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