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
51 * @dev_priv: i915 device instance
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_i915_private *dev_priv,
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_priv->drm, 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_i915_private *dev_priv = to_i915(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_GEN(dev_priv) >= 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_GEN(dev_priv) >= 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_GEN(dev_priv) >= 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_GEN(dev_priv) < 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_i915_private *dev_priv)
380 /* Assume that the BIOS does not lie through the OpRegion... */
381 if (!i915.panel_ignore_lid && dev_priv->opregion.lid_state) {
382 return *dev_priv->opregion.lid_state & 0x1 ?
383 connector_status_connected :
384 connector_status_disconnected;
387 switch (i915.panel_ignore_lid) {
389 return connector_status_connected;
391 return connector_status_disconnected;
393 return connector_status_unknown;
398 * scale - scale values from one range to another
400 * @source_val: value in range [@source_min..@source_max]
402 * Return @source_val in range [@source_min..@source_max] scaled to range
403 * [@target_min..@target_max].
405 static uint32_t scale(uint32_t source_val,
406 uint32_t source_min, uint32_t source_max,
407 uint32_t target_min, uint32_t target_max)
411 WARN_ON(source_min > source_max);
412 WARN_ON(target_min > target_max);
415 source_val = clamp(source_val, source_min, source_max);
417 /* avoid overflows */
418 target_val = DIV_ROUND_CLOSEST_ULL((uint64_t)(source_val - source_min) *
419 (target_max - target_min), source_max - source_min);
420 target_val += target_min;
425 /* Scale user_level in range [0..user_max] to [hw_min..hw_max]. */
426 static inline u32 scale_user_to_hw(struct intel_connector *connector,
427 u32 user_level, u32 user_max)
429 struct intel_panel *panel = &connector->panel;
431 return scale(user_level, 0, user_max,
432 panel->backlight.min, panel->backlight.max);
435 /* Scale user_level in range [0..user_max] to [0..hw_max], clamping the result
436 * to [hw_min..hw_max]. */
437 static inline u32 clamp_user_to_hw(struct intel_connector *connector,
438 u32 user_level, u32 user_max)
440 struct intel_panel *panel = &connector->panel;
443 hw_level = scale(user_level, 0, user_max, 0, panel->backlight.max);
444 hw_level = clamp(hw_level, panel->backlight.min, panel->backlight.max);
449 /* Scale hw_level in range [hw_min..hw_max] to [0..user_max]. */
450 static inline u32 scale_hw_to_user(struct intel_connector *connector,
451 u32 hw_level, u32 user_max)
453 struct intel_panel *panel = &connector->panel;
455 return scale(hw_level, panel->backlight.min, panel->backlight.max,
459 static u32 intel_panel_compute_brightness(struct intel_connector *connector,
462 struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
463 struct intel_panel *panel = &connector->panel;
465 WARN_ON(panel->backlight.max == 0);
467 if (i915.invert_brightness < 0)
470 if (i915.invert_brightness > 0 ||
471 dev_priv->quirks & QUIRK_INVERT_BRIGHTNESS) {
472 return panel->backlight.max - val + panel->backlight.min;
478 static u32 lpt_get_backlight(struct intel_connector *connector)
480 struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
482 return I915_READ(BLC_PWM_PCH_CTL2) & BACKLIGHT_DUTY_CYCLE_MASK;
485 static u32 pch_get_backlight(struct intel_connector *connector)
487 struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
489 return I915_READ(BLC_PWM_CPU_CTL) & BACKLIGHT_DUTY_CYCLE_MASK;
492 static u32 i9xx_get_backlight(struct intel_connector *connector)
494 struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
495 struct intel_panel *panel = &connector->panel;
498 val = I915_READ(BLC_PWM_CTL) & BACKLIGHT_DUTY_CYCLE_MASK;
499 if (INTEL_INFO(dev_priv)->gen < 4)
502 if (panel->backlight.combination_mode) {
505 pci_read_config_byte(dev_priv->drm.pdev, LBPC, &lbpc);
512 static u32 _vlv_get_backlight(struct drm_i915_private *dev_priv, enum pipe pipe)
514 if (WARN_ON(pipe != PIPE_A && pipe != PIPE_B))
517 return I915_READ(VLV_BLC_PWM_CTL(pipe)) & BACKLIGHT_DUTY_CYCLE_MASK;
520 static u32 vlv_get_backlight(struct intel_connector *connector)
522 struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
523 enum pipe pipe = intel_get_pipe_from_connector(connector);
525 return _vlv_get_backlight(dev_priv, pipe);
528 static u32 bxt_get_backlight(struct intel_connector *connector)
530 struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
531 struct intel_panel *panel = &connector->panel;
533 return I915_READ(BXT_BLC_PWM_DUTY(panel->backlight.controller));
536 static u32 pwm_get_backlight(struct intel_connector *connector)
538 struct intel_panel *panel = &connector->panel;
541 duty_ns = pwm_get_duty_cycle(panel->backlight.pwm);
542 return DIV_ROUND_UP(duty_ns * 100, CRC_PMIC_PWM_PERIOD_NS);
545 static u32 intel_panel_get_backlight(struct intel_connector *connector)
547 struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
548 struct intel_panel *panel = &connector->panel;
551 mutex_lock(&dev_priv->backlight_lock);
553 if (panel->backlight.enabled) {
554 val = panel->backlight.get(connector);
555 val = intel_panel_compute_brightness(connector, val);
558 mutex_unlock(&dev_priv->backlight_lock);
560 DRM_DEBUG_DRIVER("get backlight PWM = %d\n", val);
564 static void lpt_set_backlight(const struct drm_connector_state *conn_state, u32 level)
566 struct intel_connector *connector = to_intel_connector(conn_state->connector);
567 struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
569 u32 val = I915_READ(BLC_PWM_PCH_CTL2) & ~BACKLIGHT_DUTY_CYCLE_MASK;
570 I915_WRITE(BLC_PWM_PCH_CTL2, val | level);
573 static void pch_set_backlight(const struct drm_connector_state *conn_state, u32 level)
575 struct intel_connector *connector = to_intel_connector(conn_state->connector);
576 struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
579 tmp = I915_READ(BLC_PWM_CPU_CTL) & ~BACKLIGHT_DUTY_CYCLE_MASK;
580 I915_WRITE(BLC_PWM_CPU_CTL, tmp | level);
583 static void i9xx_set_backlight(const struct drm_connector_state *conn_state, u32 level)
585 struct intel_connector *connector = to_intel_connector(conn_state->connector);
586 struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
587 struct intel_panel *panel = &connector->panel;
590 WARN_ON(panel->backlight.max == 0);
592 if (panel->backlight.combination_mode) {
595 lbpc = level * 0xfe / panel->backlight.max + 1;
597 pci_write_config_byte(dev_priv->drm.pdev, LBPC, lbpc);
600 if (IS_GEN4(dev_priv)) {
601 mask = BACKLIGHT_DUTY_CYCLE_MASK;
604 mask = BACKLIGHT_DUTY_CYCLE_MASK_PNV;
607 tmp = I915_READ(BLC_PWM_CTL) & ~mask;
608 I915_WRITE(BLC_PWM_CTL, tmp | level);
611 static void vlv_set_backlight(const struct drm_connector_state *conn_state, u32 level)
613 struct intel_connector *connector = to_intel_connector(conn_state->connector);
614 struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
615 enum pipe pipe = to_intel_crtc(conn_state->crtc)->pipe;
618 tmp = I915_READ(VLV_BLC_PWM_CTL(pipe)) & ~BACKLIGHT_DUTY_CYCLE_MASK;
619 I915_WRITE(VLV_BLC_PWM_CTL(pipe), tmp | level);
622 static void bxt_set_backlight(const struct drm_connector_state *conn_state, u32 level)
624 struct intel_connector *connector = to_intel_connector(conn_state->connector);
625 struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
626 struct intel_panel *panel = &connector->panel;
628 I915_WRITE(BXT_BLC_PWM_DUTY(panel->backlight.controller), level);
631 static void pwm_set_backlight(const struct drm_connector_state *conn_state, u32 level)
633 struct intel_panel *panel = &to_intel_connector(conn_state->connector)->panel;
634 int duty_ns = DIV_ROUND_UP(level * CRC_PMIC_PWM_PERIOD_NS, 100);
636 pwm_config(panel->backlight.pwm, duty_ns, CRC_PMIC_PWM_PERIOD_NS);
640 intel_panel_actually_set_backlight(const struct drm_connector_state *conn_state, u32 level)
642 struct intel_connector *connector = to_intel_connector(conn_state->connector);
643 struct intel_panel *panel = &connector->panel;
645 DRM_DEBUG_DRIVER("set backlight PWM = %d\n", level);
647 level = intel_panel_compute_brightness(connector, level);
648 panel->backlight.set(conn_state, level);
651 /* set backlight brightness to level in range [0..max], scaling wrt hw min */
652 static void intel_panel_set_backlight(const struct drm_connector_state *conn_state,
653 u32 user_level, u32 user_max)
655 struct intel_connector *connector = to_intel_connector(conn_state->connector);
656 struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
657 struct intel_panel *panel = &connector->panel;
660 if (!panel->backlight.present)
663 mutex_lock(&dev_priv->backlight_lock);
665 WARN_ON(panel->backlight.max == 0);
667 hw_level = scale_user_to_hw(connector, user_level, user_max);
668 panel->backlight.level = hw_level;
670 if (panel->backlight.enabled)
671 intel_panel_actually_set_backlight(conn_state, hw_level);
673 mutex_unlock(&dev_priv->backlight_lock);
676 /* set backlight brightness to level in range [0..max], assuming hw min is
679 void intel_panel_set_backlight_acpi(const struct drm_connector_state *conn_state,
680 u32 user_level, u32 user_max)
682 struct intel_connector *connector = to_intel_connector(conn_state->connector);
683 struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
684 struct intel_panel *panel = &connector->panel;
688 * Lack of crtc may occur during driver init because
689 * connection_mutex isn't held across the entire backlight
690 * setup + modeset readout, and the BIOS can issue the
691 * requests at any time.
693 if (!panel->backlight.present || !conn_state->crtc)
696 mutex_lock(&dev_priv->backlight_lock);
698 WARN_ON(panel->backlight.max == 0);
700 hw_level = clamp_user_to_hw(connector, user_level, user_max);
701 panel->backlight.level = hw_level;
703 if (panel->backlight.device)
704 panel->backlight.device->props.brightness =
705 scale_hw_to_user(connector,
706 panel->backlight.level,
707 panel->backlight.device->props.max_brightness);
709 if (panel->backlight.enabled)
710 intel_panel_actually_set_backlight(conn_state, hw_level);
712 mutex_unlock(&dev_priv->backlight_lock);
715 static void lpt_disable_backlight(const struct drm_connector_state *old_conn_state)
717 struct intel_connector *connector = to_intel_connector(old_conn_state->connector);
718 struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
721 intel_panel_actually_set_backlight(old_conn_state, 0);
724 * Although we don't support or enable CPU PWM with LPT/SPT based
725 * systems, it may have been enabled prior to loading the
726 * driver. Disable to avoid warnings on LCPLL disable.
728 * This needs rework if we need to add support for CPU PWM on PCH split
731 tmp = I915_READ(BLC_PWM_CPU_CTL2);
732 if (tmp & BLM_PWM_ENABLE) {
733 DRM_DEBUG_KMS("cpu backlight was enabled, disabling\n");
734 I915_WRITE(BLC_PWM_CPU_CTL2, tmp & ~BLM_PWM_ENABLE);
737 tmp = I915_READ(BLC_PWM_PCH_CTL1);
738 I915_WRITE(BLC_PWM_PCH_CTL1, tmp & ~BLM_PCH_PWM_ENABLE);
741 static void pch_disable_backlight(const struct drm_connector_state *old_conn_state)
743 struct intel_connector *connector = to_intel_connector(old_conn_state->connector);
744 struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
747 intel_panel_actually_set_backlight(old_conn_state, 0);
749 tmp = I915_READ(BLC_PWM_CPU_CTL2);
750 I915_WRITE(BLC_PWM_CPU_CTL2, tmp & ~BLM_PWM_ENABLE);
752 tmp = I915_READ(BLC_PWM_PCH_CTL1);
753 I915_WRITE(BLC_PWM_PCH_CTL1, tmp & ~BLM_PCH_PWM_ENABLE);
756 static void i9xx_disable_backlight(const struct drm_connector_state *old_conn_state)
758 intel_panel_actually_set_backlight(old_conn_state, 0);
761 static void i965_disable_backlight(const struct drm_connector_state *old_conn_state)
763 struct drm_i915_private *dev_priv = to_i915(old_conn_state->connector->dev);
766 intel_panel_actually_set_backlight(old_conn_state, 0);
768 tmp = I915_READ(BLC_PWM_CTL2);
769 I915_WRITE(BLC_PWM_CTL2, tmp & ~BLM_PWM_ENABLE);
772 static void vlv_disable_backlight(const struct drm_connector_state *old_conn_state)
774 struct intel_connector *connector = to_intel_connector(old_conn_state->connector);
775 struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
776 enum pipe pipe = to_intel_crtc(old_conn_state->crtc)->pipe;
779 intel_panel_actually_set_backlight(old_conn_state, 0);
781 tmp = I915_READ(VLV_BLC_PWM_CTL2(pipe));
782 I915_WRITE(VLV_BLC_PWM_CTL2(pipe), tmp & ~BLM_PWM_ENABLE);
785 static void bxt_disable_backlight(const struct drm_connector_state *old_conn_state)
787 struct intel_connector *connector = to_intel_connector(old_conn_state->connector);
788 struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
789 struct intel_panel *panel = &connector->panel;
792 intel_panel_actually_set_backlight(old_conn_state, 0);
794 tmp = I915_READ(BXT_BLC_PWM_CTL(panel->backlight.controller));
795 I915_WRITE(BXT_BLC_PWM_CTL(panel->backlight.controller),
796 tmp & ~BXT_BLC_PWM_ENABLE);
798 if (panel->backlight.controller == 1) {
799 val = I915_READ(UTIL_PIN_CTL);
800 val &= ~UTIL_PIN_ENABLE;
801 I915_WRITE(UTIL_PIN_CTL, val);
805 static void cnp_disable_backlight(const struct drm_connector_state *old_conn_state)
807 struct intel_connector *connector = to_intel_connector(old_conn_state->connector);
808 struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
809 struct intel_panel *panel = &connector->panel;
812 intel_panel_actually_set_backlight(old_conn_state, 0);
814 tmp = I915_READ(BXT_BLC_PWM_CTL(panel->backlight.controller));
815 I915_WRITE(BXT_BLC_PWM_CTL(panel->backlight.controller),
816 tmp & ~BXT_BLC_PWM_ENABLE);
819 static void pwm_disable_backlight(const struct drm_connector_state *old_conn_state)
821 struct intel_connector *connector = to_intel_connector(old_conn_state->connector);
822 struct intel_panel *panel = &connector->panel;
824 /* Disable the backlight */
825 pwm_config(panel->backlight.pwm, 0, CRC_PMIC_PWM_PERIOD_NS);
826 usleep_range(2000, 3000);
827 pwm_disable(panel->backlight.pwm);
830 void intel_panel_disable_backlight(const struct drm_connector_state *old_conn_state)
832 struct intel_connector *connector = to_intel_connector(old_conn_state->connector);
833 struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
834 struct intel_panel *panel = &connector->panel;
836 if (!panel->backlight.present)
840 * Do not disable backlight on the vga_switcheroo path. When switching
841 * away from i915, the other client may depend on i915 to handle the
842 * backlight. This will leave the backlight on unnecessarily when
843 * another client is not activated.
845 if (dev_priv->drm.switch_power_state == DRM_SWITCH_POWER_CHANGING) {
846 DRM_DEBUG_DRIVER("Skipping backlight disable on vga switch\n");
850 mutex_lock(&dev_priv->backlight_lock);
852 if (panel->backlight.device)
853 panel->backlight.device->props.power = FB_BLANK_POWERDOWN;
854 panel->backlight.enabled = false;
855 panel->backlight.disable(old_conn_state);
857 mutex_unlock(&dev_priv->backlight_lock);
860 static void lpt_enable_backlight(const struct intel_crtc_state *crtc_state,
861 const struct drm_connector_state *conn_state)
863 struct intel_connector *connector = to_intel_connector(conn_state->connector);
864 struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
865 struct intel_panel *panel = &connector->panel;
866 u32 pch_ctl1, pch_ctl2, schicken;
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 if (HAS_PCH_LPT(dev_priv)) {
876 schicken = I915_READ(SOUTH_CHICKEN2);
877 if (panel->backlight.alternate_pwm_increment)
878 schicken |= LPT_PWM_GRANULARITY;
880 schicken &= ~LPT_PWM_GRANULARITY;
881 I915_WRITE(SOUTH_CHICKEN2, schicken);
883 schicken = I915_READ(SOUTH_CHICKEN1);
884 if (panel->backlight.alternate_pwm_increment)
885 schicken |= SPT_PWM_GRANULARITY;
887 schicken &= ~SPT_PWM_GRANULARITY;
888 I915_WRITE(SOUTH_CHICKEN1, schicken);
891 pch_ctl2 = panel->backlight.max << 16;
892 I915_WRITE(BLC_PWM_PCH_CTL2, pch_ctl2);
895 if (panel->backlight.active_low_pwm)
896 pch_ctl1 |= BLM_PCH_POLARITY;
898 /* After LPT, override is the default. */
899 if (HAS_PCH_LPT(dev_priv))
900 pch_ctl1 |= BLM_PCH_OVERRIDE_ENABLE;
902 I915_WRITE(BLC_PWM_PCH_CTL1, pch_ctl1);
903 POSTING_READ(BLC_PWM_PCH_CTL1);
904 I915_WRITE(BLC_PWM_PCH_CTL1, pch_ctl1 | BLM_PCH_PWM_ENABLE);
906 /* This won't stick until the above enable. */
907 intel_panel_actually_set_backlight(conn_state, panel->backlight.level);
910 static void pch_enable_backlight(const struct intel_crtc_state *crtc_state,
911 const struct drm_connector_state *conn_state)
913 struct intel_connector *connector = to_intel_connector(conn_state->connector);
914 struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
915 struct intel_panel *panel = &connector->panel;
916 enum transcoder cpu_transcoder = crtc_state->cpu_transcoder;
917 u32 cpu_ctl2, pch_ctl1, pch_ctl2;
919 cpu_ctl2 = I915_READ(BLC_PWM_CPU_CTL2);
920 if (cpu_ctl2 & BLM_PWM_ENABLE) {
921 DRM_DEBUG_KMS("cpu backlight already enabled\n");
922 cpu_ctl2 &= ~BLM_PWM_ENABLE;
923 I915_WRITE(BLC_PWM_CPU_CTL2, cpu_ctl2);
926 pch_ctl1 = I915_READ(BLC_PWM_PCH_CTL1);
927 if (pch_ctl1 & BLM_PCH_PWM_ENABLE) {
928 DRM_DEBUG_KMS("pch backlight already enabled\n");
929 pch_ctl1 &= ~BLM_PCH_PWM_ENABLE;
930 I915_WRITE(BLC_PWM_PCH_CTL1, pch_ctl1);
933 if (cpu_transcoder == TRANSCODER_EDP)
934 cpu_ctl2 = BLM_TRANSCODER_EDP;
936 cpu_ctl2 = BLM_PIPE(cpu_transcoder);
937 I915_WRITE(BLC_PWM_CPU_CTL2, cpu_ctl2);
938 POSTING_READ(BLC_PWM_CPU_CTL2);
939 I915_WRITE(BLC_PWM_CPU_CTL2, cpu_ctl2 | BLM_PWM_ENABLE);
941 /* This won't stick until the above enable. */
942 intel_panel_actually_set_backlight(conn_state, panel->backlight.level);
944 pch_ctl2 = panel->backlight.max << 16;
945 I915_WRITE(BLC_PWM_PCH_CTL2, pch_ctl2);
948 if (panel->backlight.active_low_pwm)
949 pch_ctl1 |= BLM_PCH_POLARITY;
951 I915_WRITE(BLC_PWM_PCH_CTL1, pch_ctl1);
952 POSTING_READ(BLC_PWM_PCH_CTL1);
953 I915_WRITE(BLC_PWM_PCH_CTL1, pch_ctl1 | BLM_PCH_PWM_ENABLE);
956 static void i9xx_enable_backlight(const struct intel_crtc_state *crtc_state,
957 const struct drm_connector_state *conn_state)
959 struct intel_connector *connector = to_intel_connector(conn_state->connector);
960 struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
961 struct intel_panel *panel = &connector->panel;
964 ctl = I915_READ(BLC_PWM_CTL);
965 if (ctl & BACKLIGHT_DUTY_CYCLE_MASK_PNV) {
966 DRM_DEBUG_KMS("backlight already enabled\n");
967 I915_WRITE(BLC_PWM_CTL, 0);
970 freq = panel->backlight.max;
971 if (panel->backlight.combination_mode)
975 if (panel->backlight.combination_mode)
976 ctl |= BLM_LEGACY_MODE;
977 if (IS_PINEVIEW(dev_priv) && panel->backlight.active_low_pwm)
978 ctl |= BLM_POLARITY_PNV;
980 I915_WRITE(BLC_PWM_CTL, ctl);
981 POSTING_READ(BLC_PWM_CTL);
983 /* XXX: combine this into above write? */
984 intel_panel_actually_set_backlight(conn_state, panel->backlight.level);
987 * Needed to enable backlight on some 855gm models. BLC_HIST_CTL is
988 * 855gm only, but checking for gen2 is safe, as 855gm is the only gen2
989 * that has backlight.
991 if (IS_GEN2(dev_priv))
992 I915_WRITE(BLC_HIST_CTL, BLM_HISTOGRAM_ENABLE);
995 static void i965_enable_backlight(const struct intel_crtc_state *crtc_state,
996 const struct drm_connector_state *conn_state)
998 struct intel_connector *connector = to_intel_connector(conn_state->connector);
999 struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
1000 struct intel_panel *panel = &connector->panel;
1001 enum pipe pipe = to_intel_crtc(conn_state->crtc)->pipe;
1002 u32 ctl, ctl2, freq;
1004 ctl2 = I915_READ(BLC_PWM_CTL2);
1005 if (ctl2 & BLM_PWM_ENABLE) {
1006 DRM_DEBUG_KMS("backlight already enabled\n");
1007 ctl2 &= ~BLM_PWM_ENABLE;
1008 I915_WRITE(BLC_PWM_CTL2, ctl2);
1011 freq = panel->backlight.max;
1012 if (panel->backlight.combination_mode)
1016 I915_WRITE(BLC_PWM_CTL, ctl);
1018 ctl2 = BLM_PIPE(pipe);
1019 if (panel->backlight.combination_mode)
1020 ctl2 |= BLM_COMBINATION_MODE;
1021 if (panel->backlight.active_low_pwm)
1022 ctl2 |= BLM_POLARITY_I965;
1023 I915_WRITE(BLC_PWM_CTL2, ctl2);
1024 POSTING_READ(BLC_PWM_CTL2);
1025 I915_WRITE(BLC_PWM_CTL2, ctl2 | BLM_PWM_ENABLE);
1027 intel_panel_actually_set_backlight(conn_state, panel->backlight.level);
1030 static void vlv_enable_backlight(const struct intel_crtc_state *crtc_state,
1031 const struct drm_connector_state *conn_state)
1033 struct intel_connector *connector = to_intel_connector(conn_state->connector);
1034 struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
1035 struct intel_panel *panel = &connector->panel;
1036 enum pipe pipe = to_intel_crtc(crtc_state->base.crtc)->pipe;
1039 ctl2 = I915_READ(VLV_BLC_PWM_CTL2(pipe));
1040 if (ctl2 & BLM_PWM_ENABLE) {
1041 DRM_DEBUG_KMS("backlight already enabled\n");
1042 ctl2 &= ~BLM_PWM_ENABLE;
1043 I915_WRITE(VLV_BLC_PWM_CTL2(pipe), ctl2);
1046 ctl = panel->backlight.max << 16;
1047 I915_WRITE(VLV_BLC_PWM_CTL(pipe), ctl);
1049 /* XXX: combine this into above write? */
1050 intel_panel_actually_set_backlight(conn_state, panel->backlight.level);
1053 if (panel->backlight.active_low_pwm)
1054 ctl2 |= BLM_POLARITY_I965;
1055 I915_WRITE(VLV_BLC_PWM_CTL2(pipe), ctl2);
1056 POSTING_READ(VLV_BLC_PWM_CTL2(pipe));
1057 I915_WRITE(VLV_BLC_PWM_CTL2(pipe), ctl2 | BLM_PWM_ENABLE);
1060 static void bxt_enable_backlight(const struct intel_crtc_state *crtc_state,
1061 const struct drm_connector_state *conn_state)
1063 struct intel_connector *connector = to_intel_connector(conn_state->connector);
1064 struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
1065 struct intel_panel *panel = &connector->panel;
1066 enum pipe pipe = to_intel_crtc(crtc_state->base.crtc)->pipe;
1069 /* Controller 1 uses the utility pin. */
1070 if (panel->backlight.controller == 1) {
1071 val = I915_READ(UTIL_PIN_CTL);
1072 if (val & UTIL_PIN_ENABLE) {
1073 DRM_DEBUG_KMS("util pin already enabled\n");
1074 val &= ~UTIL_PIN_ENABLE;
1075 I915_WRITE(UTIL_PIN_CTL, val);
1079 if (panel->backlight.util_pin_active_low)
1080 val |= UTIL_PIN_POLARITY;
1081 I915_WRITE(UTIL_PIN_CTL, val | UTIL_PIN_PIPE(pipe) |
1082 UTIL_PIN_MODE_PWM | UTIL_PIN_ENABLE);
1085 pwm_ctl = I915_READ(BXT_BLC_PWM_CTL(panel->backlight.controller));
1086 if (pwm_ctl & BXT_BLC_PWM_ENABLE) {
1087 DRM_DEBUG_KMS("backlight already enabled\n");
1088 pwm_ctl &= ~BXT_BLC_PWM_ENABLE;
1089 I915_WRITE(BXT_BLC_PWM_CTL(panel->backlight.controller),
1093 I915_WRITE(BXT_BLC_PWM_FREQ(panel->backlight.controller),
1094 panel->backlight.max);
1096 intel_panel_actually_set_backlight(conn_state, panel->backlight.level);
1099 if (panel->backlight.active_low_pwm)
1100 pwm_ctl |= BXT_BLC_PWM_POLARITY;
1102 I915_WRITE(BXT_BLC_PWM_CTL(panel->backlight.controller), pwm_ctl);
1103 POSTING_READ(BXT_BLC_PWM_CTL(panel->backlight.controller));
1104 I915_WRITE(BXT_BLC_PWM_CTL(panel->backlight.controller),
1105 pwm_ctl | BXT_BLC_PWM_ENABLE);
1108 static void cnp_enable_backlight(const struct intel_crtc_state *crtc_state,
1109 const struct drm_connector_state *conn_state)
1111 struct intel_connector *connector = to_intel_connector(conn_state->connector);
1112 struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
1113 struct intel_panel *panel = &connector->panel;
1116 pwm_ctl = I915_READ(BXT_BLC_PWM_CTL(panel->backlight.controller));
1117 if (pwm_ctl & BXT_BLC_PWM_ENABLE) {
1118 DRM_DEBUG_KMS("backlight already enabled\n");
1119 pwm_ctl &= ~BXT_BLC_PWM_ENABLE;
1120 I915_WRITE(BXT_BLC_PWM_CTL(panel->backlight.controller),
1124 I915_WRITE(BXT_BLC_PWM_FREQ(panel->backlight.controller),
1125 panel->backlight.max);
1127 intel_panel_actually_set_backlight(conn_state, panel->backlight.level);
1130 if (panel->backlight.active_low_pwm)
1131 pwm_ctl |= BXT_BLC_PWM_POLARITY;
1133 I915_WRITE(BXT_BLC_PWM_CTL(panel->backlight.controller), pwm_ctl);
1134 POSTING_READ(BXT_BLC_PWM_CTL(panel->backlight.controller));
1135 I915_WRITE(BXT_BLC_PWM_CTL(panel->backlight.controller),
1136 pwm_ctl | BXT_BLC_PWM_ENABLE);
1139 static void pwm_enable_backlight(const struct intel_crtc_state *crtc_state,
1140 const struct drm_connector_state *conn_state)
1142 struct intel_connector *connector = to_intel_connector(conn_state->connector);
1143 struct intel_panel *panel = &connector->panel;
1145 pwm_enable(panel->backlight.pwm);
1146 intel_panel_actually_set_backlight(conn_state, panel->backlight.level);
1149 void intel_panel_enable_backlight(const struct intel_crtc_state *crtc_state,
1150 const struct drm_connector_state *conn_state)
1152 struct intel_connector *connector = to_intel_connector(conn_state->connector);
1153 struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
1154 struct intel_panel *panel = &connector->panel;
1155 enum pipe pipe = to_intel_crtc(crtc_state->base.crtc)->pipe;
1157 if (!panel->backlight.present)
1160 DRM_DEBUG_KMS("pipe %c\n", pipe_name(pipe));
1162 mutex_lock(&dev_priv->backlight_lock);
1164 WARN_ON(panel->backlight.max == 0);
1166 if (panel->backlight.level <= panel->backlight.min) {
1167 panel->backlight.level = panel->backlight.max;
1168 if (panel->backlight.device)
1169 panel->backlight.device->props.brightness =
1170 scale_hw_to_user(connector,
1171 panel->backlight.level,
1172 panel->backlight.device->props.max_brightness);
1175 panel->backlight.enable(crtc_state, conn_state);
1176 panel->backlight.enabled = true;
1177 if (panel->backlight.device)
1178 panel->backlight.device->props.power = FB_BLANK_UNBLANK;
1180 mutex_unlock(&dev_priv->backlight_lock);
1183 #if IS_ENABLED(CONFIG_BACKLIGHT_CLASS_DEVICE)
1184 static int intel_backlight_device_update_status(struct backlight_device *bd)
1186 struct intel_connector *connector = bl_get_data(bd);
1187 struct intel_panel *panel = &connector->panel;
1188 struct drm_device *dev = connector->base.dev;
1190 drm_modeset_lock(&dev->mode_config.connection_mutex, NULL);
1191 DRM_DEBUG_KMS("updating intel_backlight, brightness=%d/%d\n",
1192 bd->props.brightness, bd->props.max_brightness);
1193 intel_panel_set_backlight(connector->base.state, bd->props.brightness,
1194 bd->props.max_brightness);
1197 * Allow flipping bl_power as a sub-state of enabled. Sadly the
1198 * backlight class device does not make it easy to to differentiate
1199 * between callbacks for brightness and bl_power, so our backlight_power
1200 * callback needs to take this into account.
1202 if (panel->backlight.enabled) {
1203 if (panel->backlight.power) {
1204 bool enable = bd->props.power == FB_BLANK_UNBLANK &&
1205 bd->props.brightness != 0;
1206 panel->backlight.power(connector, enable);
1209 bd->props.power = FB_BLANK_POWERDOWN;
1212 drm_modeset_unlock(&dev->mode_config.connection_mutex);
1216 static int intel_backlight_device_get_brightness(struct backlight_device *bd)
1218 struct intel_connector *connector = bl_get_data(bd);
1219 struct drm_device *dev = connector->base.dev;
1220 struct drm_i915_private *dev_priv = to_i915(dev);
1224 intel_runtime_pm_get(dev_priv);
1225 drm_modeset_lock(&dev->mode_config.connection_mutex, NULL);
1227 hw_level = intel_panel_get_backlight(connector);
1228 ret = scale_hw_to_user(connector, hw_level, bd->props.max_brightness);
1230 drm_modeset_unlock(&dev->mode_config.connection_mutex);
1231 intel_runtime_pm_put(dev_priv);
1236 static const struct backlight_ops intel_backlight_device_ops = {
1237 .update_status = intel_backlight_device_update_status,
1238 .get_brightness = intel_backlight_device_get_brightness,
1241 int intel_backlight_device_register(struct intel_connector *connector)
1243 struct intel_panel *panel = &connector->panel;
1244 struct backlight_properties props;
1246 if (WARN_ON(panel->backlight.device))
1249 if (!panel->backlight.present)
1252 WARN_ON(panel->backlight.max == 0);
1254 memset(&props, 0, sizeof(props));
1255 props.type = BACKLIGHT_RAW;
1258 * Note: Everything should work even if the backlight device max
1259 * presented to the userspace is arbitrarily chosen.
1261 props.max_brightness = panel->backlight.max;
1262 props.brightness = scale_hw_to_user(connector,
1263 panel->backlight.level,
1264 props.max_brightness);
1266 if (panel->backlight.enabled)
1267 props.power = FB_BLANK_UNBLANK;
1269 props.power = FB_BLANK_POWERDOWN;
1272 * Note: using the same name independent of the connector prevents
1273 * registration of multiple backlight devices in the driver.
1275 panel->backlight.device =
1276 backlight_device_register("intel_backlight",
1277 connector->base.kdev,
1279 &intel_backlight_device_ops, &props);
1281 if (IS_ERR(panel->backlight.device)) {
1282 DRM_ERROR("Failed to register backlight: %ld\n",
1283 PTR_ERR(panel->backlight.device));
1284 panel->backlight.device = NULL;
1288 DRM_DEBUG_KMS("Connector %s backlight sysfs interface registered\n",
1289 connector->base.name);
1294 void intel_backlight_device_unregister(struct intel_connector *connector)
1296 struct intel_panel *panel = &connector->panel;
1298 if (panel->backlight.device) {
1299 backlight_device_unregister(panel->backlight.device);
1300 panel->backlight.device = NULL;
1303 #endif /* CONFIG_BACKLIGHT_CLASS_DEVICE */
1306 * CNP: PWM clock frequency is 19.2 MHz or 24 MHz.
1309 static u32 cnp_hz_to_pwm(struct intel_connector *connector, u32 pwm_freq_hz)
1311 struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
1313 return DIV_ROUND_CLOSEST(KHz(dev_priv->rawclk_freq), pwm_freq_hz);
1317 * BXT: PWM clock frequency = 19.2 MHz.
1319 static u32 bxt_hz_to_pwm(struct intel_connector *connector, u32 pwm_freq_hz)
1321 return DIV_ROUND_CLOSEST(KHz(19200), pwm_freq_hz);
1325 * SPT: This value represents the period of the PWM stream in clock periods
1326 * multiplied by 16 (default increment) or 128 (alternate increment selected in
1327 * SCHICKEN_1 bit 0). PWM clock is 24 MHz.
1329 static u32 spt_hz_to_pwm(struct intel_connector *connector, u32 pwm_freq_hz)
1331 struct intel_panel *panel = &connector->panel;
1334 if (panel->backlight.alternate_pwm_increment)
1339 return DIV_ROUND_CLOSEST(MHz(24), pwm_freq_hz * mul);
1343 * LPT: This value represents the period of the PWM stream in clock periods
1344 * multiplied by 128 (default increment) or 16 (alternate increment, selected in
1345 * LPT SOUTH_CHICKEN2 register bit 5).
1347 static u32 lpt_hz_to_pwm(struct intel_connector *connector, u32 pwm_freq_hz)
1349 struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
1350 struct intel_panel *panel = &connector->panel;
1353 if (panel->backlight.alternate_pwm_increment)
1358 if (HAS_PCH_LPT_H(dev_priv))
1359 clock = MHz(135); /* LPT:H */
1361 clock = MHz(24); /* LPT:LP */
1363 return DIV_ROUND_CLOSEST(clock, pwm_freq_hz * mul);
1367 * ILK/SNB/IVB: This value represents the period of the PWM stream in PCH
1368 * display raw clocks multiplied by 128.
1370 static u32 pch_hz_to_pwm(struct intel_connector *connector, u32 pwm_freq_hz)
1372 struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
1374 return DIV_ROUND_CLOSEST(KHz(dev_priv->rawclk_freq), pwm_freq_hz * 128);
1378 * Gen2: This field determines the number of time base events (display core
1379 * clock frequency/32) in total for a complete cycle of modulated backlight
1382 * Gen3: A time base event equals the display core clock ([DevPNV] HRAW clock)
1385 static u32 i9xx_hz_to_pwm(struct intel_connector *connector, u32 pwm_freq_hz)
1387 struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
1390 if (IS_PINEVIEW(dev_priv))
1391 clock = KHz(dev_priv->rawclk_freq);
1393 clock = KHz(dev_priv->cdclk.hw.cdclk);
1395 return DIV_ROUND_CLOSEST(clock, pwm_freq_hz * 32);
1399 * Gen4: This value represents the period of the PWM stream in display core
1400 * clocks ([DevCTG] HRAW clocks) multiplied by 128.
1403 static u32 i965_hz_to_pwm(struct intel_connector *connector, u32 pwm_freq_hz)
1405 struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
1408 if (IS_G4X(dev_priv))
1409 clock = KHz(dev_priv->rawclk_freq);
1411 clock = KHz(dev_priv->cdclk.hw.cdclk);
1413 return DIV_ROUND_CLOSEST(clock, pwm_freq_hz * 128);
1417 * VLV: This value represents the period of the PWM stream in display core
1418 * clocks ([DevCTG] 200MHz HRAW clocks) multiplied by 128 or 25MHz S0IX clocks
1419 * multiplied by 16. CHV uses a 19.2MHz S0IX clock.
1421 static u32 vlv_hz_to_pwm(struct intel_connector *connector, u32 pwm_freq_hz)
1423 struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
1426 if ((I915_READ(CBR1_VLV) & CBR_PWM_CLOCK_MUX_SELECT) == 0) {
1427 if (IS_CHERRYVIEW(dev_priv))
1433 clock = KHz(dev_priv->rawclk_freq);
1437 return DIV_ROUND_CLOSEST(clock, pwm_freq_hz * mul);
1440 static u32 get_backlight_max_vbt(struct intel_connector *connector)
1442 struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
1443 struct intel_panel *panel = &connector->panel;
1444 u16 pwm_freq_hz = dev_priv->vbt.backlight.pwm_freq_hz;
1447 if (!panel->backlight.hz_to_pwm) {
1448 DRM_DEBUG_KMS("backlight frequency conversion not supported\n");
1453 DRM_DEBUG_KMS("VBT defined backlight frequency %u Hz\n",
1457 DRM_DEBUG_KMS("default backlight frequency %u Hz\n",
1461 pwm = panel->backlight.hz_to_pwm(connector, pwm_freq_hz);
1463 DRM_DEBUG_KMS("backlight frequency conversion failed\n");
1471 * Note: The setup hooks can't assume pipe is set!
1473 static u32 get_backlight_min_vbt(struct intel_connector *connector)
1475 struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
1476 struct intel_panel *panel = &connector->panel;
1479 WARN_ON(panel->backlight.max == 0);
1482 * XXX: If the vbt value is 255, it makes min equal to max, which leads
1483 * to problems. There are such machines out there. Either our
1484 * interpretation is wrong or the vbt has bogus data. Or both. Safeguard
1485 * against this by letting the minimum be at most (arbitrarily chosen)
1488 min = clamp_t(int, dev_priv->vbt.backlight.min_brightness, 0, 64);
1489 if (min != dev_priv->vbt.backlight.min_brightness) {
1490 DRM_DEBUG_KMS("clamping VBT min backlight %d/255 to %d/255\n",
1491 dev_priv->vbt.backlight.min_brightness, min);
1494 /* vbt value is a coefficient in range [0..255] */
1495 return scale(min, 0, 255, 0, panel->backlight.max);
1498 static int lpt_setup_backlight(struct intel_connector *connector, enum pipe unused)
1500 struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
1501 struct intel_panel *panel = &connector->panel;
1502 u32 pch_ctl1, pch_ctl2, val;
1505 if (HAS_PCH_LPT(dev_priv))
1506 alt = I915_READ(SOUTH_CHICKEN2) & LPT_PWM_GRANULARITY;
1508 alt = I915_READ(SOUTH_CHICKEN1) & SPT_PWM_GRANULARITY;
1509 panel->backlight.alternate_pwm_increment = alt;
1511 pch_ctl1 = I915_READ(BLC_PWM_PCH_CTL1);
1512 panel->backlight.active_low_pwm = pch_ctl1 & BLM_PCH_POLARITY;
1514 pch_ctl2 = I915_READ(BLC_PWM_PCH_CTL2);
1515 panel->backlight.max = pch_ctl2 >> 16;
1517 if (!panel->backlight.max)
1518 panel->backlight.max = get_backlight_max_vbt(connector);
1520 if (!panel->backlight.max)
1523 panel->backlight.min = get_backlight_min_vbt(connector);
1525 val = lpt_get_backlight(connector);
1526 val = intel_panel_compute_brightness(connector, val);
1527 panel->backlight.level = clamp(val, panel->backlight.min,
1528 panel->backlight.max);
1530 panel->backlight.enabled = pch_ctl1 & BLM_PCH_PWM_ENABLE;
1535 static int pch_setup_backlight(struct intel_connector *connector, enum pipe unused)
1537 struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
1538 struct intel_panel *panel = &connector->panel;
1539 u32 cpu_ctl2, pch_ctl1, pch_ctl2, val;
1541 pch_ctl1 = I915_READ(BLC_PWM_PCH_CTL1);
1542 panel->backlight.active_low_pwm = pch_ctl1 & BLM_PCH_POLARITY;
1544 pch_ctl2 = I915_READ(BLC_PWM_PCH_CTL2);
1545 panel->backlight.max = pch_ctl2 >> 16;
1547 if (!panel->backlight.max)
1548 panel->backlight.max = get_backlight_max_vbt(connector);
1550 if (!panel->backlight.max)
1553 panel->backlight.min = get_backlight_min_vbt(connector);
1555 val = pch_get_backlight(connector);
1556 val = intel_panel_compute_brightness(connector, val);
1557 panel->backlight.level = clamp(val, panel->backlight.min,
1558 panel->backlight.max);
1560 cpu_ctl2 = I915_READ(BLC_PWM_CPU_CTL2);
1561 panel->backlight.enabled = (cpu_ctl2 & BLM_PWM_ENABLE) &&
1562 (pch_ctl1 & BLM_PCH_PWM_ENABLE);
1567 static int i9xx_setup_backlight(struct intel_connector *connector, enum pipe unused)
1569 struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
1570 struct intel_panel *panel = &connector->panel;
1573 ctl = I915_READ(BLC_PWM_CTL);
1575 if (IS_GEN2(dev_priv) || IS_I915GM(dev_priv) || IS_I945GM(dev_priv))
1576 panel->backlight.combination_mode = ctl & BLM_LEGACY_MODE;
1578 if (IS_PINEVIEW(dev_priv))
1579 panel->backlight.active_low_pwm = ctl & BLM_POLARITY_PNV;
1581 panel->backlight.max = ctl >> 17;
1583 if (!panel->backlight.max) {
1584 panel->backlight.max = get_backlight_max_vbt(connector);
1585 panel->backlight.max >>= 1;
1588 if (!panel->backlight.max)
1591 if (panel->backlight.combination_mode)
1592 panel->backlight.max *= 0xff;
1594 panel->backlight.min = get_backlight_min_vbt(connector);
1596 val = i9xx_get_backlight(connector);
1597 val = intel_panel_compute_brightness(connector, val);
1598 panel->backlight.level = clamp(val, panel->backlight.min,
1599 panel->backlight.max);
1601 panel->backlight.enabled = val != 0;
1606 static int i965_setup_backlight(struct intel_connector *connector, enum pipe unused)
1608 struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
1609 struct intel_panel *panel = &connector->panel;
1612 ctl2 = I915_READ(BLC_PWM_CTL2);
1613 panel->backlight.combination_mode = ctl2 & BLM_COMBINATION_MODE;
1614 panel->backlight.active_low_pwm = ctl2 & BLM_POLARITY_I965;
1616 ctl = I915_READ(BLC_PWM_CTL);
1617 panel->backlight.max = ctl >> 16;
1619 if (!panel->backlight.max)
1620 panel->backlight.max = get_backlight_max_vbt(connector);
1622 if (!panel->backlight.max)
1625 if (panel->backlight.combination_mode)
1626 panel->backlight.max *= 0xff;
1628 panel->backlight.min = get_backlight_min_vbt(connector);
1630 val = i9xx_get_backlight(connector);
1631 val = intel_panel_compute_brightness(connector, val);
1632 panel->backlight.level = clamp(val, panel->backlight.min,
1633 panel->backlight.max);
1635 panel->backlight.enabled = ctl2 & BLM_PWM_ENABLE;
1640 static int vlv_setup_backlight(struct intel_connector *connector, enum pipe pipe)
1642 struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
1643 struct intel_panel *panel = &connector->panel;
1646 if (WARN_ON(pipe != PIPE_A && pipe != PIPE_B))
1649 ctl2 = I915_READ(VLV_BLC_PWM_CTL2(pipe));
1650 panel->backlight.active_low_pwm = ctl2 & BLM_POLARITY_I965;
1652 ctl = I915_READ(VLV_BLC_PWM_CTL(pipe));
1653 panel->backlight.max = ctl >> 16;
1655 if (!panel->backlight.max)
1656 panel->backlight.max = get_backlight_max_vbt(connector);
1658 if (!panel->backlight.max)
1661 panel->backlight.min = get_backlight_min_vbt(connector);
1663 val = _vlv_get_backlight(dev_priv, pipe);
1664 val = intel_panel_compute_brightness(connector, val);
1665 panel->backlight.level = clamp(val, panel->backlight.min,
1666 panel->backlight.max);
1668 panel->backlight.enabled = ctl2 & BLM_PWM_ENABLE;
1674 bxt_setup_backlight(struct intel_connector *connector, enum pipe unused)
1676 struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
1677 struct intel_panel *panel = &connector->panel;
1680 panel->backlight.controller = dev_priv->vbt.backlight.controller;
1682 pwm_ctl = I915_READ(BXT_BLC_PWM_CTL(panel->backlight.controller));
1684 /* Controller 1 uses the utility pin. */
1685 if (panel->backlight.controller == 1) {
1686 val = I915_READ(UTIL_PIN_CTL);
1687 panel->backlight.util_pin_active_low =
1688 val & UTIL_PIN_POLARITY;
1691 panel->backlight.active_low_pwm = pwm_ctl & BXT_BLC_PWM_POLARITY;
1692 panel->backlight.max =
1693 I915_READ(BXT_BLC_PWM_FREQ(panel->backlight.controller));
1695 if (!panel->backlight.max)
1696 panel->backlight.max = get_backlight_max_vbt(connector);
1698 if (!panel->backlight.max)
1701 val = bxt_get_backlight(connector);
1702 val = intel_panel_compute_brightness(connector, val);
1703 panel->backlight.level = clamp(val, panel->backlight.min,
1704 panel->backlight.max);
1706 panel->backlight.enabled = pwm_ctl & BXT_BLC_PWM_ENABLE;
1712 cnp_setup_backlight(struct intel_connector *connector, enum pipe unused)
1714 struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
1715 struct intel_panel *panel = &connector->panel;
1719 * CNP has the BXT implementation of backlight, but with only
1720 * one controller. Future platforms could have multiple controllers
1721 * so let's make this extensible and prepared for the future.
1723 panel->backlight.controller = 0;
1725 pwm_ctl = I915_READ(BXT_BLC_PWM_CTL(panel->backlight.controller));
1727 panel->backlight.active_low_pwm = pwm_ctl & BXT_BLC_PWM_POLARITY;
1728 panel->backlight.max =
1729 I915_READ(BXT_BLC_PWM_FREQ(panel->backlight.controller));
1731 if (!panel->backlight.max)
1732 panel->backlight.max = get_backlight_max_vbt(connector);
1734 if (!panel->backlight.max)
1737 val = bxt_get_backlight(connector);
1738 val = intel_panel_compute_brightness(connector, val);
1739 panel->backlight.level = clamp(val, panel->backlight.min,
1740 panel->backlight.max);
1742 panel->backlight.enabled = pwm_ctl & BXT_BLC_PWM_ENABLE;
1747 static int pwm_setup_backlight(struct intel_connector *connector,
1750 struct drm_device *dev = connector->base.dev;
1751 struct intel_panel *panel = &connector->panel;
1754 /* Get the PWM chip for backlight control */
1755 panel->backlight.pwm = pwm_get(dev->dev, "pwm_backlight");
1756 if (IS_ERR(panel->backlight.pwm)) {
1757 DRM_ERROR("Failed to own the pwm chip\n");
1758 panel->backlight.pwm = NULL;
1763 * FIXME: pwm_apply_args() should be removed when switching to
1764 * the atomic PWM API.
1766 pwm_apply_args(panel->backlight.pwm);
1768 retval = pwm_config(panel->backlight.pwm, CRC_PMIC_PWM_PERIOD_NS,
1769 CRC_PMIC_PWM_PERIOD_NS);
1771 DRM_ERROR("Failed to configure the pwm chip\n");
1772 pwm_put(panel->backlight.pwm);
1773 panel->backlight.pwm = NULL;
1777 panel->backlight.min = 0; /* 0% */
1778 panel->backlight.max = 100; /* 100% */
1779 panel->backlight.level = DIV_ROUND_UP(
1780 pwm_get_duty_cycle(panel->backlight.pwm) * 100,
1781 CRC_PMIC_PWM_PERIOD_NS);
1782 panel->backlight.enabled = panel->backlight.level != 0;
1787 int intel_panel_setup_backlight(struct drm_connector *connector, enum pipe pipe)
1789 struct drm_i915_private *dev_priv = to_i915(connector->dev);
1790 struct intel_connector *intel_connector = to_intel_connector(connector);
1791 struct intel_panel *panel = &intel_connector->panel;
1794 if (!dev_priv->vbt.backlight.present) {
1795 if (dev_priv->quirks & QUIRK_BACKLIGHT_PRESENT) {
1796 DRM_DEBUG_KMS("no backlight present per VBT, but present per quirk\n");
1798 DRM_DEBUG_KMS("no backlight present per VBT\n");
1803 /* ensure intel_panel has been initialized first */
1804 if (WARN_ON(!panel->backlight.setup))
1807 /* set level and max in panel struct */
1808 mutex_lock(&dev_priv->backlight_lock);
1809 ret = panel->backlight.setup(intel_connector, pipe);
1810 mutex_unlock(&dev_priv->backlight_lock);
1813 DRM_DEBUG_KMS("failed to setup backlight for connector %s\n",
1818 panel->backlight.present = true;
1820 DRM_DEBUG_KMS("Connector %s backlight initialized, %s, brightness %u/%u\n",
1822 enableddisabled(panel->backlight.enabled),
1823 panel->backlight.level, panel->backlight.max);
1828 void intel_panel_destroy_backlight(struct drm_connector *connector)
1830 struct intel_connector *intel_connector = to_intel_connector(connector);
1831 struct intel_panel *panel = &intel_connector->panel;
1833 /* dispose of the pwm */
1834 if (panel->backlight.pwm)
1835 pwm_put(panel->backlight.pwm);
1837 panel->backlight.present = false;
1840 /* Set up chip specific backlight functions */
1842 intel_panel_init_backlight_funcs(struct intel_panel *panel)
1844 struct intel_connector *connector =
1845 container_of(panel, struct intel_connector, panel);
1846 struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
1848 if (connector->base.connector_type == DRM_MODE_CONNECTOR_eDP &&
1849 intel_dp_aux_init_backlight_funcs(connector) == 0)
1852 if (connector->base.connector_type == DRM_MODE_CONNECTOR_DSI &&
1853 intel_dsi_dcs_init_backlight_funcs(connector) == 0)
1856 if (IS_GEN9_LP(dev_priv)) {
1857 panel->backlight.setup = bxt_setup_backlight;
1858 panel->backlight.enable = bxt_enable_backlight;
1859 panel->backlight.disable = bxt_disable_backlight;
1860 panel->backlight.set = bxt_set_backlight;
1861 panel->backlight.get = bxt_get_backlight;
1862 panel->backlight.hz_to_pwm = bxt_hz_to_pwm;
1863 } else if (HAS_PCH_CNP(dev_priv)) {
1864 panel->backlight.setup = cnp_setup_backlight;
1865 panel->backlight.enable = cnp_enable_backlight;
1866 panel->backlight.disable = cnp_disable_backlight;
1867 panel->backlight.set = bxt_set_backlight;
1868 panel->backlight.get = bxt_get_backlight;
1869 panel->backlight.hz_to_pwm = cnp_hz_to_pwm;
1870 } else if (HAS_PCH_LPT(dev_priv) || HAS_PCH_SPT(dev_priv) ||
1871 HAS_PCH_KBP(dev_priv)) {
1872 panel->backlight.setup = lpt_setup_backlight;
1873 panel->backlight.enable = lpt_enable_backlight;
1874 panel->backlight.disable = lpt_disable_backlight;
1875 panel->backlight.set = lpt_set_backlight;
1876 panel->backlight.get = lpt_get_backlight;
1877 if (HAS_PCH_LPT(dev_priv))
1878 panel->backlight.hz_to_pwm = lpt_hz_to_pwm;
1880 panel->backlight.hz_to_pwm = spt_hz_to_pwm;
1881 } else if (HAS_PCH_SPLIT(dev_priv)) {
1882 panel->backlight.setup = pch_setup_backlight;
1883 panel->backlight.enable = pch_enable_backlight;
1884 panel->backlight.disable = pch_disable_backlight;
1885 panel->backlight.set = pch_set_backlight;
1886 panel->backlight.get = pch_get_backlight;
1887 panel->backlight.hz_to_pwm = pch_hz_to_pwm;
1888 } else if (IS_VALLEYVIEW(dev_priv) || IS_CHERRYVIEW(dev_priv)) {
1889 if (connector->base.connector_type == DRM_MODE_CONNECTOR_DSI) {
1890 panel->backlight.setup = pwm_setup_backlight;
1891 panel->backlight.enable = pwm_enable_backlight;
1892 panel->backlight.disable = pwm_disable_backlight;
1893 panel->backlight.set = pwm_set_backlight;
1894 panel->backlight.get = pwm_get_backlight;
1896 panel->backlight.setup = vlv_setup_backlight;
1897 panel->backlight.enable = vlv_enable_backlight;
1898 panel->backlight.disable = vlv_disable_backlight;
1899 panel->backlight.set = vlv_set_backlight;
1900 panel->backlight.get = vlv_get_backlight;
1901 panel->backlight.hz_to_pwm = vlv_hz_to_pwm;
1903 } else if (IS_GEN4(dev_priv)) {
1904 panel->backlight.setup = i965_setup_backlight;
1905 panel->backlight.enable = i965_enable_backlight;
1906 panel->backlight.disable = i965_disable_backlight;
1907 panel->backlight.set = i9xx_set_backlight;
1908 panel->backlight.get = i9xx_get_backlight;
1909 panel->backlight.hz_to_pwm = i965_hz_to_pwm;
1911 panel->backlight.setup = i9xx_setup_backlight;
1912 panel->backlight.enable = i9xx_enable_backlight;
1913 panel->backlight.disable = i9xx_disable_backlight;
1914 panel->backlight.set = i9xx_set_backlight;
1915 panel->backlight.get = i9xx_get_backlight;
1916 panel->backlight.hz_to_pwm = i9xx_hz_to_pwm;
1920 int intel_panel_init(struct intel_panel *panel,
1921 struct drm_display_mode *fixed_mode,
1922 struct drm_display_mode *downclock_mode)
1924 intel_panel_init_backlight_funcs(panel);
1926 panel->fixed_mode = fixed_mode;
1927 panel->downclock_mode = downclock_mode;
1932 void intel_panel_fini(struct intel_panel *panel)
1934 struct intel_connector *intel_connector =
1935 container_of(panel, struct intel_connector, panel);
1937 if (panel->fixed_mode)
1938 drm_mode_destroy(intel_connector->base.dev, panel->fixed_mode);
1940 if (panel->downclock_mode)
1941 drm_mode_destroy(intel_connector->base.dev,
1942 panel->downclock_mode);