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