2 * Copyright © 2006-2010 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>
28 * Chris Wilson <chris@chris-wilson.co.uk>
31 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
33 #include <linux/kernel.h>
34 #include <linux/moduleparam.h>
35 #include <linux/pwm.h>
36 #include "intel_drv.h"
38 #define CRC_PMIC_PWM_PERIOD_NS 21333
41 intel_fixed_panel_mode(const struct drm_display_mode *fixed_mode,
42 struct drm_display_mode *adjusted_mode)
44 drm_mode_copy(adjusted_mode, fixed_mode);
46 drm_mode_set_crtcinfo(adjusted_mode, 0);
50 * intel_find_panel_downclock - find the reduced downclock for LVDS in EDID
52 * @fixed_mode : panel native mode
53 * @connector: LVDS/eDP connector
55 * Return downclock_avail
56 * Find the reduced downclock for LVDS/eDP in EDID.
58 struct drm_display_mode *
59 intel_find_panel_downclock(struct drm_device *dev,
60 struct drm_display_mode *fixed_mode,
61 struct drm_connector *connector)
63 struct drm_display_mode *scan, *tmp_mode;
66 temp_downclock = fixed_mode->clock;
69 list_for_each_entry(scan, &connector->probed_modes, head) {
71 * If one mode has the same resolution with the fixed_panel
72 * mode while they have the different refresh rate, it means
73 * that the reduced downclock is found. In such
74 * case we can set the different FPx0/1 to dynamically select
75 * between low and high frequency.
77 if (scan->hdisplay == fixed_mode->hdisplay &&
78 scan->hsync_start == fixed_mode->hsync_start &&
79 scan->hsync_end == fixed_mode->hsync_end &&
80 scan->htotal == fixed_mode->htotal &&
81 scan->vdisplay == fixed_mode->vdisplay &&
82 scan->vsync_start == fixed_mode->vsync_start &&
83 scan->vsync_end == fixed_mode->vsync_end &&
84 scan->vtotal == fixed_mode->vtotal) {
85 if (scan->clock < temp_downclock) {
87 * The downclock is already found. But we
88 * expect to find the lower downclock.
90 temp_downclock = scan->clock;
96 if (temp_downclock < fixed_mode->clock)
97 return drm_mode_duplicate(dev, tmp_mode);
102 /* adjusted_mode has been preset to be the panel's fixed mode */
104 intel_pch_panel_fitting(struct intel_crtc *intel_crtc,
105 struct intel_crtc_state *pipe_config,
108 struct drm_display_mode *adjusted_mode;
109 int x, y, width, height;
111 adjusted_mode = &pipe_config->base.adjusted_mode;
113 x = y = width = height = 0;
115 /* Native modes don't need fitting */
116 if (adjusted_mode->hdisplay == pipe_config->pipe_src_w &&
117 adjusted_mode->vdisplay == pipe_config->pipe_src_h)
120 switch (fitting_mode) {
121 case DRM_MODE_SCALE_CENTER:
122 width = pipe_config->pipe_src_w;
123 height = pipe_config->pipe_src_h;
124 x = (adjusted_mode->hdisplay - width + 1)/2;
125 y = (adjusted_mode->vdisplay - height + 1)/2;
128 case DRM_MODE_SCALE_ASPECT:
129 /* Scale but preserve the aspect ratio */
131 u32 scaled_width = adjusted_mode->hdisplay
132 * pipe_config->pipe_src_h;
133 u32 scaled_height = pipe_config->pipe_src_w
134 * adjusted_mode->vdisplay;
135 if (scaled_width > scaled_height) { /* pillar */
136 width = scaled_height / pipe_config->pipe_src_h;
139 x = (adjusted_mode->hdisplay - width + 1) / 2;
141 height = adjusted_mode->vdisplay;
142 } else if (scaled_width < scaled_height) { /* letter */
143 height = scaled_width / pipe_config->pipe_src_w;
146 y = (adjusted_mode->vdisplay - height + 1) / 2;
148 width = adjusted_mode->hdisplay;
151 width = adjusted_mode->hdisplay;
152 height = adjusted_mode->vdisplay;
157 case DRM_MODE_SCALE_FULLSCREEN:
159 width = adjusted_mode->hdisplay;
160 height = adjusted_mode->vdisplay;
164 WARN(1, "bad panel fit mode: %d\n", fitting_mode);
169 pipe_config->pch_pfit.pos = (x << 16) | y;
170 pipe_config->pch_pfit.size = (width << 16) | height;
171 pipe_config->pch_pfit.enabled = pipe_config->pch_pfit.size != 0;
175 centre_horizontally(struct drm_display_mode *mode,
178 u32 border, sync_pos, blank_width, sync_width;
180 /* keep the hsync and hblank widths constant */
181 sync_width = mode->crtc_hsync_end - mode->crtc_hsync_start;
182 blank_width = mode->crtc_hblank_end - mode->crtc_hblank_start;
183 sync_pos = (blank_width - sync_width + 1) / 2;
185 border = (mode->hdisplay - width + 1) / 2;
186 border += border & 1; /* make the border even */
188 mode->crtc_hdisplay = width;
189 mode->crtc_hblank_start = width + border;
190 mode->crtc_hblank_end = mode->crtc_hblank_start + blank_width;
192 mode->crtc_hsync_start = mode->crtc_hblank_start + sync_pos;
193 mode->crtc_hsync_end = mode->crtc_hsync_start + sync_width;
197 centre_vertically(struct drm_display_mode *mode,
200 u32 border, sync_pos, blank_width, sync_width;
202 /* keep the vsync and vblank widths constant */
203 sync_width = mode->crtc_vsync_end - mode->crtc_vsync_start;
204 blank_width = mode->crtc_vblank_end - mode->crtc_vblank_start;
205 sync_pos = (blank_width - sync_width + 1) / 2;
207 border = (mode->vdisplay - height + 1) / 2;
209 mode->crtc_vdisplay = height;
210 mode->crtc_vblank_start = height + border;
211 mode->crtc_vblank_end = mode->crtc_vblank_start + blank_width;
213 mode->crtc_vsync_start = mode->crtc_vblank_start + sync_pos;
214 mode->crtc_vsync_end = mode->crtc_vsync_start + sync_width;
217 static inline u32 panel_fitter_scaling(u32 source, u32 target)
220 * Floating point operation is not supported. So the FACTOR
221 * is defined, which can avoid the floating point computation
222 * when calculating the panel ratio.
225 #define FACTOR (1 << ACCURACY)
226 u32 ratio = source * FACTOR / target;
227 return (FACTOR * ratio + FACTOR/2) / FACTOR;
230 static void i965_scale_aspect(struct intel_crtc_state *pipe_config,
233 struct drm_display_mode *adjusted_mode = &pipe_config->base.adjusted_mode;
234 u32 scaled_width = adjusted_mode->hdisplay *
235 pipe_config->pipe_src_h;
236 u32 scaled_height = pipe_config->pipe_src_w *
237 adjusted_mode->vdisplay;
239 /* 965+ is easy, it does everything in hw */
240 if (scaled_width > scaled_height)
241 *pfit_control |= PFIT_ENABLE |
243 else if (scaled_width < scaled_height)
244 *pfit_control |= PFIT_ENABLE |
246 else if (adjusted_mode->hdisplay != pipe_config->pipe_src_w)
247 *pfit_control |= PFIT_ENABLE | PFIT_SCALING_AUTO;
250 static void i9xx_scale_aspect(struct intel_crtc_state *pipe_config,
251 u32 *pfit_control, u32 *pfit_pgm_ratios,
254 struct drm_display_mode *adjusted_mode = &pipe_config->base.adjusted_mode;
255 u32 scaled_width = adjusted_mode->hdisplay *
256 pipe_config->pipe_src_h;
257 u32 scaled_height = pipe_config->pipe_src_w *
258 adjusted_mode->vdisplay;
262 * For earlier chips we have to calculate the scaling
263 * ratio by hand and program it into the
264 * PFIT_PGM_RATIO register
266 if (scaled_width > scaled_height) { /* pillar */
267 centre_horizontally(adjusted_mode,
269 pipe_config->pipe_src_h);
271 *border = LVDS_BORDER_ENABLE;
272 if (pipe_config->pipe_src_h != adjusted_mode->vdisplay) {
273 bits = panel_fitter_scaling(pipe_config->pipe_src_h,
274 adjusted_mode->vdisplay);
276 *pfit_pgm_ratios |= (bits << PFIT_HORIZ_SCALE_SHIFT |
277 bits << PFIT_VERT_SCALE_SHIFT);
278 *pfit_control |= (PFIT_ENABLE |
279 VERT_INTERP_BILINEAR |
280 HORIZ_INTERP_BILINEAR);
282 } else if (scaled_width < scaled_height) { /* letter */
283 centre_vertically(adjusted_mode,
285 pipe_config->pipe_src_w);
287 *border = LVDS_BORDER_ENABLE;
288 if (pipe_config->pipe_src_w != adjusted_mode->hdisplay) {
289 bits = panel_fitter_scaling(pipe_config->pipe_src_w,
290 adjusted_mode->hdisplay);
292 *pfit_pgm_ratios |= (bits << PFIT_HORIZ_SCALE_SHIFT |
293 bits << PFIT_VERT_SCALE_SHIFT);
294 *pfit_control |= (PFIT_ENABLE |
295 VERT_INTERP_BILINEAR |
296 HORIZ_INTERP_BILINEAR);
299 /* Aspects match, Let hw scale both directions */
300 *pfit_control |= (PFIT_ENABLE |
301 VERT_AUTO_SCALE | HORIZ_AUTO_SCALE |
302 VERT_INTERP_BILINEAR |
303 HORIZ_INTERP_BILINEAR);
307 void intel_gmch_panel_fitting(struct intel_crtc *intel_crtc,
308 struct intel_crtc_state *pipe_config,
311 struct drm_device *dev = intel_crtc->base.dev;
312 u32 pfit_control = 0, pfit_pgm_ratios = 0, border = 0;
313 struct drm_display_mode *adjusted_mode;
315 adjusted_mode = &pipe_config->base.adjusted_mode;
317 /* Native modes don't need fitting */
318 if (adjusted_mode->hdisplay == pipe_config->pipe_src_w &&
319 adjusted_mode->vdisplay == pipe_config->pipe_src_h)
322 switch (fitting_mode) {
323 case DRM_MODE_SCALE_CENTER:
325 * For centered modes, we have to calculate border widths &
326 * heights and modify the values programmed into the CRTC.
328 centre_horizontally(adjusted_mode, pipe_config->pipe_src_w);
329 centre_vertically(adjusted_mode, pipe_config->pipe_src_h);
330 border = LVDS_BORDER_ENABLE;
332 case DRM_MODE_SCALE_ASPECT:
333 /* Scale but preserve the aspect ratio */
334 if (INTEL_INFO(dev)->gen >= 4)
335 i965_scale_aspect(pipe_config, &pfit_control);
337 i9xx_scale_aspect(pipe_config, &pfit_control,
338 &pfit_pgm_ratios, &border);
340 case DRM_MODE_SCALE_FULLSCREEN:
342 * Full scaling, even if it changes the aspect ratio.
343 * Fortunately this is all done for us in hw.
345 if (pipe_config->pipe_src_h != adjusted_mode->vdisplay ||
346 pipe_config->pipe_src_w != adjusted_mode->hdisplay) {
347 pfit_control |= PFIT_ENABLE;
348 if (INTEL_INFO(dev)->gen >= 4)
349 pfit_control |= PFIT_SCALING_AUTO;
351 pfit_control |= (VERT_AUTO_SCALE |
352 VERT_INTERP_BILINEAR |
354 HORIZ_INTERP_BILINEAR);
358 WARN(1, "bad panel fit mode: %d\n", fitting_mode);
362 /* 965+ wants fuzzy fitting */
363 /* FIXME: handle multiple panels by failing gracefully */
364 if (INTEL_INFO(dev)->gen >= 4)
365 pfit_control |= ((intel_crtc->pipe << PFIT_PIPE_SHIFT) |
369 if ((pfit_control & PFIT_ENABLE) == 0) {
374 /* Make sure pre-965 set dither correctly for 18bpp panels. */
375 if (INTEL_INFO(dev)->gen < 4 && pipe_config->pipe_bpp == 18)
376 pfit_control |= PANEL_8TO6_DITHER_ENABLE;
378 pipe_config->gmch_pfit.control = pfit_control;
379 pipe_config->gmch_pfit.pgm_ratios = pfit_pgm_ratios;
380 pipe_config->gmch_pfit.lvds_border_bits = border;
383 enum drm_connector_status
384 intel_panel_detect(struct drm_device *dev)
386 struct drm_i915_private *dev_priv = dev->dev_private;
388 /* Assume that the BIOS does not lie through the OpRegion... */
389 if (!i915.panel_ignore_lid && dev_priv->opregion.lid_state) {
390 return ioread32(dev_priv->opregion.lid_state) & 0x1 ?
391 connector_status_connected :
392 connector_status_disconnected;
395 switch (i915.panel_ignore_lid) {
397 return connector_status_connected;
399 return connector_status_disconnected;
401 return connector_status_unknown;
406 * scale - scale values from one range to another
408 * @source_val: value in range [@source_min..@source_max]
410 * Return @source_val in range [@source_min..@source_max] scaled to range
411 * [@target_min..@target_max].
413 static uint32_t scale(uint32_t source_val,
414 uint32_t source_min, uint32_t source_max,
415 uint32_t target_min, uint32_t target_max)
419 WARN_ON(source_min > source_max);
420 WARN_ON(target_min > target_max);
423 source_val = clamp(source_val, source_min, source_max);
425 /* avoid overflows */
426 target_val = DIV_ROUND_CLOSEST_ULL((uint64_t)(source_val - source_min) *
427 (target_max - target_min), source_max - source_min);
428 target_val += target_min;
433 /* Scale user_level in range [0..user_max] to [hw_min..hw_max]. */
434 static inline u32 scale_user_to_hw(struct intel_connector *connector,
435 u32 user_level, u32 user_max)
437 struct intel_panel *panel = &connector->panel;
439 return scale(user_level, 0, user_max,
440 panel->backlight.min, panel->backlight.max);
443 /* Scale user_level in range [0..user_max] to [0..hw_max], clamping the result
444 * to [hw_min..hw_max]. */
445 static inline u32 clamp_user_to_hw(struct intel_connector *connector,
446 u32 user_level, u32 user_max)
448 struct intel_panel *panel = &connector->panel;
451 hw_level = scale(user_level, 0, user_max, 0, panel->backlight.max);
452 hw_level = clamp(hw_level, panel->backlight.min, panel->backlight.max);
457 /* Scale hw_level in range [hw_min..hw_max] to [0..user_max]. */
458 static inline u32 scale_hw_to_user(struct intel_connector *connector,
459 u32 hw_level, u32 user_max)
461 struct intel_panel *panel = &connector->panel;
463 return scale(hw_level, panel->backlight.min, panel->backlight.max,
467 static u32 intel_panel_compute_brightness(struct intel_connector *connector,
470 struct drm_device *dev = connector->base.dev;
471 struct drm_i915_private *dev_priv = dev->dev_private;
472 struct intel_panel *panel = &connector->panel;
474 WARN_ON(panel->backlight.max == 0);
476 if (i915.invert_brightness < 0)
479 if (i915.invert_brightness > 0 ||
480 dev_priv->quirks & QUIRK_INVERT_BRIGHTNESS) {
481 return panel->backlight.max - val;
487 static u32 bdw_get_backlight(struct intel_connector *connector)
489 struct drm_device *dev = connector->base.dev;
490 struct drm_i915_private *dev_priv = dev->dev_private;
492 return I915_READ(BLC_PWM_PCH_CTL2) & BACKLIGHT_DUTY_CYCLE_MASK;
495 static u32 pch_get_backlight(struct intel_connector *connector)
497 struct drm_device *dev = connector->base.dev;
498 struct drm_i915_private *dev_priv = dev->dev_private;
500 return I915_READ(BLC_PWM_CPU_CTL) & BACKLIGHT_DUTY_CYCLE_MASK;
503 static u32 i9xx_get_backlight(struct intel_connector *connector)
505 struct drm_device *dev = connector->base.dev;
506 struct drm_i915_private *dev_priv = dev->dev_private;
507 struct intel_panel *panel = &connector->panel;
510 val = I915_READ(BLC_PWM_CTL) & BACKLIGHT_DUTY_CYCLE_MASK;
511 if (INTEL_INFO(dev)->gen < 4)
514 if (panel->backlight.combination_mode) {
517 pci_read_config_byte(dev->pdev, PCI_LBPC, &lbpc);
524 static u32 _vlv_get_backlight(struct drm_device *dev, enum pipe pipe)
526 struct drm_i915_private *dev_priv = dev->dev_private;
528 if (WARN_ON(pipe != PIPE_A && pipe != PIPE_B))
531 return I915_READ(VLV_BLC_PWM_CTL(pipe)) & BACKLIGHT_DUTY_CYCLE_MASK;
534 static u32 vlv_get_backlight(struct intel_connector *connector)
536 struct drm_device *dev = connector->base.dev;
537 enum pipe pipe = intel_get_pipe_from_connector(connector);
539 return _vlv_get_backlight(dev, pipe);
542 static u32 bxt_get_backlight(struct intel_connector *connector)
544 struct drm_device *dev = connector->base.dev;
545 struct drm_i915_private *dev_priv = dev->dev_private;
547 return I915_READ(BXT_BLC_PWM_DUTY1);
550 static u32 pwm_get_backlight(struct intel_connector *connector)
552 struct intel_panel *panel = &connector->panel;
555 duty_ns = pwm_get_duty_cycle(panel->backlight.pwm);
556 return DIV_ROUND_UP(duty_ns * 100, CRC_PMIC_PWM_PERIOD_NS);
559 static u32 intel_panel_get_backlight(struct intel_connector *connector)
561 struct drm_device *dev = connector->base.dev;
562 struct drm_i915_private *dev_priv = dev->dev_private;
563 struct intel_panel *panel = &connector->panel;
566 mutex_lock(&dev_priv->backlight_lock);
568 if (panel->backlight.enabled) {
569 val = dev_priv->display.get_backlight(connector);
570 val = intel_panel_compute_brightness(connector, val);
573 mutex_unlock(&dev_priv->backlight_lock);
575 DRM_DEBUG_DRIVER("get backlight PWM = %d\n", val);
579 static void bdw_set_backlight(struct intel_connector *connector, u32 level)
581 struct drm_device *dev = connector->base.dev;
582 struct drm_i915_private *dev_priv = dev->dev_private;
583 u32 val = I915_READ(BLC_PWM_PCH_CTL2) & ~BACKLIGHT_DUTY_CYCLE_MASK;
584 I915_WRITE(BLC_PWM_PCH_CTL2, val | level);
587 static void pch_set_backlight(struct intel_connector *connector, u32 level)
589 struct drm_device *dev = connector->base.dev;
590 struct drm_i915_private *dev_priv = dev->dev_private;
593 tmp = I915_READ(BLC_PWM_CPU_CTL) & ~BACKLIGHT_DUTY_CYCLE_MASK;
594 I915_WRITE(BLC_PWM_CPU_CTL, tmp | level);
597 static void i9xx_set_backlight(struct intel_connector *connector, u32 level)
599 struct drm_device *dev = connector->base.dev;
600 struct drm_i915_private *dev_priv = dev->dev_private;
601 struct intel_panel *panel = &connector->panel;
604 WARN_ON(panel->backlight.max == 0);
606 if (panel->backlight.combination_mode) {
609 lbpc = level * 0xfe / panel->backlight.max + 1;
611 pci_write_config_byte(dev->pdev, PCI_LBPC, lbpc);
615 mask = BACKLIGHT_DUTY_CYCLE_MASK;
618 mask = BACKLIGHT_DUTY_CYCLE_MASK_PNV;
621 tmp = I915_READ(BLC_PWM_CTL) & ~mask;
622 I915_WRITE(BLC_PWM_CTL, tmp | level);
625 static void vlv_set_backlight(struct intel_connector *connector, u32 level)
627 struct drm_device *dev = connector->base.dev;
628 struct drm_i915_private *dev_priv = dev->dev_private;
629 enum pipe pipe = intel_get_pipe_from_connector(connector);
632 if (WARN_ON(pipe != PIPE_A && pipe != PIPE_B))
635 tmp = I915_READ(VLV_BLC_PWM_CTL(pipe)) & ~BACKLIGHT_DUTY_CYCLE_MASK;
636 I915_WRITE(VLV_BLC_PWM_CTL(pipe), tmp | level);
639 static void bxt_set_backlight(struct intel_connector *connector, u32 level)
641 struct drm_device *dev = connector->base.dev;
642 struct drm_i915_private *dev_priv = dev->dev_private;
644 I915_WRITE(BXT_BLC_PWM_DUTY1, level);
647 static void pwm_set_backlight(struct intel_connector *connector, u32 level)
649 struct intel_panel *panel = &connector->panel;
650 int duty_ns = DIV_ROUND_UP(level * CRC_PMIC_PWM_PERIOD_NS, 100);
652 pwm_config(panel->backlight.pwm, duty_ns, CRC_PMIC_PWM_PERIOD_NS);
656 intel_panel_actually_set_backlight(struct intel_connector *connector, u32 level)
658 struct drm_device *dev = connector->base.dev;
659 struct drm_i915_private *dev_priv = dev->dev_private;
661 DRM_DEBUG_DRIVER("set backlight PWM = %d\n", level);
663 level = intel_panel_compute_brightness(connector, level);
664 dev_priv->display.set_backlight(connector, level);
667 /* set backlight brightness to level in range [0..max], scaling wrt hw min */
668 static void intel_panel_set_backlight(struct intel_connector *connector,
669 u32 user_level, u32 user_max)
671 struct drm_device *dev = connector->base.dev;
672 struct drm_i915_private *dev_priv = dev->dev_private;
673 struct intel_panel *panel = &connector->panel;
676 if (!panel->backlight.present)
679 mutex_lock(&dev_priv->backlight_lock);
681 WARN_ON(panel->backlight.max == 0);
683 hw_level = scale_user_to_hw(connector, user_level, user_max);
684 panel->backlight.level = hw_level;
686 if (panel->backlight.enabled)
687 intel_panel_actually_set_backlight(connector, hw_level);
689 mutex_unlock(&dev_priv->backlight_lock);
692 /* set backlight brightness to level in range [0..max], assuming hw min is
695 void intel_panel_set_backlight_acpi(struct intel_connector *connector,
696 u32 user_level, u32 user_max)
698 struct drm_device *dev = connector->base.dev;
699 struct drm_i915_private *dev_priv = dev->dev_private;
700 struct intel_panel *panel = &connector->panel;
701 enum pipe pipe = intel_get_pipe_from_connector(connector);
705 * INVALID_PIPE may occur during driver init because
706 * connection_mutex isn't held across the entire backlight
707 * setup + modeset readout, and the BIOS can issue the
708 * requests at any time.
710 if (!panel->backlight.present || pipe == INVALID_PIPE)
713 mutex_lock(&dev_priv->backlight_lock);
715 WARN_ON(panel->backlight.max == 0);
717 hw_level = clamp_user_to_hw(connector, user_level, user_max);
718 panel->backlight.level = hw_level;
720 if (panel->backlight.device)
721 panel->backlight.device->props.brightness =
722 scale_hw_to_user(connector,
723 panel->backlight.level,
724 panel->backlight.device->props.max_brightness);
726 if (panel->backlight.enabled)
727 intel_panel_actually_set_backlight(connector, hw_level);
729 mutex_unlock(&dev_priv->backlight_lock);
732 static void pch_disable_backlight(struct intel_connector *connector)
734 struct drm_device *dev = connector->base.dev;
735 struct drm_i915_private *dev_priv = dev->dev_private;
738 intel_panel_actually_set_backlight(connector, 0);
740 tmp = I915_READ(BLC_PWM_CPU_CTL2);
741 I915_WRITE(BLC_PWM_CPU_CTL2, tmp & ~BLM_PWM_ENABLE);
743 tmp = I915_READ(BLC_PWM_PCH_CTL1);
744 I915_WRITE(BLC_PWM_PCH_CTL1, tmp & ~BLM_PCH_PWM_ENABLE);
747 static void i9xx_disable_backlight(struct intel_connector *connector)
749 intel_panel_actually_set_backlight(connector, 0);
752 static void i965_disable_backlight(struct intel_connector *connector)
754 struct drm_device *dev = connector->base.dev;
755 struct drm_i915_private *dev_priv = dev->dev_private;
758 intel_panel_actually_set_backlight(connector, 0);
760 tmp = I915_READ(BLC_PWM_CTL2);
761 I915_WRITE(BLC_PWM_CTL2, tmp & ~BLM_PWM_ENABLE);
764 static void vlv_disable_backlight(struct intel_connector *connector)
766 struct drm_device *dev = connector->base.dev;
767 struct drm_i915_private *dev_priv = dev->dev_private;
768 enum pipe pipe = intel_get_pipe_from_connector(connector);
771 if (WARN_ON(pipe != PIPE_A && pipe != PIPE_B))
774 intel_panel_actually_set_backlight(connector, 0);
776 tmp = I915_READ(VLV_BLC_PWM_CTL2(pipe));
777 I915_WRITE(VLV_BLC_PWM_CTL2(pipe), tmp & ~BLM_PWM_ENABLE);
780 static void bxt_disable_backlight(struct intel_connector *connector)
782 struct drm_device *dev = connector->base.dev;
783 struct drm_i915_private *dev_priv = dev->dev_private;
786 intel_panel_actually_set_backlight(connector, 0);
788 tmp = I915_READ(BXT_BLC_PWM_CTL1);
789 I915_WRITE(BXT_BLC_PWM_CTL1, tmp & ~BXT_BLC_PWM_ENABLE);
792 static void pwm_disable_backlight(struct intel_connector *connector)
794 struct intel_panel *panel = &connector->panel;
796 /* Disable the backlight */
797 pwm_config(panel->backlight.pwm, 0, CRC_PMIC_PWM_PERIOD_NS);
798 usleep_range(2000, 3000);
799 pwm_disable(panel->backlight.pwm);
802 void intel_panel_disable_backlight(struct intel_connector *connector)
804 struct drm_device *dev = connector->base.dev;
805 struct drm_i915_private *dev_priv = dev->dev_private;
806 struct intel_panel *panel = &connector->panel;
808 if (!panel->backlight.present)
812 * Do not disable backlight on the vgaswitcheroo path. When switching
813 * away from i915, the other client may depend on i915 to handle the
814 * backlight. This will leave the backlight on unnecessarily when
815 * another client is not activated.
817 if (dev->switch_power_state == DRM_SWITCH_POWER_CHANGING) {
818 DRM_DEBUG_DRIVER("Skipping backlight disable on vga switch\n");
822 mutex_lock(&dev_priv->backlight_lock);
824 if (panel->backlight.device)
825 panel->backlight.device->props.power = FB_BLANK_POWERDOWN;
826 panel->backlight.enabled = false;
827 dev_priv->display.disable_backlight(connector);
829 mutex_unlock(&dev_priv->backlight_lock);
832 static void bdw_enable_backlight(struct intel_connector *connector)
834 struct drm_device *dev = connector->base.dev;
835 struct drm_i915_private *dev_priv = dev->dev_private;
836 struct intel_panel *panel = &connector->panel;
837 u32 pch_ctl1, pch_ctl2;
839 pch_ctl1 = I915_READ(BLC_PWM_PCH_CTL1);
840 if (pch_ctl1 & BLM_PCH_PWM_ENABLE) {
841 DRM_DEBUG_KMS("pch backlight already enabled\n");
842 pch_ctl1 &= ~BLM_PCH_PWM_ENABLE;
843 I915_WRITE(BLC_PWM_PCH_CTL1, pch_ctl1);
846 pch_ctl2 = panel->backlight.max << 16;
847 I915_WRITE(BLC_PWM_PCH_CTL2, pch_ctl2);
850 if (panel->backlight.active_low_pwm)
851 pch_ctl1 |= BLM_PCH_POLARITY;
853 /* After LPT, override is the default. */
854 if (HAS_PCH_LPT(dev_priv))
855 pch_ctl1 |= BLM_PCH_OVERRIDE_ENABLE;
857 I915_WRITE(BLC_PWM_PCH_CTL1, pch_ctl1);
858 POSTING_READ(BLC_PWM_PCH_CTL1);
859 I915_WRITE(BLC_PWM_PCH_CTL1, pch_ctl1 | BLM_PCH_PWM_ENABLE);
861 /* This won't stick until the above enable. */
862 intel_panel_actually_set_backlight(connector, panel->backlight.level);
865 static void pch_enable_backlight(struct intel_connector *connector)
867 struct drm_device *dev = connector->base.dev;
868 struct drm_i915_private *dev_priv = dev->dev_private;
869 struct intel_panel *panel = &connector->panel;
870 enum pipe pipe = intel_get_pipe_from_connector(connector);
871 enum transcoder cpu_transcoder =
872 intel_pipe_to_cpu_transcoder(dev_priv, pipe);
873 u32 cpu_ctl2, pch_ctl1, pch_ctl2;
875 cpu_ctl2 = I915_READ(BLC_PWM_CPU_CTL2);
876 if (cpu_ctl2 & BLM_PWM_ENABLE) {
877 DRM_DEBUG_KMS("cpu backlight already enabled\n");
878 cpu_ctl2 &= ~BLM_PWM_ENABLE;
879 I915_WRITE(BLC_PWM_CPU_CTL2, cpu_ctl2);
882 pch_ctl1 = I915_READ(BLC_PWM_PCH_CTL1);
883 if (pch_ctl1 & BLM_PCH_PWM_ENABLE) {
884 DRM_DEBUG_KMS("pch backlight already enabled\n");
885 pch_ctl1 &= ~BLM_PCH_PWM_ENABLE;
886 I915_WRITE(BLC_PWM_PCH_CTL1, pch_ctl1);
889 if (cpu_transcoder == TRANSCODER_EDP)
890 cpu_ctl2 = BLM_TRANSCODER_EDP;
892 cpu_ctl2 = BLM_PIPE(cpu_transcoder);
893 I915_WRITE(BLC_PWM_CPU_CTL2, cpu_ctl2);
894 POSTING_READ(BLC_PWM_CPU_CTL2);
895 I915_WRITE(BLC_PWM_CPU_CTL2, cpu_ctl2 | BLM_PWM_ENABLE);
897 /* This won't stick until the above enable. */
898 intel_panel_actually_set_backlight(connector, panel->backlight.level);
900 pch_ctl2 = panel->backlight.max << 16;
901 I915_WRITE(BLC_PWM_PCH_CTL2, pch_ctl2);
904 if (panel->backlight.active_low_pwm)
905 pch_ctl1 |= BLM_PCH_POLARITY;
907 I915_WRITE(BLC_PWM_PCH_CTL1, pch_ctl1);
908 POSTING_READ(BLC_PWM_PCH_CTL1);
909 I915_WRITE(BLC_PWM_PCH_CTL1, pch_ctl1 | BLM_PCH_PWM_ENABLE);
912 static void i9xx_enable_backlight(struct intel_connector *connector)
914 struct drm_device *dev = connector->base.dev;
915 struct drm_i915_private *dev_priv = dev->dev_private;
916 struct intel_panel *panel = &connector->panel;
919 ctl = I915_READ(BLC_PWM_CTL);
920 if (ctl & BACKLIGHT_DUTY_CYCLE_MASK_PNV) {
921 DRM_DEBUG_KMS("backlight already enabled\n");
922 I915_WRITE(BLC_PWM_CTL, 0);
925 freq = panel->backlight.max;
926 if (panel->backlight.combination_mode)
930 if (panel->backlight.combination_mode)
931 ctl |= BLM_LEGACY_MODE;
932 if (IS_PINEVIEW(dev) && panel->backlight.active_low_pwm)
933 ctl |= BLM_POLARITY_PNV;
935 I915_WRITE(BLC_PWM_CTL, ctl);
936 POSTING_READ(BLC_PWM_CTL);
938 /* XXX: combine this into above write? */
939 intel_panel_actually_set_backlight(connector, panel->backlight.level);
942 * Needed to enable backlight on some 855gm models. BLC_HIST_CTL is
943 * 855gm only, but checking for gen2 is safe, as 855gm is the only gen2
944 * that has backlight.
947 I915_WRITE(BLC_HIST_CTL, BLM_HISTOGRAM_ENABLE);
950 static void i965_enable_backlight(struct intel_connector *connector)
952 struct drm_device *dev = connector->base.dev;
953 struct drm_i915_private *dev_priv = dev->dev_private;
954 struct intel_panel *panel = &connector->panel;
955 enum pipe pipe = intel_get_pipe_from_connector(connector);
958 ctl2 = I915_READ(BLC_PWM_CTL2);
959 if (ctl2 & BLM_PWM_ENABLE) {
960 DRM_DEBUG_KMS("backlight already enabled\n");
961 ctl2 &= ~BLM_PWM_ENABLE;
962 I915_WRITE(BLC_PWM_CTL2, ctl2);
965 freq = panel->backlight.max;
966 if (panel->backlight.combination_mode)
970 I915_WRITE(BLC_PWM_CTL, ctl);
972 ctl2 = BLM_PIPE(pipe);
973 if (panel->backlight.combination_mode)
974 ctl2 |= BLM_COMBINATION_MODE;
975 if (panel->backlight.active_low_pwm)
976 ctl2 |= BLM_POLARITY_I965;
977 I915_WRITE(BLC_PWM_CTL2, ctl2);
978 POSTING_READ(BLC_PWM_CTL2);
979 I915_WRITE(BLC_PWM_CTL2, ctl2 | BLM_PWM_ENABLE);
981 intel_panel_actually_set_backlight(connector, panel->backlight.level);
984 static void vlv_enable_backlight(struct intel_connector *connector)
986 struct drm_device *dev = connector->base.dev;
987 struct drm_i915_private *dev_priv = dev->dev_private;
988 struct intel_panel *panel = &connector->panel;
989 enum pipe pipe = intel_get_pipe_from_connector(connector);
992 if (WARN_ON(pipe != PIPE_A && pipe != PIPE_B))
995 ctl2 = I915_READ(VLV_BLC_PWM_CTL2(pipe));
996 if (ctl2 & BLM_PWM_ENABLE) {
997 DRM_DEBUG_KMS("backlight already enabled\n");
998 ctl2 &= ~BLM_PWM_ENABLE;
999 I915_WRITE(VLV_BLC_PWM_CTL2(pipe), ctl2);
1002 ctl = panel->backlight.max << 16;
1003 I915_WRITE(VLV_BLC_PWM_CTL(pipe), ctl);
1005 /* XXX: combine this into above write? */
1006 intel_panel_actually_set_backlight(connector, panel->backlight.level);
1009 if (panel->backlight.active_low_pwm)
1010 ctl2 |= BLM_POLARITY_I965;
1011 I915_WRITE(VLV_BLC_PWM_CTL2(pipe), ctl2);
1012 POSTING_READ(VLV_BLC_PWM_CTL2(pipe));
1013 I915_WRITE(VLV_BLC_PWM_CTL2(pipe), ctl2 | BLM_PWM_ENABLE);
1016 static void bxt_enable_backlight(struct intel_connector *connector)
1018 struct drm_device *dev = connector->base.dev;
1019 struct drm_i915_private *dev_priv = dev->dev_private;
1020 struct intel_panel *panel = &connector->panel;
1023 pwm_ctl = I915_READ(BXT_BLC_PWM_CTL1);
1024 if (pwm_ctl & BXT_BLC_PWM_ENABLE) {
1025 DRM_DEBUG_KMS("backlight already enabled\n");
1026 pwm_ctl &= ~BXT_BLC_PWM_ENABLE;
1027 I915_WRITE(BXT_BLC_PWM_CTL1, pwm_ctl);
1030 I915_WRITE(BXT_BLC_PWM_FREQ1, panel->backlight.max);
1032 intel_panel_actually_set_backlight(connector, panel->backlight.level);
1035 if (panel->backlight.active_low_pwm)
1036 pwm_ctl |= BXT_BLC_PWM_POLARITY;
1038 I915_WRITE(BXT_BLC_PWM_CTL1, pwm_ctl);
1039 POSTING_READ(BXT_BLC_PWM_CTL1);
1040 I915_WRITE(BXT_BLC_PWM_CTL1, pwm_ctl | BXT_BLC_PWM_ENABLE);
1043 static void pwm_enable_backlight(struct intel_connector *connector)
1045 struct intel_panel *panel = &connector->panel;
1047 pwm_enable(panel->backlight.pwm);
1048 intel_panel_actually_set_backlight(connector, panel->backlight.level);
1051 void intel_panel_enable_backlight(struct intel_connector *connector)
1053 struct drm_device *dev = connector->base.dev;
1054 struct drm_i915_private *dev_priv = dev->dev_private;
1055 struct intel_panel *panel = &connector->panel;
1056 enum pipe pipe = intel_get_pipe_from_connector(connector);
1058 if (!panel->backlight.present)
1061 DRM_DEBUG_KMS("pipe %c\n", pipe_name(pipe));
1063 mutex_lock(&dev_priv->backlight_lock);
1065 WARN_ON(panel->backlight.max == 0);
1067 if (panel->backlight.level <= panel->backlight.min) {
1068 panel->backlight.level = panel->backlight.max;
1069 if (panel->backlight.device)
1070 panel->backlight.device->props.brightness =
1071 scale_hw_to_user(connector,
1072 panel->backlight.level,
1073 panel->backlight.device->props.max_brightness);
1076 dev_priv->display.enable_backlight(connector);
1077 panel->backlight.enabled = true;
1078 if (panel->backlight.device)
1079 panel->backlight.device->props.power = FB_BLANK_UNBLANK;
1081 mutex_unlock(&dev_priv->backlight_lock);
1084 #if IS_ENABLED(CONFIG_BACKLIGHT_CLASS_DEVICE)
1085 static int intel_backlight_device_update_status(struct backlight_device *bd)
1087 struct intel_connector *connector = bl_get_data(bd);
1088 struct intel_panel *panel = &connector->panel;
1089 struct drm_device *dev = connector->base.dev;
1091 drm_modeset_lock(&dev->mode_config.connection_mutex, NULL);
1092 DRM_DEBUG_KMS("updating intel_backlight, brightness=%d/%d\n",
1093 bd->props.brightness, bd->props.max_brightness);
1094 intel_panel_set_backlight(connector, bd->props.brightness,
1095 bd->props.max_brightness);
1098 * Allow flipping bl_power as a sub-state of enabled. Sadly the
1099 * backlight class device does not make it easy to to differentiate
1100 * between callbacks for brightness and bl_power, so our backlight_power
1101 * callback needs to take this into account.
1103 if (panel->backlight.enabled) {
1104 if (panel->backlight_power) {
1105 bool enable = bd->props.power == FB_BLANK_UNBLANK &&
1106 bd->props.brightness != 0;
1107 panel->backlight_power(connector, enable);
1110 bd->props.power = FB_BLANK_POWERDOWN;
1113 drm_modeset_unlock(&dev->mode_config.connection_mutex);
1117 static int intel_backlight_device_get_brightness(struct backlight_device *bd)
1119 struct intel_connector *connector = bl_get_data(bd);
1120 struct drm_device *dev = connector->base.dev;
1121 struct drm_i915_private *dev_priv = dev->dev_private;
1125 intel_runtime_pm_get(dev_priv);
1126 drm_modeset_lock(&dev->mode_config.connection_mutex, NULL);
1128 hw_level = intel_panel_get_backlight(connector);
1129 ret = scale_hw_to_user(connector, hw_level, bd->props.max_brightness);
1131 drm_modeset_unlock(&dev->mode_config.connection_mutex);
1132 intel_runtime_pm_put(dev_priv);
1137 static const struct backlight_ops intel_backlight_device_ops = {
1138 .update_status = intel_backlight_device_update_status,
1139 .get_brightness = intel_backlight_device_get_brightness,
1142 static int intel_backlight_device_register(struct intel_connector *connector)
1144 struct intel_panel *panel = &connector->panel;
1145 struct backlight_properties props;
1147 if (WARN_ON(panel->backlight.device))
1150 if (!panel->backlight.present)
1153 WARN_ON(panel->backlight.max == 0);
1155 memset(&props, 0, sizeof(props));
1156 props.type = BACKLIGHT_RAW;
1159 * Note: Everything should work even if the backlight device max
1160 * presented to the userspace is arbitrarily chosen.
1162 props.max_brightness = panel->backlight.max;
1163 props.brightness = scale_hw_to_user(connector,
1164 panel->backlight.level,
1165 props.max_brightness);
1167 if (panel->backlight.enabled)
1168 props.power = FB_BLANK_UNBLANK;
1170 props.power = FB_BLANK_POWERDOWN;
1173 * Note: using the same name independent of the connector prevents
1174 * registration of multiple backlight devices in the driver.
1176 panel->backlight.device =
1177 backlight_device_register("intel_backlight",
1178 connector->base.kdev,
1180 &intel_backlight_device_ops, &props);
1182 if (IS_ERR(panel->backlight.device)) {
1183 DRM_ERROR("Failed to register backlight: %ld\n",
1184 PTR_ERR(panel->backlight.device));
1185 panel->backlight.device = NULL;
1189 DRM_DEBUG_KMS("Connector %s backlight sysfs interface registered\n",
1190 connector->base.name);
1195 static void intel_backlight_device_unregister(struct intel_connector *connector)
1197 struct intel_panel *panel = &connector->panel;
1199 if (panel->backlight.device) {
1200 backlight_device_unregister(panel->backlight.device);
1201 panel->backlight.device = NULL;
1204 #else /* CONFIG_BACKLIGHT_CLASS_DEVICE */
1205 static int intel_backlight_device_register(struct intel_connector *connector)
1209 static void intel_backlight_device_unregister(struct intel_connector *connector)
1212 #endif /* CONFIG_BACKLIGHT_CLASS_DEVICE */
1215 * Note: The setup hooks can't assume pipe is set!
1217 * XXX: Query mode clock or hardware clock and program PWM modulation frequency
1218 * appropriately when it's 0. Use VBT and/or sane defaults.
1220 static u32 get_backlight_min_vbt(struct intel_connector *connector)
1222 struct drm_device *dev = connector->base.dev;
1223 struct drm_i915_private *dev_priv = dev->dev_private;
1224 struct intel_panel *panel = &connector->panel;
1227 WARN_ON(panel->backlight.max == 0);
1230 * XXX: If the vbt value is 255, it makes min equal to max, which leads
1231 * to problems. There are such machines out there. Either our
1232 * interpretation is wrong or the vbt has bogus data. Or both. Safeguard
1233 * against this by letting the minimum be at most (arbitrarily chosen)
1236 min = clamp_t(int, dev_priv->vbt.backlight.min_brightness, 0, 64);
1237 if (min != dev_priv->vbt.backlight.min_brightness) {
1238 DRM_DEBUG_KMS("clamping VBT min backlight %d/255 to %d/255\n",
1239 dev_priv->vbt.backlight.min_brightness, min);
1242 /* vbt value is a coefficient in range [0..255] */
1243 return scale(min, 0, 255, 0, panel->backlight.max);
1246 static int bdw_setup_backlight(struct intel_connector *connector, enum pipe unused)
1248 struct drm_device *dev = connector->base.dev;
1249 struct drm_i915_private *dev_priv = dev->dev_private;
1250 struct intel_panel *panel = &connector->panel;
1251 u32 pch_ctl1, pch_ctl2, val;
1253 pch_ctl1 = I915_READ(BLC_PWM_PCH_CTL1);
1254 panel->backlight.active_low_pwm = pch_ctl1 & BLM_PCH_POLARITY;
1256 pch_ctl2 = I915_READ(BLC_PWM_PCH_CTL2);
1257 panel->backlight.max = pch_ctl2 >> 16;
1258 if (!panel->backlight.max)
1261 panel->backlight.min = get_backlight_min_vbt(connector);
1263 val = bdw_get_backlight(connector);
1264 panel->backlight.level = intel_panel_compute_brightness(connector, val);
1266 panel->backlight.enabled = (pch_ctl1 & BLM_PCH_PWM_ENABLE) &&
1267 panel->backlight.level != 0;
1272 static int pch_setup_backlight(struct intel_connector *connector, enum pipe unused)
1274 struct drm_device *dev = connector->base.dev;
1275 struct drm_i915_private *dev_priv = dev->dev_private;
1276 struct intel_panel *panel = &connector->panel;
1277 u32 cpu_ctl2, pch_ctl1, pch_ctl2, val;
1279 pch_ctl1 = I915_READ(BLC_PWM_PCH_CTL1);
1280 panel->backlight.active_low_pwm = pch_ctl1 & BLM_PCH_POLARITY;
1282 pch_ctl2 = I915_READ(BLC_PWM_PCH_CTL2);
1283 panel->backlight.max = pch_ctl2 >> 16;
1284 if (!panel->backlight.max)
1287 panel->backlight.min = get_backlight_min_vbt(connector);
1289 val = pch_get_backlight(connector);
1290 panel->backlight.level = intel_panel_compute_brightness(connector, val);
1292 cpu_ctl2 = I915_READ(BLC_PWM_CPU_CTL2);
1293 panel->backlight.enabled = (cpu_ctl2 & BLM_PWM_ENABLE) &&
1294 (pch_ctl1 & BLM_PCH_PWM_ENABLE) && panel->backlight.level != 0;
1299 static int i9xx_setup_backlight(struct intel_connector *connector, enum pipe unused)
1301 struct drm_device *dev = connector->base.dev;
1302 struct drm_i915_private *dev_priv = dev->dev_private;
1303 struct intel_panel *panel = &connector->panel;
1306 ctl = I915_READ(BLC_PWM_CTL);
1308 if (IS_GEN2(dev) || IS_I915GM(dev) || IS_I945GM(dev))
1309 panel->backlight.combination_mode = ctl & BLM_LEGACY_MODE;
1311 if (IS_PINEVIEW(dev))
1312 panel->backlight.active_low_pwm = ctl & BLM_POLARITY_PNV;
1314 panel->backlight.max = ctl >> 17;
1315 if (panel->backlight.combination_mode)
1316 panel->backlight.max *= 0xff;
1318 if (!panel->backlight.max)
1321 panel->backlight.min = get_backlight_min_vbt(connector);
1323 val = i9xx_get_backlight(connector);
1324 panel->backlight.level = intel_panel_compute_brightness(connector, val);
1326 panel->backlight.enabled = panel->backlight.level != 0;
1331 static int i965_setup_backlight(struct intel_connector *connector, enum pipe unused)
1333 struct drm_device *dev = connector->base.dev;
1334 struct drm_i915_private *dev_priv = dev->dev_private;
1335 struct intel_panel *panel = &connector->panel;
1338 ctl2 = I915_READ(BLC_PWM_CTL2);
1339 panel->backlight.combination_mode = ctl2 & BLM_COMBINATION_MODE;
1340 panel->backlight.active_low_pwm = ctl2 & BLM_POLARITY_I965;
1342 ctl = I915_READ(BLC_PWM_CTL);
1343 panel->backlight.max = ctl >> 16;
1344 if (panel->backlight.combination_mode)
1345 panel->backlight.max *= 0xff;
1347 if (!panel->backlight.max)
1350 panel->backlight.min = get_backlight_min_vbt(connector);
1352 val = i9xx_get_backlight(connector);
1353 panel->backlight.level = intel_panel_compute_brightness(connector, val);
1355 panel->backlight.enabled = (ctl2 & BLM_PWM_ENABLE) &&
1356 panel->backlight.level != 0;
1361 static int vlv_setup_backlight(struct intel_connector *connector, enum pipe pipe)
1363 struct drm_device *dev = connector->base.dev;
1364 struct drm_i915_private *dev_priv = dev->dev_private;
1365 struct intel_panel *panel = &connector->panel;
1369 for_each_pipe(dev_priv, p) {
1370 u32 cur_val = I915_READ(VLV_BLC_PWM_CTL(p));
1372 /* Skip if the modulation freq is already set */
1373 if (cur_val & ~BACKLIGHT_DUTY_CYCLE_MASK)
1376 cur_val &= BACKLIGHT_DUTY_CYCLE_MASK;
1377 I915_WRITE(VLV_BLC_PWM_CTL(p), (0xf42 << 16) |
1381 if (WARN_ON(pipe != PIPE_A && pipe != PIPE_B))
1384 ctl2 = I915_READ(VLV_BLC_PWM_CTL2(pipe));
1385 panel->backlight.active_low_pwm = ctl2 & BLM_POLARITY_I965;
1387 ctl = I915_READ(VLV_BLC_PWM_CTL(pipe));
1388 panel->backlight.max = ctl >> 16;
1389 if (!panel->backlight.max)
1392 panel->backlight.min = get_backlight_min_vbt(connector);
1394 val = _vlv_get_backlight(dev, pipe);
1395 panel->backlight.level = intel_panel_compute_brightness(connector, val);
1397 panel->backlight.enabled = (ctl2 & BLM_PWM_ENABLE) &&
1398 panel->backlight.level != 0;
1404 bxt_setup_backlight(struct intel_connector *connector, enum pipe unused)
1406 struct drm_device *dev = connector->base.dev;
1407 struct drm_i915_private *dev_priv = dev->dev_private;
1408 struct intel_panel *panel = &connector->panel;
1411 pwm_ctl = I915_READ(BXT_BLC_PWM_CTL1);
1412 panel->backlight.active_low_pwm = pwm_ctl & BXT_BLC_PWM_POLARITY;
1414 panel->backlight.max = I915_READ(BXT_BLC_PWM_FREQ1);
1415 if (!panel->backlight.max)
1418 val = bxt_get_backlight(connector);
1419 panel->backlight.level = intel_panel_compute_brightness(connector, val);
1421 panel->backlight.enabled = (pwm_ctl & BXT_BLC_PWM_ENABLE) &&
1422 panel->backlight.level != 0;
1427 static int pwm_setup_backlight(struct intel_connector *connector,
1430 struct drm_device *dev = connector->base.dev;
1431 struct intel_panel *panel = &connector->panel;
1434 /* Get the PWM chip for backlight control */
1435 panel->backlight.pwm = pwm_get(dev->dev, "pwm_backlight");
1436 if (IS_ERR(panel->backlight.pwm)) {
1437 DRM_ERROR("Failed to own the pwm chip\n");
1438 panel->backlight.pwm = NULL;
1442 retval = pwm_config(panel->backlight.pwm, CRC_PMIC_PWM_PERIOD_NS,
1443 CRC_PMIC_PWM_PERIOD_NS);
1445 DRM_ERROR("Failed to configure the pwm chip\n");
1446 pwm_put(panel->backlight.pwm);
1447 panel->backlight.pwm = NULL;
1451 panel->backlight.min = 0; /* 0% */
1452 panel->backlight.max = 100; /* 100% */
1453 panel->backlight.level = DIV_ROUND_UP(
1454 pwm_get_duty_cycle(panel->backlight.pwm) * 100,
1455 CRC_PMIC_PWM_PERIOD_NS);
1456 panel->backlight.enabled = panel->backlight.level != 0;
1461 int intel_panel_setup_backlight(struct drm_connector *connector, enum pipe pipe)
1463 struct drm_device *dev = connector->dev;
1464 struct drm_i915_private *dev_priv = dev->dev_private;
1465 struct intel_connector *intel_connector = to_intel_connector(connector);
1466 struct intel_panel *panel = &intel_connector->panel;
1469 if (!dev_priv->vbt.backlight.present) {
1470 if (dev_priv->quirks & QUIRK_BACKLIGHT_PRESENT) {
1471 DRM_DEBUG_KMS("no backlight present per VBT, but present per quirk\n");
1473 DRM_DEBUG_KMS("no backlight present per VBT\n");
1478 /* set level and max in panel struct */
1479 mutex_lock(&dev_priv->backlight_lock);
1480 ret = dev_priv->display.setup_backlight(intel_connector, pipe);
1481 mutex_unlock(&dev_priv->backlight_lock);
1484 DRM_DEBUG_KMS("failed to setup backlight for connector %s\n",
1489 panel->backlight.present = true;
1491 DRM_DEBUG_KMS("Connector %s backlight initialized, %s, brightness %u/%u\n",
1493 panel->backlight.enabled ? "enabled" : "disabled",
1494 panel->backlight.level, panel->backlight.max);
1499 void intel_panel_destroy_backlight(struct drm_connector *connector)
1501 struct intel_connector *intel_connector = to_intel_connector(connector);
1502 struct intel_panel *panel = &intel_connector->panel;
1504 /* dispose of the pwm */
1505 if (panel->backlight.pwm)
1506 pwm_put(panel->backlight.pwm);
1508 panel->backlight.present = false;
1511 /* Set up chip specific backlight functions */
1512 void intel_panel_init_backlight_funcs(struct drm_device *dev)
1514 struct drm_i915_private *dev_priv = dev->dev_private;
1516 if (IS_BROXTON(dev)) {
1517 dev_priv->display.setup_backlight = bxt_setup_backlight;
1518 dev_priv->display.enable_backlight = bxt_enable_backlight;
1519 dev_priv->display.disable_backlight = bxt_disable_backlight;
1520 dev_priv->display.set_backlight = bxt_set_backlight;
1521 dev_priv->display.get_backlight = bxt_get_backlight;
1522 } else if (IS_BROADWELL(dev) || IS_SKYLAKE(dev)) {
1523 dev_priv->display.setup_backlight = bdw_setup_backlight;
1524 dev_priv->display.enable_backlight = bdw_enable_backlight;
1525 dev_priv->display.disable_backlight = pch_disable_backlight;
1526 dev_priv->display.set_backlight = bdw_set_backlight;
1527 dev_priv->display.get_backlight = bdw_get_backlight;
1528 } else if (HAS_PCH_SPLIT(dev)) {
1529 dev_priv->display.setup_backlight = pch_setup_backlight;
1530 dev_priv->display.enable_backlight = pch_enable_backlight;
1531 dev_priv->display.disable_backlight = pch_disable_backlight;
1532 dev_priv->display.set_backlight = pch_set_backlight;
1533 dev_priv->display.get_backlight = pch_get_backlight;
1534 } else if (IS_VALLEYVIEW(dev)) {
1535 if (dev_priv->vbt.has_mipi) {
1536 dev_priv->display.setup_backlight = pwm_setup_backlight;
1537 dev_priv->display.enable_backlight = pwm_enable_backlight;
1538 dev_priv->display.disable_backlight = pwm_disable_backlight;
1539 dev_priv->display.set_backlight = pwm_set_backlight;
1540 dev_priv->display.get_backlight = pwm_get_backlight;
1542 dev_priv->display.setup_backlight = vlv_setup_backlight;
1543 dev_priv->display.enable_backlight = vlv_enable_backlight;
1544 dev_priv->display.disable_backlight = vlv_disable_backlight;
1545 dev_priv->display.set_backlight = vlv_set_backlight;
1546 dev_priv->display.get_backlight = vlv_get_backlight;
1548 } else if (IS_GEN4(dev)) {
1549 dev_priv->display.setup_backlight = i965_setup_backlight;
1550 dev_priv->display.enable_backlight = i965_enable_backlight;
1551 dev_priv->display.disable_backlight = i965_disable_backlight;
1552 dev_priv->display.set_backlight = i9xx_set_backlight;
1553 dev_priv->display.get_backlight = i9xx_get_backlight;
1555 dev_priv->display.setup_backlight = i9xx_setup_backlight;
1556 dev_priv->display.enable_backlight = i9xx_enable_backlight;
1557 dev_priv->display.disable_backlight = i9xx_disable_backlight;
1558 dev_priv->display.set_backlight = i9xx_set_backlight;
1559 dev_priv->display.get_backlight = i9xx_get_backlight;
1563 int intel_panel_init(struct intel_panel *panel,
1564 struct drm_display_mode *fixed_mode,
1565 struct drm_display_mode *downclock_mode)
1567 panel->fixed_mode = fixed_mode;
1568 panel->downclock_mode = downclock_mode;
1573 void intel_panel_fini(struct intel_panel *panel)
1575 struct intel_connector *intel_connector =
1576 container_of(panel, struct intel_connector, panel);
1578 if (panel->fixed_mode)
1579 drm_mode_destroy(intel_connector->base.dev, panel->fixed_mode);
1581 if (panel->downclock_mode)
1582 drm_mode_destroy(intel_connector->base.dev,
1583 panel->downclock_mode);
1586 void intel_backlight_register(struct drm_device *dev)
1588 struct intel_connector *connector;
1590 list_for_each_entry(connector, &dev->mode_config.connector_list, base.head)
1591 intel_backlight_device_register(connector);
1594 void intel_backlight_unregister(struct drm_device *dev)
1596 struct intel_connector *connector;
1598 list_for_each_entry(connector, &dev->mode_config.connector_list, base.head)
1599 intel_backlight_device_unregister(connector);