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		plane->state = &exynos_state->base;
143		plane->state->plane = plane;
144		plane->state->zpos = exynos_plane->config->zpos;
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	return &copy->base;
161}
162
163static void exynos_drm_plane_destroy_state(struct drm_plane *plane,
164					   struct drm_plane_state *old_state)
165{
166	struct exynos_drm_plane_state *old_exynos_state =
167					to_exynos_plane_state(old_state);
168	__drm_atomic_helper_plane_destroy_state(old_state);
169	kfree(old_exynos_state);
170}
171
172static struct drm_plane_funcs exynos_plane_funcs = {
173	.update_plane	= drm_atomic_helper_update_plane,
174	.disable_plane	= drm_atomic_helper_disable_plane,
175	.destroy	= drm_plane_cleanup,
176	.set_property	= drm_atomic_helper_plane_set_property,
177	.reset		= exynos_drm_plane_reset,
178	.atomic_duplicate_state = exynos_drm_plane_duplicate_state,
179	.atomic_destroy_state = exynos_drm_plane_destroy_state,
180};
181
182static int
183exynos_drm_plane_check_size(const struct exynos_drm_plane_config *config,
184			    struct exynos_drm_plane_state *state)
185{
186	bool width_ok = false, height_ok = false;
187
188	if (config->capabilities & EXYNOS_DRM_PLANE_CAP_SCALE)
189		return 0;
190
191	if (state->src.w == state->crtc.w)
192		width_ok = true;
193
194	if (state->src.h == state->crtc.h)
195		height_ok = true;
196
197	if ((config->capabilities & EXYNOS_DRM_PLANE_CAP_DOUBLE) &&
198	    state->h_ratio == (1 << 15))
199		width_ok = true;
200
201	if ((config->capabilities & EXYNOS_DRM_PLANE_CAP_DOUBLE) &&
202	    state->v_ratio == (1 << 15))
203		height_ok = true;
204
205	if (width_ok && height_ok)
206		return 0;
207
208	DRM_DEBUG_KMS("scaling mode is not supported");
209	return -ENOTSUPP;
210}
211
212static int exynos_plane_atomic_check(struct drm_plane *plane,
213				     struct drm_plane_state *state)
214{
215	struct exynos_drm_plane *exynos_plane = to_exynos_plane(plane);
216	struct exynos_drm_plane_state *exynos_state =
217						to_exynos_plane_state(state);
218	int ret = 0;
219
220	if (!state->crtc || !state->fb)
221		return 0;
222
223	/* translate state into exynos_state */
224	exynos_plane_mode_set(exynos_state);
225
226	ret = exynos_drm_plane_check_size(exynos_plane->config, exynos_state);
227	return ret;
228}
229
230static void exynos_plane_atomic_update(struct drm_plane *plane,
231				       struct drm_plane_state *old_state)
232{
233	struct drm_plane_state *state = plane->state;
234	struct exynos_drm_crtc *exynos_crtc = to_exynos_crtc(state->crtc);
235	struct exynos_drm_plane *exynos_plane = to_exynos_plane(plane);
236
237	if (!state->crtc)
238		return;
239
240	plane->crtc = state->crtc;
241
242	if (exynos_crtc->ops->update_plane)
243		exynos_crtc->ops->update_plane(exynos_crtc, exynos_plane);
244}
245
246static void exynos_plane_atomic_disable(struct drm_plane *plane,
247					struct drm_plane_state *old_state)
248{
249	struct exynos_drm_plane *exynos_plane = to_exynos_plane(plane);
250	struct exynos_drm_crtc *exynos_crtc = to_exynos_crtc(old_state->crtc);
251
252	if (!old_state->crtc)
253		return;
254
255	if (exynos_crtc->ops->disable_plane)
256		exynos_crtc->ops->disable_plane(exynos_crtc, exynos_plane);
257}
258
259static const struct drm_plane_helper_funcs plane_helper_funcs = {
260	.atomic_check = exynos_plane_atomic_check,
261	.atomic_update = exynos_plane_atomic_update,
262	.atomic_disable = exynos_plane_atomic_disable,
263};
264
265static void exynos_plane_attach_zpos_property(struct drm_plane *plane,
266					      bool immutable)
267{
268	/* FIXME */
269	if (immutable)
270		drm_plane_create_zpos_immutable_property(plane, 0);
271	else
272		drm_plane_create_zpos_property(plane, 0, 0, MAX_PLANE - 1);
273}
274
275int exynos_plane_init(struct drm_device *dev,
276		      struct exynos_drm_plane *exynos_plane,
277		      unsigned int index, unsigned long possible_crtcs,
278		      const struct exynos_drm_plane_config *config)
279{
280	int err;
281
282	err = drm_universal_plane_init(dev, &exynos_plane->base,
283				       possible_crtcs,
284				       &exynos_plane_funcs,
285				       config->pixel_formats,
286				       config->num_pixel_formats,
287				       config->type, NULL);
288	if (err) {
289		DRM_ERROR("failed to initialize plane\n");
290		return err;
291	}
292
293	drm_plane_helper_add(&exynos_plane->base, &plane_helper_funcs);
294
295	exynos_plane->index = index;
296	exynos_plane->config = config;
297
298	exynos_plane_attach_zpos_property(&exynos_plane->base,
299			   !(config->capabilities & EXYNOS_DRM_PLANE_CAP_ZPOS));
300
301	return 0;
302}