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/moduleparam.h>
34 #include "intel_drv.h"
36 #define PCI_LBPC 0xf4 /* legacy/combination backlight modes */
39 intel_fixed_panel_mode(struct drm_display_mode
*fixed_mode
,
40 struct drm_display_mode
*adjusted_mode
)
42 adjusted_mode
->hdisplay
= fixed_mode
->hdisplay
;
43 adjusted_mode
->hsync_start
= fixed_mode
->hsync_start
;
44 adjusted_mode
->hsync_end
= fixed_mode
->hsync_end
;
45 adjusted_mode
->htotal
= fixed_mode
->htotal
;
47 adjusted_mode
->vdisplay
= fixed_mode
->vdisplay
;
48 adjusted_mode
->vsync_start
= fixed_mode
->vsync_start
;
49 adjusted_mode
->vsync_end
= fixed_mode
->vsync_end
;
50 adjusted_mode
->vtotal
= fixed_mode
->vtotal
;
52 adjusted_mode
->clock
= fixed_mode
->clock
;
55 /* adjusted_mode has been preset to be the panel's fixed mode */
57 intel_pch_panel_fitting(struct drm_device
*dev
,
59 const struct drm_display_mode
*mode
,
60 struct drm_display_mode
*adjusted_mode
)
62 struct drm_i915_private
*dev_priv
= dev
->dev_private
;
63 int x
, y
, width
, height
;
65 x
= y
= width
= height
= 0;
67 /* Native modes don't need fitting */
68 if (adjusted_mode
->hdisplay
== mode
->hdisplay
&&
69 adjusted_mode
->vdisplay
== mode
->vdisplay
)
72 switch (fitting_mode
) {
73 case DRM_MODE_SCALE_CENTER
:
74 width
= mode
->hdisplay
;
75 height
= mode
->vdisplay
;
76 x
= (adjusted_mode
->hdisplay
- width
+ 1)/2;
77 y
= (adjusted_mode
->vdisplay
- height
+ 1)/2;
80 case DRM_MODE_SCALE_ASPECT
:
81 /* Scale but preserve the aspect ratio */
83 u32 scaled_width
= adjusted_mode
->hdisplay
* mode
->vdisplay
;
84 u32 scaled_height
= mode
->hdisplay
* adjusted_mode
->vdisplay
;
85 if (scaled_width
> scaled_height
) { /* pillar */
86 width
= scaled_height
/ mode
->vdisplay
;
89 x
= (adjusted_mode
->hdisplay
- width
+ 1) / 2;
91 height
= adjusted_mode
->vdisplay
;
92 } else if (scaled_width
< scaled_height
) { /* letter */
93 height
= scaled_width
/ mode
->hdisplay
;
96 y
= (adjusted_mode
->vdisplay
- height
+ 1) / 2;
98 width
= adjusted_mode
->hdisplay
;
101 width
= adjusted_mode
->hdisplay
;
102 height
= adjusted_mode
->vdisplay
;
108 case DRM_MODE_SCALE_FULLSCREEN
:
110 width
= adjusted_mode
->hdisplay
;
111 height
= adjusted_mode
->vdisplay
;
116 dev_priv
->pch_pf_pos
= (x
<< 16) | y
;
117 dev_priv
->pch_pf_size
= (width
<< 16) | height
;
120 static int is_backlight_combination_mode(struct drm_device
*dev
)
122 struct drm_i915_private
*dev_priv
= dev
->dev_private
;
124 if (INTEL_INFO(dev
)->gen
>= 4)
125 return I915_READ(BLC_PWM_CTL2
) & BLM_COMBINATION_MODE
;
128 return I915_READ(BLC_PWM_CTL
) & BLM_LEGACY_MODE
;
133 static u32
i915_read_blc_pwm_ctl(struct drm_device
*dev
)
135 struct drm_i915_private
*dev_priv
= dev
->dev_private
;
138 /* Restore the CTL value if it lost, e.g. GPU reset */
140 if (HAS_PCH_SPLIT(dev_priv
->dev
)) {
141 val
= I915_READ(BLC_PWM_PCH_CTL2
);
142 if (dev_priv
->regfile
.saveBLC_PWM_CTL2
== 0) {
143 dev_priv
->regfile
.saveBLC_PWM_CTL2
= val
;
144 } else if (val
== 0) {
145 val
= dev_priv
->regfile
.saveBLC_PWM_CTL2
;
146 I915_WRITE(BLC_PWM_PCH_CTL2
, val
);
149 val
= I915_READ(BLC_PWM_CTL
);
150 if (dev_priv
->regfile
.saveBLC_PWM_CTL
== 0) {
151 dev_priv
->regfile
.saveBLC_PWM_CTL
= val
;
152 if (INTEL_INFO(dev
)->gen
>= 4)
153 dev_priv
->regfile
.saveBLC_PWM_CTL2
=
154 I915_READ(BLC_PWM_CTL2
);
155 } else if (val
== 0) {
156 val
= dev_priv
->regfile
.saveBLC_PWM_CTL
;
157 I915_WRITE(BLC_PWM_CTL
, val
);
158 if (INTEL_INFO(dev
)->gen
>= 4)
159 I915_WRITE(BLC_PWM_CTL2
,
160 dev_priv
->regfile
.saveBLC_PWM_CTL2
);
167 static u32
_intel_panel_get_max_backlight(struct drm_device
*dev
)
171 max
= i915_read_blc_pwm_ctl(dev
);
173 if (HAS_PCH_SPLIT(dev
)) {
176 if (INTEL_INFO(dev
)->gen
< 4)
181 if (is_backlight_combination_mode(dev
))
188 u32
intel_panel_get_max_backlight(struct drm_device
*dev
)
192 max
= _intel_panel_get_max_backlight(dev
);
194 /* XXX add code here to query mode clock or hardware clock
195 * and program max PWM appropriately.
197 pr_warn_once("fixme: max PWM is zero\n");
201 DRM_DEBUG_DRIVER("max backlight PWM = %d\n", max
);
205 static int i915_panel_invert_brightness
;
206 MODULE_PARM_DESC(invert_brightness
, "Invert backlight brightness "
207 "(-1 force normal, 0 machine defaults, 1 force inversion), please "
208 "report PCI device ID, subsystem vendor and subsystem device ID "
209 "to dri-devel@lists.freedesktop.org, if your machine needs it. "
210 "It will then be included in an upcoming module version.");
211 module_param_named(invert_brightness
, i915_panel_invert_brightness
, int, 0600);
212 static u32
intel_panel_compute_brightness(struct drm_device
*dev
, u32 val
)
214 struct drm_i915_private
*dev_priv
= dev
->dev_private
;
216 if (i915_panel_invert_brightness
< 0)
219 if (i915_panel_invert_brightness
> 0 ||
220 dev_priv
->quirks
& QUIRK_INVERT_BRIGHTNESS
)
221 return intel_panel_get_max_backlight(dev
) - val
;
226 static u32
intel_panel_get_backlight(struct drm_device
*dev
)
228 struct drm_i915_private
*dev_priv
= dev
->dev_private
;
231 if (HAS_PCH_SPLIT(dev
)) {
232 val
= I915_READ(BLC_PWM_CPU_CTL
) & BACKLIGHT_DUTY_CYCLE_MASK
;
234 val
= I915_READ(BLC_PWM_CTL
) & BACKLIGHT_DUTY_CYCLE_MASK
;
235 if (INTEL_INFO(dev
)->gen
< 4)
238 if (is_backlight_combination_mode(dev
)) {
241 pci_read_config_byte(dev
->pdev
, PCI_LBPC
, &lbpc
);
246 val
= intel_panel_compute_brightness(dev
, val
);
247 DRM_DEBUG_DRIVER("get backlight PWM = %d\n", val
);
251 static void intel_pch_panel_set_backlight(struct drm_device
*dev
, u32 level
)
253 struct drm_i915_private
*dev_priv
= dev
->dev_private
;
254 u32 val
= I915_READ(BLC_PWM_CPU_CTL
) & ~BACKLIGHT_DUTY_CYCLE_MASK
;
255 I915_WRITE(BLC_PWM_CPU_CTL
, val
| level
);
258 static void intel_panel_actually_set_backlight(struct drm_device
*dev
, u32 level
)
260 struct drm_i915_private
*dev_priv
= dev
->dev_private
;
263 DRM_DEBUG_DRIVER("set backlight PWM = %d\n", level
);
264 level
= intel_panel_compute_brightness(dev
, level
);
266 if (HAS_PCH_SPLIT(dev
))
267 return intel_pch_panel_set_backlight(dev
, level
);
269 if (is_backlight_combination_mode(dev
)) {
270 u32 max
= intel_panel_get_max_backlight(dev
);
273 lbpc
= level
* 0xfe / max
+ 1;
275 pci_write_config_byte(dev
->pdev
, PCI_LBPC
, lbpc
);
278 tmp
= I915_READ(BLC_PWM_CTL
);
279 if (INTEL_INFO(dev
)->gen
< 4)
281 tmp
&= ~BACKLIGHT_DUTY_CYCLE_MASK
;
282 I915_WRITE(BLC_PWM_CTL
, tmp
| level
);
285 void intel_panel_set_backlight(struct drm_device
*dev
, u32 level
)
287 struct drm_i915_private
*dev_priv
= dev
->dev_private
;
289 dev_priv
->backlight_level
= level
;
290 if (dev_priv
->backlight_enabled
)
291 intel_panel_actually_set_backlight(dev
, level
);
294 void intel_panel_disable_backlight(struct drm_device
*dev
)
296 struct drm_i915_private
*dev_priv
= dev
->dev_private
;
298 dev_priv
->backlight_enabled
= false;
299 intel_panel_actually_set_backlight(dev
, 0);
301 if (INTEL_INFO(dev
)->gen
>= 4) {
304 reg
= HAS_PCH_SPLIT(dev
) ? BLC_PWM_CPU_CTL2
: BLC_PWM_CTL2
;
306 I915_WRITE(reg
, I915_READ(reg
) & ~BLM_PWM_ENABLE
);
308 if (HAS_PCH_SPLIT(dev
)) {
309 tmp
= I915_READ(BLC_PWM_PCH_CTL1
);
310 tmp
&= ~BLM_PCH_PWM_ENABLE
;
311 I915_WRITE(BLC_PWM_PCH_CTL1
, tmp
);
316 void intel_panel_enable_backlight(struct drm_device
*dev
,
319 struct drm_i915_private
*dev_priv
= dev
->dev_private
;
321 if (dev_priv
->backlight_level
== 0)
322 dev_priv
->backlight_level
= intel_panel_get_max_backlight(dev
);
324 if (INTEL_INFO(dev
)->gen
>= 4) {
327 reg
= HAS_PCH_SPLIT(dev
) ? BLC_PWM_CPU_CTL2
: BLC_PWM_CTL2
;
330 tmp
= I915_READ(reg
);
332 /* Note that this can also get called through dpms changes. And
333 * we don't track the backlight dpms state, hence check whether
334 * we have to do anything first. */
335 if (tmp
& BLM_PWM_ENABLE
)
338 if (dev_priv
->num_pipe
== 3)
339 tmp
&= ~BLM_PIPE_SELECT_IVB
;
341 tmp
&= ~BLM_PIPE_SELECT
;
343 tmp
|= BLM_PIPE(pipe
);
344 tmp
&= ~BLM_PWM_ENABLE
;
346 I915_WRITE(reg
, tmp
);
348 I915_WRITE(reg
, tmp
| BLM_PWM_ENABLE
);
350 if (HAS_PCH_SPLIT(dev
)) {
351 tmp
= I915_READ(BLC_PWM_PCH_CTL1
);
352 tmp
|= BLM_PCH_PWM_ENABLE
;
353 tmp
&= ~BLM_PCH_OVERRIDE_ENABLE
;
354 I915_WRITE(BLC_PWM_PCH_CTL1
, tmp
);
359 /* Call below after setting BLC_PWM_CPU_CTL2 and BLC_PWM_PCH_CTL1.
360 * BLC_PWM_CPU_CTL may be cleared to zero automatically when these
363 dev_priv
->backlight_enabled
= true;
364 intel_panel_actually_set_backlight(dev
, dev_priv
->backlight_level
);
367 static void intel_panel_init_backlight(struct drm_device
*dev
)
369 struct drm_i915_private
*dev_priv
= dev
->dev_private
;
371 dev_priv
->backlight_level
= intel_panel_get_backlight(dev
);
372 dev_priv
->backlight_enabled
= dev_priv
->backlight_level
!= 0;
375 enum drm_connector_status
376 intel_panel_detect(struct drm_device
*dev
)
378 struct drm_i915_private
*dev_priv
= dev
->dev_private
;
380 /* Assume that the BIOS does not lie through the OpRegion... */
381 if (!i915_panel_ignore_lid
&& dev_priv
->opregion
.lid_state
) {
382 return ioread32(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
;
397 #ifdef CONFIG_BACKLIGHT_CLASS_DEVICE
398 static int intel_panel_update_status(struct backlight_device
*bd
)
400 struct drm_device
*dev
= bl_get_data(bd
);
401 intel_panel_set_backlight(dev
, bd
->props
.brightness
);
405 static int intel_panel_get_brightness(struct backlight_device
*bd
)
407 struct drm_device
*dev
= bl_get_data(bd
);
408 struct drm_i915_private
*dev_priv
= dev
->dev_private
;
409 return dev_priv
->backlight_level
;
412 static const struct backlight_ops intel_panel_bl_ops
= {
413 .update_status
= intel_panel_update_status
,
414 .get_brightness
= intel_panel_get_brightness
,
417 int intel_panel_setup_backlight(struct drm_connector
*connector
)
419 struct drm_device
*dev
= connector
->dev
;
420 struct drm_i915_private
*dev_priv
= dev
->dev_private
;
421 struct backlight_properties props
;
423 intel_panel_init_backlight(dev
);
425 memset(&props
, 0, sizeof(props
));
426 props
.type
= BACKLIGHT_RAW
;
427 props
.max_brightness
= _intel_panel_get_max_backlight(dev
);
428 if (props
.max_brightness
== 0) {
429 DRM_DEBUG_DRIVER("Failed to get maximum backlight value\n");
432 dev_priv
->backlight
=
433 backlight_device_register("intel_backlight",
434 &connector
->kdev
, dev
,
435 &intel_panel_bl_ops
, &props
);
437 if (IS_ERR(dev_priv
->backlight
)) {
438 DRM_ERROR("Failed to register backlight: %ld\n",
439 PTR_ERR(dev_priv
->backlight
));
440 dev_priv
->backlight
= NULL
;
443 dev_priv
->backlight
->props
.brightness
= intel_panel_get_backlight(dev
);
447 void intel_panel_destroy_backlight(struct drm_device
*dev
)
449 struct drm_i915_private
*dev_priv
= dev
->dev_private
;
450 if (dev_priv
->backlight
)
451 backlight_device_unregister(dev_priv
->backlight
);
454 int intel_panel_setup_backlight(struct drm_connector
*connector
)
456 intel_panel_init_backlight(connector
->dev
);
460 void intel_panel_destroy_backlight(struct drm_device
*dev
)
466 int intel_panel_init(struct intel_panel
*panel
,
467 struct drm_display_mode
*fixed_mode
)
469 panel
->fixed_mode
= fixed_mode
;
474 void intel_panel_fini(struct intel_panel
*panel
)
476 struct intel_connector
*intel_connector
=
477 container_of(panel
, struct intel_connector
, panel
);
479 if (panel
->fixed_mode
)
480 drm_mode_destroy(intel_connector
->base
.dev
, panel
->fixed_mode
);