2 * Copyright © 2006-2007 Intel Corporation
3 * Copyright (c) 2006 Dave Airlie <airlied@linux.ie>
5 * Permission is hereby granted, free of charge, to any person obtaining a
6 * copy of this software and associated documentation files (the "Software"),
7 * to deal in the Software without restriction, including without limitation
8 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
9 * and/or sell copies of the Software, and to permit persons to whom the
10 * Software is furnished to do so, subject to the following conditions:
12 * The above copyright notice and this permission notice (including the next
13 * paragraph) shall be included in all copies or substantial portions of the
16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
17 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
18 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
19 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
20 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
21 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
22 * DEALINGS IN THE SOFTWARE.
25 * Eric Anholt <eric@anholt.net>
26 * Dave Airlie <airlied@linux.ie>
27 * Jesse Barnes <jesse.barnes@intel.com>
30 #include <acpi/button.h>
31 #include <linux/dmi.h>
32 #include <linux/i2c.h>
33 #include <linux/slab.h>
38 #include "intel_drv.h"
41 #include <linux/acpi.h>
43 /* Private structure for the integrated LVDS support */
45 struct intel_encoder base;
54 struct drm_display_mode *fixed_mode;
57 static struct intel_lvds *to_intel_lvds(struct drm_encoder *encoder)
59 return container_of(encoder, struct intel_lvds, base.base);
62 static struct intel_lvds *intel_attached_lvds(struct drm_connector *connector)
64 return container_of(intel_attached_encoder(connector),
65 struct intel_lvds, base);
69 * Sets the power state for the panel.
71 static void intel_lvds_set_power(struct intel_lvds *intel_lvds, bool on)
73 struct drm_device *dev = intel_lvds->base.base.dev;
74 struct drm_i915_private *dev_priv = dev->dev_private;
75 u32 ctl_reg, lvds_reg;
77 if (HAS_PCH_SPLIT(dev)) {
78 ctl_reg = PCH_PP_CONTROL;
86 I915_WRITE(lvds_reg, I915_READ(lvds_reg) | LVDS_PORT_EN);
87 I915_WRITE(ctl_reg, I915_READ(ctl_reg) | POWER_TARGET_ON);
88 intel_panel_set_backlight(dev, dev_priv->backlight_level);
90 dev_priv->backlight_level = intel_panel_get_backlight(dev);
92 intel_panel_set_backlight(dev, 0);
93 I915_WRITE(ctl_reg, I915_READ(ctl_reg) & ~POWER_TARGET_ON);
95 if (intel_lvds->pfit_control) {
96 if (wait_for((I915_READ(PP_STATUS) & PP_ON) == 0, 1000))
97 DRM_ERROR("timed out waiting for panel to power off\n");
98 I915_WRITE(PFIT_CONTROL, 0);
99 intel_lvds->pfit_control = 0;
100 intel_lvds->pfit_dirty = false;
103 I915_WRITE(lvds_reg, I915_READ(lvds_reg) & ~LVDS_PORT_EN);
105 POSTING_READ(lvds_reg);
108 static void intel_lvds_dpms(struct drm_encoder *encoder, int mode)
110 struct intel_lvds *intel_lvds = to_intel_lvds(encoder);
112 if (mode == DRM_MODE_DPMS_ON)
113 intel_lvds_set_power(intel_lvds, true);
115 intel_lvds_set_power(intel_lvds, false);
117 /* XXX: We never power down the LVDS pairs. */
120 static int intel_lvds_mode_valid(struct drm_connector *connector,
121 struct drm_display_mode *mode)
123 struct intel_lvds *intel_lvds = intel_attached_lvds(connector);
124 struct drm_display_mode *fixed_mode = intel_lvds->fixed_mode;
126 if (mode->hdisplay > fixed_mode->hdisplay)
128 if (mode->vdisplay > fixed_mode->vdisplay)
135 centre_horizontally(struct drm_display_mode *mode,
138 u32 border, sync_pos, blank_width, sync_width;
140 /* keep the hsync and hblank widths constant */
141 sync_width = mode->crtc_hsync_end - mode->crtc_hsync_start;
142 blank_width = mode->crtc_hblank_end - mode->crtc_hblank_start;
143 sync_pos = (blank_width - sync_width + 1) / 2;
145 border = (mode->hdisplay - width + 1) / 2;
146 border += border & 1; /* make the border even */
148 mode->crtc_hdisplay = width;
149 mode->crtc_hblank_start = width + border;
150 mode->crtc_hblank_end = mode->crtc_hblank_start + blank_width;
152 mode->crtc_hsync_start = mode->crtc_hblank_start + sync_pos;
153 mode->crtc_hsync_end = mode->crtc_hsync_start + sync_width;
157 centre_vertically(struct drm_display_mode *mode,
160 u32 border, sync_pos, blank_width, sync_width;
162 /* keep the vsync and vblank widths constant */
163 sync_width = mode->crtc_vsync_end - mode->crtc_vsync_start;
164 blank_width = mode->crtc_vblank_end - mode->crtc_vblank_start;
165 sync_pos = (blank_width - sync_width + 1) / 2;
167 border = (mode->vdisplay - height + 1) / 2;
169 mode->crtc_vdisplay = height;
170 mode->crtc_vblank_start = height + border;
171 mode->crtc_vblank_end = mode->crtc_vblank_start + blank_width;
173 mode->crtc_vsync_start = mode->crtc_vblank_start + sync_pos;
174 mode->crtc_vsync_end = mode->crtc_vsync_start + sync_width;
177 static inline u32 panel_fitter_scaling(u32 source, u32 target)
180 * Floating point operation is not supported. So the FACTOR
181 * is defined, which can avoid the floating point computation
182 * when calculating the panel ratio.
185 #define FACTOR (1 << ACCURACY)
186 u32 ratio = source * FACTOR / target;
187 return (FACTOR * ratio + FACTOR/2) / FACTOR;
190 static bool intel_lvds_mode_fixup(struct drm_encoder *encoder,
191 struct drm_display_mode *mode,
192 struct drm_display_mode *adjusted_mode)
194 struct drm_device *dev = encoder->dev;
195 struct drm_i915_private *dev_priv = dev->dev_private;
196 struct intel_crtc *intel_crtc = to_intel_crtc(encoder->crtc);
197 struct intel_lvds *intel_lvds = to_intel_lvds(encoder);
198 struct drm_encoder *tmp_encoder;
199 u32 pfit_control = 0, pfit_pgm_ratios = 0, border = 0;
201 /* Should never happen!! */
202 if (INTEL_INFO(dev)->gen < 4 && intel_crtc->pipe == 0) {
203 DRM_ERROR("Can't support LVDS on pipe A\n");
207 /* Should never happen!! */
208 list_for_each_entry(tmp_encoder, &dev->mode_config.encoder_list, head) {
209 if (tmp_encoder != encoder && tmp_encoder->crtc == encoder->crtc) {
210 DRM_ERROR("Can't enable LVDS and another "
211 "encoder on the same pipe\n");
217 * We have timings from the BIOS for the panel, put them in
218 * to the adjusted mode. The CRTC will be set up for this mode,
219 * with the panel scaling set up to source from the H/VDisplay
220 * of the original mode.
222 intel_fixed_panel_mode(intel_lvds->fixed_mode, adjusted_mode);
224 if (HAS_PCH_SPLIT(dev)) {
225 intel_pch_panel_fitting(dev, intel_lvds->fitting_mode,
226 mode, adjusted_mode);
230 /* Make sure pre-965s set dither correctly */
231 if (INTEL_INFO(dev)->gen < 4) {
232 if (dev_priv->lvds_dither)
233 pfit_control |= PANEL_8TO6_DITHER_ENABLE;
236 /* Native modes don't need fitting */
237 if (adjusted_mode->hdisplay == mode->hdisplay &&
238 adjusted_mode->vdisplay == mode->vdisplay)
241 /* 965+ wants fuzzy fitting */
242 if (INTEL_INFO(dev)->gen >= 4)
243 pfit_control |= ((intel_crtc->pipe << PFIT_PIPE_SHIFT) |
247 * Enable automatic panel scaling for non-native modes so that they fill
248 * the screen. Should be enabled before the pipe is enabled, according
249 * to register description and PRM.
250 * Change the value here to see the borders for debugging
252 I915_WRITE(BCLRPAT_A, 0);
253 I915_WRITE(BCLRPAT_B, 0);
255 switch (intel_lvds->fitting_mode) {
256 case DRM_MODE_SCALE_CENTER:
258 * For centered modes, we have to calculate border widths &
259 * heights and modify the values programmed into the CRTC.
261 centre_horizontally(adjusted_mode, mode->hdisplay);
262 centre_vertically(adjusted_mode, mode->vdisplay);
263 border = LVDS_BORDER_ENABLE;
266 case DRM_MODE_SCALE_ASPECT:
267 /* Scale but preserve the aspect ratio */
268 if (INTEL_INFO(dev)->gen >= 4) {
269 u32 scaled_width = adjusted_mode->hdisplay * mode->vdisplay;
270 u32 scaled_height = mode->hdisplay * adjusted_mode->vdisplay;
272 pfit_control |= PFIT_ENABLE;
273 /* 965+ is easy, it does everything in hw */
274 if (scaled_width > scaled_height)
275 pfit_control |= PFIT_SCALING_PILLAR;
276 else if (scaled_width < scaled_height)
277 pfit_control |= PFIT_SCALING_LETTER;
279 pfit_control |= PFIT_SCALING_AUTO;
281 u32 scaled_width = adjusted_mode->hdisplay * mode->vdisplay;
282 u32 scaled_height = mode->hdisplay * adjusted_mode->vdisplay;
284 * For earlier chips we have to calculate the scaling
285 * ratio by hand and program it into the
286 * PFIT_PGM_RATIO register
288 if (scaled_width > scaled_height) { /* pillar */
289 centre_horizontally(adjusted_mode, scaled_height / mode->vdisplay);
291 border = LVDS_BORDER_ENABLE;
292 if (mode->vdisplay != adjusted_mode->vdisplay) {
293 u32 bits = panel_fitter_scaling(mode->vdisplay, adjusted_mode->vdisplay);
294 pfit_pgm_ratios |= (bits << PFIT_HORIZ_SCALE_SHIFT |
295 bits << PFIT_VERT_SCALE_SHIFT);
296 pfit_control |= (PFIT_ENABLE |
297 VERT_INTERP_BILINEAR |
298 HORIZ_INTERP_BILINEAR);
300 } else if (scaled_width < scaled_height) { /* letter */
301 centre_vertically(adjusted_mode, scaled_width / mode->hdisplay);
303 border = LVDS_BORDER_ENABLE;
304 if (mode->hdisplay != adjusted_mode->hdisplay) {
305 u32 bits = panel_fitter_scaling(mode->hdisplay, adjusted_mode->hdisplay);
306 pfit_pgm_ratios |= (bits << PFIT_HORIZ_SCALE_SHIFT |
307 bits << PFIT_VERT_SCALE_SHIFT);
308 pfit_control |= (PFIT_ENABLE |
309 VERT_INTERP_BILINEAR |
310 HORIZ_INTERP_BILINEAR);
313 /* Aspects match, Let hw scale both directions */
314 pfit_control |= (PFIT_ENABLE |
315 VERT_AUTO_SCALE | HORIZ_AUTO_SCALE |
316 VERT_INTERP_BILINEAR |
317 HORIZ_INTERP_BILINEAR);
321 case DRM_MODE_SCALE_FULLSCREEN:
323 * Full scaling, even if it changes the aspect ratio.
324 * Fortunately this is all done for us in hw.
326 pfit_control |= PFIT_ENABLE;
327 if (INTEL_INFO(dev)->gen >= 4)
328 pfit_control |= PFIT_SCALING_AUTO;
330 pfit_control |= (VERT_AUTO_SCALE | HORIZ_AUTO_SCALE |
331 VERT_INTERP_BILINEAR |
332 HORIZ_INTERP_BILINEAR);
340 if (pfit_control != intel_lvds->pfit_control ||
341 pfit_pgm_ratios != intel_lvds->pfit_pgm_ratios) {
342 intel_lvds->pfit_control = pfit_control;
343 intel_lvds->pfit_pgm_ratios = pfit_pgm_ratios;
344 intel_lvds->pfit_dirty = true;
346 dev_priv->lvds_border_bits = border;
349 * XXX: It would be nice to support lower refresh rates on the
350 * panels to reduce power consumption, and perhaps match the
351 * user's requested refresh rate.
357 static void intel_lvds_prepare(struct drm_encoder *encoder)
359 struct drm_device *dev = encoder->dev;
360 struct drm_i915_private *dev_priv = dev->dev_private;
361 struct intel_lvds *intel_lvds = to_intel_lvds(encoder);
363 dev_priv->backlight_level = intel_panel_get_backlight(dev);
365 /* We try to do the minimum that is necessary in order to unlock
366 * the registers for mode setting.
368 * On Ironlake, this is quite simple as we just set the unlock key
369 * and ignore all subtleties. (This may cause some issues...)
371 * Prior to Ironlake, we must disable the pipe if we want to adjust
372 * the panel fitter. However at all other times we can just reset
373 * the registers regardless.
376 if (HAS_PCH_SPLIT(dev)) {
377 I915_WRITE(PCH_PP_CONTROL,
378 I915_READ(PCH_PP_CONTROL) | PANEL_UNLOCK_REGS);
379 } else if (intel_lvds->pfit_dirty) {
380 I915_WRITE(PP_CONTROL,
381 (I915_READ(PP_CONTROL) | PANEL_UNLOCK_REGS)
384 I915_WRITE(PP_CONTROL,
385 I915_READ(PP_CONTROL) | PANEL_UNLOCK_REGS);
389 static void intel_lvds_commit(struct drm_encoder *encoder)
391 struct drm_device *dev = encoder->dev;
392 struct drm_i915_private *dev_priv = dev->dev_private;
393 struct intel_lvds *intel_lvds = to_intel_lvds(encoder);
395 if (dev_priv->backlight_level == 0)
396 dev_priv->backlight_level = intel_panel_get_max_backlight(dev);
398 /* Undo any unlocking done in prepare to prevent accidental
399 * adjustment of the registers.
401 if (HAS_PCH_SPLIT(dev)) {
402 u32 val = I915_READ(PCH_PP_CONTROL);
403 if ((val & PANEL_UNLOCK_REGS) == PANEL_UNLOCK_REGS)
404 I915_WRITE(PCH_PP_CONTROL, val & 0x3);
406 u32 val = I915_READ(PP_CONTROL);
407 if ((val & PANEL_UNLOCK_REGS) == PANEL_UNLOCK_REGS)
408 I915_WRITE(PP_CONTROL, val & 0x3);
411 /* Always do a full power on as we do not know what state
414 intel_lvds_set_power(intel_lvds, true);
417 static void intel_lvds_mode_set(struct drm_encoder *encoder,
418 struct drm_display_mode *mode,
419 struct drm_display_mode *adjusted_mode)
421 struct drm_device *dev = encoder->dev;
422 struct drm_i915_private *dev_priv = dev->dev_private;
423 struct intel_lvds *intel_lvds = to_intel_lvds(encoder);
426 * The LVDS pin pair will already have been turned on in the
427 * intel_crtc_mode_set since it has a large impact on the DPLL
431 if (HAS_PCH_SPLIT(dev))
434 if (!intel_lvds->pfit_dirty)
438 * Enable automatic panel scaling so that non-native modes fill the
439 * screen. Should be enabled before the pipe is enabled, according to
440 * register description and PRM.
442 DRM_DEBUG_KMS("applying panel-fitter: %x, %x\n",
443 intel_lvds->pfit_control,
444 intel_lvds->pfit_pgm_ratios);
445 if (wait_for((I915_READ(PP_STATUS) & PP_ON) == 0, 1000))
446 DRM_ERROR("timed out waiting for panel to power off\n");
448 I915_WRITE(PFIT_PGM_RATIOS, intel_lvds->pfit_pgm_ratios);
449 I915_WRITE(PFIT_CONTROL, intel_lvds->pfit_control);
450 intel_lvds->pfit_dirty = false;
454 * Detect the LVDS connection.
456 * Since LVDS doesn't have hotlug, we use the lid as a proxy. Open means
457 * connected and closed means disconnected. We also send hotplug events as
458 * needed, using lid status notification from the input layer.
460 static enum drm_connector_status
461 intel_lvds_detect(struct drm_connector *connector, bool force)
463 struct drm_device *dev = connector->dev;
464 enum drm_connector_status status = connector_status_connected;
466 /* ACPI lid methods were generally unreliable in this generation, so
469 if (IS_GEN2(dev) || IS_GEN3(dev))
470 return connector_status_connected;
476 * Return the list of DDC modes if available, or the BIOS fixed mode otherwise.
478 static int intel_lvds_get_modes(struct drm_connector *connector)
480 struct intel_lvds *intel_lvds = intel_attached_lvds(connector);
481 struct drm_device *dev = connector->dev;
482 struct drm_display_mode *mode;
484 if (intel_lvds->edid)
485 return drm_add_edid_modes(connector, intel_lvds->edid);
487 mode = drm_mode_duplicate(dev, intel_lvds->fixed_mode);
491 drm_mode_probed_add(connector, mode);
495 static int intel_no_modeset_on_lid_dmi_callback(const struct dmi_system_id *id)
497 DRM_DEBUG_KMS("Skipping forced modeset for %s\n", id->ident);
501 /* The GPU hangs up on these systems if modeset is performed on LID open */
502 static const struct dmi_system_id intel_no_modeset_on_lid[] = {
504 .callback = intel_no_modeset_on_lid_dmi_callback,
505 .ident = "Toshiba Tecra A11",
507 DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"),
508 DMI_MATCH(DMI_PRODUCT_NAME, "TECRA A11"),
512 { } /* terminating entry */
516 * Lid events. Note the use of 'modeset_on_lid':
517 * - we set it on lid close, and reset it on open
518 * - we use it as a "only once" bit (ie we ignore
519 * duplicate events where it was already properly
521 * - the suspend/resume paths will also set it to
522 * zero, since they restore the mode ("lid open").
524 static int intel_lid_notify(struct notifier_block *nb, unsigned long val,
527 struct drm_i915_private *dev_priv =
528 container_of(nb, struct drm_i915_private, lid_notifier);
529 struct drm_device *dev = dev_priv->dev;
530 struct drm_connector *connector = dev_priv->int_lvds_connector;
533 * check and update the status of LVDS connector after receiving
534 * the LID nofication event.
537 connector->status = connector->funcs->detect(connector,
540 /* Don't force modeset on machines where it causes a GPU lockup */
541 if (dmi_check_system(intel_no_modeset_on_lid))
543 if (!acpi_lid_open()) {
544 dev_priv->modeset_on_lid = 1;
548 if (!dev_priv->modeset_on_lid)
551 dev_priv->modeset_on_lid = 0;
553 mutex_lock(&dev->mode_config.mutex);
554 drm_helper_resume_force_mode(dev);
555 mutex_unlock(&dev->mode_config.mutex);
561 * intel_lvds_destroy - unregister and free LVDS structures
562 * @connector: connector to free
564 * Unregister the DDC bus for this connector then free the driver private
567 static void intel_lvds_destroy(struct drm_connector *connector)
569 struct drm_device *dev = connector->dev;
570 struct drm_i915_private *dev_priv = dev->dev_private;
572 if (dev_priv->lid_notifier.notifier_call)
573 acpi_lid_notifier_unregister(&dev_priv->lid_notifier);
574 drm_sysfs_connector_remove(connector);
575 drm_connector_cleanup(connector);
579 static int intel_lvds_set_property(struct drm_connector *connector,
580 struct drm_property *property,
583 struct intel_lvds *intel_lvds = intel_attached_lvds(connector);
584 struct drm_device *dev = connector->dev;
586 if (property == dev->mode_config.scaling_mode_property) {
587 struct drm_crtc *crtc = intel_lvds->base.base.crtc;
589 if (value == DRM_MODE_SCALE_NONE) {
590 DRM_DEBUG_KMS("no scaling not supported\n");
594 if (intel_lvds->fitting_mode == value) {
595 /* the LVDS scaling property is not changed */
598 intel_lvds->fitting_mode = value;
599 if (crtc && crtc->enabled) {
601 * If the CRTC is enabled, the display will be changed
602 * according to the new panel fitting mode.
604 drm_crtc_helper_set_mode(crtc, &crtc->mode,
605 crtc->x, crtc->y, crtc->fb);
612 static const struct drm_encoder_helper_funcs intel_lvds_helper_funcs = {
613 .dpms = intel_lvds_dpms,
614 .mode_fixup = intel_lvds_mode_fixup,
615 .prepare = intel_lvds_prepare,
616 .mode_set = intel_lvds_mode_set,
617 .commit = intel_lvds_commit,
620 static const struct drm_connector_helper_funcs intel_lvds_connector_helper_funcs = {
621 .get_modes = intel_lvds_get_modes,
622 .mode_valid = intel_lvds_mode_valid,
623 .best_encoder = intel_best_encoder,
626 static const struct drm_connector_funcs intel_lvds_connector_funcs = {
627 .dpms = drm_helper_connector_dpms,
628 .detect = intel_lvds_detect,
629 .fill_modes = drm_helper_probe_single_connector_modes,
630 .set_property = intel_lvds_set_property,
631 .destroy = intel_lvds_destroy,
634 static const struct drm_encoder_funcs intel_lvds_enc_funcs = {
635 .destroy = intel_encoder_destroy,
638 static int __init intel_no_lvds_dmi_callback(const struct dmi_system_id *id)
640 DRM_DEBUG_KMS("Skipping LVDS initialization for %s\n", id->ident);
644 /* These systems claim to have LVDS, but really don't */
645 static const struct dmi_system_id intel_no_lvds[] = {
647 .callback = intel_no_lvds_dmi_callback,
648 .ident = "Apple Mac Mini (Core series)",
650 DMI_MATCH(DMI_SYS_VENDOR, "Apple"),
651 DMI_MATCH(DMI_PRODUCT_NAME, "Macmini1,1"),
655 .callback = intel_no_lvds_dmi_callback,
656 .ident = "Apple Mac Mini (Core 2 series)",
658 DMI_MATCH(DMI_SYS_VENDOR, "Apple"),
659 DMI_MATCH(DMI_PRODUCT_NAME, "Macmini2,1"),
663 .callback = intel_no_lvds_dmi_callback,
664 .ident = "MSI IM-945GSE-A",
666 DMI_MATCH(DMI_SYS_VENDOR, "MSI"),
667 DMI_MATCH(DMI_PRODUCT_NAME, "A9830IMS"),
671 .callback = intel_no_lvds_dmi_callback,
672 .ident = "Dell Studio Hybrid",
674 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
675 DMI_MATCH(DMI_PRODUCT_NAME, "Studio Hybrid 140g"),
679 .callback = intel_no_lvds_dmi_callback,
680 .ident = "AOpen Mini PC",
682 DMI_MATCH(DMI_SYS_VENDOR, "AOpen"),
683 DMI_MATCH(DMI_PRODUCT_NAME, "i965GMx-IF"),
687 .callback = intel_no_lvds_dmi_callback,
688 .ident = "AOpen Mini PC MP915",
690 DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"),
691 DMI_MATCH(DMI_BOARD_NAME, "i915GMx-F"),
695 .callback = intel_no_lvds_dmi_callback,
696 .ident = "Aopen i945GTt-VFA",
698 DMI_MATCH(DMI_PRODUCT_VERSION, "AO00001JW"),
702 .callback = intel_no_lvds_dmi_callback,
703 .ident = "Clientron U800",
705 DMI_MATCH(DMI_SYS_VENDOR, "Clientron"),
706 DMI_MATCH(DMI_PRODUCT_NAME, "U800"),
710 { } /* terminating entry */
714 * intel_find_lvds_downclock - find the reduced downclock for LVDS in EDID
716 * @connector: LVDS connector
718 * Find the reduced downclock for LVDS in EDID.
720 static void intel_find_lvds_downclock(struct drm_device *dev,
721 struct drm_display_mode *fixed_mode,
722 struct drm_connector *connector)
724 struct drm_i915_private *dev_priv = dev->dev_private;
725 struct drm_display_mode *scan;
728 temp_downclock = fixed_mode->clock;
729 list_for_each_entry(scan, &connector->probed_modes, head) {
731 * If one mode has the same resolution with the fixed_panel
732 * mode while they have the different refresh rate, it means
733 * that the reduced downclock is found for the LVDS. In such
734 * case we can set the different FPx0/1 to dynamically select
735 * between low and high frequency.
737 if (scan->hdisplay == fixed_mode->hdisplay &&
738 scan->hsync_start == fixed_mode->hsync_start &&
739 scan->hsync_end == fixed_mode->hsync_end &&
740 scan->htotal == fixed_mode->htotal &&
741 scan->vdisplay == fixed_mode->vdisplay &&
742 scan->vsync_start == fixed_mode->vsync_start &&
743 scan->vsync_end == fixed_mode->vsync_end &&
744 scan->vtotal == fixed_mode->vtotal) {
745 if (scan->clock < temp_downclock) {
747 * The downclock is already found. But we
748 * expect to find the lower downclock.
750 temp_downclock = scan->clock;
754 if (temp_downclock < fixed_mode->clock && i915_lvds_downclock) {
755 /* We found the downclock for LVDS. */
756 dev_priv->lvds_downclock_avail = 1;
757 dev_priv->lvds_downclock = temp_downclock;
758 DRM_DEBUG_KMS("LVDS downclock is found in EDID. "
759 "Normal clock %dKhz, downclock %dKhz\n",
760 fixed_mode->clock, temp_downclock);
765 * Enumerate the child dev array parsed from VBT to check whether
766 * the LVDS is present.
767 * If it is present, return 1.
768 * If it is not present, return false.
769 * If no child dev is parsed from VBT, it assumes that the LVDS is present.
771 static bool lvds_is_present_in_vbt(struct drm_device *dev,
774 struct drm_i915_private *dev_priv = dev->dev_private;
777 if (!dev_priv->child_dev_num)
780 for (i = 0; i < dev_priv->child_dev_num; i++) {
781 struct child_device_config *child = dev_priv->child_dev + i;
783 /* If the device type is not LFP, continue.
784 * We have to check both the new identifiers as well as the
785 * old for compatibility with some BIOSes.
787 if (child->device_type != DEVICE_TYPE_INT_LFP &&
788 child->device_type != DEVICE_TYPE_LFP)
792 *i2c_pin = child->i2c_pin;
794 /* However, we cannot trust the BIOS writers to populate
795 * the VBT correctly. Since LVDS requires additional
796 * information from AIM blocks, a non-zero addin offset is
797 * a good indicator that the LVDS is actually present.
799 if (child->addin_offset)
802 /* But even then some BIOS writers perform some black magic
803 * and instantiate the device without reference to any
804 * additional data. Trust that if the VBT was written into
805 * the OpRegion then they have validated the LVDS's existence.
807 if (dev_priv->opregion.vbt)
814 static bool intel_lvds_ddc_probe(struct drm_device *dev, u8 pin)
816 struct drm_i915_private *dev_priv = dev->dev_private;
818 struct i2c_msg msgs[] = {
826 struct i2c_adapter *i2c = &dev_priv->gmbus[pin].adapter;
827 /* XXX this only appears to work when using GMBUS */
828 if (intel_gmbus_is_forced_bit(i2c))
830 return i2c_transfer(i2c, msgs, 1) == 1;
834 * intel_lvds_init - setup LVDS connectors on this device
837 * Create the connector, register the LVDS DDC bus, and try to figure out what
838 * modes we can display on the LVDS panel (if present).
840 bool intel_lvds_init(struct drm_device *dev)
842 struct drm_i915_private *dev_priv = dev->dev_private;
843 struct intel_lvds *intel_lvds;
844 struct intel_encoder *intel_encoder;
845 struct intel_connector *intel_connector;
846 struct drm_connector *connector;
847 struct drm_encoder *encoder;
848 struct drm_display_mode *scan; /* *modes, *bios_mode; */
849 struct drm_crtc *crtc;
854 /* Skip init on machines we know falsely report LVDS */
855 if (dmi_check_system(intel_no_lvds))
858 pin = GMBUS_PORT_PANEL;
859 if (!lvds_is_present_in_vbt(dev, &pin)) {
860 DRM_DEBUG_KMS("LVDS is not present in VBT\n");
864 if (HAS_PCH_SPLIT(dev)) {
865 if ((I915_READ(PCH_LVDS) & LVDS_DETECTED) == 0)
867 if (dev_priv->edp.support) {
868 DRM_DEBUG_KMS("disable LVDS for eDP support\n");
873 if (!intel_lvds_ddc_probe(dev, pin)) {
874 DRM_DEBUG_KMS("LVDS did not respond to DDC probe\n");
878 intel_lvds = kzalloc(sizeof(struct intel_lvds), GFP_KERNEL);
883 intel_connector = kzalloc(sizeof(struct intel_connector), GFP_KERNEL);
884 if (!intel_connector) {
889 if (!HAS_PCH_SPLIT(dev)) {
890 intel_lvds->pfit_control = I915_READ(PFIT_CONTROL);
893 intel_encoder = &intel_lvds->base;
894 encoder = &intel_encoder->base;
895 connector = &intel_connector->base;
896 drm_connector_init(dev, &intel_connector->base, &intel_lvds_connector_funcs,
897 DRM_MODE_CONNECTOR_LVDS);
899 drm_encoder_init(dev, &intel_encoder->base, &intel_lvds_enc_funcs,
900 DRM_MODE_ENCODER_LVDS);
902 intel_connector_attach_encoder(intel_connector, intel_encoder);
903 intel_encoder->type = INTEL_OUTPUT_LVDS;
905 intel_encoder->clone_mask = (1 << INTEL_LVDS_CLONE_BIT);
906 intel_encoder->crtc_mask = (1 << 1);
907 drm_encoder_helper_add(encoder, &intel_lvds_helper_funcs);
908 drm_connector_helper_add(connector, &intel_lvds_connector_helper_funcs);
909 connector->display_info.subpixel_order = SubPixelHorizontalRGB;
910 connector->interlace_allowed = false;
911 connector->doublescan_allowed = false;
913 /* create the scaling mode property */
914 drm_mode_create_scaling_mode_property(dev);
916 * the initial panel fitting mode will be FULL_SCREEN.
919 drm_connector_attach_property(&intel_connector->base,
920 dev->mode_config.scaling_mode_property,
921 DRM_MODE_SCALE_ASPECT);
922 intel_lvds->fitting_mode = DRM_MODE_SCALE_ASPECT;
925 * 1) check for EDID on DDC
926 * 2) check for VBT data
927 * 3) check to see if LVDS is already on
928 * if none of the above, no panel
929 * 4) make sure lid is open
930 * if closed, act like it's not there for now
934 * Attempt to get the fixed panel mode from DDC. Assume that the
935 * preferred mode is the right one.
937 intel_lvds->edid = drm_get_edid(connector,
938 &dev_priv->gmbus[pin].adapter);
939 if (intel_lvds->edid) {
940 if (drm_add_edid_modes(connector,
942 drm_mode_connector_update_edid_property(connector,
945 kfree(intel_lvds->edid);
946 intel_lvds->edid = NULL;
949 if (!intel_lvds->edid) {
950 /* Didn't get an EDID, so
951 * Set wide sync ranges so we get all modes
952 * handed to valid_mode for checking
954 connector->display_info.min_vfreq = 0;
955 connector->display_info.max_vfreq = 200;
956 connector->display_info.min_hfreq = 0;
957 connector->display_info.max_hfreq = 200;
960 list_for_each_entry(scan, &connector->probed_modes, head) {
961 if (scan->type & DRM_MODE_TYPE_PREFERRED) {
962 intel_lvds->fixed_mode =
963 drm_mode_duplicate(dev, scan);
964 intel_find_lvds_downclock(dev,
965 intel_lvds->fixed_mode,
971 /* Failed to get EDID, what about VBT? */
972 if (dev_priv->lfp_lvds_vbt_mode) {
973 intel_lvds->fixed_mode =
974 drm_mode_duplicate(dev, dev_priv->lfp_lvds_vbt_mode);
975 if (intel_lvds->fixed_mode) {
976 intel_lvds->fixed_mode->type |=
977 DRM_MODE_TYPE_PREFERRED;
983 * If we didn't get EDID, try checking if the panel is already turned
984 * on. If so, assume that whatever is currently programmed is the
988 /* Ironlake: FIXME if still fail, not try pipe mode now */
989 if (HAS_PCH_SPLIT(dev))
992 lvds = I915_READ(LVDS);
993 pipe = (lvds & LVDS_PIPEB_SELECT) ? 1 : 0;
994 crtc = intel_get_crtc_for_pipe(dev, pipe);
996 if (crtc && (lvds & LVDS_PORT_EN)) {
997 intel_lvds->fixed_mode = intel_crtc_mode_get(dev, crtc);
998 if (intel_lvds->fixed_mode) {
999 intel_lvds->fixed_mode->type |=
1000 DRM_MODE_TYPE_PREFERRED;
1005 /* If we still don't have a mode after all that, give up. */
1006 if (!intel_lvds->fixed_mode)
1010 if (HAS_PCH_SPLIT(dev)) {
1012 /* make sure PWM is enabled */
1013 pwm = I915_READ(BLC_PWM_CPU_CTL2);
1014 pwm |= (PWM_ENABLE | PWM_PIPE_B);
1015 I915_WRITE(BLC_PWM_CPU_CTL2, pwm);
1017 pwm = I915_READ(BLC_PWM_PCH_CTL1);
1018 pwm |= PWM_PCH_ENABLE;
1019 I915_WRITE(BLC_PWM_PCH_CTL1, pwm);
1021 dev_priv->lid_notifier.notifier_call = intel_lid_notify;
1022 if (acpi_lid_notifier_register(&dev_priv->lid_notifier)) {
1023 DRM_DEBUG_KMS("lid notifier registration failed\n");
1024 dev_priv->lid_notifier.notifier_call = NULL;
1026 /* keep the LVDS connector */
1027 dev_priv->int_lvds_connector = connector;
1028 drm_sysfs_connector_add(connector);
1032 DRM_DEBUG_KMS("No LVDS modes found, disabling.\n");
1033 drm_connector_cleanup(connector);
1034 drm_encoder_cleanup(encoder);
1036 kfree(intel_connector);