drm/i915: hdmi detection according by reading edid
[linux-3.10.git] / 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 "drm_edid.h"
35 #include "intel_drv.h"
36 #include "i915_drm.h"
37 #include "i915_drv.h"
38
39 struct intel_hdmi_priv {
40         u32 sdvox_reg;
41         u32 save_SDVOX;
42         bool has_hdmi_sink;
43 };
44
45 static void intel_hdmi_mode_set(struct drm_encoder *encoder,
46                                 struct drm_display_mode *mode,
47                                 struct drm_display_mode *adjusted_mode)
48 {
49         struct drm_device *dev = encoder->dev;
50         struct drm_i915_private *dev_priv = dev->dev_private;
51         struct drm_crtc *crtc = encoder->crtc;
52         struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
53         struct intel_output *intel_output = enc_to_intel_output(encoder);
54         struct intel_hdmi_priv *hdmi_priv = intel_output->dev_priv;
55         u32 sdvox;
56
57         sdvox = SDVO_ENCODING_HDMI |
58                 SDVO_BORDER_ENABLE |
59                 SDVO_VSYNC_ACTIVE_HIGH |
60                 SDVO_HSYNC_ACTIVE_HIGH;
61
62         if (hdmi_priv->has_hdmi_sink)
63                 sdvox |= SDVO_AUDIO_ENABLE;
64
65         if (intel_crtc->pipe == 1)
66                 sdvox |= SDVO_PIPE_B_SELECT;
67
68         I915_WRITE(hdmi_priv->sdvox_reg, sdvox);
69         POSTING_READ(hdmi_priv->sdvox_reg);
70 }
71
72 static void intel_hdmi_dpms(struct drm_encoder *encoder, int mode)
73 {
74         struct drm_device *dev = encoder->dev;
75         struct drm_i915_private *dev_priv = dev->dev_private;
76         struct intel_output *intel_output = enc_to_intel_output(encoder);
77         struct intel_hdmi_priv *hdmi_priv = intel_output->dev_priv;
78         u32 temp;
79
80         if (mode != DRM_MODE_DPMS_ON) {
81                 temp = I915_READ(hdmi_priv->sdvox_reg);
82                 I915_WRITE(hdmi_priv->sdvox_reg, temp & ~SDVO_ENABLE);
83         } else {
84                 temp = I915_READ(hdmi_priv->sdvox_reg);
85                 I915_WRITE(hdmi_priv->sdvox_reg, temp | SDVO_ENABLE);
86         }
87         POSTING_READ(hdmi_priv->sdvox_reg);
88 }
89
90 static void intel_hdmi_save(struct drm_connector *connector)
91 {
92         struct drm_device *dev = connector->dev;
93         struct drm_i915_private *dev_priv = dev->dev_private;
94         struct intel_output *intel_output = to_intel_output(connector);
95         struct intel_hdmi_priv *hdmi_priv = intel_output->dev_priv;
96
97         hdmi_priv->save_SDVOX = I915_READ(hdmi_priv->sdvox_reg);
98 }
99
100 static void intel_hdmi_restore(struct drm_connector *connector)
101 {
102         struct drm_device *dev = connector->dev;
103         struct drm_i915_private *dev_priv = dev->dev_private;
104         struct intel_output *intel_output = to_intel_output(connector);
105         struct intel_hdmi_priv *hdmi_priv = intel_output->dev_priv;
106
107         I915_WRITE(hdmi_priv->sdvox_reg, hdmi_priv->save_SDVOX);
108         POSTING_READ(hdmi_priv->sdvox_reg);
109 }
110
111 static int intel_hdmi_mode_valid(struct drm_connector *connector,
112                                  struct drm_display_mode *mode)
113 {
114         if (mode->clock > 165000)
115                 return MODE_CLOCK_HIGH;
116         if (mode->clock < 20000)
117                 return MODE_CLOCK_HIGH;
118
119         if (mode->flags & DRM_MODE_FLAG_DBLSCAN)
120                 return MODE_NO_DBLESCAN;
121
122         return MODE_OK;
123 }
124
125 static bool intel_hdmi_mode_fixup(struct drm_encoder *encoder,
126                                   struct drm_display_mode *mode,
127                                   struct drm_display_mode *adjusted_mode)
128 {
129         return true;
130 }
131
132 static enum drm_connector_status
133 intel_hdmi_detect(struct drm_connector *connector)
134 {
135         struct intel_output *intel_output = to_intel_output(connector);
136         struct intel_hdmi_priv *hdmi_priv = intel_output->dev_priv;
137         struct edid *edid = NULL;
138         enum drm_connector_status status = connector_status_disconnected;
139
140         hdmi_priv->has_hdmi_sink = false;
141         edid = drm_get_edid(&intel_output->base,
142                             intel_output->ddc_bus);
143
144         if (edid) {
145                 if (edid->input & DRM_EDID_INPUT_DIGITAL) {
146                         status = connector_status_connected;
147                         hdmi_priv->has_hdmi_sink = drm_detect_hdmi_monitor(edid);
148                 }
149                 intel_output->base.display_info.raw_edid = NULL;
150                 kfree(edid);
151         }
152
153         return status;
154 }
155
156 static int intel_hdmi_get_modes(struct drm_connector *connector)
157 {
158         struct intel_output *intel_output = to_intel_output(connector);
159
160         /* We should parse the EDID data and find out if it's an HDMI sink so
161          * we can send audio to it.
162          */
163
164         return intel_ddc_get_modes(intel_output);
165 }
166
167 static void intel_hdmi_destroy(struct drm_connector *connector)
168 {
169         struct intel_output *intel_output = to_intel_output(connector);
170
171         if (intel_output->i2c_bus)
172                 intel_i2c_destroy(intel_output->i2c_bus);
173         drm_sysfs_connector_remove(connector);
174         drm_connector_cleanup(connector);
175         kfree(intel_output);
176 }
177
178 static const struct drm_encoder_helper_funcs intel_hdmi_helper_funcs = {
179         .dpms = intel_hdmi_dpms,
180         .mode_fixup = intel_hdmi_mode_fixup,
181         .prepare = intel_encoder_prepare,
182         .mode_set = intel_hdmi_mode_set,
183         .commit = intel_encoder_commit,
184 };
185
186 static const struct drm_connector_funcs intel_hdmi_connector_funcs = {
187         .dpms = drm_helper_connector_dpms,
188         .save = intel_hdmi_save,
189         .restore = intel_hdmi_restore,
190         .detect = intel_hdmi_detect,
191         .fill_modes = drm_helper_probe_single_connector_modes,
192         .destroy = intel_hdmi_destroy,
193 };
194
195 static const struct drm_connector_helper_funcs intel_hdmi_connector_helper_funcs = {
196         .get_modes = intel_hdmi_get_modes,
197         .mode_valid = intel_hdmi_mode_valid,
198         .best_encoder = intel_best_encoder,
199 };
200
201 static void intel_hdmi_enc_destroy(struct drm_encoder *encoder)
202 {
203         drm_encoder_cleanup(encoder);
204 }
205
206 static const struct drm_encoder_funcs intel_hdmi_enc_funcs = {
207         .destroy = intel_hdmi_enc_destroy,
208 };
209
210
211 void intel_hdmi_init(struct drm_device *dev, int sdvox_reg)
212 {
213         struct drm_i915_private *dev_priv = dev->dev_private;
214         struct drm_connector *connector;
215         struct intel_output *intel_output;
216         struct intel_hdmi_priv *hdmi_priv;
217
218         intel_output = kcalloc(sizeof(struct intel_output) +
219                                sizeof(struct intel_hdmi_priv), 1, GFP_KERNEL);
220         if (!intel_output)
221                 return;
222         hdmi_priv = (struct intel_hdmi_priv *)(intel_output + 1);
223
224         connector = &intel_output->base;
225         drm_connector_init(dev, connector, &intel_hdmi_connector_funcs,
226                            DRM_MODE_CONNECTOR_DVID);
227         drm_connector_helper_add(connector, &intel_hdmi_connector_helper_funcs);
228
229         intel_output->type = INTEL_OUTPUT_HDMI;
230
231         connector->interlace_allowed = 0;
232         connector->doublescan_allowed = 0;
233
234         /* Set up the DDC bus. */
235         if (sdvox_reg == SDVOB)
236                 intel_output->ddc_bus = intel_i2c_create(dev, GPIOE, "HDMIB");
237         else if (sdvox_reg == SDVOC)
238                 intel_output->ddc_bus = intel_i2c_create(dev, GPIOD, "HDMIC");
239         else if (sdvox_reg == HDMIB)
240                 intel_output->ddc_bus = intel_i2c_create(dev, PCH_GPIOE,
241                                                                 "HDMIB");
242         else if (sdvox_reg == HDMIC)
243                 intel_output->ddc_bus = intel_i2c_create(dev, PCH_GPIOD,
244                                                                 "HDMIC");
245         else if (sdvox_reg == HDMID)
246                 intel_output->ddc_bus = intel_i2c_create(dev, PCH_GPIOF,
247                                                                 "HDMID");
248
249         if (!intel_output->ddc_bus)
250                 goto err_connector;
251
252         hdmi_priv->sdvox_reg = sdvox_reg;
253         intel_output->dev_priv = hdmi_priv;
254
255         drm_encoder_init(dev, &intel_output->enc, &intel_hdmi_enc_funcs,
256                          DRM_MODE_ENCODER_TMDS);
257         drm_encoder_helper_add(&intel_output->enc, &intel_hdmi_helper_funcs);
258
259         drm_mode_connector_attach_encoder(&intel_output->base,
260                                           &intel_output->enc);
261         drm_sysfs_connector_add(connector);
262
263         /* For G4X desktop chip, PEG_BAND_GAP_DATA 3:0 must first be written
264          * 0xd.  Failure to do so will result in spurious interrupts being
265          * generated on the port when a cable is not attached.
266          */
267         if (IS_G4X(dev) && !IS_GM45(dev)) {
268                 u32 temp = I915_READ(PEG_BAND_GAP_DATA);
269                 I915_WRITE(PEG_BAND_GAP_DATA, (temp & ~0xf) | 0xd);
270         }
271
272         return;
273
274 err_connector:
275         drm_connector_cleanup(connector);
276         kfree(intel_output);
277
278         return;
279 }