1/*
2 * Copyright �� 2006-2010 Intel Corporation
3 * Copyright (c) 2006 Dave Airlie <airlied@linux.ie>
4 *
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:
11 *
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
14 * Software.
15 *
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.
23 *
24 * Authors:
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>
29 */
30
31#include <sys/cdefs.h>
32__FBSDID("$FreeBSD: releng/11.0/sys/dev/drm2/i915/intel_panel.c 296548 2016-03-08 20:33:02Z dumbbell $");
33
34#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
35
36#include <dev/drm2/drmP.h>
37#include <dev/drm2/i915/intel_drv.h>
38
39#define PCI_LBPC 0xf4 /* legacy/combination backlight modes */
40
41void
42intel_fixed_panel_mode(struct drm_display_mode *fixed_mode,
43		       struct drm_display_mode *adjusted_mode)
44{
45	adjusted_mode->hdisplay = fixed_mode->hdisplay;
46	adjusted_mode->hsync_start = fixed_mode->hsync_start;
47	adjusted_mode->hsync_end = fixed_mode->hsync_end;
48	adjusted_mode->htotal = fixed_mode->htotal;
49
50	adjusted_mode->vdisplay = fixed_mode->vdisplay;
51	adjusted_mode->vsync_start = fixed_mode->vsync_start;
52	adjusted_mode->vsync_end = fixed_mode->vsync_end;
53	adjusted_mode->vtotal = fixed_mode->vtotal;
54
55	adjusted_mode->clock = fixed_mode->clock;
56}
57
58/* adjusted_mode has been preset to be the panel's fixed mode */
59void
60intel_pch_panel_fitting(struct drm_device *dev,
61			int fitting_mode,
62			const struct drm_display_mode *mode,
63			struct drm_display_mode *adjusted_mode)
64{
65	struct drm_i915_private *dev_priv = dev->dev_private;
66	int x, y, width, height;
67
68	x = y = width = height = 0;
69
70	/* Native modes don't need fitting */
71	if (adjusted_mode->hdisplay == mode->hdisplay &&
72	    adjusted_mode->vdisplay == mode->vdisplay)
73		goto done;
74
75	switch (fitting_mode) {
76	case DRM_MODE_SCALE_CENTER:
77		width = mode->hdisplay;
78		height = mode->vdisplay;
79		x = (adjusted_mode->hdisplay - width + 1)/2;
80		y = (adjusted_mode->vdisplay - height + 1)/2;
81		break;
82
83	case DRM_MODE_SCALE_ASPECT:
84		/* Scale but preserve the aspect ratio */
85		{
86			u32 scaled_width = adjusted_mode->hdisplay * mode->vdisplay;
87			u32 scaled_height = mode->hdisplay * adjusted_mode->vdisplay;
88			if (scaled_width > scaled_height) { /* pillar */
89				width = scaled_height / mode->vdisplay;
90				if (width & 1)
91					width++;
92				x = (adjusted_mode->hdisplay - width + 1) / 2;
93				y = 0;
94				height = adjusted_mode->vdisplay;
95			} else if (scaled_width < scaled_height) { /* letter */
96				height = scaled_width / mode->hdisplay;
97				if (height & 1)
98				    height++;
99				y = (adjusted_mode->vdisplay - height + 1) / 2;
100				x = 0;
101				width = adjusted_mode->hdisplay;
102			} else {
103				x = y = 0;
104				width = adjusted_mode->hdisplay;
105				height = adjusted_mode->vdisplay;
106			}
107		}
108		break;
109
110	default:
111	case DRM_MODE_SCALE_FULLSCREEN:
112		x = y = 0;
113		width = adjusted_mode->hdisplay;
114		height = adjusted_mode->vdisplay;
115		break;
116	}
117
118done:
119	dev_priv->pch_pf_pos = (x << 16) | y;
120	dev_priv->pch_pf_size = (width << 16) | height;
121}
122
123static int is_backlight_combination_mode(struct drm_device *dev)
124{
125	struct drm_i915_private *dev_priv = dev->dev_private;
126
127	if (INTEL_INFO(dev)->gen >= 4)
128		return I915_READ(BLC_PWM_CTL2) & BLM_COMBINATION_MODE;
129
130	if (IS_GEN2(dev))
131		return I915_READ(BLC_PWM_CTL) & BLM_LEGACY_MODE;
132
133	return 0;
134}
135
136static u32 i915_read_blc_pwm_ctl(struct drm_device *dev)
137{
138	struct drm_i915_private *dev_priv = dev->dev_private;
139	u32 val;
140
141	/* Restore the CTL value if it lost, e.g. GPU reset */
142
143	if (HAS_PCH_SPLIT(dev_priv->dev)) {
144		val = I915_READ(BLC_PWM_PCH_CTL2);
145		if (dev_priv->regfile.saveBLC_PWM_CTL2 == 0) {
146			dev_priv->regfile.saveBLC_PWM_CTL2 = val;
147		} else if (val == 0) {
148			val = dev_priv->regfile.saveBLC_PWM_CTL2;
149			I915_WRITE(BLC_PWM_PCH_CTL2, val);
150		}
151	} else {
152		val = I915_READ(BLC_PWM_CTL);
153		if (dev_priv->regfile.saveBLC_PWM_CTL == 0) {
154			dev_priv->regfile.saveBLC_PWM_CTL = val;
155			if (INTEL_INFO(dev)->gen >= 4)
156				dev_priv->regfile.saveBLC_PWM_CTL2 =
157					I915_READ(BLC_PWM_CTL2);
158		} else if (val == 0) {
159			val = dev_priv->regfile.saveBLC_PWM_CTL;
160			I915_WRITE(BLC_PWM_CTL, val);
161			if (INTEL_INFO(dev)->gen >= 4)
162				I915_WRITE(BLC_PWM_CTL2,
163					   dev_priv->regfile.saveBLC_PWM_CTL2);
164		}
165	}
166
167	return val;
168}
169
170static u32 _intel_panel_get_max_backlight(struct drm_device *dev)
171{
172	u32 max;
173
174	max = i915_read_blc_pwm_ctl(dev);
175
176	if (HAS_PCH_SPLIT(dev)) {
177		max >>= 16;
178	} else {
179		if (INTEL_INFO(dev)->gen < 4)
180			max >>= 17;
181		else
182			max >>= 16;
183
184		if (is_backlight_combination_mode(dev))
185			max *= 0xff;
186	}
187
188	return max;
189}
190
191u32 intel_panel_get_max_backlight(struct drm_device *dev)
192{
193	u32 max;
194
195	max = _intel_panel_get_max_backlight(dev);
196	if (max == 0) {
197		/* XXX add code here to query mode clock or hardware clock
198		 * and program max PWM appropriately.
199		 */
200		pr_warn_once("fixme: max PWM is zero\n");
201		return 1;
202	}
203
204	DRM_DEBUG_DRIVER("max backlight PWM = %d\n", max);
205	return max;
206}
207
208static int i915_panel_invert_brightness;
209TUNABLE_INT("drm.i915.invert_brightness", &i915_panel_invert_brightness);
210MODULE_PARM_DESC(invert_brightness, "Invert backlight brightness "
211	"(-1 force normal, 0 machine defaults, 1 force inversion), please "
212	"report PCI device ID, subsystem vendor and subsystem device ID "
213	"to dri-devel@lists.freedesktop.org, if your machine needs it. "
214	"It will then be included in an upcoming module version.");
215module_param_named(invert_brightness, i915_panel_invert_brightness, int, 0600);
216static u32 intel_panel_compute_brightness(struct drm_device *dev, u32 val)
217{
218	struct drm_i915_private *dev_priv = dev->dev_private;
219
220	if (i915_panel_invert_brightness < 0)
221		return val;
222
223	if (i915_panel_invert_brightness > 0 ||
224	    dev_priv->quirks & QUIRK_INVERT_BRIGHTNESS)
225		return intel_panel_get_max_backlight(dev) - val;
226
227	return val;
228}
229
230static u32 intel_panel_get_backlight(struct drm_device *dev)
231{
232	struct drm_i915_private *dev_priv = dev->dev_private;
233	u32 val;
234
235	if (HAS_PCH_SPLIT(dev)) {
236		val = I915_READ(BLC_PWM_CPU_CTL) & BACKLIGHT_DUTY_CYCLE_MASK;
237	} else {
238		val = I915_READ(BLC_PWM_CTL) & BACKLIGHT_DUTY_CYCLE_MASK;
239		if (INTEL_INFO(dev)->gen < 4)
240			val >>= 1;
241
242		if (is_backlight_combination_mode(dev)) {
243			u8 lbpc;
244
245			pci_read_config_byte(dev->dev, PCI_LBPC, &lbpc);
246			val *= lbpc;
247		}
248	}
249
250	val = intel_panel_compute_brightness(dev, val);
251	DRM_DEBUG_DRIVER("get backlight PWM = %d\n", val);
252	return val;
253}
254
255static void intel_pch_panel_set_backlight(struct drm_device *dev, u32 level)
256{
257	struct drm_i915_private *dev_priv = dev->dev_private;
258	u32 val = I915_READ(BLC_PWM_CPU_CTL) & ~BACKLIGHT_DUTY_CYCLE_MASK;
259	I915_WRITE(BLC_PWM_CPU_CTL, val | level);
260}
261
262static void intel_panel_actually_set_backlight(struct drm_device *dev, u32 level)
263{
264	struct drm_i915_private *dev_priv = dev->dev_private;
265	u32 tmp;
266
267	DRM_DEBUG_DRIVER("set backlight PWM = %d\n", level);
268	level = intel_panel_compute_brightness(dev, level);
269
270	if (HAS_PCH_SPLIT(dev))
271		return intel_pch_panel_set_backlight(dev, level);
272
273	if (is_backlight_combination_mode(dev)) {
274		u32 max = intel_panel_get_max_backlight(dev);
275		u8 lbpc;
276
277		lbpc = level * 0xfe / max + 1;
278		level /= lbpc;
279		pci_write_config_byte(dev->dev, PCI_LBPC, lbpc);
280	}
281
282	tmp = I915_READ(BLC_PWM_CTL);
283	if (INTEL_INFO(dev)->gen < 4)
284		level <<= 1;
285	tmp &= ~BACKLIGHT_DUTY_CYCLE_MASK;
286	I915_WRITE(BLC_PWM_CTL, tmp | level);
287}
288
289void intel_panel_set_backlight(struct drm_device *dev, u32 level)
290{
291	struct drm_i915_private *dev_priv = dev->dev_private;
292
293	dev_priv->backlight_level = level;
294	if (dev_priv->backlight_enabled)
295		intel_panel_actually_set_backlight(dev, level);
296}
297
298void intel_panel_disable_backlight(struct drm_device *dev)
299{
300	struct drm_i915_private *dev_priv = dev->dev_private;
301
302	dev_priv->backlight_enabled = false;
303	intel_panel_actually_set_backlight(dev, 0);
304
305	if (INTEL_INFO(dev)->gen >= 4) {
306		uint32_t reg, tmp;
307
308		reg = HAS_PCH_SPLIT(dev) ? BLC_PWM_CPU_CTL2 : BLC_PWM_CTL2;
309
310		I915_WRITE(reg, I915_READ(reg) & ~BLM_PWM_ENABLE);
311
312		if (HAS_PCH_SPLIT(dev)) {
313			tmp = I915_READ(BLC_PWM_PCH_CTL1);
314			tmp &= ~BLM_PCH_PWM_ENABLE;
315			I915_WRITE(BLC_PWM_PCH_CTL1, tmp);
316		}
317	}
318}
319
320void intel_panel_enable_backlight(struct drm_device *dev,
321				  enum pipe pipe)
322{
323	struct drm_i915_private *dev_priv = dev->dev_private;
324
325	if (dev_priv->backlight_level == 0)
326		dev_priv->backlight_level = intel_panel_get_max_backlight(dev);
327
328	if (INTEL_INFO(dev)->gen >= 4) {
329		uint32_t reg, tmp;
330
331		reg = HAS_PCH_SPLIT(dev) ? BLC_PWM_CPU_CTL2 : BLC_PWM_CTL2;
332
333
334		tmp = I915_READ(reg);
335
336		/* Note that this can also get called through dpms changes. And
337		 * we don't track the backlight dpms state, hence check whether
338		 * we have to do anything first. */
339		if (tmp & BLM_PWM_ENABLE)
340			goto set_level;
341
342		if (dev_priv->num_pipe == 3)
343			tmp &= ~BLM_PIPE_SELECT_IVB;
344		else
345			tmp &= ~BLM_PIPE_SELECT;
346
347		tmp |= BLM_PIPE(pipe);
348		tmp &= ~BLM_PWM_ENABLE;
349
350		I915_WRITE(reg, tmp);
351		POSTING_READ(reg);
352		I915_WRITE(reg, tmp | BLM_PWM_ENABLE);
353
354		if (HAS_PCH_SPLIT(dev)) {
355			tmp = I915_READ(BLC_PWM_PCH_CTL1);
356			tmp |= BLM_PCH_PWM_ENABLE;
357			tmp &= ~BLM_PCH_OVERRIDE_ENABLE;
358			I915_WRITE(BLC_PWM_PCH_CTL1, tmp);
359		}
360	}
361
362set_level:
363	/* Call below after setting BLC_PWM_CPU_CTL2 and BLC_PWM_PCH_CTL1.
364	 * BLC_PWM_CPU_CTL may be cleared to zero automatically when these
365	 * registers are set.
366	 */
367	dev_priv->backlight_enabled = true;
368	intel_panel_actually_set_backlight(dev, dev_priv->backlight_level);
369}
370
371static void intel_panel_init_backlight(struct drm_device *dev)
372{
373	struct drm_i915_private *dev_priv = dev->dev_private;
374
375	dev_priv->backlight_level = intel_panel_get_backlight(dev);
376	dev_priv->backlight_enabled = dev_priv->backlight_level != 0;
377}
378
379enum drm_connector_status
380intel_panel_detect(struct drm_device *dev)
381{
382	struct drm_i915_private *dev_priv = dev->dev_private;
383
384	/* Assume that the BIOS does not lie through the OpRegion... */
385	if (!i915_panel_ignore_lid && dev_priv->opregion.lid_state) {
386		return ioread32(dev_priv->opregion.lid_state) & 0x1 ?
387			connector_status_connected :
388			connector_status_disconnected;
389	}
390
391	switch (i915_panel_ignore_lid) {
392	case -2:
393		return connector_status_connected;
394	case -1:
395		return connector_status_disconnected;
396	default:
397		return connector_status_unknown;
398	}
399}
400
401#ifdef CONFIG_BACKLIGHT_CLASS_DEVICE
402static int intel_panel_update_status(struct backlight_device *bd)
403{
404	struct drm_device *dev = bl_get_data(bd);
405	intel_panel_set_backlight(dev, bd->props.brightness);
406	return 0;
407}
408
409static int intel_panel_get_brightness(struct backlight_device *bd)
410{
411	struct drm_device *dev = bl_get_data(bd);
412	struct drm_i915_private *dev_priv = dev->dev_private;
413	return dev_priv->backlight_level;
414}
415
416static const struct backlight_ops intel_panel_bl_ops = {
417	.update_status = intel_panel_update_status,
418	.get_brightness = intel_panel_get_brightness,
419};
420
421int intel_panel_setup_backlight(struct drm_connector *connector)
422{
423	struct drm_device *dev = connector->dev;
424	struct drm_i915_private *dev_priv = dev->dev_private;
425	struct backlight_properties props;
426
427	intel_panel_init_backlight(dev);
428
429	if (WARN_ON(dev_priv->backlight))
430		return -ENODEV;
431
432	memset(&props, 0, sizeof(props));
433	props.type = BACKLIGHT_RAW;
434	props.max_brightness = _intel_panel_get_max_backlight(dev);
435	if (props.max_brightness == 0) {
436		DRM_DEBUG_DRIVER("Failed to get maximum backlight value\n");
437		return -ENODEV;
438	}
439	dev_priv->backlight =
440		backlight_device_register("intel_backlight",
441					  &connector->kdev, dev,
442					  &intel_panel_bl_ops, &props);
443
444	if (IS_ERR(dev_priv->backlight)) {
445		DRM_ERROR("Failed to register backlight: %ld\n",
446			  PTR_ERR(dev_priv->backlight));
447		dev_priv->backlight = NULL;
448		return -ENODEV;
449	}
450	dev_priv->backlight->props.brightness = intel_panel_get_backlight(dev);
451	return 0;
452}
453
454void intel_panel_destroy_backlight(struct drm_device *dev)
455{
456	struct drm_i915_private *dev_priv = dev->dev_private;
457	if (dev_priv->backlight) {
458		backlight_device_unregister(dev_priv->backlight);
459		dev_priv->backlight = NULL;
460	}
461}
462#else
463int intel_panel_setup_backlight(struct drm_connector *connector)
464{
465	intel_panel_init_backlight(connector->dev);
466	return 0;
467}
468
469void intel_panel_destroy_backlight(struct drm_device *dev)
470{
471	return;
472}
473#endif
474
475int intel_panel_init(struct intel_panel *panel,
476		     struct drm_display_mode *fixed_mode)
477{
478	panel->fixed_mode = fixed_mode;
479
480	return 0;
481}
482
483void intel_panel_fini(struct intel_panel *panel)
484{
485	struct intel_connector *intel_connector =
486		container_of(panel, struct intel_connector, panel);
487
488	if (panel->fixed_mode)
489		drm_mode_destroy(intel_connector->base.dev, panel->fixed_mode);
490}
491