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 #include "intel_drv.h"
34 intel_fixed_panel_mode(struct drm_display_mode *fixed_mode,
35 struct drm_display_mode *adjusted_mode)
37 adjusted_mode->hdisplay = fixed_mode->hdisplay;
38 adjusted_mode->hsync_start = fixed_mode->hsync_start;
39 adjusted_mode->hsync_end = fixed_mode->hsync_end;
40 adjusted_mode->htotal = fixed_mode->htotal;
42 adjusted_mode->vdisplay = fixed_mode->vdisplay;
43 adjusted_mode->vsync_start = fixed_mode->vsync_start;
44 adjusted_mode->vsync_end = fixed_mode->vsync_end;
45 adjusted_mode->vtotal = fixed_mode->vtotal;
47 adjusted_mode->clock = fixed_mode->clock;
49 drm_mode_set_crtcinfo(adjusted_mode, CRTC_INTERLACE_HALVE_V);
52 /* adjusted_mode has been preset to be the panel's fixed mode */
54 intel_pch_panel_fitting(struct drm_device *dev,
56 struct drm_display_mode *mode,
57 struct drm_display_mode *adjusted_mode)
59 struct drm_i915_private *dev_priv = dev->dev_private;
60 int x, y, width, height;
62 x = y = width = height = 0;
64 /* Native modes don't need fitting */
65 if (adjusted_mode->hdisplay == mode->hdisplay &&
66 adjusted_mode->vdisplay == mode->vdisplay)
69 switch (fitting_mode) {
70 case DRM_MODE_SCALE_CENTER:
71 width = mode->hdisplay;
72 height = mode->vdisplay;
73 x = (adjusted_mode->hdisplay - width + 1)/2;
74 y = (adjusted_mode->vdisplay - height + 1)/2;
77 case DRM_MODE_SCALE_ASPECT:
78 /* Scale but preserve the aspect ratio */
80 u32 scaled_width = adjusted_mode->hdisplay * mode->vdisplay;
81 u32 scaled_height = mode->hdisplay * adjusted_mode->vdisplay;
82 if (scaled_width > scaled_height) { /* pillar */
83 width = scaled_height / mode->vdisplay;
84 x = (adjusted_mode->hdisplay - width + 1) / 2;
86 height = adjusted_mode->vdisplay;
87 } else if (scaled_width < scaled_height) { /* letter */
88 height = scaled_width / mode->hdisplay;
89 y = (adjusted_mode->vdisplay - height + 1) / 2;
91 width = adjusted_mode->hdisplay;
94 width = adjusted_mode->hdisplay;
95 height = adjusted_mode->vdisplay;
101 case DRM_MODE_SCALE_FULLSCREEN:
103 width = adjusted_mode->hdisplay;
104 height = adjusted_mode->vdisplay;
109 dev_priv->pch_pf_pos = (x << 16) | y;
110 dev_priv->pch_pf_size = (width << 16) | height;
113 static u32 i915_read_blc_pwm_ctl(struct drm_i915_private *dev_priv)
117 /* Restore the CTL value if it lost, e.g. GPU reset */
119 if (HAS_PCH_SPLIT(dev_priv->dev)) {
120 val = I915_READ(BLC_PWM_PCH_CTL2);
121 if (dev_priv->saveBLC_PWM_CTL2 == 0) {
122 dev_priv->saveBLC_PWM_CTL2 = val;
123 } else if (val == 0) {
124 I915_WRITE(BLC_PWM_PCH_CTL2,
125 dev_priv->saveBLC_PWM_CTL);
126 val = dev_priv->saveBLC_PWM_CTL;
129 val = I915_READ(BLC_PWM_CTL);
130 if (dev_priv->saveBLC_PWM_CTL == 0) {
131 dev_priv->saveBLC_PWM_CTL = val;
132 dev_priv->saveBLC_PWM_CTL2 = I915_READ(BLC_PWM_CTL2);
133 } else if (val == 0) {
134 I915_WRITE(BLC_PWM_CTL,
135 dev_priv->saveBLC_PWM_CTL);
136 I915_WRITE(BLC_PWM_CTL2,
137 dev_priv->saveBLC_PWM_CTL2);
138 val = dev_priv->saveBLC_PWM_CTL;
145 u32 intel_panel_get_max_backlight(struct drm_device *dev)
147 struct drm_i915_private *dev_priv = dev->dev_private;
150 max = i915_read_blc_pwm_ctl(dev_priv);
152 /* XXX add code here to query mode clock or hardware clock
153 * and program max PWM appropriately.
155 printk_once(KERN_WARNING "fixme: max PWM is zero.\n");
159 if (HAS_PCH_SPLIT(dev)) {
162 if (IS_PINEVIEW(dev)) {
166 if (INTEL_INFO(dev)->gen < 4)
171 DRM_DEBUG_DRIVER("max backlight PWM = %d\n", max);
175 u32 intel_panel_get_backlight(struct drm_device *dev)
177 struct drm_i915_private *dev_priv = dev->dev_private;
180 if (HAS_PCH_SPLIT(dev)) {
181 val = I915_READ(BLC_PWM_CPU_CTL) & BACKLIGHT_DUTY_CYCLE_MASK;
183 val = I915_READ(BLC_PWM_CTL) & BACKLIGHT_DUTY_CYCLE_MASK;
184 if (IS_PINEVIEW(dev))
188 DRM_DEBUG_DRIVER("get backlight PWM = %d\n", val);
192 static void intel_pch_panel_set_backlight(struct drm_device *dev, u32 level)
194 struct drm_i915_private *dev_priv = dev->dev_private;
195 u32 val = I915_READ(BLC_PWM_CPU_CTL) & ~BACKLIGHT_DUTY_CYCLE_MASK;
196 I915_WRITE(BLC_PWM_CPU_CTL, val | level);
199 void intel_panel_set_backlight(struct drm_device *dev, u32 level)
201 struct drm_i915_private *dev_priv = dev->dev_private;
204 DRM_DEBUG_DRIVER("set backlight PWM = %d\n", level);
206 if (HAS_PCH_SPLIT(dev))
207 return intel_pch_panel_set_backlight(dev, level);
208 tmp = I915_READ(BLC_PWM_CTL);
209 if (IS_PINEVIEW(dev)) {
210 tmp &= ~(BACKLIGHT_DUTY_CYCLE_MASK - 1);
213 tmp &= ~BACKLIGHT_DUTY_CYCLE_MASK;
214 I915_WRITE(BLC_PWM_CTL, tmp | level);
217 void intel_panel_disable_backlight(struct drm_device *dev)
219 struct drm_i915_private *dev_priv = dev->dev_private;
221 if (dev_priv->backlight_enabled) {
222 dev_priv->backlight_level = intel_panel_get_backlight(dev);
223 dev_priv->backlight_enabled = false;
226 intel_panel_set_backlight(dev, 0);
229 void intel_panel_enable_backlight(struct drm_device *dev)
231 struct drm_i915_private *dev_priv = dev->dev_private;
233 if (dev_priv->backlight_level == 0)
234 dev_priv->backlight_level = intel_panel_get_max_backlight(dev);
236 intel_panel_set_backlight(dev, dev_priv->backlight_level);
237 dev_priv->backlight_enabled = true;
240 void intel_panel_setup_backlight(struct drm_device *dev)
242 struct drm_i915_private *dev_priv = dev->dev_private;
244 dev_priv->backlight_level = intel_panel_get_backlight(dev);
245 dev_priv->backlight_enabled = dev_priv->backlight_level != 0;