1 /*
2 * Freescale i.MX drm driver
3 *
4 * Copyright (C) 2011 Sascha Hauer, Pengutronix
5 *
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public License
8 * as published by the Free Software Foundation; either version 2
9 * of the License, or (at your option) any later version.
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
14 *
15 */
16 #include <linux/component.h>
17 #include <linux/device.h>
18 #include <linux/dma-buf.h>
19 #include <linux/module.h>
20 #include <linux/platform_device.h>
21 #include <drm/drmP.h>
22 #include <drm/drm_atomic.h>
23 #include <drm/drm_atomic_helper.h>
24 #include <drm/drm_fb_helper.h>
25 #include <drm/drm_crtc_helper.h>
26 #include <drm/drm_gem_cma_helper.h>
27 #include <drm/drm_gem_framebuffer_helper.h>
28 #include <drm/drm_fb_cma_helper.h>
29 #include <drm/drm_plane_helper.h>
30 #include <drm/drm_of.h>
31 #include <video/imx-ipu-v3.h>
32
33 #include "imx-drm.h"
34 #include "ipuv3-plane.h"
35
36 #define MAX_CRTC 4
37
38 #if IS_ENABLED(CONFIG_DRM_FBDEV_EMULATION)
39 static int legacyfb_depth = 16;
40 module_param(legacyfb_depth, int, 0444);
41 #endif
42
43 DEFINE_DRM_GEM_CMA_FOPS(imx_drm_driver_fops);
44
imx_drm_connector_destroy(struct drm_connector * connector)45 void imx_drm_connector_destroy(struct drm_connector *connector)
46 {
47 drm_connector_unregister(connector);
48 drm_connector_cleanup(connector);
49 }
50 EXPORT_SYMBOL_GPL(imx_drm_connector_destroy);
51
imx_drm_encoder_destroy(struct drm_encoder * encoder)52 void imx_drm_encoder_destroy(struct drm_encoder *encoder)
53 {
54 drm_encoder_cleanup(encoder);
55 }
56 EXPORT_SYMBOL_GPL(imx_drm_encoder_destroy);
57
imx_drm_atomic_check(struct drm_device * dev,struct drm_atomic_state * state)58 static int imx_drm_atomic_check(struct drm_device *dev,
59 struct drm_atomic_state *state)
60 {
61 int ret;
62
63 ret = drm_atomic_helper_check_modeset(dev, state);
64 if (ret)
65 return ret;
66
67 ret = drm_atomic_helper_check_planes(dev, state);
68 if (ret)
69 return ret;
70
71 /*
72 * Check modeset again in case crtc_state->mode_changed is
73 * updated in plane's ->atomic_check callback.
74 */
75 ret = drm_atomic_helper_check_modeset(dev, state);
76 if (ret)
77 return ret;
78
79 /* Assign PRG/PRE channels and check if all constrains are satisfied. */
80 ret = ipu_planes_assign_pre(dev, state);
81 if (ret)
82 return ret;
83
84 return ret;
85 }
86
87 static const struct drm_mode_config_funcs imx_drm_mode_config_funcs = {
88 .fb_create = drm_gem_fb_create,
89 .output_poll_changed = drm_fb_helper_output_poll_changed,
90 .atomic_check = imx_drm_atomic_check,
91 .atomic_commit = drm_atomic_helper_commit,
92 };
93
imx_drm_atomic_commit_tail(struct drm_atomic_state * state)94 static void imx_drm_atomic_commit_tail(struct drm_atomic_state *state)
95 {
96 struct drm_device *dev = state->dev;
97 struct drm_plane *plane;
98 struct drm_plane_state *old_plane_state, *new_plane_state;
99 bool plane_disabling = false;
100 int i;
101
102 drm_atomic_helper_commit_modeset_disables(dev, state);
103
104 drm_atomic_helper_commit_planes(dev, state,
105 DRM_PLANE_COMMIT_ACTIVE_ONLY |
106 DRM_PLANE_COMMIT_NO_DISABLE_AFTER_MODESET);
107
108 drm_atomic_helper_commit_modeset_enables(dev, state);
109
110 for_each_oldnew_plane_in_state(state, plane, old_plane_state, new_plane_state, i) {
111 if (drm_atomic_plane_disabling(old_plane_state, new_plane_state))
112 plane_disabling = true;
113 }
114
115 /*
116 * The flip done wait is only strictly required by imx-drm if a deferred
117 * plane disable is in-flight. As the core requires blocking commits
118 * to wait for the flip it is done here unconditionally. This keeps the
119 * workitem around a bit longer than required for the majority of
120 * non-blocking commits, but we accept that for the sake of simplicity.
121 */
122 drm_atomic_helper_wait_for_flip_done(dev, state);
123
124 if (plane_disabling) {
125 for_each_old_plane_in_state(state, plane, old_plane_state, i)
126 ipu_plane_disable_deferred(plane);
127
128 }
129
130 drm_atomic_helper_commit_hw_done(state);
131 }
132
133 static const struct drm_mode_config_helper_funcs imx_drm_mode_config_helpers = {
134 .atomic_commit_tail = imx_drm_atomic_commit_tail,
135 };
136
137
imx_drm_encoder_parse_of(struct drm_device * drm,struct drm_encoder * encoder,struct device_node * np)138 int imx_drm_encoder_parse_of(struct drm_device *drm,
139 struct drm_encoder *encoder, struct device_node *np)
140 {
141 uint32_t crtc_mask = drm_of_find_possible_crtcs(drm, np);
142
143 /*
144 * If we failed to find the CRTC(s) which this encoder is
145 * supposed to be connected to, it's because the CRTC has
146 * not been registered yet. Defer probing, and hope that
147 * the required CRTC is added later.
148 */
149 if (crtc_mask == 0)
150 return -EPROBE_DEFER;
151
152 encoder->possible_crtcs = crtc_mask;
153
154 /* FIXME: this is the mask of outputs which can clone this output. */
155 encoder->possible_clones = ~0;
156
157 return 0;
158 }
159 EXPORT_SYMBOL_GPL(imx_drm_encoder_parse_of);
160
161 static const struct drm_ioctl_desc imx_drm_ioctls[] = {
162 /* none so far */
163 };
164
165 static struct drm_driver imx_drm_driver = {
166 .driver_features = DRIVER_MODESET | DRIVER_GEM | DRIVER_PRIME |
167 DRIVER_ATOMIC,
168 .lastclose = drm_fb_helper_lastclose,
169 .gem_free_object_unlocked = drm_gem_cma_free_object,
170 .gem_vm_ops = &drm_gem_cma_vm_ops,
171 .dumb_create = drm_gem_cma_dumb_create,
172
173 .prime_handle_to_fd = drm_gem_prime_handle_to_fd,
174 .prime_fd_to_handle = drm_gem_prime_fd_to_handle,
175 .gem_prime_import = drm_gem_prime_import,
176 .gem_prime_export = drm_gem_prime_export,
177 .gem_prime_get_sg_table = drm_gem_cma_prime_get_sg_table,
178 .gem_prime_import_sg_table = drm_gem_cma_prime_import_sg_table,
179 .gem_prime_vmap = drm_gem_cma_prime_vmap,
180 .gem_prime_vunmap = drm_gem_cma_prime_vunmap,
181 .gem_prime_mmap = drm_gem_cma_prime_mmap,
182 .ioctls = imx_drm_ioctls,
183 .num_ioctls = ARRAY_SIZE(imx_drm_ioctls),
184 .fops = &imx_drm_driver_fops,
185 .name = "imx-drm",
186 .desc = "i.MX DRM graphics",
187 .date = "20120507",
188 .major = 1,
189 .minor = 0,
190 .patchlevel = 0,
191 };
192
compare_of(struct device * dev,void * data)193 static int compare_of(struct device *dev, void *data)
194 {
195 struct device_node *np = data;
196
197 /* Special case for DI, dev->of_node may not be set yet */
198 if (strcmp(dev->driver->name, "imx-ipuv3-crtc") == 0) {
199 struct ipu_client_platformdata *pdata = dev->platform_data;
200
201 return pdata->of_node == np;
202 }
203
204 /* Special case for LDB, one device for two channels */
205 if (of_node_cmp(np->name, "lvds-channel") == 0) {
206 np = of_get_parent(np);
207 of_node_put(np);
208 }
209
210 return dev->of_node == np;
211 }
212
imx_drm_bind(struct device * dev)213 static int imx_drm_bind(struct device *dev)
214 {
215 struct drm_device *drm;
216 int ret;
217
218 drm = drm_dev_alloc(&imx_drm_driver, dev);
219 if (IS_ERR(drm))
220 return PTR_ERR(drm);
221
222 /*
223 * enable drm irq mode.
224 * - with irq_enabled = true, we can use the vblank feature.
225 *
226 * P.S. note that we wouldn't use drm irq handler but
227 * just specific driver own one instead because
228 * drm framework supports only one irq handler and
229 * drivers can well take care of their interrupts
230 */
231 drm->irq_enabled = true;
232
233 /*
234 * set max width and height as default value(4096x4096).
235 * this value would be used to check framebuffer size limitation
236 * at drm_mode_addfb().
237 */
238 drm->mode_config.min_width = 1;
239 drm->mode_config.min_height = 1;
240 drm->mode_config.max_width = 4096;
241 drm->mode_config.max_height = 4096;
242 drm->mode_config.funcs = &imx_drm_mode_config_funcs;
243 drm->mode_config.helper_private = &imx_drm_mode_config_helpers;
244 drm->mode_config.allow_fb_modifiers = true;
245
246 drm_mode_config_init(drm);
247
248 ret = drm_vblank_init(drm, MAX_CRTC);
249 if (ret)
250 goto err_kms;
251
252 dev_set_drvdata(dev, drm);
253
254 /* Now try and bind all our sub-components */
255 ret = component_bind_all(dev, drm);
256 if (ret)
257 goto err_kms;
258
259 drm_mode_config_reset(drm);
260
261 /*
262 * All components are now initialised, so setup the fb helper.
263 * The fb helper takes copies of key hardware information, so the
264 * crtcs/connectors/encoders must not change after this point.
265 */
266 #if IS_ENABLED(CONFIG_DRM_FBDEV_EMULATION)
267 if (legacyfb_depth != 16 && legacyfb_depth != 32) {
268 dev_warn(dev, "Invalid legacyfb_depth. Defaulting to 16bpp\n");
269 legacyfb_depth = 16;
270 }
271 ret = drm_fb_cma_fbdev_init(drm, legacyfb_depth, MAX_CRTC);
272 if (ret)
273 goto err_unbind;
274 #endif
275
276 drm_kms_helper_poll_init(drm);
277
278 ret = drm_dev_register(drm, 0);
279 if (ret)
280 goto err_fbhelper;
281
282 return 0;
283
284 err_fbhelper:
285 drm_kms_helper_poll_fini(drm);
286 #if IS_ENABLED(CONFIG_DRM_FBDEV_EMULATION)
287 drm_fb_cma_fbdev_fini(drm);
288 err_unbind:
289 #endif
290 component_unbind_all(drm->dev, drm);
291 err_kms:
292 drm_mode_config_cleanup(drm);
293 drm_dev_put(drm);
294
295 return ret;
296 }
297
imx_drm_unbind(struct device * dev)298 static void imx_drm_unbind(struct device *dev)
299 {
300 struct drm_device *drm = dev_get_drvdata(dev);
301
302 drm_dev_unregister(drm);
303
304 drm_kms_helper_poll_fini(drm);
305
306 drm_fb_cma_fbdev_fini(drm);
307
308 drm_mode_config_cleanup(drm);
309
310 component_unbind_all(drm->dev, drm);
311 dev_set_drvdata(dev, NULL);
312
313 drm_dev_put(drm);
314 }
315
316 static const struct component_master_ops imx_drm_ops = {
317 .bind = imx_drm_bind,
318 .unbind = imx_drm_unbind,
319 };
320
imx_drm_platform_probe(struct platform_device * pdev)321 static int imx_drm_platform_probe(struct platform_device *pdev)
322 {
323 int ret = drm_of_component_probe(&pdev->dev, compare_of, &imx_drm_ops);
324
325 if (!ret)
326 ret = dma_set_coherent_mask(&pdev->dev, DMA_BIT_MASK(32));
327
328 return ret;
329 }
330
imx_drm_platform_remove(struct platform_device * pdev)331 static int imx_drm_platform_remove(struct platform_device *pdev)
332 {
333 component_master_del(&pdev->dev, &imx_drm_ops);
334 return 0;
335 }
336
337 #ifdef CONFIG_PM_SLEEP
imx_drm_suspend(struct device * dev)338 static int imx_drm_suspend(struct device *dev)
339 {
340 struct drm_device *drm_dev = dev_get_drvdata(dev);
341
342 return drm_mode_config_helper_suspend(drm_dev);
343 }
344
imx_drm_resume(struct device * dev)345 static int imx_drm_resume(struct device *dev)
346 {
347 struct drm_device *drm_dev = dev_get_drvdata(dev);
348
349 return drm_mode_config_helper_resume(drm_dev);
350 }
351 #endif
352
353 static SIMPLE_DEV_PM_OPS(imx_drm_pm_ops, imx_drm_suspend, imx_drm_resume);
354
355 static const struct of_device_id imx_drm_dt_ids[] = {
356 { .compatible = "fsl,imx-display-subsystem", },
357 { /* sentinel */ },
358 };
359 MODULE_DEVICE_TABLE(of, imx_drm_dt_ids);
360
361 static struct platform_driver imx_drm_pdrv = {
362 .probe = imx_drm_platform_probe,
363 .remove = imx_drm_platform_remove,
364 .driver = {
365 .name = "imx-drm",
366 .pm = &imx_drm_pm_ops,
367 .of_match_table = imx_drm_dt_ids,
368 },
369 };
370
371 static struct platform_driver * const drivers[] = {
372 &imx_drm_pdrv,
373 &ipu_drm_driver,
374 };
375
imx_drm_init(void)376 static int __init imx_drm_init(void)
377 {
378 return platform_register_drivers(drivers, ARRAY_SIZE(drivers));
379 }
380 module_init(imx_drm_init);
381
imx_drm_exit(void)382 static void __exit imx_drm_exit(void)
383 {
384 platform_unregister_drivers(drivers, ARRAY_SIZE(drivers));
385 }
386 module_exit(imx_drm_exit);
387
388 MODULE_AUTHOR("Sascha Hauer <s.hauer@pengutronix.de>");
389 MODULE_DESCRIPTION("i.MX drm driver core");
390 MODULE_LICENSE("GPL");
391