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_generic.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, 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, 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(drm, 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, "lvds-channel")) {
190		np = of_get_parent(np);
191		of_node_put(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(&imx_drm_driver, dev);
203	if (IS_ERR(drm))
204		return PTR_ERR(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(drm);
220	if (ret)
221		goto err_kms;
222
223	ret = drm_vblank_init(drm, MAX_CRTC);
224	if (ret)
225		goto err_kms;
226
227	dev_set_drvdata(dev, drm);
228
229	/* Now try and bind all our sub-components */
230	ret = component_bind_all(dev, drm);
231	if (ret)
232		goto err_kms;
233
234	drm_mode_config_reset(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(drm);
247
248	ret = drm_dev_register(drm, 0);
249	if (ret)
250		goto err_poll_fini;
251
252	drm_fbdev_generic_setup(drm, legacyfb_depth);
253
254	return 0;
255
256err_poll_fini:
257	drm_kms_helper_poll_fini(drm);
258	component_unbind_all(drm->dev, drm);
259err_kms:
260	drm_dev_put(drm);
261
262	return ret;
263}
264
265static void imx_drm_unbind(struct device *dev)
266{
267	struct drm_device *drm = dev_get_drvdata(dev);
268
269	drm_dev_unregister(drm);
270
271	drm_kms_helper_poll_fini(drm);
272
273	component_unbind_all(drm->dev, drm);
274
275	drm_dev_put(drm);
276
277	dev_set_drvdata(dev, NULL);
278}
279
280static const struct component_master_ops imx_drm_ops = {
281	.bind = imx_drm_bind,
282	.unbind = imx_drm_unbind,
283};
284
285static int imx_drm_platform_probe(struct platform_device *pdev)
286{
287	int ret = drm_of_component_probe(&pdev->dev, compare_of, &imx_drm_ops);
288
289	if (!ret)
290		ret = dma_set_coherent_mask(&pdev->dev, DMA_BIT_MASK(32));
291
292	return ret;
293}
294
295static int imx_drm_platform_remove(struct platform_device *pdev)
296{
297	component_master_del(&pdev->dev, &imx_drm_ops);
298	return 0;
299}
300
301#ifdef CONFIG_PM_SLEEP
302static 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
309static 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
317static SIMPLE_DEV_PM_OPS(imx_drm_pm_ops, imx_drm_suspend, imx_drm_resume);
318
319static const struct of_device_id imx_drm_dt_ids[] = {
320	{ .compatible = "fsl,imx-display-subsystem", },
321	{ /* sentinel */ },
322};
323MODULE_DEVICE_TABLE(of, imx_drm_dt_ids);
324
325static struct platform_driver imx_drm_pdrv = {
326	.probe		= imx_drm_platform_probe,
327	.remove		= imx_drm_platform_remove,
328	.driver		= {
329		.name	= "imx-drm",
330		.pm	= &imx_drm_pm_ops,
331		.of_match_table = imx_drm_dt_ids,
332	},
333};
334
335static struct platform_driver * const drivers[] = {
336	&imx_drm_pdrv,
337	&ipu_drm_driver,
338};
339
340static int __init imx_drm_init(void)
341{
342	if (drm_firmware_drivers_only())
343		return -ENODEV;
344
345	return platform_register_drivers(drivers, ARRAY_SIZE(drivers));
346}
347module_init(imx_drm_init);
348
349static void __exit imx_drm_exit(void)
350{
351	platform_unregister_drivers(drivers, ARRAY_SIZE(drivers));
352}
353module_exit(imx_drm_exit);
354
355MODULE_AUTHOR("Sascha Hauer <s.hauer@pengutronix.de>");
356MODULE_DESCRIPTION("i.MX drm driver core");
357MODULE_LICENSE("GPL");