komeda_kms.c

  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
 23DEFINE_DRM_GEM_DMA_FOPS(komeda_cma_fops);
 24
 25static 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
 37static 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
 59static 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
 70static 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
 89static 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
110static const struct drm_mode_config_helper_funcs komeda_mode_config_helpers = {
111	.atomic_commit_tail = komeda_kms_commit_tail,
112};
113
114static 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
153static 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
218static 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
250static 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
256static 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
275struct 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
328free_interrupts:
329	drm_kms_helper_poll_fini(drm);
330cleanup_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
337void 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
349void komeda_kms_shutdown(struct komeda_kms_dev *kms)
350{
351	struct drm_device *drm = &kms->base;
352
353	drm_atomic_helper_shutdown(drm);
354}