xref: /linux/drivers/gpu/drm/i915/display/skl_scaler.c (revision b4ebc06212a3b8906c837bf899b34a2ae36a5e0a)
1 // SPDX-License-Identifier: MIT
2 /*
3  * Copyright © 2020 Intel Corporation
4  */
5 
6 #include "i915_drv.h"
7 #include "i915_reg.h"
8 #include "intel_de.h"
9 #include "intel_display_trace.h"
10 #include "intel_display_types.h"
11 #include "intel_fb.h"
12 #include "skl_scaler.h"
13 #include "skl_universal_plane.h"
14 
15 /*
16  * The hardware phase 0.0 refers to the center of the pixel.
17  * We want to start from the top/left edge which is phase
18  * -0.5. That matches how the hardware calculates the scaling
19  * factors (from top-left of the first pixel to bottom-right
20  * of the last pixel, as opposed to the pixel centers).
21  *
22  * For 4:2:0 subsampled chroma planes we obviously have to
23  * adjust that so that the chroma sample position lands in
24  * the right spot.
25  *
26  * Note that for packed YCbCr 4:2:2 formats there is no way to
27  * control chroma siting. The hardware simply replicates the
28  * chroma samples for both of the luma samples, and thus we don't
29  * actually get the expected MPEG2 chroma siting convention :(
30  * The same behaviour is observed on pre-SKL platforms as well.
31  *
32  * Theory behind the formula (note that we ignore sub-pixel
33  * source coordinates):
34  * s = source sample position
35  * d = destination sample position
36  *
37  * Downscaling 4:1:
38  * -0.5
39  * | 0.0
40  * | |     1.5 (initial phase)
41  * | |     |
42  * v v     v
43  * | s | s | s | s |
44  * |       d       |
45  *
46  * Upscaling 1:4:
47  * -0.5
48  * | -0.375 (initial phase)
49  * | |     0.0
50  * | |     |
51  * v v     v
52  * |       s       |
53  * | d | d | d | d |
54  */
55 static u16 skl_scaler_calc_phase(int sub, int scale, bool chroma_cosited)
56 {
57 	int phase = -0x8000;
58 	u16 trip = 0;
59 
60 	if (chroma_cosited)
61 		phase += (sub - 1) * 0x8000 / sub;
62 
63 	phase += scale / (2 * sub);
64 
65 	/*
66 	 * Hardware initial phase limited to [-0.5:1.5].
67 	 * Since the max hardware scale factor is 3.0, we
68 	 * should never actually exceed 1.0 here.
69 	 */
70 	WARN_ON(phase < -0x8000 || phase > 0x18000);
71 
72 	if (phase < 0)
73 		phase = 0x10000 + phase;
74 	else
75 		trip = PS_PHASE_TRIP;
76 
77 	return ((phase >> 2) & PS_PHASE_MASK) | trip;
78 }
79 
80 static void skl_scaler_min_src_size(const struct drm_format_info *format,
81 				    u64 modifier, int *min_w, int *min_h)
82 {
83 	if (format && intel_format_info_is_yuv_semiplanar(format, modifier)) {
84 		*min_w = 16;
85 		*min_h = 16;
86 	} else {
87 		*min_w = 8;
88 		*min_h = 8;
89 	}
90 }
91 
92 static void skl_scaler_max_src_size(struct intel_crtc *crtc,
93 				    int *max_w, int *max_h)
94 {
95 	struct intel_display *display = to_intel_display(crtc);
96 
97 	if (DISPLAY_VER(display) >= 14) {
98 		*max_w = 4096;
99 		*max_h = 8192;
100 	} else if (DISPLAY_VER(display) >= 12) {
101 		*max_w = 5120;
102 		*max_h = 8192;
103 	} else if (DISPLAY_VER(display) == 11) {
104 		*max_w = 5120;
105 		*max_h = 4096;
106 	} else {
107 		*max_w = 4096;
108 		*max_h = 4096;
109 	}
110 }
111 
112 static void skl_scaler_min_dst_size(int *min_w, int *min_h)
113 {
114 	*min_w = 8;
115 	*min_h = 8;
116 }
117 
118 static void skl_scaler_max_dst_size(struct intel_crtc *crtc,
119 				    int *max_w, int *max_h)
120 {
121 	struct intel_display *display = to_intel_display(crtc);
122 
123 	if (DISPLAY_VER(display) >= 12) {
124 		*max_w = 8192;
125 		*max_h = 8192;
126 	} else if (DISPLAY_VER(display) == 11) {
127 		*max_w = 5120;
128 		*max_h = 4096;
129 	} else {
130 		*max_w = 4096;
131 		*max_h = 4096;
132 	}
133 }
134 
135 static int
136 skl_update_scaler(struct intel_crtc_state *crtc_state, bool force_detach,
137 		  unsigned int scaler_user, int *scaler_id,
138 		  int src_w, int src_h, int dst_w, int dst_h,
139 		  const struct drm_format_info *format,
140 		  u64 modifier, bool need_scaler)
141 {
142 	struct intel_display *display = to_intel_display(crtc_state);
143 	struct intel_crtc_scaler_state *scaler_state =
144 		&crtc_state->scaler_state;
145 	struct intel_crtc *crtc = to_intel_crtc(crtc_state->uapi.crtc);
146 	const struct drm_display_mode *adjusted_mode =
147 		&crtc_state->hw.adjusted_mode;
148 	int pipe_src_w = drm_rect_width(&crtc_state->pipe_src);
149 	int pipe_src_h = drm_rect_height(&crtc_state->pipe_src);
150 	int min_src_w, min_src_h, min_dst_w, min_dst_h;
151 	int max_src_w, max_src_h, max_dst_w, max_dst_h;
152 
153 	/*
154 	 * Src coordinates are already rotated by 270 degrees for
155 	 * the 90/270 degree plane rotation cases (to match the
156 	 * GTT mapping), hence no need to account for rotation here.
157 	 */
158 	if (src_w != dst_w || src_h != dst_h)
159 		need_scaler = true;
160 
161 	/*
162 	 * Scaling/fitting not supported in IF-ID mode in GEN9+
163 	 * TODO: Interlace fetch mode doesn't support YUV420 planar formats.
164 	 * Once NV12 is enabled, handle it here while allocating scaler
165 	 * for NV12.
166 	 */
167 	if (DISPLAY_VER(display) >= 9 && crtc_state->hw.enable &&
168 	    need_scaler && adjusted_mode->flags & DRM_MODE_FLAG_INTERLACE) {
169 		drm_dbg_kms(display->drm,
170 			    "[CRTC:%d:%s] scaling not supported with IF-ID mode\n",
171 			    crtc->base.base.id, crtc->base.name);
172 		return -EINVAL;
173 	}
174 
175 	/*
176 	 * if plane is being disabled or scaler is no more required or force detach
177 	 *  - free scaler binded to this plane/crtc
178 	 *  - in order to do this, update crtc->scaler_usage
179 	 *
180 	 * Here scaler state in crtc_state is set free so that
181 	 * scaler can be assigned to other user. Actual register
182 	 * update to free the scaler is done in plane/panel-fit programming.
183 	 * For this purpose crtc/plane_state->scaler_id isn't reset here.
184 	 */
185 	if (force_detach || !need_scaler) {
186 		if (*scaler_id >= 0) {
187 			scaler_state->scaler_users &= ~(1 << scaler_user);
188 			scaler_state->scalers[*scaler_id].in_use = false;
189 
190 			drm_dbg_kms(display->drm,
191 				    "[CRTC:%d:%s] scaler_user index %u.%u: "
192 				    "Staged freeing scaler id %d scaler_users = 0x%x\n",
193 				    crtc->base.base.id, crtc->base.name,
194 				    crtc->pipe, scaler_user, *scaler_id,
195 				    scaler_state->scaler_users);
196 			*scaler_id = -1;
197 		}
198 		return 0;
199 	}
200 
201 	skl_scaler_min_src_size(format, modifier, &min_src_w, &min_src_h);
202 	skl_scaler_max_src_size(crtc, &max_src_w, &max_src_h);
203 
204 	skl_scaler_min_dst_size(&min_dst_w, &min_dst_h);
205 	skl_scaler_max_dst_size(crtc, &max_dst_w, &max_dst_h);
206 
207 	/* range checks */
208 	if (src_w < min_src_w || src_h < min_src_h ||
209 	    dst_w < min_dst_w || dst_h < min_dst_h ||
210 	    src_w > max_src_w || src_h > max_src_h ||
211 	    dst_w > max_dst_w || dst_h > max_dst_h) {
212 		drm_dbg_kms(display->drm,
213 			    "[CRTC:%d:%s] scaler_user index %u.%u: src %ux%u dst %ux%u "
214 			    "size is out of scaler range\n",
215 			    crtc->base.base.id, crtc->base.name,
216 			    crtc->pipe, scaler_user, src_w, src_h,
217 			    dst_w, dst_h);
218 		return -EINVAL;
219 	}
220 
221 	/*
222 	 * The pipe scaler does not use all the bits of PIPESRC, at least
223 	 * on the earlier platforms. So even when we're scaling a plane
224 	 * the *pipe* source size must not be too large. For simplicity
225 	 * we assume the limits match the scaler destination size limits.
226 	 * Might not be 100% accurate on all platforms, but good enough for
227 	 * now.
228 	 */
229 	if (pipe_src_w > max_dst_w || pipe_src_h > max_dst_h) {
230 		drm_dbg_kms(display->drm,
231 			    "[CRTC:%d:%s] scaler_user index %u.%u: pipe src size %ux%u "
232 			    "is out of scaler range\n",
233 			    crtc->base.base.id, crtc->base.name,
234 			    crtc->pipe, scaler_user, pipe_src_w, pipe_src_h);
235 		return -EINVAL;
236 	}
237 
238 	/* mark this plane as a scaler user in crtc_state */
239 	scaler_state->scaler_users |= (1 << scaler_user);
240 	drm_dbg_kms(display->drm, "[CRTC:%d:%s] scaler_user index %u.%u: "
241 		    "staged scaling request for %ux%u->%ux%u scaler_users = 0x%x\n",
242 		    crtc->base.base.id, crtc->base.name,
243 		    crtc->pipe, scaler_user, src_w, src_h, dst_w, dst_h,
244 		    scaler_state->scaler_users);
245 
246 	return 0;
247 }
248 
249 int skl_update_scaler_crtc(struct intel_crtc_state *crtc_state)
250 {
251 	const struct drm_display_mode *pipe_mode = &crtc_state->hw.pipe_mode;
252 	int width, height;
253 
254 	if (crtc_state->pch_pfit.enabled) {
255 		width = drm_rect_width(&crtc_state->pch_pfit.dst);
256 		height = drm_rect_height(&crtc_state->pch_pfit.dst);
257 	} else {
258 		width = pipe_mode->crtc_hdisplay;
259 		height = pipe_mode->crtc_vdisplay;
260 	}
261 	return skl_update_scaler(crtc_state, !crtc_state->hw.active,
262 				 SKL_CRTC_INDEX,
263 				 &crtc_state->scaler_state.scaler_id,
264 				 drm_rect_width(&crtc_state->pipe_src),
265 				 drm_rect_height(&crtc_state->pipe_src),
266 				 width, height, NULL, 0,
267 				 crtc_state->pch_pfit.enabled);
268 }
269 
270 /**
271  * skl_update_scaler_plane - Stages update to scaler state for a given plane.
272  * @crtc_state: crtc's scaler state
273  * @plane_state: atomic plane state to update
274  *
275  * Return
276  *     0 - scaler_usage updated successfully
277  *    error - requested scaling cannot be supported or other error condition
278  */
279 int skl_update_scaler_plane(struct intel_crtc_state *crtc_state,
280 			    struct intel_plane_state *plane_state)
281 {
282 	struct intel_display *display = to_intel_display(plane_state);
283 	struct intel_plane *plane = to_intel_plane(plane_state->uapi.plane);
284 	struct drm_framebuffer *fb = plane_state->hw.fb;
285 	bool force_detach = !fb || !plane_state->uapi.visible;
286 	bool need_scaler = false;
287 
288 	/* Pre-gen11 and SDR planes always need a scaler for planar formats. */
289 	if (!icl_is_hdr_plane(display, plane->id) &&
290 	    fb && intel_format_info_is_yuv_semiplanar(fb->format, fb->modifier))
291 		need_scaler = true;
292 
293 	return skl_update_scaler(crtc_state, force_detach,
294 				 drm_plane_index(&plane->base),
295 				 &plane_state->scaler_id,
296 				 drm_rect_width(&plane_state->uapi.src) >> 16,
297 				 drm_rect_height(&plane_state->uapi.src) >> 16,
298 				 drm_rect_width(&plane_state->uapi.dst),
299 				 drm_rect_height(&plane_state->uapi.dst),
300 				 fb ? fb->format : NULL,
301 				 fb ? fb->modifier : 0,
302 				 need_scaler);
303 }
304 
305 static int intel_allocate_scaler(struct intel_crtc_scaler_state *scaler_state,
306 				 struct intel_crtc *crtc)
307 {
308 	int i;
309 
310 	for (i = 0; i < crtc->num_scalers; i++) {
311 		if (scaler_state->scalers[i].in_use)
312 			continue;
313 
314 		scaler_state->scalers[i].in_use = true;
315 
316 		return i;
317 	}
318 
319 	return -1;
320 }
321 
322 static void
323 calculate_max_scale(struct intel_crtc *crtc,
324 		    bool is_yuv_semiplanar,
325 		    int scaler_id,
326 		    int *max_hscale, int *max_vscale)
327 {
328 	struct intel_display *display = to_intel_display(crtc);
329 
330 	/*
331 	 * FIXME: When two scalers are needed, but only one of
332 	 * them needs to downscale, we should make sure that
333 	 * the one that needs downscaling support is assigned
334 	 * as the first scaler, so we don't reject downscaling
335 	 * unnecessarily.
336 	 */
337 
338 	if (DISPLAY_VER(display) >= 14) {
339 		/*
340 		 * On versions 14 and up, only the first
341 		 * scaler supports a vertical scaling factor
342 		 * of more than 1.0, while a horizontal
343 		 * scaling factor of 3.0 is supported.
344 		 */
345 		*max_hscale = 0x30000 - 1;
346 
347 		if (scaler_id == 0)
348 			*max_vscale = 0x30000 - 1;
349 		else
350 			*max_vscale = 0x10000;
351 	} else if (DISPLAY_VER(display) >= 10 || !is_yuv_semiplanar) {
352 		*max_hscale = 0x30000 - 1;
353 		*max_vscale = 0x30000 - 1;
354 	} else {
355 		*max_hscale = 0x20000 - 1;
356 		*max_vscale = 0x20000 - 1;
357 	}
358 }
359 
360 static int intel_atomic_setup_scaler(struct intel_crtc_state *crtc_state,
361 				     int num_scalers_need, struct intel_crtc *crtc,
362 				     const char *name, int idx,
363 				     struct intel_plane_state *plane_state,
364 				     int *scaler_id)
365 {
366 	struct intel_display *display = to_intel_display(crtc);
367 	struct intel_crtc_scaler_state *scaler_state = &crtc_state->scaler_state;
368 	u32 mode;
369 	int hscale = 0;
370 	int vscale = 0;
371 
372 	if (*scaler_id < 0)
373 		*scaler_id = intel_allocate_scaler(scaler_state, crtc);
374 
375 	if (drm_WARN(display->drm, *scaler_id < 0,
376 		     "Cannot find scaler for %s:%d\n", name, idx))
377 		return -EINVAL;
378 
379 	/* set scaler mode */
380 	if (plane_state && plane_state->hw.fb &&
381 	    plane_state->hw.fb->format->is_yuv &&
382 	    plane_state->hw.fb->format->num_planes > 1) {
383 		struct intel_plane *plane = to_intel_plane(plane_state->uapi.plane);
384 
385 		if (DISPLAY_VER(display) == 9) {
386 			mode = SKL_PS_SCALER_MODE_NV12;
387 		} else if (icl_is_hdr_plane(display, plane->id)) {
388 			/*
389 			 * On gen11+'s HDR planes we only use the scaler for
390 			 * scaling. They have a dedicated chroma upsampler, so
391 			 * we don't need the scaler to upsample the UV plane.
392 			 */
393 			mode = PS_SCALER_MODE_NORMAL;
394 		} else {
395 			struct intel_plane *linked =
396 				plane_state->planar_linked_plane;
397 
398 			mode = PS_SCALER_MODE_PLANAR;
399 
400 			if (linked)
401 				mode |= PS_BINDING_Y_PLANE(linked->id);
402 		}
403 	} else if (DISPLAY_VER(display) >= 10) {
404 		mode = PS_SCALER_MODE_NORMAL;
405 	} else if (num_scalers_need == 1 && crtc->num_scalers > 1) {
406 		/*
407 		 * when only 1 scaler is in use on a pipe with 2 scalers
408 		 * scaler 0 operates in high quality (HQ) mode.
409 		 * In this case use scaler 0 to take advantage of HQ mode
410 		 */
411 		scaler_state->scalers[*scaler_id].in_use = false;
412 		*scaler_id = 0;
413 		scaler_state->scalers[0].in_use = true;
414 		mode = SKL_PS_SCALER_MODE_HQ;
415 	} else {
416 		mode = SKL_PS_SCALER_MODE_DYN;
417 	}
418 
419 	if (plane_state && plane_state->hw.fb) {
420 		const struct drm_framebuffer *fb = plane_state->hw.fb;
421 		const struct drm_rect *src = &plane_state->uapi.src;
422 		const struct drm_rect *dst = &plane_state->uapi.dst;
423 		int max_hscale, max_vscale;
424 
425 		calculate_max_scale(crtc,
426 				    intel_format_info_is_yuv_semiplanar(fb->format, fb->modifier),
427 				    *scaler_id, &max_hscale, &max_vscale);
428 
429 		/*
430 		 * FIXME: We should change the if-else block above to
431 		 * support HQ vs dynamic scaler properly.
432 		 */
433 
434 		/* Check if required scaling is within limits */
435 		hscale = drm_rect_calc_hscale(src, dst, 1, max_hscale);
436 		vscale = drm_rect_calc_vscale(src, dst, 1, max_vscale);
437 
438 		if (hscale < 0 || vscale < 0) {
439 			drm_dbg_kms(display->drm,
440 				    "[CRTC:%d:%s] scaler %d doesn't support required plane scaling\n",
441 				    crtc->base.base.id, crtc->base.name, *scaler_id);
442 			drm_rect_debug_print("src: ", src, true);
443 			drm_rect_debug_print("dst: ", dst, false);
444 
445 			return -EINVAL;
446 		}
447 	}
448 
449 	if (crtc_state->pch_pfit.enabled) {
450 		struct drm_rect src;
451 		int max_hscale, max_vscale;
452 
453 		drm_rect_init(&src, 0, 0,
454 			      drm_rect_width(&crtc_state->pipe_src) << 16,
455 			      drm_rect_height(&crtc_state->pipe_src) << 16);
456 
457 		calculate_max_scale(crtc, 0, *scaler_id,
458 				    &max_hscale, &max_vscale);
459 
460 		/*
461 		 * When configured for Pipe YUV 420 encoding for port output,
462 		 * limit downscaling to less than 1.5 (source/destination) in
463 		 * the horizontal direction and 1.0 in the vertical direction.
464 		 */
465 		if (crtc_state->output_format == INTEL_OUTPUT_FORMAT_YCBCR420) {
466 			max_hscale = 0x18000 - 1;
467 			max_vscale = 0x10000;
468 		}
469 
470 		hscale = drm_rect_calc_hscale(&src, &crtc_state->pch_pfit.dst,
471 					      0, max_hscale);
472 		vscale = drm_rect_calc_vscale(&src, &crtc_state->pch_pfit.dst,
473 					      0, max_vscale);
474 
475 		if (hscale < 0 || vscale < 0) {
476 			drm_dbg_kms(display->drm,
477 				    "Scaler %d doesn't support required pipe scaling\n",
478 				    *scaler_id);
479 			drm_rect_debug_print("src: ", &src, true);
480 			drm_rect_debug_print("dst: ", &crtc_state->pch_pfit.dst, false);
481 
482 			return -EINVAL;
483 		}
484 	}
485 
486 	scaler_state->scalers[*scaler_id].hscale = hscale;
487 	scaler_state->scalers[*scaler_id].vscale = vscale;
488 
489 	drm_dbg_kms(display->drm, "[CRTC:%d:%s] attached scaler id %u.%u to %s:%d\n",
490 		    crtc->base.base.id, crtc->base.name,
491 		    crtc->pipe, *scaler_id, name, idx);
492 	scaler_state->scalers[*scaler_id].mode = mode;
493 
494 	return 0;
495 }
496 
497 static int setup_crtc_scaler(struct intel_atomic_state *state,
498 			     struct intel_crtc *crtc)
499 {
500 	struct intel_crtc_state *crtc_state =
501 		intel_atomic_get_new_crtc_state(state, crtc);
502 	struct intel_crtc_scaler_state *scaler_state =
503 		&crtc_state->scaler_state;
504 
505 	return intel_atomic_setup_scaler(crtc_state,
506 					 hweight32(scaler_state->scaler_users),
507 					 crtc, "CRTC", crtc->base.base.id,
508 					 NULL, &scaler_state->scaler_id);
509 }
510 
511 static int setup_plane_scaler(struct intel_atomic_state *state,
512 			      struct intel_crtc *crtc,
513 			      struct intel_plane *plane)
514 {
515 	struct intel_display *display = to_intel_display(state);
516 	struct intel_crtc_state *crtc_state =
517 		intel_atomic_get_new_crtc_state(state, crtc);
518 	struct intel_crtc_scaler_state *scaler_state =
519 		&crtc_state->scaler_state;
520 	struct intel_plane_state *plane_state;
521 
522 	/* plane on different crtc cannot be a scaler user of this crtc */
523 	if (drm_WARN_ON(display->drm, plane->pipe != crtc->pipe))
524 		return 0;
525 
526 	plane_state = intel_atomic_get_new_plane_state(state, plane);
527 
528 	/*
529 	 * GLK+ scalers don't have a HQ mode so it
530 	 * isn't necessary to change between HQ and dyn mode
531 	 * on those platforms.
532 	 */
533 	if (!plane_state && DISPLAY_VER(display) >= 10)
534 		return 0;
535 
536 	plane_state = intel_atomic_get_plane_state(state, plane);
537 	if (IS_ERR(plane_state))
538 		return PTR_ERR(plane_state);
539 
540 	return intel_atomic_setup_scaler(crtc_state,
541 					 hweight32(scaler_state->scaler_users),
542 					 crtc, "PLANE", plane->base.base.id,
543 					 plane_state, &plane_state->scaler_id);
544 }
545 
546 /**
547  * intel_atomic_setup_scalers() - setup scalers for crtc per staged requests
548  * @state: atomic state
549  * @crtc: crtc
550  *
551  * This function sets up scalers based on staged scaling requests for
552  * a @crtc and its planes. It is called from crtc level check path. If request
553  * is a supportable request, it attaches scalers to requested planes and crtc.
554  *
555  * This function takes into account the current scaler(s) in use by any planes
556  * not being part of this atomic state
557  *
558  *  Returns:
559  *         0 - scalers were setup successfully
560  *         error code - otherwise
561  */
562 int intel_atomic_setup_scalers(struct intel_atomic_state *state,
563 			       struct intel_crtc *crtc)
564 {
565 	struct intel_display *display = to_intel_display(crtc);
566 	struct intel_crtc_state *crtc_state =
567 		intel_atomic_get_new_crtc_state(state, crtc);
568 	struct intel_crtc_scaler_state *scaler_state =
569 		&crtc_state->scaler_state;
570 	int num_scalers_need;
571 	int i;
572 
573 	num_scalers_need = hweight32(scaler_state->scaler_users);
574 
575 	/*
576 	 * High level flow:
577 	 * - staged scaler requests are already in scaler_state->scaler_users
578 	 * - check whether staged scaling requests can be supported
579 	 * - add planes using scalers that aren't in current transaction
580 	 * - assign scalers to requested users
581 	 * - as part of plane commit, scalers will be committed
582 	 *   (i.e., either attached or detached) to respective planes in hw
583 	 * - as part of crtc_commit, scaler will be either attached or detached
584 	 *   to crtc in hw
585 	 */
586 
587 	/* fail if required scalers > available scalers */
588 	if (num_scalers_need > crtc->num_scalers) {
589 		drm_dbg_kms(display->drm,
590 			    "[CRTC:%d:%s] too many scaling requests %d > %d\n",
591 			    crtc->base.base.id, crtc->base.name,
592 			    num_scalers_need, crtc->num_scalers);
593 		return -EINVAL;
594 	}
595 
596 	/* walkthrough scaler_users bits and start assigning scalers */
597 	for (i = 0; i < sizeof(scaler_state->scaler_users) * 8; i++) {
598 		int ret;
599 
600 		/* skip if scaler not required */
601 		if (!(scaler_state->scaler_users & (1 << i)))
602 			continue;
603 
604 		if (i == SKL_CRTC_INDEX) {
605 			ret = setup_crtc_scaler(state, crtc);
606 			if (ret)
607 				return ret;
608 		} else {
609 			struct intel_plane *plane =
610 				to_intel_plane(drm_plane_from_index(display->drm, i));
611 
612 			ret = setup_plane_scaler(state, crtc, plane);
613 			if (ret)
614 				return ret;
615 		}
616 	}
617 
618 	return 0;
619 }
620 
621 static int glk_coef_tap(int i)
622 {
623 	return i % 7;
624 }
625 
626 static u16 glk_nearest_filter_coef(int t)
627 {
628 	return t == 3 ? 0x0800 : 0x3000;
629 }
630 
631 /*
632  *  Theory behind setting nearest-neighbor integer scaling:
633  *
634  *  17 phase of 7 taps requires 119 coefficients in 60 dwords per set.
635  *  The letter represents the filter tap (D is the center tap) and the number
636  *  represents the coefficient set for a phase (0-16).
637  *
638  *         +------------+--------------------------+--------------------------+
639  *         |Index value | Data value coefficient 1 | Data value coefficient 2 |
640  *         +------------+--------------------------+--------------------------+
641  *         |   00h      |          B0              |          A0              |
642  *         +------------+--------------------------+--------------------------+
643  *         |   01h      |          D0              |          C0              |
644  *         +------------+--------------------------+--------------------------+
645  *         |   02h      |          F0              |          E0              |
646  *         +------------+--------------------------+--------------------------+
647  *         |   03h      |          A1              |          G0              |
648  *         +------------+--------------------------+--------------------------+
649  *         |   04h      |          C1              |          B1              |
650  *         +------------+--------------------------+--------------------------+
651  *         |   ...      |          ...             |          ...             |
652  *         +------------+--------------------------+--------------------------+
653  *         |   38h      |          B16             |          A16             |
654  *         +------------+--------------------------+--------------------------+
655  *         |   39h      |          D16             |          C16             |
656  *         +------------+--------------------------+--------------------------+
657  *         |   3Ah      |          F16             |          C16             |
658  *         +------------+--------------------------+--------------------------+
659  *         |   3Bh      |        Reserved          |          G16             |
660  *         +------------+--------------------------+--------------------------+
661  *
662  *  To enable nearest-neighbor scaling:  program scaler coefficients with
663  *  the center tap (Dxx) values set to 1 and all other values set to 0 as per
664  *  SCALER_COEFFICIENT_FORMAT
665  *
666  */
667 
668 static void glk_program_nearest_filter_coefs(struct intel_display *display,
669 					     struct intel_dsb *dsb,
670 					     enum pipe pipe, int id, int set)
671 {
672 	int i;
673 
674 	intel_de_write_dsb(display, dsb,
675 			   GLK_PS_COEF_INDEX_SET(pipe, id, set),
676 			   PS_COEF_INDEX_AUTO_INC);
677 
678 	for (i = 0; i < 17 * 7; i += 2) {
679 		u32 tmp;
680 		int t;
681 
682 		t = glk_coef_tap(i);
683 		tmp = glk_nearest_filter_coef(t);
684 
685 		t = glk_coef_tap(i + 1);
686 		tmp |= glk_nearest_filter_coef(t) << 16;
687 
688 		intel_de_write_dsb(display, dsb,
689 				   GLK_PS_COEF_DATA_SET(pipe, id, set), tmp);
690 	}
691 
692 	intel_de_write_dsb(display, dsb,
693 			   GLK_PS_COEF_INDEX_SET(pipe, id, set), 0);
694 }
695 
696 static u32 skl_scaler_get_filter_select(enum drm_scaling_filter filter, int set)
697 {
698 	if (filter == DRM_SCALING_FILTER_NEAREST_NEIGHBOR) {
699 		return (PS_FILTER_PROGRAMMED |
700 			PS_Y_VERT_FILTER_SELECT(set) |
701 			PS_Y_HORZ_FILTER_SELECT(set) |
702 			PS_UV_VERT_FILTER_SELECT(set) |
703 			PS_UV_HORZ_FILTER_SELECT(set));
704 	}
705 
706 	return PS_FILTER_MEDIUM;
707 }
708 
709 static void skl_scaler_setup_filter(struct intel_display *display,
710 				    struct intel_dsb *dsb, enum pipe pipe,
711 				    int id, int set, enum drm_scaling_filter filter)
712 {
713 	switch (filter) {
714 	case DRM_SCALING_FILTER_DEFAULT:
715 		break;
716 	case DRM_SCALING_FILTER_NEAREST_NEIGHBOR:
717 		glk_program_nearest_filter_coefs(display, dsb, pipe, id, set);
718 		break;
719 	default:
720 		MISSING_CASE(filter);
721 	}
722 }
723 
724 void skl_pfit_enable(const struct intel_crtc_state *crtc_state)
725 {
726 	struct intel_display *display = to_intel_display(crtc_state);
727 	struct intel_crtc *crtc = to_intel_crtc(crtc_state->uapi.crtc);
728 	const struct intel_crtc_scaler_state *scaler_state =
729 		&crtc_state->scaler_state;
730 	const struct drm_rect *dst = &crtc_state->pch_pfit.dst;
731 	u16 uv_rgb_hphase, uv_rgb_vphase;
732 	enum pipe pipe = crtc->pipe;
733 	int width = drm_rect_width(dst);
734 	int height = drm_rect_height(dst);
735 	int x = dst->x1;
736 	int y = dst->y1;
737 	int hscale, vscale;
738 	struct drm_rect src;
739 	int id;
740 	u32 ps_ctrl;
741 
742 	if (!crtc_state->pch_pfit.enabled)
743 		return;
744 
745 	if (drm_WARN_ON(display->drm,
746 			crtc_state->scaler_state.scaler_id < 0))
747 		return;
748 
749 	drm_rect_init(&src, 0, 0,
750 		      drm_rect_width(&crtc_state->pipe_src) << 16,
751 		      drm_rect_height(&crtc_state->pipe_src) << 16);
752 
753 	hscale = drm_rect_calc_hscale(&src, dst, 0, INT_MAX);
754 	vscale = drm_rect_calc_vscale(&src, dst, 0, INT_MAX);
755 
756 	uv_rgb_hphase = skl_scaler_calc_phase(1, hscale, false);
757 	uv_rgb_vphase = skl_scaler_calc_phase(1, vscale, false);
758 
759 	id = scaler_state->scaler_id;
760 
761 	ps_ctrl = PS_SCALER_EN | PS_BINDING_PIPE | scaler_state->scalers[id].mode |
762 		skl_scaler_get_filter_select(crtc_state->hw.scaling_filter, 0);
763 
764 	trace_intel_pipe_scaler_update_arm(crtc, id, x, y, width, height);
765 
766 	skl_scaler_setup_filter(display, NULL, pipe, id, 0,
767 				crtc_state->hw.scaling_filter);
768 
769 	intel_de_write_fw(display, SKL_PS_CTRL(pipe, id), ps_ctrl);
770 
771 	intel_de_write_fw(display, SKL_PS_VPHASE(pipe, id),
772 			  PS_Y_PHASE(0) | PS_UV_RGB_PHASE(uv_rgb_vphase));
773 	intel_de_write_fw(display, SKL_PS_HPHASE(pipe, id),
774 			  PS_Y_PHASE(0) | PS_UV_RGB_PHASE(uv_rgb_hphase));
775 	intel_de_write_fw(display, SKL_PS_WIN_POS(pipe, id),
776 			  PS_WIN_XPOS(x) | PS_WIN_YPOS(y));
777 	intel_de_write_fw(display, SKL_PS_WIN_SZ(pipe, id),
778 			  PS_WIN_XSIZE(width) | PS_WIN_YSIZE(height));
779 }
780 
781 void
782 skl_program_plane_scaler(struct intel_dsb *dsb,
783 			 struct intel_plane *plane,
784 			 const struct intel_crtc_state *crtc_state,
785 			 const struct intel_plane_state *plane_state)
786 {
787 	struct intel_display *display = to_intel_display(plane);
788 	const struct drm_framebuffer *fb = plane_state->hw.fb;
789 	enum pipe pipe = plane->pipe;
790 	int scaler_id = plane_state->scaler_id;
791 	const struct intel_scaler *scaler =
792 		&crtc_state->scaler_state.scalers[scaler_id];
793 	int crtc_x = plane_state->uapi.dst.x1;
794 	int crtc_y = plane_state->uapi.dst.y1;
795 	u32 crtc_w = drm_rect_width(&plane_state->uapi.dst);
796 	u32 crtc_h = drm_rect_height(&plane_state->uapi.dst);
797 	u16 y_hphase, uv_rgb_hphase;
798 	u16 y_vphase, uv_rgb_vphase;
799 	int hscale, vscale;
800 	u32 ps_ctrl;
801 
802 	hscale = drm_rect_calc_hscale(&plane_state->uapi.src,
803 				      &plane_state->uapi.dst,
804 				      0, INT_MAX);
805 	vscale = drm_rect_calc_vscale(&plane_state->uapi.src,
806 				      &plane_state->uapi.dst,
807 				      0, INT_MAX);
808 
809 	/* TODO: handle sub-pixel coordinates */
810 	if (intel_format_info_is_yuv_semiplanar(fb->format, fb->modifier) &&
811 	    !icl_is_hdr_plane(display, plane->id)) {
812 		y_hphase = skl_scaler_calc_phase(1, hscale, false);
813 		y_vphase = skl_scaler_calc_phase(1, vscale, false);
814 
815 		/* MPEG2 chroma siting convention */
816 		uv_rgb_hphase = skl_scaler_calc_phase(2, hscale, true);
817 		uv_rgb_vphase = skl_scaler_calc_phase(2, vscale, false);
818 	} else {
819 		/* not used */
820 		y_hphase = 0;
821 		y_vphase = 0;
822 
823 		uv_rgb_hphase = skl_scaler_calc_phase(1, hscale, false);
824 		uv_rgb_vphase = skl_scaler_calc_phase(1, vscale, false);
825 	}
826 
827 	ps_ctrl = PS_SCALER_EN | PS_BINDING_PLANE(plane->id) | scaler->mode |
828 		skl_scaler_get_filter_select(plane_state->hw.scaling_filter, 0);
829 
830 	trace_intel_plane_scaler_update_arm(plane, scaler_id,
831 					    crtc_x, crtc_y, crtc_w, crtc_h);
832 
833 	skl_scaler_setup_filter(display, dsb, pipe, scaler_id, 0,
834 				plane_state->hw.scaling_filter);
835 
836 	intel_de_write_dsb(display, dsb, SKL_PS_CTRL(pipe, scaler_id),
837 			   ps_ctrl);
838 	intel_de_write_dsb(display, dsb, SKL_PS_VPHASE(pipe, scaler_id),
839 			   PS_Y_PHASE(y_vphase) | PS_UV_RGB_PHASE(uv_rgb_vphase));
840 	intel_de_write_dsb(display, dsb, SKL_PS_HPHASE(pipe, scaler_id),
841 			   PS_Y_PHASE(y_hphase) | PS_UV_RGB_PHASE(uv_rgb_hphase));
842 	intel_de_write_dsb(display, dsb, SKL_PS_WIN_POS(pipe, scaler_id),
843 			   PS_WIN_XPOS(crtc_x) | PS_WIN_YPOS(crtc_y));
844 	intel_de_write_dsb(display, dsb, SKL_PS_WIN_SZ(pipe, scaler_id),
845 			   PS_WIN_XSIZE(crtc_w) | PS_WIN_YSIZE(crtc_h));
846 }
847 
848 static void skl_detach_scaler(struct intel_dsb *dsb,
849 			      struct intel_crtc *crtc, int id)
850 {
851 	struct intel_display *display = to_intel_display(crtc);
852 
853 	trace_intel_scaler_disable_arm(crtc, id);
854 
855 	intel_de_write_dsb(display, dsb, SKL_PS_CTRL(crtc->pipe, id), 0);
856 	intel_de_write_dsb(display, dsb, SKL_PS_WIN_POS(crtc->pipe, id), 0);
857 	intel_de_write_dsb(display, dsb, SKL_PS_WIN_SZ(crtc->pipe, id), 0);
858 }
859 
860 /*
861  * This function detaches (aka. unbinds) unused scalers in hardware
862  */
863 void skl_detach_scalers(struct intel_dsb *dsb,
864 			const struct intel_crtc_state *crtc_state)
865 {
866 	struct intel_crtc *crtc = to_intel_crtc(crtc_state->uapi.crtc);
867 	const struct intel_crtc_scaler_state *scaler_state =
868 		&crtc_state->scaler_state;
869 	int i;
870 
871 	/* loop through and disable scalers that aren't in use */
872 	for (i = 0; i < crtc->num_scalers; i++) {
873 		if (!scaler_state->scalers[i].in_use)
874 			skl_detach_scaler(dsb, crtc, i);
875 	}
876 }
877 
878 void skl_scaler_disable(const struct intel_crtc_state *old_crtc_state)
879 {
880 	struct intel_crtc *crtc = to_intel_crtc(old_crtc_state->uapi.crtc);
881 	int i;
882 
883 	for (i = 0; i < crtc->num_scalers; i++)
884 		skl_detach_scaler(NULL, crtc, i);
885 }
886 
887 void skl_scaler_get_config(struct intel_crtc_state *crtc_state)
888 {
889 	struct intel_display *display = to_intel_display(crtc_state);
890 	struct intel_crtc *crtc = to_intel_crtc(crtc_state->uapi.crtc);
891 	struct intel_crtc_scaler_state *scaler_state = &crtc_state->scaler_state;
892 	int id = -1;
893 	int i;
894 
895 	/* find scaler attached to this pipe */
896 	for (i = 0; i < crtc->num_scalers; i++) {
897 		u32 ctl, pos, size;
898 
899 		ctl = intel_de_read(display, SKL_PS_CTRL(crtc->pipe, i));
900 		if ((ctl & (PS_SCALER_EN | PS_BINDING_MASK)) != (PS_SCALER_EN | PS_BINDING_PIPE))
901 			continue;
902 
903 		id = i;
904 		crtc_state->pch_pfit.enabled = true;
905 
906 		pos = intel_de_read(display, SKL_PS_WIN_POS(crtc->pipe, i));
907 		size = intel_de_read(display, SKL_PS_WIN_SZ(crtc->pipe, i));
908 
909 		drm_rect_init(&crtc_state->pch_pfit.dst,
910 			      REG_FIELD_GET(PS_WIN_XPOS_MASK, pos),
911 			      REG_FIELD_GET(PS_WIN_YPOS_MASK, pos),
912 			      REG_FIELD_GET(PS_WIN_XSIZE_MASK, size),
913 			      REG_FIELD_GET(PS_WIN_YSIZE_MASK, size));
914 
915 		scaler_state->scalers[i].in_use = true;
916 		break;
917 	}
918 
919 	scaler_state->scaler_id = id;
920 	if (id >= 0)
921 		scaler_state->scaler_users |= (1 << SKL_CRTC_INDEX);
922 	else
923 		scaler_state->scaler_users &= ~(1 << SKL_CRTC_INDEX);
924 }
925