1 /*
2  * Copyright © 2006-2009 Intel Corporation
3  *
4  * This program is free software; you can redistribute it and/or modify it
5  * under the terms and conditions of the GNU General Public License,
6  * version 2, as published by the Free Software Foundation.
7  *
8  * This program is distributed in the hope it will be useful, but WITHOUT
9  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
10  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
11  * more details.
12  *
13  * You should have received a copy of the GNU General Public License along with
14  * this program; if not, write to the Free Software Foundation, Inc.,
15  * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
16  *
17  * Authors:
18  *	Eric Anholt <eric@anholt.net>
19  *	Dave Airlie <airlied@linux.ie>
20  *	Jesse Barnes <jesse.barnes@intel.com>
21  */
22 
23 #include <linux/i2c.h>
24 #include <drm/drmP.h>
25 #include <asm/intel-mid.h>
26 
27 #include "intel_bios.h"
28 #include "psb_drv.h"
29 #include "psb_intel_drv.h"
30 #include "psb_intel_reg.h"
31 #include "power.h"
32 #include <linux/pm_runtime.h>
33 
34 /* The max/min PWM frequency in BPCR[31:17] - */
35 /* The smallest number is 1 (not 0) that can fit in the
36  * 15-bit field of the and then*/
37 /* shifts to the left by one bit to get the actual 16-bit
38  * value that the 15-bits correspond to.*/
39 #define MRST_BLC_MAX_PWM_REG_FREQ	    0xFFFF
40 #define BRIGHTNESS_MAX_LEVEL 100
41 
42 /**
43  * Sets the power state for the panel.
44  */
45 static void oaktrail_lvds_set_power(struct drm_device *dev,
46 				struct gma_encoder *gma_encoder,
47 				bool on)
48 {
49 	u32 pp_status;
50 	struct drm_psb_private *dev_priv = dev->dev_private;
51 
52 	if (!gma_power_begin(dev, true))
53 		return;
54 
55 	if (on) {
56 		REG_WRITE(PP_CONTROL, REG_READ(PP_CONTROL) |
57 			  POWER_TARGET_ON);
58 		do {
59 			pp_status = REG_READ(PP_STATUS);
60 		} while ((pp_status & (PP_ON | PP_READY)) == PP_READY);
61 		dev_priv->is_lvds_on = true;
62 		if (dev_priv->ops->lvds_bl_power)
63 			dev_priv->ops->lvds_bl_power(dev, true);
64 	} else {
65 		if (dev_priv->ops->lvds_bl_power)
66 			dev_priv->ops->lvds_bl_power(dev, false);
67 		REG_WRITE(PP_CONTROL, REG_READ(PP_CONTROL) &
68 			  ~POWER_TARGET_ON);
69 		do {
70 			pp_status = REG_READ(PP_STATUS);
71 		} while (pp_status & PP_ON);
72 		dev_priv->is_lvds_on = false;
73 		pm_request_idle(&dev->pdev->dev);
74 	}
75 	gma_power_end(dev);
76 }
77 
78 static void oaktrail_lvds_dpms(struct drm_encoder *encoder, int mode)
79 {
80 	struct drm_device *dev = encoder->dev;
81 	struct gma_encoder *gma_encoder = to_gma_encoder(encoder);
82 
83 	if (mode == DRM_MODE_DPMS_ON)
84 		oaktrail_lvds_set_power(dev, gma_encoder, true);
85 	else
86 		oaktrail_lvds_set_power(dev, gma_encoder, false);
87 
88 	/* XXX: We never power down the LVDS pairs. */
89 }
90 
91 static void oaktrail_lvds_mode_set(struct drm_encoder *encoder,
92 			       struct drm_display_mode *mode,
93 			       struct drm_display_mode *adjusted_mode)
94 {
95 	struct drm_device *dev = encoder->dev;
96 	struct drm_psb_private *dev_priv = dev->dev_private;
97 	struct psb_intel_mode_device *mode_dev = &dev_priv->mode_dev;
98 	struct drm_mode_config *mode_config = &dev->mode_config;
99 	struct drm_connector *connector = NULL;
100 	struct drm_crtc *crtc = encoder->crtc;
101 	u32 lvds_port;
102 	uint64_t v = DRM_MODE_SCALE_FULLSCREEN;
103 
104 	if (!gma_power_begin(dev, true))
105 		return;
106 
107 	/*
108 	 * The LVDS pin pair will already have been turned on in the
109 	 * psb_intel_crtc_mode_set since it has a large impact on the DPLL
110 	 * settings.
111 	 */
112 	lvds_port = (REG_READ(LVDS) &
113 		    (~LVDS_PIPEB_SELECT)) |
114 		    LVDS_PORT_EN |
115 		    LVDS_BORDER_EN;
116 
117 	/* If the firmware says dither on Moorestown, or the BIOS does
118 	   on Oaktrail then enable dithering */
119 	if (mode_dev->panel_wants_dither || dev_priv->lvds_dither)
120 		lvds_port |= MRST_PANEL_8TO6_DITHER_ENABLE;
121 
122 	REG_WRITE(LVDS, lvds_port);
123 
124 	/* Find the connector we're trying to set up */
125 	list_for_each_entry(connector, &mode_config->connector_list, head) {
126 		if (!connector->encoder || connector->encoder->crtc != crtc)
127 			continue;
128 	}
129 
130 	if (!connector) {
131 		DRM_ERROR("Couldn't find connector when setting mode");
132 		return;
133 	}
134 
135 	drm_object_property_get_value(
136 		&connector->base,
137 		dev->mode_config.scaling_mode_property,
138 		&v);
139 
140 	if (v == DRM_MODE_SCALE_NO_SCALE)
141 		REG_WRITE(PFIT_CONTROL, 0);
142 	else if (v == DRM_MODE_SCALE_ASPECT) {
143 		if ((mode->vdisplay != adjusted_mode->crtc_vdisplay) ||
144 		    (mode->hdisplay != adjusted_mode->crtc_hdisplay)) {
145 			if ((adjusted_mode->crtc_hdisplay * mode->vdisplay) ==
146 			    (mode->hdisplay * adjusted_mode->crtc_vdisplay))
147 				REG_WRITE(PFIT_CONTROL, PFIT_ENABLE);
148 			else if ((adjusted_mode->crtc_hdisplay *
149 				mode->vdisplay) > (mode->hdisplay *
150 				adjusted_mode->crtc_vdisplay))
151 				REG_WRITE(PFIT_CONTROL, PFIT_ENABLE |
152 					  PFIT_SCALING_MODE_PILLARBOX);
153 			else
154 				REG_WRITE(PFIT_CONTROL, PFIT_ENABLE |
155 					  PFIT_SCALING_MODE_LETTERBOX);
156 		} else
157 			REG_WRITE(PFIT_CONTROL, PFIT_ENABLE);
158 	} else /*(v == DRM_MODE_SCALE_FULLSCREEN)*/
159 		REG_WRITE(PFIT_CONTROL, PFIT_ENABLE);
160 
161 	gma_power_end(dev);
162 }
163 
164 static void oaktrail_lvds_prepare(struct drm_encoder *encoder)
165 {
166 	struct drm_device *dev = encoder->dev;
167 	struct drm_psb_private *dev_priv = dev->dev_private;
168 	struct gma_encoder *gma_encoder = to_gma_encoder(encoder);
169 	struct psb_intel_mode_device *mode_dev = &dev_priv->mode_dev;
170 
171 	if (!gma_power_begin(dev, true))
172 		return;
173 
174 	mode_dev->saveBLC_PWM_CTL = REG_READ(BLC_PWM_CTL);
175 	mode_dev->backlight_duty_cycle = (mode_dev->saveBLC_PWM_CTL &
176 					  BACKLIGHT_DUTY_CYCLE_MASK);
177 	oaktrail_lvds_set_power(dev, gma_encoder, false);
178 	gma_power_end(dev);
179 }
180 
181 static u32 oaktrail_lvds_get_max_backlight(struct drm_device *dev)
182 {
183 	struct drm_psb_private *dev_priv = dev->dev_private;
184 	u32 ret;
185 
186 	if (gma_power_begin(dev, false)) {
187 		ret = ((REG_READ(BLC_PWM_CTL) &
188 			  BACKLIGHT_MODULATION_FREQ_MASK) >>
189 			  BACKLIGHT_MODULATION_FREQ_SHIFT) * 2;
190 
191 		gma_power_end(dev);
192 	} else
193 		ret = ((dev_priv->regs.saveBLC_PWM_CTL &
194 			  BACKLIGHT_MODULATION_FREQ_MASK) >>
195 			  BACKLIGHT_MODULATION_FREQ_SHIFT) * 2;
196 
197 	return ret;
198 }
199 
200 static void oaktrail_lvds_commit(struct drm_encoder *encoder)
201 {
202 	struct drm_device *dev = encoder->dev;
203 	struct drm_psb_private *dev_priv = dev->dev_private;
204 	struct gma_encoder *gma_encoder = to_gma_encoder(encoder);
205 	struct psb_intel_mode_device *mode_dev = &dev_priv->mode_dev;
206 
207 	if (mode_dev->backlight_duty_cycle == 0)
208 		mode_dev->backlight_duty_cycle =
209 					oaktrail_lvds_get_max_backlight(dev);
210 	oaktrail_lvds_set_power(dev, gma_encoder, true);
211 }
212 
213 static const struct drm_encoder_helper_funcs oaktrail_lvds_helper_funcs = {
214 	.dpms = oaktrail_lvds_dpms,
215 	.mode_fixup = psb_intel_lvds_mode_fixup,
216 	.prepare = oaktrail_lvds_prepare,
217 	.mode_set = oaktrail_lvds_mode_set,
218 	.commit = oaktrail_lvds_commit,
219 };
220 
221 /* Returns the panel fixed mode from configuration. */
222 
223 static void oaktrail_lvds_get_configuration_mode(struct drm_device *dev,
224 					struct psb_intel_mode_device *mode_dev)
225 {
226 	struct drm_display_mode *mode = NULL;
227 	struct drm_psb_private *dev_priv = dev->dev_private;
228 	struct oaktrail_timing_info *ti = &dev_priv->gct_data.DTD;
229 
230 	mode_dev->panel_fixed_mode = NULL;
231 
232 	/* Use the firmware provided data on Moorestown */
233 	if (dev_priv->has_gct) {
234 		mode = kzalloc(sizeof(*mode), GFP_KERNEL);
235 		if (!mode)
236 			return;
237 
238 		mode->hdisplay = (ti->hactive_hi << 8) | ti->hactive_lo;
239 		mode->vdisplay = (ti->vactive_hi << 8) | ti->vactive_lo;
240 		mode->hsync_start = mode->hdisplay + \
241 				((ti->hsync_offset_hi << 8) | \
242 				ti->hsync_offset_lo);
243 		mode->hsync_end = mode->hsync_start + \
244 				((ti->hsync_pulse_width_hi << 8) | \
245 				ti->hsync_pulse_width_lo);
246 		mode->htotal = mode->hdisplay + ((ti->hblank_hi << 8) | \
247 							ti->hblank_lo);
248 		mode->vsync_start = \
249 			mode->vdisplay + ((ti->vsync_offset_hi << 4) | \
250 						ti->vsync_offset_lo);
251 		mode->vsync_end = \
252 			mode->vsync_start + ((ti->vsync_pulse_width_hi << 4) | \
253 						ti->vsync_pulse_width_lo);
254 		mode->vtotal = mode->vdisplay + \
255 				((ti->vblank_hi << 8) | ti->vblank_lo);
256 		mode->clock = ti->pixel_clock * 10;
257 #if 0
258 		pr_info("hdisplay is %d\n", mode->hdisplay);
259 		pr_info("vdisplay is %d\n", mode->vdisplay);
260 		pr_info("HSS is %d\n", mode->hsync_start);
261 		pr_info("HSE is %d\n", mode->hsync_end);
262 		pr_info("htotal is %d\n", mode->htotal);
263 		pr_info("VSS is %d\n", mode->vsync_start);
264 		pr_info("VSE is %d\n", mode->vsync_end);
265 		pr_info("vtotal is %d\n", mode->vtotal);
266 		pr_info("clock is %d\n", mode->clock);
267 #endif
268 		mode_dev->panel_fixed_mode = mode;
269 	}
270 
271 	/* Use the BIOS VBT mode if available */
272 	if (mode_dev->panel_fixed_mode == NULL && mode_dev->vbt_mode)
273 		mode_dev->panel_fixed_mode = drm_mode_duplicate(dev,
274 						mode_dev->vbt_mode);
275 
276 	/* Then try the LVDS VBT mode */
277 	if (mode_dev->panel_fixed_mode == NULL)
278 		if (dev_priv->lfp_lvds_vbt_mode)
279 			mode_dev->panel_fixed_mode =
280 				drm_mode_duplicate(dev,
281 					dev_priv->lfp_lvds_vbt_mode);
282 
283 	/* If we still got no mode then bail */
284 	if (mode_dev->panel_fixed_mode == NULL)
285 		return;
286 
287 	drm_mode_set_name(mode_dev->panel_fixed_mode);
288 	drm_mode_set_crtcinfo(mode_dev->panel_fixed_mode, 0);
289 }
290 
291 /**
292  * oaktrail_lvds_init - setup LVDS connectors on this device
293  * @dev: drm device
294  *
295  * Create the connector, register the LVDS DDC bus, and try to figure out what
296  * modes we can display on the LVDS panel (if present).
297  */
298 void oaktrail_lvds_init(struct drm_device *dev,
299 		    struct psb_intel_mode_device *mode_dev)
300 {
301 	struct gma_encoder *gma_encoder;
302 	struct gma_connector *gma_connector;
303 	struct drm_connector *connector;
304 	struct drm_encoder *encoder;
305 	struct drm_psb_private *dev_priv = dev->dev_private;
306 	struct edid *edid;
307 	struct i2c_adapter *i2c_adap;
308 	struct drm_display_mode *scan;	/* *modes, *bios_mode; */
309 
310 	gma_encoder = kzalloc(sizeof(struct gma_encoder), GFP_KERNEL);
311 	if (!gma_encoder)
312 		return;
313 
314 	gma_connector = kzalloc(sizeof(struct gma_connector), GFP_KERNEL);
315 	if (!gma_connector)
316 		goto failed_connector;
317 
318 	connector = &gma_connector->base;
319 	encoder = &gma_encoder->base;
320 	dev_priv->is_lvds_on = true;
321 	drm_connector_init(dev, connector,
322 			   &psb_intel_lvds_connector_funcs,
323 			   DRM_MODE_CONNECTOR_LVDS);
324 
325 	drm_encoder_init(dev, encoder, &psb_intel_lvds_enc_funcs,
326 			 DRM_MODE_ENCODER_LVDS, NULL);
327 
328 	gma_connector_attach_encoder(gma_connector, gma_encoder);
329 	gma_encoder->type = INTEL_OUTPUT_LVDS;
330 
331 	drm_encoder_helper_add(encoder, &oaktrail_lvds_helper_funcs);
332 	drm_connector_helper_add(connector,
333 				 &psb_intel_lvds_connector_helper_funcs);
334 	connector->display_info.subpixel_order = SubPixelHorizontalRGB;
335 	connector->interlace_allowed = false;
336 	connector->doublescan_allowed = false;
337 
338 	drm_object_attach_property(&connector->base,
339 					dev->mode_config.scaling_mode_property,
340 					DRM_MODE_SCALE_FULLSCREEN);
341 	drm_object_attach_property(&connector->base,
342 					dev_priv->backlight_property,
343 					BRIGHTNESS_MAX_LEVEL);
344 
345 	mode_dev->panel_wants_dither = false;
346 	if (dev_priv->has_gct)
347 		mode_dev->panel_wants_dither = (dev_priv->gct_data.
348 			Panel_Port_Control & MRST_PANEL_8TO6_DITHER_ENABLE);
349         if (dev_priv->lvds_dither)
350                 mode_dev->panel_wants_dither = 1;
351 
352 	/*
353 	 * LVDS discovery:
354 	 * 1) check for EDID on DDC
355 	 * 2) check for VBT data
356 	 * 3) check to see if LVDS is already on
357 	 *    if none of the above, no panel
358 	 * 4) make sure lid is open
359 	 *    if closed, act like it's not there for now
360 	 */
361 
362 	edid = NULL;
363 	mutex_lock(&dev->mode_config.mutex);
364 	i2c_adap = i2c_get_adapter(dev_priv->ops->i2c_bus);
365 	if (i2c_adap)
366 		edid = drm_get_edid(connector, i2c_adap);
367 	if (edid == NULL && dev_priv->lpc_gpio_base) {
368 		oaktrail_lvds_i2c_init(encoder);
369 		if (gma_encoder->ddc_bus != NULL) {
370 			i2c_adap = &gma_encoder->ddc_bus->adapter;
371 			edid = drm_get_edid(connector, i2c_adap);
372 		}
373 	}
374 	/*
375 	 * Attempt to get the fixed panel mode from DDC.  Assume that the
376 	 * preferred mode is the right one.
377 	 */
378 	if (edid) {
379 		drm_connector_update_edid_property(connector, edid);
380 		drm_add_edid_modes(connector, edid);
381 		kfree(edid);
382 
383 		list_for_each_entry(scan, &connector->probed_modes, head) {
384 			if (scan->type & DRM_MODE_TYPE_PREFERRED) {
385 				mode_dev->panel_fixed_mode =
386 				    drm_mode_duplicate(dev, scan);
387 				goto out;	/* FIXME: check for quirks */
388 			}
389 		}
390 	} else
391 		dev_err(dev->dev, "No ddc adapter available!\n");
392 	/*
393 	 * If we didn't get EDID, try geting panel timing
394 	 * from configuration data
395 	 */
396 	oaktrail_lvds_get_configuration_mode(dev, mode_dev);
397 
398 	if (mode_dev->panel_fixed_mode) {
399 		mode_dev->panel_fixed_mode->type |= DRM_MODE_TYPE_PREFERRED;
400 		goto out;	/* FIXME: check for quirks */
401 	}
402 
403 	/* If we still don't have a mode after all that, give up. */
404 	if (!mode_dev->panel_fixed_mode) {
405 		dev_err(dev->dev, "Found no modes on the lvds, ignoring the LVDS\n");
406 		goto failed_find;
407 	}
408 
409 out:
410 	mutex_unlock(&dev->mode_config.mutex);
411 
412 	drm_connector_register(connector);
413 	return;
414 
415 failed_find:
416 	mutex_unlock(&dev->mode_config.mutex);
417 
418 	dev_dbg(dev->dev, "No LVDS modes found, disabling.\n");
419 	if (gma_encoder->ddc_bus) {
420 		psb_intel_i2c_destroy(gma_encoder->ddc_bus);
421 		gma_encoder->ddc_bus = NULL;
422 	}
423 
424 /* failed_ddc: */
425 
426 	drm_encoder_cleanup(encoder);
427 	drm_connector_cleanup(connector);
428 	kfree(gma_connector);
429 failed_connector:
430 	kfree(gma_encoder);
431 }
432 
433