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_dumb_buffers.h>
21 #include <drm/drm_fbdev_dma.h>
22 #include <drm/drm_fourcc.h>
23 #include <drm/drm_gem_dma_helper.h>
24 #include <drm/drm_gem_framebuffer_helper.h>
25 #include <drm/drm_managed.h>
26 #include <drm/drm_of.h>
27 #include <drm/drm_probe_helper.h>
28 #include <drm/drm_vblank.h>
29
30 #include "imx-drm.h"
31 #include "ipuv3-plane.h"
32
33 #define MAX_CRTC 4
34
35 static int legacyfb_depth = 16;
36 module_param(legacyfb_depth, int, 0444);
37
38 DEFINE_DRM_GEM_DMA_FOPS(imx_drm_driver_fops);
39
imx_drm_atomic_check(struct drm_device * dev,struct drm_atomic_state * state)40 static int imx_drm_atomic_check(struct drm_device *dev,
41 struct drm_atomic_state *state)
42 {
43 int ret;
44
45 ret = drm_atomic_helper_check(dev, state);
46 if (ret)
47 return ret;
48
49 /*
50 * Check modeset again in case crtc_state->mode_changed is
51 * updated in plane's ->atomic_check callback.
52 */
53 ret = drm_atomic_helper_check_modeset(dev, state);
54 if (ret)
55 return ret;
56
57 /* Assign PRG/PRE channels and check if all constrains are satisfied. */
58 ret = ipu_planes_assign_pre(dev, state);
59 if (ret)
60 return ret;
61
62 return ret;
63 }
64
65 static const struct drm_mode_config_funcs imx_drm_mode_config_funcs = {
66 .fb_create = drm_gem_fb_create,
67 .atomic_check = imx_drm_atomic_check,
68 .atomic_commit = drm_atomic_helper_commit,
69 };
70
imx_drm_atomic_commit_tail(struct drm_atomic_state * state)71 static void imx_drm_atomic_commit_tail(struct drm_atomic_state *state)
72 {
73 struct drm_device *dev = state->dev;
74 struct drm_plane *plane;
75 struct drm_plane_state *old_plane_state, *new_plane_state;
76 bool plane_disabling = false;
77 int i;
78
79 drm_atomic_helper_commit_modeset_disables(dev, state);
80
81 drm_atomic_helper_commit_planes(dev, state,
82 DRM_PLANE_COMMIT_ACTIVE_ONLY |
83 DRM_PLANE_COMMIT_NO_DISABLE_AFTER_MODESET);
84
85 drm_atomic_helper_commit_modeset_enables(dev, state);
86
87 for_each_oldnew_plane_in_state(state, plane, old_plane_state, new_plane_state, i) {
88 if (drm_atomic_plane_disabling(old_plane_state, new_plane_state))
89 plane_disabling = true;
90 }
91
92 /*
93 * The flip done wait is only strictly required by imx-drm if a deferred
94 * plane disable is in-flight. As the core requires blocking commits
95 * to wait for the flip it is done here unconditionally. This keeps the
96 * workitem around a bit longer than required for the majority of
97 * non-blocking commits, but we accept that for the sake of simplicity.
98 */
99 drm_atomic_helper_wait_for_flip_done(dev, state);
100
101 if (plane_disabling) {
102 for_each_old_plane_in_state(state, plane, old_plane_state, i)
103 ipu_plane_disable_deferred(plane);
104
105 }
106
107 drm_atomic_helper_commit_hw_done(state);
108 }
109
110 static const struct drm_mode_config_helper_funcs imx_drm_mode_config_helpers = {
111 .atomic_commit_tail = imx_drm_atomic_commit_tail,
112 };
113
114
imx_drm_encoder_parse_of(struct drm_device * drm,struct drm_encoder * encoder,struct device_node * np)115 int imx_drm_encoder_parse_of(struct drm_device *drm,
116 struct drm_encoder *encoder, struct device_node *np)
117 {
118 uint32_t crtc_mask = drm_of_find_possible_crtcs(drm, np);
119
120 /*
121 * If we failed to find the CRTC(s) which this encoder is
122 * supposed to be connected to, it's because the CRTC has
123 * not been registered yet. Defer probing, and hope that
124 * the required CRTC is added later.
125 */
126 if (crtc_mask == 0)
127 return -EPROBE_DEFER;
128
129 encoder->possible_crtcs = crtc_mask;
130
131 /* FIXME: cloning support not clear, disable it all for now */
132 encoder->possible_clones = 0;
133
134 return 0;
135 }
136 EXPORT_SYMBOL_GPL(imx_drm_encoder_parse_of);
137
138 static const struct drm_ioctl_desc imx_drm_ioctls[] = {
139 /* none so far */
140 };
141
imx_drm_dumb_create(struct drm_file * file_priv,struct drm_device * drm,struct drm_mode_create_dumb * args)142 static int imx_drm_dumb_create(struct drm_file *file_priv,
143 struct drm_device *drm,
144 struct drm_mode_create_dumb *args)
145 {
146 u32 fourcc;
147 u64 pitch_align;
148 int ret;
149
150 /*
151 * Hardware requires the framebuffer width to be aligned to
152 * multiples of 8. The mode-setting code handles this, but
153 * the buffer pitch has to be aligned as well. Set the pitch
154 * alignment accordingly, so that the each scanline fits into
155 * the allocated buffer.
156 */
157 fourcc = drm_driver_color_mode_format(drm, args->bpp);
158 if (fourcc != DRM_FORMAT_INVALID) {
159 const struct drm_format_info *info = drm_format_info(fourcc);
160
161 if (!info)
162 return -EINVAL;
163 pitch_align = drm_format_info_min_pitch(info, 0, 8);
164 } else {
165 pitch_align = DIV_ROUND_UP(args->bpp, SZ_8) * 8;
166 }
167 if (!pitch_align || pitch_align > U32_MAX)
168 return -EINVAL;
169 ret = drm_mode_size_dumb(drm, args, pitch_align, 0);
170 if (ret)
171 return ret;
172
173 return drm_gem_dma_dumb_create(file_priv, drm, args);
174 }
175
176 static const struct drm_driver imx_drm_driver = {
177 .driver_features = DRIVER_MODESET | DRIVER_GEM | DRIVER_ATOMIC,
178 DRM_GEM_DMA_DRIVER_OPS_WITH_DUMB_CREATE(imx_drm_dumb_create),
179 DRM_FBDEV_DMA_DRIVER_OPS,
180 .ioctls = imx_drm_ioctls,
181 .num_ioctls = ARRAY_SIZE(imx_drm_ioctls),
182 .fops = &imx_drm_driver_fops,
183 .name = "imx-drm",
184 .desc = "i.MX DRM graphics",
185 .major = 1,
186 .minor = 0,
187 .patchlevel = 0,
188 };
189
compare_of(struct device * dev,void * data)190 static int compare_of(struct device *dev, void *data)
191 {
192 struct device_node *np = data;
193
194 /* Special case for DI, dev->of_node may not be set yet */
195 if (strcmp(dev->driver->name, "imx-ipuv3-crtc") == 0) {
196 struct ipu_client_platformdata *pdata = dev->platform_data;
197
198 return pdata->of_node == np;
199 }
200
201 /* Special case for LDB, one device for two channels */
202 if (of_node_name_eq(np, "lvds-channel")) {
203 np = of_get_parent(np);
204 of_node_put(np);
205 }
206
207 return dev->of_node == np;
208 }
209
imx_drm_bind(struct device * dev)210 static int imx_drm_bind(struct device *dev)
211 {
212 struct drm_device *drm;
213 int ret;
214
215 drm = drm_dev_alloc(&imx_drm_driver, dev);
216 if (IS_ERR(drm))
217 return PTR_ERR(drm);
218
219 /*
220 * set max width and height as default value(4096x4096).
221 * this value would be used to check framebuffer size limitation
222 * at drm_mode_addfb().
223 */
224 drm->mode_config.min_width = 1;
225 drm->mode_config.min_height = 1;
226 drm->mode_config.max_width = 4096;
227 drm->mode_config.max_height = 4096;
228 drm->mode_config.funcs = &imx_drm_mode_config_funcs;
229 drm->mode_config.helper_private = &imx_drm_mode_config_helpers;
230 drm->mode_config.normalize_zpos = true;
231
232 ret = drmm_mode_config_init(drm);
233 if (ret)
234 goto err_kms;
235
236 ret = drm_vblank_init(drm, MAX_CRTC);
237 if (ret)
238 goto err_kms;
239
240 dev_set_drvdata(dev, drm);
241
242 /* Now try and bind all our sub-components */
243 ret = component_bind_all(dev, drm);
244 if (ret)
245 goto err_kms;
246
247 drm_mode_config_reset(drm);
248
249 /*
250 * All components are now initialised, so setup the fb helper.
251 * The fb helper takes copies of key hardware information, so the
252 * crtcs/connectors/encoders must not change after this point.
253 */
254 if (legacyfb_depth != 16 && legacyfb_depth != 32) {
255 dev_warn(dev, "Invalid legacyfb_depth. Defaulting to 16bpp\n");
256 legacyfb_depth = 16;
257 }
258
259 drm_kms_helper_poll_init(drm);
260
261 ret = drm_dev_register(drm, 0);
262 if (ret)
263 goto err_poll_fini;
264
265 drm_client_setup_with_color_mode(drm, legacyfb_depth);
266
267 return 0;
268
269 err_poll_fini:
270 drm_kms_helper_poll_fini(drm);
271 component_unbind_all(drm->dev, drm);
272 err_kms:
273 dev_set_drvdata(dev, NULL);
274 drm_dev_put(drm);
275
276 return ret;
277 }
278
imx_drm_unbind(struct device * dev)279 static void imx_drm_unbind(struct device *dev)
280 {
281 struct drm_device *drm = dev_get_drvdata(dev);
282
283 drm_dev_unregister(drm);
284
285 drm_kms_helper_poll_fini(drm);
286 drm_atomic_helper_shutdown(drm);
287
288 component_unbind_all(drm->dev, drm);
289
290 drm_dev_put(drm);
291
292 dev_set_drvdata(dev, NULL);
293 }
294
295 static const struct component_master_ops imx_drm_ops = {
296 .bind = imx_drm_bind,
297 .unbind = imx_drm_unbind,
298 };
299
imx_drm_platform_probe(struct platform_device * pdev)300 static int imx_drm_platform_probe(struct platform_device *pdev)
301 {
302 int ret = drm_of_component_probe(&pdev->dev, compare_of, &imx_drm_ops);
303
304 if (!ret)
305 ret = dma_set_coherent_mask(&pdev->dev, DMA_BIT_MASK(32));
306
307 return ret;
308 }
309
imx_drm_platform_remove(struct platform_device * pdev)310 static void imx_drm_platform_remove(struct platform_device *pdev)
311 {
312 component_master_del(&pdev->dev, &imx_drm_ops);
313 }
314
imx_drm_platform_shutdown(struct platform_device * pdev)315 static void imx_drm_platform_shutdown(struct platform_device *pdev)
316 {
317 drm_atomic_helper_shutdown(platform_get_drvdata(pdev));
318 }
319
320 #ifdef CONFIG_PM_SLEEP
imx_drm_suspend(struct device * dev)321 static int imx_drm_suspend(struct device *dev)
322 {
323 struct drm_device *drm_dev = dev_get_drvdata(dev);
324
325 return drm_mode_config_helper_suspend(drm_dev);
326 }
327
imx_drm_resume(struct device * dev)328 static int imx_drm_resume(struct device *dev)
329 {
330 struct drm_device *drm_dev = dev_get_drvdata(dev);
331
332 return drm_mode_config_helper_resume(drm_dev);
333 }
334 #endif
335
336 static SIMPLE_DEV_PM_OPS(imx_drm_pm_ops, imx_drm_suspend, imx_drm_resume);
337
338 static const struct of_device_id imx_drm_dt_ids[] = {
339 { .compatible = "fsl,imx-display-subsystem", },
340 { /* sentinel */ },
341 };
342 MODULE_DEVICE_TABLE(of, imx_drm_dt_ids);
343
344 static struct platform_driver imx_drm_pdrv = {
345 .probe = imx_drm_platform_probe,
346 .remove = imx_drm_platform_remove,
347 .shutdown = imx_drm_platform_shutdown,
348 .driver = {
349 .name = "imx-drm",
350 .pm = &imx_drm_pm_ops,
351 .of_match_table = imx_drm_dt_ids,
352 },
353 };
354
355 static struct platform_driver * const drivers[] = {
356 &imx_drm_pdrv,
357 &ipu_drm_driver,
358 };
359
imx_drm_init(void)360 static int __init imx_drm_init(void)
361 {
362 if (drm_firmware_drivers_only())
363 return -ENODEV;
364
365 return platform_register_drivers(drivers, ARRAY_SIZE(drivers));
366 }
367 module_init(imx_drm_init);
368
imx_drm_exit(void)369 static void __exit imx_drm_exit(void)
370 {
371 platform_unregister_drivers(drivers, ARRAY_SIZE(drivers));
372 }
373 module_exit(imx_drm_exit);
374
375 MODULE_AUTHOR("Sascha Hauer <s.hauer@pengutronix.de>");
376 MODULE_DESCRIPTION("i.MX drm driver core");
377 MODULE_LICENSE("GPL");
378