Merge git://git.kernel.org/pub/scm/linux/kernel/git/mason/btrfs-unstable
[linux-2.6] / drivers / gpu / drm / i915 / intel_hdmi.c
1 /*
2  * Copyright 2006 Dave Airlie <airlied@linux.ie>
3  * Copyright © 2006-2009 Intel Corporation
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  *      Jesse Barnes <jesse.barnes@intel.com>
27  */
28
29 #include <linux/i2c.h>
30 #include <linux/delay.h>
31 #include "drmP.h"
32 #include "drm.h"
33 #include "drm_crtc.h"
34 #include "intel_drv.h"
35 #include "i915_drm.h"
36 #include "i915_drv.h"
37
38 struct intel_hdmi_priv {
39         u32 sdvox_reg;
40         u32 save_SDVOX;
41         int has_hdmi_sink;
42 };
43
44 static void intel_hdmi_mode_set(struct drm_encoder *encoder,
45                                 struct drm_display_mode *mode,
46                                 struct drm_display_mode *adjusted_mode)
47 {
48         struct drm_device *dev = encoder->dev;
49         struct drm_i915_private *dev_priv = dev->dev_private;
50         struct drm_crtc *crtc = encoder->crtc;
51         struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
52         struct intel_output *intel_output = enc_to_intel_output(encoder);
53         struct intel_hdmi_priv *hdmi_priv = intel_output->dev_priv;
54         u32 sdvox;
55
56         sdvox = SDVO_ENCODING_HDMI |
57                 SDVO_BORDER_ENABLE |
58                 SDVO_VSYNC_ACTIVE_HIGH |
59                 SDVO_HSYNC_ACTIVE_HIGH;
60
61         if (hdmi_priv->has_hdmi_sink)
62                 sdvox |= SDVO_AUDIO_ENABLE;
63
64         if (intel_crtc->pipe == 1)
65                 sdvox |= SDVO_PIPE_B_SELECT;
66
67         I915_WRITE(hdmi_priv->sdvox_reg, sdvox);
68         POSTING_READ(hdmi_priv->sdvox_reg);
69 }
70
71 static void intel_hdmi_dpms(struct drm_encoder *encoder, int mode)
72 {
73         struct drm_device *dev = encoder->dev;
74         struct drm_i915_private *dev_priv = dev->dev_private;
75         struct intel_output *intel_output = enc_to_intel_output(encoder);
76         struct intel_hdmi_priv *hdmi_priv = intel_output->dev_priv;
77         u32 temp;
78
79         if (mode != DRM_MODE_DPMS_ON) {
80                 temp = I915_READ(hdmi_priv->sdvox_reg);
81                 I915_WRITE(hdmi_priv->sdvox_reg, temp & ~SDVO_ENABLE);
82         } else {
83                 temp = I915_READ(hdmi_priv->sdvox_reg);
84                 I915_WRITE(hdmi_priv->sdvox_reg, temp | SDVO_ENABLE);
85         }
86         POSTING_READ(hdmi_priv->sdvox_reg);
87 }
88
89 static void intel_hdmi_save(struct drm_connector *connector)
90 {
91         struct drm_device *dev = connector->dev;
92         struct drm_i915_private *dev_priv = dev->dev_private;
93         struct intel_output *intel_output = to_intel_output(connector);
94         struct intel_hdmi_priv *hdmi_priv = intel_output->dev_priv;
95
96         hdmi_priv->save_SDVOX = I915_READ(hdmi_priv->sdvox_reg);
97 }
98
99 static void intel_hdmi_restore(struct drm_connector *connector)
100 {
101         struct drm_device *dev = connector->dev;
102         struct drm_i915_private *dev_priv = dev->dev_private;
103         struct intel_output *intel_output = to_intel_output(connector);
104         struct intel_hdmi_priv *hdmi_priv = intel_output->dev_priv;
105
106         I915_WRITE(hdmi_priv->sdvox_reg, hdmi_priv->save_SDVOX);
107         POSTING_READ(hdmi_priv->sdvox_reg);
108 }
109
110 static int intel_hdmi_mode_valid(struct drm_connector *connector,
111                                  struct drm_display_mode *mode)
112 {
113         if (mode->clock > 165000)
114                 return MODE_CLOCK_HIGH;
115         if (mode->clock < 20000)
116                 return MODE_CLOCK_HIGH;
117
118         if (mode->flags & DRM_MODE_FLAG_DBLSCAN)
119                 return MODE_NO_DBLESCAN;
120
121         return MODE_OK;
122 }
123
124 static bool intel_hdmi_mode_fixup(struct drm_encoder *encoder,
125                                   struct drm_display_mode *mode,
126                                   struct drm_display_mode *adjusted_mode)
127 {
128         return true;
129 }
130
131 static enum drm_connector_status
132 intel_hdmi_detect(struct drm_connector *connector)
133 {
134         struct drm_device *dev = connector->dev;
135         struct drm_i915_private *dev_priv = dev->dev_private;
136         struct intel_output *intel_output = to_intel_output(connector);
137         struct intel_hdmi_priv *hdmi_priv = intel_output->dev_priv;
138         u32 temp, bit;
139
140         temp = I915_READ(PORT_HOTPLUG_EN);
141
142         I915_WRITE(PORT_HOTPLUG_EN,
143                    temp |
144                    HDMIB_HOTPLUG_INT_EN |
145                    HDMIC_HOTPLUG_INT_EN |
146                    HDMID_HOTPLUG_INT_EN);
147
148         POSTING_READ(PORT_HOTPLUG_EN);
149
150         switch (hdmi_priv->sdvox_reg) {
151         case SDVOB:
152                 bit = HDMIB_HOTPLUG_INT_STATUS;
153                 break;
154         case SDVOC:
155                 bit = HDMIC_HOTPLUG_INT_STATUS;
156                 break;
157         default:
158                 return connector_status_unknown;
159         }
160
161         if ((I915_READ(PORT_HOTPLUG_STAT) & bit) != 0)
162                 return connector_status_connected;
163         else
164                 return connector_status_disconnected;
165 }
166
167 static int intel_hdmi_get_modes(struct drm_connector *connector)
168 {
169         struct intel_output *intel_output = to_intel_output(connector);
170
171         /* We should parse the EDID data and find out if it's an HDMI sink so
172          * we can send audio to it.
173          */
174
175         return intel_ddc_get_modes(intel_output);
176 }
177
178 static void intel_hdmi_destroy(struct drm_connector *connector)
179 {
180         struct intel_output *intel_output = to_intel_output(connector);
181
182         if (intel_output->i2c_bus)
183                 intel_i2c_destroy(intel_output->i2c_bus);
184         drm_sysfs_connector_remove(connector);
185         drm_connector_cleanup(connector);
186         kfree(intel_output);
187 }
188
189 static const struct drm_encoder_helper_funcs intel_hdmi_helper_funcs = {
190         .dpms = intel_hdmi_dpms,
191         .mode_fixup = intel_hdmi_mode_fixup,
192         .prepare = intel_encoder_prepare,
193         .mode_set = intel_hdmi_mode_set,
194         .commit = intel_encoder_commit,
195 };
196
197 static const struct drm_connector_funcs intel_hdmi_connector_funcs = {
198         .save = intel_hdmi_save,
199         .restore = intel_hdmi_restore,
200         .detect = intel_hdmi_detect,
201         .fill_modes = drm_helper_probe_single_connector_modes,
202         .destroy = intel_hdmi_destroy,
203 };
204
205 static const struct drm_connector_helper_funcs intel_hdmi_connector_helper_funcs = {
206         .get_modes = intel_hdmi_get_modes,
207         .mode_valid = intel_hdmi_mode_valid,
208         .best_encoder = intel_best_encoder,
209 };
210
211 static void intel_hdmi_enc_destroy(struct drm_encoder *encoder)
212 {
213         drm_encoder_cleanup(encoder);
214 }
215
216 static const struct drm_encoder_funcs intel_hdmi_enc_funcs = {
217         .destroy = intel_hdmi_enc_destroy,
218 };
219
220
221 void intel_hdmi_init(struct drm_device *dev, int sdvox_reg)
222 {
223         struct drm_i915_private *dev_priv = dev->dev_private;
224         struct drm_connector *connector;
225         struct intel_output *intel_output;
226         struct intel_hdmi_priv *hdmi_priv;
227
228         intel_output = kcalloc(sizeof(struct intel_output) +
229                                sizeof(struct intel_hdmi_priv), 1, GFP_KERNEL);
230         if (!intel_output)
231                 return;
232         hdmi_priv = (struct intel_hdmi_priv *)(intel_output + 1);
233
234         connector = &intel_output->base;
235         drm_connector_init(dev, connector, &intel_hdmi_connector_funcs,
236                            DRM_MODE_CONNECTOR_DVID);
237         drm_connector_helper_add(connector, &intel_hdmi_connector_helper_funcs);
238
239         intel_output->type = INTEL_OUTPUT_HDMI;
240
241         connector->interlace_allowed = 0;
242         connector->doublescan_allowed = 0;
243
244         /* Set up the DDC bus. */
245         if (sdvox_reg == SDVOB)
246                 intel_output->ddc_bus = intel_i2c_create(dev, GPIOE, "HDMIB");
247         else
248                 intel_output->ddc_bus = intel_i2c_create(dev, GPIOD, "HDMIC");
249
250         if (!intel_output->ddc_bus)
251                 goto err_connector;
252
253         hdmi_priv->sdvox_reg = sdvox_reg;
254         intel_output->dev_priv = hdmi_priv;
255
256         drm_encoder_init(dev, &intel_output->enc, &intel_hdmi_enc_funcs,
257                          DRM_MODE_ENCODER_TMDS);
258         drm_encoder_helper_add(&intel_output->enc, &intel_hdmi_helper_funcs);
259
260         drm_mode_connector_attach_encoder(&intel_output->base,
261                                           &intel_output->enc);
262         drm_sysfs_connector_add(connector);
263
264         /* For G4X desktop chip, PEG_BAND_GAP_DATA 3:0 must first be written
265          * 0xd.  Failure to do so will result in spurious interrupts being
266          * generated on the port when a cable is not attached.
267          */
268         if (IS_G4X(dev) && !IS_GM45(dev)) {
269                 u32 temp = I915_READ(PEG_BAND_GAP_DATA);
270                 I915_WRITE(PEG_BAND_GAP_DATA, (temp & ~0xf) | 0xd);
271         }
272
273         return;
274
275 err_connector:
276         drm_connector_cleanup(connector);
277         kfree(intel_output);
278
279         return;
280 }