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
= to_i915(dev
);
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_i915_private
*dev_priv
= to_i915(connector
->base
.dev
);
465 struct intel_panel
*panel
= &connector
->panel
;
467 WARN_ON(panel
->backlight
.max
== 0);
469 if (i915
.invert_brightness
< 0)
472 if (i915
.invert_brightness
> 0 ||
473 dev_priv
->quirks
& QUIRK_INVERT_BRIGHTNESS
) {
474 return panel
->backlight
.max
- val
;
480 static u32
lpt_get_backlight(struct intel_connector
*connector
)
482 struct drm_i915_private
*dev_priv
= to_i915(connector
->base
.dev
);
484 return I915_READ(BLC_PWM_PCH_CTL2
) & BACKLIGHT_DUTY_CYCLE_MASK
;
487 static u32
pch_get_backlight(struct intel_connector
*connector
)
489 struct drm_i915_private
*dev_priv
= to_i915(connector
->base
.dev
);
491 return I915_READ(BLC_PWM_CPU_CTL
) & BACKLIGHT_DUTY_CYCLE_MASK
;
494 static u32
i9xx_get_backlight(struct intel_connector
*connector
)
496 struct drm_i915_private
*dev_priv
= to_i915(connector
->base
.dev
);
497 struct intel_panel
*panel
= &connector
->panel
;
500 val
= I915_READ(BLC_PWM_CTL
) & BACKLIGHT_DUTY_CYCLE_MASK
;
501 if (INTEL_INFO(dev_priv
)->gen
< 4)
504 if (panel
->backlight
.combination_mode
) {
507 pci_read_config_byte(dev_priv
->drm
.pdev
, LBPC
, &lbpc
);
514 static u32
_vlv_get_backlight(struct drm_i915_private
*dev_priv
, enum pipe pipe
)
516 if (WARN_ON(pipe
!= PIPE_A
&& pipe
!= PIPE_B
))
519 return I915_READ(VLV_BLC_PWM_CTL(pipe
)) & BACKLIGHT_DUTY_CYCLE_MASK
;
522 static u32
vlv_get_backlight(struct intel_connector
*connector
)
524 struct drm_i915_private
*dev_priv
= to_i915(connector
->base
.dev
);
525 enum pipe pipe
= intel_get_pipe_from_connector(connector
);
527 return _vlv_get_backlight(dev_priv
, pipe
);
530 static u32
bxt_get_backlight(struct intel_connector
*connector
)
532 struct drm_i915_private
*dev_priv
= to_i915(connector
->base
.dev
);
533 struct intel_panel
*panel
= &connector
->panel
;
535 return I915_READ(BXT_BLC_PWM_DUTY(panel
->backlight
.controller
));
538 static u32
pwm_get_backlight(struct intel_connector
*connector
)
540 struct intel_panel
*panel
= &connector
->panel
;
543 duty_ns
= pwm_get_duty_cycle(panel
->backlight
.pwm
);
544 return DIV_ROUND_UP(duty_ns
* 100, CRC_PMIC_PWM_PERIOD_NS
);
547 static u32
intel_panel_get_backlight(struct intel_connector
*connector
)
549 struct drm_i915_private
*dev_priv
= to_i915(connector
->base
.dev
);
550 struct intel_panel
*panel
= &connector
->panel
;
553 mutex_lock(&dev_priv
->backlight_lock
);
555 if (panel
->backlight
.enabled
) {
556 val
= panel
->backlight
.get(connector
);
557 val
= intel_panel_compute_brightness(connector
, val
);
560 mutex_unlock(&dev_priv
->backlight_lock
);
562 DRM_DEBUG_DRIVER("get backlight PWM = %d\n", val
);
566 static void lpt_set_backlight(struct intel_connector
*connector
, u32 level
)
568 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(struct intel_connector
*connector
, u32 level
)
575 struct drm_i915_private
*dev_priv
= to_i915(connector
->base
.dev
);
578 tmp
= I915_READ(BLC_PWM_CPU_CTL
) & ~BACKLIGHT_DUTY_CYCLE_MASK
;
579 I915_WRITE(BLC_PWM_CPU_CTL
, tmp
| level
);
582 static void i9xx_set_backlight(struct intel_connector
*connector
, u32 level
)
584 struct drm_i915_private
*dev_priv
= to_i915(connector
->base
.dev
);
585 struct intel_panel
*panel
= &connector
->panel
;
588 WARN_ON(panel
->backlight
.max
== 0);
590 if (panel
->backlight
.combination_mode
) {
593 lbpc
= level
* 0xfe / panel
->backlight
.max
+ 1;
595 pci_write_config_byte(dev_priv
->drm
.pdev
, LBPC
, lbpc
);
598 if (IS_GEN4(dev_priv
)) {
599 mask
= BACKLIGHT_DUTY_CYCLE_MASK
;
602 mask
= BACKLIGHT_DUTY_CYCLE_MASK_PNV
;
605 tmp
= I915_READ(BLC_PWM_CTL
) & ~mask
;
606 I915_WRITE(BLC_PWM_CTL
, tmp
| level
);
609 static void vlv_set_backlight(struct intel_connector
*connector
, u32 level
)
611 struct drm_i915_private
*dev_priv
= to_i915(connector
->base
.dev
);
612 enum pipe pipe
= intel_get_pipe_from_connector(connector
);
615 if (WARN_ON(pipe
!= PIPE_A
&& pipe
!= PIPE_B
))
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(struct intel_connector
*connector
, u32 level
)
624 struct drm_i915_private
*dev_priv
= to_i915(connector
->base
.dev
);
625 struct intel_panel
*panel
= &connector
->panel
;
627 I915_WRITE(BXT_BLC_PWM_DUTY(panel
->backlight
.controller
), level
);
630 static void pwm_set_backlight(struct intel_connector
*connector
, u32 level
)
632 struct intel_panel
*panel
= &connector
->panel
;
633 int duty_ns
= DIV_ROUND_UP(level
* CRC_PMIC_PWM_PERIOD_NS
, 100);
635 pwm_config(panel
->backlight
.pwm
, duty_ns
, CRC_PMIC_PWM_PERIOD_NS
);
639 intel_panel_actually_set_backlight(struct intel_connector
*connector
, u32 level
)
641 struct intel_panel
*panel
= &connector
->panel
;
643 DRM_DEBUG_DRIVER("set backlight PWM = %d\n", level
);
645 level
= intel_panel_compute_brightness(connector
, level
);
646 panel
->backlight
.set(connector
, level
);
649 /* set backlight brightness to level in range [0..max], scaling wrt hw min */
650 static void intel_panel_set_backlight(struct intel_connector
*connector
,
651 u32 user_level
, u32 user_max
)
653 struct drm_i915_private
*dev_priv
= to_i915(connector
->base
.dev
);
654 struct intel_panel
*panel
= &connector
->panel
;
657 if (!panel
->backlight
.present
)
660 mutex_lock(&dev_priv
->backlight_lock
);
662 WARN_ON(panel
->backlight
.max
== 0);
664 hw_level
= scale_user_to_hw(connector
, user_level
, user_max
);
665 panel
->backlight
.level
= hw_level
;
667 if (panel
->backlight
.enabled
)
668 intel_panel_actually_set_backlight(connector
, hw_level
);
670 mutex_unlock(&dev_priv
->backlight_lock
);
673 /* set backlight brightness to level in range [0..max], assuming hw min is
676 void intel_panel_set_backlight_acpi(struct intel_connector
*connector
,
677 u32 user_level
, u32 user_max
)
679 struct drm_i915_private
*dev_priv
= to_i915(connector
->base
.dev
);
680 struct intel_panel
*panel
= &connector
->panel
;
681 enum pipe pipe
= intel_get_pipe_from_connector(connector
);
685 * INVALID_PIPE may occur during driver init because
686 * connection_mutex isn't held across the entire backlight
687 * setup + modeset readout, and the BIOS can issue the
688 * requests at any time.
690 if (!panel
->backlight
.present
|| pipe
== INVALID_PIPE
)
693 mutex_lock(&dev_priv
->backlight_lock
);
695 WARN_ON(panel
->backlight
.max
== 0);
697 hw_level
= clamp_user_to_hw(connector
, user_level
, user_max
);
698 panel
->backlight
.level
= hw_level
;
700 if (panel
->backlight
.device
)
701 panel
->backlight
.device
->props
.brightness
=
702 scale_hw_to_user(connector
,
703 panel
->backlight
.level
,
704 panel
->backlight
.device
->props
.max_brightness
);
706 if (panel
->backlight
.enabled
)
707 intel_panel_actually_set_backlight(connector
, hw_level
);
709 mutex_unlock(&dev_priv
->backlight_lock
);
712 static void lpt_disable_backlight(struct intel_connector
*connector
)
714 struct drm_i915_private
*dev_priv
= to_i915(connector
->base
.dev
);
717 intel_panel_actually_set_backlight(connector
, 0);
720 * Although we don't support or enable CPU PWM with LPT/SPT based
721 * systems, it may have been enabled prior to loading the
722 * driver. Disable to avoid warnings on LCPLL disable.
724 * This needs rework if we need to add support for CPU PWM on PCH split
727 tmp
= I915_READ(BLC_PWM_CPU_CTL2
);
728 if (tmp
& BLM_PWM_ENABLE
) {
729 DRM_DEBUG_KMS("cpu backlight was enabled, disabling\n");
730 I915_WRITE(BLC_PWM_CPU_CTL2
, tmp
& ~BLM_PWM_ENABLE
);
733 tmp
= I915_READ(BLC_PWM_PCH_CTL1
);
734 I915_WRITE(BLC_PWM_PCH_CTL1
, tmp
& ~BLM_PCH_PWM_ENABLE
);
737 static void pch_disable_backlight(struct intel_connector
*connector
)
739 struct drm_i915_private
*dev_priv
= to_i915(connector
->base
.dev
);
742 intel_panel_actually_set_backlight(connector
, 0);
744 tmp
= I915_READ(BLC_PWM_CPU_CTL2
);
745 I915_WRITE(BLC_PWM_CPU_CTL2
, tmp
& ~BLM_PWM_ENABLE
);
747 tmp
= I915_READ(BLC_PWM_PCH_CTL1
);
748 I915_WRITE(BLC_PWM_PCH_CTL1
, tmp
& ~BLM_PCH_PWM_ENABLE
);
751 static void i9xx_disable_backlight(struct intel_connector
*connector
)
753 intel_panel_actually_set_backlight(connector
, 0);
756 static void i965_disable_backlight(struct intel_connector
*connector
)
758 struct drm_i915_private
*dev_priv
= to_i915(connector
->base
.dev
);
761 intel_panel_actually_set_backlight(connector
, 0);
763 tmp
= I915_READ(BLC_PWM_CTL2
);
764 I915_WRITE(BLC_PWM_CTL2
, tmp
& ~BLM_PWM_ENABLE
);
767 static void vlv_disable_backlight(struct intel_connector
*connector
)
769 struct drm_i915_private
*dev_priv
= to_i915(connector
->base
.dev
);
770 enum pipe pipe
= intel_get_pipe_from_connector(connector
);
773 if (WARN_ON(pipe
!= PIPE_A
&& pipe
!= PIPE_B
))
776 intel_panel_actually_set_backlight(connector
, 0);
778 tmp
= I915_READ(VLV_BLC_PWM_CTL2(pipe
));
779 I915_WRITE(VLV_BLC_PWM_CTL2(pipe
), tmp
& ~BLM_PWM_ENABLE
);
782 static void bxt_disable_backlight(struct intel_connector
*connector
)
784 struct drm_i915_private
*dev_priv
= to_i915(connector
->base
.dev
);
785 struct intel_panel
*panel
= &connector
->panel
;
788 intel_panel_actually_set_backlight(connector
, 0);
790 tmp
= I915_READ(BXT_BLC_PWM_CTL(panel
->backlight
.controller
));
791 I915_WRITE(BXT_BLC_PWM_CTL(panel
->backlight
.controller
),
792 tmp
& ~BXT_BLC_PWM_ENABLE
);
794 if (panel
->backlight
.controller
== 1) {
795 val
= I915_READ(UTIL_PIN_CTL
);
796 val
&= ~UTIL_PIN_ENABLE
;
797 I915_WRITE(UTIL_PIN_CTL
, val
);
801 static void pwm_disable_backlight(struct intel_connector
*connector
)
803 struct intel_panel
*panel
= &connector
->panel
;
805 /* Disable the backlight */
806 pwm_config(panel
->backlight
.pwm
, 0, CRC_PMIC_PWM_PERIOD_NS
);
807 usleep_range(2000, 3000);
808 pwm_disable(panel
->backlight
.pwm
);
811 void intel_panel_disable_backlight(struct intel_connector
*connector
)
813 struct drm_i915_private
*dev_priv
= to_i915(connector
->base
.dev
);
814 struct intel_panel
*panel
= &connector
->panel
;
816 if (!panel
->backlight
.present
)
820 * Do not disable backlight on the vga_switcheroo path. When switching
821 * away from i915, the other client may depend on i915 to handle the
822 * backlight. This will leave the backlight on unnecessarily when
823 * another client is not activated.
825 if (dev_priv
->drm
.switch_power_state
== DRM_SWITCH_POWER_CHANGING
) {
826 DRM_DEBUG_DRIVER("Skipping backlight disable on vga switch\n");
830 mutex_lock(&dev_priv
->backlight_lock
);
832 if (panel
->backlight
.device
)
833 panel
->backlight
.device
->props
.power
= FB_BLANK_POWERDOWN
;
834 panel
->backlight
.enabled
= false;
835 panel
->backlight
.disable(connector
);
837 mutex_unlock(&dev_priv
->backlight_lock
);
840 static void lpt_enable_backlight(struct intel_connector
*connector
)
842 struct drm_i915_private
*dev_priv
= to_i915(connector
->base
.dev
);
843 struct intel_panel
*panel
= &connector
->panel
;
844 u32 pch_ctl1
, pch_ctl2
, schicken
;
846 pch_ctl1
= I915_READ(BLC_PWM_PCH_CTL1
);
847 if (pch_ctl1
& BLM_PCH_PWM_ENABLE
) {
848 DRM_DEBUG_KMS("pch backlight already enabled\n");
849 pch_ctl1
&= ~BLM_PCH_PWM_ENABLE
;
850 I915_WRITE(BLC_PWM_PCH_CTL1
, pch_ctl1
);
853 if (HAS_PCH_LPT(dev_priv
)) {
854 schicken
= I915_READ(SOUTH_CHICKEN2
);
855 if (panel
->backlight
.alternate_pwm_increment
)
856 schicken
|= LPT_PWM_GRANULARITY
;
858 schicken
&= ~LPT_PWM_GRANULARITY
;
859 I915_WRITE(SOUTH_CHICKEN2
, schicken
);
861 schicken
= I915_READ(SOUTH_CHICKEN1
);
862 if (panel
->backlight
.alternate_pwm_increment
)
863 schicken
|= SPT_PWM_GRANULARITY
;
865 schicken
&= ~SPT_PWM_GRANULARITY
;
866 I915_WRITE(SOUTH_CHICKEN1
, schicken
);
869 pch_ctl2
= panel
->backlight
.max
<< 16;
870 I915_WRITE(BLC_PWM_PCH_CTL2
, pch_ctl2
);
873 if (panel
->backlight
.active_low_pwm
)
874 pch_ctl1
|= BLM_PCH_POLARITY
;
876 /* After LPT, override is the default. */
877 if (HAS_PCH_LPT(dev_priv
))
878 pch_ctl1
|= BLM_PCH_OVERRIDE_ENABLE
;
880 I915_WRITE(BLC_PWM_PCH_CTL1
, pch_ctl1
);
881 POSTING_READ(BLC_PWM_PCH_CTL1
);
882 I915_WRITE(BLC_PWM_PCH_CTL1
, pch_ctl1
| BLM_PCH_PWM_ENABLE
);
884 /* This won't stick until the above enable. */
885 intel_panel_actually_set_backlight(connector
, panel
->backlight
.level
);
888 static void pch_enable_backlight(struct intel_connector
*connector
)
890 struct drm_i915_private
*dev_priv
= to_i915(connector
->base
.dev
);
891 struct intel_panel
*panel
= &connector
->panel
;
892 enum pipe pipe
= intel_get_pipe_from_connector(connector
);
893 enum transcoder cpu_transcoder
=
894 intel_pipe_to_cpu_transcoder(dev_priv
, pipe
);
895 u32 cpu_ctl2
, pch_ctl1
, pch_ctl2
;
897 cpu_ctl2
= I915_READ(BLC_PWM_CPU_CTL2
);
898 if (cpu_ctl2
& BLM_PWM_ENABLE
) {
899 DRM_DEBUG_KMS("cpu backlight already enabled\n");
900 cpu_ctl2
&= ~BLM_PWM_ENABLE
;
901 I915_WRITE(BLC_PWM_CPU_CTL2
, cpu_ctl2
);
904 pch_ctl1
= I915_READ(BLC_PWM_PCH_CTL1
);
905 if (pch_ctl1
& BLM_PCH_PWM_ENABLE
) {
906 DRM_DEBUG_KMS("pch backlight already enabled\n");
907 pch_ctl1
&= ~BLM_PCH_PWM_ENABLE
;
908 I915_WRITE(BLC_PWM_PCH_CTL1
, pch_ctl1
);
911 if (cpu_transcoder
== TRANSCODER_EDP
)
912 cpu_ctl2
= BLM_TRANSCODER_EDP
;
914 cpu_ctl2
= BLM_PIPE(cpu_transcoder
);
915 I915_WRITE(BLC_PWM_CPU_CTL2
, cpu_ctl2
);
916 POSTING_READ(BLC_PWM_CPU_CTL2
);
917 I915_WRITE(BLC_PWM_CPU_CTL2
, cpu_ctl2
| BLM_PWM_ENABLE
);
919 /* This won't stick until the above enable. */
920 intel_panel_actually_set_backlight(connector
, panel
->backlight
.level
);
922 pch_ctl2
= panel
->backlight
.max
<< 16;
923 I915_WRITE(BLC_PWM_PCH_CTL2
, pch_ctl2
);
926 if (panel
->backlight
.active_low_pwm
)
927 pch_ctl1
|= BLM_PCH_POLARITY
;
929 I915_WRITE(BLC_PWM_PCH_CTL1
, pch_ctl1
);
930 POSTING_READ(BLC_PWM_PCH_CTL1
);
931 I915_WRITE(BLC_PWM_PCH_CTL1
, pch_ctl1
| BLM_PCH_PWM_ENABLE
);
934 static void i9xx_enable_backlight(struct intel_connector
*connector
)
936 struct drm_i915_private
*dev_priv
= to_i915(connector
->base
.dev
);
937 struct intel_panel
*panel
= &connector
->panel
;
940 ctl
= I915_READ(BLC_PWM_CTL
);
941 if (ctl
& BACKLIGHT_DUTY_CYCLE_MASK_PNV
) {
942 DRM_DEBUG_KMS("backlight already enabled\n");
943 I915_WRITE(BLC_PWM_CTL
, 0);
946 freq
= panel
->backlight
.max
;
947 if (panel
->backlight
.combination_mode
)
951 if (panel
->backlight
.combination_mode
)
952 ctl
|= BLM_LEGACY_MODE
;
953 if (IS_PINEVIEW(dev_priv
) && panel
->backlight
.active_low_pwm
)
954 ctl
|= BLM_POLARITY_PNV
;
956 I915_WRITE(BLC_PWM_CTL
, ctl
);
957 POSTING_READ(BLC_PWM_CTL
);
959 /* XXX: combine this into above write? */
960 intel_panel_actually_set_backlight(connector
, panel
->backlight
.level
);
963 * Needed to enable backlight on some 855gm models. BLC_HIST_CTL is
964 * 855gm only, but checking for gen2 is safe, as 855gm is the only gen2
965 * that has backlight.
967 if (IS_GEN2(dev_priv
))
968 I915_WRITE(BLC_HIST_CTL
, BLM_HISTOGRAM_ENABLE
);
971 static void i965_enable_backlight(struct intel_connector
*connector
)
973 struct drm_i915_private
*dev_priv
= to_i915(connector
->base
.dev
);
974 struct intel_panel
*panel
= &connector
->panel
;
975 enum pipe pipe
= intel_get_pipe_from_connector(connector
);
978 ctl2
= I915_READ(BLC_PWM_CTL2
);
979 if (ctl2
& BLM_PWM_ENABLE
) {
980 DRM_DEBUG_KMS("backlight already enabled\n");
981 ctl2
&= ~BLM_PWM_ENABLE
;
982 I915_WRITE(BLC_PWM_CTL2
, ctl2
);
985 freq
= panel
->backlight
.max
;
986 if (panel
->backlight
.combination_mode
)
990 I915_WRITE(BLC_PWM_CTL
, ctl
);
992 ctl2
= BLM_PIPE(pipe
);
993 if (panel
->backlight
.combination_mode
)
994 ctl2
|= BLM_COMBINATION_MODE
;
995 if (panel
->backlight
.active_low_pwm
)
996 ctl2
|= BLM_POLARITY_I965
;
997 I915_WRITE(BLC_PWM_CTL2
, ctl2
);
998 POSTING_READ(BLC_PWM_CTL2
);
999 I915_WRITE(BLC_PWM_CTL2
, ctl2
| BLM_PWM_ENABLE
);
1001 intel_panel_actually_set_backlight(connector
, panel
->backlight
.level
);
1004 static void vlv_enable_backlight(struct intel_connector
*connector
)
1006 struct drm_i915_private
*dev_priv
= to_i915(connector
->base
.dev
);
1007 struct intel_panel
*panel
= &connector
->panel
;
1008 enum pipe pipe
= intel_get_pipe_from_connector(connector
);
1011 if (WARN_ON(pipe
!= PIPE_A
&& pipe
!= PIPE_B
))
1014 ctl2
= I915_READ(VLV_BLC_PWM_CTL2(pipe
));
1015 if (ctl2
& BLM_PWM_ENABLE
) {
1016 DRM_DEBUG_KMS("backlight already enabled\n");
1017 ctl2
&= ~BLM_PWM_ENABLE
;
1018 I915_WRITE(VLV_BLC_PWM_CTL2(pipe
), ctl2
);
1021 ctl
= panel
->backlight
.max
<< 16;
1022 I915_WRITE(VLV_BLC_PWM_CTL(pipe
), ctl
);
1024 /* XXX: combine this into above write? */
1025 intel_panel_actually_set_backlight(connector
, panel
->backlight
.level
);
1028 if (panel
->backlight
.active_low_pwm
)
1029 ctl2
|= BLM_POLARITY_I965
;
1030 I915_WRITE(VLV_BLC_PWM_CTL2(pipe
), ctl2
);
1031 POSTING_READ(VLV_BLC_PWM_CTL2(pipe
));
1032 I915_WRITE(VLV_BLC_PWM_CTL2(pipe
), ctl2
| BLM_PWM_ENABLE
);
1035 static void bxt_enable_backlight(struct intel_connector
*connector
)
1037 struct drm_i915_private
*dev_priv
= to_i915(connector
->base
.dev
);
1038 struct intel_panel
*panel
= &connector
->panel
;
1039 enum pipe pipe
= intel_get_pipe_from_connector(connector
);
1042 /* To use 2nd set of backlight registers, utility pin has to be
1043 * enabled with PWM mode.
1044 * The field should only be changed when the utility pin is disabled
1046 if (panel
->backlight
.controller
== 1) {
1047 val
= I915_READ(UTIL_PIN_CTL
);
1048 if (val
& UTIL_PIN_ENABLE
) {
1049 DRM_DEBUG_KMS("util pin already enabled\n");
1050 val
&= ~UTIL_PIN_ENABLE
;
1051 I915_WRITE(UTIL_PIN_CTL
, val
);
1055 if (panel
->backlight
.util_pin_active_low
)
1056 val
|= UTIL_PIN_POLARITY
;
1057 I915_WRITE(UTIL_PIN_CTL
, val
| UTIL_PIN_PIPE(pipe
) |
1058 UTIL_PIN_MODE_PWM
| UTIL_PIN_ENABLE
);
1061 pwm_ctl
= I915_READ(BXT_BLC_PWM_CTL(panel
->backlight
.controller
));
1062 if (pwm_ctl
& BXT_BLC_PWM_ENABLE
) {
1063 DRM_DEBUG_KMS("backlight already enabled\n");
1064 pwm_ctl
&= ~BXT_BLC_PWM_ENABLE
;
1065 I915_WRITE(BXT_BLC_PWM_CTL(panel
->backlight
.controller
),
1069 I915_WRITE(BXT_BLC_PWM_FREQ(panel
->backlight
.controller
),
1070 panel
->backlight
.max
);
1072 intel_panel_actually_set_backlight(connector
, panel
->backlight
.level
);
1075 if (panel
->backlight
.active_low_pwm
)
1076 pwm_ctl
|= BXT_BLC_PWM_POLARITY
;
1078 I915_WRITE(BXT_BLC_PWM_CTL(panel
->backlight
.controller
), pwm_ctl
);
1079 POSTING_READ(BXT_BLC_PWM_CTL(panel
->backlight
.controller
));
1080 I915_WRITE(BXT_BLC_PWM_CTL(panel
->backlight
.controller
),
1081 pwm_ctl
| BXT_BLC_PWM_ENABLE
);
1084 static void pwm_enable_backlight(struct intel_connector
*connector
)
1086 struct intel_panel
*panel
= &connector
->panel
;
1088 pwm_enable(panel
->backlight
.pwm
);
1089 intel_panel_actually_set_backlight(connector
, panel
->backlight
.level
);
1092 void intel_panel_enable_backlight(struct intel_connector
*connector
)
1094 struct drm_i915_private
*dev_priv
= to_i915(connector
->base
.dev
);
1095 struct intel_panel
*panel
= &connector
->panel
;
1096 enum pipe pipe
= intel_get_pipe_from_connector(connector
);
1098 if (!panel
->backlight
.present
)
1101 DRM_DEBUG_KMS("pipe %c\n", pipe_name(pipe
));
1103 mutex_lock(&dev_priv
->backlight_lock
);
1105 WARN_ON(panel
->backlight
.max
== 0);
1107 if (panel
->backlight
.level
<= panel
->backlight
.min
) {
1108 panel
->backlight
.level
= panel
->backlight
.max
;
1109 if (panel
->backlight
.device
)
1110 panel
->backlight
.device
->props
.brightness
=
1111 scale_hw_to_user(connector
,
1112 panel
->backlight
.level
,
1113 panel
->backlight
.device
->props
.max_brightness
);
1116 panel
->backlight
.enable(connector
);
1117 panel
->backlight
.enabled
= true;
1118 if (panel
->backlight
.device
)
1119 panel
->backlight
.device
->props
.power
= FB_BLANK_UNBLANK
;
1121 mutex_unlock(&dev_priv
->backlight_lock
);
1124 #if IS_ENABLED(CONFIG_BACKLIGHT_CLASS_DEVICE)
1125 static int intel_backlight_device_update_status(struct backlight_device
*bd
)
1127 struct intel_connector
*connector
= bl_get_data(bd
);
1128 struct intel_panel
*panel
= &connector
->panel
;
1129 struct drm_device
*dev
= connector
->base
.dev
;
1131 drm_modeset_lock(&dev
->mode_config
.connection_mutex
, NULL
);
1132 DRM_DEBUG_KMS("updating intel_backlight, brightness=%d/%d\n",
1133 bd
->props
.brightness
, bd
->props
.max_brightness
);
1134 intel_panel_set_backlight(connector
, bd
->props
.brightness
,
1135 bd
->props
.max_brightness
);
1138 * Allow flipping bl_power as a sub-state of enabled. Sadly the
1139 * backlight class device does not make it easy to to differentiate
1140 * between callbacks for brightness and bl_power, so our backlight_power
1141 * callback needs to take this into account.
1143 if (panel
->backlight
.enabled
) {
1144 if (panel
->backlight
.power
) {
1145 bool enable
= bd
->props
.power
== FB_BLANK_UNBLANK
&&
1146 bd
->props
.brightness
!= 0;
1147 panel
->backlight
.power(connector
, enable
);
1150 bd
->props
.power
= FB_BLANK_POWERDOWN
;
1153 drm_modeset_unlock(&dev
->mode_config
.connection_mutex
);
1157 static int intel_backlight_device_get_brightness(struct backlight_device
*bd
)
1159 struct intel_connector
*connector
= bl_get_data(bd
);
1160 struct drm_device
*dev
= connector
->base
.dev
;
1161 struct drm_i915_private
*dev_priv
= to_i915(dev
);
1165 intel_runtime_pm_get(dev_priv
);
1166 drm_modeset_lock(&dev
->mode_config
.connection_mutex
, NULL
);
1168 hw_level
= intel_panel_get_backlight(connector
);
1169 ret
= scale_hw_to_user(connector
, hw_level
, bd
->props
.max_brightness
);
1171 drm_modeset_unlock(&dev
->mode_config
.connection_mutex
);
1172 intel_runtime_pm_put(dev_priv
);
1177 static const struct backlight_ops intel_backlight_device_ops
= {
1178 .update_status
= intel_backlight_device_update_status
,
1179 .get_brightness
= intel_backlight_device_get_brightness
,
1182 int intel_backlight_device_register(struct intel_connector
*connector
)
1184 struct intel_panel
*panel
= &connector
->panel
;
1185 struct backlight_properties props
;
1187 if (WARN_ON(panel
->backlight
.device
))
1190 if (!panel
->backlight
.present
)
1193 WARN_ON(panel
->backlight
.max
== 0);
1195 memset(&props
, 0, sizeof(props
));
1196 props
.type
= BACKLIGHT_RAW
;
1199 * Note: Everything should work even if the backlight device max
1200 * presented to the userspace is arbitrarily chosen.
1202 props
.max_brightness
= panel
->backlight
.max
;
1203 props
.brightness
= scale_hw_to_user(connector
,
1204 panel
->backlight
.level
,
1205 props
.max_brightness
);
1207 if (panel
->backlight
.enabled
)
1208 props
.power
= FB_BLANK_UNBLANK
;
1210 props
.power
= FB_BLANK_POWERDOWN
;
1213 * Note: using the same name independent of the connector prevents
1214 * registration of multiple backlight devices in the driver.
1216 panel
->backlight
.device
=
1217 backlight_device_register("intel_backlight",
1218 connector
->base
.kdev
,
1220 &intel_backlight_device_ops
, &props
);
1222 if (IS_ERR(panel
->backlight
.device
)) {
1223 DRM_ERROR("Failed to register backlight: %ld\n",
1224 PTR_ERR(panel
->backlight
.device
));
1225 panel
->backlight
.device
= NULL
;
1229 DRM_DEBUG_KMS("Connector %s backlight sysfs interface registered\n",
1230 connector
->base
.name
);
1235 void intel_backlight_device_unregister(struct intel_connector
*connector
)
1237 struct intel_panel
*panel
= &connector
->panel
;
1239 if (panel
->backlight
.device
) {
1240 backlight_device_unregister(panel
->backlight
.device
);
1241 panel
->backlight
.device
= NULL
;
1244 #endif /* CONFIG_BACKLIGHT_CLASS_DEVICE */
1247 * BXT: PWM clock frequency = 19.2 MHz.
1249 static u32
bxt_hz_to_pwm(struct intel_connector
*connector
, u32 pwm_freq_hz
)
1251 return DIV_ROUND_CLOSEST(KHz(19200), pwm_freq_hz
);
1255 * SPT: This value represents the period of the PWM stream in clock periods
1256 * multiplied by 16 (default increment) or 128 (alternate increment selected in
1257 * SCHICKEN_1 bit 0). PWM clock is 24 MHz.
1259 static u32
spt_hz_to_pwm(struct intel_connector
*connector
, u32 pwm_freq_hz
)
1261 struct intel_panel
*panel
= &connector
->panel
;
1264 if (panel
->backlight
.alternate_pwm_increment
)
1269 return DIV_ROUND_CLOSEST(MHz(24), pwm_freq_hz
* mul
);
1273 * LPT: This value represents the period of the PWM stream in clock periods
1274 * multiplied by 128 (default increment) or 16 (alternate increment, selected in
1275 * LPT SOUTH_CHICKEN2 register bit 5).
1277 static u32
lpt_hz_to_pwm(struct intel_connector
*connector
, u32 pwm_freq_hz
)
1279 struct drm_i915_private
*dev_priv
= to_i915(connector
->base
.dev
);
1280 struct intel_panel
*panel
= &connector
->panel
;
1283 if (panel
->backlight
.alternate_pwm_increment
)
1288 if (HAS_PCH_LPT_H(dev_priv
))
1289 clock
= MHz(135); /* LPT:H */
1291 clock
= MHz(24); /* LPT:LP */
1293 return DIV_ROUND_CLOSEST(clock
, pwm_freq_hz
* mul
);
1297 * ILK/SNB/IVB: This value represents the period of the PWM stream in PCH
1298 * display raw clocks multiplied by 128.
1300 static u32
pch_hz_to_pwm(struct intel_connector
*connector
, u32 pwm_freq_hz
)
1302 struct drm_i915_private
*dev_priv
= to_i915(connector
->base
.dev
);
1304 return DIV_ROUND_CLOSEST(KHz(dev_priv
->rawclk_freq
), pwm_freq_hz
* 128);
1308 * Gen2: This field determines the number of time base events (display core
1309 * clock frequency/32) in total for a complete cycle of modulated backlight
1312 * Gen3: A time base event equals the display core clock ([DevPNV] HRAW clock)
1315 static u32
i9xx_hz_to_pwm(struct intel_connector
*connector
, u32 pwm_freq_hz
)
1317 struct drm_i915_private
*dev_priv
= to_i915(connector
->base
.dev
);
1320 if (IS_PINEVIEW(dev_priv
))
1321 clock
= KHz(dev_priv
->rawclk_freq
);
1323 clock
= KHz(dev_priv
->cdclk_freq
);
1325 return DIV_ROUND_CLOSEST(clock
, pwm_freq_hz
* 32);
1329 * Gen4: This value represents the period of the PWM stream in display core
1330 * clocks ([DevCTG] HRAW clocks) multiplied by 128.
1333 static u32
i965_hz_to_pwm(struct intel_connector
*connector
, u32 pwm_freq_hz
)
1335 struct drm_device
*dev
= connector
->base
.dev
;
1336 struct drm_i915_private
*dev_priv
= to_i915(dev
);
1339 if (IS_G4X(dev_priv
))
1340 clock
= KHz(dev_priv
->rawclk_freq
);
1342 clock
= KHz(dev_priv
->cdclk_freq
);
1344 return DIV_ROUND_CLOSEST(clock
, pwm_freq_hz
* 128);
1348 * VLV: This value represents the period of the PWM stream in display core
1349 * clocks ([DevCTG] 200MHz HRAW clocks) multiplied by 128 or 25MHz S0IX clocks
1350 * multiplied by 16. CHV uses a 19.2MHz S0IX clock.
1352 static u32
vlv_hz_to_pwm(struct intel_connector
*connector
, u32 pwm_freq_hz
)
1354 struct drm_i915_private
*dev_priv
= to_i915(connector
->base
.dev
);
1357 if ((I915_READ(CBR1_VLV
) & CBR_PWM_CLOCK_MUX_SELECT
) == 0) {
1358 if (IS_CHERRYVIEW(dev_priv
))
1364 clock
= KHz(dev_priv
->rawclk_freq
);
1368 return DIV_ROUND_CLOSEST(clock
, pwm_freq_hz
* mul
);
1371 static u32
get_backlight_max_vbt(struct intel_connector
*connector
)
1373 struct drm_i915_private
*dev_priv
= to_i915(connector
->base
.dev
);
1374 struct intel_panel
*panel
= &connector
->panel
;
1375 u16 pwm_freq_hz
= dev_priv
->vbt
.backlight
.pwm_freq_hz
;
1378 if (!panel
->backlight
.hz_to_pwm
) {
1379 DRM_DEBUG_KMS("backlight frequency conversion not supported\n");
1384 DRM_DEBUG_KMS("VBT defined backlight frequency %u Hz\n",
1388 DRM_DEBUG_KMS("default backlight frequency %u Hz\n",
1392 pwm
= panel
->backlight
.hz_to_pwm(connector
, pwm_freq_hz
);
1394 DRM_DEBUG_KMS("backlight frequency conversion failed\n");
1402 * Note: The setup hooks can't assume pipe is set!
1404 static u32
get_backlight_min_vbt(struct intel_connector
*connector
)
1406 struct drm_i915_private
*dev_priv
= to_i915(connector
->base
.dev
);
1407 struct intel_panel
*panel
= &connector
->panel
;
1410 WARN_ON(panel
->backlight
.max
== 0);
1413 * XXX: If the vbt value is 255, it makes min equal to max, which leads
1414 * to problems. There are such machines out there. Either our
1415 * interpretation is wrong or the vbt has bogus data. Or both. Safeguard
1416 * against this by letting the minimum be at most (arbitrarily chosen)
1419 min
= clamp_t(int, dev_priv
->vbt
.backlight
.min_brightness
, 0, 64);
1420 if (min
!= dev_priv
->vbt
.backlight
.min_brightness
) {
1421 DRM_DEBUG_KMS("clamping VBT min backlight %d/255 to %d/255\n",
1422 dev_priv
->vbt
.backlight
.min_brightness
, min
);
1425 /* vbt value is a coefficient in range [0..255] */
1426 return scale(min
, 0, 255, 0, panel
->backlight
.max
);
1429 static int lpt_setup_backlight(struct intel_connector
*connector
, enum pipe unused
)
1431 struct drm_i915_private
*dev_priv
= to_i915(connector
->base
.dev
);
1432 struct intel_panel
*panel
= &connector
->panel
;
1433 u32 pch_ctl1
, pch_ctl2
, val
;
1436 if (HAS_PCH_LPT(dev_priv
))
1437 alt
= I915_READ(SOUTH_CHICKEN2
) & LPT_PWM_GRANULARITY
;
1439 alt
= I915_READ(SOUTH_CHICKEN1
) & SPT_PWM_GRANULARITY
;
1440 panel
->backlight
.alternate_pwm_increment
= alt
;
1442 pch_ctl1
= I915_READ(BLC_PWM_PCH_CTL1
);
1443 panel
->backlight
.active_low_pwm
= pch_ctl1
& BLM_PCH_POLARITY
;
1445 pch_ctl2
= I915_READ(BLC_PWM_PCH_CTL2
);
1446 panel
->backlight
.max
= pch_ctl2
>> 16;
1448 if (!panel
->backlight
.max
)
1449 panel
->backlight
.max
= get_backlight_max_vbt(connector
);
1451 if (!panel
->backlight
.max
)
1454 panel
->backlight
.min
= get_backlight_min_vbt(connector
);
1456 val
= lpt_get_backlight(connector
);
1457 val
= intel_panel_compute_brightness(connector
, val
);
1458 panel
->backlight
.level
= clamp(val
, panel
->backlight
.min
,
1459 panel
->backlight
.max
);
1461 panel
->backlight
.enabled
= pch_ctl1
& BLM_PCH_PWM_ENABLE
;
1466 static int pch_setup_backlight(struct intel_connector
*connector
, enum pipe unused
)
1468 struct drm_i915_private
*dev_priv
= to_i915(connector
->base
.dev
);
1469 struct intel_panel
*panel
= &connector
->panel
;
1470 u32 cpu_ctl2
, pch_ctl1
, pch_ctl2
, val
;
1472 pch_ctl1
= I915_READ(BLC_PWM_PCH_CTL1
);
1473 panel
->backlight
.active_low_pwm
= pch_ctl1
& BLM_PCH_POLARITY
;
1475 pch_ctl2
= I915_READ(BLC_PWM_PCH_CTL2
);
1476 panel
->backlight
.max
= pch_ctl2
>> 16;
1478 if (!panel
->backlight
.max
)
1479 panel
->backlight
.max
= get_backlight_max_vbt(connector
);
1481 if (!panel
->backlight
.max
)
1484 panel
->backlight
.min
= get_backlight_min_vbt(connector
);
1486 val
= pch_get_backlight(connector
);
1487 val
= intel_panel_compute_brightness(connector
, val
);
1488 panel
->backlight
.level
= clamp(val
, panel
->backlight
.min
,
1489 panel
->backlight
.max
);
1491 cpu_ctl2
= I915_READ(BLC_PWM_CPU_CTL2
);
1492 panel
->backlight
.enabled
= (cpu_ctl2
& BLM_PWM_ENABLE
) &&
1493 (pch_ctl1
& BLM_PCH_PWM_ENABLE
);
1498 static int i9xx_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
;
1504 ctl
= I915_READ(BLC_PWM_CTL
);
1506 if (IS_GEN2(dev_priv
) || IS_I915GM(dev_priv
) || IS_I945GM(dev_priv
))
1507 panel
->backlight
.combination_mode
= ctl
& BLM_LEGACY_MODE
;
1509 if (IS_PINEVIEW(dev_priv
))
1510 panel
->backlight
.active_low_pwm
= ctl
& BLM_POLARITY_PNV
;
1512 panel
->backlight
.max
= ctl
>> 17;
1514 if (!panel
->backlight
.max
) {
1515 panel
->backlight
.max
= get_backlight_max_vbt(connector
);
1516 panel
->backlight
.max
>>= 1;
1519 if (!panel
->backlight
.max
)
1522 if (panel
->backlight
.combination_mode
)
1523 panel
->backlight
.max
*= 0xff;
1525 panel
->backlight
.min
= get_backlight_min_vbt(connector
);
1527 val
= i9xx_get_backlight(connector
);
1528 val
= intel_panel_compute_brightness(connector
, val
);
1529 panel
->backlight
.level
= clamp(val
, panel
->backlight
.min
,
1530 panel
->backlight
.max
);
1532 panel
->backlight
.enabled
= val
!= 0;
1537 static int i965_setup_backlight(struct intel_connector
*connector
, enum pipe unused
)
1539 struct drm_i915_private
*dev_priv
= to_i915(connector
->base
.dev
);
1540 struct intel_panel
*panel
= &connector
->panel
;
1543 ctl2
= I915_READ(BLC_PWM_CTL2
);
1544 panel
->backlight
.combination_mode
= ctl2
& BLM_COMBINATION_MODE
;
1545 panel
->backlight
.active_low_pwm
= ctl2
& BLM_POLARITY_I965
;
1547 ctl
= I915_READ(BLC_PWM_CTL
);
1548 panel
->backlight
.max
= ctl
>> 16;
1550 if (!panel
->backlight
.max
)
1551 panel
->backlight
.max
= get_backlight_max_vbt(connector
);
1553 if (!panel
->backlight
.max
)
1556 if (panel
->backlight
.combination_mode
)
1557 panel
->backlight
.max
*= 0xff;
1559 panel
->backlight
.min
= get_backlight_min_vbt(connector
);
1561 val
= i9xx_get_backlight(connector
);
1562 val
= intel_panel_compute_brightness(connector
, val
);
1563 panel
->backlight
.level
= clamp(val
, panel
->backlight
.min
,
1564 panel
->backlight
.max
);
1566 panel
->backlight
.enabled
= ctl2
& BLM_PWM_ENABLE
;
1571 static int vlv_setup_backlight(struct intel_connector
*connector
, enum pipe pipe
)
1573 struct drm_i915_private
*dev_priv
= to_i915(connector
->base
.dev
);
1574 struct intel_panel
*panel
= &connector
->panel
;
1577 if (WARN_ON(pipe
!= PIPE_A
&& pipe
!= PIPE_B
))
1580 ctl2
= I915_READ(VLV_BLC_PWM_CTL2(pipe
));
1581 panel
->backlight
.active_low_pwm
= ctl2
& BLM_POLARITY_I965
;
1583 ctl
= I915_READ(VLV_BLC_PWM_CTL(pipe
));
1584 panel
->backlight
.max
= ctl
>> 16;
1586 if (!panel
->backlight
.max
)
1587 panel
->backlight
.max
= get_backlight_max_vbt(connector
);
1589 if (!panel
->backlight
.max
)
1592 panel
->backlight
.min
= get_backlight_min_vbt(connector
);
1594 val
= _vlv_get_backlight(dev_priv
, pipe
);
1595 val
= intel_panel_compute_brightness(connector
, val
);
1596 panel
->backlight
.level
= clamp(val
, panel
->backlight
.min
,
1597 panel
->backlight
.max
);
1599 panel
->backlight
.enabled
= ctl2
& BLM_PWM_ENABLE
;
1605 bxt_setup_backlight(struct intel_connector
*connector
, enum pipe unused
)
1607 struct drm_i915_private
*dev_priv
= to_i915(connector
->base
.dev
);
1608 struct intel_panel
*panel
= &connector
->panel
;
1612 * For BXT hard coding the Backlight controller to 0.
1613 * TODO : Read the controller value from VBT and generalize
1615 panel
->backlight
.controller
= 0;
1617 pwm_ctl
= I915_READ(BXT_BLC_PWM_CTL(panel
->backlight
.controller
));
1619 /* Keeping the check if controller 1 is to be programmed.
1620 * This will come into affect once the VBT parsing
1621 * is fixed for controller selection, and controller 1 is used
1622 * for a prticular display configuration.
1624 if (panel
->backlight
.controller
== 1) {
1625 val
= I915_READ(UTIL_PIN_CTL
);
1626 panel
->backlight
.util_pin_active_low
=
1627 val
& UTIL_PIN_POLARITY
;
1630 panel
->backlight
.active_low_pwm
= pwm_ctl
& BXT_BLC_PWM_POLARITY
;
1631 panel
->backlight
.max
=
1632 I915_READ(BXT_BLC_PWM_FREQ(panel
->backlight
.controller
));
1634 if (!panel
->backlight
.max
)
1635 panel
->backlight
.max
= get_backlight_max_vbt(connector
);
1637 if (!panel
->backlight
.max
)
1640 val
= bxt_get_backlight(connector
);
1641 val
= intel_panel_compute_brightness(connector
, val
);
1642 panel
->backlight
.level
= clamp(val
, panel
->backlight
.min
,
1643 panel
->backlight
.max
);
1645 panel
->backlight
.enabled
= pwm_ctl
& BXT_BLC_PWM_ENABLE
;
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
;
1666 * FIXME: pwm_apply_args() should be removed when switching to
1667 * the atomic PWM API.
1669 pwm_apply_args(panel
->backlight
.pwm
);
1671 retval
= pwm_config(panel
->backlight
.pwm
, CRC_PMIC_PWM_PERIOD_NS
,
1672 CRC_PMIC_PWM_PERIOD_NS
);
1674 DRM_ERROR("Failed to configure the pwm chip\n");
1675 pwm_put(panel
->backlight
.pwm
);
1676 panel
->backlight
.pwm
= NULL
;
1680 panel
->backlight
.min
= 0; /* 0% */
1681 panel
->backlight
.max
= 100; /* 100% */
1682 panel
->backlight
.level
= DIV_ROUND_UP(
1683 pwm_get_duty_cycle(panel
->backlight
.pwm
) * 100,
1684 CRC_PMIC_PWM_PERIOD_NS
);
1685 panel
->backlight
.enabled
= panel
->backlight
.level
!= 0;
1690 int intel_panel_setup_backlight(struct drm_connector
*connector
, enum pipe pipe
)
1692 struct drm_i915_private
*dev_priv
= to_i915(connector
->dev
);
1693 struct intel_connector
*intel_connector
= to_intel_connector(connector
);
1694 struct intel_panel
*panel
= &intel_connector
->panel
;
1697 if (!dev_priv
->vbt
.backlight
.present
) {
1698 if (dev_priv
->quirks
& QUIRK_BACKLIGHT_PRESENT
) {
1699 DRM_DEBUG_KMS("no backlight present per VBT, but present per quirk\n");
1701 DRM_DEBUG_KMS("no backlight present per VBT\n");
1706 /* ensure intel_panel has been initialized first */
1707 if (WARN_ON(!panel
->backlight
.setup
))
1710 /* set level and max in panel struct */
1711 mutex_lock(&dev_priv
->backlight_lock
);
1712 ret
= panel
->backlight
.setup(intel_connector
, pipe
);
1713 mutex_unlock(&dev_priv
->backlight_lock
);
1716 DRM_DEBUG_KMS("failed to setup backlight for connector %s\n",
1721 panel
->backlight
.present
= true;
1723 DRM_DEBUG_KMS("Connector %s backlight initialized, %s, brightness %u/%u\n",
1725 panel
->backlight
.enabled
? "enabled" : "disabled",
1726 panel
->backlight
.level
, panel
->backlight
.max
);
1731 void intel_panel_destroy_backlight(struct drm_connector
*connector
)
1733 struct intel_connector
*intel_connector
= to_intel_connector(connector
);
1734 struct intel_panel
*panel
= &intel_connector
->panel
;
1736 /* dispose of the pwm */
1737 if (panel
->backlight
.pwm
)
1738 pwm_put(panel
->backlight
.pwm
);
1740 panel
->backlight
.present
= false;
1743 /* Set up chip specific backlight functions */
1745 intel_panel_init_backlight_funcs(struct intel_panel
*panel
)
1747 struct intel_connector
*connector
=
1748 container_of(panel
, struct intel_connector
, panel
);
1749 struct drm_i915_private
*dev_priv
= to_i915(connector
->base
.dev
);
1751 if (connector
->base
.connector_type
== DRM_MODE_CONNECTOR_eDP
&&
1752 intel_dp_aux_init_backlight_funcs(connector
) == 0)
1755 if (connector
->base
.connector_type
== DRM_MODE_CONNECTOR_DSI
&&
1756 intel_dsi_dcs_init_backlight_funcs(connector
) == 0)
1759 if (IS_BROXTON(dev_priv
)) {
1760 panel
->backlight
.setup
= bxt_setup_backlight
;
1761 panel
->backlight
.enable
= bxt_enable_backlight
;
1762 panel
->backlight
.disable
= bxt_disable_backlight
;
1763 panel
->backlight
.set
= bxt_set_backlight
;
1764 panel
->backlight
.get
= bxt_get_backlight
;
1765 panel
->backlight
.hz_to_pwm
= bxt_hz_to_pwm
;
1766 } else if (HAS_PCH_LPT(dev_priv
) || HAS_PCH_SPT(dev_priv
) ||
1767 HAS_PCH_KBP(dev_priv
)) {
1768 panel
->backlight
.setup
= lpt_setup_backlight
;
1769 panel
->backlight
.enable
= lpt_enable_backlight
;
1770 panel
->backlight
.disable
= lpt_disable_backlight
;
1771 panel
->backlight
.set
= lpt_set_backlight
;
1772 panel
->backlight
.get
= lpt_get_backlight
;
1773 if (HAS_PCH_LPT(dev_priv
))
1774 panel
->backlight
.hz_to_pwm
= lpt_hz_to_pwm
;
1776 panel
->backlight
.hz_to_pwm
= spt_hz_to_pwm
;
1777 } else if (HAS_PCH_SPLIT(dev_priv
)) {
1778 panel
->backlight
.setup
= pch_setup_backlight
;
1779 panel
->backlight
.enable
= pch_enable_backlight
;
1780 panel
->backlight
.disable
= pch_disable_backlight
;
1781 panel
->backlight
.set
= pch_set_backlight
;
1782 panel
->backlight
.get
= pch_get_backlight
;
1783 panel
->backlight
.hz_to_pwm
= pch_hz_to_pwm
;
1784 } else if (IS_VALLEYVIEW(dev_priv
) || IS_CHERRYVIEW(dev_priv
)) {
1785 if (connector
->base
.connector_type
== DRM_MODE_CONNECTOR_DSI
) {
1786 panel
->backlight
.setup
= pwm_setup_backlight
;
1787 panel
->backlight
.enable
= pwm_enable_backlight
;
1788 panel
->backlight
.disable
= pwm_disable_backlight
;
1789 panel
->backlight
.set
= pwm_set_backlight
;
1790 panel
->backlight
.get
= pwm_get_backlight
;
1792 panel
->backlight
.setup
= vlv_setup_backlight
;
1793 panel
->backlight
.enable
= vlv_enable_backlight
;
1794 panel
->backlight
.disable
= vlv_disable_backlight
;
1795 panel
->backlight
.set
= vlv_set_backlight
;
1796 panel
->backlight
.get
= vlv_get_backlight
;
1797 panel
->backlight
.hz_to_pwm
= vlv_hz_to_pwm
;
1799 } else if (IS_GEN4(dev_priv
)) {
1800 panel
->backlight
.setup
= i965_setup_backlight
;
1801 panel
->backlight
.enable
= i965_enable_backlight
;
1802 panel
->backlight
.disable
= i965_disable_backlight
;
1803 panel
->backlight
.set
= i9xx_set_backlight
;
1804 panel
->backlight
.get
= i9xx_get_backlight
;
1805 panel
->backlight
.hz_to_pwm
= i965_hz_to_pwm
;
1807 panel
->backlight
.setup
= i9xx_setup_backlight
;
1808 panel
->backlight
.enable
= i9xx_enable_backlight
;
1809 panel
->backlight
.disable
= i9xx_disable_backlight
;
1810 panel
->backlight
.set
= i9xx_set_backlight
;
1811 panel
->backlight
.get
= i9xx_get_backlight
;
1812 panel
->backlight
.hz_to_pwm
= i9xx_hz_to_pwm
;
1816 int intel_panel_init(struct intel_panel
*panel
,
1817 struct drm_display_mode
*fixed_mode
,
1818 struct drm_display_mode
*downclock_mode
)
1820 intel_panel_init_backlight_funcs(panel
);
1822 panel
->fixed_mode
= fixed_mode
;
1823 panel
->downclock_mode
= downclock_mode
;
1828 void intel_panel_fini(struct intel_panel
*panel
)
1830 struct intel_connector
*intel_connector
=
1831 container_of(panel
, struct intel_connector
, panel
);
1833 if (panel
->fixed_mode
)
1834 drm_mode_destroy(intel_connector
->base
.dev
, panel
->fixed_mode
);
1836 if (panel
->downclock_mode
)
1837 drm_mode_destroy(intel_connector
->base
.dev
,
1838 panel
->downclock_mode
);