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_client_setup.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
 33static int legacyfb_depth = 16;
 34module_param(legacyfb_depth, int, 0444);
 35
 36DEFINE_DRM_GEM_DMA_FOPS(imx_drm_driver_fops);
 37
 38static 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
 63static 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
 69static 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
108static const struct drm_mode_config_helper_funcs imx_drm_mode_config_helpers = {
109	.atomic_commit_tail = imx_drm_atomic_commit_tail,
110};
111
112
113int 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}
134EXPORT_SYMBOL_GPL(imx_drm_encoder_parse_of);
135
136static const struct drm_ioctl_desc imx_drm_ioctls[] = {
137	/* none so far */
138};
139
140static 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
157static 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	.date			= "20120507",
167	.major			= 1,
168	.minor			= 0,
169	.patchlevel		= 0,
170};
171
172static int compare_of(struct device *dev, void *data)
173{
174	struct device_node *np = data;
175
176	/* Special case for DI, dev->of_node may not be set yet */
177	if (strcmp(dev->driver->name, "imx-ipuv3-crtc") == 0) {
178		struct ipu_client_platformdata *pdata = dev->platform_data;
179
180		return pdata->of_node == np;
181	}
182
183	/* Special case for LDB, one device for two channels */
184	if (of_node_name_eq(np, "lvds-channel")) {
185		np = of_get_parent(np);
186		of_node_put(np);
187	}
188
189	return dev->of_node == np;
190}
191
192static int imx_drm_bind(struct device *dev)
193{
194	struct drm_device *drm;
195	int ret;
196
197	drm = drm_dev_alloc(&imx_drm_driver, dev);
198	if (IS_ERR(drm))
199		return PTR_ERR(drm);
200
201	/*
202	 * set max width and height as default value(4096x4096).
203	 * this value would be used to check framebuffer size limitation
204	 * at drm_mode_addfb().
205	 */
206	drm->mode_config.min_width = 1;
207	drm->mode_config.min_height = 1;
208	drm->mode_config.max_width = 4096;
209	drm->mode_config.max_height = 4096;
210	drm->mode_config.funcs = &imx_drm_mode_config_funcs;
211	drm->mode_config.helper_private = &imx_drm_mode_config_helpers;
212	drm->mode_config.normalize_zpos = true;
213
214	ret = drmm_mode_config_init(drm);
215	if (ret)
216		goto err_kms;
217
218	ret = drm_vblank_init(drm, MAX_CRTC);
219	if (ret)
220		goto err_kms;
221
222	dev_set_drvdata(dev, drm);
223
224	/* Now try and bind all our sub-components */
225	ret = component_bind_all(dev, drm);
226	if (ret)
227		goto err_kms;
228
229	drm_mode_config_reset(drm);
230
231	/*
232	 * All components are now initialised, so setup the fb helper.
233	 * The fb helper takes copies of key hardware information, so the
234	 * crtcs/connectors/encoders must not change after this point.
235	 */
236	if (legacyfb_depth != 16 && legacyfb_depth != 32) {
237		dev_warn(dev, "Invalid legacyfb_depth.  Defaulting to 16bpp\n");
238		legacyfb_depth = 16;
239	}
240
241	drm_kms_helper_poll_init(drm);
242
243	ret = drm_dev_register(drm, 0);
244	if (ret)
245		goto err_poll_fini;
246
247	drm_client_setup_with_color_mode(drm, legacyfb_depth);
248
249	return 0;
250
251err_poll_fini:
252	drm_kms_helper_poll_fini(drm);
253	component_unbind_all(drm->dev, drm);
254err_kms:
255	dev_set_drvdata(dev, NULL);
256	drm_dev_put(drm);
257
258	return ret;
259}
260
261static void imx_drm_unbind(struct device *dev)
262{
263	struct drm_device *drm = dev_get_drvdata(dev);
264
265	drm_dev_unregister(drm);
266
267	drm_kms_helper_poll_fini(drm);
268	drm_atomic_helper_shutdown(drm);
269
270	component_unbind_all(drm->dev, drm);
271
272	drm_dev_put(drm);
273
274	dev_set_drvdata(dev, NULL);
275}
276
277static const struct component_master_ops imx_drm_ops = {
278	.bind = imx_drm_bind,
279	.unbind = imx_drm_unbind,
280};
281
282static int imx_drm_platform_probe(struct platform_device *pdev)
283{
284	int ret = drm_of_component_probe(&pdev->dev, compare_of, &imx_drm_ops);
285
286	if (!ret)
287		ret = dma_set_coherent_mask(&pdev->dev, DMA_BIT_MASK(32));
288
289	return ret;
290}
291
292static void imx_drm_platform_remove(struct platform_device *pdev)
293{
294	component_master_del(&pdev->dev, &imx_drm_ops);
295}
296
297static void imx_drm_platform_shutdown(struct platform_device *pdev)
298{
299	drm_atomic_helper_shutdown(platform_get_drvdata(pdev));
300}
301
302#ifdef CONFIG_PM_SLEEP
303static int imx_drm_suspend(struct device *dev)
304{
305	struct drm_device *drm_dev = dev_get_drvdata(dev);
306
307	return drm_mode_config_helper_suspend(drm_dev);
308}
309
310static int imx_drm_resume(struct device *dev)
311{
312	struct drm_device *drm_dev = dev_get_drvdata(dev);
313
314	return drm_mode_config_helper_resume(drm_dev);
315}
316#endif
317
318static SIMPLE_DEV_PM_OPS(imx_drm_pm_ops, imx_drm_suspend, imx_drm_resume);
319
320static const struct of_device_id imx_drm_dt_ids[] = {
321	{ .compatible = "fsl,imx-display-subsystem", },
322	{ /* sentinel */ },
323};
324MODULE_DEVICE_TABLE(of, imx_drm_dt_ids);
325
326static struct platform_driver imx_drm_pdrv = {
327	.probe		= imx_drm_platform_probe,
328	.remove		= imx_drm_platform_remove,
329	.shutdown	= imx_drm_platform_shutdown,
330	.driver		= {
331		.name	= "imx-drm",
332		.pm	= &imx_drm_pm_ops,
333		.of_match_table = imx_drm_dt_ids,
334	},
335};
336
337static struct platform_driver * const drivers[] = {
338	&imx_drm_pdrv,
339	&ipu_drm_driver,
340};
341
342static int __init imx_drm_init(void)
343{
344	if (drm_firmware_drivers_only())
345		return -ENODEV;
346
347	return platform_register_drivers(drivers, ARRAY_SIZE(drivers));
348}
349module_init(imx_drm_init);
350
351static void __exit imx_drm_exit(void)
352{
353	platform_unregister_drivers(drivers, ARRAY_SIZE(drivers));
354}
355module_exit(imx_drm_exit);
356
357MODULE_AUTHOR("Sascha Hauer <s.hauer@pengutronix.de>");
358MODULE_DESCRIPTION("i.MX drm driver core");
359MODULE_LICENSE("GPL");