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 const struct drm_display_mode *adjusted_mode = &pipe_config->base.adjusted_mode;
109 int x = 0, y = 0, width = 0, height = 0;
111 /* Native modes don't need fitting */
112 if (adjusted_mode->crtc_hdisplay == pipe_config->pipe_src_w &&
113 adjusted_mode->crtc_vdisplay == pipe_config->pipe_src_h)
116 switch (fitting_mode) {
117 case DRM_MODE_SCALE_CENTER:
118 width = pipe_config->pipe_src_w;
119 height = pipe_config->pipe_src_h;
120 x = (adjusted_mode->crtc_hdisplay - width + 1)/2;
121 y = (adjusted_mode->crtc_vdisplay - height + 1)/2;
124 case DRM_MODE_SCALE_ASPECT:
125 /* Scale but preserve the aspect ratio */
127 u32 scaled_width = adjusted_mode->crtc_hdisplay
128 * pipe_config->pipe_src_h;
129 u32 scaled_height = pipe_config->pipe_src_w
130 * adjusted_mode->crtc_vdisplay;
131 if (scaled_width > scaled_height) { /* pillar */
132 width = scaled_height / pipe_config->pipe_src_h;
135 x = (adjusted_mode->crtc_hdisplay - width + 1) / 2;
137 height = adjusted_mode->crtc_vdisplay;
138 } else if (scaled_width < scaled_height) { /* letter */
139 height = scaled_width / pipe_config->pipe_src_w;
142 y = (adjusted_mode->crtc_vdisplay - height + 1) / 2;
144 width = adjusted_mode->crtc_hdisplay;
147 width = adjusted_mode->crtc_hdisplay;
148 height = adjusted_mode->crtc_vdisplay;
153 case DRM_MODE_SCALE_FULLSCREEN:
155 width = adjusted_mode->crtc_hdisplay;
156 height = adjusted_mode->crtc_vdisplay;
160 WARN(1, "bad panel fit mode: %d\n", fitting_mode);
165 pipe_config->pch_pfit.pos = (x << 16) | y;
166 pipe_config->pch_pfit.size = (width << 16) | height;
167 pipe_config->pch_pfit.enabled = pipe_config->pch_pfit.size != 0;
171 centre_horizontally(struct drm_display_mode *adjusted_mode,
174 u32 border, sync_pos, blank_width, sync_width;
176 /* keep the hsync and hblank widths constant */
177 sync_width = adjusted_mode->crtc_hsync_end - adjusted_mode->crtc_hsync_start;
178 blank_width = adjusted_mode->crtc_hblank_end - adjusted_mode->crtc_hblank_start;
179 sync_pos = (blank_width - sync_width + 1) / 2;
181 border = (adjusted_mode->crtc_hdisplay - width + 1) / 2;
182 border += border & 1; /* make the border even */
184 adjusted_mode->crtc_hdisplay = width;
185 adjusted_mode->crtc_hblank_start = width + border;
186 adjusted_mode->crtc_hblank_end = adjusted_mode->crtc_hblank_start + blank_width;
188 adjusted_mode->crtc_hsync_start = adjusted_mode->crtc_hblank_start + sync_pos;
189 adjusted_mode->crtc_hsync_end = adjusted_mode->crtc_hsync_start + sync_width;
193 centre_vertically(struct drm_display_mode *adjusted_mode,
196 u32 border, sync_pos, blank_width, sync_width;
198 /* keep the vsync and vblank widths constant */
199 sync_width = adjusted_mode->crtc_vsync_end - adjusted_mode->crtc_vsync_start;
200 blank_width = adjusted_mode->crtc_vblank_end - adjusted_mode->crtc_vblank_start;
201 sync_pos = (blank_width - sync_width + 1) / 2;
203 border = (adjusted_mode->crtc_vdisplay - height + 1) / 2;
205 adjusted_mode->crtc_vdisplay = height;
206 adjusted_mode->crtc_vblank_start = height + border;
207 adjusted_mode->crtc_vblank_end = adjusted_mode->crtc_vblank_start + blank_width;
209 adjusted_mode->crtc_vsync_start = adjusted_mode->crtc_vblank_start + sync_pos;
210 adjusted_mode->crtc_vsync_end = adjusted_mode->crtc_vsync_start + sync_width;
213 static inline u32 panel_fitter_scaling(u32 source, u32 target)
216 * Floating point operation is not supported. So the FACTOR
217 * is defined, which can avoid the floating point computation
218 * when calculating the panel ratio.
221 #define FACTOR (1 << ACCURACY)
222 u32 ratio = source * FACTOR / target;
223 return (FACTOR * ratio + FACTOR/2) / FACTOR;
226 static void i965_scale_aspect(struct intel_crtc_state *pipe_config,
229 const struct drm_display_mode *adjusted_mode = &pipe_config->base.adjusted_mode;
230 u32 scaled_width = adjusted_mode->crtc_hdisplay *
231 pipe_config->pipe_src_h;
232 u32 scaled_height = pipe_config->pipe_src_w *
233 adjusted_mode->crtc_vdisplay;
235 /* 965+ is easy, it does everything in hw */
236 if (scaled_width > scaled_height)
237 *pfit_control |= PFIT_ENABLE |
239 else if (scaled_width < scaled_height)
240 *pfit_control |= PFIT_ENABLE |
242 else if (adjusted_mode->crtc_hdisplay != pipe_config->pipe_src_w)
243 *pfit_control |= PFIT_ENABLE | PFIT_SCALING_AUTO;
246 static void i9xx_scale_aspect(struct intel_crtc_state *pipe_config,
247 u32 *pfit_control, u32 *pfit_pgm_ratios,
250 struct drm_display_mode *adjusted_mode = &pipe_config->base.adjusted_mode;
251 u32 scaled_width = adjusted_mode->crtc_hdisplay *
252 pipe_config->pipe_src_h;
253 u32 scaled_height = pipe_config->pipe_src_w *
254 adjusted_mode->crtc_vdisplay;
258 * For earlier chips we have to calculate the scaling
259 * ratio by hand and program it into the
260 * PFIT_PGM_RATIO register
262 if (scaled_width > scaled_height) { /* pillar */
263 centre_horizontally(adjusted_mode,
265 pipe_config->pipe_src_h);
267 *border = LVDS_BORDER_ENABLE;
268 if (pipe_config->pipe_src_h != adjusted_mode->crtc_vdisplay) {
269 bits = panel_fitter_scaling(pipe_config->pipe_src_h,
270 adjusted_mode->crtc_vdisplay);
272 *pfit_pgm_ratios |= (bits << PFIT_HORIZ_SCALE_SHIFT |
273 bits << PFIT_VERT_SCALE_SHIFT);
274 *pfit_control |= (PFIT_ENABLE |
275 VERT_INTERP_BILINEAR |
276 HORIZ_INTERP_BILINEAR);
278 } else if (scaled_width < scaled_height) { /* letter */
279 centre_vertically(adjusted_mode,
281 pipe_config->pipe_src_w);
283 *border = LVDS_BORDER_ENABLE;
284 if (pipe_config->pipe_src_w != adjusted_mode->crtc_hdisplay) {
285 bits = panel_fitter_scaling(pipe_config->pipe_src_w,
286 adjusted_mode->crtc_hdisplay);
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);
295 /* Aspects match, Let hw scale both directions */
296 *pfit_control |= (PFIT_ENABLE |
297 VERT_AUTO_SCALE | HORIZ_AUTO_SCALE |
298 VERT_INTERP_BILINEAR |
299 HORIZ_INTERP_BILINEAR);
303 void intel_gmch_panel_fitting(struct intel_crtc *intel_crtc,
304 struct intel_crtc_state *pipe_config,
307 struct drm_device *dev = intel_crtc->base.dev;
308 u32 pfit_control = 0, pfit_pgm_ratios = 0, border = 0;
309 struct drm_display_mode *adjusted_mode = &pipe_config->base.adjusted_mode;
311 /* Native modes don't need fitting */
312 if (adjusted_mode->crtc_hdisplay == pipe_config->pipe_src_w &&
313 adjusted_mode->crtc_vdisplay == pipe_config->pipe_src_h)
316 switch (fitting_mode) {
317 case DRM_MODE_SCALE_CENTER:
319 * For centered modes, we have to calculate border widths &
320 * heights and modify the values programmed into the CRTC.
322 centre_horizontally(adjusted_mode, pipe_config->pipe_src_w);
323 centre_vertically(adjusted_mode, pipe_config->pipe_src_h);
324 border = LVDS_BORDER_ENABLE;
326 case DRM_MODE_SCALE_ASPECT:
327 /* Scale but preserve the aspect ratio */
328 if (INTEL_INFO(dev)->gen >= 4)
329 i965_scale_aspect(pipe_config, &pfit_control);
331 i9xx_scale_aspect(pipe_config, &pfit_control,
332 &pfit_pgm_ratios, &border);
334 case DRM_MODE_SCALE_FULLSCREEN:
336 * Full scaling, even if it changes the aspect ratio.
337 * Fortunately this is all done for us in hw.
339 if (pipe_config->pipe_src_h != adjusted_mode->crtc_vdisplay ||
340 pipe_config->pipe_src_w != adjusted_mode->crtc_hdisplay) {
341 pfit_control |= PFIT_ENABLE;
342 if (INTEL_INFO(dev)->gen >= 4)
343 pfit_control |= PFIT_SCALING_AUTO;
345 pfit_control |= (VERT_AUTO_SCALE |
346 VERT_INTERP_BILINEAR |
348 HORIZ_INTERP_BILINEAR);
352 WARN(1, "bad panel fit mode: %d\n", fitting_mode);
356 /* 965+ wants fuzzy fitting */
357 /* FIXME: handle multiple panels by failing gracefully */
358 if (INTEL_INFO(dev)->gen >= 4)
359 pfit_control |= ((intel_crtc->pipe << PFIT_PIPE_SHIFT) |
363 if ((pfit_control & PFIT_ENABLE) == 0) {
368 /* Make sure pre-965 set dither correctly for 18bpp panels. */
369 if (INTEL_INFO(dev)->gen < 4 && pipe_config->pipe_bpp == 18)
370 pfit_control |= PANEL_8TO6_DITHER_ENABLE;
372 pipe_config->gmch_pfit.control = pfit_control;
373 pipe_config->gmch_pfit.pgm_ratios = pfit_pgm_ratios;
374 pipe_config->gmch_pfit.lvds_border_bits = border;
377 enum drm_connector_status
378 intel_panel_detect(struct drm_device *dev)
380 struct drm_i915_private *dev_priv = dev->dev_private;
382 /* Assume that the BIOS does not lie through the OpRegion... */
383 if (!i915.panel_ignore_lid && dev_priv->opregion.lid_state) {
384 return *dev_priv->opregion.lid_state & 0x1 ?
385 connector_status_connected :
386 connector_status_disconnected;
389 switch (i915.panel_ignore_lid) {
391 return connector_status_connected;
393 return connector_status_disconnected;
395 return connector_status_unknown;
400 * scale - scale values from one range to another
402 * @source_val: value in range [@source_min..@source_max]
404 * Return @source_val in range [@source_min..@source_max] scaled to range
405 * [@target_min..@target_max].
407 static uint32_t scale(uint32_t source_val,
408 uint32_t source_min, uint32_t source_max,
409 uint32_t target_min, uint32_t target_max)
413 WARN_ON(source_min > source_max);
414 WARN_ON(target_min > target_max);
417 source_val = clamp(source_val, source_min, source_max);
419 /* avoid overflows */
420 target_val = DIV_ROUND_CLOSEST_ULL((uint64_t)(source_val - source_min) *
421 (target_max - target_min), source_max - source_min);
422 target_val += target_min;
427 /* Scale user_level in range [0..user_max] to [hw_min..hw_max]. */
428 static inline u32 scale_user_to_hw(struct intel_connector *connector,
429 u32 user_level, u32 user_max)
431 struct intel_panel *panel = &connector->panel;
433 return scale(user_level, 0, user_max,
434 panel->backlight.min, panel->backlight.max);
437 /* Scale user_level in range [0..user_max] to [0..hw_max], clamping the result
438 * to [hw_min..hw_max]. */
439 static inline u32 clamp_user_to_hw(struct intel_connector *connector,
440 u32 user_level, u32 user_max)
442 struct intel_panel *panel = &connector->panel;
445 hw_level = scale(user_level, 0, user_max, 0, panel->backlight.max);
446 hw_level = clamp(hw_level, panel->backlight.min, panel->backlight.max);
451 /* Scale hw_level in range [hw_min..hw_max] to [0..user_max]. */
452 static inline u32 scale_hw_to_user(struct intel_connector *connector,
453 u32 hw_level, u32 user_max)
455 struct intel_panel *panel = &connector->panel;
457 return scale(hw_level, panel->backlight.min, panel->backlight.max,
461 static u32 intel_panel_compute_brightness(struct intel_connector *connector,
464 struct drm_device *dev = connector->base.dev;
465 struct drm_i915_private *dev_priv = dev->dev_private;
466 struct intel_panel *panel = &connector->panel;
468 WARN_ON(panel->backlight.max == 0);
470 if (i915.invert_brightness < 0)
473 if (i915.invert_brightness > 0 ||
474 dev_priv->quirks & QUIRK_INVERT_BRIGHTNESS) {
475 return panel->backlight.max - val;
481 static u32 lpt_get_backlight(struct intel_connector *connector)
483 struct drm_device *dev = connector->base.dev;
484 struct drm_i915_private *dev_priv = dev->dev_private;
486 return I915_READ(BLC_PWM_PCH_CTL2) & BACKLIGHT_DUTY_CYCLE_MASK;
489 static u32 pch_get_backlight(struct intel_connector *connector)
491 struct drm_device *dev = connector->base.dev;
492 struct drm_i915_private *dev_priv = dev->dev_private;
494 return I915_READ(BLC_PWM_CPU_CTL) & BACKLIGHT_DUTY_CYCLE_MASK;
497 static u32 i9xx_get_backlight(struct intel_connector *connector)
499 struct drm_device *dev = connector->base.dev;
500 struct drm_i915_private *dev_priv = dev->dev_private;
501 struct intel_panel *panel = &connector->panel;
504 val = I915_READ(BLC_PWM_CTL) & BACKLIGHT_DUTY_CYCLE_MASK;
505 if (INTEL_INFO(dev)->gen < 4)
508 if (panel->backlight.combination_mode) {
511 pci_read_config_byte(dev->pdev, PCI_LBPC, &lbpc);
518 static u32 _vlv_get_backlight(struct drm_device *dev, enum pipe pipe)
520 struct drm_i915_private *dev_priv = dev->dev_private;
522 if (WARN_ON(pipe != PIPE_A && pipe != PIPE_B))
525 return I915_READ(VLV_BLC_PWM_CTL(pipe)) & BACKLIGHT_DUTY_CYCLE_MASK;
528 static u32 vlv_get_backlight(struct intel_connector *connector)
530 struct drm_device *dev = connector->base.dev;
531 enum pipe pipe = intel_get_pipe_from_connector(connector);
533 return _vlv_get_backlight(dev, pipe);
536 static u32 bxt_get_backlight(struct intel_connector *connector)
538 struct drm_device *dev = connector->base.dev;
539 struct intel_panel *panel = &connector->panel;
540 struct drm_i915_private *dev_priv = dev->dev_private;
542 return I915_READ(BXT_BLC_PWM_DUTY(panel->backlight.controller));
545 static u32 pwm_get_backlight(struct intel_connector *connector)
547 struct intel_panel *panel = &connector->panel;
550 duty_ns = pwm_get_duty_cycle(panel->backlight.pwm);
551 return DIV_ROUND_UP(duty_ns * 100, CRC_PMIC_PWM_PERIOD_NS);
554 static u32 intel_panel_get_backlight(struct intel_connector *connector)
556 struct drm_device *dev = connector->base.dev;
557 struct drm_i915_private *dev_priv = dev->dev_private;
558 struct intel_panel *panel = &connector->panel;
561 mutex_lock(&dev_priv->backlight_lock);
563 if (panel->backlight.enabled) {
564 val = panel->backlight.get(connector);
565 val = intel_panel_compute_brightness(connector, val);
568 mutex_unlock(&dev_priv->backlight_lock);
570 DRM_DEBUG_DRIVER("get backlight PWM = %d\n", val);
574 static void lpt_set_backlight(struct intel_connector *connector, u32 level)
576 struct drm_device *dev = connector->base.dev;
577 struct drm_i915_private *dev_priv = dev->dev_private;
578 u32 val = I915_READ(BLC_PWM_PCH_CTL2) & ~BACKLIGHT_DUTY_CYCLE_MASK;
579 I915_WRITE(BLC_PWM_PCH_CTL2, val | level);
582 static void pch_set_backlight(struct intel_connector *connector, u32 level)
584 struct drm_device *dev = connector->base.dev;
585 struct drm_i915_private *dev_priv = dev->dev_private;
588 tmp = I915_READ(BLC_PWM_CPU_CTL) & ~BACKLIGHT_DUTY_CYCLE_MASK;
589 I915_WRITE(BLC_PWM_CPU_CTL, tmp | level);
592 static void i9xx_set_backlight(struct intel_connector *connector, u32 level)
594 struct drm_device *dev = connector->base.dev;
595 struct drm_i915_private *dev_priv = dev->dev_private;
596 struct intel_panel *panel = &connector->panel;
599 WARN_ON(panel->backlight.max == 0);
601 if (panel->backlight.combination_mode) {
604 lbpc = level * 0xfe / panel->backlight.max + 1;
606 pci_write_config_byte(dev->pdev, PCI_LBPC, lbpc);
610 mask = BACKLIGHT_DUTY_CYCLE_MASK;
613 mask = BACKLIGHT_DUTY_CYCLE_MASK_PNV;
616 tmp = I915_READ(BLC_PWM_CTL) & ~mask;
617 I915_WRITE(BLC_PWM_CTL, tmp | level);
620 static void vlv_set_backlight(struct intel_connector *connector, u32 level)
622 struct drm_device *dev = connector->base.dev;
623 struct drm_i915_private *dev_priv = dev->dev_private;
624 enum pipe pipe = intel_get_pipe_from_connector(connector);
627 if (WARN_ON(pipe != PIPE_A && pipe != PIPE_B))
630 tmp = I915_READ(VLV_BLC_PWM_CTL(pipe)) & ~BACKLIGHT_DUTY_CYCLE_MASK;
631 I915_WRITE(VLV_BLC_PWM_CTL(pipe), tmp | level);
634 static void bxt_set_backlight(struct intel_connector *connector, u32 level)
636 struct drm_device *dev = connector->base.dev;
637 struct drm_i915_private *dev_priv = dev->dev_private;
638 struct intel_panel *panel = &connector->panel;
640 I915_WRITE(BXT_BLC_PWM_DUTY(panel->backlight.controller), level);
643 static void pwm_set_backlight(struct intel_connector *connector, u32 level)
645 struct intel_panel *panel = &connector->panel;
646 int duty_ns = DIV_ROUND_UP(level * CRC_PMIC_PWM_PERIOD_NS, 100);
648 pwm_config(panel->backlight.pwm, duty_ns, CRC_PMIC_PWM_PERIOD_NS);
652 intel_panel_actually_set_backlight(struct intel_connector *connector, u32 level)
654 struct intel_panel *panel = &connector->panel;
656 DRM_DEBUG_DRIVER("set backlight PWM = %d\n", level);
658 level = intel_panel_compute_brightness(connector, level);
659 panel->backlight.set(connector, level);
662 /* set backlight brightness to level in range [0..max], scaling wrt hw min */
663 static void intel_panel_set_backlight(struct intel_connector *connector,
664 u32 user_level, u32 user_max)
666 struct drm_device *dev = connector->base.dev;
667 struct drm_i915_private *dev_priv = dev->dev_private;
668 struct intel_panel *panel = &connector->panel;
671 if (!panel->backlight.present)
674 mutex_lock(&dev_priv->backlight_lock);
676 WARN_ON(panel->backlight.max == 0);
678 hw_level = scale_user_to_hw(connector, user_level, user_max);
679 panel->backlight.level = hw_level;
681 if (panel->backlight.enabled)
682 intel_panel_actually_set_backlight(connector, hw_level);
684 mutex_unlock(&dev_priv->backlight_lock);
687 /* set backlight brightness to level in range [0..max], assuming hw min is
690 void intel_panel_set_backlight_acpi(struct intel_connector *connector,
691 u32 user_level, u32 user_max)
693 struct drm_device *dev = connector->base.dev;
694 struct drm_i915_private *dev_priv = dev->dev_private;
695 struct intel_panel *panel = &connector->panel;
696 enum pipe pipe = intel_get_pipe_from_connector(connector);
700 * INVALID_PIPE may occur during driver init because
701 * connection_mutex isn't held across the entire backlight
702 * setup + modeset readout, and the BIOS can issue the
703 * requests at any time.
705 if (!panel->backlight.present || pipe == INVALID_PIPE)
708 mutex_lock(&dev_priv->backlight_lock);
710 WARN_ON(panel->backlight.max == 0);
712 hw_level = clamp_user_to_hw(connector, user_level, user_max);
713 panel->backlight.level = hw_level;
715 if (panel->backlight.device)
716 panel->backlight.device->props.brightness =
717 scale_hw_to_user(connector,
718 panel->backlight.level,
719 panel->backlight.device->props.max_brightness);
721 if (panel->backlight.enabled)
722 intel_panel_actually_set_backlight(connector, hw_level);
724 mutex_unlock(&dev_priv->backlight_lock);
727 static void lpt_disable_backlight(struct intel_connector *connector)
729 struct drm_device *dev = connector->base.dev;
730 struct drm_i915_private *dev_priv = dev->dev_private;
733 intel_panel_actually_set_backlight(connector, 0);
736 * Although we don't support or enable CPU PWM with LPT/SPT based
737 * systems, it may have been enabled prior to loading the
738 * driver. Disable to avoid warnings on LCPLL disable.
740 * This needs rework if we need to add support for CPU PWM on PCH split
743 tmp = I915_READ(BLC_PWM_CPU_CTL2);
744 if (tmp & BLM_PWM_ENABLE) {
745 DRM_DEBUG_KMS("cpu backlight was enabled, disabling\n");
746 I915_WRITE(BLC_PWM_CPU_CTL2, tmp & ~BLM_PWM_ENABLE);
749 tmp = I915_READ(BLC_PWM_PCH_CTL1);
750 I915_WRITE(BLC_PWM_PCH_CTL1, tmp & ~BLM_PCH_PWM_ENABLE);
753 static void pch_disable_backlight(struct intel_connector *connector)
755 struct drm_device *dev = connector->base.dev;
756 struct drm_i915_private *dev_priv = dev->dev_private;
759 intel_panel_actually_set_backlight(connector, 0);
761 tmp = I915_READ(BLC_PWM_CPU_CTL2);
762 I915_WRITE(BLC_PWM_CPU_CTL2, tmp & ~BLM_PWM_ENABLE);
764 tmp = I915_READ(BLC_PWM_PCH_CTL1);
765 I915_WRITE(BLC_PWM_PCH_CTL1, tmp & ~BLM_PCH_PWM_ENABLE);
768 static void i9xx_disable_backlight(struct intel_connector *connector)
770 intel_panel_actually_set_backlight(connector, 0);
773 static void i965_disable_backlight(struct intel_connector *connector)
775 struct drm_device *dev = connector->base.dev;
776 struct drm_i915_private *dev_priv = dev->dev_private;
779 intel_panel_actually_set_backlight(connector, 0);
781 tmp = I915_READ(BLC_PWM_CTL2);
782 I915_WRITE(BLC_PWM_CTL2, tmp & ~BLM_PWM_ENABLE);
785 static void vlv_disable_backlight(struct intel_connector *connector)
787 struct drm_device *dev = connector->base.dev;
788 struct drm_i915_private *dev_priv = dev->dev_private;
789 enum pipe pipe = intel_get_pipe_from_connector(connector);
792 if (WARN_ON(pipe != PIPE_A && pipe != PIPE_B))
795 intel_panel_actually_set_backlight(connector, 0);
797 tmp = I915_READ(VLV_BLC_PWM_CTL2(pipe));
798 I915_WRITE(VLV_BLC_PWM_CTL2(pipe), tmp & ~BLM_PWM_ENABLE);
801 static void bxt_disable_backlight(struct intel_connector *connector)
803 struct drm_device *dev = connector->base.dev;
804 struct drm_i915_private *dev_priv = dev->dev_private;
805 struct intel_panel *panel = &connector->panel;
808 intel_panel_actually_set_backlight(connector, 0);
810 tmp = I915_READ(BXT_BLC_PWM_CTL(panel->backlight.controller));
811 I915_WRITE(BXT_BLC_PWM_CTL(panel->backlight.controller),
812 tmp & ~BXT_BLC_PWM_ENABLE);
814 if (panel->backlight.controller == 1) {
815 val = I915_READ(UTIL_PIN_CTL);
816 val &= ~UTIL_PIN_ENABLE;
817 I915_WRITE(UTIL_PIN_CTL, val);
821 static void pwm_disable_backlight(struct intel_connector *connector)
823 struct intel_panel *panel = &connector->panel;
825 /* Disable the backlight */
826 pwm_config(panel->backlight.pwm, 0, CRC_PMIC_PWM_PERIOD_NS);
827 usleep_range(2000, 3000);
828 pwm_disable(panel->backlight.pwm);
831 void intel_panel_disable_backlight(struct intel_connector *connector)
833 struct drm_device *dev = connector->base.dev;
834 struct drm_i915_private *dev_priv = dev->dev_private;
835 struct intel_panel *panel = &connector->panel;
837 if (!panel->backlight.present)
841 * Do not disable backlight on the vga_switcheroo path. When switching
842 * away from i915, the other client may depend on i915 to handle the
843 * backlight. This will leave the backlight on unnecessarily when
844 * another client is not activated.
846 if (dev->switch_power_state == DRM_SWITCH_POWER_CHANGING) {
847 DRM_DEBUG_DRIVER("Skipping backlight disable on vga switch\n");
851 mutex_lock(&dev_priv->backlight_lock);
853 if (panel->backlight.device)
854 panel->backlight.device->props.power = FB_BLANK_POWERDOWN;
855 panel->backlight.enabled = false;
856 panel->backlight.disable(connector);
858 mutex_unlock(&dev_priv->backlight_lock);
861 static void lpt_enable_backlight(struct intel_connector *connector)
863 struct drm_device *dev = connector->base.dev;
864 struct drm_i915_private *dev_priv = dev->dev_private;
865 struct intel_panel *panel = &connector->panel;
866 u32 pch_ctl1, pch_ctl2;
868 pch_ctl1 = I915_READ(BLC_PWM_PCH_CTL1);
869 if (pch_ctl1 & BLM_PCH_PWM_ENABLE) {
870 DRM_DEBUG_KMS("pch backlight already enabled\n");
871 pch_ctl1 &= ~BLM_PCH_PWM_ENABLE;
872 I915_WRITE(BLC_PWM_PCH_CTL1, pch_ctl1);
875 pch_ctl2 = panel->backlight.max << 16;
876 I915_WRITE(BLC_PWM_PCH_CTL2, pch_ctl2);
879 if (panel->backlight.active_low_pwm)
880 pch_ctl1 |= BLM_PCH_POLARITY;
882 /* After LPT, override is the default. */
883 if (HAS_PCH_LPT(dev_priv))
884 pch_ctl1 |= BLM_PCH_OVERRIDE_ENABLE;
886 I915_WRITE(BLC_PWM_PCH_CTL1, pch_ctl1);
887 POSTING_READ(BLC_PWM_PCH_CTL1);
888 I915_WRITE(BLC_PWM_PCH_CTL1, pch_ctl1 | BLM_PCH_PWM_ENABLE);
890 /* This won't stick until the above enable. */
891 intel_panel_actually_set_backlight(connector, panel->backlight.level);
894 static void pch_enable_backlight(struct intel_connector *connector)
896 struct drm_device *dev = connector->base.dev;
897 struct drm_i915_private *dev_priv = dev->dev_private;
898 struct intel_panel *panel = &connector->panel;
899 enum pipe pipe = intel_get_pipe_from_connector(connector);
900 enum transcoder cpu_transcoder =
901 intel_pipe_to_cpu_transcoder(dev_priv, pipe);
902 u32 cpu_ctl2, pch_ctl1, pch_ctl2;
904 cpu_ctl2 = I915_READ(BLC_PWM_CPU_CTL2);
905 if (cpu_ctl2 & BLM_PWM_ENABLE) {
906 DRM_DEBUG_KMS("cpu backlight already enabled\n");
907 cpu_ctl2 &= ~BLM_PWM_ENABLE;
908 I915_WRITE(BLC_PWM_CPU_CTL2, cpu_ctl2);
911 pch_ctl1 = I915_READ(BLC_PWM_PCH_CTL1);
912 if (pch_ctl1 & BLM_PCH_PWM_ENABLE) {
913 DRM_DEBUG_KMS("pch backlight already enabled\n");
914 pch_ctl1 &= ~BLM_PCH_PWM_ENABLE;
915 I915_WRITE(BLC_PWM_PCH_CTL1, pch_ctl1);
918 if (cpu_transcoder == TRANSCODER_EDP)
919 cpu_ctl2 = BLM_TRANSCODER_EDP;
921 cpu_ctl2 = BLM_PIPE(cpu_transcoder);
922 I915_WRITE(BLC_PWM_CPU_CTL2, cpu_ctl2);
923 POSTING_READ(BLC_PWM_CPU_CTL2);
924 I915_WRITE(BLC_PWM_CPU_CTL2, cpu_ctl2 | BLM_PWM_ENABLE);
926 /* This won't stick until the above enable. */
927 intel_panel_actually_set_backlight(connector, panel->backlight.level);
929 pch_ctl2 = panel->backlight.max << 16;
930 I915_WRITE(BLC_PWM_PCH_CTL2, pch_ctl2);
933 if (panel->backlight.active_low_pwm)
934 pch_ctl1 |= BLM_PCH_POLARITY;
936 I915_WRITE(BLC_PWM_PCH_CTL1, pch_ctl1);
937 POSTING_READ(BLC_PWM_PCH_CTL1);
938 I915_WRITE(BLC_PWM_PCH_CTL1, pch_ctl1 | BLM_PCH_PWM_ENABLE);
941 static void i9xx_enable_backlight(struct intel_connector *connector)
943 struct drm_device *dev = connector->base.dev;
944 struct drm_i915_private *dev_priv = dev->dev_private;
945 struct intel_panel *panel = &connector->panel;
948 ctl = I915_READ(BLC_PWM_CTL);
949 if (ctl & BACKLIGHT_DUTY_CYCLE_MASK_PNV) {
950 DRM_DEBUG_KMS("backlight already enabled\n");
951 I915_WRITE(BLC_PWM_CTL, 0);
954 freq = panel->backlight.max;
955 if (panel->backlight.combination_mode)
959 if (panel->backlight.combination_mode)
960 ctl |= BLM_LEGACY_MODE;
961 if (IS_PINEVIEW(dev) && panel->backlight.active_low_pwm)
962 ctl |= BLM_POLARITY_PNV;
964 I915_WRITE(BLC_PWM_CTL, ctl);
965 POSTING_READ(BLC_PWM_CTL);
967 /* XXX: combine this into above write? */
968 intel_panel_actually_set_backlight(connector, panel->backlight.level);
971 * Needed to enable backlight on some 855gm models. BLC_HIST_CTL is
972 * 855gm only, but checking for gen2 is safe, as 855gm is the only gen2
973 * that has backlight.
976 I915_WRITE(BLC_HIST_CTL, BLM_HISTOGRAM_ENABLE);
979 static void i965_enable_backlight(struct intel_connector *connector)
981 struct drm_device *dev = connector->base.dev;
982 struct drm_i915_private *dev_priv = dev->dev_private;
983 struct intel_panel *panel = &connector->panel;
984 enum pipe pipe = intel_get_pipe_from_connector(connector);
987 ctl2 = I915_READ(BLC_PWM_CTL2);
988 if (ctl2 & BLM_PWM_ENABLE) {
989 DRM_DEBUG_KMS("backlight already enabled\n");
990 ctl2 &= ~BLM_PWM_ENABLE;
991 I915_WRITE(BLC_PWM_CTL2, ctl2);
994 freq = panel->backlight.max;
995 if (panel->backlight.combination_mode)
999 I915_WRITE(BLC_PWM_CTL, ctl);
1001 ctl2 = BLM_PIPE(pipe);
1002 if (panel->backlight.combination_mode)
1003 ctl2 |= BLM_COMBINATION_MODE;
1004 if (panel->backlight.active_low_pwm)
1005 ctl2 |= BLM_POLARITY_I965;
1006 I915_WRITE(BLC_PWM_CTL2, ctl2);
1007 POSTING_READ(BLC_PWM_CTL2);
1008 I915_WRITE(BLC_PWM_CTL2, ctl2 | BLM_PWM_ENABLE);
1010 intel_panel_actually_set_backlight(connector, panel->backlight.level);
1013 static void vlv_enable_backlight(struct intel_connector *connector)
1015 struct drm_device *dev = connector->base.dev;
1016 struct drm_i915_private *dev_priv = dev->dev_private;
1017 struct intel_panel *panel = &connector->panel;
1018 enum pipe pipe = intel_get_pipe_from_connector(connector);
1021 if (WARN_ON(pipe != PIPE_A && pipe != PIPE_B))
1024 ctl2 = I915_READ(VLV_BLC_PWM_CTL2(pipe));
1025 if (ctl2 & BLM_PWM_ENABLE) {
1026 DRM_DEBUG_KMS("backlight already enabled\n");
1027 ctl2 &= ~BLM_PWM_ENABLE;
1028 I915_WRITE(VLV_BLC_PWM_CTL2(pipe), ctl2);
1031 ctl = panel->backlight.max << 16;
1032 I915_WRITE(VLV_BLC_PWM_CTL(pipe), ctl);
1034 /* XXX: combine this into above write? */
1035 intel_panel_actually_set_backlight(connector, panel->backlight.level);
1038 if (panel->backlight.active_low_pwm)
1039 ctl2 |= BLM_POLARITY_I965;
1040 I915_WRITE(VLV_BLC_PWM_CTL2(pipe), ctl2);
1041 POSTING_READ(VLV_BLC_PWM_CTL2(pipe));
1042 I915_WRITE(VLV_BLC_PWM_CTL2(pipe), ctl2 | BLM_PWM_ENABLE);
1045 static void bxt_enable_backlight(struct intel_connector *connector)
1047 struct drm_device *dev = connector->base.dev;
1048 struct drm_i915_private *dev_priv = dev->dev_private;
1049 struct intel_panel *panel = &connector->panel;
1050 enum pipe pipe = intel_get_pipe_from_connector(connector);
1053 /* To use 2nd set of backlight registers, utility pin has to be
1054 * enabled with PWM mode.
1055 * The field should only be changed when the utility pin is disabled
1057 if (panel->backlight.controller == 1) {
1058 val = I915_READ(UTIL_PIN_CTL);
1059 if (val & UTIL_PIN_ENABLE) {
1060 DRM_DEBUG_KMS("util pin already enabled\n");
1061 val &= ~UTIL_PIN_ENABLE;
1062 I915_WRITE(UTIL_PIN_CTL, val);
1066 if (panel->backlight.util_pin_active_low)
1067 val |= UTIL_PIN_POLARITY;
1068 I915_WRITE(UTIL_PIN_CTL, val | UTIL_PIN_PIPE(pipe) |
1069 UTIL_PIN_MODE_PWM | UTIL_PIN_ENABLE);
1072 pwm_ctl = I915_READ(BXT_BLC_PWM_CTL(panel->backlight.controller));
1073 if (pwm_ctl & BXT_BLC_PWM_ENABLE) {
1074 DRM_DEBUG_KMS("backlight already enabled\n");
1075 pwm_ctl &= ~BXT_BLC_PWM_ENABLE;
1076 I915_WRITE(BXT_BLC_PWM_CTL(panel->backlight.controller),
1080 I915_WRITE(BXT_BLC_PWM_FREQ(panel->backlight.controller),
1081 panel->backlight.max);
1083 intel_panel_actually_set_backlight(connector, panel->backlight.level);
1086 if (panel->backlight.active_low_pwm)
1087 pwm_ctl |= BXT_BLC_PWM_POLARITY;
1089 I915_WRITE(BXT_BLC_PWM_CTL(panel->backlight.controller), pwm_ctl);
1090 POSTING_READ(BXT_BLC_PWM_CTL(panel->backlight.controller));
1091 I915_WRITE(BXT_BLC_PWM_CTL(panel->backlight.controller),
1092 pwm_ctl | BXT_BLC_PWM_ENABLE);
1095 static void pwm_enable_backlight(struct intel_connector *connector)
1097 struct intel_panel *panel = &connector->panel;
1099 pwm_enable(panel->backlight.pwm);
1100 intel_panel_actually_set_backlight(connector, panel->backlight.level);
1103 void intel_panel_enable_backlight(struct intel_connector *connector)
1105 struct drm_device *dev = connector->base.dev;
1106 struct drm_i915_private *dev_priv = dev->dev_private;
1107 struct intel_panel *panel = &connector->panel;
1108 enum pipe pipe = intel_get_pipe_from_connector(connector);
1110 if (!panel->backlight.present)
1113 DRM_DEBUG_KMS("pipe %c\n", pipe_name(pipe));
1115 mutex_lock(&dev_priv->backlight_lock);
1117 WARN_ON(panel->backlight.max == 0);
1119 if (panel->backlight.level <= panel->backlight.min) {
1120 panel->backlight.level = panel->backlight.max;
1121 if (panel->backlight.device)
1122 panel->backlight.device->props.brightness =
1123 scale_hw_to_user(connector,
1124 panel->backlight.level,
1125 panel->backlight.device->props.max_brightness);
1128 panel->backlight.enable(connector);
1129 panel->backlight.enabled = true;
1130 if (panel->backlight.device)
1131 panel->backlight.device->props.power = FB_BLANK_UNBLANK;
1133 mutex_unlock(&dev_priv->backlight_lock);
1136 #if IS_ENABLED(CONFIG_BACKLIGHT_CLASS_DEVICE)
1137 static int intel_backlight_device_update_status(struct backlight_device *bd)
1139 struct intel_connector *connector = bl_get_data(bd);
1140 struct intel_panel *panel = &connector->panel;
1141 struct drm_device *dev = connector->base.dev;
1143 drm_modeset_lock(&dev->mode_config.connection_mutex, NULL);
1144 DRM_DEBUG_KMS("updating intel_backlight, brightness=%d/%d\n",
1145 bd->props.brightness, bd->props.max_brightness);
1146 intel_panel_set_backlight(connector, bd->props.brightness,
1147 bd->props.max_brightness);
1150 * Allow flipping bl_power as a sub-state of enabled. Sadly the
1151 * backlight class device does not make it easy to to differentiate
1152 * between callbacks for brightness and bl_power, so our backlight_power
1153 * callback needs to take this into account.
1155 if (panel->backlight.enabled) {
1156 if (panel->backlight.power) {
1157 bool enable = bd->props.power == FB_BLANK_UNBLANK &&
1158 bd->props.brightness != 0;
1159 panel->backlight.power(connector, enable);
1162 bd->props.power = FB_BLANK_POWERDOWN;
1165 drm_modeset_unlock(&dev->mode_config.connection_mutex);
1169 static int intel_backlight_device_get_brightness(struct backlight_device *bd)
1171 struct intel_connector *connector = bl_get_data(bd);
1172 struct drm_device *dev = connector->base.dev;
1173 struct drm_i915_private *dev_priv = dev->dev_private;
1177 intel_runtime_pm_get(dev_priv);
1178 drm_modeset_lock(&dev->mode_config.connection_mutex, NULL);
1180 hw_level = intel_panel_get_backlight(connector);
1181 ret = scale_hw_to_user(connector, hw_level, bd->props.max_brightness);
1183 drm_modeset_unlock(&dev->mode_config.connection_mutex);
1184 intel_runtime_pm_put(dev_priv);
1189 static const struct backlight_ops intel_backlight_device_ops = {
1190 .update_status = intel_backlight_device_update_status,
1191 .get_brightness = intel_backlight_device_get_brightness,
1194 static int intel_backlight_device_register(struct intel_connector *connector)
1196 struct intel_panel *panel = &connector->panel;
1197 struct backlight_properties props;
1199 if (WARN_ON(panel->backlight.device))
1202 if (!panel->backlight.present)
1205 WARN_ON(panel->backlight.max == 0);
1207 memset(&props, 0, sizeof(props));
1208 props.type = BACKLIGHT_RAW;
1211 * Note: Everything should work even if the backlight device max
1212 * presented to the userspace is arbitrarily chosen.
1214 props.max_brightness = panel->backlight.max;
1215 props.brightness = scale_hw_to_user(connector,
1216 panel->backlight.level,
1217 props.max_brightness);
1219 if (panel->backlight.enabled)
1220 props.power = FB_BLANK_UNBLANK;
1222 props.power = FB_BLANK_POWERDOWN;
1225 * Note: using the same name independent of the connector prevents
1226 * registration of multiple backlight devices in the driver.
1228 panel->backlight.device =
1229 backlight_device_register("intel_backlight",
1230 connector->base.kdev,
1232 &intel_backlight_device_ops, &props);
1234 if (IS_ERR(panel->backlight.device)) {
1235 DRM_ERROR("Failed to register backlight: %ld\n",
1236 PTR_ERR(panel->backlight.device));
1237 panel->backlight.device = NULL;
1241 DRM_DEBUG_KMS("Connector %s backlight sysfs interface registered\n",
1242 connector->base.name);
1247 static void intel_backlight_device_unregister(struct intel_connector *connector)
1249 struct intel_panel *panel = &connector->panel;
1251 if (panel->backlight.device) {
1252 backlight_device_unregister(panel->backlight.device);
1253 panel->backlight.device = NULL;
1256 #else /* CONFIG_BACKLIGHT_CLASS_DEVICE */
1257 static int intel_backlight_device_register(struct intel_connector *connector)
1261 static void intel_backlight_device_unregister(struct intel_connector *connector)
1264 #endif /* CONFIG_BACKLIGHT_CLASS_DEVICE */
1267 * SPT: This value represents the period of the PWM stream in clock periods
1268 * multiplied by 16 (default increment) or 128 (alternate increment selected in
1269 * SCHICKEN_1 bit 0). PWM clock is 24 MHz.
1271 static u32 spt_hz_to_pwm(struct intel_connector *connector, u32 pwm_freq_hz)
1273 struct drm_device *dev = connector->base.dev;
1274 struct drm_i915_private *dev_priv = dev->dev_private;
1277 if (I915_READ(SOUTH_CHICKEN1) & SPT_PWM_GRANULARITY)
1284 return clock / (pwm_freq_hz * mul);
1288 * LPT: This value represents the period of the PWM stream in clock periods
1289 * multiplied by 128 (default increment) or 16 (alternate increment, selected in
1290 * LPT SOUTH_CHICKEN2 register bit 5).
1292 static u32 lpt_hz_to_pwm(struct intel_connector *connector, u32 pwm_freq_hz)
1294 struct drm_device *dev = connector->base.dev;
1295 struct drm_i915_private *dev_priv = dev->dev_private;
1298 if (I915_READ(SOUTH_CHICKEN2) & LPT_PWM_GRANULARITY)
1303 if (dev_priv->pch_id == INTEL_PCH_LPT_DEVICE_ID_TYPE)
1304 clock = MHz(135); /* LPT:H */
1306 clock = MHz(24); /* LPT:LP */
1308 return clock / (pwm_freq_hz * mul);
1312 * ILK/SNB/IVB: This value represents the period of the PWM stream in PCH
1313 * display raw clocks multiplied by 128.
1315 static u32 pch_hz_to_pwm(struct intel_connector *connector, u32 pwm_freq_hz)
1317 struct drm_device *dev = connector->base.dev;
1318 int clock = MHz(intel_pch_rawclk(dev));
1320 return clock / (pwm_freq_hz * 128);
1324 * Gen2: This field determines the number of time base events (display core
1325 * clock frequency/32) in total for a complete cycle of modulated backlight
1328 * Gen3: A time base event equals the display core clock ([DevPNV] HRAW clock)
1331 static u32 i9xx_hz_to_pwm(struct intel_connector *connector, u32 pwm_freq_hz)
1333 struct drm_device *dev = connector->base.dev;
1334 struct drm_i915_private *dev_priv = dev->dev_private;
1337 if (IS_PINEVIEW(dev))
1338 clock = intel_hrawclk(dev);
1340 clock = 1000 * dev_priv->display.get_display_clock_speed(dev);
1342 return clock / (pwm_freq_hz * 32);
1346 * Gen4: This value represents the period of the PWM stream in display core
1347 * clocks multiplied by 128.
1349 static u32 i965_hz_to_pwm(struct intel_connector *connector, u32 pwm_freq_hz)
1351 struct drm_device *dev = connector->base.dev;
1352 struct drm_i915_private *dev_priv = dev->dev_private;
1353 int clock = 1000 * dev_priv->display.get_display_clock_speed(dev);
1355 return clock / (pwm_freq_hz * 128);
1359 * VLV: This value represents the period of the PWM stream in display core
1360 * clocks ([DevCTG] 200MHz HRAW clocks) multiplied by 128 or 25MHz S0IX clocks
1361 * multiplied by 16. CHV uses a 19.2MHz S0IX clock.
1363 static u32 vlv_hz_to_pwm(struct intel_connector *connector, u32 pwm_freq_hz)
1365 struct drm_device *dev = connector->base.dev;
1366 struct drm_i915_private *dev_priv = dev->dev_private;
1369 if ((I915_READ(CBR1_VLV) & CBR_PWM_CLOCK_MUX_SELECT) == 0) {
1370 if (IS_CHERRYVIEW(dev))
1371 return KHz(19200) / (pwm_freq_hz * 16);
1373 return MHz(25) / (pwm_freq_hz * 16);
1375 clock = intel_hrawclk(dev);
1376 return MHz(clock) / (pwm_freq_hz * 128);
1380 static u32 get_backlight_max_vbt(struct intel_connector *connector)
1382 struct drm_device *dev = connector->base.dev;
1383 struct drm_i915_private *dev_priv = dev->dev_private;
1384 struct intel_panel *panel = &connector->panel;
1385 u16 pwm_freq_hz = dev_priv->vbt.backlight.pwm_freq_hz;
1389 DRM_DEBUG_KMS("backlight frequency not specified in VBT\n");
1393 if (!panel->backlight.hz_to_pwm) {
1394 DRM_DEBUG_KMS("backlight frequency setting from VBT currently not supported on this platform\n");
1398 pwm = panel->backlight.hz_to_pwm(connector, pwm_freq_hz);
1400 DRM_DEBUG_KMS("backlight frequency conversion failed\n");
1404 DRM_DEBUG_KMS("backlight frequency %u Hz from VBT\n", pwm_freq_hz);
1410 * Note: The setup hooks can't assume pipe is set!
1412 static u32 get_backlight_min_vbt(struct intel_connector *connector)
1414 struct drm_device *dev = connector->base.dev;
1415 struct drm_i915_private *dev_priv = dev->dev_private;
1416 struct intel_panel *panel = &connector->panel;
1419 WARN_ON(panel->backlight.max == 0);
1422 * XXX: If the vbt value is 255, it makes min equal to max, which leads
1423 * to problems. There are such machines out there. Either our
1424 * interpretation is wrong or the vbt has bogus data. Or both. Safeguard
1425 * against this by letting the minimum be at most (arbitrarily chosen)
1428 min = clamp_t(int, dev_priv->vbt.backlight.min_brightness, 0, 64);
1429 if (min != dev_priv->vbt.backlight.min_brightness) {
1430 DRM_DEBUG_KMS("clamping VBT min backlight %d/255 to %d/255\n",
1431 dev_priv->vbt.backlight.min_brightness, min);
1434 /* vbt value is a coefficient in range [0..255] */
1435 return scale(min, 0, 255, 0, panel->backlight.max);
1438 static int lpt_setup_backlight(struct intel_connector *connector, enum pipe unused)
1440 struct drm_device *dev = connector->base.dev;
1441 struct drm_i915_private *dev_priv = dev->dev_private;
1442 struct intel_panel *panel = &connector->panel;
1443 u32 pch_ctl1, pch_ctl2, val;
1445 pch_ctl1 = I915_READ(BLC_PWM_PCH_CTL1);
1446 panel->backlight.active_low_pwm = pch_ctl1 & BLM_PCH_POLARITY;
1448 pch_ctl2 = I915_READ(BLC_PWM_PCH_CTL2);
1449 panel->backlight.max = pch_ctl2 >> 16;
1451 if (!panel->backlight.max)
1452 panel->backlight.max = get_backlight_max_vbt(connector);
1454 if (!panel->backlight.max)
1457 panel->backlight.min = get_backlight_min_vbt(connector);
1459 val = lpt_get_backlight(connector);
1460 panel->backlight.level = intel_panel_compute_brightness(connector, val);
1462 panel->backlight.enabled = (pch_ctl1 & BLM_PCH_PWM_ENABLE) &&
1463 panel->backlight.level != 0;
1468 static int pch_setup_backlight(struct intel_connector *connector, enum pipe unused)
1470 struct drm_device *dev = connector->base.dev;
1471 struct drm_i915_private *dev_priv = dev->dev_private;
1472 struct intel_panel *panel = &connector->panel;
1473 u32 cpu_ctl2, pch_ctl1, pch_ctl2, val;
1475 pch_ctl1 = I915_READ(BLC_PWM_PCH_CTL1);
1476 panel->backlight.active_low_pwm = pch_ctl1 & BLM_PCH_POLARITY;
1478 pch_ctl2 = I915_READ(BLC_PWM_PCH_CTL2);
1479 panel->backlight.max = pch_ctl2 >> 16;
1481 if (!panel->backlight.max)
1482 panel->backlight.max = get_backlight_max_vbt(connector);
1484 if (!panel->backlight.max)
1487 panel->backlight.min = get_backlight_min_vbt(connector);
1489 val = pch_get_backlight(connector);
1490 panel->backlight.level = intel_panel_compute_brightness(connector, val);
1492 cpu_ctl2 = I915_READ(BLC_PWM_CPU_CTL2);
1493 panel->backlight.enabled = (cpu_ctl2 & BLM_PWM_ENABLE) &&
1494 (pch_ctl1 & BLM_PCH_PWM_ENABLE) && panel->backlight.level != 0;
1499 static int i9xx_setup_backlight(struct intel_connector *connector, enum pipe unused)
1501 struct drm_device *dev = connector->base.dev;
1502 struct drm_i915_private *dev_priv = dev->dev_private;
1503 struct intel_panel *panel = &connector->panel;
1506 ctl = I915_READ(BLC_PWM_CTL);
1508 if (IS_GEN2(dev) || IS_I915GM(dev) || IS_I945GM(dev))
1509 panel->backlight.combination_mode = ctl & BLM_LEGACY_MODE;
1511 if (IS_PINEVIEW(dev))
1512 panel->backlight.active_low_pwm = ctl & BLM_POLARITY_PNV;
1514 panel->backlight.max = ctl >> 17;
1516 if (!panel->backlight.max) {
1517 panel->backlight.max = get_backlight_max_vbt(connector);
1518 panel->backlight.max >>= 1;
1521 if (!panel->backlight.max)
1524 if (panel->backlight.combination_mode)
1525 panel->backlight.max *= 0xff;
1527 panel->backlight.min = get_backlight_min_vbt(connector);
1529 val = i9xx_get_backlight(connector);
1530 panel->backlight.level = intel_panel_compute_brightness(connector, val);
1532 panel->backlight.enabled = panel->backlight.level != 0;
1537 static int i965_setup_backlight(struct intel_connector *connector, enum pipe unused)
1539 struct drm_device *dev = connector->base.dev;
1540 struct drm_i915_private *dev_priv = dev->dev_private;
1541 struct intel_panel *panel = &connector->panel;
1544 ctl2 = I915_READ(BLC_PWM_CTL2);
1545 panel->backlight.combination_mode = ctl2 & BLM_COMBINATION_MODE;
1546 panel->backlight.active_low_pwm = ctl2 & BLM_POLARITY_I965;
1548 ctl = I915_READ(BLC_PWM_CTL);
1549 panel->backlight.max = ctl >> 16;
1551 if (!panel->backlight.max)
1552 panel->backlight.max = get_backlight_max_vbt(connector);
1554 if (!panel->backlight.max)
1557 if (panel->backlight.combination_mode)
1558 panel->backlight.max *= 0xff;
1560 panel->backlight.min = get_backlight_min_vbt(connector);
1562 val = i9xx_get_backlight(connector);
1563 panel->backlight.level = intel_panel_compute_brightness(connector, val);
1565 panel->backlight.enabled = (ctl2 & BLM_PWM_ENABLE) &&
1566 panel->backlight.level != 0;
1571 static int vlv_setup_backlight(struct intel_connector *connector, enum pipe pipe)
1573 struct drm_device *dev = connector->base.dev;
1574 struct drm_i915_private *dev_priv = dev->dev_private;
1575 struct intel_panel *panel = &connector->panel;
1578 if (WARN_ON(pipe != PIPE_A && pipe != PIPE_B))
1581 ctl2 = I915_READ(VLV_BLC_PWM_CTL2(pipe));
1582 panel->backlight.active_low_pwm = ctl2 & BLM_POLARITY_I965;
1584 ctl = I915_READ(VLV_BLC_PWM_CTL(pipe));
1585 panel->backlight.max = ctl >> 16;
1587 if (!panel->backlight.max)
1588 panel->backlight.max = get_backlight_max_vbt(connector);
1590 if (!panel->backlight.max)
1593 panel->backlight.min = get_backlight_min_vbt(connector);
1595 val = _vlv_get_backlight(dev, pipe);
1596 panel->backlight.level = intel_panel_compute_brightness(connector, val);
1598 panel->backlight.enabled = (ctl2 & BLM_PWM_ENABLE) &&
1599 panel->backlight.level != 0;
1605 bxt_setup_backlight(struct intel_connector *connector, enum pipe unused)
1607 struct drm_device *dev = connector->base.dev;
1608 struct drm_i915_private *dev_priv = dev->dev_private;
1609 struct intel_panel *panel = &connector->panel;
1613 * For BXT hard coding the Backlight controller to 0.
1614 * TODO : Read the controller value from VBT and generalize
1616 panel->backlight.controller = 0;
1618 pwm_ctl = I915_READ(BXT_BLC_PWM_CTL(panel->backlight.controller));
1620 /* Keeping the check if controller 1 is to be programmed.
1621 * This will come into affect once the VBT parsing
1622 * is fixed for controller selection, and controller 1 is used
1623 * for a prticular display configuration.
1625 if (panel->backlight.controller == 1) {
1626 val = I915_READ(UTIL_PIN_CTL);
1627 panel->backlight.util_pin_active_low =
1628 val & UTIL_PIN_POLARITY;
1631 panel->backlight.active_low_pwm = pwm_ctl & BXT_BLC_PWM_POLARITY;
1632 panel->backlight.max =
1633 I915_READ(BXT_BLC_PWM_FREQ(panel->backlight.controller));
1635 if (!panel->backlight.max)
1636 panel->backlight.max = get_backlight_max_vbt(connector);
1638 if (!panel->backlight.max)
1641 val = bxt_get_backlight(connector);
1642 panel->backlight.level = intel_panel_compute_brightness(connector, val);
1644 panel->backlight.enabled = (pwm_ctl & BXT_BLC_PWM_ENABLE) &&
1645 panel->backlight.level != 0;
1650 static int pwm_setup_backlight(struct intel_connector *connector,
1653 struct drm_device *dev = connector->base.dev;
1654 struct intel_panel *panel = &connector->panel;
1657 /* Get the PWM chip for backlight control */
1658 panel->backlight.pwm = pwm_get(dev->dev, "pwm_backlight");
1659 if (IS_ERR(panel->backlight.pwm)) {
1660 DRM_ERROR("Failed to own the pwm chip\n");
1661 panel->backlight.pwm = NULL;
1665 retval = pwm_config(panel->backlight.pwm, CRC_PMIC_PWM_PERIOD_NS,
1666 CRC_PMIC_PWM_PERIOD_NS);
1668 DRM_ERROR("Failed to configure the pwm chip\n");
1669 pwm_put(panel->backlight.pwm);
1670 panel->backlight.pwm = NULL;
1674 panel->backlight.min = 0; /* 0% */
1675 panel->backlight.max = 100; /* 100% */
1676 panel->backlight.level = DIV_ROUND_UP(
1677 pwm_get_duty_cycle(panel->backlight.pwm) * 100,
1678 CRC_PMIC_PWM_PERIOD_NS);
1679 panel->backlight.enabled = panel->backlight.level != 0;
1684 int intel_panel_setup_backlight(struct drm_connector *connector, enum pipe pipe)
1686 struct drm_device *dev = connector->dev;
1687 struct drm_i915_private *dev_priv = dev->dev_private;
1688 struct intel_connector *intel_connector = to_intel_connector(connector);
1689 struct intel_panel *panel = &intel_connector->panel;
1692 if (!dev_priv->vbt.backlight.present) {
1693 if (dev_priv->quirks & QUIRK_BACKLIGHT_PRESENT) {
1694 DRM_DEBUG_KMS("no backlight present per VBT, but present per quirk\n");
1696 DRM_DEBUG_KMS("no backlight present per VBT\n");
1701 /* ensure intel_panel has been initialized first */
1702 if (WARN_ON(!panel->backlight.setup))
1705 /* set level and max in panel struct */
1706 mutex_lock(&dev_priv->backlight_lock);
1707 ret = panel->backlight.setup(intel_connector, pipe);
1708 mutex_unlock(&dev_priv->backlight_lock);
1711 DRM_DEBUG_KMS("failed to setup backlight for connector %s\n",
1716 panel->backlight.present = true;
1718 DRM_DEBUG_KMS("Connector %s backlight initialized, %s, brightness %u/%u\n",
1720 panel->backlight.enabled ? "enabled" : "disabled",
1721 panel->backlight.level, panel->backlight.max);
1726 void intel_panel_destroy_backlight(struct drm_connector *connector)
1728 struct intel_connector *intel_connector = to_intel_connector(connector);
1729 struct intel_panel *panel = &intel_connector->panel;
1731 /* dispose of the pwm */
1732 if (panel->backlight.pwm)
1733 pwm_put(panel->backlight.pwm);
1735 panel->backlight.present = false;
1738 /* Set up chip specific backlight functions */
1740 intel_panel_init_backlight_funcs(struct intel_panel *panel)
1742 struct intel_connector *intel_connector =
1743 container_of(panel, struct intel_connector, panel);
1744 struct drm_device *dev = intel_connector->base.dev;
1745 struct drm_i915_private *dev_priv = dev->dev_private;
1747 if (IS_BROXTON(dev)) {
1748 panel->backlight.setup = bxt_setup_backlight;
1749 panel->backlight.enable = bxt_enable_backlight;
1750 panel->backlight.disable = bxt_disable_backlight;
1751 panel->backlight.set = bxt_set_backlight;
1752 panel->backlight.get = bxt_get_backlight;
1753 } else if (HAS_PCH_LPT(dev) || HAS_PCH_SPT(dev)) {
1754 panel->backlight.setup = lpt_setup_backlight;
1755 panel->backlight.enable = lpt_enable_backlight;
1756 panel->backlight.disable = lpt_disable_backlight;
1757 panel->backlight.set = lpt_set_backlight;
1758 panel->backlight.get = lpt_get_backlight;
1759 if (HAS_PCH_LPT(dev))
1760 panel->backlight.hz_to_pwm = lpt_hz_to_pwm;
1762 panel->backlight.hz_to_pwm = spt_hz_to_pwm;
1763 } else if (HAS_PCH_SPLIT(dev)) {
1764 panel->backlight.setup = pch_setup_backlight;
1765 panel->backlight.enable = pch_enable_backlight;
1766 panel->backlight.disable = pch_disable_backlight;
1767 panel->backlight.set = pch_set_backlight;
1768 panel->backlight.get = pch_get_backlight;
1769 panel->backlight.hz_to_pwm = pch_hz_to_pwm;
1770 } else if (IS_VALLEYVIEW(dev)) {
1771 if (dev_priv->vbt.has_mipi) {
1772 panel->backlight.setup = pwm_setup_backlight;
1773 panel->backlight.enable = pwm_enable_backlight;
1774 panel->backlight.disable = pwm_disable_backlight;
1775 panel->backlight.set = pwm_set_backlight;
1776 panel->backlight.get = pwm_get_backlight;
1778 panel->backlight.setup = vlv_setup_backlight;
1779 panel->backlight.enable = vlv_enable_backlight;
1780 panel->backlight.disable = vlv_disable_backlight;
1781 panel->backlight.set = vlv_set_backlight;
1782 panel->backlight.get = vlv_get_backlight;
1783 panel->backlight.hz_to_pwm = vlv_hz_to_pwm;
1785 } else if (IS_GEN4(dev)) {
1786 panel->backlight.setup = i965_setup_backlight;
1787 panel->backlight.enable = i965_enable_backlight;
1788 panel->backlight.disable = i965_disable_backlight;
1789 panel->backlight.set = i9xx_set_backlight;
1790 panel->backlight.get = i9xx_get_backlight;
1791 panel->backlight.hz_to_pwm = i965_hz_to_pwm;
1793 panel->backlight.setup = i9xx_setup_backlight;
1794 panel->backlight.enable = i9xx_enable_backlight;
1795 panel->backlight.disable = i9xx_disable_backlight;
1796 panel->backlight.set = i9xx_set_backlight;
1797 panel->backlight.get = i9xx_get_backlight;
1798 panel->backlight.hz_to_pwm = i9xx_hz_to_pwm;
1802 int intel_panel_init(struct intel_panel *panel,
1803 struct drm_display_mode *fixed_mode,
1804 struct drm_display_mode *downclock_mode)
1806 intel_panel_init_backlight_funcs(panel);
1808 panel->fixed_mode = fixed_mode;
1809 panel->downclock_mode = downclock_mode;
1814 void intel_panel_fini(struct intel_panel *panel)
1816 struct intel_connector *intel_connector =
1817 container_of(panel, struct intel_connector, panel);
1819 if (panel->fixed_mode)
1820 drm_mode_destroy(intel_connector->base.dev, panel->fixed_mode);
1822 if (panel->downclock_mode)
1823 drm_mode_destroy(intel_connector->base.dev,
1824 panel->downclock_mode);
1827 void intel_backlight_register(struct drm_device *dev)
1829 struct intel_connector *connector;
1831 list_for_each_entry(connector, &dev->mode_config.connector_list, base.head)
1832 intel_backlight_device_register(connector);
1835 void intel_backlight_unregister(struct drm_device *dev)
1837 struct intel_connector *connector;
1839 list_for_each_entry(connector, &dev->mode_config.connector_list, base.head)
1840 intel_backlight_device_unregister(connector);