intel_panel.c revision 282199 
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: stable/10/sys/dev/drm2/i915/intel_panel.c 282199 2015-04-28 19:35:05Z dumbbell $");
33
34#include <dev/drm2/drmP.h>
35#include <dev/drm2/drm.h>
36#include <dev/drm2/i915/i915_drm.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_i915_private *dev_priv)
137{
138	u32 val;
139
140	/* Restore the CTL value if it lost, e.g. GPU reset */
141
142	if (HAS_PCH_SPLIT(dev_priv->dev)) {
143		val = I915_READ(BLC_PWM_PCH_CTL2);
144		if (dev_priv->saveBLC_PWM_CTL2 == 0) {
145			dev_priv->saveBLC_PWM_CTL2 = val;
146		} else if (val == 0) {
147			I915_WRITE(BLC_PWM_PCH_CTL2,
148				   dev_priv->saveBLC_PWM_CTL2);
149			val = dev_priv->saveBLC_PWM_CTL2;
150		}
151	} else {
152		val = I915_READ(BLC_PWM_CTL);
153		if (dev_priv->saveBLC_PWM_CTL == 0) {
154			dev_priv->saveBLC_PWM_CTL = val;
155			dev_priv->saveBLC_PWM_CTL2 = I915_READ(BLC_PWM_CTL2);
156		} else if (val == 0) {
157			I915_WRITE(BLC_PWM_CTL,
158				   dev_priv->saveBLC_PWM_CTL);
159			I915_WRITE(BLC_PWM_CTL2,
160				   dev_priv->saveBLC_PWM_CTL2);
161			val = dev_priv->saveBLC_PWM_CTL;
162		}
163	}
164
165	return val;
166}
167
168u32 intel_panel_get_max_backlight(struct drm_device *dev)
169{
170	struct drm_i915_private *dev_priv = dev->dev_private;
171	u32 max;
172
173	max = i915_read_blc_pwm_ctl(dev_priv);
174	if (max == 0) {
175		/* XXX add code here to query mode clock or hardware clock
176		 * and program max PWM appropriately.
177		 */
178#if 0
179		printf("fixme: max PWM is zero.\n");
180#endif
181		return 1;
182	}
183
184	if (HAS_PCH_SPLIT(dev)) {
185		max >>= 16;
186	} else {
187		if (INTEL_INFO(dev)->gen < 4)
188			max >>= 17;
189		else
190			max >>= 16;
191
192		if (is_backlight_combination_mode(dev))
193			max *= 0xff;
194	}
195
196	DRM_DEBUG("max backlight PWM = %d\n", max);
197	return max;
198}
199
200static u32 intel_panel_compute_brightness(struct drm_device *dev, u32 val)
201{
202	struct drm_i915_private *dev_priv = dev->dev_private;
203
204	if (i915_panel_invert_brightness < 0)
205		return val;
206
207	if (i915_panel_invert_brightness > 0 ||
208	    dev_priv->quirks & QUIRK_INVERT_BRIGHTNESS)
209		return intel_panel_get_max_backlight(dev) - val;
210
211	return val;
212}
213
214u32 intel_panel_get_backlight(struct drm_device *dev)
215{
216	struct drm_i915_private *dev_priv = dev->dev_private;
217	u32 val;
218
219	if (HAS_PCH_SPLIT(dev)) {
220		val = I915_READ(BLC_PWM_CPU_CTL) & BACKLIGHT_DUTY_CYCLE_MASK;
221	} else {
222		val = I915_READ(BLC_PWM_CTL) & BACKLIGHT_DUTY_CYCLE_MASK;
223		if (INTEL_INFO(dev)->gen < 4)
224			val >>= 1;
225
226		if (is_backlight_combination_mode(dev)) {
227			u8 lbpc;
228
229			lbpc = pci_read_config(dev->dev, PCI_LBPC, 1);
230			val *= lbpc;
231		}
232	}
233
234	val = intel_panel_compute_brightness(dev, val);
235	DRM_DEBUG_DRIVER("get backlight PWM = %d\n", val);
236	return val;
237}
238
239static void intel_pch_panel_set_backlight(struct drm_device *dev, u32 level)
240{
241	struct drm_i915_private *dev_priv = dev->dev_private;
242	u32 val = I915_READ(BLC_PWM_CPU_CTL) & ~BACKLIGHT_DUTY_CYCLE_MASK;
243	I915_WRITE(BLC_PWM_CPU_CTL, val | level);
244}
245
246static void intel_panel_actually_set_backlight(struct drm_device *dev, u32 level)
247{
248	struct drm_i915_private *dev_priv = dev->dev_private;
249	u32 tmp;
250
251	DRM_DEBUG_DRIVER("set backlight PWM = %d\n", level);
252	level = intel_panel_compute_brightness(dev, level);
253
254	if (HAS_PCH_SPLIT(dev))
255		return intel_pch_panel_set_backlight(dev, level);
256
257	if (is_backlight_combination_mode(dev)) {
258		u32 max = intel_panel_get_max_backlight(dev);
259		u8 lbpc;
260
261		lbpc = level * 0xfe / max + 1;
262		level /= lbpc;
263		pci_write_config(dev->dev, PCI_LBPC, lbpc, 4);
264	}
265
266	tmp = I915_READ(BLC_PWM_CTL);
267	if (INTEL_INFO(dev)->gen < 4)
268		level <<= 1;
269	tmp &= ~BACKLIGHT_DUTY_CYCLE_MASK;
270	I915_WRITE(BLC_PWM_CTL, tmp | level);
271}
272
273void intel_panel_set_backlight(struct drm_device *dev, u32 level)
274{
275	struct drm_i915_private *dev_priv = dev->dev_private;
276
277	dev_priv->backlight_level = level;
278	if (dev_priv->backlight_enabled)
279		intel_panel_actually_set_backlight(dev, level);
280}
281
282void intel_panel_disable_backlight(struct drm_device *dev)
283{
284	struct drm_i915_private *dev_priv = dev->dev_private;
285
286	dev_priv->backlight_enabled = false;
287	intel_panel_actually_set_backlight(dev, 0);
288}
289
290void intel_panel_enable_backlight(struct drm_device *dev)
291{
292	struct drm_i915_private *dev_priv = dev->dev_private;
293
294	if (dev_priv->backlight_level == 0)
295		dev_priv->backlight_level = intel_panel_get_max_backlight(dev);
296
297	dev_priv->backlight_enabled = true;
298	intel_panel_actually_set_backlight(dev, dev_priv->backlight_level);
299}
300
301static void intel_panel_init_backlight(struct drm_device *dev)
302{
303	struct drm_i915_private *dev_priv = dev->dev_private;
304
305	dev_priv->backlight_level = intel_panel_get_backlight(dev);
306	dev_priv->backlight_enabled = dev_priv->backlight_level != 0;
307}
308
309enum drm_connector_status
310intel_panel_detect(struct drm_device *dev)
311{
312#if 0
313	struct drm_i915_private *dev_priv = dev->dev_private;
314#endif
315
316	if (i915_panel_ignore_lid)
317		return i915_panel_ignore_lid > 0 ?
318			connector_status_connected :
319			connector_status_disconnected;
320
321	/* opregion lid state on HP 2540p is wrong at boot up,
322	 * appears to be either the BIOS or Linux ACPI fault */
323#if 0
324	/* Assume that the BIOS does not lie through the OpRegion... */
325	if (dev_priv->opregion.lid_state)
326		return ioread32(dev_priv->opregion.lid_state) & 0x1 ?
327			connector_status_connected :
328			connector_status_disconnected;
329#endif
330
331	return connector_status_unknown;
332}
333
334int intel_panel_setup_backlight(struct drm_device *dev)
335{
336	intel_panel_init_backlight(dev);
337	return 0;
338}
339
340void intel_panel_destroy_backlight(struct drm_device *dev)
341{
342	return;
343}
344