1 /*
2  * Copyright © 2006-2011 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  *	jim liu <jim.liu@intel.com>
25  *
26  * FIXME:
27  *	We should probably make this generic and share it with Medfield
28  */
29 
30 #include <linux/pm_runtime.h>
31 
32 #include <drm/drm.h>
33 #include <drm/drm_crtc.h>
34 #include <drm/drm_edid.h>
35 
36 #include "cdv_device.h"
37 #include "psb_drv.h"
38 #include "psb_intel_drv.h"
39 #include "psb_intel_reg.h"
40 
41 /* hdmi control bits */
42 #define HDMI_NULL_PACKETS_DURING_VSYNC	(1 << 9)
43 #define HDMI_BORDER_ENABLE		(1 << 7)
44 #define HDMI_AUDIO_ENABLE		(1 << 6)
45 #define HDMI_VSYNC_ACTIVE_HIGH		(1 << 4)
46 #define HDMI_HSYNC_ACTIVE_HIGH		(1 << 3)
47 /* hdmi-b control bits */
48 #define	HDMIB_PIPE_B_SELECT		(1 << 30)
49 
50 
51 struct mid_intel_hdmi_priv {
52 	u32 hdmi_reg;
53 	u32 save_HDMIB;
54 	bool has_hdmi_sink;
55 	bool has_hdmi_audio;
56 	/* Should set this when detect hotplug */
57 	bool hdmi_device_connected;
58 	struct mdfld_hdmi_i2c *i2c_bus;
59 	struct i2c_adapter *hdmi_i2c_adapter;	/* for control functions */
60 	struct drm_device *dev;
61 };
62 
63 static void cdv_hdmi_mode_set(struct drm_encoder *encoder,
64 			struct drm_display_mode *mode,
65 			struct drm_display_mode *adjusted_mode)
66 {
67 	struct drm_device *dev = encoder->dev;
68 	struct gma_encoder *gma_encoder = to_gma_encoder(encoder);
69 	struct mid_intel_hdmi_priv *hdmi_priv = gma_encoder->dev_priv;
70 	u32 hdmib;
71 	struct drm_crtc *crtc = encoder->crtc;
72 	struct gma_crtc *gma_crtc = to_gma_crtc(crtc);
73 
74 	hdmib = (2 << 10);
75 
76 	if (adjusted_mode->flags & DRM_MODE_FLAG_PVSYNC)
77 		hdmib |= HDMI_VSYNC_ACTIVE_HIGH;
78 	if (adjusted_mode->flags & DRM_MODE_FLAG_PHSYNC)
79 		hdmib |= HDMI_HSYNC_ACTIVE_HIGH;
80 
81 	if (gma_crtc->pipe == 1)
82 		hdmib |= HDMIB_PIPE_B_SELECT;
83 
84 	if (hdmi_priv->has_hdmi_audio) {
85 		hdmib |= HDMI_AUDIO_ENABLE;
86 		hdmib |= HDMI_NULL_PACKETS_DURING_VSYNC;
87 	}
88 
89 	REG_WRITE(hdmi_priv->hdmi_reg, hdmib);
90 	REG_READ(hdmi_priv->hdmi_reg);
91 }
92 
93 static void cdv_hdmi_dpms(struct drm_encoder *encoder, int mode)
94 {
95 	struct drm_device *dev = encoder->dev;
96 	struct gma_encoder *gma_encoder = to_gma_encoder(encoder);
97 	struct mid_intel_hdmi_priv *hdmi_priv = gma_encoder->dev_priv;
98 	u32 hdmib;
99 
100 	hdmib = REG_READ(hdmi_priv->hdmi_reg);
101 
102 	if (mode != DRM_MODE_DPMS_ON)
103 		REG_WRITE(hdmi_priv->hdmi_reg, hdmib & ~HDMIB_PORT_EN);
104 	else
105 		REG_WRITE(hdmi_priv->hdmi_reg, hdmib | HDMIB_PORT_EN);
106 	REG_READ(hdmi_priv->hdmi_reg);
107 }
108 
109 static void cdv_hdmi_save(struct drm_connector *connector)
110 {
111 	struct drm_device *dev = connector->dev;
112 	struct gma_encoder *gma_encoder = gma_attached_encoder(connector);
113 	struct mid_intel_hdmi_priv *hdmi_priv = gma_encoder->dev_priv;
114 
115 	hdmi_priv->save_HDMIB = REG_READ(hdmi_priv->hdmi_reg);
116 }
117 
118 static void cdv_hdmi_restore(struct drm_connector *connector)
119 {
120 	struct drm_device *dev = connector->dev;
121 	struct gma_encoder *gma_encoder = gma_attached_encoder(connector);
122 	struct mid_intel_hdmi_priv *hdmi_priv = gma_encoder->dev_priv;
123 
124 	REG_WRITE(hdmi_priv->hdmi_reg, hdmi_priv->save_HDMIB);
125 	REG_READ(hdmi_priv->hdmi_reg);
126 }
127 
128 static enum drm_connector_status cdv_hdmi_detect(
129 				struct drm_connector *connector, bool force)
130 {
131 	struct gma_encoder *gma_encoder = gma_attached_encoder(connector);
132 	struct mid_intel_hdmi_priv *hdmi_priv = gma_encoder->dev_priv;
133 	struct edid *edid = NULL;
134 	enum drm_connector_status status = connector_status_disconnected;
135 
136 	edid = drm_get_edid(connector, &gma_encoder->i2c_bus->adapter);
137 
138 	hdmi_priv->has_hdmi_sink = false;
139 	hdmi_priv->has_hdmi_audio = false;
140 	if (edid) {
141 		if (edid->input & DRM_EDID_INPUT_DIGITAL) {
142 			status = connector_status_connected;
143 			hdmi_priv->has_hdmi_sink =
144 						drm_detect_hdmi_monitor(edid);
145 			hdmi_priv->has_hdmi_audio =
146 						drm_detect_monitor_audio(edid);
147 		}
148 		kfree(edid);
149 	}
150 	return status;
151 }
152 
153 static int cdv_hdmi_set_property(struct drm_connector *connector,
154 				       struct drm_property *property,
155 				       uint64_t value)
156 {
157 	struct drm_encoder *encoder = connector->encoder;
158 
159 	if (!strcmp(property->name, "scaling mode") && encoder) {
160 		struct gma_crtc *crtc = to_gma_crtc(encoder->crtc);
161 		bool centre;
162 		uint64_t curValue;
163 
164 		if (!crtc)
165 			return -1;
166 
167 		switch (value) {
168 		case DRM_MODE_SCALE_FULLSCREEN:
169 			break;
170 		case DRM_MODE_SCALE_NO_SCALE:
171 			break;
172 		case DRM_MODE_SCALE_ASPECT:
173 			break;
174 		default:
175 			return -1;
176 		}
177 
178 		if (drm_object_property_get_value(&connector->base,
179 							property, &curValue))
180 			return -1;
181 
182 		if (curValue == value)
183 			return 0;
184 
185 		if (drm_object_property_set_value(&connector->base,
186 							property, value))
187 			return -1;
188 
189 		centre = (curValue == DRM_MODE_SCALE_NO_SCALE) ||
190 			(value == DRM_MODE_SCALE_NO_SCALE);
191 
192 		if (crtc->saved_mode.hdisplay != 0 &&
193 		    crtc->saved_mode.vdisplay != 0) {
194 			if (centre) {
195 				if (!drm_crtc_helper_set_mode(encoder->crtc, &crtc->saved_mode,
196 					    encoder->crtc->x, encoder->crtc->y, encoder->crtc->primary->fb))
197 					return -1;
198 			} else {
199 				const struct drm_encoder_helper_funcs *helpers
200 						    = encoder->helper_private;
201 				helpers->mode_set(encoder, &crtc->saved_mode,
202 					     &crtc->saved_adjusted_mode);
203 			}
204 		}
205 	}
206 	return 0;
207 }
208 
209 /*
210  * Return the list of HDMI DDC modes if available.
211  */
212 static int cdv_hdmi_get_modes(struct drm_connector *connector)
213 {
214 	struct gma_encoder *gma_encoder = gma_attached_encoder(connector);
215 	struct edid *edid = NULL;
216 	int ret = 0;
217 
218 	edid = drm_get_edid(connector, &gma_encoder->i2c_bus->adapter);
219 	if (edid) {
220 		drm_connector_update_edid_property(connector, edid);
221 		ret = drm_add_edid_modes(connector, edid);
222 		kfree(edid);
223 	}
224 	return ret;
225 }
226 
227 static enum drm_mode_status cdv_hdmi_mode_valid(struct drm_connector *connector,
228 				 struct drm_display_mode *mode)
229 {
230 	if (mode->clock > 165000)
231 		return MODE_CLOCK_HIGH;
232 	if (mode->clock < 20000)
233 		return MODE_CLOCK_HIGH;
234 
235 	/* just in case */
236 	if (mode->flags & DRM_MODE_FLAG_DBLSCAN)
237 		return MODE_NO_DBLESCAN;
238 
239 	/* just in case */
240 	if (mode->flags & DRM_MODE_FLAG_INTERLACE)
241 		return MODE_NO_INTERLACE;
242 
243 	return MODE_OK;
244 }
245 
246 static void cdv_hdmi_destroy(struct drm_connector *connector)
247 {
248 	struct gma_encoder *gma_encoder = gma_attached_encoder(connector);
249 
250 	psb_intel_i2c_destroy(gma_encoder->i2c_bus);
251 	drm_connector_unregister(connector);
252 	drm_connector_cleanup(connector);
253 	kfree(connector);
254 }
255 
256 static const struct drm_encoder_helper_funcs cdv_hdmi_helper_funcs = {
257 	.dpms = cdv_hdmi_dpms,
258 	.prepare = gma_encoder_prepare,
259 	.mode_set = cdv_hdmi_mode_set,
260 	.commit = gma_encoder_commit,
261 };
262 
263 static const struct drm_connector_helper_funcs
264 					cdv_hdmi_connector_helper_funcs = {
265 	.get_modes = cdv_hdmi_get_modes,
266 	.mode_valid = cdv_hdmi_mode_valid,
267 	.best_encoder = gma_best_encoder,
268 };
269 
270 static const struct drm_connector_funcs cdv_hdmi_connector_funcs = {
271 	.dpms = drm_helper_connector_dpms,
272 	.detect = cdv_hdmi_detect,
273 	.fill_modes = drm_helper_probe_single_connector_modes,
274 	.set_property = cdv_hdmi_set_property,
275 	.destroy = cdv_hdmi_destroy,
276 };
277 
278 void cdv_hdmi_init(struct drm_device *dev,
279 			struct psb_intel_mode_device *mode_dev, int reg)
280 {
281 	struct gma_encoder *gma_encoder;
282 	struct gma_connector *gma_connector;
283 	struct drm_connector *connector;
284 	struct drm_encoder *encoder;
285 	struct mid_intel_hdmi_priv *hdmi_priv;
286 	int ddc_bus;
287 
288 	gma_encoder = kzalloc(sizeof(struct gma_encoder), GFP_KERNEL);
289 
290 	if (!gma_encoder)
291 		return;
292 
293 	gma_connector = kzalloc(sizeof(struct gma_connector),
294 				      GFP_KERNEL);
295 
296 	if (!gma_connector)
297 		goto err_connector;
298 
299 	hdmi_priv = kzalloc(sizeof(struct mid_intel_hdmi_priv), GFP_KERNEL);
300 
301 	if (!hdmi_priv)
302 		goto err_priv;
303 
304 	connector = &gma_connector->base;
305 	connector->polled = DRM_CONNECTOR_POLL_HPD;
306 	gma_connector->save = cdv_hdmi_save;
307 	gma_connector->restore = cdv_hdmi_restore;
308 
309 	encoder = &gma_encoder->base;
310 	drm_connector_init(dev, connector,
311 			   &cdv_hdmi_connector_funcs,
312 			   DRM_MODE_CONNECTOR_DVID);
313 
314 	drm_encoder_init(dev, encoder, &psb_intel_lvds_enc_funcs,
315 			 DRM_MODE_ENCODER_TMDS, NULL);
316 
317 	gma_connector_attach_encoder(gma_connector, gma_encoder);
318 	gma_encoder->type = INTEL_OUTPUT_HDMI;
319 	hdmi_priv->hdmi_reg = reg;
320 	hdmi_priv->has_hdmi_sink = false;
321 	gma_encoder->dev_priv = hdmi_priv;
322 
323 	drm_encoder_helper_add(encoder, &cdv_hdmi_helper_funcs);
324 	drm_connector_helper_add(connector,
325 				 &cdv_hdmi_connector_helper_funcs);
326 	connector->display_info.subpixel_order = SubPixelHorizontalRGB;
327 	connector->interlace_allowed = false;
328 	connector->doublescan_allowed = false;
329 
330 	drm_object_attach_property(&connector->base,
331 				      dev->mode_config.scaling_mode_property,
332 				      DRM_MODE_SCALE_FULLSCREEN);
333 
334 	switch (reg) {
335 	case SDVOB:
336 		ddc_bus = GPIOE;
337 		gma_encoder->ddi_select = DDI0_SELECT;
338 		break;
339 	case SDVOC:
340 		ddc_bus = GPIOD;
341 		gma_encoder->ddi_select = DDI1_SELECT;
342 		break;
343 	default:
344 		DRM_ERROR("unknown reg 0x%x for HDMI\n", reg);
345 		goto failed_ddc;
346 		break;
347 	}
348 
349 	gma_encoder->i2c_bus = psb_intel_i2c_create(dev,
350 				ddc_bus, (reg == SDVOB) ? "HDMIB" : "HDMIC");
351 
352 	if (!gma_encoder->i2c_bus) {
353 		dev_err(dev->dev, "No ddc adapter available!\n");
354 		goto failed_ddc;
355 	}
356 
357 	hdmi_priv->hdmi_i2c_adapter = &(gma_encoder->i2c_bus->adapter);
358 	hdmi_priv->dev = dev;
359 	drm_connector_register(connector);
360 	return;
361 
362 failed_ddc:
363 	drm_encoder_cleanup(encoder);
364 	drm_connector_cleanup(connector);
365 err_priv:
366 	kfree(gma_connector);
367 err_connector:
368 	kfree(gma_encoder);
369 }
370