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_fb_cma_helper.h>
 20#include <drm/drm_fb_helper.h>
 21#include <drm/drm_gem_cma_helper.h>
 22#include <drm/drm_gem_framebuffer_helper.h>
 23#include <drm/drm_of.h>
 24#include <drm/drm_plane_helper.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_CMA_FOPS(imx_drm_driver_fops);
 37
 38void imx_drm_connector_destroy(struct drm_connector *connector)
 39{
 40	drm_connector_unregister(connector);
 41	drm_connector_cleanup(connector);
 42}
 43EXPORT_SYMBOL_GPL(imx_drm_connector_destroy);
 44
 45static int imx_drm_atomic_check(struct drm_device *dev,
 46				struct drm_atomic_state *state)
 47{
 48	int ret;
 49
 50	ret = drm_atomic_helper_check(dev, state);
 51	if (ret)
 52		return ret;
 53
 54	/*
 55	 * Check modeset again in case crtc_state->mode_changed is
 56	 * updated in plane's ->atomic_check callback.
 57	 */
 58	ret = drm_atomic_helper_check_modeset(dev, state);
 59	if (ret)
 60		return ret;
 61
 62	/* Assign PRG/PRE channels and check if all constrains are satisfied. */
 63	ret = ipu_planes_assign_pre(dev, state);
 64	if (ret)
 65		return ret;
 66
 67	return ret;
 68}
 69
 70static const struct drm_mode_config_funcs imx_drm_mode_config_funcs = {
 71	.fb_create = drm_gem_fb_create,
 72	.atomic_check = imx_drm_atomic_check,
 73	.atomic_commit = drm_atomic_helper_commit,
 74};
 75
 76static void imx_drm_atomic_commit_tail(struct drm_atomic_state *state)
 77{
 78	struct drm_device *dev = state->dev;
 79	struct drm_plane *plane;
 80	struct drm_plane_state *old_plane_state, *new_plane_state;
 81	bool plane_disabling = false;
 82	int i;
 83
 84	drm_atomic_helper_commit_modeset_disables(dev, state);
 85
 86	drm_atomic_helper_commit_planes(dev, state,
 87				DRM_PLANE_COMMIT_ACTIVE_ONLY |
 88				DRM_PLANE_COMMIT_NO_DISABLE_AFTER_MODESET);
 89
 90	drm_atomic_helper_commit_modeset_enables(dev, state);
 91
 92	for_each_oldnew_plane_in_state(state, plane, old_plane_state, new_plane_state, i) {
 93		if (drm_atomic_plane_disabling(old_plane_state, new_plane_state))
 94			plane_disabling = true;
 95	}
 96
 97	/*
 98	 * The flip done wait is only strictly required by imx-drm if a deferred
 99	 * plane disable is in-flight. As the core requires blocking commits
100	 * to wait for the flip it is done here unconditionally. This keeps the
101	 * workitem around a bit longer than required for the majority of
102	 * non-blocking commits, but we accept that for the sake of simplicity.
103	 */
104	drm_atomic_helper_wait_for_flip_done(dev, state);
105
106	if (plane_disabling) {
107		for_each_old_plane_in_state(state, plane, old_plane_state, i)
108			ipu_plane_disable_deferred(plane);
109
110	}
111
112	drm_atomic_helper_commit_hw_done(state);
113}
114
115static const struct drm_mode_config_helper_funcs imx_drm_mode_config_helpers = {
116	.atomic_commit_tail = imx_drm_atomic_commit_tail,
117};
118
119
120int imx_drm_encoder_parse_of(struct drm_device *drm,
121	struct drm_encoder *encoder, struct device_node *np)
122{
123	uint32_t crtc_mask = drm_of_find_possible_crtcs(drm, np);
124
125	/*
126	 * If we failed to find the CRTC(s) which this encoder is
127	 * supposed to be connected to, it's because the CRTC has
128	 * not been registered yet.  Defer probing, and hope that
129	 * the required CRTC is added later.
130	 */
131	if (crtc_mask == 0)
132		return -EPROBE_DEFER;
133
134	encoder->possible_crtcs = crtc_mask;
135
136	/* FIXME: cloning support not clear, disable it all for now */
137	encoder->possible_clones = 0;
138
139	return 0;
140}
141EXPORT_SYMBOL_GPL(imx_drm_encoder_parse_of);
142
143static const struct drm_ioctl_desc imx_drm_ioctls[] = {
144	/* none so far */
145};
146
147static struct drm_driver imx_drm_driver = {
148	.driver_features	= DRIVER_MODESET | DRIVER_GEM | DRIVER_ATOMIC,
149	DRM_GEM_CMA_DRIVER_OPS,
150	.ioctls			= imx_drm_ioctls,
151	.num_ioctls		= ARRAY_SIZE(imx_drm_ioctls),
152	.fops			= &imx_drm_driver_fops,
153	.name			= "imx-drm",
154	.desc			= "i.MX DRM graphics",
155	.date			= "20120507",
156	.major			= 1,
157	.minor			= 0,
158	.patchlevel		= 0,
159};
160
161static int compare_of(struct device *dev, void *data)
162{
163	struct device_node *np = data;
164
165	/* Special case for DI, dev->of_node may not be set yet */
166	if (strcmp(dev->driver->name, "imx-ipuv3-crtc") == 0) {
167		struct ipu_client_platformdata *pdata = dev->platform_data;
168
169		return pdata->of_node == np;
170	}
171
172	/* Special case for LDB, one device for two channels */
173	if (of_node_name_eq(np, "lvds-channel")) {
174		np = of_get_parent(np);
175		of_node_put(np);
176	}
177
178	return dev->of_node == np;
179}
180
181static int imx_drm_bind(struct device *dev)
182{
183	struct drm_device *drm;
184	int ret;
185
186	drm = drm_dev_alloc(&imx_drm_driver, dev);
187	if (IS_ERR(drm))
188		return PTR_ERR(drm);
189
190	/*
191	 * enable drm irq mode.
192	 * - with irq_enabled = true, we can use the vblank feature.
193	 *
194	 * P.S. note that we wouldn't use drm irq handler but
195	 *      just specific driver own one instead because
196	 *      drm framework supports only one irq handler and
197	 *      drivers can well take care of their interrupts
198	 */
199	drm->irq_enabled = true;
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.allow_fb_modifiers = true;
213	drm->mode_config.normalize_zpos = true;
214
215	drm_mode_config_init(drm);
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_fbdev_generic_setup(drm, legacyfb_depth);
247
248	return 0;
249
250err_poll_fini:
251	drm_kms_helper_poll_fini(drm);
252	component_unbind_all(drm->dev, drm);
253err_kms:
254	drm_mode_config_cleanup(drm);
255	drm_dev_put(drm);
256
257	return ret;
258}
259
260static 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
268	component_unbind_all(drm->dev, drm);
269
270	drm_mode_config_cleanup(drm);
271
272	dev_set_drvdata(dev, NULL);
273
274	drm_dev_put(drm);
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 int imx_drm_platform_remove(struct platform_device *pdev)
293{
294	component_master_del(&pdev->dev, &imx_drm_ops);
295	return 0;
296}
297
298#ifdef CONFIG_PM_SLEEP
299static int imx_drm_suspend(struct device *dev)
300{
301	struct drm_device *drm_dev = dev_get_drvdata(dev);
302
303	return drm_mode_config_helper_suspend(drm_dev);
304}
305
306static int imx_drm_resume(struct device *dev)
307{
308	struct drm_device *drm_dev = dev_get_drvdata(dev);
309
310	return drm_mode_config_helper_resume(drm_dev);
311}
312#endif
313
314static SIMPLE_DEV_PM_OPS(imx_drm_pm_ops, imx_drm_suspend, imx_drm_resume);
315
316static const struct of_device_id imx_drm_dt_ids[] = {
317	{ .compatible = "fsl,imx-display-subsystem", },
318	{ /* sentinel */ },
319};
320MODULE_DEVICE_TABLE(of, imx_drm_dt_ids);
321
322static struct platform_driver imx_drm_pdrv = {
323	.probe		= imx_drm_platform_probe,
324	.remove		= imx_drm_platform_remove,
325	.driver		= {
326		.name	= "imx-drm",
327		.pm	= &imx_drm_pm_ops,
328		.of_match_table = imx_drm_dt_ids,
329	},
330};
331
332static struct platform_driver * const drivers[] = {
333	&imx_drm_pdrv,
334	&ipu_drm_driver,
335};
336
337static int __init imx_drm_init(void)
338{
339	return platform_register_drivers(drivers, ARRAY_SIZE(drivers));
340}
341module_init(imx_drm_init);
342
343static void __exit imx_drm_exit(void)
344{
345	platform_unregister_drivers(drivers, ARRAY_SIZE(drivers));
346}
347module_exit(imx_drm_exit);
348
349MODULE_AUTHOR("Sascha Hauer <s.hauer@pengutronix.de>");
350MODULE_DESCRIPTION("i.MX drm driver core");
351MODULE_LICENSE("GPL");