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;
52 static struct intel_lvds *enc_to_intel_lvds(struct drm_encoder *encoder)
54 return container_of(encoder, struct intel_lvds, base.base);
58 * Sets the power state for the panel.
60 static void intel_lvds_set_power(struct intel_lvds *intel_lvds, bool on)
62 struct drm_device *dev = intel_lvds->base.base.dev;
63 struct drm_i915_private *dev_priv = dev->dev_private;
64 u32 ctl_reg, lvds_reg;
66 if (HAS_PCH_SPLIT(dev)) {
67 ctl_reg = PCH_PP_CONTROL;
75 I915_WRITE(lvds_reg, I915_READ(lvds_reg) | LVDS_PORT_EN);
76 I915_WRITE(ctl_reg, I915_READ(ctl_reg) | POWER_TARGET_ON);
77 intel_panel_set_backlight(dev, dev_priv->backlight_level);
79 dev_priv->backlight_level = intel_panel_get_backlight(dev);
81 intel_panel_set_backlight(dev, 0);
82 I915_WRITE(ctl_reg, I915_READ(ctl_reg) & ~POWER_TARGET_ON);
84 if (intel_lvds->pfit_control) {
85 if (wait_for((I915_READ(PP_STATUS) & PP_ON) == 0, 1000))
86 DRM_ERROR("timed out waiting for panel to power off\n");
87 I915_WRITE(PFIT_CONTROL, 0);
88 intel_lvds->pfit_control = 0;
91 I915_WRITE(lvds_reg, I915_READ(lvds_reg) & ~LVDS_PORT_EN);
93 POSTING_READ(lvds_reg);
96 static void intel_lvds_dpms(struct drm_encoder *encoder, int mode)
98 struct intel_lvds *intel_lvds = enc_to_intel_lvds(encoder);
100 if (mode == DRM_MODE_DPMS_ON)
101 intel_lvds_set_power(intel_lvds, true);
103 intel_lvds_set_power(intel_lvds, false);
105 /* XXX: We never power down the LVDS pairs. */
108 static int intel_lvds_mode_valid(struct drm_connector *connector,
109 struct drm_display_mode *mode)
111 struct drm_device *dev = connector->dev;
112 struct drm_i915_private *dev_priv = dev->dev_private;
113 struct drm_display_mode *fixed_mode = dev_priv->panel_fixed_mode;
116 if (mode->hdisplay > fixed_mode->hdisplay)
118 if (mode->vdisplay > fixed_mode->vdisplay)
126 centre_horizontally(struct drm_display_mode *mode,
129 u32 border, sync_pos, blank_width, sync_width;
131 /* keep the hsync and hblank widths constant */
132 sync_width = mode->crtc_hsync_end - mode->crtc_hsync_start;
133 blank_width = mode->crtc_hblank_end - mode->crtc_hblank_start;
134 sync_pos = (blank_width - sync_width + 1) / 2;
136 border = (mode->hdisplay - width + 1) / 2;
137 border += border & 1; /* make the border even */
139 mode->crtc_hdisplay = width;
140 mode->crtc_hblank_start = width + border;
141 mode->crtc_hblank_end = mode->crtc_hblank_start + blank_width;
143 mode->crtc_hsync_start = mode->crtc_hblank_start + sync_pos;
144 mode->crtc_hsync_end = mode->crtc_hsync_start + sync_width;
148 centre_vertically(struct drm_display_mode *mode,
151 u32 border, sync_pos, blank_width, sync_width;
153 /* keep the vsync and vblank widths constant */
154 sync_width = mode->crtc_vsync_end - mode->crtc_vsync_start;
155 blank_width = mode->crtc_vblank_end - mode->crtc_vblank_start;
156 sync_pos = (blank_width - sync_width + 1) / 2;
158 border = (mode->vdisplay - height + 1) / 2;
160 mode->crtc_vdisplay = height;
161 mode->crtc_vblank_start = height + border;
162 mode->crtc_vblank_end = mode->crtc_vblank_start + blank_width;
164 mode->crtc_vsync_start = mode->crtc_vblank_start + sync_pos;
165 mode->crtc_vsync_end = mode->crtc_vsync_start + sync_width;
168 static inline u32 panel_fitter_scaling(u32 source, u32 target)
171 * Floating point operation is not supported. So the FACTOR
172 * is defined, which can avoid the floating point computation
173 * when calculating the panel ratio.
176 #define FACTOR (1 << ACCURACY)
177 u32 ratio = source * FACTOR / target;
178 return (FACTOR * ratio + FACTOR/2) / FACTOR;
181 static bool intel_lvds_mode_fixup(struct drm_encoder *encoder,
182 struct drm_display_mode *mode,
183 struct drm_display_mode *adjusted_mode)
185 struct drm_device *dev = encoder->dev;
186 struct drm_i915_private *dev_priv = dev->dev_private;
187 struct intel_crtc *intel_crtc = to_intel_crtc(encoder->crtc);
188 struct intel_lvds *intel_lvds = enc_to_intel_lvds(encoder);
189 struct drm_encoder *tmp_encoder;
190 u32 pfit_control = 0, pfit_pgm_ratios = 0, border = 0;
192 /* Should never happen!! */
193 if (!IS_I965G(dev) && intel_crtc->pipe == 0) {
194 DRM_ERROR("Can't support LVDS on pipe A\n");
198 /* Should never happen!! */
199 list_for_each_entry(tmp_encoder, &dev->mode_config.encoder_list, head) {
200 if (tmp_encoder != encoder && tmp_encoder->crtc == encoder->crtc) {
201 DRM_ERROR("Can't enable LVDS and another "
202 "encoder on the same pipe\n");
206 /* If we don't have a panel mode, there is nothing we can do */
207 if (dev_priv->panel_fixed_mode == NULL)
211 * We have timings from the BIOS for the panel, put them in
212 * to the adjusted mode. The CRTC will be set up for this mode,
213 * with the panel scaling set up to source from the H/VDisplay
214 * of the original mode.
216 intel_fixed_panel_mode(dev_priv->panel_fixed_mode, adjusted_mode);
218 if (HAS_PCH_SPLIT(dev)) {
219 intel_pch_panel_fitting(dev, intel_lvds->fitting_mode,
220 mode, adjusted_mode);
224 /* Make sure pre-965s set dither correctly */
225 if (!IS_I965G(dev)) {
226 if (dev_priv->panel_wants_dither || dev_priv->lvds_dither)
227 pfit_control |= PANEL_8TO6_DITHER_ENABLE;
230 /* Native modes don't need fitting */
231 if (adjusted_mode->hdisplay == mode->hdisplay &&
232 adjusted_mode->vdisplay == mode->vdisplay)
235 /* 965+ wants fuzzy fitting */
237 pfit_control |= ((intel_crtc->pipe << PFIT_PIPE_SHIFT) |
241 * Enable automatic panel scaling for non-native modes so that they fill
242 * the screen. Should be enabled before the pipe is enabled, according
243 * to register description and PRM.
244 * Change the value here to see the borders for debugging
246 I915_WRITE(BCLRPAT_A, 0);
247 I915_WRITE(BCLRPAT_B, 0);
249 switch (intel_lvds->fitting_mode) {
250 case DRM_MODE_SCALE_CENTER:
252 * For centered modes, we have to calculate border widths &
253 * heights and modify the values programmed into the CRTC.
255 centre_horizontally(adjusted_mode, mode->hdisplay);
256 centre_vertically(adjusted_mode, mode->vdisplay);
257 border = LVDS_BORDER_ENABLE;
260 case DRM_MODE_SCALE_ASPECT:
261 /* Scale but preserve the aspect ratio */
263 u32 scaled_width = adjusted_mode->hdisplay * mode->vdisplay;
264 u32 scaled_height = mode->hdisplay * adjusted_mode->vdisplay;
266 pfit_control |= PFIT_ENABLE;
267 /* 965+ is easy, it does everything in hw */
268 if (scaled_width > scaled_height)
269 pfit_control |= PFIT_SCALING_PILLAR;
270 else if (scaled_width < scaled_height)
271 pfit_control |= PFIT_SCALING_LETTER;
273 pfit_control |= PFIT_SCALING_AUTO;
275 u32 scaled_width = adjusted_mode->hdisplay * mode->vdisplay;
276 u32 scaled_height = mode->hdisplay * adjusted_mode->vdisplay;
278 * For earlier chips we have to calculate the scaling
279 * ratio by hand and program it into the
280 * PFIT_PGM_RATIO register
282 if (scaled_width > scaled_height) { /* pillar */
283 centre_horizontally(adjusted_mode, scaled_height / mode->vdisplay);
285 border = LVDS_BORDER_ENABLE;
286 if (mode->vdisplay != adjusted_mode->vdisplay) {
287 u32 bits = panel_fitter_scaling(mode->vdisplay, adjusted_mode->vdisplay);
288 pfit_pgm_ratios |= (bits << PFIT_HORIZ_SCALE_SHIFT |
289 bits << PFIT_VERT_SCALE_SHIFT);
290 pfit_control |= (PFIT_ENABLE |
291 VERT_INTERP_BILINEAR |
292 HORIZ_INTERP_BILINEAR);
294 } else if (scaled_width < scaled_height) { /* letter */
295 centre_vertically(adjusted_mode, scaled_width / mode->hdisplay);
297 border = LVDS_BORDER_ENABLE;
298 if (mode->hdisplay != adjusted_mode->hdisplay) {
299 u32 bits = panel_fitter_scaling(mode->hdisplay, adjusted_mode->hdisplay);
300 pfit_pgm_ratios |= (bits << PFIT_HORIZ_SCALE_SHIFT |
301 bits << PFIT_VERT_SCALE_SHIFT);
302 pfit_control |= (PFIT_ENABLE |
303 VERT_INTERP_BILINEAR |
304 HORIZ_INTERP_BILINEAR);
307 /* Aspects match, Let hw scale both directions */
308 pfit_control |= (PFIT_ENABLE |
309 VERT_AUTO_SCALE | HORIZ_AUTO_SCALE |
310 VERT_INTERP_BILINEAR |
311 HORIZ_INTERP_BILINEAR);
315 case DRM_MODE_SCALE_FULLSCREEN:
317 * Full scaling, even if it changes the aspect ratio.
318 * Fortunately this is all done for us in hw.
320 pfit_control |= PFIT_ENABLE;
322 pfit_control |= PFIT_SCALING_AUTO;
324 pfit_control |= (VERT_AUTO_SCALE | HORIZ_AUTO_SCALE |
325 VERT_INTERP_BILINEAR |
326 HORIZ_INTERP_BILINEAR);
334 if (pfit_control != intel_lvds->pfit_control ||
335 pfit_pgm_ratios != intel_lvds->pfit_pgm_ratios) {
336 intel_lvds->pfit_control = pfit_control;
337 intel_lvds->pfit_pgm_ratios = pfit_pgm_ratios;
338 intel_lvds->pfit_dirty = true;
340 dev_priv->lvds_border_bits = border;
343 * XXX: It would be nice to support lower refresh rates on the
344 * panels to reduce power consumption, and perhaps match the
345 * user's requested refresh rate.
351 static void intel_lvds_prepare(struct drm_encoder *encoder)
353 struct drm_device *dev = encoder->dev;
354 struct drm_i915_private *dev_priv = dev->dev_private;
355 struct intel_lvds *intel_lvds = enc_to_intel_lvds(encoder);
357 dev_priv->backlight_level = intel_panel_get_backlight(dev);
359 /* We try to do the minimum that is necessary in order to unlock
360 * the registers for mode setting.
362 * On Ironlake, this is quite simple as we just set the unlock key
363 * and ignore all subtleties. (This may cause some issues...)
365 * Prior to Ironlake, we must disable the pipe if we want to adjust
366 * the panel fitter. However at all other times we can just reset
367 * the registers regardless.
370 if (HAS_PCH_SPLIT(dev)) {
371 I915_WRITE(PCH_PP_CONTROL,
372 I915_READ(PCH_PP_CONTROL) | PANEL_UNLOCK_REGS);
373 } else if (intel_lvds->pfit_dirty) {
374 I915_WRITE(PP_CONTROL,
375 I915_READ(PP_CONTROL) & ~POWER_TARGET_ON);
376 I915_WRITE(LVDS, I915_READ(LVDS) & ~LVDS_PORT_EN);
378 I915_WRITE(PP_CONTROL,
379 I915_READ(PP_CONTROL) | PANEL_UNLOCK_REGS);
383 static void intel_lvds_commit(struct drm_encoder *encoder)
385 struct drm_device *dev = encoder->dev;
386 struct drm_i915_private *dev_priv = dev->dev_private;
387 struct intel_lvds *intel_lvds = enc_to_intel_lvds(encoder);
389 if (dev_priv->backlight_level == 0)
390 dev_priv->backlight_level = intel_panel_get_max_backlight(dev);
392 /* Undo any unlocking done in prepare to prevent accidental
393 * adjustment of the registers.
395 if (HAS_PCH_SPLIT(dev)) {
396 u32 val = I915_READ(PCH_PP_CONTROL);
397 if ((val & PANEL_UNLOCK_REGS) == PANEL_UNLOCK_REGS)
398 I915_WRITE(PCH_PP_CONTROL, val & 0x3);
400 u32 val = I915_READ(PP_CONTROL);
401 if ((val & PANEL_UNLOCK_REGS) == PANEL_UNLOCK_REGS)
402 I915_WRITE(PP_CONTROL, val & 0x3);
405 /* Always do a full power on as we do not know what state
408 intel_lvds_set_power(intel_lvds, true);
411 static void intel_lvds_mode_set(struct drm_encoder *encoder,
412 struct drm_display_mode *mode,
413 struct drm_display_mode *adjusted_mode)
415 struct drm_device *dev = encoder->dev;
416 struct drm_i915_private *dev_priv = dev->dev_private;
417 struct intel_lvds *intel_lvds = enc_to_intel_lvds(encoder);
420 * The LVDS pin pair will already have been turned on in the
421 * intel_crtc_mode_set since it has a large impact on the DPLL
425 if (HAS_PCH_SPLIT(dev))
428 if (!intel_lvds->pfit_dirty)
432 * Enable automatic panel scaling so that non-native modes fill the
433 * screen. Should be enabled before the pipe is enabled, according to
434 * register description and PRM.
436 if (wait_for((I915_READ(PP_STATUS) & PP_ON) == 0, 1000))
437 DRM_ERROR("timed out waiting for panel to power off\n");
439 I915_WRITE(PFIT_PGM_RATIOS, intel_lvds->pfit_pgm_ratios);
440 I915_WRITE(PFIT_CONTROL, intel_lvds->pfit_control);
441 intel_lvds->pfit_dirty = false;
445 * Detect the LVDS connection.
447 * Since LVDS doesn't have hotlug, we use the lid as a proxy. Open means
448 * connected and closed means disconnected. We also send hotplug events as
449 * needed, using lid status notification from the input layer.
451 static enum drm_connector_status intel_lvds_detect(struct drm_connector *connector)
453 struct drm_device *dev = connector->dev;
454 enum drm_connector_status status = connector_status_connected;
456 /* ACPI lid methods were generally unreliable in this generation, so
459 if (IS_GEN2(dev) || IS_GEN3(dev))
460 return connector_status_connected;
466 * Return the list of DDC modes if available, or the BIOS fixed mode otherwise.
468 static int intel_lvds_get_modes(struct drm_connector *connector)
470 struct drm_device *dev = connector->dev;
471 struct drm_i915_private *dev_priv = dev->dev_private;
473 if (dev_priv->lvds_edid_good) {
474 struct intel_encoder *encoder = intel_attached_encoder(connector);
475 int ret = intel_ddc_get_modes(connector, encoder->ddc_bus);
480 /* Didn't get an EDID, so
481 * Set wide sync ranges so we get all modes
482 * handed to valid_mode for checking
484 connector->display_info.min_vfreq = 0;
485 connector->display_info.max_vfreq = 200;
486 connector->display_info.min_hfreq = 0;
487 connector->display_info.max_hfreq = 200;
489 if (dev_priv->panel_fixed_mode != NULL) {
490 struct drm_display_mode *mode;
492 mode = drm_mode_duplicate(dev, dev_priv->panel_fixed_mode);
493 drm_mode_probed_add(connector, mode);
501 static int intel_no_modeset_on_lid_dmi_callback(const struct dmi_system_id *id)
503 DRM_DEBUG_KMS("Skipping forced modeset for %s\n", id->ident);
507 /* The GPU hangs up on these systems if modeset is performed on LID open */
508 static const struct dmi_system_id intel_no_modeset_on_lid[] = {
510 .callback = intel_no_modeset_on_lid_dmi_callback,
511 .ident = "Toshiba Tecra A11",
513 DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"),
514 DMI_MATCH(DMI_PRODUCT_NAME, "TECRA A11"),
518 { } /* terminating entry */
522 * Lid events. Note the use of 'modeset_on_lid':
523 * - we set it on lid close, and reset it on open
524 * - we use it as a "only once" bit (ie we ignore
525 * duplicate events where it was already properly
527 * - the suspend/resume paths will also set it to
528 * zero, since they restore the mode ("lid open").
530 static int intel_lid_notify(struct notifier_block *nb, unsigned long val,
533 struct drm_i915_private *dev_priv =
534 container_of(nb, struct drm_i915_private, lid_notifier);
535 struct drm_device *dev = dev_priv->dev;
536 struct drm_connector *connector = dev_priv->int_lvds_connector;
539 * check and update the status of LVDS connector after receiving
540 * the LID nofication event.
543 connector->status = connector->funcs->detect(connector);
544 /* Don't force modeset on machines where it causes a GPU lockup */
545 if (dmi_check_system(intel_no_modeset_on_lid))
547 if (!acpi_lid_open()) {
548 dev_priv->modeset_on_lid = 1;
552 if (!dev_priv->modeset_on_lid)
555 dev_priv->modeset_on_lid = 0;
557 mutex_lock(&dev->mode_config.mutex);
558 drm_helper_resume_force_mode(dev);
559 mutex_unlock(&dev->mode_config.mutex);
565 * intel_lvds_destroy - unregister and free LVDS structures
566 * @connector: connector to free
568 * Unregister the DDC bus for this connector then free the driver private
571 static void intel_lvds_destroy(struct drm_connector *connector)
573 struct drm_device *dev = connector->dev;
574 struct drm_i915_private *dev_priv = dev->dev_private;
576 if (dev_priv->lid_notifier.notifier_call)
577 acpi_lid_notifier_unregister(&dev_priv->lid_notifier);
578 drm_sysfs_connector_remove(connector);
579 drm_connector_cleanup(connector);
583 static int intel_lvds_set_property(struct drm_connector *connector,
584 struct drm_property *property,
587 struct drm_device *dev = connector->dev;
589 if (property == dev->mode_config.scaling_mode_property &&
590 connector->encoder) {
591 struct drm_crtc *crtc = connector->encoder->crtc;
592 struct drm_encoder *encoder = connector->encoder;
593 struct intel_lvds *intel_lvds = enc_to_intel_lvds(encoder);
595 if (value == DRM_MODE_SCALE_NONE) {
596 DRM_DEBUG_KMS("no scaling not supported\n");
599 if (intel_lvds->fitting_mode == value) {
600 /* the LVDS scaling property is not changed */
603 intel_lvds->fitting_mode = value;
604 if (crtc && crtc->enabled) {
606 * If the CRTC is enabled, the display will be changed
607 * according to the new panel fitting mode.
609 drm_crtc_helper_set_mode(crtc, &crtc->mode,
610 crtc->x, crtc->y, crtc->fb);
617 static const struct drm_encoder_helper_funcs intel_lvds_helper_funcs = {
618 .dpms = intel_lvds_dpms,
619 .mode_fixup = intel_lvds_mode_fixup,
620 .prepare = intel_lvds_prepare,
621 .mode_set = intel_lvds_mode_set,
622 .commit = intel_lvds_commit,
625 static const struct drm_connector_helper_funcs intel_lvds_connector_helper_funcs = {
626 .get_modes = intel_lvds_get_modes,
627 .mode_valid = intel_lvds_mode_valid,
628 .best_encoder = intel_best_encoder,
631 static const struct drm_connector_funcs intel_lvds_connector_funcs = {
632 .dpms = drm_helper_connector_dpms,
633 .detect = intel_lvds_detect,
634 .fill_modes = drm_helper_probe_single_connector_modes,
635 .set_property = intel_lvds_set_property,
636 .destroy = intel_lvds_destroy,
639 static const struct drm_encoder_funcs intel_lvds_enc_funcs = {
640 .destroy = intel_encoder_destroy,
643 static int __init intel_no_lvds_dmi_callback(const struct dmi_system_id *id)
645 DRM_DEBUG_KMS("Skipping LVDS initialization for %s\n", id->ident);
649 /* These systems claim to have LVDS, but really don't */
650 static const struct dmi_system_id intel_no_lvds[] = {
652 .callback = intel_no_lvds_dmi_callback,
653 .ident = "Apple Mac Mini (Core series)",
655 DMI_MATCH(DMI_SYS_VENDOR, "Apple"),
656 DMI_MATCH(DMI_PRODUCT_NAME, "Macmini1,1"),
660 .callback = intel_no_lvds_dmi_callback,
661 .ident = "Apple Mac Mini (Core 2 series)",
663 DMI_MATCH(DMI_SYS_VENDOR, "Apple"),
664 DMI_MATCH(DMI_PRODUCT_NAME, "Macmini2,1"),
668 .callback = intel_no_lvds_dmi_callback,
669 .ident = "MSI IM-945GSE-A",
671 DMI_MATCH(DMI_SYS_VENDOR, "MSI"),
672 DMI_MATCH(DMI_PRODUCT_NAME, "A9830IMS"),
676 .callback = intel_no_lvds_dmi_callback,
677 .ident = "Dell Studio Hybrid",
679 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
680 DMI_MATCH(DMI_PRODUCT_NAME, "Studio Hybrid 140g"),
684 .callback = intel_no_lvds_dmi_callback,
685 .ident = "AOpen Mini PC",
687 DMI_MATCH(DMI_SYS_VENDOR, "AOpen"),
688 DMI_MATCH(DMI_PRODUCT_NAME, "i965GMx-IF"),
692 .callback = intel_no_lvds_dmi_callback,
693 .ident = "AOpen Mini PC MP915",
695 DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"),
696 DMI_MATCH(DMI_BOARD_NAME, "i915GMx-F"),
700 .callback = intel_no_lvds_dmi_callback,
701 .ident = "Aopen i945GTt-VFA",
703 DMI_MATCH(DMI_PRODUCT_VERSION, "AO00001JW"),
707 .callback = intel_no_lvds_dmi_callback,
708 .ident = "Clientron U800",
710 DMI_MATCH(DMI_SYS_VENDOR, "Clientron"),
711 DMI_MATCH(DMI_PRODUCT_NAME, "U800"),
715 { } /* terminating entry */
719 * intel_find_lvds_downclock - find the reduced downclock for LVDS in EDID
721 * @connector: LVDS connector
723 * Find the reduced downclock for LVDS in EDID.
725 static void intel_find_lvds_downclock(struct drm_device *dev,
726 struct drm_connector *connector)
728 struct drm_i915_private *dev_priv = dev->dev_private;
729 struct drm_display_mode *scan, *panel_fixed_mode;
732 panel_fixed_mode = dev_priv->panel_fixed_mode;
733 temp_downclock = panel_fixed_mode->clock;
735 mutex_lock(&dev->mode_config.mutex);
736 list_for_each_entry(scan, &connector->probed_modes, head) {
738 * If one mode has the same resolution with the fixed_panel
739 * mode while they have the different refresh rate, it means
740 * that the reduced downclock is found for the LVDS. In such
741 * case we can set the different FPx0/1 to dynamically select
742 * between low and high frequency.
744 if (scan->hdisplay == panel_fixed_mode->hdisplay &&
745 scan->hsync_start == panel_fixed_mode->hsync_start &&
746 scan->hsync_end == panel_fixed_mode->hsync_end &&
747 scan->htotal == panel_fixed_mode->htotal &&
748 scan->vdisplay == panel_fixed_mode->vdisplay &&
749 scan->vsync_start == panel_fixed_mode->vsync_start &&
750 scan->vsync_end == panel_fixed_mode->vsync_end &&
751 scan->vtotal == panel_fixed_mode->vtotal) {
752 if (scan->clock < temp_downclock) {
754 * The downclock is already found. But we
755 * expect to find the lower downclock.
757 temp_downclock = scan->clock;
761 mutex_unlock(&dev->mode_config.mutex);
762 if (temp_downclock < panel_fixed_mode->clock &&
763 i915_lvds_downclock) {
764 /* We found the downclock for LVDS. */
765 dev_priv->lvds_downclock_avail = 1;
766 dev_priv->lvds_downclock = temp_downclock;
767 DRM_DEBUG_KMS("LVDS downclock is found in EDID. "
768 "Normal clock %dKhz, downclock %dKhz\n",
769 panel_fixed_mode->clock, temp_downclock);
775 * Enumerate the child dev array parsed from VBT to check whether
776 * the LVDS is present.
777 * If it is present, return 1.
778 * If it is not present, return false.
779 * If no child dev is parsed from VBT, it assumes that the LVDS is present.
781 static bool lvds_is_present_in_vbt(struct drm_device *dev)
783 struct drm_i915_private *dev_priv = dev->dev_private;
786 if (!dev_priv->child_dev_num)
789 for (i = 0; i < dev_priv->child_dev_num; i++) {
790 struct child_device_config *child = dev_priv->child_dev + i;
792 /* If the device type is not LFP, continue.
793 * We have to check both the new identifiers as well as the
794 * old for compatibility with some BIOSes.
796 if (child->device_type != DEVICE_TYPE_INT_LFP &&
797 child->device_type != DEVICE_TYPE_LFP)
800 /* However, we cannot trust the BIOS writers to populate
801 * the VBT correctly. Since LVDS requires additional
802 * information from AIM blocks, a non-zero addin offset is
803 * a good indicator that the LVDS is actually present.
805 if (child->addin_offset)
808 /* But even then some BIOS writers perform some black magic
809 * and instantiate the device without reference to any
810 * additional data. Trust that if the VBT was written into
811 * the OpRegion then they have validated the LVDS's existence.
813 if (dev_priv->opregion.vbt)
821 * intel_lvds_init - setup LVDS connectors on this device
824 * Create the connector, register the LVDS DDC bus, and try to figure out what
825 * modes we can display on the LVDS panel (if present).
827 void intel_lvds_init(struct drm_device *dev)
829 struct drm_i915_private *dev_priv = dev->dev_private;
830 struct intel_lvds *intel_lvds;
831 struct intel_encoder *intel_encoder;
832 struct intel_connector *intel_connector;
833 struct drm_connector *connector;
834 struct drm_encoder *encoder;
835 struct drm_display_mode *scan; /* *modes, *bios_mode; */
836 struct drm_crtc *crtc;
838 int pipe, gpio = GPIOC;
840 /* Skip init on machines we know falsely report LVDS */
841 if (dmi_check_system(intel_no_lvds))
844 if (!lvds_is_present_in_vbt(dev)) {
845 DRM_DEBUG_KMS("LVDS is not present in VBT\n");
849 if (HAS_PCH_SPLIT(dev)) {
850 if ((I915_READ(PCH_LVDS) & LVDS_DETECTED) == 0)
852 if (dev_priv->edp_support) {
853 DRM_DEBUG_KMS("disable LVDS for eDP support\n");
859 intel_lvds = kzalloc(sizeof(struct intel_lvds), GFP_KERNEL);
864 intel_connector = kzalloc(sizeof(struct intel_connector), GFP_KERNEL);
865 if (!intel_connector) {
870 if (!HAS_PCH_SPLIT(dev)) {
871 intel_lvds->pfit_control = I915_READ(PFIT_CONTROL);
874 intel_encoder = &intel_lvds->base;
875 encoder = &intel_encoder->base;
876 connector = &intel_connector->base;
877 drm_connector_init(dev, &intel_connector->base, &intel_lvds_connector_funcs,
878 DRM_MODE_CONNECTOR_LVDS);
880 drm_encoder_init(dev, &intel_encoder->base, &intel_lvds_enc_funcs,
881 DRM_MODE_ENCODER_LVDS);
883 intel_connector_attach_encoder(intel_connector, intel_encoder);
884 intel_encoder->type = INTEL_OUTPUT_LVDS;
886 intel_encoder->clone_mask = (1 << INTEL_LVDS_CLONE_BIT);
887 intel_encoder->crtc_mask = (1 << 1);
888 drm_encoder_helper_add(encoder, &intel_lvds_helper_funcs);
889 drm_connector_helper_add(connector, &intel_lvds_connector_helper_funcs);
890 connector->display_info.subpixel_order = SubPixelHorizontalRGB;
891 connector->interlace_allowed = false;
892 connector->doublescan_allowed = false;
894 /* create the scaling mode property */
895 drm_mode_create_scaling_mode_property(dev);
897 * the initial panel fitting mode will be FULL_SCREEN.
900 drm_connector_attach_property(&intel_connector->base,
901 dev->mode_config.scaling_mode_property,
902 DRM_MODE_SCALE_ASPECT);
903 intel_lvds->fitting_mode = DRM_MODE_SCALE_ASPECT;
906 * 1) check for EDID on DDC
907 * 2) check for VBT data
908 * 3) check to see if LVDS is already on
909 * if none of the above, no panel
910 * 4) make sure lid is open
911 * if closed, act like it's not there for now
914 /* Set up the DDC bus. */
915 intel_encoder->ddc_bus = intel_i2c_create(dev, gpio, "LVDSDDC_C");
916 if (!intel_encoder->ddc_bus) {
917 dev_printk(KERN_ERR, &dev->pdev->dev, "DDC bus registration "
923 * Attempt to get the fixed panel mode from DDC. Assume that the
924 * preferred mode is the right one.
926 dev_priv->lvds_edid_good = true;
928 if (!intel_ddc_get_modes(connector, intel_encoder->ddc_bus))
929 dev_priv->lvds_edid_good = false;
931 list_for_each_entry(scan, &connector->probed_modes, head) {
932 mutex_lock(&dev->mode_config.mutex);
933 if (scan->type & DRM_MODE_TYPE_PREFERRED) {
934 dev_priv->panel_fixed_mode =
935 drm_mode_duplicate(dev, scan);
936 mutex_unlock(&dev->mode_config.mutex);
937 intel_find_lvds_downclock(dev, connector);
940 mutex_unlock(&dev->mode_config.mutex);
943 /* Failed to get EDID, what about VBT? */
944 if (dev_priv->lfp_lvds_vbt_mode) {
945 mutex_lock(&dev->mode_config.mutex);
946 dev_priv->panel_fixed_mode =
947 drm_mode_duplicate(dev, dev_priv->lfp_lvds_vbt_mode);
948 mutex_unlock(&dev->mode_config.mutex);
949 if (dev_priv->panel_fixed_mode) {
950 dev_priv->panel_fixed_mode->type |=
951 DRM_MODE_TYPE_PREFERRED;
957 * If we didn't get EDID, try checking if the panel is already turned
958 * on. If so, assume that whatever is currently programmed is the
962 /* Ironlake: FIXME if still fail, not try pipe mode now */
963 if (HAS_PCH_SPLIT(dev))
966 lvds = I915_READ(LVDS);
967 pipe = (lvds & LVDS_PIPEB_SELECT) ? 1 : 0;
968 crtc = intel_get_crtc_for_pipe(dev, pipe);
970 if (crtc && (lvds & LVDS_PORT_EN)) {
971 dev_priv->panel_fixed_mode = intel_crtc_mode_get(dev, crtc);
972 if (dev_priv->panel_fixed_mode) {
973 dev_priv->panel_fixed_mode->type |=
974 DRM_MODE_TYPE_PREFERRED;
979 /* If we still don't have a mode after all that, give up. */
980 if (!dev_priv->panel_fixed_mode)
984 if (HAS_PCH_SPLIT(dev)) {
986 /* make sure PWM is enabled */
987 pwm = I915_READ(BLC_PWM_CPU_CTL2);
988 pwm |= (PWM_ENABLE | PWM_PIPE_B);
989 I915_WRITE(BLC_PWM_CPU_CTL2, pwm);
991 pwm = I915_READ(BLC_PWM_PCH_CTL1);
992 pwm |= PWM_PCH_ENABLE;
993 I915_WRITE(BLC_PWM_PCH_CTL1, pwm);
995 dev_priv->lid_notifier.notifier_call = intel_lid_notify;
996 if (acpi_lid_notifier_register(&dev_priv->lid_notifier)) {
997 DRM_DEBUG_KMS("lid notifier registration failed\n");
998 dev_priv->lid_notifier.notifier_call = NULL;
1000 /* keep the LVDS connector */
1001 dev_priv->int_lvds_connector = connector;
1002 drm_sysfs_connector_add(connector);
1006 DRM_DEBUG_KMS("No LVDS modes found, disabling.\n");
1007 if (intel_encoder->ddc_bus)
1008 intel_i2c_destroy(intel_encoder->ddc_bus);
1009 drm_connector_cleanup(connector);
1010 drm_encoder_cleanup(encoder);
1012 kfree(intel_connector);