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