1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * (C) COPYRIGHT 2018 ARM Limited. All rights reserved.
4 * Author: James.Qian.Wang <james.qian.wang@arm.com>
5 *
6 */
7 #include <linux/component.h>
8 #include <linux/interrupt.h>
9
10 #include <drm/drm_atomic.h>
11 #include <drm/drm_atomic_helper.h>
12 #include <drm/drm_drv.h>
13 #include <drm/drm_fb_helper.h>
14 #include <drm/drm_gem_cma_helper.h>
15 #include <drm/drm_gem_framebuffer_helper.h>
16 #include <drm/drm_irq.h>
17 #include <drm/drm_managed.h>
18 #include <drm/drm_probe_helper.h>
19 #include <drm/drm_vblank.h>
20
21 #include "komeda_dev.h"
22 #include "komeda_framebuffer.h"
23 #include "komeda_kms.h"
24
25 DEFINE_DRM_GEM_CMA_FOPS(komeda_cma_fops);
26
komeda_gem_cma_dumb_create(struct drm_file * file,struct drm_device * dev,struct drm_mode_create_dumb * args)27 static int komeda_gem_cma_dumb_create(struct drm_file *file,
28 struct drm_device *dev,
29 struct drm_mode_create_dumb *args)
30 {
31 struct komeda_dev *mdev = dev->dev_private;
32 u32 pitch = DIV_ROUND_UP(args->width * args->bpp, 8);
33
34 args->pitch = ALIGN(pitch, mdev->chip.bus_width);
35
36 return drm_gem_cma_dumb_create_internal(file, dev, args);
37 }
38
komeda_kms_irq_handler(int irq,void * data)39 static irqreturn_t komeda_kms_irq_handler(int irq, void *data)
40 {
41 struct drm_device *drm = data;
42 struct komeda_dev *mdev = drm->dev_private;
43 struct komeda_kms_dev *kms = to_kdev(drm);
44 struct komeda_events evts;
45 irqreturn_t status;
46 u32 i;
47
48 /* Call into the CHIP to recognize events */
49 memset(&evts, 0, sizeof(evts));
50 status = mdev->funcs->irq_handler(mdev, &evts);
51
52 komeda_print_events(&evts, drm);
53
54 /* Notify the crtc to handle the events */
55 for (i = 0; i < kms->n_crtcs; i++)
56 komeda_crtc_handle_event(&kms->crtcs[i], &evts);
57
58 return status;
59 }
60
61 static struct drm_driver komeda_kms_driver = {
62 .driver_features = DRIVER_GEM | DRIVER_MODESET | DRIVER_ATOMIC,
63 .lastclose = drm_fb_helper_lastclose,
64 DRM_GEM_CMA_DRIVER_OPS_WITH_DUMB_CREATE(komeda_gem_cma_dumb_create),
65 .fops = &komeda_cma_fops,
66 .name = "komeda",
67 .desc = "Arm Komeda Display Processor driver",
68 .date = "20181101",
69 .major = 0,
70 .minor = 1,
71 };
72
komeda_kms_commit_tail(struct drm_atomic_state * old_state)73 static void komeda_kms_commit_tail(struct drm_atomic_state *old_state)
74 {
75 struct drm_device *dev = old_state->dev;
76
77 drm_atomic_helper_commit_modeset_disables(dev, old_state);
78
79 drm_atomic_helper_commit_planes(dev, old_state,
80 DRM_PLANE_COMMIT_ACTIVE_ONLY);
81
82 drm_atomic_helper_commit_modeset_enables(dev, old_state);
83
84 drm_atomic_helper_wait_for_flip_done(dev, old_state);
85
86 drm_atomic_helper_commit_hw_done(old_state);
87
88 drm_atomic_helper_cleanup_planes(dev, old_state);
89 }
90
91 static const struct drm_mode_config_helper_funcs komeda_mode_config_helpers = {
92 .atomic_commit_tail = komeda_kms_commit_tail,
93 };
94
komeda_plane_state_list_add(struct drm_plane_state * plane_st,struct list_head * zorder_list)95 static int komeda_plane_state_list_add(struct drm_plane_state *plane_st,
96 struct list_head *zorder_list)
97 {
98 struct komeda_plane_state *new = to_kplane_st(plane_st);
99 struct komeda_plane_state *node, *last;
100
101 last = list_empty(zorder_list) ?
102 NULL : list_last_entry(zorder_list, typeof(*last), zlist_node);
103
104 /* Considering the list sequence is zpos increasing, so if list is empty
105 * or the zpos of new node bigger than the last node in list, no need
106 * loop and just insert the new one to the tail of the list.
107 */
108 if (!last || (new->base.zpos > last->base.zpos)) {
109 list_add_tail(&new->zlist_node, zorder_list);
110 return 0;
111 }
112
113 /* Build the list by zpos increasing */
114 list_for_each_entry(node, zorder_list, zlist_node) {
115 if (new->base.zpos < node->base.zpos) {
116 list_add_tail(&new->zlist_node, &node->zlist_node);
117 break;
118 } else if (node->base.zpos == new->base.zpos) {
119 struct drm_plane *a = node->base.plane;
120 struct drm_plane *b = new->base.plane;
121
122 /* Komeda doesn't support setting a same zpos for
123 * different planes.
124 */
125 DRM_DEBUG_ATOMIC("PLANE: %s and PLANE: %s are configured same zpos: %d.\n",
126 a->name, b->name, node->base.zpos);
127 return -EINVAL;
128 }
129 }
130
131 return 0;
132 }
133
komeda_crtc_normalize_zpos(struct drm_crtc * crtc,struct drm_crtc_state * crtc_st)134 static int komeda_crtc_normalize_zpos(struct drm_crtc *crtc,
135 struct drm_crtc_state *crtc_st)
136 {
137 struct drm_atomic_state *state = crtc_st->state;
138 struct komeda_crtc *kcrtc = to_kcrtc(crtc);
139 struct komeda_crtc_state *kcrtc_st = to_kcrtc_st(crtc_st);
140 struct komeda_plane_state *kplane_st;
141 struct drm_plane_state *plane_st;
142 struct drm_plane *plane;
143 struct list_head zorder_list;
144 int order = 0, err;
145
146 DRM_DEBUG_ATOMIC("[CRTC:%d:%s] calculating normalized zpos values\n",
147 crtc->base.id, crtc->name);
148
149 INIT_LIST_HEAD(&zorder_list);
150
151 /* This loop also added all effected planes into the new state */
152 drm_for_each_plane_mask(plane, crtc->dev, crtc_st->plane_mask) {
153 plane_st = drm_atomic_get_plane_state(state, plane);
154 if (IS_ERR(plane_st))
155 return PTR_ERR(plane_st);
156
157 /* Build a list by zpos increasing */
158 err = komeda_plane_state_list_add(plane_st, &zorder_list);
159 if (err)
160 return err;
161 }
162
163 kcrtc_st->max_slave_zorder = 0;
164
165 list_for_each_entry(kplane_st, &zorder_list, zlist_node) {
166 plane_st = &kplane_st->base;
167 plane = plane_st->plane;
168
169 plane_st->normalized_zpos = order++;
170 /* When layer_split has been enabled, one plane will be handled
171 * by two separated komeda layers (left/right), which may needs
172 * two zorders.
173 * - zorder: for left_layer for left display part.
174 * - zorder + 1: will be reserved for right layer.
175 */
176 if (to_kplane_st(plane_st)->layer_split)
177 order++;
178
179 DRM_DEBUG_ATOMIC("[PLANE:%d:%s] zpos:%d, normalized zpos: %d\n",
180 plane->base.id, plane->name,
181 plane_st->zpos, plane_st->normalized_zpos);
182
183 /* calculate max slave zorder */
184 if (has_bit(drm_plane_index(plane), kcrtc->slave_planes))
185 kcrtc_st->max_slave_zorder =
186 max(plane_st->normalized_zpos,
187 kcrtc_st->max_slave_zorder);
188 }
189
190 crtc_st->zpos_changed = true;
191
192 return 0;
193 }
194
komeda_kms_check(struct drm_device * dev,struct drm_atomic_state * state)195 static int komeda_kms_check(struct drm_device *dev,
196 struct drm_atomic_state *state)
197 {
198 struct drm_crtc *crtc;
199 struct drm_crtc_state *new_crtc_st;
200 int i, err;
201
202 err = drm_atomic_helper_check_modeset(dev, state);
203 if (err)
204 return err;
205
206 /* Komeda need to re-calculate resource assumption in every commit
207 * so need to add all affected_planes (even unchanged) to
208 * drm_atomic_state.
209 */
210 for_each_new_crtc_in_state(state, crtc, new_crtc_st, i) {
211 err = drm_atomic_add_affected_planes(state, crtc);
212 if (err)
213 return err;
214
215 err = komeda_crtc_normalize_zpos(crtc, new_crtc_st);
216 if (err)
217 return err;
218 }
219
220 err = drm_atomic_helper_check_planes(dev, state);
221 if (err)
222 return err;
223
224 return 0;
225 }
226
227 static const struct drm_mode_config_funcs komeda_mode_config_funcs = {
228 .fb_create = komeda_fb_create,
229 .atomic_check = komeda_kms_check,
230 .atomic_commit = drm_atomic_helper_commit,
231 };
232
komeda_kms_mode_config_init(struct komeda_kms_dev * kms,struct komeda_dev * mdev)233 static void komeda_kms_mode_config_init(struct komeda_kms_dev *kms,
234 struct komeda_dev *mdev)
235 {
236 struct drm_mode_config *config = &kms->base.mode_config;
237
238 drm_mode_config_init(&kms->base);
239
240 komeda_kms_setup_crtcs(kms, mdev);
241
242 /* Get value from dev */
243 config->min_width = 0;
244 config->min_height = 0;
245 config->max_width = 4096;
246 config->max_height = 4096;
247 config->allow_fb_modifiers = true;
248
249 config->funcs = &komeda_mode_config_funcs;
250 config->helper_private = &komeda_mode_config_helpers;
251 }
252
komeda_kms_attach(struct komeda_dev * mdev)253 struct komeda_kms_dev *komeda_kms_attach(struct komeda_dev *mdev)
254 {
255 struct komeda_kms_dev *kms;
256 struct drm_device *drm;
257 int err;
258
259 kms = devm_drm_dev_alloc(mdev->dev, &komeda_kms_driver,
260 struct komeda_kms_dev, base);
261 if (IS_ERR(kms))
262 return kms;
263
264 drm = &kms->base;
265
266 drm->dev_private = mdev;
267
268 komeda_kms_mode_config_init(kms, mdev);
269
270 err = komeda_kms_add_private_objs(kms, mdev);
271 if (err)
272 goto cleanup_mode_config;
273
274 err = komeda_kms_add_planes(kms, mdev);
275 if (err)
276 goto cleanup_mode_config;
277
278 err = drm_vblank_init(drm, kms->n_crtcs);
279 if (err)
280 goto cleanup_mode_config;
281
282 err = komeda_kms_add_crtcs(kms, mdev);
283 if (err)
284 goto cleanup_mode_config;
285
286 err = komeda_kms_add_wb_connectors(kms, mdev);
287 if (err)
288 goto cleanup_mode_config;
289
290 err = component_bind_all(mdev->dev, kms);
291 if (err)
292 goto cleanup_mode_config;
293
294 drm_mode_config_reset(drm);
295
296 err = devm_request_irq(drm->dev, mdev->irq,
297 komeda_kms_irq_handler, IRQF_SHARED,
298 drm->driver->name, drm);
299 if (err)
300 goto free_component_binding;
301
302 drm->irq_enabled = true;
303
304 drm_kms_helper_poll_init(drm);
305
306 err = drm_dev_register(drm, 0);
307 if (err)
308 goto free_interrupts;
309
310 return kms;
311
312 free_interrupts:
313 drm_kms_helper_poll_fini(drm);
314 drm->irq_enabled = false;
315 free_component_binding:
316 component_unbind_all(mdev->dev, drm);
317 cleanup_mode_config:
318 drm_mode_config_cleanup(drm);
319 komeda_kms_cleanup_private_objs(kms);
320 drm->dev_private = NULL;
321 return ERR_PTR(err);
322 }
323
komeda_kms_detach(struct komeda_kms_dev * kms)324 void komeda_kms_detach(struct komeda_kms_dev *kms)
325 {
326 struct drm_device *drm = &kms->base;
327 struct komeda_dev *mdev = drm->dev_private;
328
329 drm_dev_unregister(drm);
330 drm_kms_helper_poll_fini(drm);
331 drm_atomic_helper_shutdown(drm);
332 drm->irq_enabled = false;
333 component_unbind_all(mdev->dev, drm);
334 drm_mode_config_cleanup(drm);
335 komeda_kms_cleanup_private_objs(kms);
336 drm->dev_private = NULL;
337 }
338
