1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3  * Copyright (C) 2011 Texas Instruments Incorporated - https://www.ti.com/
4  * Author: Rob Clark <rob@ti.com>
5  */
6 
7 #include <linux/dma-mapping.h>
8 
9 #include <drm/drm_blend.h>
10 #include <drm/drm_modeset_helper.h>
11 #include <drm/drm_fourcc.h>
12 #include <drm/drm_framebuffer.h>
13 #include <drm/drm_gem_framebuffer_helper.h>
14 
15 #include "omap_dmm_tiler.h"
16 #include "omap_drv.h"
17 
18 /*
19  * framebuffer funcs
20  */
21 
22 static const u32 formats[] = {
23 	/* 16bpp [A]RGB: */
24 	DRM_FORMAT_RGB565, /* RGB16-565 */
25 	DRM_FORMAT_RGBX4444, /* RGB12x-4444 */
26 	DRM_FORMAT_XRGB4444, /* xRGB12-4444 */
27 	DRM_FORMAT_RGBA4444, /* RGBA12-4444 */
28 	DRM_FORMAT_ARGB4444, /* ARGB16-4444 */
29 	DRM_FORMAT_XRGB1555, /* xRGB15-1555 */
30 	DRM_FORMAT_ARGB1555, /* ARGB16-1555 */
31 	/* 24bpp RGB: */
32 	DRM_FORMAT_RGB888,   /* RGB24-888 */
33 	/* 32bpp [A]RGB: */
34 	DRM_FORMAT_RGBX8888, /* RGBx24-8888 */
35 	DRM_FORMAT_XRGB8888, /* xRGB24-8888 */
36 	DRM_FORMAT_RGBA8888, /* RGBA32-8888 */
37 	DRM_FORMAT_ARGB8888, /* ARGB32-8888 */
38 	/* YUV: */
39 	DRM_FORMAT_NV12,
40 	DRM_FORMAT_YUYV,
41 	DRM_FORMAT_UYVY,
42 };
43 
44 /* per-plane info for the fb: */
45 struct plane {
46 	dma_addr_t dma_addr;
47 };
48 
49 #define to_omap_framebuffer(x) container_of(x, struct omap_framebuffer, base)
50 
51 struct omap_framebuffer {
52 	struct drm_framebuffer base;
53 	int pin_count;
54 	const struct drm_format_info *format;
55 	struct plane planes[2];
56 	/* lock for pinning (pin_count and planes.dma_addr) */
57 	struct mutex lock;
58 };
59 
omap_framebuffer_dirty(struct drm_framebuffer * fb,struct drm_file * file_priv,unsigned flags,unsigned color,struct drm_clip_rect * clips,unsigned num_clips)60 static int omap_framebuffer_dirty(struct drm_framebuffer *fb,
61 				  struct drm_file *file_priv,
62 				  unsigned flags, unsigned color,
63 				  struct drm_clip_rect *clips,
64 				  unsigned num_clips)
65 {
66 	struct drm_crtc *crtc;
67 
68 	drm_modeset_lock_all(fb->dev);
69 
70 	drm_for_each_crtc(crtc, fb->dev)
71 		omap_crtc_flush(crtc);
72 
73 	drm_modeset_unlock_all(fb->dev);
74 
75 	return 0;
76 }
77 
78 static const struct drm_framebuffer_funcs omap_framebuffer_funcs = {
79 	.create_handle = drm_gem_fb_create_handle,
80 	.dirty = omap_framebuffer_dirty,
81 	.destroy = drm_gem_fb_destroy,
82 };
83 
get_linear_addr(struct drm_framebuffer * fb,const struct drm_format_info * format,int n,int x,int y)84 static u32 get_linear_addr(struct drm_framebuffer *fb,
85 		const struct drm_format_info *format, int n, int x, int y)
86 {
87 	struct omap_framebuffer *omap_fb = to_omap_framebuffer(fb);
88 	struct plane *plane = &omap_fb->planes[n];
89 	u32 offset;
90 
91 	offset = fb->offsets[n]
92 	       + (x * format->cpp[n] / (n == 0 ? 1 : format->hsub))
93 	       + (y * fb->pitches[n] / (n == 0 ? 1 : format->vsub));
94 
95 	return plane->dma_addr + offset;
96 }
97 
omap_framebuffer_supports_rotation(struct drm_framebuffer * fb)98 bool omap_framebuffer_supports_rotation(struct drm_framebuffer *fb)
99 {
100 	return omap_gem_flags(fb->obj[0]) & OMAP_BO_TILED_MASK;
101 }
102 
103 /* Note: DRM rotates counter-clockwise, TILER & DSS rotates clockwise */
drm_rotation_to_tiler(unsigned int drm_rot)104 static u32 drm_rotation_to_tiler(unsigned int drm_rot)
105 {
106 	u32 orient;
107 
108 	switch (drm_rot & DRM_MODE_ROTATE_MASK) {
109 	default:
110 	case DRM_MODE_ROTATE_0:
111 		orient = 0;
112 		break;
113 	case DRM_MODE_ROTATE_90:
114 		orient = MASK_XY_FLIP | MASK_X_INVERT;
115 		break;
116 	case DRM_MODE_ROTATE_180:
117 		orient = MASK_X_INVERT | MASK_Y_INVERT;
118 		break;
119 	case DRM_MODE_ROTATE_270:
120 		orient = MASK_XY_FLIP | MASK_Y_INVERT;
121 		break;
122 	}
123 
124 	if (drm_rot & DRM_MODE_REFLECT_X)
125 		orient ^= MASK_X_INVERT;
126 
127 	if (drm_rot & DRM_MODE_REFLECT_Y)
128 		orient ^= MASK_Y_INVERT;
129 
130 	return orient;
131 }
132 
133 /* update ovl info for scanout, handles cases of multi-planar fb's, etc.
134  */
omap_framebuffer_update_scanout(struct drm_framebuffer * fb,struct drm_plane_state * state,struct omap_overlay_info * info,struct omap_overlay_info * r_info)135 void omap_framebuffer_update_scanout(struct drm_framebuffer *fb,
136 		struct drm_plane_state *state,
137 		struct omap_overlay_info *info,
138 		struct omap_overlay_info *r_info)
139 {
140 	struct omap_framebuffer *omap_fb = to_omap_framebuffer(fb);
141 	const struct drm_format_info *format = omap_fb->format;
142 	u32 x, y, orient = 0;
143 
144 	info->fourcc = fb->format->format;
145 
146 	info->pos_x      = state->crtc_x;
147 	info->pos_y      = state->crtc_y;
148 	info->out_width  = state->crtc_w;
149 	info->out_height = state->crtc_h;
150 	info->width      = state->src_w >> 16;
151 	info->height     = state->src_h >> 16;
152 
153 	/* DSS driver wants the w & h in rotated orientation */
154 	if (drm_rotation_90_or_270(state->rotation))
155 		swap(info->width, info->height);
156 
157 	x = state->src_x >> 16;
158 	y = state->src_y >> 16;
159 
160 	if (omap_gem_flags(fb->obj[0]) & OMAP_BO_TILED_MASK) {
161 		u32 w = state->src_w >> 16;
162 		u32 h = state->src_h >> 16;
163 
164 		orient = drm_rotation_to_tiler(state->rotation);
165 
166 		/*
167 		 * omap_gem_rotated_paddr() wants the x & y in tiler units.
168 		 * Usually tiler unit size is the same as the pixel size, except
169 		 * for YUV422 formats, for which the tiler unit size is 32 bits
170 		 * and pixel size is 16 bits.
171 		 */
172 		if (fb->format->format == DRM_FORMAT_UYVY ||
173 				fb->format->format == DRM_FORMAT_YUYV) {
174 			x /= 2;
175 			w /= 2;
176 		}
177 
178 		/* adjust x,y offset for invert: */
179 		if (orient & MASK_Y_INVERT)
180 			y += h - 1;
181 		if (orient & MASK_X_INVERT)
182 			x += w - 1;
183 
184 		/* Note: x and y are in TILER units, not pixels */
185 		omap_gem_rotated_dma_addr(fb->obj[0], orient, x, y,
186 					  &info->paddr);
187 		info->rotation_type = OMAP_DSS_ROT_TILER;
188 		info->rotation = state->rotation ?: DRM_MODE_ROTATE_0;
189 		/* Note: stride in TILER units, not pixels */
190 		info->screen_width  = omap_gem_tiled_stride(fb->obj[0], orient);
191 	} else {
192 		switch (state->rotation & DRM_MODE_ROTATE_MASK) {
193 		case 0:
194 		case DRM_MODE_ROTATE_0:
195 			/* OK */
196 			break;
197 
198 		default:
199 			dev_warn(fb->dev->dev,
200 				"rotation '%d' ignored for non-tiled fb\n",
201 				state->rotation);
202 			break;
203 		}
204 
205 		info->paddr         = get_linear_addr(fb, format, 0, x, y);
206 		info->rotation_type = OMAP_DSS_ROT_NONE;
207 		info->rotation      = DRM_MODE_ROTATE_0;
208 		info->screen_width  = fb->pitches[0];
209 	}
210 
211 	/* convert to pixels: */
212 	info->screen_width /= format->cpp[0];
213 
214 	if (fb->format->format == DRM_FORMAT_NV12) {
215 		if (info->rotation_type == OMAP_DSS_ROT_TILER) {
216 			WARN_ON(!(omap_gem_flags(fb->obj[1]) & OMAP_BO_TILED_MASK));
217 			omap_gem_rotated_dma_addr(fb->obj[1], orient, x/2, y/2,
218 						  &info->p_uv_addr);
219 		} else {
220 			info->p_uv_addr = get_linear_addr(fb, format, 1, x, y);
221 		}
222 	} else {
223 		info->p_uv_addr = 0;
224 	}
225 
226 	if (r_info) {
227 		info->width /= 2;
228 		info->out_width /= 2;
229 
230 		*r_info = *info;
231 
232 		if (fb->format->is_yuv) {
233 			if (info->width & 1) {
234 				info->width++;
235 				r_info->width--;
236 			}
237 
238 			if (info->out_width & 1) {
239 				info->out_width++;
240 				r_info->out_width--;
241 			}
242 		}
243 
244 		r_info->pos_x = info->pos_x + info->out_width;
245 
246 		r_info->paddr =	get_linear_addr(fb, format, 0,
247 						x + info->width, y);
248 		if (fb->format->format == DRM_FORMAT_NV12) {
249 			r_info->p_uv_addr =
250 				get_linear_addr(fb, format, 1,
251 						x + info->width, y);
252 		}
253 	}
254 }
255 
256 /* pin, prepare for scanout: */
omap_framebuffer_pin(struct drm_framebuffer * fb)257 int omap_framebuffer_pin(struct drm_framebuffer *fb)
258 {
259 	struct omap_framebuffer *omap_fb = to_omap_framebuffer(fb);
260 	int ret, i, n = fb->format->num_planes;
261 
262 	mutex_lock(&omap_fb->lock);
263 
264 	if (omap_fb->pin_count > 0) {
265 		omap_fb->pin_count++;
266 		mutex_unlock(&omap_fb->lock);
267 		return 0;
268 	}
269 
270 	for (i = 0; i < n; i++) {
271 		struct plane *plane = &omap_fb->planes[i];
272 		ret = omap_gem_pin(fb->obj[i], &plane->dma_addr);
273 		if (ret)
274 			goto fail;
275 		omap_gem_dma_sync_buffer(fb->obj[i], DMA_TO_DEVICE);
276 	}
277 
278 	omap_fb->pin_count++;
279 
280 	mutex_unlock(&omap_fb->lock);
281 
282 	return 0;
283 
284 fail:
285 	for (i--; i >= 0; i--) {
286 		struct plane *plane = &omap_fb->planes[i];
287 		omap_gem_unpin(fb->obj[i]);
288 		plane->dma_addr = 0;
289 	}
290 
291 	mutex_unlock(&omap_fb->lock);
292 
293 	return ret;
294 }
295 
296 /* unpin, no longer being scanned out: */
omap_framebuffer_unpin(struct drm_framebuffer * fb)297 void omap_framebuffer_unpin(struct drm_framebuffer *fb)
298 {
299 	struct omap_framebuffer *omap_fb = to_omap_framebuffer(fb);
300 	int i, n = fb->format->num_planes;
301 
302 	mutex_lock(&omap_fb->lock);
303 
304 	omap_fb->pin_count--;
305 
306 	if (omap_fb->pin_count > 0) {
307 		mutex_unlock(&omap_fb->lock);
308 		return;
309 	}
310 
311 	for (i = 0; i < n; i++) {
312 		struct plane *plane = &omap_fb->planes[i];
313 		omap_gem_unpin(fb->obj[i]);
314 		plane->dma_addr = 0;
315 	}
316 
317 	mutex_unlock(&omap_fb->lock);
318 }
319 
320 #ifdef CONFIG_DEBUG_FS
omap_framebuffer_describe(struct drm_framebuffer * fb,struct seq_file * m)321 void omap_framebuffer_describe(struct drm_framebuffer *fb, struct seq_file *m)
322 {
323 	int i, n = fb->format->num_planes;
324 
325 	seq_printf(m, "fb: %dx%d@%4.4s\n", fb->width, fb->height,
326 			(char *)&fb->format->format);
327 
328 	for (i = 0; i < n; i++) {
329 		seq_printf(m, "   %d: offset=%d pitch=%d, obj: ",
330 				i, fb->offsets[n], fb->pitches[i]);
331 		omap_gem_describe(fb->obj[i], m);
332 	}
333 }
334 #endif
335 
omap_framebuffer_create(struct drm_device * dev,struct drm_file * file,const struct drm_mode_fb_cmd2 * mode_cmd)336 struct drm_framebuffer *omap_framebuffer_create(struct drm_device *dev,
337 		struct drm_file *file, const struct drm_mode_fb_cmd2 *mode_cmd)
338 {
339 	const struct drm_format_info *info = drm_get_format_info(dev,
340 								 mode_cmd);
341 	unsigned int num_planes = info->num_planes;
342 	struct drm_gem_object *bos[4];
343 	struct drm_framebuffer *fb;
344 	int i;
345 
346 	for (i = 0; i < num_planes; i++) {
347 		bos[i] = drm_gem_object_lookup(file, mode_cmd->handles[i]);
348 		if (!bos[i]) {
349 			fb = ERR_PTR(-ENOENT);
350 			goto error;
351 		}
352 	}
353 
354 	fb = omap_framebuffer_init(dev, mode_cmd, bos);
355 	if (IS_ERR(fb))
356 		goto error;
357 
358 	return fb;
359 
360 error:
361 	while (--i >= 0)
362 		drm_gem_object_put(bos[i]);
363 
364 	return fb;
365 }
366 
omap_framebuffer_init(struct drm_device * dev,const struct drm_mode_fb_cmd2 * mode_cmd,struct drm_gem_object ** bos)367 struct drm_framebuffer *omap_framebuffer_init(struct drm_device *dev,
368 		const struct drm_mode_fb_cmd2 *mode_cmd, struct drm_gem_object **bos)
369 {
370 	const struct drm_format_info *format = NULL;
371 	struct omap_framebuffer *omap_fb = NULL;
372 	struct drm_framebuffer *fb = NULL;
373 	unsigned int pitch = mode_cmd->pitches[0];
374 	int ret, i;
375 
376 	DBG("create framebuffer: dev=%p, mode_cmd=%p (%dx%d@%4.4s)",
377 			dev, mode_cmd, mode_cmd->width, mode_cmd->height,
378 			(char *)&mode_cmd->pixel_format);
379 
380 	format = drm_get_format_info(dev, mode_cmd);
381 
382 	for (i = 0; i < ARRAY_SIZE(formats); i++) {
383 		if (formats[i] == mode_cmd->pixel_format)
384 			break;
385 	}
386 
387 	if (!format || i == ARRAY_SIZE(formats)) {
388 		dev_dbg(dev->dev, "unsupported pixel format: %4.4s\n",
389 			(char *)&mode_cmd->pixel_format);
390 		ret = -EINVAL;
391 		goto fail;
392 	}
393 
394 	omap_fb = kzalloc(sizeof(*omap_fb), GFP_KERNEL);
395 	if (!omap_fb) {
396 		ret = -ENOMEM;
397 		goto fail;
398 	}
399 
400 	fb = &omap_fb->base;
401 	omap_fb->format = format;
402 	mutex_init(&omap_fb->lock);
403 
404 	/*
405 	 * The code below assumes that no format use more than two planes, and
406 	 * that the two planes of multiplane formats need the same number of
407 	 * bytes per pixel.
408 	 */
409 	if (format->num_planes == 2 && pitch != mode_cmd->pitches[1]) {
410 		dev_dbg(dev->dev, "pitches differ between planes 0 and 1\n");
411 		ret = -EINVAL;
412 		goto fail;
413 	}
414 
415 	if (pitch % format->cpp[0]) {
416 		dev_dbg(dev->dev,
417 			"buffer pitch (%u bytes) is not a multiple of pixel size (%u bytes)\n",
418 			pitch, format->cpp[0]);
419 		ret = -EINVAL;
420 		goto fail;
421 	}
422 
423 	for (i = 0; i < format->num_planes; i++) {
424 		struct plane *plane = &omap_fb->planes[i];
425 		unsigned int vsub = i == 0 ? 1 : format->vsub;
426 		unsigned int size;
427 
428 		size = pitch * mode_cmd->height / vsub;
429 
430 		if (size > omap_gem_mmap_size(bos[i]) - mode_cmd->offsets[i]) {
431 			dev_dbg(dev->dev,
432 				"provided buffer object is too small! %zu < %d\n",
433 				bos[i]->size - mode_cmd->offsets[i], size);
434 			ret = -EINVAL;
435 			goto fail;
436 		}
437 
438 		fb->obj[i]    = bos[i];
439 		plane->dma_addr  = 0;
440 	}
441 
442 	drm_helper_mode_fill_fb_struct(dev, fb, mode_cmd);
443 
444 	ret = drm_framebuffer_init(dev, fb, &omap_framebuffer_funcs);
445 	if (ret) {
446 		dev_err(dev->dev, "framebuffer init failed: %d\n", ret);
447 		goto fail;
448 	}
449 
450 	DBG("create: FB ID: %d (%p)", fb->base.id, fb);
451 
452 	return fb;
453 
454 fail:
455 	kfree(omap_fb);
456 
457 	return ERR_PTR(ret);
458 }
459