5d9c94eb705513983a47ad53b92c21372e40ec21
[linux-2.6.git] / drivers / gpu / drm / i915 / intel_crt.c
1 /*
2  * Copyright © 2006-2007 Intel Corporation
3  *
4  * Permission is hereby granted, free of charge, to any person obtaining a
5  * copy of this software and associated documentation files (the "Software"),
6  * to deal in the Software without restriction, including without limitation
7  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
8  * and/or sell copies of the Software, and to permit persons to whom the
9  * Software is furnished to do so, subject to the following conditions:
10  *
11  * The above copyright notice and this permission notice (including the next
12  * paragraph) shall be included in all copies or substantial portions of the
13  * Software.
14  *
15  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
16  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
17  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
18  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
19  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
20  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
21  * DEALINGS IN THE SOFTWARE.
22  *
23  * Authors:
24  *      Eric Anholt <eric@anholt.net>
25  */
26
27 #include <linux/i2c.h>
28 #include "drmP.h"
29 #include "drm.h"
30 #include "drm_crtc.h"
31 #include "drm_crtc_helper.h"
32 #include "intel_drv.h"
33 #include "i915_drm.h"
34 #include "i915_drv.h"
35
36 static void intel_crt_dpms(struct drm_encoder *encoder, int mode)
37 {
38         struct drm_device *dev = encoder->dev;
39         struct drm_i915_private *dev_priv = dev->dev_private;
40         u32 temp;
41
42         temp = I915_READ(ADPA);
43         temp &= ~(ADPA_HSYNC_CNTL_DISABLE | ADPA_VSYNC_CNTL_DISABLE);
44         temp &= ~ADPA_DAC_ENABLE;
45
46         switch(mode) {
47         case DRM_MODE_DPMS_ON:
48                 temp |= ADPA_DAC_ENABLE;
49                 break;
50         case DRM_MODE_DPMS_STANDBY:
51                 temp |= ADPA_DAC_ENABLE | ADPA_HSYNC_CNTL_DISABLE;
52                 break;
53         case DRM_MODE_DPMS_SUSPEND:
54                 temp |= ADPA_DAC_ENABLE | ADPA_VSYNC_CNTL_DISABLE;
55                 break;
56         case DRM_MODE_DPMS_OFF:
57                 temp |= ADPA_HSYNC_CNTL_DISABLE | ADPA_VSYNC_CNTL_DISABLE;
58                 break;
59         }
60
61         I915_WRITE(ADPA, temp);
62 }
63
64 static int intel_crt_mode_valid(struct drm_connector *connector,
65                                 struct drm_display_mode *mode)
66 {
67         if (mode->flags & DRM_MODE_FLAG_DBLSCAN)
68                 return MODE_NO_DBLESCAN;
69
70         if (mode->clock > 400000 || mode->clock < 25000)
71                 return MODE_CLOCK_RANGE;
72
73         return MODE_OK;
74 }
75
76 static bool intel_crt_mode_fixup(struct drm_encoder *encoder,
77                                  struct drm_display_mode *mode,
78                                  struct drm_display_mode *adjusted_mode)
79 {
80         return true;
81 }
82
83 static void intel_crt_mode_set(struct drm_encoder *encoder,
84                                struct drm_display_mode *mode,
85                                struct drm_display_mode *adjusted_mode)
86 {
87
88         struct drm_device *dev = encoder->dev;
89         struct drm_crtc *crtc = encoder->crtc;
90         struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
91         struct drm_i915_private *dev_priv = dev->dev_private;
92         int dpll_md_reg;
93         u32 adpa, dpll_md;
94
95         if (intel_crtc->pipe == 0)
96                 dpll_md_reg = DPLL_A_MD;
97         else
98                 dpll_md_reg = DPLL_B_MD;
99
100         /*
101          * Disable separate mode multiplier used when cloning SDVO to CRT
102          * XXX this needs to be adjusted when we really are cloning
103          */
104         if (IS_I965G(dev)) {
105                 dpll_md = I915_READ(dpll_md_reg);
106                 I915_WRITE(dpll_md_reg,
107                            dpll_md & ~DPLL_MD_UDI_MULTIPLIER_MASK);
108         }
109
110         adpa = 0;
111         if (adjusted_mode->flags & DRM_MODE_FLAG_PHSYNC)
112                 adpa |= ADPA_HSYNC_ACTIVE_HIGH;
113         if (adjusted_mode->flags & DRM_MODE_FLAG_PVSYNC)
114                 adpa |= ADPA_VSYNC_ACTIVE_HIGH;
115
116         if (intel_crtc->pipe == 0)
117                 adpa |= ADPA_PIPE_A_SELECT;
118         else
119                 adpa |= ADPA_PIPE_B_SELECT;
120
121         I915_WRITE(ADPA, adpa);
122 }
123
124 /**
125  * Uses CRT_HOTPLUG_EN and CRT_HOTPLUG_STAT to detect CRT presence.
126  *
127  * Not for i915G/i915GM
128  *
129  * \return true if CRT is connected.
130  * \return false if CRT is disconnected.
131  */
132 static bool intel_crt_detect_hotplug(struct drm_connector *connector)
133 {
134         struct drm_device *dev = connector->dev;
135         struct drm_i915_private *dev_priv = dev->dev_private;
136         u32 temp;
137
138         unsigned long timeout = jiffies + msecs_to_jiffies(1000);
139
140         temp = I915_READ(PORT_HOTPLUG_EN);
141
142         I915_WRITE(PORT_HOTPLUG_EN,
143                    temp | CRT_HOTPLUG_FORCE_DETECT | (1 << 5));
144
145         do {
146                 if (!(I915_READ(PORT_HOTPLUG_EN) & CRT_HOTPLUG_FORCE_DETECT))
147                         break;
148                 msleep(1);
149         } while (time_after(timeout, jiffies));
150
151         if ((I915_READ(PORT_HOTPLUG_STAT) & CRT_HOTPLUG_MONITOR_MASK) ==
152             CRT_HOTPLUG_MONITOR_COLOR)
153                 return true;
154
155         return false;
156 }
157
158 static bool intel_crt_detect_ddc(struct drm_connector *connector)
159 {
160         struct intel_output *intel_output = to_intel_output(connector);
161
162         /* CRT should always be at 0, but check anyway */
163         if (intel_output->type != INTEL_OUTPUT_ANALOG)
164                 return false;
165
166         return intel_ddc_probe(intel_output);
167 }
168
169 static enum drm_connector_status intel_crt_detect(struct drm_connector *connector)
170 {
171         struct drm_device *dev = connector->dev;
172
173         if (IS_I9XX(dev) && !IS_I915G(dev) && !IS_I915GM(dev)) {
174                 if (intel_crt_detect_hotplug(connector))
175                         return connector_status_connected;
176                 else
177                         return connector_status_disconnected;
178         }
179
180         if (intel_crt_detect_ddc(connector))
181                 return connector_status_connected;
182
183         /* TODO use load detect */
184         return connector_status_unknown;
185 }
186
187 static void intel_crt_destroy(struct drm_connector *connector)
188 {
189         struct intel_output *intel_output = to_intel_output(connector);
190
191         intel_i2c_destroy(intel_output->ddc_bus);
192         drm_sysfs_connector_remove(connector);
193         drm_connector_cleanup(connector);
194         kfree(connector);
195 }
196
197 static int intel_crt_get_modes(struct drm_connector *connector)
198 {
199         struct intel_output *intel_output = to_intel_output(connector);
200         return intel_ddc_get_modes(intel_output);
201 }
202
203 static int intel_crt_set_property(struct drm_connector *connector,
204                                   struct drm_property *property,
205                                   uint64_t value)
206 {
207         struct drm_device *dev = connector->dev;
208
209         if (property == dev->mode_config.dpms_property && connector->encoder)
210                 intel_crt_dpms(connector->encoder, (uint32_t)(value & 0xf));
211
212         return 0;
213 }
214
215 /*
216  * Routines for controlling stuff on the analog port
217  */
218
219 static const struct drm_encoder_helper_funcs intel_crt_helper_funcs = {
220         .dpms = intel_crt_dpms,
221         .mode_fixup = intel_crt_mode_fixup,
222         .prepare = intel_encoder_prepare,
223         .commit = intel_encoder_commit,
224         .mode_set = intel_crt_mode_set,
225 };
226
227 static const struct drm_connector_funcs intel_crt_connector_funcs = {
228         .detect = intel_crt_detect,
229         .fill_modes = drm_helper_probe_single_connector_modes,
230         .destroy = intel_crt_destroy,
231         .set_property = intel_crt_set_property,
232 };
233
234 static const struct drm_connector_helper_funcs intel_crt_connector_helper_funcs = {
235         .mode_valid = intel_crt_mode_valid,
236         .get_modes = intel_crt_get_modes,
237         .best_encoder = intel_best_encoder,
238 };
239
240 void intel_crt_enc_destroy(struct drm_encoder *encoder)
241 {
242         drm_encoder_cleanup(encoder);
243 }
244
245 static const struct drm_encoder_funcs intel_crt_enc_funcs = {
246         .destroy = intel_crt_enc_destroy,
247 };
248
249 void intel_crt_init(struct drm_device *dev)
250 {
251         struct drm_connector *connector;
252         struct intel_output *intel_output;
253
254         intel_output = kzalloc(sizeof(struct intel_output), GFP_KERNEL);
255         if (!intel_output)
256                 return;
257
258         connector = &intel_output->base;
259         drm_connector_init(dev, &intel_output->base,
260                            &intel_crt_connector_funcs, DRM_MODE_CONNECTOR_VGA);
261
262         drm_encoder_init(dev, &intel_output->enc, &intel_crt_enc_funcs,
263                          DRM_MODE_ENCODER_DAC);
264
265         drm_mode_connector_attach_encoder(&intel_output->base,
266                                           &intel_output->enc);
267
268         /* Set up the DDC bus. */
269         intel_output->ddc_bus = intel_i2c_create(dev, GPIOA, "CRTDDC_A");
270         if (!intel_output->ddc_bus) {
271                 dev_printk(KERN_ERR, &dev->pdev->dev, "DDC bus registration "
272                            "failed.\n");
273                 return;
274         }
275
276         intel_output->type = INTEL_OUTPUT_ANALOG;
277         connector->interlace_allowed = 0;
278         connector->doublescan_allowed = 0;
279
280         drm_encoder_helper_add(&intel_output->enc, &intel_crt_helper_funcs);
281         drm_connector_helper_add(connector, &intel_crt_connector_helper_funcs);
282
283         drm_sysfs_connector_add(connector);
284 }