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 */
 45static 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
 60static 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
127static 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		if (exynos_state->base.fb)
135			drm_framebuffer_unreference(exynos_state->base.fb);
136		kfree(exynos_state);
137		plane->state = NULL;
138	}
139
140	exynos_state = kzalloc(sizeof(*exynos_state), GFP_KERNEL);
141	if (exynos_state) {
142		exynos_state->zpos = exynos_plane->config->zpos;
143		plane->state = &exynos_state->base;
144		plane->state->plane = plane;
145	}
146}
147
148static struct drm_plane_state *
149exynos_drm_plane_duplicate_state(struct drm_plane *plane)
150{
151	struct exynos_drm_plane_state *exynos_state;
152	struct exynos_drm_plane_state *copy;
153
154	exynos_state = to_exynos_plane_state(plane->state);
155	copy = kzalloc(sizeof(*exynos_state), GFP_KERNEL);
156	if (!copy)
157		return NULL;
158
159	__drm_atomic_helper_plane_duplicate_state(plane, &copy->base);
160	copy->zpos = exynos_state->zpos;
161	return &copy->base;
162}
163
164static void exynos_drm_plane_destroy_state(struct drm_plane *plane,
165					   struct drm_plane_state *old_state)
166{
167	struct exynos_drm_plane_state *old_exynos_state =
168					to_exynos_plane_state(old_state);
169	__drm_atomic_helper_plane_destroy_state(plane, old_state);
170	kfree(old_exynos_state);
171}
172
173static int exynos_drm_plane_atomic_set_property(struct drm_plane *plane,
174						struct drm_plane_state *state,
175						struct drm_property *property,
176						uint64_t val)
177{
178	struct exynos_drm_plane *exynos_plane = to_exynos_plane(plane);
179	struct exynos_drm_plane_state *exynos_state =
180					to_exynos_plane_state(state);
181	struct exynos_drm_private *dev_priv = plane->dev->dev_private;
182	const struct exynos_drm_plane_config *config = exynos_plane->config;
183
184	if (property == dev_priv->plane_zpos_property &&
185	    (config->capabilities & EXYNOS_DRM_PLANE_CAP_ZPOS))
186		exynos_state->zpos = val;
187	else
188		return -EINVAL;
189
190	return 0;
191}
192
193static int exynos_drm_plane_atomic_get_property(struct drm_plane *plane,
194					  const struct drm_plane_state *state,
195					  struct drm_property *property,
196					  uint64_t *val)
197{
198	const struct exynos_drm_plane_state *exynos_state =
199		container_of(state, const struct exynos_drm_plane_state, base);
200	struct exynos_drm_private *dev_priv = plane->dev->dev_private;
201
202	if (property == dev_priv->plane_zpos_property)
203		*val = exynos_state->zpos;
204	else
205		return -EINVAL;
206
207	return 0;
208}
209
210static struct drm_plane_funcs exynos_plane_funcs = {
211	.update_plane	= drm_atomic_helper_update_plane,
212	.disable_plane	= drm_atomic_helper_disable_plane,
213	.destroy	= drm_plane_cleanup,
214	.set_property	= drm_atomic_helper_plane_set_property,
215	.reset		= exynos_drm_plane_reset,
216	.atomic_duplicate_state = exynos_drm_plane_duplicate_state,
217	.atomic_destroy_state = exynos_drm_plane_destroy_state,
218	.atomic_set_property = exynos_drm_plane_atomic_set_property,
219	.atomic_get_property = exynos_drm_plane_atomic_get_property,
220};
221
222static int
223exynos_drm_plane_check_size(const struct exynos_drm_plane_config *config,
224			    struct exynos_drm_plane_state *state)
225{
226	bool width_ok = false, height_ok = false;
227
228	if (config->capabilities & EXYNOS_DRM_PLANE_CAP_SCALE)
229		return 0;
230
231	if (state->src.w == state->crtc.w)
232		width_ok = true;
233
234	if (state->src.h == state->crtc.h)
235		height_ok = true;
236
237	if ((config->capabilities & EXYNOS_DRM_PLANE_CAP_DOUBLE) &&
238	    state->h_ratio == (1 << 15))
239		width_ok = true;
240
241	if ((config->capabilities & EXYNOS_DRM_PLANE_CAP_DOUBLE) &&
242	    state->v_ratio == (1 << 15))
243		height_ok = true;
244
245	if (width_ok & height_ok)
246		return 0;
247
248	DRM_DEBUG_KMS("scaling mode is not supported");
249	return -ENOTSUPP;
250}
251
252static int exynos_plane_atomic_check(struct drm_plane *plane,
253				     struct drm_plane_state *state)
254{
255	struct exynos_drm_plane *exynos_plane = to_exynos_plane(plane);
256	struct exynos_drm_plane_state *exynos_state =
257						to_exynos_plane_state(state);
258	int ret = 0;
259
260	if (!state->crtc || !state->fb)
261		return 0;
262
263	/* translate state into exynos_state */
264	exynos_plane_mode_set(exynos_state);
265
266	ret = exynos_drm_plane_check_size(exynos_plane->config, exynos_state);
267	return ret;
268}
269
270static void exynos_plane_atomic_update(struct drm_plane *plane,
271				       struct drm_plane_state *old_state)
272{
273	struct drm_plane_state *state = plane->state;
274	struct exynos_drm_crtc *exynos_crtc = to_exynos_crtc(state->crtc);
275	struct exynos_drm_plane *exynos_plane = to_exynos_plane(plane);
276
277	if (!state->crtc)
278		return;
279
280	plane->crtc = state->crtc;
281	exynos_plane->pending_fb = state->fb;
282
283	if (exynos_crtc->ops->update_plane)
284		exynos_crtc->ops->update_plane(exynos_crtc, exynos_plane);
285}
286
287static void exynos_plane_atomic_disable(struct drm_plane *plane,
288					struct drm_plane_state *old_state)
289{
290	struct exynos_drm_plane *exynos_plane = to_exynos_plane(plane);
291	struct exynos_drm_crtc *exynos_crtc = to_exynos_crtc(old_state->crtc);
292
293	if (!old_state->crtc)
294		return;
295
296	if (exynos_crtc->ops->disable_plane)
297		exynos_crtc->ops->disable_plane(exynos_crtc, exynos_plane);
298}
299
300static const struct drm_plane_helper_funcs plane_helper_funcs = {
301	.atomic_check = exynos_plane_atomic_check,
302	.atomic_update = exynos_plane_atomic_update,
303	.atomic_disable = exynos_plane_atomic_disable,
304};
305
306static void exynos_plane_attach_zpos_property(struct drm_plane *plane,
307					      unsigned int zpos)
308{
309	struct drm_device *dev = plane->dev;
310	struct exynos_drm_private *dev_priv = dev->dev_private;
311	struct drm_property *prop;
312
313	prop = dev_priv->plane_zpos_property;
314	if (!prop) {
315		prop = drm_property_create_range(dev, 0, "zpos",
316						 0, MAX_PLANE - 1);
317		if (!prop)
318			return;
319
320		dev_priv->plane_zpos_property = prop;
321	}
322
323	drm_object_attach_property(&plane->base, prop, zpos);
324}
325
326int exynos_plane_init(struct drm_device *dev,
327		      struct exynos_drm_plane *exynos_plane,
328		      unsigned int index, unsigned long possible_crtcs,
329		      const struct exynos_drm_plane_config *config)
330{
331	int err;
332
333	err = drm_universal_plane_init(dev, &exynos_plane->base,
334				       possible_crtcs,
335				       &exynos_plane_funcs,
336				       config->pixel_formats,
337				       config->num_pixel_formats,
338				       config->type, NULL);
339	if (err) {
340		DRM_ERROR("failed to initialize plane\n");
341		return err;
342	}
343
344	drm_plane_helper_add(&exynos_plane->base, &plane_helper_funcs);
345
346	exynos_plane->index = index;
347	exynos_plane->config = config;
348
349	exynos_plane_attach_zpos_property(&exynos_plane->base, config->zpos);
350
351	return 0;
352}