aboutsummaryrefslogtreecommitdiffstats
path: root/drivers/gpu/drm/i915/intel_hdmi.c
blob: 1ed02f64125858f9c36acbf57564e6b485f045b2 (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
/*
 * Copyright 2006 Dave Airlie <airlied@linux.ie>
 * Copyright © 2006-2009 Intel Corporation
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation
 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 * and/or sell copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice (including the next
 * paragraph) shall be included in all copies or substantial portions of the
 * Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
 * DEALINGS IN THE SOFTWARE.
 *
 * Authors:
 *	Eric Anholt <eric@anholt.net>
 *	Jesse Barnes <jesse.barnes@intel.com>
 */

#include <linux/i2c.h>
#include <linux/slab.h>
#include <linux/delay.h>
#include "drmP.h"
#include "drm.h"
#include "drm_crtc.h"
#include "drm_edid.h"
#include "intel_drv.h"
#include "i915_drm.h"
#include "i915_drv.h"

struct intel_hdmi_priv {
	u32 sdvox_reg;
	u32 save_SDVOX;
	bool has_hdmi_sink;
};

static void intel_hdmi_mode_set(struct drm_encoder *encoder,
				struct drm_display_mode *mode,
				struct drm_display_mode *adjusted_mode)
{
	struct drm_device *dev = encoder->dev;
	struct drm_i915_private *dev_priv = dev->dev_private;
	struct drm_crtc *crtc = encoder->crtc;
	struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
	struct intel_output *intel_output = enc_to_intel_output(encoder);
	struct intel_hdmi_priv *hdmi_priv = intel_output->dev_priv;
	u32 sdvox;

	sdvox = SDVO_ENCODING_HDMI |
		SDVO_BORDER_ENABLE |
		SDVO_VSYNC_ACTIVE_HIGH |
		SDVO_HSYNC_ACTIVE_HIGH;

	if (hdmi_priv->has_hdmi_sink)
		sdvox |= SDVO_AUDIO_ENABLE;

	if (intel_crtc->pipe == 1)
		sdvox |= SDVO_PIPE_B_SELECT;

	I915_WRITE(hdmi_priv->sdvox_reg, sdvox);
	POSTING_READ(hdmi_priv->sdvox_reg);
}

static void intel_hdmi_dpms(struct drm_encoder *encoder, int mode)
{
	struct drm_device *dev = encoder->dev;
	struct drm_i915_private *dev_priv = dev->dev_private;
	struct intel_output *intel_output = enc_to_intel_output(encoder);
	struct intel_hdmi_priv *hdmi_priv = intel_output->dev_priv;
	u32 temp;

	temp = I915_READ(hdmi_priv->sdvox_reg);

	/* HW workaround, need to toggle enable bit off and on for 12bpc, but
	 * we do this anyway which shows more stable in testing.
	 */
	if (HAS_PCH_SPLIT(dev)) {
		I915_WRITE(hdmi_priv->sdvox_reg, temp & ~SDVO_ENABLE);
		POSTING_READ(hdmi_priv->sdvox_reg);
	}

	if (mode != DRM_MODE_DPMS_ON) {
		temp &= ~SDVO_ENABLE;
	} else {
		temp |= SDVO_ENABLE;
	}

	I915_WRITE(hdmi_priv->sdvox_reg, temp);
	POSTING_READ(hdmi_priv->sdvox_reg);

	/* HW workaround, need to write this twice for issue that may result
	 * in first write getting masked.
	 */
	if (HAS_PCH_SPLIT(dev)) {
		I915_WRITE(hdmi_priv->sdvox_reg, temp);
		POSTING_READ(hdmi_priv->sdvox_reg);
	}
}

static void intel_hdmi_save(struct drm_connector *connector)
{
	struct drm_device *dev = connector->dev;
	struct drm_i915_private *dev_priv = dev->dev_private;
	struct intel_output *intel_output = to_intel_output(connector);
	struct intel_hdmi_priv *hdmi_priv = intel_output->dev_priv;

	hdmi_priv->save_SDVOX = I915_READ(hdmi_priv->sdvox_reg);
}

static void intel_hdmi_restore(struct drm_connector *connector)
{
	struct drm_device *dev = connector->dev;
	struct drm_i915_private *dev_priv = dev->dev_private;
	struct intel_output *intel_output = to_intel_output(connector);
	struct intel_hdmi_priv *hdmi_priv = intel_output->dev_priv;

	I915_WRITE(hdmi_priv->sdvox_reg, hdmi_priv->save_SDVOX);
	POSTING_READ(hdmi_priv->sdvox_reg);
}

static int intel_hdmi_mode_valid(struct drm_connector *connector,
				 struct drm_display_mode *mode)
{
	if (mode->clock > 165000)
		return MODE_CLOCK_HIGH;
	if (mode->clock < 20000)
		return MODE_CLOCK_HIGH;

	if (mode->flags & DRM_MODE_FLAG_DBLSCAN)
		return MODE_NO_DBLESCAN;

	return MODE_OK;
}

static bool intel_hdmi_mode_fixup(struct drm_encoder *encoder,
				  struct drm_display_mode *mode,
				  struct drm_display_mode *adjusted_mode)
{
	return true;
}

static enum drm_connector_status
intel_hdmi_detect(struct drm_connector *connector)
{
	struct intel_output *intel_output = to_intel_output(connector);
	struct intel_hdmi_priv *hdmi_priv = intel_output->dev_priv;
	struct edid *edid = NULL;
	enum drm_connector_status status = connector_status_disconnected;

	hdmi_priv->has_hdmi_sink = false;
	edid = drm_get_edid(&intel_output->base,
			    intel_output->ddc_bus);

	if (edid) {
		if (edid->input & DRM_EDID_INPUT_DIGITAL) {
			status = connector_status_connected;
			hdmi_priv->has_hdmi_sink = drm_detect_hdmi_monitor(edid);
		}
		intel_output->base.display_info.raw_edid = NULL;
		kfree(edid);
	}

	return status;
}

static int intel_hdmi_get_modes(struct drm_connector *connector)
{
	struct intel_output *intel_output = to_intel_output(connector);

	/* We should parse the EDID data and find out if it's an HDMI sink so
	 * we can send audio to it.
	 */

	return intel_ddc_get_modes(intel_output);
}

static void intel_hdmi_destroy(struct drm_connector *connector)
{
	struct intel_output *intel_output = to_intel_output(connector);

	if (intel_output->i2c_bus)
		intel_i2c_destroy(intel_output->i2c_bus);
	drm_sysfs_connector_remove(connector);
	drm_connector_cleanup(connector);
	kfree(intel_output);
}

static const struct drm_encoder_helper_funcs intel_hdmi_helper_funcs = {
	.dpms = intel_hdmi_dpms,
	.mode_fixup = intel_hdmi_mode_fixup,
	.prepare = intel_encoder_prepare,
	.mode_set = intel_hdmi_mode_set,
	.commit = intel_encoder_commit,
};

static const struct drm_connector_funcs intel_hdmi_connector_funcs = {
	.dpms = drm_helper_connector_dpms,
	.save = intel_hdmi_save,
	.restore = intel_hdmi_restore,
	.detect = intel_hdmi_detect,
	.fill_modes = drm_helper_probe_single_connector_modes,
	.destroy = intel_hdmi_destroy,
};

static const struct drm_connector_helper_funcs intel_hdmi_connector_helper_funcs = {
	.get_modes = intel_hdmi_get_modes,
	.mode_valid = intel_hdmi_mode_valid,
	.best_encoder = intel_best_encoder,
};

static void intel_hdmi_enc_destroy(struct drm_encoder *encoder)
{
	drm_encoder_cleanup(encoder);
}

static const struct drm_encoder_funcs intel_hdmi_enc_funcs = {
	.destroy = intel_hdmi_enc_destroy,
};

void intel_hdmi_init(struct drm_device *dev, int sdvox_reg)
{
	struct drm_i915_private *dev_priv = dev->dev_private;
	struct drm_connector *connector;
	struct intel_output *intel_output;
	struct intel_hdmi_priv *hdmi_priv;

	intel_output = kcalloc(sizeof(struct intel_output) +
			       sizeof(struct intel_hdmi_priv), 1, GFP_KERNEL);
	if (!intel_output)
		return;
	hdmi_priv = (struct intel_hdmi_priv *)(intel_output + 1);

	connector = &intel_output->base;
	drm_connector_init(dev, connector, &intel_hdmi_connector_funcs,
			   DRM_MODE_CONNECTOR_HDMIA);
	drm_connector_helper_add(connector, &intel_hdmi_connector_helper_funcs);

	intel_output->type = INTEL_OUTPUT_HDMI;

	connector->interlace_allowed = 0;
	connector->doublescan_allowed = 0;
	intel_output->crtc_mask = (1 << 0) | (1 << 1);

	/* Set up the DDC bus. */
	if (sdvox_reg == SDVOB) {
		intel_output->clone_mask = (1 << INTEL_HDMIB_CLONE_BIT);
		intel_output->ddc_bus = intel_i2c_create(dev, GPIOE, "HDMIB");
		dev_priv->hotplug_supported_mask |= HDMIB_HOTPLUG_INT_STATUS;
	} else if (sdvox_reg == SDVOC) {
		intel_output->clone_mask = (1 << INTEL_HDMIC_CLONE_BIT);
		intel_output->ddc_bus = intel_i2c_create(dev, GPIOD, "HDMIC");
		dev_priv->hotplug_supported_mask |= HDMIC_HOTPLUG_INT_STATUS;
	} else if (sdvox_reg == HDMIB) {
		intel_output->clone_mask = (1 << INTEL_HDMID_CLONE_BIT);
		intel_output->ddc_bus = intel_i2c_create(dev, PCH_GPIOE,
								"HDMIB");
		dev_priv->hotplug_supported_mask |= HDMIB_HOTPLUG_INT_STATUS;
	} else if (sdvox_reg == HDMIC) {
		intel_output->clone_mask = (1 << INTEL_HDMIE_CLONE_BIT);
		intel_output->ddc_bus = intel_i2c_create(dev, PCH_GPIOD,
								"HDMIC");
		dev_priv->hotplug_supported_mask |= HDMIC_HOTPLUG_INT_STATUS;
	} else if (sdvox_reg == HDMID) {
		intel_output->clone_mask = (1 << INTEL_HDMIF_CLONE_BIT);
		intel_output->ddc_bus = intel_i2c_create(dev, PCH_GPIOF,
								"HDMID");
		dev_priv->hotplug_supported_mask |= HDMID_HOTPLUG_INT_STATUS;
	}
	if (!intel_output->ddc_bus)
		goto err_connector;

	hdmi_priv->sdvox_reg = sdvox_reg;
	intel_output->dev_priv = hdmi_priv;

	drm_encoder_init(dev, &intel_output->enc, &intel_hdmi_enc_funcs,
			 DRM_MODE_ENCODER_TMDS);
	drm_encoder_helper_add(&intel_output->enc, &intel_hdmi_helper_funcs);

	drm_mode_connector_attach_encoder(&intel_output->base,
					  &intel_output->enc);
	drm_sysfs_connector_add(connector);

	/* For G4X desktop chip, PEG_BAND_GAP_DATA 3:0 must first be written
	 * 0xd.  Failure to do so will result in spurious interrupts being
	 * generated on the port when a cable is not attached.
	 */
	if (IS_G4X(dev) && !IS_GM45(dev)) {
		u32 temp = I915_READ(PEG_BAND_GAP_DATA);
		I915_WRITE(PEG_BAND_GAP_DATA, (temp & ~0xf) | 0xd);
	}

	return;

err_connector:
	drm_connector_cleanup(connector);
	kfree(intel_output);

	return;
}