1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3 * Freescale i.MX drm driver
4 *
5 * Copyright (C) 2011 Sascha Hauer, Pengutronix
6 */
7
8 #include <linux/component.h>
9 #include <linux/device.h>
10 #include <linux/dma-buf.h>
11 #include <linux/module.h>
12 #include <linux/platform_device.h>
13
14 #include <video/imx-ipu-v3.h>
15
16 #include <drm/clients/drm_client_setup.h>
17 #include <drm/drm_atomic.h>
18 #include <drm/drm_atomic_helper.h>
19 #include <drm/drm_drv.h>
20 #include <drm/drm_fbdev_dma.h>
21 #include <drm/drm_gem_dma_helper.h>
22 #include <drm/drm_gem_framebuffer_helper.h>
23 #include <drm/drm_managed.h>
24 #include <drm/drm_of.h>
25 #include <drm/drm_probe_helper.h>
26 #include <drm/drm_vblank.h>
27
28 #include "imx-drm.h"
29 #include "ipuv3-plane.h"
30
31 #define MAX_CRTC 4
32
33 static int legacyfb_depth = 16;
34 module_param(legacyfb_depth, int, 0444);
35
36 DEFINE_DRM_GEM_DMA_FOPS(imx_drm_driver_fops);
37
imx_drm_atomic_check(struct drm_device * dev,struct drm_atomic_state * state)38 static int imx_drm_atomic_check(struct drm_device *dev,
39 struct drm_atomic_state *state)
40 {
41 int ret;
42
43 ret = drm_atomic_helper_check(dev, state);
44 if (ret)
45 return ret;
46
47 /*
48 * Check modeset again in case crtc_state->mode_changed is
49 * updated in plane's ->atomic_check callback.
50 */
51 ret = drm_atomic_helper_check_modeset(dev, state);
52 if (ret)
53 return ret;
54
55 /* Assign PRG/PRE channels and check if all constrains are satisfied. */
56 ret = ipu_planes_assign_pre(dev, state);
57 if (ret)
58 return ret;
59
60 return ret;
61 }
62
63 static const struct drm_mode_config_funcs imx_drm_mode_config_funcs = {
64 .fb_create = drm_gem_fb_create,
65 .atomic_check = imx_drm_atomic_check,
66 .atomic_commit = drm_atomic_helper_commit,
67 };
68
imx_drm_atomic_commit_tail(struct drm_atomic_state * state)69 static void imx_drm_atomic_commit_tail(struct drm_atomic_state *state)
70 {
71 struct drm_device *dev = state->dev;
72 struct drm_plane *plane;
73 struct drm_plane_state *old_plane_state, *new_plane_state;
74 bool plane_disabling = false;
75 int i;
76
77 drm_atomic_helper_commit_modeset_disables(dev, state);
78
79 drm_atomic_helper_commit_planes(dev, state,
80 DRM_PLANE_COMMIT_ACTIVE_ONLY |
81 DRM_PLANE_COMMIT_NO_DISABLE_AFTER_MODESET);
82
83 drm_atomic_helper_commit_modeset_enables(dev, state);
84
85 for_each_oldnew_plane_in_state(state, plane, old_plane_state, new_plane_state, i) {
86 if (drm_atomic_plane_disabling(old_plane_state, new_plane_state))
87 plane_disabling = true;
88 }
89
90 /*
91 * The flip done wait is only strictly required by imx-drm if a deferred
92 * plane disable is in-flight. As the core requires blocking commits
93 * to wait for the flip it is done here unconditionally. This keeps the
94 * workitem around a bit longer than required for the majority of
95 * non-blocking commits, but we accept that for the sake of simplicity.
96 */
97 drm_atomic_helper_wait_for_flip_done(dev, state);
98
99 if (plane_disabling) {
100 for_each_old_plane_in_state(state, plane, old_plane_state, i)
101 ipu_plane_disable_deferred(plane);
102
103 }
104
105 drm_atomic_helper_commit_hw_done(state);
106 }
107
108 static const struct drm_mode_config_helper_funcs imx_drm_mode_config_helpers = {
109 .atomic_commit_tail = imx_drm_atomic_commit_tail,
110 };
111
112
imx_drm_encoder_parse_of(struct drm_device * drm,struct drm_encoder * encoder,struct device_node * np)113 int imx_drm_encoder_parse_of(struct drm_device *drm,
114 struct drm_encoder *encoder, struct device_node *np)
115 {
116 uint32_t crtc_mask = drm_of_find_possible_crtcs(drm, np);
117
118 /*
119 * If we failed to find the CRTC(s) which this encoder is
120 * supposed to be connected to, it's because the CRTC has
121 * not been registered yet. Defer probing, and hope that
122 * the required CRTC is added later.
123 */
124 if (crtc_mask == 0)
125 return -EPROBE_DEFER;
126
127 encoder->possible_crtcs = crtc_mask;
128
129 /* FIXME: cloning support not clear, disable it all for now */
130 encoder->possible_clones = 0;
131
132 return 0;
133 }
134 EXPORT_SYMBOL_GPL(imx_drm_encoder_parse_of);
135
136 static const struct drm_ioctl_desc imx_drm_ioctls[] = {
137 /* none so far */
138 };
139
imx_drm_dumb_create(struct drm_file * file_priv,struct drm_device * drm,struct drm_mode_create_dumb * args)140 static int imx_drm_dumb_create(struct drm_file *file_priv,
141 struct drm_device *drm,
142 struct drm_mode_create_dumb *args)
143 {
144 u32 width = args->width;
145 int ret;
146
147 args->width = ALIGN(width, 8);
148
149 ret = drm_gem_dma_dumb_create(file_priv, drm, args);
150 if (ret)
151 return ret;
152
153 args->width = width;
154 return ret;
155 }
156
157 static const struct drm_driver imx_drm_driver = {
158 .driver_features = DRIVER_MODESET | DRIVER_GEM | DRIVER_ATOMIC,
159 DRM_GEM_DMA_DRIVER_OPS_WITH_DUMB_CREATE(imx_drm_dumb_create),
160 DRM_FBDEV_DMA_DRIVER_OPS,
161 .ioctls = imx_drm_ioctls,
162 .num_ioctls = ARRAY_SIZE(imx_drm_ioctls),
163 .fops = &imx_drm_driver_fops,
164 .name = "imx-drm",
165 .desc = "i.MX DRM graphics",
166 .major = 1,
167 .minor = 0,
168 .patchlevel = 0,
169 };
170
compare_of(struct device * dev,void * data)171 static int compare_of(struct device *dev, void *data)
172 {
173 struct device_node *np = data;
174
175 /* Special case for DI, dev->of_node may not be set yet */
176 if (strcmp(dev->driver->name, "imx-ipuv3-crtc") == 0) {
177 struct ipu_client_platformdata *pdata = dev->platform_data;
178
179 return pdata->of_node == np;
180 }
181
182 /* Special case for LDB, one device for two channels */
183 if (of_node_name_eq(np, "lvds-channel")) {
184 np = of_get_parent(np);
185 of_node_put(np);
186 }
187
188 return dev->of_node == np;
189 }
190
imx_drm_bind(struct device * dev)191 static int imx_drm_bind(struct device *dev)
192 {
193 struct drm_device *drm;
194 int ret;
195
196 drm = drm_dev_alloc(&imx_drm_driver, dev);
197 if (IS_ERR(drm))
198 return PTR_ERR(drm);
199
200 /*
201 * set max width and height as default value(4096x4096).
202 * this value would be used to check framebuffer size limitation
203 * at drm_mode_addfb().
204 */
205 drm->mode_config.min_width = 1;
206 drm->mode_config.min_height = 1;
207 drm->mode_config.max_width = 4096;
208 drm->mode_config.max_height = 4096;
209 drm->mode_config.funcs = &imx_drm_mode_config_funcs;
210 drm->mode_config.helper_private = &imx_drm_mode_config_helpers;
211 drm->mode_config.normalize_zpos = true;
212
213 ret = drmm_mode_config_init(drm);
214 if (ret)
215 goto err_kms;
216
217 ret = drm_vblank_init(drm, MAX_CRTC);
218 if (ret)
219 goto err_kms;
220
221 dev_set_drvdata(dev, drm);
222
223 /* Now try and bind all our sub-components */
224 ret = component_bind_all(dev, drm);
225 if (ret)
226 goto err_kms;
227
228 drm_mode_config_reset(drm);
229
230 /*
231 * All components are now initialised, so setup the fb helper.
232 * The fb helper takes copies of key hardware information, so the
233 * crtcs/connectors/encoders must not change after this point.
234 */
235 if (legacyfb_depth != 16 && legacyfb_depth != 32) {
236 dev_warn(dev, "Invalid legacyfb_depth. Defaulting to 16bpp\n");
237 legacyfb_depth = 16;
238 }
239
240 drm_kms_helper_poll_init(drm);
241
242 ret = drm_dev_register(drm, 0);
243 if (ret)
244 goto err_poll_fini;
245
246 drm_client_setup_with_color_mode(drm, legacyfb_depth);
247
248 return 0;
249
250 err_poll_fini:
251 drm_kms_helper_poll_fini(drm);
252 component_unbind_all(drm->dev, drm);
253 err_kms:
254 dev_set_drvdata(dev, NULL);
255 drm_dev_put(drm);
256
257 return ret;
258 }
259
imx_drm_unbind(struct device * dev)260 static void imx_drm_unbind(struct device *dev)
261 {
262 struct drm_device *drm = dev_get_drvdata(dev);
263
264 drm_dev_unregister(drm);
265
266 drm_kms_helper_poll_fini(drm);
267 drm_atomic_helper_shutdown(drm);
268
269 component_unbind_all(drm->dev, drm);
270
271 drm_dev_put(drm);
272
273 dev_set_drvdata(dev, NULL);
274 }
275
276 static const struct component_master_ops imx_drm_ops = {
277 .bind = imx_drm_bind,
278 .unbind = imx_drm_unbind,
279 };
280
imx_drm_platform_probe(struct platform_device * pdev)281 static int imx_drm_platform_probe(struct platform_device *pdev)
282 {
283 int ret = drm_of_component_probe(&pdev->dev, compare_of, &imx_drm_ops);
284
285 if (!ret)
286 ret = dma_set_coherent_mask(&pdev->dev, DMA_BIT_MASK(32));
287
288 return ret;
289 }
290
imx_drm_platform_remove(struct platform_device * pdev)291 static void imx_drm_platform_remove(struct platform_device *pdev)
292 {
293 component_master_del(&pdev->dev, &imx_drm_ops);
294 }
295
imx_drm_platform_shutdown(struct platform_device * pdev)296 static void imx_drm_platform_shutdown(struct platform_device *pdev)
297 {
298 drm_atomic_helper_shutdown(platform_get_drvdata(pdev));
299 }
300
301 #ifdef CONFIG_PM_SLEEP
imx_drm_suspend(struct device * dev)302 static int imx_drm_suspend(struct device *dev)
303 {
304 struct drm_device *drm_dev = dev_get_drvdata(dev);
305
306 return drm_mode_config_helper_suspend(drm_dev);
307 }
308
imx_drm_resume(struct device * dev)309 static int imx_drm_resume(struct device *dev)
310 {
311 struct drm_device *drm_dev = dev_get_drvdata(dev);
312
313 return drm_mode_config_helper_resume(drm_dev);
314 }
315 #endif
316
317 static SIMPLE_DEV_PM_OPS(imx_drm_pm_ops, imx_drm_suspend, imx_drm_resume);
318
319 static const struct of_device_id imx_drm_dt_ids[] = {
320 { .compatible = "fsl,imx-display-subsystem", },
321 { /* sentinel */ },
322 };
323 MODULE_DEVICE_TABLE(of, imx_drm_dt_ids);
324
325 static struct platform_driver imx_drm_pdrv = {
326 .probe = imx_drm_platform_probe,
327 .remove = imx_drm_platform_remove,
328 .shutdown = imx_drm_platform_shutdown,
329 .driver = {
330 .name = "imx-drm",
331 .pm = &imx_drm_pm_ops,
332 .of_match_table = imx_drm_dt_ids,
333 },
334 };
335
336 static struct platform_driver * const drivers[] = {
337 &imx_drm_pdrv,
338 &ipu_drm_driver,
339 };
340
imx_drm_init(void)341 static int __init imx_drm_init(void)
342 {
343 if (drm_firmware_drivers_only())
344 return -ENODEV;
345
346 return platform_register_drivers(drivers, ARRAY_SIZE(drivers));
347 }
348 module_init(imx_drm_init);
349
imx_drm_exit(void)350 static void __exit imx_drm_exit(void)
351 {
352 platform_unregister_drivers(drivers, ARRAY_SIZE(drivers));
353 }
354 module_exit(imx_drm_exit);
355
356 MODULE_AUTHOR("Sascha Hauer <s.hauer@pengutronix.de>");
357 MODULE_DESCRIPTION("i.MX drm driver core");
358 MODULE_LICENSE("GPL");
359