1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3  * Copyright © 2006-2011 Intel Corporation
4  *
5  * Authors:
6  *	Eric Anholt <eric@anholt.net>
7  *	Patrik Jakobsson <patrik.r.jakobsson@gmail.com>
8  */
9 
10 #include <linux/delay.h>
11 #include <linux/highmem.h>
12 
13 #include <drm/drm_crtc.h>
14 #include <drm/drm_crtc_helper.h>
15 #include <drm/drm_fourcc.h>
16 #include <drm/drm_framebuffer.h>
17 #include <drm/drm_modeset_helper_vtables.h>
18 #include <drm/drm_vblank.h>
19 
20 #include "framebuffer.h"
21 #include "gem.h"
22 #include "gma_display.h"
23 #include "psb_irq.h"
24 #include "psb_intel_drv.h"
25 #include "psb_intel_reg.h"
26 
27 /*
28  * Returns whether any output on the specified pipe is of the specified type
29  */
30 bool gma_pipe_has_type(struct drm_crtc *crtc, int type)
31 {
32 	struct drm_device *dev = crtc->dev;
33 	struct drm_connector_list_iter conn_iter;
34 	struct drm_connector *connector;
35 
36 	drm_connector_list_iter_begin(dev, &conn_iter);
37 	drm_for_each_connector_iter(connector, &conn_iter) {
38 		if (connector->encoder && connector->encoder->crtc == crtc) {
39 			struct gma_encoder *gma_encoder =
40 						gma_attached_encoder(connector);
41 			if (gma_encoder->type == type) {
42 				drm_connector_list_iter_end(&conn_iter);
43 				return true;
44 			}
45 		}
46 	}
47 	drm_connector_list_iter_end(&conn_iter);
48 
49 	return false;
50 }
51 
52 void gma_wait_for_vblank(struct drm_device *dev)
53 {
54 	/* Wait for 20ms, i.e. one cycle at 50hz. */
55 	mdelay(20);
56 }
57 
58 int gma_pipe_set_base(struct drm_crtc *crtc, int x, int y,
59 		      struct drm_framebuffer *old_fb)
60 {
61 	struct drm_device *dev = crtc->dev;
62 	struct drm_psb_private *dev_priv = to_drm_psb_private(dev);
63 	struct gma_crtc *gma_crtc = to_gma_crtc(crtc);
64 	struct drm_framebuffer *fb = crtc->primary->fb;
65 	struct psb_gem_object *pobj;
66 	int pipe = gma_crtc->pipe;
67 	const struct psb_offset *map = &dev_priv->regmap[pipe];
68 	unsigned long start, offset;
69 	u32 dspcntr;
70 	int ret = 0;
71 
72 	if (!gma_power_begin(dev, true))
73 		return 0;
74 
75 	/* no fb bound */
76 	if (!fb) {
77 		dev_err(dev->dev, "No FB bound\n");
78 		goto gma_pipe_cleaner;
79 	}
80 
81 	pobj = to_psb_gem_object(fb->obj[0]);
82 
83 	/* We are displaying this buffer, make sure it is actually loaded
84 	   into the GTT */
85 	ret = psb_gem_pin(pobj);
86 	if (ret < 0)
87 		goto gma_pipe_set_base_exit;
88 	start = pobj->offset;
89 	offset = y * fb->pitches[0] + x * fb->format->cpp[0];
90 
91 	REG_WRITE(map->stride, fb->pitches[0]);
92 
93 	dspcntr = REG_READ(map->cntr);
94 	dspcntr &= ~DISPPLANE_PIXFORMAT_MASK;
95 
96 	switch (fb->format->cpp[0] * 8) {
97 	case 8:
98 		dspcntr |= DISPPLANE_8BPP;
99 		break;
100 	case 16:
101 		if (fb->format->depth == 15)
102 			dspcntr |= DISPPLANE_15_16BPP;
103 		else
104 			dspcntr |= DISPPLANE_16BPP;
105 		break;
106 	case 24:
107 	case 32:
108 		dspcntr |= DISPPLANE_32BPP_NO_ALPHA;
109 		break;
110 	default:
111 		dev_err(dev->dev, "Unknown color depth\n");
112 		ret = -EINVAL;
113 		goto gma_pipe_set_base_exit;
114 	}
115 	REG_WRITE(map->cntr, dspcntr);
116 
117 	dev_dbg(dev->dev,
118 		"Writing base %08lX %08lX %d %d\n", start, offset, x, y);
119 
120 	/* FIXME: Investigate whether this really is the base for psb and why
121 		  the linear offset is named base for the other chips. map->surf
122 		  should be the base and map->linoff the offset for all chips */
123 	if (IS_PSB(dev)) {
124 		REG_WRITE(map->base, offset + start);
125 		REG_READ(map->base);
126 	} else {
127 		REG_WRITE(map->base, offset);
128 		REG_READ(map->base);
129 		REG_WRITE(map->surf, start);
130 		REG_READ(map->surf);
131 	}
132 
133 gma_pipe_cleaner:
134 	/* If there was a previous display we can now unpin it */
135 	if (old_fb)
136 		psb_gem_unpin(to_psb_gem_object(old_fb->obj[0]));
137 
138 gma_pipe_set_base_exit:
139 	gma_power_end(dev);
140 	return ret;
141 }
142 
143 /* Loads the palette/gamma unit for the CRTC with the prepared values */
144 void gma_crtc_load_lut(struct drm_crtc *crtc)
145 {
146 	struct drm_device *dev = crtc->dev;
147 	struct drm_psb_private *dev_priv = to_drm_psb_private(dev);
148 	struct gma_crtc *gma_crtc = to_gma_crtc(crtc);
149 	const struct psb_offset *map = &dev_priv->regmap[gma_crtc->pipe];
150 	int palreg = map->palette;
151 	u16 *r, *g, *b;
152 	int i;
153 
154 	/* The clocks have to be on to load the palette. */
155 	if (!crtc->enabled)
156 		return;
157 
158 	r = crtc->gamma_store;
159 	g = r + crtc->gamma_size;
160 	b = g + crtc->gamma_size;
161 
162 	if (gma_power_begin(dev, false)) {
163 		for (i = 0; i < 256; i++) {
164 			REG_WRITE(palreg + 4 * i,
165 				  (((*r++ >> 8) + gma_crtc->lut_adj[i]) << 16) |
166 				  (((*g++ >> 8) + gma_crtc->lut_adj[i]) << 8) |
167 				  ((*b++ >> 8) + gma_crtc->lut_adj[i]));
168 		}
169 		gma_power_end(dev);
170 	} else {
171 		for (i = 0; i < 256; i++) {
172 			/* FIXME: Why pipe[0] and not pipe[..._crtc->pipe]? */
173 			dev_priv->regs.pipe[0].palette[i] =
174 				(((*r++ >> 8) + gma_crtc->lut_adj[i]) << 16) |
175 				(((*g++ >> 8) + gma_crtc->lut_adj[i]) << 8) |
176 				((*b++ >> 8) + gma_crtc->lut_adj[i]);
177 		}
178 
179 	}
180 }
181 
182 static int gma_crtc_gamma_set(struct drm_crtc *crtc, u16 *red, u16 *green,
183 			      u16 *blue, u32 size,
184 			      struct drm_modeset_acquire_ctx *ctx)
185 {
186 	gma_crtc_load_lut(crtc);
187 
188 	return 0;
189 }
190 
191 /*
192  * Sets the power management mode of the pipe and plane.
193  *
194  * This code should probably grow support for turning the cursor off and back
195  * on appropriately at the same time as we're turning the pipe off/on.
196  */
197 void gma_crtc_dpms(struct drm_crtc *crtc, int mode)
198 {
199 	struct drm_device *dev = crtc->dev;
200 	struct drm_psb_private *dev_priv = to_drm_psb_private(dev);
201 	struct gma_crtc *gma_crtc = to_gma_crtc(crtc);
202 	int pipe = gma_crtc->pipe;
203 	const struct psb_offset *map = &dev_priv->regmap[pipe];
204 	u32 temp;
205 
206 	/* XXX: When our outputs are all unaware of DPMS modes other than off
207 	 * and on, we should map those modes to DRM_MODE_DPMS_OFF in the CRTC.
208 	 */
209 
210 	if (IS_CDV(dev))
211 		dev_priv->ops->disable_sr(dev);
212 
213 	switch (mode) {
214 	case DRM_MODE_DPMS_ON:
215 	case DRM_MODE_DPMS_STANDBY:
216 	case DRM_MODE_DPMS_SUSPEND:
217 		if (gma_crtc->active)
218 			break;
219 
220 		gma_crtc->active = true;
221 
222 		/* Enable the DPLL */
223 		temp = REG_READ(map->dpll);
224 		if ((temp & DPLL_VCO_ENABLE) == 0) {
225 			REG_WRITE(map->dpll, temp);
226 			REG_READ(map->dpll);
227 			/* Wait for the clocks to stabilize. */
228 			udelay(150);
229 			REG_WRITE(map->dpll, temp | DPLL_VCO_ENABLE);
230 			REG_READ(map->dpll);
231 			/* Wait for the clocks to stabilize. */
232 			udelay(150);
233 			REG_WRITE(map->dpll, temp | DPLL_VCO_ENABLE);
234 			REG_READ(map->dpll);
235 			/* Wait for the clocks to stabilize. */
236 			udelay(150);
237 		}
238 
239 		/* Enable the plane */
240 		temp = REG_READ(map->cntr);
241 		if ((temp & DISPLAY_PLANE_ENABLE) == 0) {
242 			REG_WRITE(map->cntr,
243 				  temp | DISPLAY_PLANE_ENABLE);
244 			/* Flush the plane changes */
245 			REG_WRITE(map->base, REG_READ(map->base));
246 		}
247 
248 		udelay(150);
249 
250 		/* Enable the pipe */
251 		temp = REG_READ(map->conf);
252 		if ((temp & PIPEACONF_ENABLE) == 0)
253 			REG_WRITE(map->conf, temp | PIPEACONF_ENABLE);
254 
255 		temp = REG_READ(map->status);
256 		temp &= ~(0xFFFF);
257 		temp |= PIPE_FIFO_UNDERRUN;
258 		REG_WRITE(map->status, temp);
259 		REG_READ(map->status);
260 
261 		gma_crtc_load_lut(crtc);
262 
263 		/* Give the overlay scaler a chance to enable
264 		 * if it's on this pipe */
265 		/* psb_intel_crtc_dpms_video(crtc, true); TODO */
266 
267 		drm_crtc_vblank_on(crtc);
268 		break;
269 	case DRM_MODE_DPMS_OFF:
270 		if (!gma_crtc->active)
271 			break;
272 
273 		gma_crtc->active = false;
274 
275 		/* Give the overlay scaler a chance to disable
276 		 * if it's on this pipe */
277 		/* psb_intel_crtc_dpms_video(crtc, FALSE); TODO */
278 
279 		/* Disable the VGA plane that we never use */
280 		REG_WRITE(VGACNTRL, VGA_DISP_DISABLE);
281 
282 		/* Turn off vblank interrupts */
283 		drm_crtc_vblank_off(crtc);
284 
285 		/* Wait for vblank for the disable to take effect */
286 		gma_wait_for_vblank(dev);
287 
288 		/* Disable plane */
289 		temp = REG_READ(map->cntr);
290 		if ((temp & DISPLAY_PLANE_ENABLE) != 0) {
291 			REG_WRITE(map->cntr,
292 				  temp & ~DISPLAY_PLANE_ENABLE);
293 			/* Flush the plane changes */
294 			REG_WRITE(map->base, REG_READ(map->base));
295 			REG_READ(map->base);
296 		}
297 
298 		/* Disable pipe */
299 		temp = REG_READ(map->conf);
300 		if ((temp & PIPEACONF_ENABLE) != 0) {
301 			REG_WRITE(map->conf, temp & ~PIPEACONF_ENABLE);
302 			REG_READ(map->conf);
303 		}
304 
305 		/* Wait for vblank for the disable to take effect. */
306 		gma_wait_for_vblank(dev);
307 
308 		udelay(150);
309 
310 		/* Disable DPLL */
311 		temp = REG_READ(map->dpll);
312 		if ((temp & DPLL_VCO_ENABLE) != 0) {
313 			REG_WRITE(map->dpll, temp & ~DPLL_VCO_ENABLE);
314 			REG_READ(map->dpll);
315 		}
316 
317 		/* Wait for the clocks to turn off. */
318 		udelay(150);
319 		break;
320 	}
321 
322 	if (IS_CDV(dev))
323 		dev_priv->ops->update_wm(dev, crtc);
324 
325 	/* Set FIFO watermarks */
326 	REG_WRITE(DSPARB, 0x3F3E);
327 }
328 
329 static int gma_crtc_cursor_set(struct drm_crtc *crtc,
330 			       struct drm_file *file_priv, uint32_t handle,
331 			       uint32_t width, uint32_t height)
332 {
333 	struct drm_device *dev = crtc->dev;
334 	struct drm_psb_private *dev_priv = to_drm_psb_private(dev);
335 	struct gma_crtc *gma_crtc = to_gma_crtc(crtc);
336 	int pipe = gma_crtc->pipe;
337 	uint32_t control = (pipe == 0) ? CURACNTR : CURBCNTR;
338 	uint32_t base = (pipe == 0) ? CURABASE : CURBBASE;
339 	uint32_t temp;
340 	size_t addr = 0;
341 	struct psb_gem_object *pobj;
342 	struct psb_gem_object *cursor_pobj = gma_crtc->cursor_pobj;
343 	struct drm_gem_object *obj;
344 	void *tmp_dst;
345 	int ret = 0, i, cursor_pages;
346 
347 	/* If we didn't get a handle then turn the cursor off */
348 	if (!handle) {
349 		temp = CURSOR_MODE_DISABLE;
350 		if (gma_power_begin(dev, false)) {
351 			REG_WRITE(control, temp);
352 			REG_WRITE(base, 0);
353 			gma_power_end(dev);
354 		}
355 
356 		/* Unpin the old GEM object */
357 		if (gma_crtc->cursor_obj) {
358 			pobj = to_psb_gem_object(gma_crtc->cursor_obj);
359 			psb_gem_unpin(pobj);
360 			drm_gem_object_put(gma_crtc->cursor_obj);
361 			gma_crtc->cursor_obj = NULL;
362 		}
363 		return 0;
364 	}
365 
366 	/* Currently we only support 64x64 cursors */
367 	if (width != 64 || height != 64) {
368 		dev_dbg(dev->dev, "We currently only support 64x64 cursors\n");
369 		return -EINVAL;
370 	}
371 
372 	obj = drm_gem_object_lookup(file_priv, handle);
373 	if (!obj) {
374 		ret = -ENOENT;
375 		goto unlock;
376 	}
377 
378 	if (obj->size < width * height * 4) {
379 		dev_dbg(dev->dev, "Buffer is too small\n");
380 		ret = -ENOMEM;
381 		goto unref_cursor;
382 	}
383 
384 	pobj = to_psb_gem_object(obj);
385 
386 	/* Pin the memory into the GTT */
387 	ret = psb_gem_pin(pobj);
388 	if (ret) {
389 		dev_err(dev->dev, "Can not pin down handle 0x%x\n", handle);
390 		goto unref_cursor;
391 	}
392 
393 	if (dev_priv->ops->cursor_needs_phys) {
394 		if (!cursor_pobj) {
395 			dev_err(dev->dev, "No hardware cursor mem available");
396 			ret = -ENOMEM;
397 			goto unref_cursor;
398 		}
399 
400 		cursor_pages = obj->size / PAGE_SIZE;
401 		if (cursor_pages > 4)
402 			cursor_pages = 4; /* Prevent overflow */
403 
404 		/* Copy the cursor to cursor mem */
405 		tmp_dst = dev_priv->vram_addr + cursor_pobj->offset;
406 		for (i = 0; i < cursor_pages; i++) {
407 			memcpy_from_page(tmp_dst, pobj->pages[i], 0, PAGE_SIZE);
408 			tmp_dst += PAGE_SIZE;
409 		}
410 
411 		addr = gma_crtc->cursor_addr;
412 	} else {
413 		addr = pobj->offset;
414 		gma_crtc->cursor_addr = addr;
415 	}
416 
417 	temp = 0;
418 	/* set the pipe for the cursor */
419 	temp |= (pipe << 28);
420 	temp |= CURSOR_MODE_64_ARGB_AX | MCURSOR_GAMMA_ENABLE;
421 
422 	if (gma_power_begin(dev, false)) {
423 		REG_WRITE(control, temp);
424 		REG_WRITE(base, addr);
425 		gma_power_end(dev);
426 	}
427 
428 	/* unpin the old bo */
429 	if (gma_crtc->cursor_obj) {
430 		pobj = to_psb_gem_object(gma_crtc->cursor_obj);
431 		psb_gem_unpin(pobj);
432 		drm_gem_object_put(gma_crtc->cursor_obj);
433 	}
434 
435 	gma_crtc->cursor_obj = obj;
436 unlock:
437 	return ret;
438 
439 unref_cursor:
440 	drm_gem_object_put(obj);
441 	return ret;
442 }
443 
444 static int gma_crtc_cursor_move(struct drm_crtc *crtc, int x, int y)
445 {
446 	struct drm_device *dev = crtc->dev;
447 	struct gma_crtc *gma_crtc = to_gma_crtc(crtc);
448 	int pipe = gma_crtc->pipe;
449 	uint32_t temp = 0;
450 	uint32_t addr;
451 
452 	if (x < 0) {
453 		temp |= (CURSOR_POS_SIGN << CURSOR_X_SHIFT);
454 		x = -x;
455 	}
456 	if (y < 0) {
457 		temp |= (CURSOR_POS_SIGN << CURSOR_Y_SHIFT);
458 		y = -y;
459 	}
460 
461 	temp |= ((x & CURSOR_POS_MASK) << CURSOR_X_SHIFT);
462 	temp |= ((y & CURSOR_POS_MASK) << CURSOR_Y_SHIFT);
463 
464 	addr = gma_crtc->cursor_addr;
465 
466 	if (gma_power_begin(dev, false)) {
467 		REG_WRITE((pipe == 0) ? CURAPOS : CURBPOS, temp);
468 		REG_WRITE((pipe == 0) ? CURABASE : CURBBASE, addr);
469 		gma_power_end(dev);
470 	}
471 	return 0;
472 }
473 
474 void gma_crtc_prepare(struct drm_crtc *crtc)
475 {
476 	const struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private;
477 	crtc_funcs->dpms(crtc, DRM_MODE_DPMS_OFF);
478 }
479 
480 void gma_crtc_commit(struct drm_crtc *crtc)
481 {
482 	const struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private;
483 	crtc_funcs->dpms(crtc, DRM_MODE_DPMS_ON);
484 }
485 
486 void gma_crtc_disable(struct drm_crtc *crtc)
487 {
488 	struct psb_gem_object *pobj;
489 	const struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private;
490 
491 	crtc_funcs->dpms(crtc, DRM_MODE_DPMS_OFF);
492 
493 	if (crtc->primary->fb) {
494 		pobj = to_psb_gem_object(crtc->primary->fb->obj[0]);
495 		psb_gem_unpin(pobj);
496 	}
497 }
498 
499 void gma_crtc_destroy(struct drm_crtc *crtc)
500 {
501 	struct gma_crtc *gma_crtc = to_gma_crtc(crtc);
502 
503 	if (gma_crtc->cursor_pobj)
504 		drm_gem_object_put(&gma_crtc->cursor_pobj->base);
505 
506 	kfree(gma_crtc->crtc_state);
507 	drm_crtc_cleanup(crtc);
508 	kfree(gma_crtc);
509 }
510 
511 int gma_crtc_page_flip(struct drm_crtc *crtc,
512 		       struct drm_framebuffer *fb,
513 		       struct drm_pending_vblank_event *event,
514 		       uint32_t page_flip_flags,
515 		       struct drm_modeset_acquire_ctx *ctx)
516 {
517 	struct gma_crtc *gma_crtc = to_gma_crtc(crtc);
518 	struct drm_framebuffer *current_fb = crtc->primary->fb;
519 	struct drm_framebuffer *old_fb = crtc->primary->old_fb;
520 	const struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private;
521 	struct drm_device *dev = crtc->dev;
522 	unsigned long flags;
523 	int ret;
524 
525 	if (!crtc_funcs->mode_set_base)
526 		return -EINVAL;
527 
528 	/* Using mode_set_base requires the new fb to be set already. */
529 	crtc->primary->fb = fb;
530 
531 	if (event) {
532 		spin_lock_irqsave(&dev->event_lock, flags);
533 
534 		WARN_ON(drm_crtc_vblank_get(crtc) != 0);
535 
536 		gma_crtc->page_flip_event = event;
537 		spin_unlock_irqrestore(&dev->event_lock, flags);
538 
539 		/* Call this locked if we want an event at vblank interrupt. */
540 		ret = crtc_funcs->mode_set_base(crtc, crtc->x, crtc->y, old_fb);
541 		if (ret) {
542 			spin_lock_irqsave(&dev->event_lock, flags);
543 			if (gma_crtc->page_flip_event) {
544 				gma_crtc->page_flip_event = NULL;
545 				drm_crtc_vblank_put(crtc);
546 			}
547 			spin_unlock_irqrestore(&dev->event_lock, flags);
548 		}
549 	} else {
550 		ret = crtc_funcs->mode_set_base(crtc, crtc->x, crtc->y, old_fb);
551 	}
552 
553 	/* Restore previous fb in case of failure. */
554 	if (ret)
555 		crtc->primary->fb = current_fb;
556 
557 	return ret;
558 }
559 
560 const struct drm_crtc_funcs gma_crtc_funcs = {
561 	.cursor_set = gma_crtc_cursor_set,
562 	.cursor_move = gma_crtc_cursor_move,
563 	.gamma_set = gma_crtc_gamma_set,
564 	.set_config = drm_crtc_helper_set_config,
565 	.destroy = gma_crtc_destroy,
566 	.page_flip = gma_crtc_page_flip,
567 	.enable_vblank = gma_crtc_enable_vblank,
568 	.disable_vblank = gma_crtc_disable_vblank,
569 	.get_vblank_counter = gma_crtc_get_vblank_counter,
570 };
571 
572 /*
573  * Save HW states of given crtc
574  */
575 void gma_crtc_save(struct drm_crtc *crtc)
576 {
577 	struct drm_device *dev = crtc->dev;
578 	struct drm_psb_private *dev_priv = to_drm_psb_private(dev);
579 	struct gma_crtc *gma_crtc = to_gma_crtc(crtc);
580 	struct psb_intel_crtc_state *crtc_state = gma_crtc->crtc_state;
581 	const struct psb_offset *map = &dev_priv->regmap[gma_crtc->pipe];
582 	uint32_t palette_reg;
583 	int i;
584 
585 	if (!crtc_state) {
586 		dev_err(dev->dev, "No CRTC state found\n");
587 		return;
588 	}
589 
590 	crtc_state->saveDSPCNTR = REG_READ(map->cntr);
591 	crtc_state->savePIPECONF = REG_READ(map->conf);
592 	crtc_state->savePIPESRC = REG_READ(map->src);
593 	crtc_state->saveFP0 = REG_READ(map->fp0);
594 	crtc_state->saveFP1 = REG_READ(map->fp1);
595 	crtc_state->saveDPLL = REG_READ(map->dpll);
596 	crtc_state->saveHTOTAL = REG_READ(map->htotal);
597 	crtc_state->saveHBLANK = REG_READ(map->hblank);
598 	crtc_state->saveHSYNC = REG_READ(map->hsync);
599 	crtc_state->saveVTOTAL = REG_READ(map->vtotal);
600 	crtc_state->saveVBLANK = REG_READ(map->vblank);
601 	crtc_state->saveVSYNC = REG_READ(map->vsync);
602 	crtc_state->saveDSPSTRIDE = REG_READ(map->stride);
603 
604 	/* NOTE: DSPSIZE DSPPOS only for psb */
605 	crtc_state->saveDSPSIZE = REG_READ(map->size);
606 	crtc_state->saveDSPPOS = REG_READ(map->pos);
607 
608 	crtc_state->saveDSPBASE = REG_READ(map->base);
609 
610 	palette_reg = map->palette;
611 	for (i = 0; i < 256; ++i)
612 		crtc_state->savePalette[i] = REG_READ(palette_reg + (i << 2));
613 }
614 
615 /*
616  * Restore HW states of given crtc
617  */
618 void gma_crtc_restore(struct drm_crtc *crtc)
619 {
620 	struct drm_device *dev = crtc->dev;
621 	struct drm_psb_private *dev_priv = to_drm_psb_private(dev);
622 	struct gma_crtc *gma_crtc =  to_gma_crtc(crtc);
623 	struct psb_intel_crtc_state *crtc_state = gma_crtc->crtc_state;
624 	const struct psb_offset *map = &dev_priv->regmap[gma_crtc->pipe];
625 	uint32_t palette_reg;
626 	int i;
627 
628 	if (!crtc_state) {
629 		dev_err(dev->dev, "No crtc state\n");
630 		return;
631 	}
632 
633 	if (crtc_state->saveDPLL & DPLL_VCO_ENABLE) {
634 		REG_WRITE(map->dpll,
635 			crtc_state->saveDPLL & ~DPLL_VCO_ENABLE);
636 		REG_READ(map->dpll);
637 		udelay(150);
638 	}
639 
640 	REG_WRITE(map->fp0, crtc_state->saveFP0);
641 	REG_READ(map->fp0);
642 
643 	REG_WRITE(map->fp1, crtc_state->saveFP1);
644 	REG_READ(map->fp1);
645 
646 	REG_WRITE(map->dpll, crtc_state->saveDPLL);
647 	REG_READ(map->dpll);
648 	udelay(150);
649 
650 	REG_WRITE(map->htotal, crtc_state->saveHTOTAL);
651 	REG_WRITE(map->hblank, crtc_state->saveHBLANK);
652 	REG_WRITE(map->hsync, crtc_state->saveHSYNC);
653 	REG_WRITE(map->vtotal, crtc_state->saveVTOTAL);
654 	REG_WRITE(map->vblank, crtc_state->saveVBLANK);
655 	REG_WRITE(map->vsync, crtc_state->saveVSYNC);
656 	REG_WRITE(map->stride, crtc_state->saveDSPSTRIDE);
657 
658 	REG_WRITE(map->size, crtc_state->saveDSPSIZE);
659 	REG_WRITE(map->pos, crtc_state->saveDSPPOS);
660 
661 	REG_WRITE(map->src, crtc_state->savePIPESRC);
662 	REG_WRITE(map->base, crtc_state->saveDSPBASE);
663 	REG_WRITE(map->conf, crtc_state->savePIPECONF);
664 
665 	gma_wait_for_vblank(dev);
666 
667 	REG_WRITE(map->cntr, crtc_state->saveDSPCNTR);
668 	REG_WRITE(map->base, crtc_state->saveDSPBASE);
669 
670 	gma_wait_for_vblank(dev);
671 
672 	palette_reg = map->palette;
673 	for (i = 0; i < 256; ++i)
674 		REG_WRITE(palette_reg + (i << 2), crtc_state->savePalette[i]);
675 }
676 
677 void gma_encoder_prepare(struct drm_encoder *encoder)
678 {
679 	const struct drm_encoder_helper_funcs *encoder_funcs =
680 	    encoder->helper_private;
681 	/* lvds has its own version of prepare see psb_intel_lvds_prepare */
682 	encoder_funcs->dpms(encoder, DRM_MODE_DPMS_OFF);
683 }
684 
685 void gma_encoder_commit(struct drm_encoder *encoder)
686 {
687 	const struct drm_encoder_helper_funcs *encoder_funcs =
688 	    encoder->helper_private;
689 	/* lvds has its own version of commit see psb_intel_lvds_commit */
690 	encoder_funcs->dpms(encoder, DRM_MODE_DPMS_ON);
691 }
692 
693 void gma_encoder_destroy(struct drm_encoder *encoder)
694 {
695 	struct gma_encoder *intel_encoder = to_gma_encoder(encoder);
696 
697 	drm_encoder_cleanup(encoder);
698 	kfree(intel_encoder);
699 }
700 
701 /* Currently there is only a 1:1 mapping of encoders and connectors */
702 struct drm_encoder *gma_best_encoder(struct drm_connector *connector)
703 {
704 	struct gma_encoder *gma_encoder = gma_attached_encoder(connector);
705 
706 	return &gma_encoder->base;
707 }
708 
709 void gma_connector_attach_encoder(struct gma_connector *connector,
710 				  struct gma_encoder *encoder)
711 {
712 	connector->encoder = encoder;
713 	drm_connector_attach_encoder(&connector->base,
714 					  &encoder->base);
715 }
716 
717 #define GMA_PLL_INVALID(s) { /* DRM_ERROR(s); */ return false; }
718 
719 bool gma_pll_is_valid(struct drm_crtc *crtc,
720 		      const struct gma_limit_t *limit,
721 		      struct gma_clock_t *clock)
722 {
723 	if (clock->p1 < limit->p1.min || limit->p1.max < clock->p1)
724 		GMA_PLL_INVALID("p1 out of range");
725 	if (clock->p < limit->p.min || limit->p.max < clock->p)
726 		GMA_PLL_INVALID("p out of range");
727 	if (clock->m2 < limit->m2.min || limit->m2.max < clock->m2)
728 		GMA_PLL_INVALID("m2 out of range");
729 	if (clock->m1 < limit->m1.min || limit->m1.max < clock->m1)
730 		GMA_PLL_INVALID("m1 out of range");
731 	/* On CDV m1 is always 0 */
732 	if (clock->m1 <= clock->m2 && clock->m1 != 0)
733 		GMA_PLL_INVALID("m1 <= m2 && m1 != 0");
734 	if (clock->m < limit->m.min || limit->m.max < clock->m)
735 		GMA_PLL_INVALID("m out of range");
736 	if (clock->n < limit->n.min || limit->n.max < clock->n)
737 		GMA_PLL_INVALID("n out of range");
738 	if (clock->vco < limit->vco.min || limit->vco.max < clock->vco)
739 		GMA_PLL_INVALID("vco out of range");
740 	/* XXX: We may need to be checking "Dot clock"
741 	 * depending on the multiplier, connector, etc.,
742 	 * rather than just a single range.
743 	 */
744 	if (clock->dot < limit->dot.min || limit->dot.max < clock->dot)
745 		GMA_PLL_INVALID("dot out of range");
746 
747 	return true;
748 }
749 
750 bool gma_find_best_pll(const struct gma_limit_t *limit,
751 		       struct drm_crtc *crtc, int target, int refclk,
752 		       struct gma_clock_t *best_clock)
753 {
754 	struct drm_device *dev = crtc->dev;
755 	const struct gma_clock_funcs *clock_funcs =
756 						to_gma_crtc(crtc)->clock_funcs;
757 	struct gma_clock_t clock;
758 	int err = target;
759 
760 	if (gma_pipe_has_type(crtc, INTEL_OUTPUT_LVDS) &&
761 	    (REG_READ(LVDS) & LVDS_PORT_EN) != 0) {
762 		/*
763 		 * For LVDS, if the panel is on, just rely on its current
764 		 * settings for dual-channel.  We haven't figured out how to
765 		 * reliably set up different single/dual channel state, if we
766 		 * even can.
767 		 */
768 		if ((REG_READ(LVDS) & LVDS_CLKB_POWER_MASK) ==
769 		    LVDS_CLKB_POWER_UP)
770 			clock.p2 = limit->p2.p2_fast;
771 		else
772 			clock.p2 = limit->p2.p2_slow;
773 	} else {
774 		if (target < limit->p2.dot_limit)
775 			clock.p2 = limit->p2.p2_slow;
776 		else
777 			clock.p2 = limit->p2.p2_fast;
778 	}
779 
780 	memset(best_clock, 0, sizeof(*best_clock));
781 
782 	/* m1 is always 0 on CDV so the outmost loop will run just once */
783 	for (clock.m1 = limit->m1.min; clock.m1 <= limit->m1.max; clock.m1++) {
784 		for (clock.m2 = limit->m2.min;
785 		     (clock.m2 < clock.m1 || clock.m1 == 0) &&
786 		      clock.m2 <= limit->m2.max; clock.m2++) {
787 			for (clock.n = limit->n.min;
788 			     clock.n <= limit->n.max; clock.n++) {
789 				for (clock.p1 = limit->p1.min;
790 				     clock.p1 <= limit->p1.max;
791 				     clock.p1++) {
792 					int this_err;
793 
794 					clock_funcs->clock(refclk, &clock);
795 
796 					if (!clock_funcs->pll_is_valid(crtc,
797 								limit, &clock))
798 						continue;
799 
800 					this_err = abs(clock.dot - target);
801 					if (this_err < err) {
802 						*best_clock = clock;
803 						err = this_err;
804 					}
805 				}
806 			}
807 		}
808 	}
809 
810 	return err != target;
811 }
812