 100          * settings.
 101          */
 102         lvds_port = (REG_READ(LVDS) &
 103                     (~LVDS_PIPEB_SELECT)) |
 104                     LVDS_PORT_EN |
 105                     LVDS_BORDER_EN;
 106
 107         /* If the firmware says dither on Moorestown, or the BIOS does
 108            on Oaktrail then enable dithering */
 109         if (mode_dev->panel_wants_dither || dev_priv->lvds_dither)
 110                 lvds_port |= MRST_PANEL_8TO6_DITHER_ENABLE;
 111
 112         REG_WRITE(LVDS, lvds_port);
 113
 114         /* Find the connector we're trying to set up */
 115         drm_connector_list_iter_begin(dev, &conn_iter);
 116         drm_for_each_connector_iter(connector, &conn_iter) {
 117                 if (connector->encoder && connector->encoder->crtc == crtc)
 118                         break;
 119         }
 120
 121         if (!connector) {
 122                 drm_connector_list_iter_end(&conn_iter);
 123                 DRM_ERROR("Couldn't find connector when setting mode");
 124                 gma_power_end(dev);
 125                 return;
 126         }
 127
 128         drm_object_property_get_value( &connector->base,
 129                 dev->mode_config.scaling_mode_property, &v);
 130         drm_connector_list_iter_end(&conn_iter);
 131
 132         if (v == DRM_MODE_SCALE_NO_SCALE)
 133                 REG_WRITE(PFIT_CONTROL, 0);
 134         else if (v == DRM_MODE_SCALE_ASPECT) {
 135                 if ((mode->vdisplay != adjusted_mode->crtc_vdisplay) ||
 136                     (mode->hdisplay != adjusted_mode->crtc_hdisplay)) {
 137                         if ((adjusted_mode->crtc_hdisplay * mode->vdisplay) ==
 138                             (mode->hdisplay * adjusted_mode->crtc_vdisplay))
 139                                 REG_WRITE(PFIT_CONTROL, PFIT_ENABLE);
 140                         else if ((adjusted_mode->crtc_hdisplay *
 141                                 mode->vdisplay) > (mode->hdisplay *
 142                                 adjusted_mode->crtc_vdisplay))
 143                                 REG_WRITE(PFIT_CONTROL, PFIT_ENABLE |
 144                                           PFIT_SCALING_MODE_PILLARBOX);
 145                         else
 146                                 REG_WRITE(PFIT_CONTROL, PFIT_ENABLE |
 147                                           PFIT_SCALING_MODE_LETTERBOX);
 148                 } else
 149                         REG_WRITE(PFIT_CONTROL, PFIT_ENABLE);
 150         } else /*(v == DRM_MODE_SCALE_FULLSCREEN)*/
 151                 REG_WRITE(PFIT_CONTROL, PFIT_ENABLE);
 152
 153         gma_power_end(dev);
 154 }
 155
 156 static void oaktrail_lvds_prepare(struct drm_encoder *encoder)
 157 {
 158         struct drm_device *dev = encoder->dev;
 159         struct drm_psb_private *dev_priv = to_drm_psb_private(dev);
 160         struct gma_encoder *gma_encoder = to_gma_encoder(encoder);
 161         struct psb_intel_mode_device *mode_dev = &dev_priv->mode_dev;
 162
 163         if (!gma_power_begin(dev, true))
 164                 return;
 165
 166         mode_dev->saveBLC_PWM_CTL = REG_READ(BLC_PWM_CTL);
 167         mode_dev->backlight_duty_cycle = (mode_dev->saveBLC_PWM_CTL &
 168                                           BACKLIGHT_DUTY_CYCLE_MASK);
 169         oaktrail_lvds_set_power(dev, gma_encoder, false);
 170         gma_power_end(dev);
 171 }
 172
 173 static u32 oaktrail_lvds_get_max_backlight(struct drm_device *dev)
 174 {
 175         struct drm_psb_private *dev_priv = to_drm_psb_private(dev);
 176         u32 ret;
 177
 178         if (gma_power_begin(dev, false)) {
 179                 ret = ((REG_READ(BLC_PWM_CTL) &
 180                           BACKLIGHT_MODULATION_FREQ_MASK) >>
 181                           BACKLIGHT_MODULATION_FREQ_SHIFT) * 2;
 182
 183                 gma_power_end(dev);
 184         } else
 185                 ret = ((dev_priv->regs.saveBLC_PWM_CTL &
 186                           BACKLIGHT_MODULATION_FREQ_MASK) >>
 187                           BACKLIGHT_MODULATION_FREQ_SHIFT) * 2;
 188
 189         return ret;
 190 }
 191
 192 static void oaktrail_lvds_commit(struct drm_encoder *encoder)
 193 {
 194         struct drm_device *dev = encoder->dev;
 195         struct drm_psb_private *dev_priv = to_drm_psb_private(dev);
 196         struct gma_encoder *gma_encoder = to_gma_encoder(encoder);
 197         struct psb_intel_mode_device *mode_dev = &dev_priv->mode_dev;
 198
 199         if (mode_dev->backlight_duty_cycle == 0)
 200                 mode_dev->backlight_duty_cycle =
 201                                         oaktrail_lvds_get_max_backlight(dev);
 202         oaktrail_lvds_set_power(dev, gma_encoder, true);
 203 }
 204
 205 static const struct drm_encoder_helper_funcs oaktrail_lvds_helper_funcs = {
 206         .dpms = oaktrail_lvds_dpms,
 207         .mode_fixup = psb_intel_lvds_mode_fixup,
 208         .prepare = oaktrail_lvds_prepare,
 209         .mode_set = oaktrail_lvds_mode_set,
 210         .commit = oaktrail_lvds_commit,
 211 };
 212
 213 /* Returns the panel fixed mode from configuration. */
 214
 215 static void oaktrail_lvds_get_configuration_mode(struct drm_device *dev,
 216                                         struct psb_intel_mode_device *mode_dev)
 217 {
 218         struct drm_display_mode *mode = NULL;
 219         struct drm_psb_private *dev_priv = to_drm_psb_private(dev);
 220         struct oaktrail_timing_info *ti = &dev_priv->gct_data.DTD;
 221
 222         mode_dev->panel_fixed_mode = NULL;
 223
 224         /* Use the firmware provided data on Moorestown */
 225         if (dev_priv->has_gct) {
 226                 mode = kzalloc(sizeof(*mode), GFP_KERNEL);
 227                 if (!mode)
 228                         return;
 229
 230                 mode->hdisplay = (ti->hactive_hi << 8) | ti->hactive_lo;
 231                 mode->vdisplay = (ti->vactive_hi << 8) | ti->vactive_lo;
 232                 mode->hsync_start = mode->hdisplay + \
 233                                 ((ti->hsync_offset_hi << 8) | \
 234                                 ti->hsync_offset_lo);
 235                 mode->hsync_end = mode->hsync_start + \
 236                                 ((ti->hsync_pulse_width_hi << 8) | \
 237                                 ti->hsync_pulse_width_lo);
 238                 mode->htotal = mode->hdisplay + ((ti->hblank_hi << 8) | \
 239                                                         ti->hblank_lo);
 240                 mode->vsync_start = \
 241                         mode->vdisplay + ((ti->vsync_offset_hi << 4) | \
 242                                                 ti->vsync_offset_lo);
 243                 mode->vsync_end = \
 244                         mode->vsync_start + ((ti->vsync_pulse_width_hi << 4) | \
 245                                                 ti->vsync_pulse_width_lo);
 246                 mode->vtotal = mode->vdisplay + \
 247                                 ((ti->vblank_hi << 8) | ti->vblank_lo);
 248                 mode->clock = ti->pixel_clock * 10;
 249 #if 0
 250                 pr_info("hdisplay is %d\n", mode->hdisplay);
 251                 pr_info("vdisplay is %d\n", mode->vdisplay);
 252                 pr_info("HSS is %d\n", mode->hsync_start);
 253                 pr_info("HSE is %d\n", mode->hsync_end);
 254                 pr_info("htotal is %d\n", mode->htotal);
 255                 pr_info("VSS is %d\n", mode->vsync_start);
 256                 pr_info("VSE is %d\n", mode->vsync_end);
 257                 pr_info("vtotal is %d\n", mode->vtotal);
 258                 pr_info("clock is %d\n", mode->clock);
 259 #endif
 260                 mode_dev->panel_fixed_mode = mode;
 261         }
 262
 263         /* Use the BIOS VBT mode if available */
 264         if (mode_dev->panel_fixed_mode == NULL && mode_dev->vbt_mode)
 265                 mode_dev->panel_fixed_mode = drm_mode_duplicate(dev,
 266                                                 mode_dev->vbt_mode);
 267
 268         /* Then try the LVDS VBT mode */
 269         if (mode_dev->panel_fixed_mode == NULL)
 270                 if (dev_priv->lfp_lvds_vbt_mode)
 271                         mode_dev->panel_fixed_mode =
 272                                 drm_mode_duplicate(dev,
 273                                         dev_priv->lfp_lvds_vbt_mode);
 274
 275         /* If we still got no mode then bail */
 276         if (mode_dev->panel_fixed_mode == NULL)
 277                 return;
 278
 279         drm_mode_set_name(mode_dev->panel_fixed_mode);
 280         drm_mode_set_crtcinfo(mode_dev->panel_fixed_mode, 0);
 281 }
 282
 283 /**
 284  * oaktrail_lvds_init - setup LVDS connectors on this device
 285  * @dev: drm device
 286  * @mode_dev: PSB mode device
 287  *
 288  * Create the connector, register the LVDS DDC bus, and try to figure out what
 289  * modes we can display on the LVDS panel (if present).
 290  */
 291 void oaktrail_lvds_init(struct drm_device *dev,
 292                     struct psb_intel_mode_device *mode_dev)
 293 {
 294         struct gma_encoder *gma_encoder;
 295         struct gma_connector *gma_connector;
 296         struct drm_connector *connector;
 297         struct drm_encoder *encoder;
 298         struct drm_psb_private *dev_priv = to_drm_psb_private(dev);
 299         struct edid *edid;
 300         struct i2c_adapter *i2c_adap;
 301         struct drm_display_mode *scan;  /* *modes, *bios_mode; */
 302
 303         gma_encoder = kzalloc(sizeof(struct gma_encoder), GFP_KERNEL);
 304         if (!gma_encoder)
 305                 return;
 306
 307         gma_connector = kzalloc(sizeof(struct gma_connector), GFP_KERNEL);
 308         if (!gma_connector)
 309                 goto failed_connector;
 310
 311         connector = &gma_connector->base;
 312         encoder = &gma_encoder->base;
 313         dev_priv->is_lvds_on = true;
 314         drm_connector_init(dev, connector,
 315                            &psb_intel_lvds_connector_funcs,
 316                            DRM_MODE_CONNECTOR_LVDS);
 317
 318         drm_simple_encoder_init(dev, encoder, DRM_MODE_ENCODER_LVDS);
 319
 320         gma_connector_attach_encoder(gma_connector, gma_encoder);
 321         gma_encoder->type = INTEL_OUTPUT_LVDS;
 322
 323         drm_encoder_helper_add(encoder, &oaktrail_lvds_helper_funcs);
 324         drm_connector_helper_add(connector,
 325                                  &psb_intel_lvds_connector_helper_funcs);
 326         connector->display_info.subpixel_order = SubPixelHorizontalRGB;
 327         connector->interlace_allowed = false;
 328         connector->doublescan_allowed = false;
 329
 330         drm_object_attach_property(&connector->base,
 331                                         dev->mode_config.scaling_mode_property,
 332                                         DRM_MODE_SCALE_FULLSCREEN);
 333         drm_object_attach_property(&connector->base,
 334                                         dev_priv->backlight_property,
 335                                         BRIGHTNESS_MAX_LEVEL);
 336
 337         mode_dev->panel_wants_dither = false;
 338         if (dev_priv->has_gct)
 339                 mode_dev->panel_wants_dither = (dev_priv->gct_data.
 340                         Panel_Port_Control & MRST_PANEL_8TO6_DITHER_ENABLE);
 341         if (dev_priv->lvds_dither)
 342                 mode_dev->panel_wants_dither = 1;
 343
 344         /*
 345          * LVDS discovery:
 346          * 1) check for EDID on DDC
 347          * 2) check for VBT data
 348          * 3) check to see if LVDS is already on
 349          *    if none of the above, no panel
 350          * 4) make sure lid is open
 351          *    if closed, act like it's not there for now
 352          */
 353
 354         edid = NULL;
 355         mutex_lock(&dev->mode_config.mutex);
 356         i2c_adap = i2c_get_adapter(dev_priv->ops->i2c_bus);
 357         if (i2c_adap)
 358                 edid = drm_get_edid(connector, i2c_adap);
 359         if (edid == NULL && dev_priv->lpc_gpio_base) {
 360                 oaktrail_lvds_i2c_init(encoder);
 361                 if (gma_encoder->ddc_bus != NULL) {
 362                         i2c_adap = &gma_encoder->ddc_bus->adapter;
 363                         edid = drm_get_edid(connector, i2c_adap);
 364                 }
 365         }
 366         /*
 367          * Attempt to get the fixed panel mode from DDC.  Assume that the
 368          * preferred mode is the right one.
 369          */
 370         if (edid) {
 371                 drm_connector_update_edid_property(connector, edid);
 372                 drm_add_edid_modes(connector, edid);
 373                 kfree(edid);
 374
 375                 list_for_each_entry(scan, &connector->probed_modes, head) {
 376                         if (scan->type & DRM_MODE_TYPE_PREFERRED) {
 377                                 mode_dev->panel_fixed_mode =
 378                                     drm_mode_duplicate(dev, scan);
 379                                 goto out;       /* FIXME: check for quirks */
 380                         }
 381                 }
 382         } else
 383                 dev_err(dev->dev, "No ddc adapter available!\n");
 384         /*
 385          * If we didn't get EDID, try geting panel timing
 386          * from configuration data
 387          */
 388         oaktrail_lvds_get_configuration_mode(dev, mode_dev);
 389
 390         if (mode_dev->panel_fixed_mode) {
 391                 mode_dev->panel_fixed_mode->type |= DRM_MODE_TYPE_PREFERRED;
 392                 goto out;       /* FIXME: check for quirks */
 393         }
 394
 395         /* If we still don't have a mode after all that, give up. */
 396         if (!mode_dev->panel_fixed_mode) {
 397                 dev_err(dev->dev, "Found no modes on the lvds, ignoring the LVDS\n");
 398                 goto failed_find;
 399         }
 400
 401 out:
 402         mutex_unlock(&dev->mode_config.mutex);
 403
 404         return;
 405
 406 failed_find:
 407         mutex_unlock(&dev->mode_config.mutex);
 408
 409         dev_dbg(dev->dev, "No LVDS modes found, disabling.\n");
 410         if (gma_encoder->ddc_bus) {
 411                 psb_intel_i2c_destroy(gma_encoder->ddc_bus);
 412                 gma_encoder->ddc_bus = NULL;
 413         }
 414
 415 /* failed_ddc: */
 416
 417         drm_encoder_cleanup(encoder);
 418         drm_connector_cleanup(connector);
 419         kfree(gma_connector);
 420 failed_connector:
 421         kfree(gma_encoder);
 422 }
 423