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/interrupt.h>
8
9 #include <drm/drm_atomic.h>
10 #include <drm/drm_atomic_helper.h>
11 #include <drm/drm_drv.h>
12 #include <drm/drm_fbdev_dma.h>
13 #include <drm/drm_gem_dma_helper.h>
14 #include <drm/drm_gem_framebuffer_helper.h>
15 #include <drm/drm_managed.h>
16 #include <drm/drm_probe_helper.h>
17 #include <drm/drm_vblank.h>
18
19 #include "komeda_dev.h"
20 #include "komeda_framebuffer.h"
21 #include "komeda_kms.h"
22
23 DEFINE_DRM_GEM_DMA_FOPS(komeda_cma_fops);
24
komeda_gem_dma_dumb_create(struct drm_file * file,struct drm_device * dev,struct drm_mode_create_dumb * args)25 static int komeda_gem_dma_dumb_create(struct drm_file *file,
26 struct drm_device *dev,
27 struct drm_mode_create_dumb *args)
28 {
29 struct komeda_dev *mdev = dev->dev_private;
30 u32 pitch = DIV_ROUND_UP(args->width * args->bpp, 8);
31
32 args->pitch = ALIGN(pitch, mdev->chip.bus_width);
33
34 return drm_gem_dma_dumb_create_internal(file, dev, args);
35 }
36
komeda_kms_irq_handler(int irq,void * data)37 static irqreturn_t komeda_kms_irq_handler(int irq, void *data)
38 {
39 struct drm_device *drm = data;
40 struct komeda_dev *mdev = drm->dev_private;
41 struct komeda_kms_dev *kms = to_kdev(drm);
42 struct komeda_events evts;
43 irqreturn_t status;
44 u32 i;
45
46 /* Call into the CHIP to recognize events */
47 memset(&evts, 0, sizeof(evts));
48 status = mdev->funcs->irq_handler(mdev, &evts);
49
50 komeda_print_events(&evts, drm);
51
52 /* Notify the crtc to handle the events */
53 for (i = 0; i < kms->n_crtcs; i++)
54 komeda_crtc_handle_event(&kms->crtcs[i], &evts);
55
56 return status;
57 }
58
59 static const struct drm_driver komeda_kms_driver = {
60 .driver_features = DRIVER_GEM | DRIVER_MODESET | DRIVER_ATOMIC,
61 DRM_GEM_DMA_DRIVER_OPS_WITH_DUMB_CREATE(komeda_gem_dma_dumb_create),
62 DRM_FBDEV_DMA_DRIVER_OPS,
63 .fops = &komeda_cma_fops,
64 .name = "komeda",
65 .desc = "Arm Komeda Display Processor driver",
66 .major = 0,
67 .minor = 1,
68 };
69
komeda_kms_atomic_commit_hw_done(struct drm_atomic_state * state)70 static void komeda_kms_atomic_commit_hw_done(struct drm_atomic_state *state)
71 {
72 struct drm_device *dev = state->dev;
73 struct komeda_kms_dev *kms = to_kdev(dev);
74 int i;
75
76 for (i = 0; i < kms->n_crtcs; i++) {
77 struct komeda_crtc *kcrtc = &kms->crtcs[i];
78
79 if (kcrtc->base.state->active) {
80 struct completion *flip_done = NULL;
81 if (kcrtc->base.state->event)
82 flip_done = kcrtc->base.state->event->base.completion;
83 komeda_crtc_flush_and_wait_for_flip_done(kcrtc, flip_done);
84 }
85 }
86 drm_atomic_helper_commit_hw_done(state);
87 }
88
komeda_kms_commit_tail(struct drm_atomic_state * old_state)89 static void komeda_kms_commit_tail(struct drm_atomic_state *old_state)
90 {
91 struct drm_device *dev = old_state->dev;
92 bool fence_cookie = dma_fence_begin_signalling();
93
94 drm_atomic_helper_commit_modeset_disables(dev, old_state);
95
96 drm_atomic_helper_commit_planes(dev, old_state,
97 DRM_PLANE_COMMIT_ACTIVE_ONLY);
98
99 drm_atomic_helper_commit_modeset_enables(dev, old_state);
100
101 komeda_kms_atomic_commit_hw_done(old_state);
102
103 drm_atomic_helper_wait_for_flip_done(dev, old_state);
104
105 dma_fence_end_signalling(fence_cookie);
106
107 drm_atomic_helper_cleanup_planes(dev, old_state);
108 }
109
110 static const struct drm_mode_config_helper_funcs komeda_mode_config_helpers = {
111 .atomic_commit_tail = komeda_kms_commit_tail,
112 };
113
komeda_plane_state_list_add(struct drm_plane_state * plane_st,struct list_head * zorder_list)114 static int komeda_plane_state_list_add(struct drm_plane_state *plane_st,
115 struct list_head *zorder_list)
116 {
117 struct komeda_plane_state *new = to_kplane_st(plane_st);
118 struct komeda_plane_state *node, *last;
119
120 last = list_empty(zorder_list) ?
121 NULL : list_last_entry(zorder_list, typeof(*last), zlist_node);
122
123 /* Considering the list sequence is zpos increasing, so if list is empty
124 * or the zpos of new node bigger than the last node in list, no need
125 * loop and just insert the new one to the tail of the list.
126 */
127 if (!last || (new->base.zpos > last->base.zpos)) {
128 list_add_tail(&new->zlist_node, zorder_list);
129 return 0;
130 }
131
132 /* Build the list by zpos increasing */
133 list_for_each_entry(node, zorder_list, zlist_node) {
134 if (new->base.zpos < node->base.zpos) {
135 list_add_tail(&new->zlist_node, &node->zlist_node);
136 break;
137 } else if (node->base.zpos == new->base.zpos) {
138 struct drm_plane *a = node->base.plane;
139 struct drm_plane *b = new->base.plane;
140
141 /* Komeda doesn't support setting a same zpos for
142 * different planes.
143 */
144 DRM_DEBUG_ATOMIC("PLANE: %s and PLANE: %s are configured same zpos: %d.\n",
145 a->name, b->name, node->base.zpos);
146 return -EINVAL;
147 }
148 }
149
150 return 0;
151 }
152
komeda_crtc_normalize_zpos(struct drm_crtc * crtc,struct drm_crtc_state * crtc_st)153 static int komeda_crtc_normalize_zpos(struct drm_crtc *crtc,
154 struct drm_crtc_state *crtc_st)
155 {
156 struct drm_atomic_state *state = crtc_st->state;
157 struct komeda_crtc *kcrtc = to_kcrtc(crtc);
158 struct komeda_crtc_state *kcrtc_st = to_kcrtc_st(crtc_st);
159 struct komeda_plane_state *kplane_st;
160 struct drm_plane_state *plane_st;
161 struct drm_plane *plane;
162 struct list_head zorder_list;
163 int order = 0, err;
164 u32 slave_zpos = 0;
165
166 DRM_DEBUG_ATOMIC("[CRTC:%d:%s] calculating normalized zpos values\n",
167 crtc->base.id, crtc->name);
168
169 INIT_LIST_HEAD(&zorder_list);
170
171 /* This loop also added all effected planes into the new state */
172 drm_for_each_plane_mask(plane, crtc->dev, crtc_st->plane_mask) {
173 plane_st = drm_atomic_get_plane_state(state, plane);
174 if (IS_ERR(plane_st))
175 return PTR_ERR(plane_st);
176
177 /* Build a list by zpos increasing */
178 err = komeda_plane_state_list_add(plane_st, &zorder_list);
179 if (err)
180 return err;
181 }
182
183 kcrtc_st->max_slave_zorder = 0;
184
185 list_for_each_entry(kplane_st, &zorder_list, zlist_node) {
186 plane_st = &kplane_st->base;
187 plane = plane_st->plane;
188
189 plane_st->normalized_zpos = order++;
190 /* When layer_split has been enabled, one plane will be handled
191 * by two separated komeda layers (left/right), which may needs
192 * two zorders.
193 * - zorder: for left_layer for left display part.
194 * - zorder + 1: will be reserved for right layer.
195 */
196 if (to_kplane_st(plane_st)->layer_split)
197 order++;
198
199 DRM_DEBUG_ATOMIC("[PLANE:%d:%s] zpos:%d, normalized zpos: %d\n",
200 plane->base.id, plane->name,
201 plane_st->zpos, plane_st->normalized_zpos);
202
203 /* calculate max slave zorder */
204 if (has_bit(drm_plane_index(plane), kcrtc->slave_planes)) {
205 slave_zpos = plane_st->normalized_zpos;
206 if (to_kplane_st(plane_st)->layer_split)
207 slave_zpos++;
208 kcrtc_st->max_slave_zorder =
209 max(slave_zpos, kcrtc_st->max_slave_zorder);
210 }
211 }
212
213 crtc_st->zpos_changed = true;
214
215 return 0;
216 }
217
komeda_kms_check(struct drm_device * dev,struct drm_atomic_state * state)218 static int komeda_kms_check(struct drm_device *dev,
219 struct drm_atomic_state *state)
220 {
221 struct drm_crtc *crtc;
222 struct drm_crtc_state *new_crtc_st;
223 int i, err;
224
225 err = drm_atomic_helper_check_modeset(dev, state);
226 if (err)
227 return err;
228
229 /* Komeda need to re-calculate resource assumption in every commit
230 * so need to add all affected_planes (even unchanged) to
231 * drm_atomic_state.
232 */
233 for_each_new_crtc_in_state(state, crtc, new_crtc_st, i) {
234 err = drm_atomic_add_affected_planes(state, crtc);
235 if (err)
236 return err;
237
238 err = komeda_crtc_normalize_zpos(crtc, new_crtc_st);
239 if (err)
240 return err;
241 }
242
243 err = drm_atomic_helper_check_planes(dev, state);
244 if (err)
245 return err;
246
247 return 0;
248 }
249
250 static const struct drm_mode_config_funcs komeda_mode_config_funcs = {
251 .fb_create = komeda_fb_create,
252 .atomic_check = komeda_kms_check,
253 .atomic_commit = drm_atomic_helper_commit,
254 };
255
komeda_kms_mode_config_init(struct komeda_kms_dev * kms,struct komeda_dev * mdev)256 static void komeda_kms_mode_config_init(struct komeda_kms_dev *kms,
257 struct komeda_dev *mdev)
258 {
259 struct drm_mode_config *config = &kms->base.mode_config;
260
261 drm_mode_config_init(&kms->base);
262
263 komeda_kms_setup_crtcs(kms, mdev);
264
265 /* Get value from dev */
266 config->min_width = 0;
267 config->min_height = 0;
268 config->max_width = 4096;
269 config->max_height = 4096;
270
271 config->funcs = &komeda_mode_config_funcs;
272 config->helper_private = &komeda_mode_config_helpers;
273 }
274
komeda_kms_attach(struct komeda_dev * mdev)275 struct komeda_kms_dev *komeda_kms_attach(struct komeda_dev *mdev)
276 {
277 struct komeda_kms_dev *kms;
278 struct drm_device *drm;
279 int err;
280
281 kms = devm_drm_dev_alloc(mdev->dev, &komeda_kms_driver,
282 struct komeda_kms_dev, base);
283 if (IS_ERR(kms))
284 return kms;
285
286 drm = &kms->base;
287
288 drm->dev_private = mdev;
289
290 komeda_kms_mode_config_init(kms, mdev);
291
292 err = komeda_kms_add_private_objs(kms, mdev);
293 if (err)
294 goto cleanup_mode_config;
295
296 err = komeda_kms_add_planes(kms, mdev);
297 if (err)
298 goto cleanup_mode_config;
299
300 err = drm_vblank_init(drm, kms->n_crtcs);
301 if (err)
302 goto cleanup_mode_config;
303
304 err = komeda_kms_add_crtcs(kms, mdev);
305 if (err)
306 goto cleanup_mode_config;
307
308 err = komeda_kms_add_wb_connectors(kms, mdev);
309 if (err)
310 goto cleanup_mode_config;
311
312 drm_mode_config_reset(drm);
313
314 err = devm_request_irq(drm->dev, mdev->irq,
315 komeda_kms_irq_handler, IRQF_SHARED,
316 drm->driver->name, drm);
317 if (err)
318 goto cleanup_mode_config;
319
320 drm_kms_helper_poll_init(drm);
321
322 err = drm_dev_register(drm, 0);
323 if (err)
324 goto free_interrupts;
325
326 return kms;
327
328 free_interrupts:
329 drm_kms_helper_poll_fini(drm);
330 cleanup_mode_config:
331 drm_mode_config_cleanup(drm);
332 komeda_kms_cleanup_private_objs(kms);
333 drm->dev_private = NULL;
334 return ERR_PTR(err);
335 }
336
komeda_kms_detach(struct komeda_kms_dev * kms)337 void komeda_kms_detach(struct komeda_kms_dev *kms)
338 {
339 struct drm_device *drm = &kms->base;
340
341 drm_dev_unregister(drm);
342 drm_kms_helper_poll_fini(drm);
343 drm_atomic_helper_shutdown(drm);
344 drm_mode_config_cleanup(drm);
345 komeda_kms_cleanup_private_objs(kms);
346 drm->dev_private = NULL;
347 }
348
komeda_kms_shutdown(struct komeda_kms_dev * kms)349 void komeda_kms_shutdown(struct komeda_kms_dev *kms)
350 {
351 struct drm_device *drm = &kms->base;
352
353 drm_atomic_helper_shutdown(drm);
354 }
355