xref: /openbmc/linux/drivers/gpu/drm/omapdrm/omap_fb.c (revision 0edbfea5)
1 /*
2  * drivers/gpu/drm/omapdrm/omap_fb.c
3  *
4  * Copyright (C) 2011 Texas Instruments
5  * Author: Rob Clark <rob@ti.com>
6  *
7  * This program is free software; you can redistribute it and/or modify it
8  * under the terms of the GNU General Public License version 2 as published by
9  * the Free Software Foundation.
10  *
11  * This program is distributed in the hope that it will be useful, but WITHOUT
12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
14  * more details.
15  *
16  * You should have received a copy of the GNU General Public License along with
17  * this program.  If not, see <http://www.gnu.org/licenses/>.
18  */
19 
20 #include <linux/seq_file.h>
21 
22 #include <drm/drm_crtc.h>
23 #include <drm/drm_crtc_helper.h>
24 
25 #include "omap_dmm_tiler.h"
26 #include "omap_drv.h"
27 
28 /*
29  * framebuffer funcs
30  */
31 
32 /* per-format info: */
33 struct format {
34 	enum omap_color_mode dss_format;
35 	uint32_t pixel_format;
36 	struct {
37 		int stride_bpp;           /* this times width is stride */
38 		int sub_y;                /* sub-sample in y dimension */
39 	} planes[4];
40 	bool yuv;
41 };
42 
43 static const struct format formats[] = {
44 	/* 16bpp [A]RGB: */
45 	{ OMAP_DSS_COLOR_RGB16,       DRM_FORMAT_RGB565,   {{2, 1}}, false }, /* RGB16-565 */
46 	{ OMAP_DSS_COLOR_RGB12U,      DRM_FORMAT_RGBX4444, {{2, 1}}, false }, /* RGB12x-4444 */
47 	{ OMAP_DSS_COLOR_RGBX16,      DRM_FORMAT_XRGB4444, {{2, 1}}, false }, /* xRGB12-4444 */
48 	{ OMAP_DSS_COLOR_RGBA16,      DRM_FORMAT_RGBA4444, {{2, 1}}, false }, /* RGBA12-4444 */
49 	{ OMAP_DSS_COLOR_ARGB16,      DRM_FORMAT_ARGB4444, {{2, 1}}, false }, /* ARGB16-4444 */
50 	{ OMAP_DSS_COLOR_XRGB16_1555, DRM_FORMAT_XRGB1555, {{2, 1}}, false }, /* xRGB15-1555 */
51 	{ OMAP_DSS_COLOR_ARGB16_1555, DRM_FORMAT_ARGB1555, {{2, 1}}, false }, /* ARGB16-1555 */
52 	/* 24bpp RGB: */
53 	{ OMAP_DSS_COLOR_RGB24P,      DRM_FORMAT_RGB888,   {{3, 1}}, false }, /* RGB24-888 */
54 	/* 32bpp [A]RGB: */
55 	{ OMAP_DSS_COLOR_RGBX32,      DRM_FORMAT_RGBX8888, {{4, 1}}, false }, /* RGBx24-8888 */
56 	{ OMAP_DSS_COLOR_RGB24U,      DRM_FORMAT_XRGB8888, {{4, 1}}, false }, /* xRGB24-8888 */
57 	{ OMAP_DSS_COLOR_RGBA32,      DRM_FORMAT_RGBA8888, {{4, 1}}, false }, /* RGBA32-8888 */
58 	{ OMAP_DSS_COLOR_ARGB32,      DRM_FORMAT_ARGB8888, {{4, 1}}, false }, /* ARGB32-8888 */
59 	/* YUV: */
60 	{ OMAP_DSS_COLOR_NV12,        DRM_FORMAT_NV12,     {{1, 1}, {1, 2}}, true },
61 	{ OMAP_DSS_COLOR_YUV2,        DRM_FORMAT_YUYV,     {{2, 1}}, true },
62 	{ OMAP_DSS_COLOR_UYVY,        DRM_FORMAT_UYVY,     {{2, 1}}, true },
63 };
64 
65 /* convert from overlay's pixel formats bitmask to an array of fourcc's */
66 uint32_t omap_framebuffer_get_formats(uint32_t *pixel_formats,
67 		uint32_t max_formats, enum omap_color_mode supported_modes)
68 {
69 	uint32_t nformats = 0;
70 	int i = 0;
71 
72 	for (i = 0; i < ARRAY_SIZE(formats) && nformats < max_formats; i++)
73 		if (formats[i].dss_format & supported_modes)
74 			pixel_formats[nformats++] = formats[i].pixel_format;
75 
76 	return nformats;
77 }
78 
79 /* per-plane info for the fb: */
80 struct plane {
81 	struct drm_gem_object *bo;
82 	uint32_t pitch;
83 	uint32_t offset;
84 	dma_addr_t paddr;
85 };
86 
87 #define to_omap_framebuffer(x) container_of(x, struct omap_framebuffer, base)
88 
89 struct omap_framebuffer {
90 	struct drm_framebuffer base;
91 	int pin_count;
92 	const struct format *format;
93 	struct plane planes[4];
94 	/* lock for pinning (pin_count and planes.paddr) */
95 	struct mutex lock;
96 };
97 
98 static int omap_framebuffer_create_handle(struct drm_framebuffer *fb,
99 		struct drm_file *file_priv,
100 		unsigned int *handle)
101 {
102 	struct omap_framebuffer *omap_fb = to_omap_framebuffer(fb);
103 	return drm_gem_handle_create(file_priv,
104 			omap_fb->planes[0].bo, handle);
105 }
106 
107 static void omap_framebuffer_destroy(struct drm_framebuffer *fb)
108 {
109 	struct omap_framebuffer *omap_fb = to_omap_framebuffer(fb);
110 	int i, n = drm_format_num_planes(fb->pixel_format);
111 
112 	DBG("destroy: FB ID: %d (%p)", fb->base.id, fb);
113 
114 	drm_framebuffer_cleanup(fb);
115 
116 	for (i = 0; i < n; i++) {
117 		struct plane *plane = &omap_fb->planes[i];
118 		if (plane->bo)
119 			drm_gem_object_unreference_unlocked(plane->bo);
120 	}
121 
122 	kfree(omap_fb);
123 }
124 
125 static int omap_framebuffer_dirty(struct drm_framebuffer *fb,
126 		struct drm_file *file_priv, unsigned flags, unsigned color,
127 		struct drm_clip_rect *clips, unsigned num_clips)
128 {
129 	return 0;
130 }
131 
132 static const struct drm_framebuffer_funcs omap_framebuffer_funcs = {
133 	.create_handle = omap_framebuffer_create_handle,
134 	.destroy = omap_framebuffer_destroy,
135 	.dirty = omap_framebuffer_dirty,
136 };
137 
138 static uint32_t get_linear_addr(struct plane *plane,
139 		const struct format *format, int n, int x, int y)
140 {
141 	uint32_t offset;
142 
143 	offset = plane->offset +
144 			(x * format->planes[n].stride_bpp) +
145 			(y * plane->pitch / format->planes[n].sub_y);
146 
147 	return plane->paddr + offset;
148 }
149 
150 bool omap_framebuffer_supports_rotation(struct drm_framebuffer *fb)
151 {
152 	struct omap_framebuffer *omap_fb = to_omap_framebuffer(fb);
153 	struct plane *plane = &omap_fb->planes[0];
154 
155 	return omap_gem_flags(plane->bo) & OMAP_BO_TILED;
156 }
157 
158 /* update ovl info for scanout, handles cases of multi-planar fb's, etc.
159  */
160 void omap_framebuffer_update_scanout(struct drm_framebuffer *fb,
161 		struct omap_drm_window *win, struct omap_overlay_info *info)
162 {
163 	struct omap_framebuffer *omap_fb = to_omap_framebuffer(fb);
164 	const struct format *format = omap_fb->format;
165 	struct plane *plane = &omap_fb->planes[0];
166 	uint32_t x, y, orient = 0;
167 
168 	info->color_mode = format->dss_format;
169 
170 	info->pos_x      = win->crtc_x;
171 	info->pos_y      = win->crtc_y;
172 	info->out_width  = win->crtc_w;
173 	info->out_height = win->crtc_h;
174 	info->width      = win->src_w;
175 	info->height     = win->src_h;
176 
177 	x = win->src_x;
178 	y = win->src_y;
179 
180 	if (omap_gem_flags(plane->bo) & OMAP_BO_TILED) {
181 		uint32_t w = win->src_w;
182 		uint32_t h = win->src_h;
183 
184 		switch (win->rotation & DRM_ROTATE_MASK) {
185 		default:
186 			dev_err(fb->dev->dev, "invalid rotation: %02x",
187 					(uint32_t)win->rotation);
188 			/* fallthru to default to no rotation */
189 		case 0:
190 		case BIT(DRM_ROTATE_0):
191 			orient = 0;
192 			break;
193 		case BIT(DRM_ROTATE_90):
194 			orient = MASK_XY_FLIP | MASK_X_INVERT;
195 			break;
196 		case BIT(DRM_ROTATE_180):
197 			orient = MASK_X_INVERT | MASK_Y_INVERT;
198 			break;
199 		case BIT(DRM_ROTATE_270):
200 			orient = MASK_XY_FLIP | MASK_Y_INVERT;
201 			break;
202 		}
203 
204 		if (win->rotation & BIT(DRM_REFLECT_X))
205 			orient ^= MASK_X_INVERT;
206 
207 		if (win->rotation & BIT(DRM_REFLECT_Y))
208 			orient ^= MASK_Y_INVERT;
209 
210 		/* adjust x,y offset for flip/invert: */
211 		if (orient & MASK_XY_FLIP)
212 			swap(w, h);
213 		if (orient & MASK_Y_INVERT)
214 			y += h - 1;
215 		if (orient & MASK_X_INVERT)
216 			x += w - 1;
217 
218 		omap_gem_rotated_paddr(plane->bo, orient, x, y, &info->paddr);
219 		info->rotation_type = OMAP_DSS_ROT_TILER;
220 		info->screen_width  = omap_gem_tiled_stride(plane->bo, orient);
221 	} else {
222 		switch (win->rotation & DRM_ROTATE_MASK) {
223 		case 0:
224 		case BIT(DRM_ROTATE_0):
225 			/* OK */
226 			break;
227 
228 		default:
229 			dev_warn(fb->dev->dev,
230 				"rotation '%d' ignored for non-tiled fb\n",
231 				win->rotation);
232 			win->rotation = 0;
233 			break;
234 		}
235 
236 		info->paddr         = get_linear_addr(plane, format, 0, x, y);
237 		info->rotation_type = OMAP_DSS_ROT_DMA;
238 		info->screen_width  = plane->pitch;
239 	}
240 
241 	/* convert to pixels: */
242 	info->screen_width /= format->planes[0].stride_bpp;
243 
244 	if (format->dss_format == OMAP_DSS_COLOR_NV12) {
245 		plane = &omap_fb->planes[1];
246 
247 		if (info->rotation_type == OMAP_DSS_ROT_TILER) {
248 			WARN_ON(!(omap_gem_flags(plane->bo) & OMAP_BO_TILED));
249 			omap_gem_rotated_paddr(plane->bo, orient,
250 					x/2, y/2, &info->p_uv_addr);
251 		} else {
252 			info->p_uv_addr = get_linear_addr(plane, format, 1, x, y);
253 		}
254 	} else {
255 		info->p_uv_addr = 0;
256 	}
257 }
258 
259 /* pin, prepare for scanout: */
260 int omap_framebuffer_pin(struct drm_framebuffer *fb)
261 {
262 	struct omap_framebuffer *omap_fb = to_omap_framebuffer(fb);
263 	int ret, i, n = drm_format_num_planes(fb->pixel_format);
264 
265 	mutex_lock(&omap_fb->lock);
266 
267 	if (omap_fb->pin_count > 0) {
268 		omap_fb->pin_count++;
269 		mutex_unlock(&omap_fb->lock);
270 		return 0;
271 	}
272 
273 	for (i = 0; i < n; i++) {
274 		struct plane *plane = &omap_fb->planes[i];
275 		ret = omap_gem_get_paddr(plane->bo, &plane->paddr, true);
276 		if (ret)
277 			goto fail;
278 		omap_gem_dma_sync(plane->bo, DMA_TO_DEVICE);
279 	}
280 
281 	omap_fb->pin_count++;
282 
283 	mutex_unlock(&omap_fb->lock);
284 
285 	return 0;
286 
287 fail:
288 	for (i--; i >= 0; i--) {
289 		struct plane *plane = &omap_fb->planes[i];
290 		omap_gem_put_paddr(plane->bo);
291 		plane->paddr = 0;
292 	}
293 
294 	mutex_unlock(&omap_fb->lock);
295 
296 	return ret;
297 }
298 
299 /* unpin, no longer being scanned out: */
300 void omap_framebuffer_unpin(struct drm_framebuffer *fb)
301 {
302 	struct omap_framebuffer *omap_fb = to_omap_framebuffer(fb);
303 	int i, n = drm_format_num_planes(fb->pixel_format);
304 
305 	mutex_lock(&omap_fb->lock);
306 
307 	omap_fb->pin_count--;
308 
309 	if (omap_fb->pin_count > 0) {
310 		mutex_unlock(&omap_fb->lock);
311 		return;
312 	}
313 
314 	for (i = 0; i < n; i++) {
315 		struct plane *plane = &omap_fb->planes[i];
316 		omap_gem_put_paddr(plane->bo);
317 		plane->paddr = 0;
318 	}
319 
320 	mutex_unlock(&omap_fb->lock);
321 }
322 
323 struct drm_gem_object *omap_framebuffer_bo(struct drm_framebuffer *fb, int p)
324 {
325 	struct omap_framebuffer *omap_fb = to_omap_framebuffer(fb);
326 	if (p >= drm_format_num_planes(fb->pixel_format))
327 		return NULL;
328 	return omap_fb->planes[p].bo;
329 }
330 
331 /* iterate thru all the connectors, returning ones that are attached
332  * to the same fb..
333  */
334 struct drm_connector *omap_framebuffer_get_next_connector(
335 		struct drm_framebuffer *fb, struct drm_connector *from)
336 {
337 	struct drm_device *dev = fb->dev;
338 	struct list_head *connector_list = &dev->mode_config.connector_list;
339 	struct drm_connector *connector = from;
340 
341 	if (!from)
342 		return list_first_entry_or_null(connector_list, typeof(*from),
343 						head);
344 
345 	list_for_each_entry_from(connector, connector_list, head) {
346 		if (connector != from) {
347 			struct drm_encoder *encoder = connector->encoder;
348 			struct drm_crtc *crtc = encoder ? encoder->crtc : NULL;
349 			if (crtc && crtc->primary->fb == fb)
350 				return connector;
351 
352 		}
353 	}
354 
355 	return NULL;
356 }
357 
358 #ifdef CONFIG_DEBUG_FS
359 void omap_framebuffer_describe(struct drm_framebuffer *fb, struct seq_file *m)
360 {
361 	struct omap_framebuffer *omap_fb = to_omap_framebuffer(fb);
362 	int i, n = drm_format_num_planes(fb->pixel_format);
363 
364 	seq_printf(m, "fb: %dx%d@%4.4s\n", fb->width, fb->height,
365 			(char *)&fb->pixel_format);
366 
367 	for (i = 0; i < n; i++) {
368 		struct plane *plane = &omap_fb->planes[i];
369 		seq_printf(m, "   %d: offset=%d pitch=%d, obj: ",
370 				i, plane->offset, plane->pitch);
371 		omap_gem_describe(plane->bo, m);
372 	}
373 }
374 #endif
375 
376 struct drm_framebuffer *omap_framebuffer_create(struct drm_device *dev,
377 		struct drm_file *file, const struct drm_mode_fb_cmd2 *mode_cmd)
378 {
379 	struct drm_gem_object *bos[4];
380 	struct drm_framebuffer *fb;
381 	int ret;
382 
383 	ret = objects_lookup(file, mode_cmd->pixel_format,
384 			bos, mode_cmd->handles);
385 	if (ret)
386 		return ERR_PTR(ret);
387 
388 	fb = omap_framebuffer_init(dev, mode_cmd, bos);
389 	if (IS_ERR(fb)) {
390 		int i, n = drm_format_num_planes(mode_cmd->pixel_format);
391 		for (i = 0; i < n; i++)
392 			drm_gem_object_unreference_unlocked(bos[i]);
393 		return fb;
394 	}
395 	return fb;
396 }
397 
398 struct drm_framebuffer *omap_framebuffer_init(struct drm_device *dev,
399 		const struct drm_mode_fb_cmd2 *mode_cmd, struct drm_gem_object **bos)
400 {
401 	struct omap_framebuffer *omap_fb = NULL;
402 	struct drm_framebuffer *fb = NULL;
403 	const struct format *format = NULL;
404 	int ret, i, n = drm_format_num_planes(mode_cmd->pixel_format);
405 
406 	DBG("create framebuffer: dev=%p, mode_cmd=%p (%dx%d@%4.4s)",
407 			dev, mode_cmd, mode_cmd->width, mode_cmd->height,
408 			(char *)&mode_cmd->pixel_format);
409 
410 	for (i = 0; i < ARRAY_SIZE(formats); i++) {
411 		if (formats[i].pixel_format == mode_cmd->pixel_format) {
412 			format = &formats[i];
413 			break;
414 		}
415 	}
416 
417 	if (!format) {
418 		dev_err(dev->dev, "unsupported pixel format: %4.4s\n",
419 				(char *)&mode_cmd->pixel_format);
420 		ret = -EINVAL;
421 		goto fail;
422 	}
423 
424 	omap_fb = kzalloc(sizeof(*omap_fb), GFP_KERNEL);
425 	if (!omap_fb) {
426 		ret = -ENOMEM;
427 		goto fail;
428 	}
429 
430 	fb = &omap_fb->base;
431 	omap_fb->format = format;
432 	mutex_init(&omap_fb->lock);
433 
434 	for (i = 0; i < n; i++) {
435 		struct plane *plane = &omap_fb->planes[i];
436 		int size, pitch = mode_cmd->pitches[i];
437 
438 		if (pitch < (mode_cmd->width * format->planes[i].stride_bpp)) {
439 			dev_err(dev->dev, "provided buffer pitch is too small! %d < %d\n",
440 					pitch, mode_cmd->width * format->planes[i].stride_bpp);
441 			ret = -EINVAL;
442 			goto fail;
443 		}
444 
445 		if (pitch % format->planes[i].stride_bpp != 0) {
446 			dev_err(dev->dev,
447 				"buffer pitch (%d bytes) is not a multiple of pixel size (%d bytes)\n",
448 				pitch, format->planes[i].stride_bpp);
449 			ret = -EINVAL;
450 			goto fail;
451 		}
452 
453 		size = pitch * mode_cmd->height / format->planes[i].sub_y;
454 
455 		if (size > (omap_gem_mmap_size(bos[i]) - mode_cmd->offsets[i])) {
456 			dev_err(dev->dev, "provided buffer object is too small! %d < %d\n",
457 					bos[i]->size - mode_cmd->offsets[i], size);
458 			ret = -EINVAL;
459 			goto fail;
460 		}
461 
462 		if (i > 0 && pitch != mode_cmd->pitches[i - 1]) {
463 			dev_err(dev->dev,
464 				"pitches are not the same between framebuffer planes %d != %d\n",
465 				pitch, mode_cmd->pitches[i - 1]);
466 			ret = -EINVAL;
467 			goto fail;
468 		}
469 
470 		plane->bo     = bos[i];
471 		plane->offset = mode_cmd->offsets[i];
472 		plane->pitch  = pitch;
473 		plane->paddr  = 0;
474 	}
475 
476 	drm_helper_mode_fill_fb_struct(fb, mode_cmd);
477 
478 	ret = drm_framebuffer_init(dev, fb, &omap_framebuffer_funcs);
479 	if (ret) {
480 		dev_err(dev->dev, "framebuffer init failed: %d\n", ret);
481 		goto fail;
482 	}
483 
484 	DBG("create: FB ID: %d (%p)", fb->base.id, fb);
485 
486 	return fb;
487 
488 fail:
489 	kfree(omap_fb);
490 
491 	return ERR_PTR(ret);
492 }
493