1 // SPDX-License-Identifier: GPL-2.0
2 /*
3  * Copyright (C) 2018 Linus Walleij <linus.walleij@linaro.org>
4  * Parts of this file were based on the MCDE driver by Marcus Lorentzon
5  * (C) ST-Ericsson SA 2013
6  */
7 #include <linux/clk.h>
8 #include <linux/delay.h>
9 #include <linux/dma-buf.h>
10 #include <linux/regulator/consumer.h>
11 #include <linux/media-bus-format.h>
12 
13 #include <drm/drm_device.h>
14 #include <drm/drm_fb_cma_helper.h>
15 #include <drm/drm_fourcc.h>
16 #include <drm/drm_gem_cma_helper.h>
17 #include <drm/drm_gem_framebuffer_helper.h>
18 #include <drm/drm_mipi_dsi.h>
19 #include <drm/drm_simple_kms_helper.h>
20 #include <drm/drm_bridge.h>
21 #include <drm/drm_vblank.h>
22 #include <video/mipi_display.h>
23 
24 #include "mcde_drm.h"
25 #include "mcde_display_regs.h"
26 
27 enum mcde_fifo {
28 	MCDE_FIFO_A,
29 	MCDE_FIFO_B,
30 	/* TODO: implement FIFO C0 and FIFO C1 */
31 };
32 
33 enum mcde_channel {
34 	MCDE_CHANNEL_0 = 0,
35 	MCDE_CHANNEL_1,
36 	MCDE_CHANNEL_2,
37 	MCDE_CHANNEL_3,
38 };
39 
40 enum mcde_extsrc {
41 	MCDE_EXTSRC_0 = 0,
42 	MCDE_EXTSRC_1,
43 	MCDE_EXTSRC_2,
44 	MCDE_EXTSRC_3,
45 	MCDE_EXTSRC_4,
46 	MCDE_EXTSRC_5,
47 	MCDE_EXTSRC_6,
48 	MCDE_EXTSRC_7,
49 	MCDE_EXTSRC_8,
50 	MCDE_EXTSRC_9,
51 };
52 
53 enum mcde_overlay {
54 	MCDE_OVERLAY_0 = 0,
55 	MCDE_OVERLAY_1,
56 	MCDE_OVERLAY_2,
57 	MCDE_OVERLAY_3,
58 	MCDE_OVERLAY_4,
59 	MCDE_OVERLAY_5,
60 };
61 
62 enum mcde_formatter {
63 	MCDE_DSI_FORMATTER_0 = 0,
64 	MCDE_DSI_FORMATTER_1,
65 	MCDE_DSI_FORMATTER_2,
66 	MCDE_DSI_FORMATTER_3,
67 	MCDE_DSI_FORMATTER_4,
68 	MCDE_DSI_FORMATTER_5,
69 	MCDE_DPI_FORMATTER_0,
70 	MCDE_DPI_FORMATTER_1,
71 };
72 
73 void mcde_display_irq(struct mcde *mcde)
74 {
75 	u32 mispp, misovl, mischnl;
76 	bool vblank = false;
77 
78 	/* Handle display IRQs */
79 	mispp = readl(mcde->regs + MCDE_MISPP);
80 	misovl = readl(mcde->regs + MCDE_MISOVL);
81 	mischnl = readl(mcde->regs + MCDE_MISCHNL);
82 
83 	/*
84 	 * Handle IRQs from the DSI link. All IRQs from the DSI links
85 	 * are just latched onto the MCDE IRQ line, so we need to traverse
86 	 * any active DSI masters and check if an IRQ is originating from
87 	 * them.
88 	 *
89 	 * TODO: Currently only one DSI link is supported.
90 	 */
91 	if (!mcde->dpi_output && mcde_dsi_irq(mcde->mdsi)) {
92 		u32 val;
93 
94 		/*
95 		 * In oneshot mode we do not send continuous updates
96 		 * to the display, instead we only push out updates when
97 		 * the update function is called, then we disable the
98 		 * flow on the channel once we get the TE IRQ.
99 		 */
100 		if (mcde->flow_mode == MCDE_COMMAND_ONESHOT_FLOW) {
101 			spin_lock(&mcde->flow_lock);
102 			if (--mcde->flow_active == 0) {
103 				dev_dbg(mcde->dev, "TE0 IRQ\n");
104 				/* Disable FIFO A flow */
105 				val = readl(mcde->regs + MCDE_CRA0);
106 				val &= ~MCDE_CRX0_FLOEN;
107 				writel(val, mcde->regs + MCDE_CRA0);
108 			}
109 			spin_unlock(&mcde->flow_lock);
110 		}
111 	}
112 
113 	/* Vblank from one of the channels */
114 	if (mispp & MCDE_PP_VCMPA) {
115 		dev_dbg(mcde->dev, "chnl A vblank IRQ\n");
116 		vblank = true;
117 	}
118 	if (mispp & MCDE_PP_VCMPB) {
119 		dev_dbg(mcde->dev, "chnl B vblank IRQ\n");
120 		vblank = true;
121 	}
122 	if (mispp & MCDE_PP_VCMPC0)
123 		dev_dbg(mcde->dev, "chnl C0 vblank IRQ\n");
124 	if (mispp & MCDE_PP_VCMPC1)
125 		dev_dbg(mcde->dev, "chnl C1 vblank IRQ\n");
126 	if (mispp & MCDE_PP_VSCC0)
127 		dev_dbg(mcde->dev, "chnl C0 TE IRQ\n");
128 	if (mispp & MCDE_PP_VSCC1)
129 		dev_dbg(mcde->dev, "chnl C1 TE IRQ\n");
130 	writel(mispp, mcde->regs + MCDE_RISPP);
131 
132 	if (vblank)
133 		drm_crtc_handle_vblank(&mcde->pipe.crtc);
134 
135 	if (misovl)
136 		dev_info(mcde->dev, "some stray overlay IRQ %08x\n", misovl);
137 	writel(misovl, mcde->regs + MCDE_RISOVL);
138 
139 	if (mischnl)
140 		dev_info(mcde->dev, "some stray channel error IRQ %08x\n",
141 			 mischnl);
142 	writel(mischnl, mcde->regs + MCDE_RISCHNL);
143 }
144 
145 void mcde_display_disable_irqs(struct mcde *mcde)
146 {
147 	/* Disable all IRQs */
148 	writel(0, mcde->regs + MCDE_IMSCPP);
149 	writel(0, mcde->regs + MCDE_IMSCOVL);
150 	writel(0, mcde->regs + MCDE_IMSCCHNL);
151 
152 	/* Clear any pending IRQs */
153 	writel(0xFFFFFFFF, mcde->regs + MCDE_RISPP);
154 	writel(0xFFFFFFFF, mcde->regs + MCDE_RISOVL);
155 	writel(0xFFFFFFFF, mcde->regs + MCDE_RISCHNL);
156 }
157 
158 static int mcde_display_check(struct drm_simple_display_pipe *pipe,
159 			      struct drm_plane_state *pstate,
160 			      struct drm_crtc_state *cstate)
161 {
162 	const struct drm_display_mode *mode = &cstate->mode;
163 	struct drm_framebuffer *old_fb = pipe->plane.state->fb;
164 	struct drm_framebuffer *fb = pstate->fb;
165 
166 	if (fb) {
167 		u32 offset = drm_fb_cma_get_gem_addr(fb, pstate, 0);
168 
169 		/* FB base address must be dword aligned. */
170 		if (offset & 3) {
171 			DRM_DEBUG_KMS("FB not 32-bit aligned\n");
172 			return -EINVAL;
173 		}
174 
175 		/*
176 		 * There's no pitch register, the mode's hdisplay
177 		 * controls this.
178 		 */
179 		if (fb->pitches[0] != mode->hdisplay * fb->format->cpp[0]) {
180 			DRM_DEBUG_KMS("can't handle pitches\n");
181 			return -EINVAL;
182 		}
183 
184 		/*
185 		 * We can't change the FB format in a flicker-free
186 		 * manner (and only update it during CRTC enable).
187 		 */
188 		if (old_fb && old_fb->format != fb->format)
189 			cstate->mode_changed = true;
190 	}
191 
192 	return 0;
193 }
194 
195 static int mcde_configure_extsrc(struct mcde *mcde, enum mcde_extsrc src,
196 				 u32 format)
197 {
198 	u32 val;
199 	u32 conf;
200 	u32 cr;
201 
202 	switch (src) {
203 	case MCDE_EXTSRC_0:
204 		conf = MCDE_EXTSRC0CONF;
205 		cr = MCDE_EXTSRC0CR;
206 		break;
207 	case MCDE_EXTSRC_1:
208 		conf = MCDE_EXTSRC1CONF;
209 		cr = MCDE_EXTSRC1CR;
210 		break;
211 	case MCDE_EXTSRC_2:
212 		conf = MCDE_EXTSRC2CONF;
213 		cr = MCDE_EXTSRC2CR;
214 		break;
215 	case MCDE_EXTSRC_3:
216 		conf = MCDE_EXTSRC3CONF;
217 		cr = MCDE_EXTSRC3CR;
218 		break;
219 	case MCDE_EXTSRC_4:
220 		conf = MCDE_EXTSRC4CONF;
221 		cr = MCDE_EXTSRC4CR;
222 		break;
223 	case MCDE_EXTSRC_5:
224 		conf = MCDE_EXTSRC5CONF;
225 		cr = MCDE_EXTSRC5CR;
226 		break;
227 	case MCDE_EXTSRC_6:
228 		conf = MCDE_EXTSRC6CONF;
229 		cr = MCDE_EXTSRC6CR;
230 		break;
231 	case MCDE_EXTSRC_7:
232 		conf = MCDE_EXTSRC7CONF;
233 		cr = MCDE_EXTSRC7CR;
234 		break;
235 	case MCDE_EXTSRC_8:
236 		conf = MCDE_EXTSRC8CONF;
237 		cr = MCDE_EXTSRC8CR;
238 		break;
239 	case MCDE_EXTSRC_9:
240 		conf = MCDE_EXTSRC9CONF;
241 		cr = MCDE_EXTSRC9CR;
242 		break;
243 	}
244 
245 	/*
246 	 * Configure external source 0 one buffer (buffer 0)
247 	 * primary overlay ID 0.
248 	 * From mcde_hw.c ovly_update_registers() in the vendor tree
249 	 */
250 	val = 0 << MCDE_EXTSRCXCONF_BUF_ID_SHIFT;
251 	val |= 1 << MCDE_EXTSRCXCONF_BUF_NB_SHIFT;
252 	val |= 0 << MCDE_EXTSRCXCONF_PRI_OVLID_SHIFT;
253 
254 	switch (format) {
255 	case DRM_FORMAT_ARGB8888:
256 		val |= MCDE_EXTSRCXCONF_BPP_ARGB8888 <<
257 			MCDE_EXTSRCXCONF_BPP_SHIFT;
258 		break;
259 	case DRM_FORMAT_ABGR8888:
260 		val |= MCDE_EXTSRCXCONF_BPP_ARGB8888 <<
261 			MCDE_EXTSRCXCONF_BPP_SHIFT;
262 		val |= MCDE_EXTSRCXCONF_BGR;
263 		break;
264 	case DRM_FORMAT_XRGB8888:
265 		val |= MCDE_EXTSRCXCONF_BPP_XRGB8888 <<
266 			MCDE_EXTSRCXCONF_BPP_SHIFT;
267 		break;
268 	case DRM_FORMAT_XBGR8888:
269 		val |= MCDE_EXTSRCXCONF_BPP_XRGB8888 <<
270 			MCDE_EXTSRCXCONF_BPP_SHIFT;
271 		val |= MCDE_EXTSRCXCONF_BGR;
272 		break;
273 	case DRM_FORMAT_RGB888:
274 		val |= MCDE_EXTSRCXCONF_BPP_RGB888 <<
275 			MCDE_EXTSRCXCONF_BPP_SHIFT;
276 		break;
277 	case DRM_FORMAT_BGR888:
278 		val |= MCDE_EXTSRCXCONF_BPP_RGB888 <<
279 			MCDE_EXTSRCXCONF_BPP_SHIFT;
280 		val |= MCDE_EXTSRCXCONF_BGR;
281 		break;
282 	case DRM_FORMAT_ARGB4444:
283 		val |= MCDE_EXTSRCXCONF_BPP_ARGB4444 <<
284 			MCDE_EXTSRCXCONF_BPP_SHIFT;
285 		break;
286 	case DRM_FORMAT_ABGR4444:
287 		val |= MCDE_EXTSRCXCONF_BPP_ARGB4444 <<
288 			MCDE_EXTSRCXCONF_BPP_SHIFT;
289 		val |= MCDE_EXTSRCXCONF_BGR;
290 		break;
291 	case DRM_FORMAT_XRGB4444:
292 		val |= MCDE_EXTSRCXCONF_BPP_RGB444 <<
293 			MCDE_EXTSRCXCONF_BPP_SHIFT;
294 		break;
295 	case DRM_FORMAT_XBGR4444:
296 		val |= MCDE_EXTSRCXCONF_BPP_RGB444 <<
297 			MCDE_EXTSRCXCONF_BPP_SHIFT;
298 		val |= MCDE_EXTSRCXCONF_BGR;
299 		break;
300 	case DRM_FORMAT_XRGB1555:
301 		val |= MCDE_EXTSRCXCONF_BPP_IRGB1555 <<
302 			MCDE_EXTSRCXCONF_BPP_SHIFT;
303 		break;
304 	case DRM_FORMAT_XBGR1555:
305 		val |= MCDE_EXTSRCXCONF_BPP_IRGB1555 <<
306 			MCDE_EXTSRCXCONF_BPP_SHIFT;
307 		val |= MCDE_EXTSRCXCONF_BGR;
308 		break;
309 	case DRM_FORMAT_RGB565:
310 		val |= MCDE_EXTSRCXCONF_BPP_RGB565 <<
311 			MCDE_EXTSRCXCONF_BPP_SHIFT;
312 		break;
313 	case DRM_FORMAT_BGR565:
314 		val |= MCDE_EXTSRCXCONF_BPP_RGB565 <<
315 			MCDE_EXTSRCXCONF_BPP_SHIFT;
316 		val |= MCDE_EXTSRCXCONF_BGR;
317 		break;
318 	case DRM_FORMAT_YUV422:
319 		val |= MCDE_EXTSRCXCONF_BPP_YCBCR422 <<
320 			MCDE_EXTSRCXCONF_BPP_SHIFT;
321 		break;
322 	default:
323 		dev_err(mcde->dev, "Unknown pixel format 0x%08x\n",
324 			format);
325 		return -EINVAL;
326 	}
327 	writel(val, mcde->regs + conf);
328 
329 	/* Software select, primary */
330 	val = MCDE_EXTSRCXCR_SEL_MOD_SOFTWARE_SEL;
331 	val |= MCDE_EXTSRCXCR_MULTIOVL_CTRL_PRIMARY;
332 	writel(val, mcde->regs + cr);
333 
334 	return 0;
335 }
336 
337 static void mcde_configure_overlay(struct mcde *mcde, enum mcde_overlay ovl,
338 				   enum mcde_extsrc src,
339 				   enum mcde_channel ch,
340 				   const struct drm_display_mode *mode,
341 				   u32 format, int cpp)
342 {
343 	u32 val;
344 	u32 conf1;
345 	u32 conf2;
346 	u32 crop;
347 	u32 ljinc;
348 	u32 cr;
349 	u32 comp;
350 	u32 pixel_fetcher_watermark;
351 
352 	switch (ovl) {
353 	case MCDE_OVERLAY_0:
354 		conf1 = MCDE_OVL0CONF;
355 		conf2 = MCDE_OVL0CONF2;
356 		crop = MCDE_OVL0CROP;
357 		ljinc = MCDE_OVL0LJINC;
358 		cr = MCDE_OVL0CR;
359 		comp = MCDE_OVL0COMP;
360 		break;
361 	case MCDE_OVERLAY_1:
362 		conf1 = MCDE_OVL1CONF;
363 		conf2 = MCDE_OVL1CONF2;
364 		crop = MCDE_OVL1CROP;
365 		ljinc = MCDE_OVL1LJINC;
366 		cr = MCDE_OVL1CR;
367 		comp = MCDE_OVL1COMP;
368 		break;
369 	case MCDE_OVERLAY_2:
370 		conf1 = MCDE_OVL2CONF;
371 		conf2 = MCDE_OVL2CONF2;
372 		crop = MCDE_OVL2CROP;
373 		ljinc = MCDE_OVL2LJINC;
374 		cr = MCDE_OVL2CR;
375 		comp = MCDE_OVL2COMP;
376 		break;
377 	case MCDE_OVERLAY_3:
378 		conf1 = MCDE_OVL3CONF;
379 		conf2 = MCDE_OVL3CONF2;
380 		crop = MCDE_OVL3CROP;
381 		ljinc = MCDE_OVL3LJINC;
382 		cr = MCDE_OVL3CR;
383 		comp = MCDE_OVL3COMP;
384 		break;
385 	case MCDE_OVERLAY_4:
386 		conf1 = MCDE_OVL4CONF;
387 		conf2 = MCDE_OVL4CONF2;
388 		crop = MCDE_OVL4CROP;
389 		ljinc = MCDE_OVL4LJINC;
390 		cr = MCDE_OVL4CR;
391 		comp = MCDE_OVL4COMP;
392 		break;
393 	case MCDE_OVERLAY_5:
394 		conf1 = MCDE_OVL5CONF;
395 		conf2 = MCDE_OVL5CONF2;
396 		crop = MCDE_OVL5CROP;
397 		ljinc = MCDE_OVL5LJINC;
398 		cr = MCDE_OVL5CR;
399 		comp = MCDE_OVL5COMP;
400 		break;
401 	}
402 
403 	val = mode->hdisplay << MCDE_OVLXCONF_PPL_SHIFT;
404 	val |= mode->vdisplay << MCDE_OVLXCONF_LPF_SHIFT;
405 	/* Use external source 0 that we just configured */
406 	val |= src << MCDE_OVLXCONF_EXTSRC_ID_SHIFT;
407 	writel(val, mcde->regs + conf1);
408 
409 	val = MCDE_OVLXCONF2_BP_PER_PIXEL_ALPHA;
410 	val |= 0xff << MCDE_OVLXCONF2_ALPHAVALUE_SHIFT;
411 	/* OPQ: overlay is opaque */
412 	switch (format) {
413 	case DRM_FORMAT_ARGB8888:
414 	case DRM_FORMAT_ABGR8888:
415 	case DRM_FORMAT_ARGB4444:
416 	case DRM_FORMAT_ABGR4444:
417 	case DRM_FORMAT_XRGB1555:
418 	case DRM_FORMAT_XBGR1555:
419 		/* No OPQ */
420 		break;
421 	case DRM_FORMAT_XRGB8888:
422 	case DRM_FORMAT_XBGR8888:
423 	case DRM_FORMAT_RGB888:
424 	case DRM_FORMAT_BGR888:
425 	case DRM_FORMAT_RGB565:
426 	case DRM_FORMAT_BGR565:
427 	case DRM_FORMAT_YUV422:
428 		val |= MCDE_OVLXCONF2_OPQ;
429 		break;
430 	default:
431 		dev_err(mcde->dev, "Unknown pixel format 0x%08x\n",
432 			format);
433 		break;
434 	}
435 
436 	/*
437 	 * Pixel fetch watermark level is max 0x1FFF pixels.
438 	 * Two basic rules should be followed:
439 	 * 1. The value should be at least 256 bits.
440 	 * 2. The sum of all active overlays pixelfetch watermark level
441 	 *    multiplied with bits per pixel, should be lower than the
442 	 *    size of input_fifo_size in bits.
443 	 * 3. The value should be a multiple of a line (256 bits).
444 	 */
445 	switch (cpp) {
446 	case 2:
447 		pixel_fetcher_watermark = 128;
448 		break;
449 	case 3:
450 		pixel_fetcher_watermark = 96;
451 		break;
452 	case 4:
453 		pixel_fetcher_watermark = 48;
454 		break;
455 	default:
456 		pixel_fetcher_watermark = 48;
457 		break;
458 	}
459 	dev_dbg(mcde->dev, "pixel fetcher watermark level %d pixels\n",
460 		pixel_fetcher_watermark);
461 	val |= pixel_fetcher_watermark << MCDE_OVLXCONF2_PIXELFETCHERWATERMARKLEVEL_SHIFT;
462 	writel(val, mcde->regs + conf2);
463 
464 	/* Number of bytes to fetch per line */
465 	writel(mcde->stride, mcde->regs + ljinc);
466 	/* No cropping */
467 	writel(0, mcde->regs + crop);
468 
469 	/* Set up overlay control register */
470 	val = MCDE_OVLXCR_OVLEN;
471 	val |= MCDE_OVLXCR_COLCCTRL_DISABLED;
472 	val |= MCDE_OVLXCR_BURSTSIZE_8W <<
473 		MCDE_OVLXCR_BURSTSIZE_SHIFT;
474 	val |= MCDE_OVLXCR_MAXOUTSTANDING_8_REQ <<
475 		MCDE_OVLXCR_MAXOUTSTANDING_SHIFT;
476 	/* Not using rotation but set it up anyways */
477 	val |= MCDE_OVLXCR_ROTBURSTSIZE_8W <<
478 		MCDE_OVLXCR_ROTBURSTSIZE_SHIFT;
479 	writel(val, mcde->regs + cr);
480 
481 	/*
482 	 * Set up the overlay compositor to route the overlay out to
483 	 * the desired channel
484 	 */
485 	val = ch << MCDE_OVLXCOMP_CH_ID_SHIFT;
486 	writel(val, mcde->regs + comp);
487 }
488 
489 static void mcde_configure_channel(struct mcde *mcde, enum mcde_channel ch,
490 				   enum mcde_fifo fifo,
491 				   const struct drm_display_mode *mode)
492 {
493 	u32 val;
494 	u32 conf;
495 	u32 sync;
496 	u32 stat;
497 	u32 bgcol;
498 	u32 mux;
499 
500 	switch (ch) {
501 	case MCDE_CHANNEL_0:
502 		conf = MCDE_CHNL0CONF;
503 		sync = MCDE_CHNL0SYNCHMOD;
504 		stat = MCDE_CHNL0STAT;
505 		bgcol = MCDE_CHNL0BCKGNDCOL;
506 		mux = MCDE_CHNL0MUXING;
507 		break;
508 	case MCDE_CHANNEL_1:
509 		conf = MCDE_CHNL1CONF;
510 		sync = MCDE_CHNL1SYNCHMOD;
511 		stat = MCDE_CHNL1STAT;
512 		bgcol = MCDE_CHNL1BCKGNDCOL;
513 		mux = MCDE_CHNL1MUXING;
514 		break;
515 	case MCDE_CHANNEL_2:
516 		conf = MCDE_CHNL2CONF;
517 		sync = MCDE_CHNL2SYNCHMOD;
518 		stat = MCDE_CHNL2STAT;
519 		bgcol = MCDE_CHNL2BCKGNDCOL;
520 		mux = MCDE_CHNL2MUXING;
521 		break;
522 	case MCDE_CHANNEL_3:
523 		conf = MCDE_CHNL3CONF;
524 		sync = MCDE_CHNL3SYNCHMOD;
525 		stat = MCDE_CHNL3STAT;
526 		bgcol = MCDE_CHNL3BCKGNDCOL;
527 		mux = MCDE_CHNL3MUXING;
528 		return;
529 	}
530 
531 	/* Set up channel 0 sync (based on chnl_update_registers()) */
532 	switch (mcde->flow_mode) {
533 	case MCDE_COMMAND_ONESHOT_FLOW:
534 		/* Oneshot is achieved with software sync */
535 		val = MCDE_CHNLXSYNCHMOD_SRC_SYNCH_SOFTWARE
536 			<< MCDE_CHNLXSYNCHMOD_SRC_SYNCH_SHIFT;
537 		break;
538 	case MCDE_COMMAND_TE_FLOW:
539 		val = MCDE_CHNLXSYNCHMOD_SRC_SYNCH_HARDWARE
540 			<< MCDE_CHNLXSYNCHMOD_SRC_SYNCH_SHIFT;
541 		val |= MCDE_CHNLXSYNCHMOD_OUT_SYNCH_SRC_TE0
542 			<< MCDE_CHNLXSYNCHMOD_OUT_SYNCH_SRC_SHIFT;
543 		break;
544 	case MCDE_COMMAND_BTA_TE_FLOW:
545 		val = MCDE_CHNLXSYNCHMOD_SRC_SYNCH_HARDWARE
546 			<< MCDE_CHNLXSYNCHMOD_SRC_SYNCH_SHIFT;
547 		/*
548 		 * TODO:
549 		 * The vendor driver uses the formatter as sync source
550 		 * for BTA TE mode. Test to use TE if you have a panel
551 		 * that uses this mode.
552 		 */
553 		val |= MCDE_CHNLXSYNCHMOD_OUT_SYNCH_SRC_FORMATTER
554 			<< MCDE_CHNLXSYNCHMOD_OUT_SYNCH_SRC_SHIFT;
555 		break;
556 	case MCDE_VIDEO_TE_FLOW:
557 		val = MCDE_CHNLXSYNCHMOD_SRC_SYNCH_HARDWARE
558 			<< MCDE_CHNLXSYNCHMOD_SRC_SYNCH_SHIFT;
559 		val |= MCDE_CHNLXSYNCHMOD_OUT_SYNCH_SRC_TE0
560 			<< MCDE_CHNLXSYNCHMOD_OUT_SYNCH_SRC_SHIFT;
561 		break;
562 	case MCDE_VIDEO_FORMATTER_FLOW:
563 	case MCDE_DPI_FORMATTER_FLOW:
564 		val = MCDE_CHNLXSYNCHMOD_SRC_SYNCH_HARDWARE
565 			<< MCDE_CHNLXSYNCHMOD_SRC_SYNCH_SHIFT;
566 		val |= MCDE_CHNLXSYNCHMOD_OUT_SYNCH_SRC_FORMATTER
567 			<< MCDE_CHNLXSYNCHMOD_OUT_SYNCH_SRC_SHIFT;
568 		break;
569 	default:
570 		dev_err(mcde->dev, "unknown flow mode %d\n",
571 			mcde->flow_mode);
572 		return;
573 	}
574 
575 	writel(val, mcde->regs + sync);
576 
577 	/* Set up pixels per line and lines per frame */
578 	val = (mode->hdisplay - 1) << MCDE_CHNLXCONF_PPL_SHIFT;
579 	val |= (mode->vdisplay - 1) << MCDE_CHNLXCONF_LPF_SHIFT;
580 	writel(val, mcde->regs + conf);
581 
582 	/*
583 	 * Normalize color conversion:
584 	 * black background, OLED conversion disable on channel
585 	 */
586 	val = MCDE_CHNLXSTAT_CHNLBLBCKGND_EN |
587 		MCDE_CHNLXSTAT_CHNLRD;
588 	writel(val, mcde->regs + stat);
589 	writel(0, mcde->regs + bgcol);
590 
591 	/* Set up muxing: connect the channel to the desired FIFO */
592 	switch (fifo) {
593 	case MCDE_FIFO_A:
594 		writel(MCDE_CHNLXMUXING_FIFO_ID_FIFO_A,
595 		       mcde->regs + mux);
596 		break;
597 	case MCDE_FIFO_B:
598 		writel(MCDE_CHNLXMUXING_FIFO_ID_FIFO_B,
599 		       mcde->regs + mux);
600 		break;
601 	}
602 
603 	/*
604 	 * If using DPI configure the sync event.
605 	 * TODO: this is for LCD only, it does not cover TV out.
606 	 */
607 	if (mcde->dpi_output) {
608 		u32 stripwidth;
609 
610 		stripwidth = 0xF000 / (mode->vdisplay * 4);
611 		dev_info(mcde->dev, "stripwidth: %d\n", stripwidth);
612 
613 		val = MCDE_SYNCHCONF_HWREQVEVENT_ACTIVE_VIDEO |
614 			(mode->hdisplay - 1 - stripwidth) << MCDE_SYNCHCONF_HWREQVCNT_SHIFT |
615 			MCDE_SYNCHCONF_SWINTVEVENT_ACTIVE_VIDEO |
616 			(mode->hdisplay - 1 - stripwidth) << MCDE_SYNCHCONF_SWINTVCNT_SHIFT;
617 
618 		switch (fifo) {
619 		case MCDE_FIFO_A:
620 			writel(val, mcde->regs + MCDE_SYNCHCONFA);
621 			break;
622 		case MCDE_FIFO_B:
623 			writel(val, mcde->regs + MCDE_SYNCHCONFB);
624 			break;
625 		}
626 	}
627 }
628 
629 static void mcde_configure_fifo(struct mcde *mcde, enum mcde_fifo fifo,
630 				enum mcde_formatter fmt,
631 				int fifo_wtrmrk)
632 {
633 	u32 val;
634 	u32 ctrl;
635 	u32 cr0, cr1;
636 
637 	switch (fifo) {
638 	case MCDE_FIFO_A:
639 		ctrl = MCDE_CTRLA;
640 		cr0 = MCDE_CRA0;
641 		cr1 = MCDE_CRA1;
642 		break;
643 	case MCDE_FIFO_B:
644 		ctrl = MCDE_CTRLB;
645 		cr0 = MCDE_CRB0;
646 		cr1 = MCDE_CRB1;
647 		break;
648 	}
649 
650 	val = fifo_wtrmrk << MCDE_CTRLX_FIFOWTRMRK_SHIFT;
651 
652 	/*
653 	 * Select the formatter to use for this FIFO
654 	 *
655 	 * The register definitions imply that different IDs should be used
656 	 * by the DSI formatters depending on if they are in VID or CMD
657 	 * mode, and the manual says they are dedicated but identical.
658 	 * The vendor code uses them as it seems fit.
659 	 */
660 	switch (fmt) {
661 	case MCDE_DSI_FORMATTER_0:
662 		val |= MCDE_CTRLX_FORMTYPE_DSI << MCDE_CTRLX_FORMTYPE_SHIFT;
663 		val |= MCDE_CTRLX_FORMID_DSI0VID << MCDE_CTRLX_FORMID_SHIFT;
664 		break;
665 	case MCDE_DSI_FORMATTER_1:
666 		val |= MCDE_CTRLX_FORMTYPE_DSI << MCDE_CTRLX_FORMTYPE_SHIFT;
667 		val |= MCDE_CTRLX_FORMID_DSI0CMD << MCDE_CTRLX_FORMID_SHIFT;
668 		break;
669 	case MCDE_DSI_FORMATTER_2:
670 		val |= MCDE_CTRLX_FORMTYPE_DSI << MCDE_CTRLX_FORMTYPE_SHIFT;
671 		val |= MCDE_CTRLX_FORMID_DSI1VID << MCDE_CTRLX_FORMID_SHIFT;
672 		break;
673 	case MCDE_DSI_FORMATTER_3:
674 		val |= MCDE_CTRLX_FORMTYPE_DSI << MCDE_CTRLX_FORMTYPE_SHIFT;
675 		val |= MCDE_CTRLX_FORMID_DSI1CMD << MCDE_CTRLX_FORMID_SHIFT;
676 		break;
677 	case MCDE_DSI_FORMATTER_4:
678 		val |= MCDE_CTRLX_FORMTYPE_DSI << MCDE_CTRLX_FORMTYPE_SHIFT;
679 		val |= MCDE_CTRLX_FORMID_DSI2VID << MCDE_CTRLX_FORMID_SHIFT;
680 		break;
681 	case MCDE_DSI_FORMATTER_5:
682 		val |= MCDE_CTRLX_FORMTYPE_DSI << MCDE_CTRLX_FORMTYPE_SHIFT;
683 		val |= MCDE_CTRLX_FORMID_DSI2CMD << MCDE_CTRLX_FORMID_SHIFT;
684 		break;
685 	case MCDE_DPI_FORMATTER_0:
686 		val |= MCDE_CTRLX_FORMTYPE_DPITV << MCDE_CTRLX_FORMTYPE_SHIFT;
687 		val |= MCDE_CTRLX_FORMID_DPIA << MCDE_CTRLX_FORMID_SHIFT;
688 		break;
689 	case MCDE_DPI_FORMATTER_1:
690 		val |= MCDE_CTRLX_FORMTYPE_DPITV << MCDE_CTRLX_FORMTYPE_SHIFT;
691 		val |= MCDE_CTRLX_FORMID_DPIB << MCDE_CTRLX_FORMID_SHIFT;
692 		break;
693 	}
694 	writel(val, mcde->regs + ctrl);
695 
696 	/* Blend source with Alpha 0xff on FIFO */
697 	val = MCDE_CRX0_BLENDEN |
698 		0xff << MCDE_CRX0_ALPHABLEND_SHIFT;
699 	writel(val, mcde->regs + cr0);
700 
701 	spin_lock(&mcde->fifo_crx1_lock);
702 	val = readl(mcde->regs + cr1);
703 	/*
704 	 * Set-up from mcde_fmtr_dsi.c, fmtr_dsi_enable_video()
705 	 * FIXME: a different clock needs to be selected for TV out.
706 	 */
707 	if (mcde->dpi_output) {
708 		struct drm_connector *connector = drm_panel_bridge_connector(mcde->bridge);
709 		u32 bus_format;
710 
711 		/* Assume RGB888 24 bit if we have no further info */
712 		if (!connector->display_info.num_bus_formats) {
713 			dev_info(mcde->dev, "panel does not specify bus format, assume RGB888\n");
714 			bus_format = MEDIA_BUS_FMT_RGB888_1X24;
715 		} else {
716 			bus_format = connector->display_info.bus_formats[0];
717 		}
718 
719 		/*
720 		 * Set up the CDWIN and OUTBPP for the LCD
721 		 *
722 		 * FIXME: fill this in if you know the correspondance between the MIPI
723 		 * DPI specification and the media bus formats.
724 		 */
725 		val &= ~MCDE_CRX1_CDWIN_MASK;
726 		val &= ~MCDE_CRX1_OUTBPP_MASK;
727 		switch (bus_format) {
728 		case MEDIA_BUS_FMT_RGB888_1X24:
729 			val |= MCDE_CRX1_CDWIN_24BPP << MCDE_CRX1_CDWIN_SHIFT;
730 			val |= MCDE_CRX1_OUTBPP_24BPP << MCDE_CRX1_OUTBPP_SHIFT;
731 			break;
732 		default:
733 			dev_err(mcde->dev, "unknown bus format, assume RGB888\n");
734 			val |= MCDE_CRX1_CDWIN_24BPP << MCDE_CRX1_CDWIN_SHIFT;
735 			val |= MCDE_CRX1_OUTBPP_24BPP << MCDE_CRX1_OUTBPP_SHIFT;
736 			break;
737 		}
738 	} else {
739 		/* Use the MCDE clock for DSI */
740 		val &= ~MCDE_CRX1_CLKSEL_MASK;
741 		val |= MCDE_CRX1_CLKSEL_MCDECLK << MCDE_CRX1_CLKSEL_SHIFT;
742 	}
743 	writel(val, mcde->regs + cr1);
744 	spin_unlock(&mcde->fifo_crx1_lock);
745 };
746 
747 static void mcde_configure_dsi_formatter(struct mcde *mcde,
748 					 enum mcde_formatter fmt,
749 					 u32 formatter_frame,
750 					 int pkt_size)
751 {
752 	u32 val;
753 	u32 conf0;
754 	u32 frame;
755 	u32 pkt;
756 	u32 sync;
757 	u32 cmdw;
758 	u32 delay0, delay1;
759 
760 	switch (fmt) {
761 	case MCDE_DSI_FORMATTER_0:
762 		conf0 = MCDE_DSIVID0CONF0;
763 		frame = MCDE_DSIVID0FRAME;
764 		pkt = MCDE_DSIVID0PKT;
765 		sync = MCDE_DSIVID0SYNC;
766 		cmdw = MCDE_DSIVID0CMDW;
767 		delay0 = MCDE_DSIVID0DELAY0;
768 		delay1 = MCDE_DSIVID0DELAY1;
769 		break;
770 	case MCDE_DSI_FORMATTER_1:
771 		conf0 = MCDE_DSIVID1CONF0;
772 		frame = MCDE_DSIVID1FRAME;
773 		pkt = MCDE_DSIVID1PKT;
774 		sync = MCDE_DSIVID1SYNC;
775 		cmdw = MCDE_DSIVID1CMDW;
776 		delay0 = MCDE_DSIVID1DELAY0;
777 		delay1 = MCDE_DSIVID1DELAY1;
778 		break;
779 	case MCDE_DSI_FORMATTER_2:
780 		conf0 = MCDE_DSIVID2CONF0;
781 		frame = MCDE_DSIVID2FRAME;
782 		pkt = MCDE_DSIVID2PKT;
783 		sync = MCDE_DSIVID2SYNC;
784 		cmdw = MCDE_DSIVID2CMDW;
785 		delay0 = MCDE_DSIVID2DELAY0;
786 		delay1 = MCDE_DSIVID2DELAY1;
787 		break;
788 	default:
789 		dev_err(mcde->dev, "tried to configure a non-DSI formatter as DSI\n");
790 		return;
791 	}
792 
793 	/*
794 	 * Enable formatter
795 	 * 8 bit commands and DCS commands (notgen = not generic)
796 	 */
797 	val = MCDE_DSICONF0_CMD8 | MCDE_DSICONF0_DCSVID_NOTGEN;
798 	if (mcde->mdsi->mode_flags & MIPI_DSI_MODE_VIDEO)
799 		val |= MCDE_DSICONF0_VID_MODE_VID;
800 	switch (mcde->mdsi->format) {
801 	case MIPI_DSI_FMT_RGB888:
802 		val |= MCDE_DSICONF0_PACKING_RGB888 <<
803 			MCDE_DSICONF0_PACKING_SHIFT;
804 		break;
805 	case MIPI_DSI_FMT_RGB666:
806 		val |= MCDE_DSICONF0_PACKING_RGB666 <<
807 			MCDE_DSICONF0_PACKING_SHIFT;
808 		break;
809 	case MIPI_DSI_FMT_RGB666_PACKED:
810 		dev_err(mcde->dev,
811 			"we cannot handle the packed RGB666 format\n");
812 		val |= MCDE_DSICONF0_PACKING_RGB666 <<
813 			MCDE_DSICONF0_PACKING_SHIFT;
814 		break;
815 	case MIPI_DSI_FMT_RGB565:
816 		val |= MCDE_DSICONF0_PACKING_RGB565 <<
817 			MCDE_DSICONF0_PACKING_SHIFT;
818 		break;
819 	default:
820 		dev_err(mcde->dev, "unknown DSI format\n");
821 		return;
822 	}
823 	writel(val, mcde->regs + conf0);
824 
825 	writel(formatter_frame, mcde->regs + frame);
826 	writel(pkt_size, mcde->regs + pkt);
827 	writel(0, mcde->regs + sync);
828 	/* Define the MIPI command: we want to write into display memory */
829 	val = MIPI_DCS_WRITE_MEMORY_CONTINUE <<
830 		MCDE_DSIVIDXCMDW_CMDW_CONTINUE_SHIFT;
831 	val |= MIPI_DCS_WRITE_MEMORY_START <<
832 		MCDE_DSIVIDXCMDW_CMDW_START_SHIFT;
833 	writel(val, mcde->regs + cmdw);
834 
835 	/*
836 	 * FIXME: the vendor driver has some hack around this value in
837 	 * CMD mode with autotrig.
838 	 */
839 	writel(0, mcde->regs + delay0);
840 	writel(0, mcde->regs + delay1);
841 }
842 
843 static void mcde_enable_fifo(struct mcde *mcde, enum mcde_fifo fifo)
844 {
845 	u32 val;
846 	u32 cr;
847 
848 	switch (fifo) {
849 	case MCDE_FIFO_A:
850 		cr = MCDE_CRA0;
851 		break;
852 	case MCDE_FIFO_B:
853 		cr = MCDE_CRB0;
854 		break;
855 	default:
856 		dev_err(mcde->dev, "cannot enable FIFO %c\n",
857 			'A' + fifo);
858 		return;
859 	}
860 
861 	spin_lock(&mcde->flow_lock);
862 	val = readl(mcde->regs + cr);
863 	val |= MCDE_CRX0_FLOEN;
864 	writel(val, mcde->regs + cr);
865 	mcde->flow_active++;
866 	spin_unlock(&mcde->flow_lock);
867 }
868 
869 static void mcde_disable_fifo(struct mcde *mcde, enum mcde_fifo fifo,
870 			      bool wait_for_drain)
871 {
872 	int timeout = 100;
873 	u32 val;
874 	u32 cr;
875 
876 	switch (fifo) {
877 	case MCDE_FIFO_A:
878 		cr = MCDE_CRA0;
879 		break;
880 	case MCDE_FIFO_B:
881 		cr = MCDE_CRB0;
882 		break;
883 	default:
884 		dev_err(mcde->dev, "cannot disable FIFO %c\n",
885 			'A' + fifo);
886 		return;
887 	}
888 
889 	spin_lock(&mcde->flow_lock);
890 	val = readl(mcde->regs + cr);
891 	val &= ~MCDE_CRX0_FLOEN;
892 	writel(val, mcde->regs + cr);
893 	mcde->flow_active = 0;
894 	spin_unlock(&mcde->flow_lock);
895 
896 	if (!wait_for_drain)
897 		return;
898 
899 	/* Check that we really drained and stopped the flow */
900 	while (readl(mcde->regs + cr) & MCDE_CRX0_FLOEN) {
901 		usleep_range(1000, 1500);
902 		if (!--timeout) {
903 			dev_err(mcde->dev,
904 				"FIFO timeout while clearing FIFO %c\n",
905 				'A' + fifo);
906 			return;
907 		}
908 	}
909 }
910 
911 /*
912  * This drains a pipe i.e. a FIFO connected to a certain channel
913  */
914 static void mcde_drain_pipe(struct mcde *mcde, enum mcde_fifo fifo,
915 			    enum mcde_channel ch)
916 {
917 	u32 val;
918 	u32 ctrl;
919 	u32 synsw;
920 
921 	switch (fifo) {
922 	case MCDE_FIFO_A:
923 		ctrl = MCDE_CTRLA;
924 		break;
925 	case MCDE_FIFO_B:
926 		ctrl = MCDE_CTRLB;
927 		break;
928 	}
929 
930 	switch (ch) {
931 	case MCDE_CHANNEL_0:
932 		synsw = MCDE_CHNL0SYNCHSW;
933 		break;
934 	case MCDE_CHANNEL_1:
935 		synsw = MCDE_CHNL1SYNCHSW;
936 		break;
937 	case MCDE_CHANNEL_2:
938 		synsw = MCDE_CHNL2SYNCHSW;
939 		break;
940 	case MCDE_CHANNEL_3:
941 		synsw = MCDE_CHNL3SYNCHSW;
942 		return;
943 	}
944 
945 	val = readl(mcde->regs + ctrl);
946 	if (!(val & MCDE_CTRLX_FIFOEMPTY)) {
947 		dev_err(mcde->dev, "Channel A FIFO not empty (handover)\n");
948 		/* Attempt to clear the FIFO */
949 		mcde_enable_fifo(mcde, fifo);
950 		/* Trigger a software sync out on respective channel (0-3) */
951 		writel(MCDE_CHNLXSYNCHSW_SW_TRIG, mcde->regs + synsw);
952 		/* Disable FIFO A flow again */
953 		mcde_disable_fifo(mcde, fifo, true);
954 	}
955 }
956 
957 static int mcde_dsi_get_pkt_div(int ppl, int fifo_size)
958 {
959 	/*
960 	 * DSI command mode line packets should be split into an even number of
961 	 * packets smaller than or equal to the fifo size.
962 	 */
963 	int div;
964 	const int max_div = DIV_ROUND_UP(MCDE_MAX_WIDTH, fifo_size);
965 
966 	for (div = 1; div < max_div; div++)
967 		if (ppl % div == 0 && ppl / div <= fifo_size)
968 			return div;
969 	return 1;
970 }
971 
972 static void mcde_setup_dpi(struct mcde *mcde, const struct drm_display_mode *mode,
973 			   int *fifo_wtrmrk_lvl)
974 {
975 	struct drm_connector *connector = drm_panel_bridge_connector(mcde->bridge);
976 	u32 hsw, hfp, hbp;
977 	u32 vsw, vfp, vbp;
978 	u32 val;
979 
980 	/* FIXME: we only support LCD, implement TV out */
981 	hsw = mode->hsync_end - mode->hsync_start;
982 	hfp = mode->hsync_start - mode->hdisplay;
983 	hbp = mode->htotal - mode->hsync_end;
984 	vsw = mode->vsync_end - mode->vsync_start;
985 	vfp = mode->vsync_start - mode->vdisplay;
986 	vbp = mode->vtotal - mode->vsync_end;
987 
988 	dev_info(mcde->dev, "output on DPI LCD from channel A\n");
989 	/* Display actual values */
990 	dev_info(mcde->dev, "HSW: %d, HFP: %d, HBP: %d, VSW: %d, VFP: %d, VBP: %d\n",
991 		 hsw, hfp, hbp, vsw, vfp, vbp);
992 
993 	/*
994 	 * The pixel fetcher is 128 64-bit words deep = 1024 bytes.
995 	 * One overlay of 32bpp (4 cpp) assumed, fetch 160 pixels.
996 	 * 160 * 4 = 640 bytes.
997 	 */
998 	*fifo_wtrmrk_lvl = 640;
999 
1000 	/* Set up the main control, watermark level at 7 */
1001 	val = 7 << MCDE_CONF0_IFIFOCTRLWTRMRKLVL_SHIFT;
1002 
1003 	/*
1004 	 * This sets up the internal silicon muxing of the DPI
1005 	 * lines. This is how the silicon connects out to the
1006 	 * external pins, then the pins need to be further
1007 	 * configured into "alternate functions" using pin control
1008 	 * to actually get the signals out.
1009 	 *
1010 	 * FIXME: this is hardcoded to the only setting found in
1011 	 * the wild. If we need to use different settings for
1012 	 * different DPI displays, make this parameterizable from
1013 	 * the device tree.
1014 	 */
1015 	/* 24 bits DPI: connect Ch A LSB to D[0:7] */
1016 	val |= 0 << MCDE_CONF0_OUTMUX0_SHIFT;
1017 	/* 24 bits DPI: connect Ch A MID to D[8:15] */
1018 	val |= 1 << MCDE_CONF0_OUTMUX1_SHIFT;
1019 	/* Don't care about this muxing */
1020 	val |= 0 << MCDE_CONF0_OUTMUX2_SHIFT;
1021 	/* Don't care about this muxing */
1022 	val |= 0 << MCDE_CONF0_OUTMUX3_SHIFT;
1023 	/* 24 bits DPI: connect Ch A MSB to D[32:39] */
1024 	val |= 2 << MCDE_CONF0_OUTMUX4_SHIFT;
1025 	/* Syncmux bits zero: DPI channel A */
1026 	writel(val, mcde->regs + MCDE_CONF0);
1027 
1028 	/* This hammers us into LCD mode */
1029 	writel(0, mcde->regs + MCDE_TVCRA);
1030 
1031 	/* Front porch and sync width */
1032 	val = (vsw << MCDE_TVBL1_BEL1_SHIFT);
1033 	val |= (vfp << MCDE_TVBL1_BSL1_SHIFT);
1034 	writel(val, mcde->regs + MCDE_TVBL1A);
1035 	/* The vendor driver sets the same value into TVBL2A */
1036 	writel(val, mcde->regs + MCDE_TVBL2A);
1037 
1038 	/* Vertical back porch */
1039 	val = (vbp << MCDE_TVDVO_DVO1_SHIFT);
1040 	/* The vendor drivers sets the same value into TVDVOA */
1041 	val |= (vbp << MCDE_TVDVO_DVO2_SHIFT);
1042 	writel(val, mcde->regs + MCDE_TVDVOA);
1043 
1044 	/* Horizontal back porch, as 0 = 1 cycle we need to subtract 1 */
1045 	writel((hbp - 1), mcde->regs + MCDE_TVTIM1A);
1046 
1047 	/* Horizongal sync width and horizonal front porch, 0 = 1 cycle */
1048 	val = ((hsw - 1) << MCDE_TVLBALW_LBW_SHIFT);
1049 	val |= ((hfp - 1) << MCDE_TVLBALW_ALW_SHIFT);
1050 	writel(val, mcde->regs + MCDE_TVLBALWA);
1051 
1052 	/* Blank some TV registers we don't use */
1053 	writel(0, mcde->regs + MCDE_TVISLA);
1054 	writel(0, mcde->regs + MCDE_TVBLUA);
1055 
1056 	/* Set up sync inversion etc */
1057 	val = 0;
1058 	if (mode->flags & DRM_MODE_FLAG_NHSYNC)
1059 		val |= MCDE_LCDTIM1B_IHS;
1060 	if (mode->flags & DRM_MODE_FLAG_NVSYNC)
1061 		val |= MCDE_LCDTIM1B_IVS;
1062 	if (connector->display_info.bus_flags & DRM_BUS_FLAG_DE_LOW)
1063 		val |= MCDE_LCDTIM1B_IOE;
1064 	if (connector->display_info.bus_flags & DRM_BUS_FLAG_PIXDATA_DRIVE_NEGEDGE)
1065 		val |= MCDE_LCDTIM1B_IPC;
1066 	writel(val, mcde->regs + MCDE_LCDTIM1A);
1067 }
1068 
1069 static void mcde_setup_dsi(struct mcde *mcde, const struct drm_display_mode *mode,
1070 			   int cpp, int *fifo_wtrmrk_lvl, int *dsi_formatter_frame,
1071 			   int *dsi_pkt_size)
1072 {
1073 	u32 formatter_ppl = mode->hdisplay; /* pixels per line */
1074 	u32 formatter_lpf = mode->vdisplay; /* lines per frame */
1075 	int formatter_frame;
1076 	int formatter_cpp;
1077 	int fifo_wtrmrk;
1078 	u32 pkt_div;
1079 	int pkt_size;
1080 	u32 val;
1081 
1082 	dev_info(mcde->dev, "output in %s mode, format %dbpp\n",
1083 		 (mcde->mdsi->mode_flags & MIPI_DSI_MODE_VIDEO) ?
1084 		 "VIDEO" : "CMD",
1085 		 mipi_dsi_pixel_format_to_bpp(mcde->mdsi->format));
1086 	formatter_cpp =
1087 		mipi_dsi_pixel_format_to_bpp(mcde->mdsi->format) / 8;
1088 	dev_info(mcde->dev, "Overlay CPP: %d bytes, DSI formatter CPP %d bytes\n",
1089 		 cpp, formatter_cpp);
1090 
1091 	/* Set up the main control, watermark level at 7 */
1092 	val = 7 << MCDE_CONF0_IFIFOCTRLWTRMRKLVL_SHIFT;
1093 
1094 	/*
1095 	 * This is the internal silicon muxing of the DPI
1096 	 * (parallell display) lines. Since we are not using
1097 	 * this at all (we are using DSI) these are just
1098 	 * dummy values from the vendor tree.
1099 	 */
1100 	val |= 3 << MCDE_CONF0_OUTMUX0_SHIFT;
1101 	val |= 3 << MCDE_CONF0_OUTMUX1_SHIFT;
1102 	val |= 0 << MCDE_CONF0_OUTMUX2_SHIFT;
1103 	val |= 4 << MCDE_CONF0_OUTMUX3_SHIFT;
1104 	val |= 5 << MCDE_CONF0_OUTMUX4_SHIFT;
1105 	writel(val, mcde->regs + MCDE_CONF0);
1106 
1107 	/* Calculations from mcde_fmtr_dsi.c, fmtr_dsi_enable_video() */
1108 
1109 	/*
1110 	 * Set up FIFO A watermark level:
1111 	 * 128 for LCD 32bpp video mode
1112 	 * 48  for LCD 32bpp command mode
1113 	 * 128 for LCD 16bpp video mode
1114 	 * 64  for LCD 16bpp command mode
1115 	 * 128 for HDMI 32bpp
1116 	 * 192 for HDMI 16bpp
1117 	 */
1118 	fifo_wtrmrk = mode->hdisplay;
1119 	if (mcde->mdsi->mode_flags & MIPI_DSI_MODE_VIDEO) {
1120 		fifo_wtrmrk = min(fifo_wtrmrk, 128);
1121 		pkt_div = 1;
1122 	} else {
1123 		fifo_wtrmrk = min(fifo_wtrmrk, 48);
1124 		/* The FIFO is 640 entries deep on this v3 hardware */
1125 		pkt_div = mcde_dsi_get_pkt_div(mode->hdisplay, 640);
1126 	}
1127 	dev_dbg(mcde->dev, "FIFO watermark after flooring: %d bytes\n",
1128 		fifo_wtrmrk);
1129 	dev_dbg(mcde->dev, "Packet divisor: %d bytes\n", pkt_div);
1130 
1131 	/* NOTE: pkt_div is 1 for video mode */
1132 	pkt_size = (formatter_ppl * formatter_cpp) / pkt_div;
1133 	/* Commands CMD8 need one extra byte */
1134 	if (!(mcde->mdsi->mode_flags & MIPI_DSI_MODE_VIDEO))
1135 		pkt_size++;
1136 
1137 	dev_dbg(mcde->dev, "DSI packet size: %d * %d bytes per line\n",
1138 		pkt_size, pkt_div);
1139 	dev_dbg(mcde->dev, "Overlay frame size: %u bytes\n",
1140 		mode->hdisplay * mode->vdisplay * cpp);
1141 	/* NOTE: pkt_div is 1 for video mode */
1142 	formatter_frame = pkt_size * pkt_div * formatter_lpf;
1143 	dev_dbg(mcde->dev, "Formatter frame size: %u bytes\n", formatter_frame);
1144 
1145 	*fifo_wtrmrk_lvl = fifo_wtrmrk;
1146 	*dsi_pkt_size = pkt_size;
1147 	*dsi_formatter_frame = formatter_frame;
1148 }
1149 
1150 static void mcde_display_enable(struct drm_simple_display_pipe *pipe,
1151 				struct drm_crtc_state *cstate,
1152 				struct drm_plane_state *plane_state)
1153 {
1154 	struct drm_crtc *crtc = &pipe->crtc;
1155 	struct drm_plane *plane = &pipe->plane;
1156 	struct drm_device *drm = crtc->dev;
1157 	struct mcde *mcde = to_mcde(drm);
1158 	const struct drm_display_mode *mode = &cstate->mode;
1159 	struct drm_framebuffer *fb = plane->state->fb;
1160 	u32 format = fb->format->format;
1161 	int dsi_pkt_size;
1162 	int fifo_wtrmrk;
1163 	int cpp = fb->format->cpp[0];
1164 	struct drm_format_name_buf tmp;
1165 	u32 dsi_formatter_frame;
1166 	u32 val;
1167 	int ret;
1168 
1169 	/* This powers up the entire MCDE block and the DSI hardware */
1170 	ret = regulator_enable(mcde->epod);
1171 	if (ret) {
1172 		dev_err(drm->dev, "can't re-enable EPOD regulator\n");
1173 		return;
1174 	}
1175 
1176 	dev_info(drm->dev, "enable MCDE, %d x %d format %s\n",
1177 		 mode->hdisplay, mode->vdisplay,
1178 		 drm_get_format_name(format, &tmp));
1179 
1180 
1181 	/* Clear any pending interrupts */
1182 	mcde_display_disable_irqs(mcde);
1183 	writel(0, mcde->regs + MCDE_IMSCERR);
1184 	writel(0xFFFFFFFF, mcde->regs + MCDE_RISERR);
1185 
1186 	if (mcde->dpi_output)
1187 		mcde_setup_dpi(mcde, mode, &fifo_wtrmrk);
1188 	else
1189 		mcde_setup_dsi(mcde, mode, cpp, &fifo_wtrmrk,
1190 			       &dsi_formatter_frame, &dsi_pkt_size);
1191 
1192 	mcde->stride = mode->hdisplay * cpp;
1193 	dev_dbg(drm->dev, "Overlay line stride: %u bytes\n",
1194 		 mcde->stride);
1195 
1196 	/* Drain the FIFO A + channel 0 pipe so we have a clean slate */
1197 	mcde_drain_pipe(mcde, MCDE_FIFO_A, MCDE_CHANNEL_0);
1198 
1199 	/*
1200 	 * We set up our display pipeline:
1201 	 * EXTSRC 0 -> OVERLAY 0 -> CHANNEL 0 -> FIFO A -> DSI FORMATTER 0
1202 	 *
1203 	 * First configure the external source (memory) on external source 0
1204 	 * using the desired bitstream/bitmap format
1205 	 */
1206 	mcde_configure_extsrc(mcde, MCDE_EXTSRC_0, format);
1207 
1208 	/*
1209 	 * Configure overlay 0 according to format and mode and take input
1210 	 * from external source 0 and route the output of this overlay to
1211 	 * channel 0
1212 	 */
1213 	mcde_configure_overlay(mcde, MCDE_OVERLAY_0, MCDE_EXTSRC_0,
1214 			       MCDE_CHANNEL_0, mode, format, cpp);
1215 
1216 	/*
1217 	 * Configure pixel-per-line and line-per-frame for channel 0 and then
1218 	 * route channel 0 to FIFO A
1219 	 */
1220 	mcde_configure_channel(mcde, MCDE_CHANNEL_0, MCDE_FIFO_A, mode);
1221 
1222 	if (mcde->dpi_output) {
1223 		unsigned long lcd_freq;
1224 
1225 		/* Configure FIFO A to use DPI formatter 0 */
1226 		mcde_configure_fifo(mcde, MCDE_FIFO_A, MCDE_DPI_FORMATTER_0,
1227 				    fifo_wtrmrk);
1228 
1229 		/* Set up and enable the LCD clock */
1230 		lcd_freq = clk_round_rate(mcde->fifoa_clk, mode->clock * 1000);
1231 		ret = clk_set_rate(mcde->fifoa_clk, lcd_freq);
1232 		if (ret)
1233 			dev_err(mcde->dev, "failed to set LCD clock rate %lu Hz\n",
1234 				lcd_freq);
1235 		ret = clk_prepare_enable(mcde->fifoa_clk);
1236 		if (ret) {
1237 			dev_err(mcde->dev, "failed to enable FIFO A DPI clock\n");
1238 			return;
1239 		}
1240 		dev_info(mcde->dev, "LCD FIFO A clk rate %lu Hz\n",
1241 			 clk_get_rate(mcde->fifoa_clk));
1242 	} else {
1243 		/* Configure FIFO A to use DSI formatter 0 */
1244 		mcde_configure_fifo(mcde, MCDE_FIFO_A, MCDE_DSI_FORMATTER_0,
1245 				    fifo_wtrmrk);
1246 
1247 		/*
1248 		 * This brings up the DSI bridge which is tightly connected
1249 		 * to the MCDE DSI formatter.
1250 		 */
1251 		mcde_dsi_enable(mcde->bridge);
1252 
1253 		/* Configure the DSI formatter 0 for the DSI panel output */
1254 		mcde_configure_dsi_formatter(mcde, MCDE_DSI_FORMATTER_0,
1255 					     dsi_formatter_frame, dsi_pkt_size);
1256 	}
1257 
1258 	switch (mcde->flow_mode) {
1259 	case MCDE_COMMAND_TE_FLOW:
1260 	case MCDE_COMMAND_BTA_TE_FLOW:
1261 	case MCDE_VIDEO_TE_FLOW:
1262 		/* We are using TE in some combination */
1263 		if (mode->flags & DRM_MODE_FLAG_NVSYNC)
1264 			val = MCDE_VSCRC_VSPOL;
1265 		else
1266 			val = 0;
1267 		writel(val, mcde->regs + MCDE_VSCRC0);
1268 		/* Enable VSYNC capture on TE0 */
1269 		val = readl(mcde->regs + MCDE_CRC);
1270 		val |= MCDE_CRC_SYCEN0;
1271 		writel(val, mcde->regs + MCDE_CRC);
1272 		break;
1273 	default:
1274 		/* No TE capture */
1275 		break;
1276 	}
1277 
1278 	drm_crtc_vblank_on(crtc);
1279 
1280 	/*
1281 	 * If we're using oneshot mode we don't start the flow
1282 	 * until each time the display is given an update, and
1283 	 * then we disable it immediately after. For all other
1284 	 * modes (command or video) we start the FIFO flow
1285 	 * right here. This is necessary for the hardware to
1286 	 * behave right.
1287 	 */
1288 	if (mcde->flow_mode != MCDE_COMMAND_ONESHOT_FLOW) {
1289 		mcde_enable_fifo(mcde, MCDE_FIFO_A);
1290 		dev_dbg(mcde->dev, "started MCDE video FIFO flow\n");
1291 	}
1292 
1293 	/* Enable MCDE with automatic clock gating */
1294 	val = readl(mcde->regs + MCDE_CR);
1295 	val |= MCDE_CR_MCDEEN | MCDE_CR_AUTOCLKG_EN;
1296 	writel(val, mcde->regs + MCDE_CR);
1297 
1298 	dev_info(drm->dev, "MCDE display is enabled\n");
1299 }
1300 
1301 static void mcde_display_disable(struct drm_simple_display_pipe *pipe)
1302 {
1303 	struct drm_crtc *crtc = &pipe->crtc;
1304 	struct drm_device *drm = crtc->dev;
1305 	struct mcde *mcde = to_mcde(drm);
1306 	struct drm_pending_vblank_event *event;
1307 	int ret;
1308 
1309 	drm_crtc_vblank_off(crtc);
1310 
1311 	/* Disable FIFO A flow */
1312 	mcde_disable_fifo(mcde, MCDE_FIFO_A, true);
1313 
1314 	if (mcde->dpi_output) {
1315 		clk_disable_unprepare(mcde->fifoa_clk);
1316 	} else {
1317 		/* This disables the DSI bridge */
1318 		mcde_dsi_disable(mcde->bridge);
1319 	}
1320 
1321 	event = crtc->state->event;
1322 	if (event) {
1323 		crtc->state->event = NULL;
1324 
1325 		spin_lock_irq(&crtc->dev->event_lock);
1326 		drm_crtc_send_vblank_event(crtc, event);
1327 		spin_unlock_irq(&crtc->dev->event_lock);
1328 	}
1329 
1330 	ret = regulator_disable(mcde->epod);
1331 	if (ret)
1332 		dev_err(drm->dev, "can't disable EPOD regulator\n");
1333 	/* Make sure we are powered down (before we may power up again) */
1334 	usleep_range(50000, 70000);
1335 
1336 	dev_info(drm->dev, "MCDE display is disabled\n");
1337 }
1338 
1339 static void mcde_start_flow(struct mcde *mcde)
1340 {
1341 	/* Request a TE ACK only in TE+BTA mode */
1342 	if (mcde->flow_mode == MCDE_COMMAND_BTA_TE_FLOW)
1343 		mcde_dsi_te_request(mcde->mdsi);
1344 
1345 	/* Enable FIFO A flow */
1346 	mcde_enable_fifo(mcde, MCDE_FIFO_A);
1347 
1348 	/*
1349 	 * If oneshot mode is enabled, the flow will be disabled
1350 	 * when the TE0 IRQ arrives in the interrupt handler. Otherwise
1351 	 * updates are continuously streamed to the display after this
1352 	 * point.
1353 	 */
1354 
1355 	if (mcde->flow_mode == MCDE_COMMAND_ONESHOT_FLOW) {
1356 		/* Trigger a software sync out on channel 0 */
1357 		writel(MCDE_CHNLXSYNCHSW_SW_TRIG,
1358 		       mcde->regs + MCDE_CHNL0SYNCHSW);
1359 
1360 		/*
1361 		 * Disable FIFO A flow again: since we are using TE sync we
1362 		 * need to wait for the FIFO to drain before we continue
1363 		 * so repeated calls to this function will not cause a mess
1364 		 * in the hardware by pushing updates will updates are going
1365 		 * on already.
1366 		 */
1367 		mcde_disable_fifo(mcde, MCDE_FIFO_A, true);
1368 	}
1369 
1370 	dev_dbg(mcde->dev, "started MCDE FIFO flow\n");
1371 }
1372 
1373 static void mcde_set_extsrc(struct mcde *mcde, u32 buffer_address)
1374 {
1375 	/* Write bitmap base address to register */
1376 	writel(buffer_address, mcde->regs + MCDE_EXTSRCXA0);
1377 	/*
1378 	 * Base address for next line this is probably only used
1379 	 * in interlace modes.
1380 	 */
1381 	writel(buffer_address + mcde->stride, mcde->regs + MCDE_EXTSRCXA1);
1382 }
1383 
1384 static void mcde_display_update(struct drm_simple_display_pipe *pipe,
1385 				struct drm_plane_state *old_pstate)
1386 {
1387 	struct drm_crtc *crtc = &pipe->crtc;
1388 	struct drm_device *drm = crtc->dev;
1389 	struct mcde *mcde = to_mcde(drm);
1390 	struct drm_pending_vblank_event *event = crtc->state->event;
1391 	struct drm_plane *plane = &pipe->plane;
1392 	struct drm_plane_state *pstate = plane->state;
1393 	struct drm_framebuffer *fb = pstate->fb;
1394 
1395 	/*
1396 	 * Handle any pending event first, we need to arm the vblank
1397 	 * interrupt before sending any update to the display so we don't
1398 	 * miss the interrupt.
1399 	 */
1400 	if (event) {
1401 		crtc->state->event = NULL;
1402 
1403 		spin_lock_irq(&crtc->dev->event_lock);
1404 		/*
1405 		 * Hardware must be on before we can arm any vblank event,
1406 		 * this is not a scanout controller where there is always
1407 		 * some periodic update going on, it is completely frozen
1408 		 * until we get an update. If MCDE output isn't yet enabled,
1409 		 * we just send a vblank dummy event back.
1410 		 */
1411 		if (crtc->state->active && drm_crtc_vblank_get(crtc) == 0) {
1412 			dev_dbg(mcde->dev, "arm vblank event\n");
1413 			drm_crtc_arm_vblank_event(crtc, event);
1414 		} else {
1415 			dev_dbg(mcde->dev, "insert fake vblank event\n");
1416 			drm_crtc_send_vblank_event(crtc, event);
1417 		}
1418 
1419 		spin_unlock_irq(&crtc->dev->event_lock);
1420 	}
1421 
1422 	/*
1423 	 * We do not start sending framebuffer updates before the
1424 	 * display is enabled. Update events will however be dispatched
1425 	 * from the DRM core before the display is enabled.
1426 	 */
1427 	if (fb) {
1428 		mcde_set_extsrc(mcde, drm_fb_cma_get_gem_addr(fb, pstate, 0));
1429 		dev_info_once(mcde->dev, "first update of display contents\n");
1430 		/*
1431 		 * Usually the flow is already active, unless we are in
1432 		 * oneshot mode, then we need to kick the flow right here.
1433 		 */
1434 		if (mcde->flow_active == 0)
1435 			mcde_start_flow(mcde);
1436 	} else {
1437 		/*
1438 		 * If an update is receieved before the MCDE is enabled
1439 		 * (before mcde_display_enable() is called) we can't really
1440 		 * do much with that buffer.
1441 		 */
1442 		dev_info(mcde->dev, "ignored a display update\n");
1443 	}
1444 }
1445 
1446 static int mcde_display_enable_vblank(struct drm_simple_display_pipe *pipe)
1447 {
1448 	struct drm_crtc *crtc = &pipe->crtc;
1449 	struct drm_device *drm = crtc->dev;
1450 	struct mcde *mcde = to_mcde(drm);
1451 	u32 val;
1452 
1453 	/* Enable all VBLANK IRQs */
1454 	val = MCDE_PP_VCMPA |
1455 		MCDE_PP_VCMPB |
1456 		MCDE_PP_VSCC0 |
1457 		MCDE_PP_VSCC1 |
1458 		MCDE_PP_VCMPC0 |
1459 		MCDE_PP_VCMPC1;
1460 	writel(val, mcde->regs + MCDE_IMSCPP);
1461 
1462 	return 0;
1463 }
1464 
1465 static void mcde_display_disable_vblank(struct drm_simple_display_pipe *pipe)
1466 {
1467 	struct drm_crtc *crtc = &pipe->crtc;
1468 	struct drm_device *drm = crtc->dev;
1469 	struct mcde *mcde = to_mcde(drm);
1470 
1471 	/* Disable all VBLANK IRQs */
1472 	writel(0, mcde->regs + MCDE_IMSCPP);
1473 	/* Clear any pending IRQs */
1474 	writel(0xFFFFFFFF, mcde->regs + MCDE_RISPP);
1475 }
1476 
1477 static struct drm_simple_display_pipe_funcs mcde_display_funcs = {
1478 	.check = mcde_display_check,
1479 	.enable = mcde_display_enable,
1480 	.disable = mcde_display_disable,
1481 	.update = mcde_display_update,
1482 	.enable_vblank = mcde_display_enable_vblank,
1483 	.disable_vblank = mcde_display_disable_vblank,
1484 	.prepare_fb = drm_gem_fb_simple_display_pipe_prepare_fb,
1485 };
1486 
1487 int mcde_display_init(struct drm_device *drm)
1488 {
1489 	struct mcde *mcde = to_mcde(drm);
1490 	int ret;
1491 	static const u32 formats[] = {
1492 		DRM_FORMAT_ARGB8888,
1493 		DRM_FORMAT_ABGR8888,
1494 		DRM_FORMAT_XRGB8888,
1495 		DRM_FORMAT_XBGR8888,
1496 		DRM_FORMAT_RGB888,
1497 		DRM_FORMAT_BGR888,
1498 		DRM_FORMAT_ARGB4444,
1499 		DRM_FORMAT_ABGR4444,
1500 		DRM_FORMAT_XRGB4444,
1501 		DRM_FORMAT_XBGR4444,
1502 		/* These are actually IRGB1555 so intensity bit is lost */
1503 		DRM_FORMAT_XRGB1555,
1504 		DRM_FORMAT_XBGR1555,
1505 		DRM_FORMAT_RGB565,
1506 		DRM_FORMAT_BGR565,
1507 		DRM_FORMAT_YUV422,
1508 	};
1509 
1510 	ret = mcde_init_clock_divider(mcde);
1511 	if (ret)
1512 		return ret;
1513 
1514 	ret = drm_simple_display_pipe_init(drm, &mcde->pipe,
1515 					   &mcde_display_funcs,
1516 					   formats, ARRAY_SIZE(formats),
1517 					   NULL,
1518 					   mcde->connector);
1519 	if (ret)
1520 		return ret;
1521 
1522 	return 0;
1523 }
1524 EXPORT_SYMBOL_GPL(mcde_display_init);
1525