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drm/i915/hdmi: Add 'force_audio' property
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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/slab.h>
31 #include <linux/delay.h>
32 #include "drmP.h"
33 #include "drm.h"
34 #include "drm_crtc.h"
35 #include "drm_edid.h"
36 #include "intel_drv.h"
37 #include "i915_drm.h"
38 #include "i915_drv.h"
39
40 struct intel_hdmi {
41         struct intel_encoder base;
42         u32 sdvox_reg;
43         int ddc_bus;
44         bool has_hdmi_sink;
45         bool has_audio;
46         int force_audio;
47         struct drm_property *force_audio_property;
48 };
49
50 static struct intel_hdmi *enc_to_intel_hdmi(struct drm_encoder *encoder)
51 {
52         return container_of(encoder, struct intel_hdmi, base.base);
53 }
54
55 static struct intel_hdmi *intel_attached_hdmi(struct drm_connector *connector)
56 {
57         return container_of(intel_attached_encoder(connector),
58                             struct intel_hdmi, base);
59 }
60
61 static void intel_hdmi_mode_set(struct drm_encoder *encoder,
62                                 struct drm_display_mode *mode,
63                                 struct drm_display_mode *adjusted_mode)
64 {
65         struct drm_device *dev = encoder->dev;
66         struct drm_i915_private *dev_priv = dev->dev_private;
67         struct drm_crtc *crtc = encoder->crtc;
68         struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
69         struct intel_hdmi *intel_hdmi = enc_to_intel_hdmi(encoder);
70         u32 sdvox;
71
72         sdvox = SDVO_ENCODING_HDMI | SDVO_BORDER_ENABLE;
73         if (adjusted_mode->flags & DRM_MODE_FLAG_PVSYNC)
74                 sdvox |= SDVO_VSYNC_ACTIVE_HIGH;
75         if (adjusted_mode->flags & DRM_MODE_FLAG_PHSYNC)
76                 sdvox |= SDVO_HSYNC_ACTIVE_HIGH;
77
78         /* Required on CPT */
79         if (intel_hdmi->has_hdmi_sink && HAS_PCH_CPT(dev))
80                 sdvox |= HDMI_MODE_SELECT;
81
82         if (intel_hdmi->has_audio)
83                 sdvox |= SDVO_AUDIO_ENABLE;
84
85         if (intel_crtc->pipe == 1) {
86                 if (HAS_PCH_CPT(dev))
87                         sdvox |= PORT_TRANS_B_SEL_CPT;
88                 else
89                         sdvox |= SDVO_PIPE_B_SELECT;
90         }
91
92         I915_WRITE(intel_hdmi->sdvox_reg, sdvox);
93         POSTING_READ(intel_hdmi->sdvox_reg);
94 }
95
96 static void intel_hdmi_dpms(struct drm_encoder *encoder, int mode)
97 {
98         struct drm_device *dev = encoder->dev;
99         struct drm_i915_private *dev_priv = dev->dev_private;
100         struct intel_hdmi *intel_hdmi = enc_to_intel_hdmi(encoder);
101         u32 temp;
102
103         temp = I915_READ(intel_hdmi->sdvox_reg);
104
105         /* HW workaround, need to toggle enable bit off and on for 12bpc, but
106          * we do this anyway which shows more stable in testing.
107          */
108         if (HAS_PCH_SPLIT(dev)) {
109                 I915_WRITE(intel_hdmi->sdvox_reg, temp & ~SDVO_ENABLE);
110                 POSTING_READ(intel_hdmi->sdvox_reg);
111         }
112
113         if (mode != DRM_MODE_DPMS_ON) {
114                 temp &= ~SDVO_ENABLE;
115         } else {
116                 temp |= SDVO_ENABLE;
117         }
118
119         I915_WRITE(intel_hdmi->sdvox_reg, temp);
120         POSTING_READ(intel_hdmi->sdvox_reg);
121
122         /* HW workaround, need to write this twice for issue that may result
123          * in first write getting masked.
124          */
125         if (HAS_PCH_SPLIT(dev)) {
126                 I915_WRITE(intel_hdmi->sdvox_reg, temp);
127                 POSTING_READ(intel_hdmi->sdvox_reg);
128         }
129 }
130
131 static int intel_hdmi_mode_valid(struct drm_connector *connector,
132                                  struct drm_display_mode *mode)
133 {
134         if (mode->clock > 165000)
135                 return MODE_CLOCK_HIGH;
136         if (mode->clock < 20000)
137                 return MODE_CLOCK_HIGH;
138
139         if (mode->flags & DRM_MODE_FLAG_DBLSCAN)
140                 return MODE_NO_DBLESCAN;
141
142         return MODE_OK;
143 }
144
145 static bool intel_hdmi_mode_fixup(struct drm_encoder *encoder,
146                                   struct drm_display_mode *mode,
147                                   struct drm_display_mode *adjusted_mode)
148 {
149         return true;
150 }
151
152 static enum drm_connector_status
153 intel_hdmi_detect(struct drm_connector *connector, bool force)
154 {
155         struct intel_hdmi *intel_hdmi = intel_attached_hdmi(connector);
156         struct drm_i915_private *dev_priv = connector->dev->dev_private;
157         struct edid *edid;
158         enum drm_connector_status status = connector_status_disconnected;
159
160         intel_hdmi->has_hdmi_sink = false;
161         intel_hdmi->has_audio = false;
162         edid = drm_get_edid(connector,
163                             &dev_priv->gmbus[intel_hdmi->ddc_bus].adapter);
164
165         if (edid) {
166                 if (edid->input & DRM_EDID_INPUT_DIGITAL) {
167                         status = connector_status_connected;
168                         intel_hdmi->has_hdmi_sink = drm_detect_hdmi_monitor(edid);
169                         intel_hdmi->has_audio = drm_detect_monitor_audio(edid);
170                 }
171                 connector->display_info.raw_edid = NULL;
172                 kfree(edid);
173         }
174
175         if (status == connector_status_connected) {
176                 if (intel_hdmi->force_audio)
177                         intel_hdmi->has_audio = intel_hdmi->force_audio > 0;
178         }
179
180         return status;
181 }
182
183 static int intel_hdmi_get_modes(struct drm_connector *connector)
184 {
185         struct intel_hdmi *intel_hdmi = intel_attached_hdmi(connector);
186         struct drm_i915_private *dev_priv = connector->dev->dev_private;
187
188         /* We should parse the EDID data and find out if it's an HDMI sink so
189          * we can send audio to it.
190          */
191
192         return intel_ddc_get_modes(connector,
193                                    &dev_priv->gmbus[intel_hdmi->ddc_bus].adapter);
194 }
195
196 static int
197 intel_hdmi_set_property(struct drm_connector *connector,
198                       struct drm_property *property,
199                       uint64_t val)
200 {
201         struct intel_hdmi *intel_hdmi = intel_attached_hdmi(connector);
202         int ret;
203
204         ret = drm_connector_property_set_value(connector, property, val);
205         if (ret)
206                 return ret;
207
208         if (property == intel_hdmi->force_audio_property) {
209                 if (val == intel_hdmi->force_audio)
210                         return 0;
211
212                 intel_hdmi->force_audio = val;
213
214                 if (val > 0 && intel_hdmi->has_audio)
215                         return 0;
216                 if (val < 0 && !intel_hdmi->has_audio)
217                         return 0;
218
219                 intel_hdmi->has_audio = val > 0;
220                 goto done;
221         }
222
223         return -EINVAL;
224
225 done:
226         if (intel_hdmi->base.base.crtc) {
227                 struct drm_crtc *crtc = intel_hdmi->base.base.crtc;
228                 drm_crtc_helper_set_mode(crtc, &crtc->mode,
229                                          crtc->x, crtc->y,
230                                          crtc->fb);
231         }
232
233         return 0;
234 }
235
236 static void intel_hdmi_destroy(struct drm_connector *connector)
237 {
238         drm_sysfs_connector_remove(connector);
239         drm_connector_cleanup(connector);
240         kfree(connector);
241 }
242
243 static const struct drm_encoder_helper_funcs intel_hdmi_helper_funcs = {
244         .dpms = intel_hdmi_dpms,
245         .mode_fixup = intel_hdmi_mode_fixup,
246         .prepare = intel_encoder_prepare,
247         .mode_set = intel_hdmi_mode_set,
248         .commit = intel_encoder_commit,
249 };
250
251 static const struct drm_connector_funcs intel_hdmi_connector_funcs = {
252         .dpms = drm_helper_connector_dpms,
253         .detect = intel_hdmi_detect,
254         .fill_modes = drm_helper_probe_single_connector_modes,
255         .set_property = intel_hdmi_set_property,
256         .destroy = intel_hdmi_destroy,
257 };
258
259 static const struct drm_connector_helper_funcs intel_hdmi_connector_helper_funcs = {
260         .get_modes = intel_hdmi_get_modes,
261         .mode_valid = intel_hdmi_mode_valid,
262         .best_encoder = intel_best_encoder,
263 };
264
265 static const struct drm_encoder_funcs intel_hdmi_enc_funcs = {
266         .destroy = intel_encoder_destroy,
267 };
268
269 static void
270 intel_hdmi_add_properties(struct intel_hdmi *intel_hdmi, struct drm_connector *connector)
271 {
272         struct drm_device *dev = connector->dev;
273
274         intel_hdmi->force_audio_property =
275                 drm_property_create(dev, DRM_MODE_PROP_RANGE, "force_audio", 2);
276         if (intel_hdmi->force_audio_property) {
277                 intel_hdmi->force_audio_property->values[0] = -1;
278                 intel_hdmi->force_audio_property->values[1] = 1;
279                 drm_connector_attach_property(connector, intel_hdmi->force_audio_property, 0);
280         }
281 }
282
283 void intel_hdmi_init(struct drm_device *dev, int sdvox_reg)
284 {
285         struct drm_i915_private *dev_priv = dev->dev_private;
286         struct drm_connector *connector;
287         struct intel_encoder *intel_encoder;
288         struct intel_connector *intel_connector;
289         struct intel_hdmi *intel_hdmi;
290
291         intel_hdmi = kzalloc(sizeof(struct intel_hdmi), GFP_KERNEL);
292         if (!intel_hdmi)
293                 return;
294
295         intel_connector = kzalloc(sizeof(struct intel_connector), GFP_KERNEL);
296         if (!intel_connector) {
297                 kfree(intel_hdmi);
298                 return;
299         }
300
301         intel_encoder = &intel_hdmi->base;
302         drm_encoder_init(dev, &intel_encoder->base, &intel_hdmi_enc_funcs,
303                          DRM_MODE_ENCODER_TMDS);
304
305         connector = &intel_connector->base;
306         drm_connector_init(dev, connector, &intel_hdmi_connector_funcs,
307                            DRM_MODE_CONNECTOR_HDMIA);
308         drm_connector_helper_add(connector, &intel_hdmi_connector_helper_funcs);
309
310         intel_encoder->type = INTEL_OUTPUT_HDMI;
311
312         connector->polled = DRM_CONNECTOR_POLL_HPD;
313         connector->interlace_allowed = 0;
314         connector->doublescan_allowed = 0;
315         intel_encoder->crtc_mask = (1 << 0) | (1 << 1);
316
317         /* Set up the DDC bus. */
318         if (sdvox_reg == SDVOB) {
319                 intel_encoder->clone_mask = (1 << INTEL_HDMIB_CLONE_BIT);
320                 intel_hdmi->ddc_bus = GMBUS_PORT_DPB;
321                 dev_priv->hotplug_supported_mask |= HDMIB_HOTPLUG_INT_STATUS;
322         } else if (sdvox_reg == SDVOC) {
323                 intel_encoder->clone_mask = (1 << INTEL_HDMIC_CLONE_BIT);
324                 intel_hdmi->ddc_bus = GMBUS_PORT_DPC;
325                 dev_priv->hotplug_supported_mask |= HDMIC_HOTPLUG_INT_STATUS;
326         } else if (sdvox_reg == HDMIB) {
327                 intel_encoder->clone_mask = (1 << INTEL_HDMID_CLONE_BIT);
328                 intel_hdmi->ddc_bus = GMBUS_PORT_DPB;
329                 dev_priv->hotplug_supported_mask |= HDMIB_HOTPLUG_INT_STATUS;
330         } else if (sdvox_reg == HDMIC) {
331                 intel_encoder->clone_mask = (1 << INTEL_HDMIE_CLONE_BIT);
332                 intel_hdmi->ddc_bus = GMBUS_PORT_DPC;
333                 dev_priv->hotplug_supported_mask |= HDMIC_HOTPLUG_INT_STATUS;
334         } else if (sdvox_reg == HDMID) {
335                 intel_encoder->clone_mask = (1 << INTEL_HDMIF_CLONE_BIT);
336                 intel_hdmi->ddc_bus = GMBUS_PORT_DPD;
337                 dev_priv->hotplug_supported_mask |= HDMID_HOTPLUG_INT_STATUS;
338         }
339
340         intel_hdmi->sdvox_reg = sdvox_reg;
341
342         drm_encoder_helper_add(&intel_encoder->base, &intel_hdmi_helper_funcs);
343
344         intel_hdmi_add_properties(intel_hdmi, connector);
345
346         intel_connector_attach_encoder(intel_connector, intel_encoder);
347         drm_sysfs_connector_add(connector);
348
349         /* For G4X desktop chip, PEG_BAND_GAP_DATA 3:0 must first be written
350          * 0xd.  Failure to do so will result in spurious interrupts being
351          * generated on the port when a cable is not attached.
352          */
353         if (IS_G4X(dev) && !IS_GM45(dev)) {
354                 u32 temp = I915_READ(PEG_BAND_GAP_DATA);
355                 I915_WRITE(PEG_BAND_GAP_DATA, (temp & ~0xf) | 0xd);
356         }
357 }