1 // SPDX-License-Identifier: GPL-2.0-only
3 * Copyright © 2006-2007 Intel Corporation
11 #include <linux/i2c.h>
12 #include <linux/pm_runtime.h>
14 #include <drm/drm_simple_kms_helper.h>
16 #include "intel_bios.h"
19 #include "psb_intel_drv.h"
20 #include "psb_intel_reg.h"
23 * LVDS I2C backlight control macros
25 #define BRIGHTNESS_MAX_LEVEL 100
26 #define BRIGHTNESS_MASK 0xFF
27 #define BLC_I2C_TYPE 0x01
28 #define BLC_PWM_TYPT 0x02
30 #define BLC_POLARITY_NORMAL 0
31 #define BLC_POLARITY_INVERSE 1
33 #define PSB_BLC_MAX_PWM_REG_FREQ (0xFFFE)
34 #define PSB_BLC_MIN_PWM_REG_FREQ (0x2)
35 #define PSB_BLC_PWM_PRECISION_FACTOR (10)
36 #define PSB_BACKLIGHT_PWM_CTL_SHIFT (16)
37 #define PSB_BACKLIGHT_PWM_POLARITY_BIT_CLEAR (0xFFFE)
39 struct psb_intel_lvds_priv {
41 * Saved LVDO output states
46 uint32_t savePP_CONTROL;
47 uint32_t savePP_CYCLE;
48 uint32_t savePFIT_CONTROL;
49 uint32_t savePFIT_PGM_RATIOS;
50 uint32_t saveBLC_PWM_CTL;
52 struct gma_i2c_chan *i2c_bus;
57 * Returns the maximum level of the backlight duty cycle field.
59 static u32 psb_intel_lvds_get_max_backlight(struct drm_device *dev)
61 struct drm_psb_private *dev_priv = to_drm_psb_private(dev);
64 if (gma_power_begin(dev, false)) {
65 ret = REG_READ(BLC_PWM_CTL);
67 } else /* Powered off, use the saved value */
68 ret = dev_priv->regs.saveBLC_PWM_CTL;
70 /* Top 15bits hold the frequency mask */
71 ret = (ret & BACKLIGHT_MODULATION_FREQ_MASK) >>
72 BACKLIGHT_MODULATION_FREQ_SHIFT;
74 ret *= 2; /* Return a 16bit range as needed for setting */
76 dev_err(dev->dev, "BL bug: Reg %08x save %08X\n",
77 REG_READ(BLC_PWM_CTL), dev_priv->regs.saveBLC_PWM_CTL);
82 * Set LVDS backlight level by I2C command
84 * FIXME: at some point we need to both track this for PM and also
85 * disable runtime pm on MRST if the brightness is nil (ie blanked)
87 static int psb_lvds_i2c_set_brightness(struct drm_device *dev,
90 struct drm_psb_private *dev_priv = to_drm_psb_private(dev);
92 struct gma_i2c_chan *lvds_i2c_bus = dev_priv->lvds_i2c_bus;
94 unsigned int blc_i2c_brightness;
96 struct i2c_msg msgs[] = {
98 .addr = lvds_i2c_bus->slave_addr,
105 blc_i2c_brightness = BRIGHTNESS_MASK & ((unsigned int)level *
107 BRIGHTNESS_MAX_LEVEL);
109 if (dev_priv->lvds_bl->pol == BLC_POLARITY_INVERSE)
110 blc_i2c_brightness = BRIGHTNESS_MASK - blc_i2c_brightness;
112 out_buf[0] = dev_priv->lvds_bl->brightnesscmd;
113 out_buf[1] = (u8)blc_i2c_brightness;
115 if (i2c_transfer(&lvds_i2c_bus->base, msgs, 1) == 1) {
116 dev_dbg(dev->dev, "I2C set brightness.(command, value) (%d, %d)\n",
117 dev_priv->lvds_bl->brightnesscmd,
122 dev_err(dev->dev, "I2C transfer error\n");
127 static int psb_lvds_pwm_set_brightness(struct drm_device *dev, int level)
129 struct drm_psb_private *dev_priv = to_drm_psb_private(dev);
132 u32 blc_pwm_duty_cycle;
134 max_pwm_blc = psb_intel_lvds_get_max_backlight(dev);
136 /*BLC_PWM_CTL Should be initiated while backlight device init*/
137 BUG_ON(max_pwm_blc == 0);
139 blc_pwm_duty_cycle = level * max_pwm_blc / BRIGHTNESS_MAX_LEVEL;
141 if (dev_priv->lvds_bl->pol == BLC_POLARITY_INVERSE)
142 blc_pwm_duty_cycle = max_pwm_blc - blc_pwm_duty_cycle;
144 blc_pwm_duty_cycle &= PSB_BACKLIGHT_PWM_POLARITY_BIT_CLEAR;
145 REG_WRITE(BLC_PWM_CTL,
146 (max_pwm_blc << PSB_BACKLIGHT_PWM_CTL_SHIFT) |
147 (blc_pwm_duty_cycle));
149 dev_info(dev->dev, "Backlight lvds set brightness %08x\n",
150 (max_pwm_blc << PSB_BACKLIGHT_PWM_CTL_SHIFT) |
151 (blc_pwm_duty_cycle));
157 * Set LVDS backlight level either by I2C or PWM
159 void psb_intel_lvds_set_brightness(struct drm_device *dev, int level)
161 struct drm_psb_private *dev_priv = to_drm_psb_private(dev);
163 dev_dbg(dev->dev, "backlight level is %d\n", level);
165 if (!dev_priv->lvds_bl) {
166 dev_err(dev->dev, "NO LVDS backlight info\n");
170 if (dev_priv->lvds_bl->type == BLC_I2C_TYPE)
171 psb_lvds_i2c_set_brightness(dev, level);
173 psb_lvds_pwm_set_brightness(dev, level);
177 * Sets the backlight level.
179 * level: backlight level, from 0 to psb_intel_lvds_get_max_backlight().
181 static void psb_intel_lvds_set_backlight(struct drm_device *dev, int level)
183 struct drm_psb_private *dev_priv = to_drm_psb_private(dev);
186 if (gma_power_begin(dev, false)) {
187 blc_pwm_ctl = REG_READ(BLC_PWM_CTL);
188 blc_pwm_ctl &= ~BACKLIGHT_DUTY_CYCLE_MASK;
189 REG_WRITE(BLC_PWM_CTL,
191 (level << BACKLIGHT_DUTY_CYCLE_SHIFT)));
192 dev_priv->regs.saveBLC_PWM_CTL = (blc_pwm_ctl |
193 (level << BACKLIGHT_DUTY_CYCLE_SHIFT));
196 blc_pwm_ctl = dev_priv->regs.saveBLC_PWM_CTL &
197 ~BACKLIGHT_DUTY_CYCLE_MASK;
198 dev_priv->regs.saveBLC_PWM_CTL = (blc_pwm_ctl |
199 (level << BACKLIGHT_DUTY_CYCLE_SHIFT));
204 * Sets the power state for the panel.
206 static void psb_intel_lvds_set_power(struct drm_device *dev, bool on)
208 struct drm_psb_private *dev_priv = to_drm_psb_private(dev);
209 struct psb_intel_mode_device *mode_dev = &dev_priv->mode_dev;
212 if (!gma_power_begin(dev, true)) {
213 dev_err(dev->dev, "set power, chip off!\n");
218 REG_WRITE(PP_CONTROL, REG_READ(PP_CONTROL) |
221 pp_status = REG_READ(PP_STATUS);
222 } while ((pp_status & PP_ON) == 0);
224 psb_intel_lvds_set_backlight(dev,
225 mode_dev->backlight_duty_cycle);
227 psb_intel_lvds_set_backlight(dev, 0);
229 REG_WRITE(PP_CONTROL, REG_READ(PP_CONTROL) &
232 pp_status = REG_READ(PP_STATUS);
233 } while (pp_status & PP_ON);
239 static void psb_intel_lvds_encoder_dpms(struct drm_encoder *encoder, int mode)
241 struct drm_device *dev = encoder->dev;
243 if (mode == DRM_MODE_DPMS_ON)
244 psb_intel_lvds_set_power(dev, true);
246 psb_intel_lvds_set_power(dev, false);
248 /* XXX: We never power down the LVDS pairs. */
251 static void psb_intel_lvds_save(struct drm_connector *connector)
253 struct drm_device *dev = connector->dev;
254 struct drm_psb_private *dev_priv = to_drm_psb_private(dev);
255 struct gma_encoder *gma_encoder = gma_attached_encoder(connector);
256 struct psb_intel_lvds_priv *lvds_priv =
257 (struct psb_intel_lvds_priv *)gma_encoder->dev_priv;
259 lvds_priv->savePP_ON = REG_READ(LVDSPP_ON);
260 lvds_priv->savePP_OFF = REG_READ(LVDSPP_OFF);
261 lvds_priv->saveLVDS = REG_READ(LVDS);
262 lvds_priv->savePP_CONTROL = REG_READ(PP_CONTROL);
263 lvds_priv->savePP_CYCLE = REG_READ(PP_CYCLE);
264 /*lvds_priv->savePP_DIVISOR = REG_READ(PP_DIVISOR);*/
265 lvds_priv->saveBLC_PWM_CTL = REG_READ(BLC_PWM_CTL);
266 lvds_priv->savePFIT_CONTROL = REG_READ(PFIT_CONTROL);
267 lvds_priv->savePFIT_PGM_RATIOS = REG_READ(PFIT_PGM_RATIOS);
269 /*TODO: move backlight_duty_cycle to psb_intel_lvds_priv*/
270 dev_priv->backlight_duty_cycle = (dev_priv->regs.saveBLC_PWM_CTL &
271 BACKLIGHT_DUTY_CYCLE_MASK);
274 * If the light is off at server startup,
275 * just make it full brightness
277 if (dev_priv->backlight_duty_cycle == 0)
278 dev_priv->backlight_duty_cycle =
279 psb_intel_lvds_get_max_backlight(dev);
281 dev_dbg(dev->dev, "(0x%x, 0x%x, 0x%x, 0x%x, 0x%x, 0x%x)\n",
282 lvds_priv->savePP_ON,
283 lvds_priv->savePP_OFF,
285 lvds_priv->savePP_CONTROL,
286 lvds_priv->savePP_CYCLE,
287 lvds_priv->saveBLC_PWM_CTL);
290 static void psb_intel_lvds_restore(struct drm_connector *connector)
292 struct drm_device *dev = connector->dev;
294 struct gma_encoder *gma_encoder = gma_attached_encoder(connector);
295 struct psb_intel_lvds_priv *lvds_priv =
296 (struct psb_intel_lvds_priv *)gma_encoder->dev_priv;
298 dev_dbg(dev->dev, "(0x%x, 0x%x, 0x%x, 0x%x, 0x%x, 0x%x)\n",
299 lvds_priv->savePP_ON,
300 lvds_priv->savePP_OFF,
302 lvds_priv->savePP_CONTROL,
303 lvds_priv->savePP_CYCLE,
304 lvds_priv->saveBLC_PWM_CTL);
306 REG_WRITE(BLC_PWM_CTL, lvds_priv->saveBLC_PWM_CTL);
307 REG_WRITE(PFIT_CONTROL, lvds_priv->savePFIT_CONTROL);
308 REG_WRITE(PFIT_PGM_RATIOS, lvds_priv->savePFIT_PGM_RATIOS);
309 REG_WRITE(LVDSPP_ON, lvds_priv->savePP_ON);
310 REG_WRITE(LVDSPP_OFF, lvds_priv->savePP_OFF);
311 /*REG_WRITE(PP_DIVISOR, lvds_priv->savePP_DIVISOR);*/
312 REG_WRITE(PP_CYCLE, lvds_priv->savePP_CYCLE);
313 REG_WRITE(PP_CONTROL, lvds_priv->savePP_CONTROL);
314 REG_WRITE(LVDS, lvds_priv->saveLVDS);
316 if (lvds_priv->savePP_CONTROL & POWER_TARGET_ON) {
317 REG_WRITE(PP_CONTROL, REG_READ(PP_CONTROL) |
320 pp_status = REG_READ(PP_STATUS);
321 } while ((pp_status & PP_ON) == 0);
323 REG_WRITE(PP_CONTROL, REG_READ(PP_CONTROL) &
326 pp_status = REG_READ(PP_STATUS);
327 } while (pp_status & PP_ON);
331 enum drm_mode_status psb_intel_lvds_mode_valid(struct drm_connector *connector,
332 struct drm_display_mode *mode)
334 struct drm_psb_private *dev_priv = to_drm_psb_private(connector->dev);
335 struct gma_encoder *gma_encoder = gma_attached_encoder(connector);
336 struct drm_display_mode *fixed_mode =
337 dev_priv->mode_dev.panel_fixed_mode;
339 if (gma_encoder->type == INTEL_OUTPUT_MIPI2)
340 fixed_mode = dev_priv->mode_dev.panel_fixed_mode2;
343 if (mode->flags & DRM_MODE_FLAG_DBLSCAN)
344 return MODE_NO_DBLESCAN;
347 if (mode->flags & DRM_MODE_FLAG_INTERLACE)
348 return MODE_NO_INTERLACE;
351 if (mode->hdisplay > fixed_mode->hdisplay)
353 if (mode->vdisplay > fixed_mode->vdisplay)
359 bool psb_intel_lvds_mode_fixup(struct drm_encoder *encoder,
360 const struct drm_display_mode *mode,
361 struct drm_display_mode *adjusted_mode)
363 struct drm_device *dev = encoder->dev;
364 struct drm_psb_private *dev_priv = to_drm_psb_private(dev);
365 struct psb_intel_mode_device *mode_dev = &dev_priv->mode_dev;
366 struct gma_crtc *gma_crtc = to_gma_crtc(encoder->crtc);
367 struct drm_encoder *tmp_encoder;
368 struct drm_display_mode *panel_fixed_mode = mode_dev->panel_fixed_mode;
369 struct gma_encoder *gma_encoder = to_gma_encoder(encoder);
371 if (gma_encoder->type == INTEL_OUTPUT_MIPI2)
372 panel_fixed_mode = mode_dev->panel_fixed_mode2;
374 /* PSB requires the LVDS is on pipe B, MRST has only one pipe anyway */
375 if (!IS_MRST(dev) && gma_crtc->pipe == 0) {
376 pr_err("Can't support LVDS on pipe A\n");
379 if (IS_MRST(dev) && gma_crtc->pipe != 0) {
380 pr_err("Must use PIPE A\n");
383 /* Should never happen!! */
384 list_for_each_entry(tmp_encoder, &dev->mode_config.encoder_list,
386 if (tmp_encoder != encoder
387 && tmp_encoder->crtc == encoder->crtc) {
388 pr_err("Can't enable LVDS and another encoder on the same pipe\n");
394 * If we have timings from the BIOS for the panel, put them in
395 * to the adjusted mode. The CRTC will be set up for this mode,
396 * with the panel scaling set up to source from the H/VDisplay
397 * of the original mode.
399 if (panel_fixed_mode != NULL) {
400 adjusted_mode->hdisplay = panel_fixed_mode->hdisplay;
401 adjusted_mode->hsync_start = panel_fixed_mode->hsync_start;
402 adjusted_mode->hsync_end = panel_fixed_mode->hsync_end;
403 adjusted_mode->htotal = panel_fixed_mode->htotal;
404 adjusted_mode->vdisplay = panel_fixed_mode->vdisplay;
405 adjusted_mode->vsync_start = panel_fixed_mode->vsync_start;
406 adjusted_mode->vsync_end = panel_fixed_mode->vsync_end;
407 adjusted_mode->vtotal = panel_fixed_mode->vtotal;
408 adjusted_mode->clock = panel_fixed_mode->clock;
409 drm_mode_set_crtcinfo(adjusted_mode,
410 CRTC_INTERLACE_HALVE_V);
414 * XXX: It would be nice to support lower refresh rates on the
415 * panels to reduce power consumption, and perhaps match the
416 * user's requested refresh rate.
422 static void psb_intel_lvds_prepare(struct drm_encoder *encoder)
424 struct drm_device *dev = encoder->dev;
425 struct drm_psb_private *dev_priv = to_drm_psb_private(dev);
426 struct psb_intel_mode_device *mode_dev = &dev_priv->mode_dev;
428 if (!gma_power_begin(dev, true))
431 mode_dev->saveBLC_PWM_CTL = REG_READ(BLC_PWM_CTL);
432 mode_dev->backlight_duty_cycle = (mode_dev->saveBLC_PWM_CTL &
433 BACKLIGHT_DUTY_CYCLE_MASK);
435 psb_intel_lvds_set_power(dev, false);
440 static void psb_intel_lvds_commit(struct drm_encoder *encoder)
442 struct drm_device *dev = encoder->dev;
443 struct drm_psb_private *dev_priv = to_drm_psb_private(dev);
444 struct psb_intel_mode_device *mode_dev = &dev_priv->mode_dev;
446 if (mode_dev->backlight_duty_cycle == 0)
447 mode_dev->backlight_duty_cycle =
448 psb_intel_lvds_get_max_backlight(dev);
450 psb_intel_lvds_set_power(dev, true);
453 static void psb_intel_lvds_mode_set(struct drm_encoder *encoder,
454 struct drm_display_mode *mode,
455 struct drm_display_mode *adjusted_mode)
457 struct drm_device *dev = encoder->dev;
458 struct drm_psb_private *dev_priv = to_drm_psb_private(dev);
462 * The LVDS pin pair will already have been turned on in the
463 * psb_intel_crtc_mode_set since it has a large impact on the DPLL
468 * Enable automatic panel scaling so that non-native modes fill the
469 * screen. Should be enabled before the pipe is enabled, according to
470 * register description and PRM.
472 if (mode->hdisplay != adjusted_mode->hdisplay ||
473 mode->vdisplay != adjusted_mode->vdisplay)
474 pfit_control = (PFIT_ENABLE | VERT_AUTO_SCALE |
475 HORIZ_AUTO_SCALE | VERT_INTERP_BILINEAR |
476 HORIZ_INTERP_BILINEAR);
480 if (dev_priv->lvds_dither)
481 pfit_control |= PANEL_8TO6_DITHER_ENABLE;
483 REG_WRITE(PFIT_CONTROL, pfit_control);
487 * Return the list of DDC modes if available, or the BIOS fixed mode otherwise.
489 static int psb_intel_lvds_get_modes(struct drm_connector *connector)
491 struct drm_device *dev = connector->dev;
492 struct drm_psb_private *dev_priv = to_drm_psb_private(dev);
493 struct psb_intel_mode_device *mode_dev = &dev_priv->mode_dev;
497 ret = psb_intel_ddc_get_modes(connector, connector->ddc);
502 if (mode_dev->panel_fixed_mode != NULL) {
503 struct drm_display_mode *mode =
504 drm_mode_duplicate(dev, mode_dev->panel_fixed_mode);
505 drm_mode_probed_add(connector, mode);
512 void psb_intel_lvds_destroy(struct drm_connector *connector)
514 struct gma_connector *gma_connector = to_gma_connector(connector);
515 struct gma_i2c_chan *ddc_bus = to_gma_i2c_chan(connector->ddc);
517 gma_i2c_destroy(ddc_bus);
518 drm_connector_cleanup(connector);
519 kfree(gma_connector);
522 int psb_intel_lvds_set_property(struct drm_connector *connector,
523 struct drm_property *property,
526 struct drm_encoder *encoder = connector->encoder;
531 if (!strcmp(property->name, "scaling mode")) {
532 struct gma_crtc *crtc = to_gma_crtc(encoder->crtc);
539 case DRM_MODE_SCALE_FULLSCREEN:
541 case DRM_MODE_SCALE_NO_SCALE:
543 case DRM_MODE_SCALE_ASPECT:
549 if (drm_object_property_get_value(&connector->base,
557 if (drm_object_property_set_value(&connector->base,
562 if (crtc->saved_mode.hdisplay != 0 &&
563 crtc->saved_mode.vdisplay != 0) {
564 if (!drm_crtc_helper_set_mode(encoder->crtc,
568 encoder->crtc->primary->fb))
571 } else if (!strcmp(property->name, "backlight")) {
572 if (drm_object_property_set_value(&connector->base,
577 gma_backlight_set(encoder->dev, value);
578 } else if (!strcmp(property->name, "DPMS")) {
579 const struct drm_encoder_helper_funcs *hfuncs
580 = encoder->helper_private;
581 hfuncs->dpms(encoder, value);
590 static const struct drm_encoder_helper_funcs psb_intel_lvds_helper_funcs = {
591 .dpms = psb_intel_lvds_encoder_dpms,
592 .mode_fixup = psb_intel_lvds_mode_fixup,
593 .prepare = psb_intel_lvds_prepare,
594 .mode_set = psb_intel_lvds_mode_set,
595 .commit = psb_intel_lvds_commit,
598 const struct drm_connector_helper_funcs
599 psb_intel_lvds_connector_helper_funcs = {
600 .get_modes = psb_intel_lvds_get_modes,
601 .mode_valid = psb_intel_lvds_mode_valid,
602 .best_encoder = gma_best_encoder,
605 const struct drm_connector_funcs psb_intel_lvds_connector_funcs = {
606 .dpms = drm_helper_connector_dpms,
607 .fill_modes = drm_helper_probe_single_connector_modes,
608 .set_property = psb_intel_lvds_set_property,
609 .destroy = psb_intel_lvds_destroy,
613 * psb_intel_lvds_init - setup LVDS connectors on this device
615 * @mode_dev: mode device
617 * Create the connector, register the LVDS DDC bus, and try to figure out what
618 * modes we can display on the LVDS panel (if present).
620 void psb_intel_lvds_init(struct drm_device *dev,
621 struct psb_intel_mode_device *mode_dev)
623 struct gma_encoder *gma_encoder;
624 struct gma_connector *gma_connector;
625 struct psb_intel_lvds_priv *lvds_priv;
626 struct drm_connector *connector;
627 struct drm_encoder *encoder;
628 struct drm_display_mode *scan; /* *modes, *bios_mode; */
629 struct drm_crtc *crtc;
630 struct drm_psb_private *dev_priv = to_drm_psb_private(dev);
631 struct gma_i2c_chan *ddc_bus;
636 gma_encoder = kzalloc(sizeof(struct gma_encoder), GFP_KERNEL);
638 dev_err(dev->dev, "gma_encoder allocation error\n");
641 encoder = &gma_encoder->base;
643 gma_connector = kzalloc(sizeof(struct gma_connector), GFP_KERNEL);
644 if (!gma_connector) {
645 dev_err(dev->dev, "gma_connector allocation error\n");
646 goto err_free_encoder;
649 lvds_priv = kzalloc(sizeof(struct psb_intel_lvds_priv), GFP_KERNEL);
651 dev_err(dev->dev, "LVDS private allocation error\n");
652 goto err_free_connector;
655 gma_encoder->dev_priv = lvds_priv;
657 connector = &gma_connector->base;
658 gma_connector->save = psb_intel_lvds_save;
659 gma_connector->restore = psb_intel_lvds_restore;
661 /* Set up the DDC bus. */
662 ddc_bus = gma_i2c_create(dev, GPIOC, "LVDSDDC_C");
664 dev_printk(KERN_ERR, dev->dev,
665 "DDC bus registration " "failed.\n");
666 goto err_free_lvds_priv;
669 ret = drm_connector_init_with_ddc(dev, connector,
670 &psb_intel_lvds_connector_funcs,
671 DRM_MODE_CONNECTOR_LVDS,
674 goto err_ddc_destroy;
676 ret = drm_simple_encoder_init(dev, encoder, DRM_MODE_ENCODER_LVDS);
678 goto err_connector_cleanup;
680 gma_connector_attach_encoder(gma_connector, gma_encoder);
681 gma_encoder->type = INTEL_OUTPUT_LVDS;
683 drm_encoder_helper_add(encoder, &psb_intel_lvds_helper_funcs);
684 drm_connector_helper_add(connector,
685 &psb_intel_lvds_connector_helper_funcs);
686 connector->display_info.subpixel_order = SubPixelHorizontalRGB;
687 connector->interlace_allowed = false;
688 connector->doublescan_allowed = false;
690 /*Attach connector properties*/
691 drm_object_attach_property(&connector->base,
692 dev->mode_config.scaling_mode_property,
693 DRM_MODE_SCALE_FULLSCREEN);
694 drm_object_attach_property(&connector->base,
695 dev_priv->backlight_property,
696 BRIGHTNESS_MAX_LEVEL);
700 * FIXME: distroy i2c_bus when exit
702 lvds_priv->i2c_bus = gma_i2c_create(dev, GPIOB, "LVDSBLC_B");
703 if (!lvds_priv->i2c_bus) {
705 dev->dev, "I2C bus registration failed.\n");
706 goto err_encoder_cleanup;
708 lvds_priv->i2c_bus->slave_addr = 0x2C;
709 dev_priv->lvds_i2c_bus = lvds_priv->i2c_bus;
713 * 1) check for EDID on DDC
714 * 2) check for VBT data
715 * 3) check to see if LVDS is already on
716 * if none of the above, no panel
717 * 4) make sure lid is open
718 * if closed, act like it's not there for now
722 * Attempt to get the fixed panel mode from DDC. Assume that the
723 * preferred mode is the right one.
725 mutex_lock(&dev->mode_config.mutex);
726 psb_intel_ddc_get_modes(connector, &ddc_bus->base);
728 list_for_each_entry(scan, &connector->probed_modes, head) {
729 if (scan->type & DRM_MODE_TYPE_PREFERRED) {
730 mode_dev->panel_fixed_mode =
731 drm_mode_duplicate(dev, scan);
732 DRM_DEBUG_KMS("Using mode from DDC\n");
733 goto out; /* FIXME: check for quirks */
737 /* Failed to get EDID, what about VBT? do we need this? */
738 if (dev_priv->lfp_lvds_vbt_mode) {
739 mode_dev->panel_fixed_mode =
740 drm_mode_duplicate(dev, dev_priv->lfp_lvds_vbt_mode);
742 if (mode_dev->panel_fixed_mode) {
743 mode_dev->panel_fixed_mode->type |=
744 DRM_MODE_TYPE_PREFERRED;
745 DRM_DEBUG_KMS("Using mode from VBT\n");
751 * If we didn't get EDID, try checking if the panel is already turned
752 * on. If so, assume that whatever is currently programmed is the
755 lvds = REG_READ(LVDS);
756 pipe = (lvds & LVDS_PIPEB_SELECT) ? 1 : 0;
757 crtc = psb_intel_get_crtc_from_pipe(dev, pipe);
759 if (crtc && (lvds & LVDS_PORT_EN)) {
760 mode_dev->panel_fixed_mode =
761 psb_intel_crtc_mode_get(dev, crtc);
762 if (mode_dev->panel_fixed_mode) {
763 mode_dev->panel_fixed_mode->type |=
764 DRM_MODE_TYPE_PREFERRED;
765 DRM_DEBUG_KMS("Using pre-programmed mode\n");
766 goto out; /* FIXME: check for quirks */
770 /* If we still don't have a mode after all that, give up. */
771 if (!mode_dev->panel_fixed_mode) {
772 dev_err(dev->dev, "Found no modes on the lvds, ignoring the LVDS\n");
777 * Blacklist machines with BIOSes that list an LVDS panel without
778 * actually having one.
781 mutex_unlock(&dev->mode_config.mutex);
785 mutex_unlock(&dev->mode_config.mutex);
786 gma_i2c_destroy(lvds_priv->i2c_bus);
788 drm_encoder_cleanup(encoder);
789 err_connector_cleanup:
790 drm_connector_cleanup(connector);
792 gma_i2c_destroy(ddc_bus);
796 kfree(gma_connector);