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/drm_atomic.h>
17#include <drm/drm_atomic_helper.h>
18#include <drm/drm_drv.h>
19#include <drm/drm_fbdev_dma.h>
20#include <drm/drm_gem_dma_helper.h>
21#include <drm/drm_gem_framebuffer_helper.h>
22#include <drm/drm_managed.h>
23#include <drm/drm_of.h>
24#include <drm/drm_probe_helper.h>
25#include <drm/drm_vblank.h>
26
27#include "imx-drm.h"
28#include "ipuv3-plane.h"
29
30#define MAX_CRTC 4
31
32static int legacyfb_depth = 16;
33module_param(legacyfb_depth, int, 0444);
34
35DEFINE_DRM_GEM_DMA_FOPS(imx_drm_driver_fops);
36
37void imx_drm_connector_destroy(struct drm_connector *connector)
38{
39 drm_connector_unregister(connector);
40 drm_connector_cleanup(connector);
41}
42EXPORT_SYMBOL_GPL(imx_drm_connector_destroy);
43
44static int imx_drm_atomic_check(struct drm_device *dev,
45 struct drm_atomic_state *state)
46{
47 int ret;
48
49 ret = drm_atomic_helper_check(dev, state);
50 if (ret)
51 return ret;
52
53 /*
54 * Check modeset again in case crtc_state->mode_changed is
55 * updated in plane's ->atomic_check callback.
56 */
57 ret = drm_atomic_helper_check_modeset(dev, state);
58 if (ret)
59 return ret;
60
61 /* Assign PRG/PRE channels and check if all constrains are satisfied. */
62 ret = ipu_planes_assign_pre(dev, state);
63 if (ret)
64 return ret;
65
66 return ret;
67}
68
69static const struct drm_mode_config_funcs imx_drm_mode_config_funcs = {
70 .fb_create = drm_gem_fb_create,
71 .atomic_check = imx_drm_atomic_check,
72 .atomic_commit = drm_atomic_helper_commit,
73};
74
75static void imx_drm_atomic_commit_tail(struct drm_atomic_state *state)
76{
77 struct drm_device *dev = state->dev;
78 struct drm_plane *plane;
79 struct drm_plane_state *old_plane_state, *new_plane_state;
80 bool plane_disabling = false;
81 int i;
82
83 drm_atomic_helper_commit_modeset_disables(dev, state);
84
85 drm_atomic_helper_commit_planes(dev, state,
86 DRM_PLANE_COMMIT_ACTIVE_ONLY |
87 DRM_PLANE_COMMIT_NO_DISABLE_AFTER_MODESET);
88
89 drm_atomic_helper_commit_modeset_enables(dev, old_state: state);
90
91 for_each_oldnew_plane_in_state(state, plane, old_plane_state, new_plane_state, i) {
92 if (drm_atomic_plane_disabling(old_plane_state, new_plane_state))
93 plane_disabling = true;
94 }
95
96 /*
97 * The flip done wait is only strictly required by imx-drm if a deferred
98 * plane disable is in-flight. As the core requires blocking commits
99 * to wait for the flip it is done here unconditionally. This keeps the
100 * workitem around a bit longer than required for the majority of
101 * non-blocking commits, but we accept that for the sake of simplicity.
102 */
103 drm_atomic_helper_wait_for_flip_done(dev, old_state: state);
104
105 if (plane_disabling) {
106 for_each_old_plane_in_state(state, plane, old_plane_state, i)
107 ipu_plane_disable_deferred(plane);
108
109 }
110
111 drm_atomic_helper_commit_hw_done(state);
112}
113
114static const struct drm_mode_config_helper_funcs imx_drm_mode_config_helpers = {
115 .atomic_commit_tail = imx_drm_atomic_commit_tail,
116};
117
118
119int imx_drm_encoder_parse_of(struct drm_device *drm,
120 struct drm_encoder *encoder, struct device_node *np)
121{
122 uint32_t crtc_mask = drm_of_find_possible_crtcs(dev: drm, port: np);
123
124 /*
125 * If we failed to find the CRTC(s) which this encoder is
126 * supposed to be connected to, it's because the CRTC has
127 * not been registered yet. Defer probing, and hope that
128 * the required CRTC is added later.
129 */
130 if (crtc_mask == 0)
131 return -EPROBE_DEFER;
132
133 encoder->possible_crtcs = crtc_mask;
134
135 /* FIXME: cloning support not clear, disable it all for now */
136 encoder->possible_clones = 0;
137
138 return 0;
139}
140EXPORT_SYMBOL_GPL(imx_drm_encoder_parse_of);
141
142static const struct drm_ioctl_desc imx_drm_ioctls[] = {
143 /* none so far */
144};
145
146static int imx_drm_dumb_create(struct drm_file *file_priv,
147 struct drm_device *drm,
148 struct drm_mode_create_dumb *args)
149{
150 u32 width = args->width;
151 int ret;
152
153 args->width = ALIGN(width, 8);
154
155 ret = drm_gem_dma_dumb_create(file_priv, drm, args);
156 if (ret)
157 return ret;
158
159 args->width = width;
160 return ret;
161}
162
163static const struct drm_driver imx_drm_driver = {
164 .driver_features = DRIVER_MODESET | DRIVER_GEM | DRIVER_ATOMIC,
165 DRM_GEM_DMA_DRIVER_OPS_WITH_DUMB_CREATE(imx_drm_dumb_create),
166 .ioctls = imx_drm_ioctls,
167 .num_ioctls = ARRAY_SIZE(imx_drm_ioctls),
168 .fops = &imx_drm_driver_fops,
169 .name = "imx-drm",
170 .desc = "i.MX DRM graphics",
171 .date = "20120507",
172 .major = 1,
173 .minor = 0,
174 .patchlevel = 0,
175};
176
177static int compare_of(struct device *dev, void *data)
178{
179 struct device_node *np = data;
180
181 /* Special case for DI, dev->of_node may not be set yet */
182 if (strcmp(dev->driver->name, "imx-ipuv3-crtc") == 0) {
183 struct ipu_client_platformdata *pdata = dev->platform_data;
184
185 return pdata->of_node == np;
186 }
187
188 /* Special case for LDB, one device for two channels */
189 if (of_node_name_eq(np, name: "lvds-channel")) {
190 np = of_get_parent(node: np);
191 of_node_put(node: np);
192 }
193
194 return dev->of_node == np;
195}
196
197static int imx_drm_bind(struct device *dev)
198{
199 struct drm_device *drm;
200 int ret;
201
202 drm = drm_dev_alloc(driver: &imx_drm_driver, parent: dev);
203 if (IS_ERR(ptr: drm))
204 return PTR_ERR(ptr: drm);
205
206 /*
207 * set max width and height as default value(4096x4096).
208 * this value would be used to check framebuffer size limitation
209 * at drm_mode_addfb().
210 */
211 drm->mode_config.min_width = 1;
212 drm->mode_config.min_height = 1;
213 drm->mode_config.max_width = 4096;
214 drm->mode_config.max_height = 4096;
215 drm->mode_config.funcs = &imx_drm_mode_config_funcs;
216 drm->mode_config.helper_private = &imx_drm_mode_config_helpers;
217 drm->mode_config.normalize_zpos = true;
218
219 ret = drmm_mode_config_init(dev: drm);
220 if (ret)
221 goto err_kms;
222
223 ret = drm_vblank_init(dev: drm, MAX_CRTC);
224 if (ret)
225 goto err_kms;
226
227 dev_set_drvdata(dev, data: drm);
228
229 /* Now try and bind all our sub-components */
230 ret = component_bind_all(parent: dev, data: drm);
231 if (ret)
232 goto err_kms;
233
234 drm_mode_config_reset(dev: drm);
235
236 /*
237 * All components are now initialised, so setup the fb helper.
238 * The fb helper takes copies of key hardware information, so the
239 * crtcs/connectors/encoders must not change after this point.
240 */
241 if (legacyfb_depth != 16 && legacyfb_depth != 32) {
242 dev_warn(dev, "Invalid legacyfb_depth. Defaulting to 16bpp\n");
243 legacyfb_depth = 16;
244 }
245
246 drm_kms_helper_poll_init(dev: drm);
247
248 ret = drm_dev_register(dev: drm, flags: 0);
249 if (ret)
250 goto err_poll_fini;
251
252 drm_fbdev_dma_setup(dev: drm, preferred_bpp: legacyfb_depth);
253
254 return 0;
255
256err_poll_fini:
257 drm_kms_helper_poll_fini(dev: drm);
258 component_unbind_all(parent: drm->dev, data: drm);
259err_kms:
260 dev_set_drvdata(dev, NULL);
261 drm_dev_put(dev: drm);
262
263 return ret;
264}
265
266static void imx_drm_unbind(struct device *dev)
267{
268 struct drm_device *drm = dev_get_drvdata(dev);
269
270 drm_dev_unregister(dev: drm);
271
272 drm_kms_helper_poll_fini(dev: drm);
273 drm_atomic_helper_shutdown(dev: drm);
274
275 component_unbind_all(parent: drm->dev, data: drm);
276
277 drm_dev_put(dev: drm);
278
279 dev_set_drvdata(dev, NULL);
280}
281
282static const struct component_master_ops imx_drm_ops = {
283 .bind = imx_drm_bind,
284 .unbind = imx_drm_unbind,
285};
286
287static int imx_drm_platform_probe(struct platform_device *pdev)
288{
289 int ret = drm_of_component_probe(dev: &pdev->dev, compare_of, m_ops: &imx_drm_ops);
290
291 if (!ret)
292 ret = dma_set_coherent_mask(dev: &pdev->dev, DMA_BIT_MASK(32));
293
294 return ret;
295}
296
297static void imx_drm_platform_remove(struct platform_device *pdev)
298{
299 component_master_del(&pdev->dev, &imx_drm_ops);
300}
301
302static void imx_drm_platform_shutdown(struct platform_device *pdev)
303{
304 drm_atomic_helper_shutdown(dev: platform_get_drvdata(pdev));
305}
306
307#ifdef CONFIG_PM_SLEEP
308static int imx_drm_suspend(struct device *dev)
309{
310 struct drm_device *drm_dev = dev_get_drvdata(dev);
311
312 return drm_mode_config_helper_suspend(dev: drm_dev);
313}
314
315static int imx_drm_resume(struct device *dev)
316{
317 struct drm_device *drm_dev = dev_get_drvdata(dev);
318
319 return drm_mode_config_helper_resume(dev: drm_dev);
320}
321#endif
322
323static SIMPLE_DEV_PM_OPS(imx_drm_pm_ops, imx_drm_suspend, imx_drm_resume);
324
325static const struct of_device_id imx_drm_dt_ids[] = {
326 { .compatible = "fsl,imx-display-subsystem", },
327 { /* sentinel */ },
328};
329MODULE_DEVICE_TABLE(of, imx_drm_dt_ids);
330
331static struct platform_driver imx_drm_pdrv = {
332 .probe = imx_drm_platform_probe,
333 .remove_new = imx_drm_platform_remove,
334 .shutdown = imx_drm_platform_shutdown,
335 .driver = {
336 .name = "imx-drm",
337 .pm = &imx_drm_pm_ops,
338 .of_match_table = imx_drm_dt_ids,
339 },
340};
341
342static struct platform_driver * const drivers[] = {
343 &imx_drm_pdrv,
344 &ipu_drm_driver,
345};
346
347static int __init imx_drm_init(void)
348{
349 if (drm_firmware_drivers_only())
350 return -ENODEV;
351
352 return platform_register_drivers(drivers, ARRAY_SIZE(drivers));
353}
354module_init(imx_drm_init);
355
356static void __exit imx_drm_exit(void)
357{
358 platform_unregister_drivers(drivers, ARRAY_SIZE(drivers));
359}
360module_exit(imx_drm_exit);
361
362MODULE_AUTHOR("Sascha Hauer <s.hauer@pengutronix.de>");
363MODULE_DESCRIPTION("i.MX drm driver core");
364MODULE_LICENSE("GPL");
365

source code of linux/drivers/gpu/drm/imx/ipuv3/imx-drm-core.c