summaryrefslogtreecommitdiffstats
path: root/drivers/gpu/drm/exynos/exynos_drm_plane.c
blob: 7098c6d35266bd1116e3be83feabc836bad30cb8 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
/*
 * Copyright (C) 2011 Samsung Electronics Co.Ltd
 * Authors: Joonyoung Shim <jy0922.shim@samsung.com>
 *
 * This program is free software; you can redistribute  it and/or modify it
 * under  the terms of  the GNU General  Public License as published by the
 * Free Software Foundation;  either version 2 of the  License, or (at your
 * option) any later version.
 *
 */

#include <drm/drmP.h>

#include <drm/drm_atomic.h>
#include <drm/drm_atomic_helper.h>
#include <drm/drm_plane_helper.h>
#include <drm/exynos_drm.h>
#include "exynos_drm_drv.h"
#include "exynos_drm_crtc.h"
#include "exynos_drm_fb.h"
#include "exynos_drm_gem.h"
#include "exynos_drm_plane.h"

/*
 * This function is to get X or Y size shown via screen. This needs length and
 * start position of CRTC.
 *
 *      <--- length --->
 * CRTC ----------------
 *      ^ start        ^ end
 *
 * There are six cases from a to f.
 *
 *             <----- SCREEN ----->
 *             0                 last
 *   ----------|------------------|----------
 * CRTCs
 * a -------
 *        b -------
 *        c --------------------------
 *                 d --------
 *                           e -------
 *                                  f -------
 */
static int exynos_plane_get_size(int start, unsigned length, unsigned last)
{
	int end = start + length;
	int size = 0;

	if (start <= 0) {
		if (end > 0)
			size = min_t(unsigned, end, last);
	} else if (start <= last) {
		size = min_t(unsigned, last - start, length);
	}

	return size;
}

static void exynos_plane_mode_set(struct exynos_drm_plane_state *exynos_state)
{
	struct drm_plane_state *state = &exynos_state->base;
	struct drm_crtc *crtc = state->crtc;
	struct drm_crtc_state *crtc_state =
			drm_atomic_get_existing_crtc_state(state->state, crtc);
	struct drm_display_mode *mode = &crtc_state->adjusted_mode;
	int crtc_x, crtc_y;
	unsigned int crtc_w, crtc_h;
	unsigned int src_x, src_y;
	unsigned int src_w, src_h;
	unsigned int actual_w;
	unsigned int actual_h;

	/*
	 * The original src/dest coordinates are stored in exynos_state->base,
	 * but we want to keep another copy internal to our driver that we can
	 * clip/modify ourselves.
	 */

	crtc_x = state->crtc_x;
	crtc_y = state->crtc_y;
	crtc_w = state->crtc_w;
	crtc_h = state->crtc_h;

	src_x = state->src_x >> 16;
	src_y = state->src_y >> 16;
	src_w = state->src_w >> 16;
	src_h = state->src_h >> 16;

	/* set ratio */
	exynos_state->h_ratio = (src_w << 16) / crtc_w;
	exynos_state->v_ratio = (src_h << 16) / crtc_h;

	/* clip to visible area */
	actual_w = exynos_plane_get_size(crtc_x, crtc_w, mode->hdisplay);
	actual_h = exynos_plane_get_size(crtc_y, crtc_h, mode->vdisplay);

	if (crtc_x < 0) {
		if (actual_w)
			src_x += ((-crtc_x) * exynos_state->h_ratio) >> 16;
		crtc_x = 0;
	}

	if (crtc_y < 0) {
		if (actual_h)
			src_y += ((-crtc_y) * exynos_state->v_ratio) >> 16;
		crtc_y = 0;
	}

	/* set drm framebuffer data. */
	exynos_state->src.x = src_x;
	exynos_state->src.y = src_y;
	exynos_state->src.w = (actual_w * exynos_state->h_ratio) >> 16;
	exynos_state->src.h = (actual_h * exynos_state->v_ratio) >> 16;

	/* set plane range to be displayed. */
	exynos_state->crtc.x = crtc_x;
	exynos_state->crtc.y = crtc_y;
	exynos_state->crtc.w = actual_w;
	exynos_state->crtc.h = actual_h;

	DRM_DEBUG_KMS("plane : offset_x/y(%d,%d), width/height(%d,%d)",
			exynos_state->crtc.x, exynos_state->crtc.y,
			exynos_state->crtc.w, exynos_state->crtc.h);
}

static void exynos_drm_plane_reset(struct drm_plane *plane)
{
	struct exynos_drm_plane *exynos_plane = to_exynos_plane(plane);
	struct exynos_drm_plane_state *exynos_state;

	if (plane->state) {
		exynos_state = to_exynos_plane_state(plane->state);
		if (exynos_state->base.fb)
			drm_framebuffer_put(exynos_state->base.fb);
		kfree(exynos_state);
		plane->state = NULL;
	}

	exynos_state = kzalloc(sizeof(*exynos_state), GFP_KERNEL);
	if (exynos_state) {
		plane->state = &exynos_state->base;
		plane->state->plane = plane;
		plane->state->zpos = exynos_plane->config->zpos;
	}
}

static struct drm_plane_state *
exynos_drm_plane_duplicate_state(struct drm_plane *plane)
{
	struct exynos_drm_plane_state *exynos_state;
	struct exynos_drm_plane_state *copy;

	exynos_state = to_exynos_plane_state(plane->state);
	copy = kzalloc(sizeof(*exynos_state), GFP_KERNEL);
	if (!copy)
		return NULL;

	__drm_atomic_helper_plane_duplicate_state(plane, &copy->base);
	return &copy->base;
}

static void exynos_drm_plane_destroy_state(struct drm_plane *plane,
					   struct drm_plane_state *old_state)
{
	struct exynos_drm_plane_state *old_exynos_state =
					to_exynos_plane_state(old_state);
	__drm_atomic_helper_plane_destroy_state(old_state);
	kfree(old_exynos_state);
}

static struct drm_plane_funcs exynos_plane_funcs = {
	.update_plane	= drm_atomic_helper_update_plane,
	.disable_plane	= drm_atomic_helper_disable_plane,
	.destroy	= drm_plane_cleanup,
	.reset		= exynos_drm_plane_reset,
	.atomic_duplicate_state = exynos_drm_plane_duplicate_state,
	.atomic_destroy_state = exynos_drm_plane_destroy_state,
};

static int
exynos_drm_plane_check_format(const struct exynos_drm_plane_config *config,
			      struct exynos_drm_plane_state *state)
{
	struct drm_framebuffer *fb = state->base.fb;

	switch (fb->modifier) {
	case DRM_FORMAT_MOD_SAMSUNG_64_32_TILE:
		if (!(config->capabilities & EXYNOS_DRM_PLANE_CAP_TILE))
			return -ENOTSUPP;
		break;

	case DRM_FORMAT_MOD_LINEAR:
		break;

	default:
		DRM_ERROR("unsupported pixel format modifier");
		return -ENOTSUPP;
	}

	return 0;
}

static int
exynos_drm_plane_check_size(const struct exynos_drm_plane_config *config,
			    struct exynos_drm_plane_state *state)
{
	bool width_ok = false, height_ok = false;

	if (config->capabilities & EXYNOS_DRM_PLANE_CAP_SCALE)
		return 0;

	if (state->src.w == state->crtc.w)
		width_ok = true;

	if (state->src.h == state->crtc.h)
		height_ok = true;

	if ((config->capabilities & EXYNOS_DRM_PLANE_CAP_DOUBLE) &&
	    state->h_ratio == (1 << 15))
		width_ok = true;

	if ((config->capabilities & EXYNOS_DRM_PLANE_CAP_DOUBLE) &&
	    state->v_ratio == (1 << 15))
		height_ok = true;

	if (width_ok && height_ok)
		return 0;

	DRM_DEBUG_KMS("scaling mode is not supported");
	return -ENOTSUPP;
}

static int exynos_plane_atomic_check(struct drm_plane *plane,
				     struct drm_plane_state *state)
{
	struct exynos_drm_plane *exynos_plane = to_exynos_plane(plane);
	struct exynos_drm_plane_state *exynos_state =
						to_exynos_plane_state(state);
	int ret = 0;

	if (!state->crtc || !state->fb)
		return 0;

	/* translate state into exynos_state */
	exynos_plane_mode_set(exynos_state);

	ret = exynos_drm_plane_check_format(exynos_plane->config, exynos_state);
	if (ret)
		return ret;

	ret = exynos_drm_plane_check_size(exynos_plane->config, exynos_state);
	return ret;
}

static void exynos_plane_atomic_update(struct drm_plane *plane,
				       struct drm_plane_state *old_state)
{
	struct drm_plane_state *state = plane->state;
	struct exynos_drm_crtc *exynos_crtc = to_exynos_crtc(state->crtc);
	struct exynos_drm_plane *exynos_plane = to_exynos_plane(plane);

	if (!state->crtc)
		return;

	plane->crtc = state->crtc;

	if (exynos_crtc->ops->update_plane)
		exynos_crtc->ops->update_plane(exynos_crtc, exynos_plane);
}

static void exynos_plane_atomic_disable(struct drm_plane *plane,
					struct drm_plane_state *old_state)
{
	struct exynos_drm_plane *exynos_plane = to_exynos_plane(plane);
	struct exynos_drm_crtc *exynos_crtc = to_exynos_crtc(old_state->crtc);

	if (!old_state->crtc)
		return;

	if (exynos_crtc->ops->disable_plane)
		exynos_crtc->ops->disable_plane(exynos_crtc, exynos_plane);
}

static const struct drm_plane_helper_funcs plane_helper_funcs = {
	.atomic_check = exynos_plane_atomic_check,
	.atomic_update = exynos_plane_atomic_update,
	.atomic_disable = exynos_plane_atomic_disable,
};

static void exynos_plane_attach_zpos_property(struct drm_plane *plane,
					      int zpos, bool immutable)
{
	if (immutable)
		drm_plane_create_zpos_immutable_property(plane, zpos);
	else
		drm_plane_create_zpos_property(plane, zpos, 0, MAX_PLANE - 1);
}

int exynos_plane_init(struct drm_device *dev,
		      struct exynos_drm_plane *exynos_plane, unsigned int index,
		      const struct exynos_drm_plane_config *config)
{
	int err;

	err = drm_universal_plane_init(dev, &exynos_plane->base,
				       1 << dev->mode_config.num_crtc,
				       &exynos_plane_funcs,
				       config->pixel_formats,
				       config->num_pixel_formats,
				       NULL, config->type, NULL);
	if (err) {
		DRM_ERROR("failed to initialize plane\n");
		return err;
	}

	drm_plane_helper_add(&exynos_plane->base, &plane_helper_funcs);

	exynos_plane->index = index;
	exynos_plane->config = config;

	exynos_plane_attach_zpos_property(&exynos_plane->base, config->zpos,
			   !(config->capabilities & EXYNOS_DRM_PLANE_CAP_ZPOS));

	return 0;
}