xref: /linux/drivers/gpu/drm/exynos/exynos_drm_plane.c (revision b5bee6ced21ca98389000b7017dd41b0cc37fa50)
1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3  * Copyright (C) 2011 Samsung Electronics Co.Ltd
4  * Authors: Joonyoung Shim <jy0922.shim@samsung.com>
5  */
6 
7 
8 #include <drm/drm_atomic.h>
9 #include <drm/drm_atomic_helper.h>
10 #include <drm/drm_blend.h>
11 #include <drm/drm_framebuffer.h>
12 #include <drm/drm_plane_helper.h>
13 #include <drm/exynos_drm.h>
14 
15 #include "exynos_drm_crtc.h"
16 #include "exynos_drm_drv.h"
17 #include "exynos_drm_fb.h"
18 #include "exynos_drm_gem.h"
19 #include "exynos_drm_plane.h"
20 
21 /*
22  * This function is to get X or Y size shown via screen. This needs length and
23  * start position of CRTC.
24  *
25  *      <--- length --->
26  * CRTC ----------------
27  *      ^ start        ^ end
28  *
29  * There are six cases from a to f.
30  *
31  *             <----- SCREEN ----->
32  *             0                 last
33  *   ----------|------------------|----------
34  * CRTCs
35  * a -------
36  *        b -------
37  *        c --------------------------
38  *                 d --------
39  *                           e -------
40  *                                  f -------
41  */
42 static int exynos_plane_get_size(int start, unsigned length, unsigned last)
43 {
44 	int end = start + length;
45 	int size = 0;
46 
47 	if (start <= 0) {
48 		if (end > 0)
49 			size = min_t(unsigned, end, last);
50 	} else if (start <= last) {
51 		size = min_t(unsigned, last - start, length);
52 	}
53 
54 	return size;
55 }
56 
57 static void exynos_plane_mode_set(struct exynos_drm_plane_state *exynos_state)
58 {
59 	struct drm_plane_state *state = &exynos_state->base;
60 	struct drm_crtc *crtc = state->crtc;
61 	struct drm_crtc_state *crtc_state =
62 			drm_atomic_get_existing_crtc_state(state->state, crtc);
63 	struct drm_display_mode *mode = &crtc_state->adjusted_mode;
64 	int crtc_x, crtc_y;
65 	unsigned int crtc_w, crtc_h;
66 	unsigned int src_x, src_y;
67 	unsigned int src_w, src_h;
68 	unsigned int actual_w;
69 	unsigned int actual_h;
70 
71 	/*
72 	 * The original src/dest coordinates are stored in exynos_state->base,
73 	 * but we want to keep another copy internal to our driver that we can
74 	 * clip/modify ourselves.
75 	 */
76 
77 	crtc_x = state->crtc_x;
78 	crtc_y = state->crtc_y;
79 	crtc_w = state->crtc_w;
80 	crtc_h = state->crtc_h;
81 
82 	src_x = state->src_x >> 16;
83 	src_y = state->src_y >> 16;
84 	src_w = state->src_w >> 16;
85 	src_h = state->src_h >> 16;
86 
87 	/* set ratio */
88 	exynos_state->h_ratio = (src_w << 16) / crtc_w;
89 	exynos_state->v_ratio = (src_h << 16) / crtc_h;
90 
91 	/* clip to visible area */
92 	actual_w = exynos_plane_get_size(crtc_x, crtc_w, mode->hdisplay);
93 	actual_h = exynos_plane_get_size(crtc_y, crtc_h, mode->vdisplay);
94 
95 	if (crtc_x < 0) {
96 		if (actual_w)
97 			src_x += ((-crtc_x) * exynos_state->h_ratio) >> 16;
98 		crtc_x = 0;
99 	}
100 
101 	if (crtc_y < 0) {
102 		if (actual_h)
103 			src_y += ((-crtc_y) * exynos_state->v_ratio) >> 16;
104 		crtc_y = 0;
105 	}
106 
107 	/* set drm framebuffer data. */
108 	exynos_state->src.x = src_x;
109 	exynos_state->src.y = src_y;
110 	exynos_state->src.w = (actual_w * exynos_state->h_ratio) >> 16;
111 	exynos_state->src.h = (actual_h * exynos_state->v_ratio) >> 16;
112 
113 	/* set plane range to be displayed. */
114 	exynos_state->crtc.x = crtc_x;
115 	exynos_state->crtc.y = crtc_y;
116 	exynos_state->crtc.w = actual_w;
117 	exynos_state->crtc.h = actual_h;
118 
119 	DRM_DEV_DEBUG_KMS(crtc->dev->dev,
120 			  "plane : offset_x/y(%d,%d), width/height(%d,%d)",
121 			  exynos_state->crtc.x, exynos_state->crtc.y,
122 			  exynos_state->crtc.w, exynos_state->crtc.h);
123 }
124 
125 static void exynos_drm_plane_reset(struct drm_plane *plane)
126 {
127 	struct exynos_drm_plane *exynos_plane = to_exynos_plane(plane);
128 	struct exynos_drm_plane_state *exynos_state;
129 
130 	if (plane->state) {
131 		exynos_state = to_exynos_plane_state(plane->state);
132 		__drm_atomic_helper_plane_destroy_state(plane->state);
133 		kfree(exynos_state);
134 		plane->state = NULL;
135 	}
136 
137 	exynos_state = kzalloc(sizeof(*exynos_state), GFP_KERNEL);
138 	if (exynos_state) {
139 		__drm_atomic_helper_plane_reset(plane, &exynos_state->base);
140 		plane->state->zpos = exynos_plane->config->zpos;
141 	}
142 }
143 
144 static struct drm_plane_state *
145 exynos_drm_plane_duplicate_state(struct drm_plane *plane)
146 {
147 	struct exynos_drm_plane_state *exynos_state;
148 	struct exynos_drm_plane_state *copy;
149 
150 	exynos_state = to_exynos_plane_state(plane->state);
151 	copy = kzalloc(sizeof(*exynos_state), GFP_KERNEL);
152 	if (!copy)
153 		return NULL;
154 
155 	__drm_atomic_helper_plane_duplicate_state(plane, &copy->base);
156 	return &copy->base;
157 }
158 
159 static void exynos_drm_plane_destroy_state(struct drm_plane *plane,
160 					   struct drm_plane_state *old_state)
161 {
162 	struct exynos_drm_plane_state *old_exynos_state =
163 					to_exynos_plane_state(old_state);
164 	__drm_atomic_helper_plane_destroy_state(old_state);
165 	kfree(old_exynos_state);
166 }
167 
168 static struct drm_plane_funcs exynos_plane_funcs = {
169 	.update_plane	= drm_atomic_helper_update_plane,
170 	.disable_plane	= drm_atomic_helper_disable_plane,
171 	.destroy	= drm_plane_cleanup,
172 	.reset		= exynos_drm_plane_reset,
173 	.atomic_duplicate_state = exynos_drm_plane_duplicate_state,
174 	.atomic_destroy_state = exynos_drm_plane_destroy_state,
175 };
176 
177 static int
178 exynos_drm_plane_check_format(const struct exynos_drm_plane_config *config,
179 			      struct exynos_drm_plane_state *state)
180 {
181 	struct drm_framebuffer *fb = state->base.fb;
182 	struct drm_device *dev = fb->dev;
183 
184 	switch (fb->modifier) {
185 	case DRM_FORMAT_MOD_SAMSUNG_64_32_TILE:
186 		if (!(config->capabilities & EXYNOS_DRM_PLANE_CAP_TILE))
187 			return -ENOTSUPP;
188 		break;
189 
190 	case DRM_FORMAT_MOD_LINEAR:
191 		break;
192 
193 	default:
194 		DRM_DEV_ERROR(dev->dev, "unsupported pixel format modifier");
195 		return -ENOTSUPP;
196 	}
197 
198 	return 0;
199 }
200 
201 static int
202 exynos_drm_plane_check_size(const struct exynos_drm_plane_config *config,
203 			    struct exynos_drm_plane_state *state)
204 {
205 	struct drm_crtc *crtc = state->base.crtc;
206 	bool width_ok = false, height_ok = false;
207 
208 	if (config->capabilities & EXYNOS_DRM_PLANE_CAP_SCALE)
209 		return 0;
210 
211 	if (state->src.w == state->crtc.w)
212 		width_ok = true;
213 
214 	if (state->src.h == state->crtc.h)
215 		height_ok = true;
216 
217 	if ((config->capabilities & EXYNOS_DRM_PLANE_CAP_DOUBLE) &&
218 	    state->h_ratio == (1 << 15))
219 		width_ok = true;
220 
221 	if ((config->capabilities & EXYNOS_DRM_PLANE_CAP_DOUBLE) &&
222 	    state->v_ratio == (1 << 15))
223 		height_ok = true;
224 
225 	if (width_ok && height_ok)
226 		return 0;
227 
228 	DRM_DEV_DEBUG_KMS(crtc->dev->dev, "scaling mode is not supported");
229 	return -ENOTSUPP;
230 }
231 
232 static int exynos_plane_atomic_check(struct drm_plane *plane,
233 				     struct drm_atomic_state *state)
234 {
235 	struct drm_plane_state *new_plane_state = drm_atomic_get_new_plane_state(state,
236 										 plane);
237 	struct exynos_drm_plane *exynos_plane = to_exynos_plane(plane);
238 	struct exynos_drm_plane_state *exynos_state =
239 						to_exynos_plane_state(new_plane_state);
240 	int ret = 0;
241 
242 	if (!new_plane_state->crtc || !new_plane_state->fb)
243 		return 0;
244 
245 	/* translate state into exynos_state */
246 	exynos_plane_mode_set(exynos_state);
247 
248 	ret = exynos_drm_plane_check_format(exynos_plane->config, exynos_state);
249 	if (ret)
250 		return ret;
251 
252 	ret = exynos_drm_plane_check_size(exynos_plane->config, exynos_state);
253 	return ret;
254 }
255 
256 static void exynos_plane_atomic_update(struct drm_plane *plane,
257 				       struct drm_atomic_state *state)
258 {
259 	struct drm_plane_state *new_state = drm_atomic_get_new_plane_state(state,
260 								           plane);
261 	struct exynos_drm_crtc *exynos_crtc = to_exynos_crtc(new_state->crtc);
262 	struct exynos_drm_plane *exynos_plane = to_exynos_plane(plane);
263 
264 	if (!new_state->crtc)
265 		return;
266 
267 	if (exynos_crtc->ops->update_plane)
268 		exynos_crtc->ops->update_plane(exynos_crtc, exynos_plane);
269 }
270 
271 static void exynos_plane_atomic_disable(struct drm_plane *plane,
272 					struct drm_atomic_state *state)
273 {
274 	struct drm_plane_state *old_state = drm_atomic_get_old_plane_state(state, plane);
275 	struct exynos_drm_plane *exynos_plane = to_exynos_plane(plane);
276 	struct exynos_drm_crtc *exynos_crtc = to_exynos_crtc(old_state->crtc);
277 
278 	if (!old_state->crtc)
279 		return;
280 
281 	if (exynos_crtc->ops->disable_plane)
282 		exynos_crtc->ops->disable_plane(exynos_crtc, exynos_plane);
283 }
284 
285 static const struct drm_plane_helper_funcs plane_helper_funcs = {
286 	.atomic_check = exynos_plane_atomic_check,
287 	.atomic_update = exynos_plane_atomic_update,
288 	.atomic_disable = exynos_plane_atomic_disable,
289 };
290 
291 static void exynos_plane_attach_zpos_property(struct drm_plane *plane,
292 					      int zpos, bool immutable)
293 {
294 	if (immutable)
295 		drm_plane_create_zpos_immutable_property(plane, zpos);
296 	else
297 		drm_plane_create_zpos_property(plane, zpos, 0, MAX_PLANE - 1);
298 }
299 
300 int exynos_plane_init(struct drm_device *dev,
301 		      struct exynos_drm_plane *exynos_plane, unsigned int index,
302 		      const struct exynos_drm_plane_config *config)
303 {
304 	int err;
305 	unsigned int supported_modes = BIT(DRM_MODE_BLEND_PIXEL_NONE) |
306 				       BIT(DRM_MODE_BLEND_PREMULTI) |
307 				       BIT(DRM_MODE_BLEND_COVERAGE);
308 	struct drm_plane *plane = &exynos_plane->base;
309 
310 	err = drm_universal_plane_init(dev, &exynos_plane->base,
311 				       1 << dev->mode_config.num_crtc,
312 				       &exynos_plane_funcs,
313 				       config->pixel_formats,
314 				       config->num_pixel_formats,
315 				       NULL, config->type, NULL);
316 	if (err) {
317 		DRM_DEV_ERROR(dev->dev, "failed to initialize plane\n");
318 		return err;
319 	}
320 
321 	drm_plane_helper_add(&exynos_plane->base, &plane_helper_funcs);
322 
323 	exynos_plane->index = index;
324 	exynos_plane->config = config;
325 
326 	exynos_plane_attach_zpos_property(&exynos_plane->base, config->zpos,
327 			   !(config->capabilities & EXYNOS_DRM_PLANE_CAP_ZPOS));
328 
329 	if (config->capabilities & EXYNOS_DRM_PLANE_CAP_PIX_BLEND)
330 		drm_plane_create_blend_mode_property(plane, supported_modes);
331 
332 	if (config->capabilities & EXYNOS_DRM_PLANE_CAP_WIN_BLEND)
333 		drm_plane_create_alpha_property(plane);
334 
335 	return 0;
336 }
337