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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 
intel_crt_dpms(struct drm_encoder * encoder,int mode)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 
intel_crt_mode_valid(struct drm_connector * connector,struct drm_display_mode * mode)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 
intel_crt_mode_fixup(struct drm_encoder * encoder,struct drm_display_mode * mode,struct drm_display_mode * adjusted_mode)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 
intel_crt_mode_set(struct drm_encoder * encoder,struct drm_display_mode * mode,struct drm_display_mode * adjusted_mode)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  */
intel_crt_detect_hotplug(struct drm_connector * connector)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 
intel_crt_detect_ddc(struct drm_connector * connector)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 
intel_crt_detect(struct drm_connector * connector)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 
intel_crt_destroy(struct drm_connector * connector)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 
intel_crt_get_modes(struct drm_connector * connector)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 
intel_crt_set_property(struct drm_connector * connector,struct drm_property * property,uint64_t value)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 
intel_crt_enc_destroy(struct drm_encoder * encoder)240 static 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 
intel_crt_init(struct drm_device * dev)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 }
285