exynos_drm_plane.c

  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_print.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 */
 42static 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
 57static 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_new_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
125static 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
144static struct drm_plane_state *
145exynos_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
159static 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
168static 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
177static int
178exynos_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
201static int
202exynos_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
232static 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
256static 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
271static 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
285static 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
291static 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
300int 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}