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 <linux/i2c.h>
35 #include "intel_drv.h"
40 * Sets the backlight level.
42 * \param level backlight level, from 0 to intel_lvds_get_max_backlight().
44 static void intel_lvds_set_backlight(struct drm_device *dev, int level)
46 struct drm_i915_private *dev_priv = dev->dev_private;
49 blc_pwm_ctl = I915_READ(BLC_PWM_CTL) & ~BACKLIGHT_DUTY_CYCLE_MASK;
50 I915_WRITE(BLC_PWM_CTL, (blc_pwm_ctl |
51 (level << BACKLIGHT_DUTY_CYCLE_SHIFT)));
55 * Returns the maximum level of the backlight duty cycle field.
57 static u32 intel_lvds_get_max_backlight(struct drm_device *dev)
59 struct drm_i915_private *dev_priv = dev->dev_private;
61 return ((I915_READ(BLC_PWM_CTL) & BACKLIGHT_MODULATION_FREQ_MASK) >>
62 BACKLIGHT_MODULATION_FREQ_SHIFT) * 2;
66 * Sets the power state for the panel.
68 static void intel_lvds_set_power(struct drm_device *dev, bool on)
70 struct drm_i915_private *dev_priv = dev->dev_private;
74 I915_WRITE(PP_CONTROL, I915_READ(PP_CONTROL) |
77 pp_status = I915_READ(PP_STATUS);
78 } while ((pp_status & PP_ON) == 0);
80 intel_lvds_set_backlight(dev, dev_priv->backlight_duty_cycle);
82 intel_lvds_set_backlight(dev, 0);
84 I915_WRITE(PP_CONTROL, I915_READ(PP_CONTROL) &
87 pp_status = I915_READ(PP_STATUS);
88 } while (pp_status & PP_ON);
92 static void intel_lvds_dpms(struct drm_encoder *encoder, int mode)
94 struct drm_device *dev = encoder->dev;
96 if (mode == DRM_MODE_DPMS_ON)
97 intel_lvds_set_power(dev, true);
99 intel_lvds_set_power(dev, false);
101 /* XXX: We never power down the LVDS pairs. */
104 static void intel_lvds_save(struct drm_connector *connector)
106 struct drm_device *dev = connector->dev;
107 struct drm_i915_private *dev_priv = dev->dev_private;
109 dev_priv->savePP_ON = I915_READ(PP_ON_DELAYS);
110 dev_priv->savePP_OFF = I915_READ(PP_OFF_DELAYS);
111 dev_priv->savePP_CONTROL = I915_READ(PP_CONTROL);
112 dev_priv->savePP_DIVISOR = I915_READ(PP_DIVISOR);
113 dev_priv->saveBLC_PWM_CTL = I915_READ(BLC_PWM_CTL);
114 dev_priv->backlight_duty_cycle = (dev_priv->saveBLC_PWM_CTL &
115 BACKLIGHT_DUTY_CYCLE_MASK);
118 * If the light is off at server startup, just make it full brightness
120 if (dev_priv->backlight_duty_cycle == 0)
121 dev_priv->backlight_duty_cycle =
122 intel_lvds_get_max_backlight(dev);
125 static void intel_lvds_restore(struct drm_connector *connector)
127 struct drm_device *dev = connector->dev;
128 struct drm_i915_private *dev_priv = dev->dev_private;
130 I915_WRITE(BLC_PWM_CTL, dev_priv->saveBLC_PWM_CTL);
131 I915_WRITE(PP_ON_DELAYS, dev_priv->savePP_ON);
132 I915_WRITE(PP_OFF_DELAYS, dev_priv->savePP_OFF);
133 I915_WRITE(PP_DIVISOR, dev_priv->savePP_DIVISOR);
134 I915_WRITE(PP_CONTROL, dev_priv->savePP_CONTROL);
135 if (dev_priv->savePP_CONTROL & POWER_TARGET_ON)
136 intel_lvds_set_power(dev, true);
138 intel_lvds_set_power(dev, false);
141 static int intel_lvds_mode_valid(struct drm_connector *connector,
142 struct drm_display_mode *mode)
144 struct drm_device *dev = connector->dev;
145 struct drm_i915_private *dev_priv = dev->dev_private;
146 struct drm_display_mode *fixed_mode = dev_priv->panel_fixed_mode;
149 if (mode->hdisplay > fixed_mode->hdisplay)
151 if (mode->vdisplay > fixed_mode->vdisplay)
158 static bool intel_lvds_mode_fixup(struct drm_encoder *encoder,
159 struct drm_display_mode *mode,
160 struct drm_display_mode *adjusted_mode)
162 struct drm_device *dev = encoder->dev;
163 struct drm_i915_private *dev_priv = dev->dev_private;
164 struct intel_crtc *intel_crtc = to_intel_crtc(encoder->crtc);
165 struct drm_encoder *tmp_encoder;
167 /* Should never happen!! */
168 if (!IS_I965G(dev) && intel_crtc->pipe == 0) {
169 printk(KERN_ERR "Can't support LVDS on pipe A\n");
173 /* Should never happen!! */
174 list_for_each_entry(tmp_encoder, &dev->mode_config.encoder_list, head) {
175 if (tmp_encoder != encoder && tmp_encoder->crtc == encoder->crtc) {
176 printk(KERN_ERR "Can't enable LVDS and another "
177 "encoder on the same pipe\n");
183 * If we have timings from the BIOS for the panel, put them in
184 * to the adjusted mode. The CRTC will be set up for this mode,
185 * with the panel scaling set up to source from the H/VDisplay
186 * of the original mode.
188 if (dev_priv->panel_fixed_mode != NULL) {
189 adjusted_mode->hdisplay = dev_priv->panel_fixed_mode->hdisplay;
190 adjusted_mode->hsync_start =
191 dev_priv->panel_fixed_mode->hsync_start;
192 adjusted_mode->hsync_end =
193 dev_priv->panel_fixed_mode->hsync_end;
194 adjusted_mode->htotal = dev_priv->panel_fixed_mode->htotal;
195 adjusted_mode->vdisplay = dev_priv->panel_fixed_mode->vdisplay;
196 adjusted_mode->vsync_start =
197 dev_priv->panel_fixed_mode->vsync_start;
198 adjusted_mode->vsync_end =
199 dev_priv->panel_fixed_mode->vsync_end;
200 adjusted_mode->vtotal = dev_priv->panel_fixed_mode->vtotal;
201 adjusted_mode->clock = dev_priv->panel_fixed_mode->clock;
202 drm_mode_set_crtcinfo(adjusted_mode, CRTC_INTERLACE_HALVE_V);
206 * XXX: It would be nice to support lower refresh rates on the
207 * panels to reduce power consumption, and perhaps match the
208 * user's requested refresh rate.
214 static void intel_lvds_prepare(struct drm_encoder *encoder)
216 struct drm_device *dev = encoder->dev;
217 struct drm_i915_private *dev_priv = dev->dev_private;
219 dev_priv->saveBLC_PWM_CTL = I915_READ(BLC_PWM_CTL);
220 dev_priv->backlight_duty_cycle = (dev_priv->saveBLC_PWM_CTL &
221 BACKLIGHT_DUTY_CYCLE_MASK);
223 intel_lvds_set_power(dev, false);
226 static void intel_lvds_commit( struct drm_encoder *encoder)
228 struct drm_device *dev = encoder->dev;
229 struct drm_i915_private *dev_priv = dev->dev_private;
231 if (dev_priv->backlight_duty_cycle == 0)
232 dev_priv->backlight_duty_cycle =
233 intel_lvds_get_max_backlight(dev);
235 intel_lvds_set_power(dev, true);
238 static void intel_lvds_mode_set(struct drm_encoder *encoder,
239 struct drm_display_mode *mode,
240 struct drm_display_mode *adjusted_mode)
242 struct drm_device *dev = encoder->dev;
243 struct drm_i915_private *dev_priv = dev->dev_private;
244 struct intel_crtc *intel_crtc = to_intel_crtc(encoder->crtc);
248 * The LVDS pin pair will already have been turned on in the
249 * intel_crtc_mode_set since it has a large impact on the DPLL
254 * Enable automatic panel scaling so that non-native modes fill the
255 * screen. Should be enabled before the pipe is enabled, according to
256 * register description and PRM.
258 if (mode->hdisplay != adjusted_mode->hdisplay ||
259 mode->vdisplay != adjusted_mode->vdisplay)
260 pfit_control = (PFIT_ENABLE | VERT_AUTO_SCALE |
261 HORIZ_AUTO_SCALE | VERT_INTERP_BILINEAR |
262 HORIZ_INTERP_BILINEAR);
266 if (!IS_I965G(dev)) {
267 if (dev_priv->panel_wants_dither)
268 pfit_control |= PANEL_8TO6_DITHER_ENABLE;
271 pfit_control |= intel_crtc->pipe << PFIT_PIPE_SHIFT;
273 I915_WRITE(PFIT_CONTROL, pfit_control);
277 * Detect the LVDS connection.
279 * This always returns CONNECTOR_STATUS_CONNECTED. This connector should only have
280 * been set up if the LVDS was actually connected anyway.
282 static enum drm_connector_status intel_lvds_detect(struct drm_connector *connector)
284 return connector_status_connected;
288 * Return the list of DDC modes if available, or the BIOS fixed mode otherwise.
290 static int intel_lvds_get_modes(struct drm_connector *connector)
292 struct drm_device *dev = connector->dev;
293 struct intel_output *intel_output = to_intel_output(connector);
294 struct drm_i915_private *dev_priv = dev->dev_private;
297 ret = intel_ddc_get_modes(intel_output);
302 /* Didn't get an EDID, so
303 * Set wide sync ranges so we get all modes
304 * handed to valid_mode for checking
306 connector->display_info.min_vfreq = 0;
307 connector->display_info.max_vfreq = 200;
308 connector->display_info.min_hfreq = 0;
309 connector->display_info.max_hfreq = 200;
311 if (dev_priv->panel_fixed_mode != NULL) {
312 struct drm_display_mode *mode =
313 drm_mode_duplicate(dev, dev_priv->panel_fixed_mode);
314 drm_mode_probed_add(connector, mode);
322 * intel_lvds_destroy - unregister and free LVDS structures
323 * @connector: connector to free
325 * Unregister the DDC bus for this connector then free the driver private
328 static void intel_lvds_destroy(struct drm_connector *connector)
330 struct intel_output *intel_output = to_intel_output(connector);
332 if (intel_output->ddc_bus)
333 intel_i2c_destroy(intel_output->ddc_bus);
334 drm_sysfs_connector_remove(connector);
335 drm_connector_cleanup(connector);
339 static const struct drm_encoder_helper_funcs intel_lvds_helper_funcs = {
340 .dpms = intel_lvds_dpms,
341 .mode_fixup = intel_lvds_mode_fixup,
342 .prepare = intel_lvds_prepare,
343 .mode_set = intel_lvds_mode_set,
344 .commit = intel_lvds_commit,
347 static const struct drm_connector_helper_funcs intel_lvds_connector_helper_funcs = {
348 .get_modes = intel_lvds_get_modes,
349 .mode_valid = intel_lvds_mode_valid,
350 .best_encoder = intel_best_encoder,
353 static const struct drm_connector_funcs intel_lvds_connector_funcs = {
354 .save = intel_lvds_save,
355 .restore = intel_lvds_restore,
356 .detect = intel_lvds_detect,
357 .fill_modes = drm_helper_probe_single_connector_modes,
358 .destroy = intel_lvds_destroy,
362 static void intel_lvds_enc_destroy(struct drm_encoder *encoder)
364 drm_encoder_cleanup(encoder);
367 static const struct drm_encoder_funcs intel_lvds_enc_funcs = {
368 .destroy = intel_lvds_enc_destroy,
374 * intel_lvds_init - setup LVDS connectors on this device
377 * Create the connector, register the LVDS DDC bus, and try to figure out what
378 * modes we can display on the LVDS panel (if present).
380 void intel_lvds_init(struct drm_device *dev)
382 struct drm_i915_private *dev_priv = dev->dev_private;
383 struct intel_output *intel_output;
384 struct drm_connector *connector;
385 struct drm_encoder *encoder;
386 struct drm_display_mode *scan; /* *modes, *bios_mode; */
387 struct drm_crtc *crtc;
391 intel_output = kzalloc(sizeof(struct intel_output), GFP_KERNEL);
396 connector = &intel_output->base;
397 encoder = &intel_output->enc;
398 drm_connector_init(dev, &intel_output->base, &intel_lvds_connector_funcs,
399 DRM_MODE_CONNECTOR_LVDS);
401 drm_encoder_init(dev, &intel_output->enc, &intel_lvds_enc_funcs,
402 DRM_MODE_ENCODER_LVDS);
404 drm_mode_connector_attach_encoder(&intel_output->base, &intel_output->enc);
405 intel_output->type = INTEL_OUTPUT_LVDS;
407 drm_encoder_helper_add(encoder, &intel_lvds_helper_funcs);
408 drm_connector_helper_add(connector, &intel_lvds_connector_helper_funcs);
409 connector->display_info.subpixel_order = SubPixelHorizontalRGB;
410 connector->interlace_allowed = false;
411 connector->doublescan_allowed = false;
416 * 1) check for EDID on DDC
417 * 2) check for VBT data
418 * 3) check to see if LVDS is already on
419 * if none of the above, no panel
420 * 4) make sure lid is open
421 * if closed, act like it's not there for now
424 /* Set up the DDC bus. */
425 intel_output->ddc_bus = intel_i2c_create(dev, GPIOC, "LVDSDDC_C");
426 if (!intel_output->ddc_bus) {
427 dev_printk(KERN_ERR, &dev->pdev->dev, "DDC bus registration "
433 * Attempt to get the fixed panel mode from DDC. Assume that the
434 * preferred mode is the right one.
436 intel_ddc_get_modes(intel_output);
438 list_for_each_entry(scan, &connector->probed_modes, head) {
439 if (scan->type & DRM_MODE_TYPE_PREFERRED) {
440 dev_priv->panel_fixed_mode =
441 drm_mode_duplicate(dev, scan);
442 goto out; /* FIXME: check for quirks */
446 /* Failed to get EDID, what about VBT? */
447 if (dev_priv->vbt_mode)
448 dev_priv->panel_fixed_mode =
449 drm_mode_duplicate(dev, dev_priv->vbt_mode);
452 * If we didn't get EDID, try checking if the panel is already turned
453 * on. If so, assume that whatever is currently programmed is the
456 lvds = I915_READ(LVDS);
457 pipe = (lvds & LVDS_PIPEB_SELECT) ? 1 : 0;
458 crtc = intel_get_crtc_from_pipe(dev, pipe);
460 if (crtc && (lvds & LVDS_PORT_EN)) {
461 dev_priv->panel_fixed_mode = intel_crtc_mode_get(dev, crtc);
462 if (dev_priv->panel_fixed_mode) {
463 dev_priv->panel_fixed_mode->type |=
464 DRM_MODE_TYPE_PREFERRED;
465 goto out; /* FIXME: check for quirks */
469 /* If we still don't have a mode after all that, give up. */
470 if (!dev_priv->panel_fixed_mode)
473 /* FIXME: detect aopen & mac mini type stuff automatically? */
475 * Blacklist machines with BIOSes that list an LVDS panel without
476 * actually having one.
478 if (IS_I945GM(dev)) {
480 if (dev->pdev->subsystem_vendor == 0xa0a0)
483 if ((dev->pdev->subsystem_vendor == 0x8086) &&
484 (dev->pdev->subsystem_device == 0x7270)) {
485 /* It's a Mac Mini or Macbook Pro.
487 * Apple hardware is out to get us. The macbook pro
488 * has a real LVDS panel, but the mac mini does not,
489 * and they have the same device IDs. We'll
490 * distinguish by panel size, on the assumption
491 * that Apple isn't about to make any machines with an
495 if (dev_priv->panel_fixed_mode != NULL &&
496 dev_priv->panel_fixed_mode->hdisplay == 800 &&
497 dev_priv->panel_fixed_mode->vdisplay == 600) {
498 DRM_DEBUG("Suspected Mac Mini, ignoring the LVDS\n");
506 drm_sysfs_connector_add(connector);
510 DRM_DEBUG("No LVDS modes found, disabling.\n");
511 if (intel_output->ddc_bus)
512 intel_i2c_destroy(intel_output->ddc_bus);
513 drm_connector_cleanup(connector);