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;
51 static struct intel_lvds *enc_to_intel_lvds(struct drm_encoder *encoder)
53 return container_of(enc_to_intel_encoder(encoder), struct intel_lvds, base);
56 static void intel_lvds_lock_panel(struct drm_device *dev, bool lock)
58 struct drm_i915_private *dev_priv = dev->dev_private;
61 I915_WRITE(PP_CONTROL, I915_READ(PP_CONTROL) & 0x3);
63 I915_WRITE(PP_CONTROL, I915_READ(PP_CONTROL) | PANEL_UNLOCK_REGS);
67 * Sets the power state for the panel.
69 static void intel_lvds_set_power(struct drm_device *dev, bool on)
71 struct drm_i915_private *dev_priv = dev->dev_private;
72 u32 ctl_reg, status_reg, lvds_reg;
74 if (HAS_PCH_SPLIT(dev)) {
75 ctl_reg = PCH_PP_CONTROL;
76 status_reg = PCH_PP_STATUS;
80 status_reg = PP_STATUS;
85 I915_WRITE(lvds_reg, I915_READ(lvds_reg) | LVDS_PORT_EN);
86 POSTING_READ(lvds_reg);
88 I915_WRITE(ctl_reg, I915_READ(ctl_reg) |
90 if (wait_for(I915_READ(status_reg) & PP_ON, 1000))
91 DRM_ERROR("timed out waiting to enable LVDS pipe");
93 intel_panel_set_backlight(dev, dev_priv->backlight_level);
95 intel_panel_set_backlight(dev, 0);
97 I915_WRITE(ctl_reg, I915_READ(ctl_reg) &
99 if (wait_for((I915_READ(status_reg) & PP_ON) == 0, 1000))
100 DRM_ERROR("timed out waiting for LVDS pipe to turn off");
102 I915_WRITE(lvds_reg, I915_READ(lvds_reg) & ~LVDS_PORT_EN);
103 POSTING_READ(lvds_reg);
107 static void intel_lvds_dpms(struct drm_encoder *encoder, int mode)
109 struct drm_device *dev = encoder->dev;
111 if (mode == DRM_MODE_DPMS_ON)
112 intel_lvds_set_power(dev, true);
114 intel_lvds_set_power(dev, false);
116 /* XXX: We never power down the LVDS pairs. */
119 static int intel_lvds_mode_valid(struct drm_connector *connector,
120 struct drm_display_mode *mode)
122 struct drm_device *dev = connector->dev;
123 struct drm_i915_private *dev_priv = dev->dev_private;
124 struct drm_display_mode *fixed_mode = dev_priv->panel_fixed_mode;
127 if (mode->hdisplay > fixed_mode->hdisplay)
129 if (mode->vdisplay > fixed_mode->vdisplay)
137 centre_horizontally(struct drm_display_mode *mode,
140 u32 border, sync_pos, blank_width, sync_width;
142 /* keep the hsync and hblank widths constant */
143 sync_width = mode->crtc_hsync_end - mode->crtc_hsync_start;
144 blank_width = mode->crtc_hblank_end - mode->crtc_hblank_start;
145 sync_pos = (blank_width - sync_width + 1) / 2;
147 border = (mode->hdisplay - width + 1) / 2;
148 border += border & 1; /* make the border even */
150 mode->crtc_hdisplay = width;
151 mode->crtc_hblank_start = width + border;
152 mode->crtc_hblank_end = mode->crtc_hblank_start + blank_width;
154 mode->crtc_hsync_start = mode->crtc_hblank_start + sync_pos;
155 mode->crtc_hsync_end = mode->crtc_hsync_start + sync_width;
159 centre_vertically(struct drm_display_mode *mode,
162 u32 border, sync_pos, blank_width, sync_width;
164 /* keep the vsync and vblank widths constant */
165 sync_width = mode->crtc_vsync_end - mode->crtc_vsync_start;
166 blank_width = mode->crtc_vblank_end - mode->crtc_vblank_start;
167 sync_pos = (blank_width - sync_width + 1) / 2;
169 border = (mode->vdisplay - height + 1) / 2;
171 mode->crtc_vdisplay = height;
172 mode->crtc_vblank_start = height + border;
173 mode->crtc_vblank_end = mode->crtc_vblank_start + blank_width;
175 mode->crtc_vsync_start = mode->crtc_vblank_start + sync_pos;
176 mode->crtc_vsync_end = mode->crtc_vsync_start + sync_width;
179 static inline u32 panel_fitter_scaling(u32 source, u32 target)
182 * Floating point operation is not supported. So the FACTOR
183 * is defined, which can avoid the floating point computation
184 * when calculating the panel ratio.
187 #define FACTOR (1 << ACCURACY)
188 u32 ratio = source * FACTOR / target;
189 return (FACTOR * ratio + FACTOR/2) / FACTOR;
192 static bool intel_lvds_mode_fixup(struct drm_encoder *encoder,
193 struct drm_display_mode *mode,
194 struct drm_display_mode *adjusted_mode)
196 struct drm_device *dev = encoder->dev;
197 struct drm_i915_private *dev_priv = dev->dev_private;
198 struct intel_crtc *intel_crtc = to_intel_crtc(encoder->crtc);
199 struct intel_lvds *intel_lvds = enc_to_intel_lvds(encoder);
200 struct drm_encoder *tmp_encoder;
201 u32 pfit_control = 0, pfit_pgm_ratios = 0, border = 0;
203 /* Should never happen!! */
204 if (!IS_I965G(dev) && intel_crtc->pipe == 0) {
205 DRM_ERROR("Can't support LVDS on pipe A\n");
209 /* Should never happen!! */
210 list_for_each_entry(tmp_encoder, &dev->mode_config.encoder_list, head) {
211 if (tmp_encoder != encoder && tmp_encoder->crtc == encoder->crtc) {
212 DRM_ERROR("Can't enable LVDS and another "
213 "encoder on the same pipe\n");
217 /* If we don't have a panel mode, there is nothing we can do */
218 if (dev_priv->panel_fixed_mode == NULL)
222 * We have timings from the BIOS for the panel, put them in
223 * to the adjusted mode. The CRTC will be set up for this mode,
224 * with the panel scaling set up to source from the H/VDisplay
225 * of the original mode.
227 intel_fixed_panel_mode(dev_priv->panel_fixed_mode, adjusted_mode);
229 if (HAS_PCH_SPLIT(dev)) {
230 intel_pch_panel_fitting(dev, intel_lvds->fitting_mode,
231 mode, adjusted_mode);
235 /* Make sure pre-965s set dither correctly */
236 if (!IS_I965G(dev)) {
237 if (dev_priv->panel_wants_dither || dev_priv->lvds_dither)
238 pfit_control |= PANEL_8TO6_DITHER_ENABLE;
241 /* Native modes don't need fitting */
242 if (adjusted_mode->hdisplay == mode->hdisplay &&
243 adjusted_mode->vdisplay == mode->vdisplay)
246 /* 965+ wants fuzzy fitting */
248 pfit_control |= ((intel_crtc->pipe << PFIT_PIPE_SHIFT) |
252 * Enable automatic panel scaling for non-native modes so that they fill
253 * the screen. Should be enabled before the pipe is enabled, according
254 * to register description and PRM.
255 * Change the value here to see the borders for debugging
257 I915_WRITE(BCLRPAT_A, 0);
258 I915_WRITE(BCLRPAT_B, 0);
260 switch (intel_lvds->fitting_mode) {
261 case DRM_MODE_SCALE_CENTER:
263 * For centered modes, we have to calculate border widths &
264 * heights and modify the values programmed into the CRTC.
266 centre_horizontally(adjusted_mode, mode->hdisplay);
267 centre_vertically(adjusted_mode, mode->vdisplay);
268 border = LVDS_BORDER_ENABLE;
271 case DRM_MODE_SCALE_ASPECT:
272 /* Scale but preserve the aspect ratio */
274 u32 scaled_width = adjusted_mode->hdisplay * mode->vdisplay;
275 u32 scaled_height = mode->hdisplay * adjusted_mode->vdisplay;
277 pfit_control |= PFIT_ENABLE;
278 /* 965+ is easy, it does everything in hw */
279 if (scaled_width > scaled_height)
280 pfit_control |= PFIT_SCALING_PILLAR;
281 else if (scaled_width < scaled_height)
282 pfit_control |= PFIT_SCALING_LETTER;
284 pfit_control |= PFIT_SCALING_AUTO;
286 u32 scaled_width = adjusted_mode->hdisplay * mode->vdisplay;
287 u32 scaled_height = mode->hdisplay * adjusted_mode->vdisplay;
289 * For earlier chips we have to calculate the scaling
290 * ratio by hand and program it into the
291 * PFIT_PGM_RATIO register
293 if (scaled_width > scaled_height) { /* pillar */
294 centre_horizontally(adjusted_mode, scaled_height / mode->vdisplay);
296 border = LVDS_BORDER_ENABLE;
297 if (mode->vdisplay != adjusted_mode->vdisplay) {
298 u32 bits = panel_fitter_scaling(mode->vdisplay, adjusted_mode->vdisplay);
299 pfit_pgm_ratios |= (bits << PFIT_HORIZ_SCALE_SHIFT |
300 bits << PFIT_VERT_SCALE_SHIFT);
301 pfit_control |= (PFIT_ENABLE |
302 VERT_INTERP_BILINEAR |
303 HORIZ_INTERP_BILINEAR);
305 } else if (scaled_width < scaled_height) { /* letter */
306 centre_vertically(adjusted_mode, scaled_width / mode->hdisplay);
308 border = LVDS_BORDER_ENABLE;
309 if (mode->hdisplay != adjusted_mode->hdisplay) {
310 u32 bits = panel_fitter_scaling(mode->hdisplay, adjusted_mode->hdisplay);
311 pfit_pgm_ratios |= (bits << PFIT_HORIZ_SCALE_SHIFT |
312 bits << PFIT_VERT_SCALE_SHIFT);
313 pfit_control |= (PFIT_ENABLE |
314 VERT_INTERP_BILINEAR |
315 HORIZ_INTERP_BILINEAR);
318 /* Aspects match, Let hw scale both directions */
319 pfit_control |= (PFIT_ENABLE |
320 VERT_AUTO_SCALE | HORIZ_AUTO_SCALE |
321 VERT_INTERP_BILINEAR |
322 HORIZ_INTERP_BILINEAR);
326 case DRM_MODE_SCALE_FULLSCREEN:
328 * Full scaling, even if it changes the aspect ratio.
329 * Fortunately this is all done for us in hw.
331 pfit_control |= PFIT_ENABLE;
333 pfit_control |= PFIT_SCALING_AUTO;
335 pfit_control |= (VERT_AUTO_SCALE | HORIZ_AUTO_SCALE |
336 VERT_INTERP_BILINEAR |
337 HORIZ_INTERP_BILINEAR);
345 intel_lvds->pfit_control = pfit_control;
346 intel_lvds->pfit_pgm_ratios = pfit_pgm_ratios;
347 dev_priv->lvds_border_bits = border;
350 * XXX: It would be nice to support lower refresh rates on the
351 * panels to reduce power consumption, and perhaps match the
352 * user's requested refresh rate.
358 static void intel_lvds_prepare(struct drm_encoder *encoder)
360 struct drm_device *dev = encoder->dev;
361 struct drm_i915_private *dev_priv = dev->dev_private;
362 struct intel_lvds *intel_lvds = enc_to_intel_lvds(encoder);
364 dev_priv->backlight_level = intel_panel_get_backlight(dev);
366 if (intel_lvds->pfit_control == I915_READ(PFIT_CONTROL))
367 intel_lvds_lock_panel(dev, false);
369 intel_lvds_set_power(dev, false);
372 static void intel_lvds_commit( struct drm_encoder *encoder)
374 struct drm_device *dev = encoder->dev;
375 struct drm_i915_private *dev_priv = dev->dev_private;
377 if (dev_priv->backlight_level == 0)
378 dev_priv->backlight_level = intel_panel_get_max_backlight(dev);
380 if ((I915_READ(PP_CONTROL) & PANEL_UNLOCK_REGS) == PANEL_UNLOCK_REGS)
381 intel_lvds_lock_panel(dev, true);
383 intel_lvds_set_power(dev, true);
386 static void intel_lvds_mode_set(struct drm_encoder *encoder,
387 struct drm_display_mode *mode,
388 struct drm_display_mode *adjusted_mode)
390 struct drm_device *dev = encoder->dev;
391 struct drm_i915_private *dev_priv = dev->dev_private;
392 struct intel_lvds *intel_lvds = enc_to_intel_lvds(encoder);
395 * The LVDS pin pair will already have been turned on in the
396 * intel_crtc_mode_set since it has a large impact on the DPLL
400 if (HAS_PCH_SPLIT(dev))
404 * Enable automatic panel scaling so that non-native modes fill the
405 * screen. Should be enabled before the pipe is enabled, according to
406 * register description and PRM.
408 I915_WRITE(PFIT_PGM_RATIOS, intel_lvds->pfit_pgm_ratios);
409 I915_WRITE(PFIT_CONTROL, intel_lvds->pfit_control);
413 * Detect the LVDS connection.
415 * Since LVDS doesn't have hotlug, we use the lid as a proxy. Open means
416 * connected and closed means disconnected. We also send hotplug events as
417 * needed, using lid status notification from the input layer.
419 static enum drm_connector_status intel_lvds_detect(struct drm_connector *connector)
421 struct drm_device *dev = connector->dev;
422 enum drm_connector_status status = connector_status_connected;
424 /* ACPI lid methods were generally unreliable in this generation, so
427 if (IS_GEN2(dev) || IS_GEN3(dev))
428 return connector_status_connected;
434 * Return the list of DDC modes if available, or the BIOS fixed mode otherwise.
436 static int intel_lvds_get_modes(struct drm_connector *connector)
438 struct drm_device *dev = connector->dev;
439 struct drm_encoder *encoder = intel_attached_encoder(connector);
440 struct intel_encoder *intel_encoder = enc_to_intel_encoder(encoder);
441 struct drm_i915_private *dev_priv = dev->dev_private;
444 if (dev_priv->lvds_edid_good) {
445 ret = intel_ddc_get_modes(connector, intel_encoder->ddc_bus);
451 /* Didn't get an EDID, so
452 * Set wide sync ranges so we get all modes
453 * handed to valid_mode for checking
455 connector->display_info.min_vfreq = 0;
456 connector->display_info.max_vfreq = 200;
457 connector->display_info.min_hfreq = 0;
458 connector->display_info.max_hfreq = 200;
460 if (dev_priv->panel_fixed_mode != NULL) {
461 struct drm_display_mode *mode;
463 mode = drm_mode_duplicate(dev, dev_priv->panel_fixed_mode);
464 drm_mode_probed_add(connector, mode);
472 static int intel_no_modeset_on_lid_dmi_callback(const struct dmi_system_id *id)
474 DRM_DEBUG_KMS("Skipping forced modeset for %s\n", id->ident);
478 /* The GPU hangs up on these systems if modeset is performed on LID open */
479 static const struct dmi_system_id intel_no_modeset_on_lid[] = {
481 .callback = intel_no_modeset_on_lid_dmi_callback,
482 .ident = "Toshiba Tecra A11",
484 DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"),
485 DMI_MATCH(DMI_PRODUCT_NAME, "TECRA A11"),
489 { } /* terminating entry */
493 * Lid events. Note the use of 'modeset_on_lid':
494 * - we set it on lid close, and reset it on open
495 * - we use it as a "only once" bit (ie we ignore
496 * duplicate events where it was already properly
498 * - the suspend/resume paths will also set it to
499 * zero, since they restore the mode ("lid open").
501 static int intel_lid_notify(struct notifier_block *nb, unsigned long val,
504 struct drm_i915_private *dev_priv =
505 container_of(nb, struct drm_i915_private, lid_notifier);
506 struct drm_device *dev = dev_priv->dev;
507 struct drm_connector *connector = dev_priv->int_lvds_connector;
510 * check and update the status of LVDS connector after receiving
511 * the LID nofication event.
514 connector->status = connector->funcs->detect(connector);
515 /* Don't force modeset on machines where it causes a GPU lockup */
516 if (dmi_check_system(intel_no_modeset_on_lid))
518 if (!acpi_lid_open()) {
519 dev_priv->modeset_on_lid = 1;
523 if (!dev_priv->modeset_on_lid)
526 dev_priv->modeset_on_lid = 0;
528 mutex_lock(&dev->mode_config.mutex);
529 drm_helper_resume_force_mode(dev);
530 mutex_unlock(&dev->mode_config.mutex);
536 * intel_lvds_destroy - unregister and free LVDS structures
537 * @connector: connector to free
539 * Unregister the DDC bus for this connector then free the driver private
542 static void intel_lvds_destroy(struct drm_connector *connector)
544 struct drm_device *dev = connector->dev;
545 struct drm_i915_private *dev_priv = dev->dev_private;
547 if (dev_priv->lid_notifier.notifier_call)
548 acpi_lid_notifier_unregister(&dev_priv->lid_notifier);
549 drm_sysfs_connector_remove(connector);
550 drm_connector_cleanup(connector);
554 static int intel_lvds_set_property(struct drm_connector *connector,
555 struct drm_property *property,
558 struct drm_device *dev = connector->dev;
560 if (property == dev->mode_config.scaling_mode_property &&
561 connector->encoder) {
562 struct drm_crtc *crtc = connector->encoder->crtc;
563 struct drm_encoder *encoder = connector->encoder;
564 struct intel_lvds *intel_lvds = enc_to_intel_lvds(encoder);
566 if (value == DRM_MODE_SCALE_NONE) {
567 DRM_DEBUG_KMS("no scaling not supported\n");
570 if (intel_lvds->fitting_mode == value) {
571 /* the LVDS scaling property is not changed */
574 intel_lvds->fitting_mode = value;
575 if (crtc && crtc->enabled) {
577 * If the CRTC is enabled, the display will be changed
578 * according to the new panel fitting mode.
580 drm_crtc_helper_set_mode(crtc, &crtc->mode,
581 crtc->x, crtc->y, crtc->fb);
588 static const struct drm_encoder_helper_funcs intel_lvds_helper_funcs = {
589 .dpms = intel_lvds_dpms,
590 .mode_fixup = intel_lvds_mode_fixup,
591 .prepare = intel_lvds_prepare,
592 .mode_set = intel_lvds_mode_set,
593 .commit = intel_lvds_commit,
596 static const struct drm_connector_helper_funcs intel_lvds_connector_helper_funcs = {
597 .get_modes = intel_lvds_get_modes,
598 .mode_valid = intel_lvds_mode_valid,
599 .best_encoder = intel_attached_encoder,
602 static const struct drm_connector_funcs intel_lvds_connector_funcs = {
603 .dpms = drm_helper_connector_dpms,
604 .detect = intel_lvds_detect,
605 .fill_modes = drm_helper_probe_single_connector_modes,
606 .set_property = intel_lvds_set_property,
607 .destroy = intel_lvds_destroy,
610 static const struct drm_encoder_funcs intel_lvds_enc_funcs = {
611 .destroy = intel_encoder_destroy,
614 static int __init intel_no_lvds_dmi_callback(const struct dmi_system_id *id)
616 DRM_DEBUG_KMS("Skipping LVDS initialization for %s\n", id->ident);
620 /* These systems claim to have LVDS, but really don't */
621 static const struct dmi_system_id intel_no_lvds[] = {
623 .callback = intel_no_lvds_dmi_callback,
624 .ident = "Apple Mac Mini (Core series)",
626 DMI_MATCH(DMI_SYS_VENDOR, "Apple"),
627 DMI_MATCH(DMI_PRODUCT_NAME, "Macmini1,1"),
631 .callback = intel_no_lvds_dmi_callback,
632 .ident = "Apple Mac Mini (Core 2 series)",
634 DMI_MATCH(DMI_SYS_VENDOR, "Apple"),
635 DMI_MATCH(DMI_PRODUCT_NAME, "Macmini2,1"),
639 .callback = intel_no_lvds_dmi_callback,
640 .ident = "MSI IM-945GSE-A",
642 DMI_MATCH(DMI_SYS_VENDOR, "MSI"),
643 DMI_MATCH(DMI_PRODUCT_NAME, "A9830IMS"),
647 .callback = intel_no_lvds_dmi_callback,
648 .ident = "Dell Studio Hybrid",
650 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
651 DMI_MATCH(DMI_PRODUCT_NAME, "Studio Hybrid 140g"),
655 .callback = intel_no_lvds_dmi_callback,
656 .ident = "AOpen Mini PC",
658 DMI_MATCH(DMI_SYS_VENDOR, "AOpen"),
659 DMI_MATCH(DMI_PRODUCT_NAME, "i965GMx-IF"),
663 .callback = intel_no_lvds_dmi_callback,
664 .ident = "AOpen Mini PC MP915",
666 DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"),
667 DMI_MATCH(DMI_BOARD_NAME, "i915GMx-F"),
671 .callback = intel_no_lvds_dmi_callback,
672 .ident = "Aopen i945GTt-VFA",
674 DMI_MATCH(DMI_PRODUCT_VERSION, "AO00001JW"),
678 .callback = intel_no_lvds_dmi_callback,
679 .ident = "Clientron U800",
681 DMI_MATCH(DMI_SYS_VENDOR, "Clientron"),
682 DMI_MATCH(DMI_PRODUCT_NAME, "U800"),
686 { } /* terminating entry */
690 * intel_find_lvds_downclock - find the reduced downclock for LVDS in EDID
692 * @connector: LVDS connector
694 * Find the reduced downclock for LVDS in EDID.
696 static void intel_find_lvds_downclock(struct drm_device *dev,
697 struct drm_connector *connector)
699 struct drm_i915_private *dev_priv = dev->dev_private;
700 struct drm_display_mode *scan, *panel_fixed_mode;
703 panel_fixed_mode = dev_priv->panel_fixed_mode;
704 temp_downclock = panel_fixed_mode->clock;
706 mutex_lock(&dev->mode_config.mutex);
707 list_for_each_entry(scan, &connector->probed_modes, head) {
709 * If one mode has the same resolution with the fixed_panel
710 * mode while they have the different refresh rate, it means
711 * that the reduced downclock is found for the LVDS. In such
712 * case we can set the different FPx0/1 to dynamically select
713 * between low and high frequency.
715 if (scan->hdisplay == panel_fixed_mode->hdisplay &&
716 scan->hsync_start == panel_fixed_mode->hsync_start &&
717 scan->hsync_end == panel_fixed_mode->hsync_end &&
718 scan->htotal == panel_fixed_mode->htotal &&
719 scan->vdisplay == panel_fixed_mode->vdisplay &&
720 scan->vsync_start == panel_fixed_mode->vsync_start &&
721 scan->vsync_end == panel_fixed_mode->vsync_end &&
722 scan->vtotal == panel_fixed_mode->vtotal) {
723 if (scan->clock < temp_downclock) {
725 * The downclock is already found. But we
726 * expect to find the lower downclock.
728 temp_downclock = scan->clock;
732 mutex_unlock(&dev->mode_config.mutex);
733 if (temp_downclock < panel_fixed_mode->clock &&
734 i915_lvds_downclock) {
735 /* We found the downclock for LVDS. */
736 dev_priv->lvds_downclock_avail = 1;
737 dev_priv->lvds_downclock = temp_downclock;
738 DRM_DEBUG_KMS("LVDS downclock is found in EDID. "
739 "Normal clock %dKhz, downclock %dKhz\n",
740 panel_fixed_mode->clock, temp_downclock);
746 * Enumerate the child dev array parsed from VBT to check whether
747 * the LVDS is present.
748 * If it is present, return 1.
749 * If it is not present, return false.
750 * If no child dev is parsed from VBT, it assumes that the LVDS is present.
752 static bool lvds_is_present_in_vbt(struct drm_device *dev)
754 struct drm_i915_private *dev_priv = dev->dev_private;
757 if (!dev_priv->child_dev_num)
760 for (i = 0; i < dev_priv->child_dev_num; i++) {
761 struct child_device_config *child = dev_priv->child_dev + i;
763 /* If the device type is not LFP, continue.
764 * We have to check both the new identifiers as well as the
765 * old for compatibility with some BIOSes.
767 if (child->device_type != DEVICE_TYPE_INT_LFP &&
768 child->device_type != DEVICE_TYPE_LFP)
771 /* However, we cannot trust the BIOS writers to populate
772 * the VBT correctly. Since LVDS requires additional
773 * information from AIM blocks, a non-zero addin offset is
774 * a good indicator that the LVDS is actually present.
776 if (child->addin_offset)
779 /* But even then some BIOS writers perform some black magic
780 * and instantiate the device without reference to any
781 * additional data. Trust that if the VBT was written into
782 * the OpRegion then they have validated the LVDS's existence.
784 if (dev_priv->opregion.vbt)
792 * intel_lvds_init - setup LVDS connectors on this device
795 * Create the connector, register the LVDS DDC bus, and try to figure out what
796 * modes we can display on the LVDS panel (if present).
798 void intel_lvds_init(struct drm_device *dev)
800 struct drm_i915_private *dev_priv = dev->dev_private;
801 struct intel_lvds *intel_lvds;
802 struct intel_encoder *intel_encoder;
803 struct intel_connector *intel_connector;
804 struct drm_connector *connector;
805 struct drm_encoder *encoder;
806 struct drm_display_mode *scan; /* *modes, *bios_mode; */
807 struct drm_crtc *crtc;
809 int pipe, gpio = GPIOC;
811 /* Skip init on machines we know falsely report LVDS */
812 if (dmi_check_system(intel_no_lvds))
815 if (!lvds_is_present_in_vbt(dev)) {
816 DRM_DEBUG_KMS("LVDS is not present in VBT\n");
820 if (HAS_PCH_SPLIT(dev)) {
821 if ((I915_READ(PCH_LVDS) & LVDS_DETECTED) == 0)
823 if (dev_priv->edp_support) {
824 DRM_DEBUG_KMS("disable LVDS for eDP support\n");
830 intel_lvds = kzalloc(sizeof(struct intel_lvds), GFP_KERNEL);
835 intel_connector = kzalloc(sizeof(struct intel_connector), GFP_KERNEL);
836 if (!intel_connector) {
841 intel_encoder = &intel_lvds->base;
842 encoder = &intel_encoder->enc;
843 connector = &intel_connector->base;
844 drm_connector_init(dev, &intel_connector->base, &intel_lvds_connector_funcs,
845 DRM_MODE_CONNECTOR_LVDS);
847 drm_encoder_init(dev, &intel_encoder->enc, &intel_lvds_enc_funcs,
848 DRM_MODE_ENCODER_LVDS);
850 drm_mode_connector_attach_encoder(&intel_connector->base, &intel_encoder->enc);
851 intel_encoder->type = INTEL_OUTPUT_LVDS;
853 intel_encoder->clone_mask = (1 << INTEL_LVDS_CLONE_BIT);
854 intel_encoder->crtc_mask = (1 << 1);
855 drm_encoder_helper_add(encoder, &intel_lvds_helper_funcs);
856 drm_connector_helper_add(connector, &intel_lvds_connector_helper_funcs);
857 connector->display_info.subpixel_order = SubPixelHorizontalRGB;
858 connector->interlace_allowed = false;
859 connector->doublescan_allowed = false;
861 /* create the scaling mode property */
862 drm_mode_create_scaling_mode_property(dev);
864 * the initial panel fitting mode will be FULL_SCREEN.
867 drm_connector_attach_property(&intel_connector->base,
868 dev->mode_config.scaling_mode_property,
869 DRM_MODE_SCALE_ASPECT);
870 intel_lvds->fitting_mode = DRM_MODE_SCALE_ASPECT;
873 * 1) check for EDID on DDC
874 * 2) check for VBT data
875 * 3) check to see if LVDS is already on
876 * if none of the above, no panel
877 * 4) make sure lid is open
878 * if closed, act like it's not there for now
881 /* Set up the DDC bus. */
882 intel_encoder->ddc_bus = intel_i2c_create(dev, gpio, "LVDSDDC_C");
883 if (!intel_encoder->ddc_bus) {
884 dev_printk(KERN_ERR, &dev->pdev->dev, "DDC bus registration "
890 * Attempt to get the fixed panel mode from DDC. Assume that the
891 * preferred mode is the right one.
893 dev_priv->lvds_edid_good = true;
895 if (!intel_ddc_get_modes(connector, intel_encoder->ddc_bus))
896 dev_priv->lvds_edid_good = false;
898 list_for_each_entry(scan, &connector->probed_modes, head) {
899 mutex_lock(&dev->mode_config.mutex);
900 if (scan->type & DRM_MODE_TYPE_PREFERRED) {
901 dev_priv->panel_fixed_mode =
902 drm_mode_duplicate(dev, scan);
903 mutex_unlock(&dev->mode_config.mutex);
904 intel_find_lvds_downclock(dev, connector);
907 mutex_unlock(&dev->mode_config.mutex);
910 /* Failed to get EDID, what about VBT? */
911 if (dev_priv->lfp_lvds_vbt_mode) {
912 mutex_lock(&dev->mode_config.mutex);
913 dev_priv->panel_fixed_mode =
914 drm_mode_duplicate(dev, dev_priv->lfp_lvds_vbt_mode);
915 mutex_unlock(&dev->mode_config.mutex);
916 if (dev_priv->panel_fixed_mode) {
917 dev_priv->panel_fixed_mode->type |=
918 DRM_MODE_TYPE_PREFERRED;
924 * If we didn't get EDID, try checking if the panel is already turned
925 * on. If so, assume that whatever is currently programmed is the
929 /* Ironlake: FIXME if still fail, not try pipe mode now */
930 if (HAS_PCH_SPLIT(dev))
933 lvds = I915_READ(LVDS);
934 pipe = (lvds & LVDS_PIPEB_SELECT) ? 1 : 0;
935 crtc = intel_get_crtc_from_pipe(dev, pipe);
937 if (crtc && (lvds & LVDS_PORT_EN)) {
938 dev_priv->panel_fixed_mode = intel_crtc_mode_get(dev, crtc);
939 if (dev_priv->panel_fixed_mode) {
940 dev_priv->panel_fixed_mode->type |=
941 DRM_MODE_TYPE_PREFERRED;
946 /* If we still don't have a mode after all that, give up. */
947 if (!dev_priv->panel_fixed_mode)
951 if (HAS_PCH_SPLIT(dev)) {
953 /* make sure PWM is enabled */
954 pwm = I915_READ(BLC_PWM_CPU_CTL2);
955 pwm |= (PWM_ENABLE | PWM_PIPE_B);
956 I915_WRITE(BLC_PWM_CPU_CTL2, pwm);
958 pwm = I915_READ(BLC_PWM_PCH_CTL1);
959 pwm |= PWM_PCH_ENABLE;
960 I915_WRITE(BLC_PWM_PCH_CTL1, pwm);
962 dev_priv->lid_notifier.notifier_call = intel_lid_notify;
963 if (acpi_lid_notifier_register(&dev_priv->lid_notifier)) {
964 DRM_DEBUG_KMS("lid notifier registration failed\n");
965 dev_priv->lid_notifier.notifier_call = NULL;
967 /* keep the LVDS connector */
968 dev_priv->int_lvds_connector = connector;
969 drm_sysfs_connector_add(connector);
973 DRM_DEBUG_KMS("No LVDS modes found, disabling.\n");
974 if (intel_encoder->ddc_bus)
975 intel_i2c_destroy(intel_encoder->ddc_bus);
976 drm_connector_cleanup(connector);
977 drm_encoder_cleanup(encoder);
979 kfree(intel_connector);