imx-drm-core.c

  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
 35static int legacyfb_depth = 16;
 36module_param(legacyfb_depth, int, 0444);
 37
 38DEFINE_DRM_GEM_DMA_FOPS(imx_drm_driver_fops);
 39
 40static 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
 65static 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
 71static 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
110static const struct drm_mode_config_helper_funcs imx_drm_mode_config_helpers = {
111	.atomic_commit_tail = imx_drm_atomic_commit_tail,
112};
113
114
115int 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}
136EXPORT_SYMBOL_GPL(imx_drm_encoder_parse_of);
137
138static const struct drm_ioctl_desc imx_drm_ioctls[] = {
139	/* none so far */
140};
141
142static 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
176static 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
190static 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
210static 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
269err_poll_fini:
270	drm_kms_helper_poll_fini(drm);
271	component_unbind_all(drm->dev, drm);
272err_kms:
273	dev_set_drvdata(dev, NULL);
274	drm_dev_put(drm);
275
276	return ret;
277}
278
279static 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
295static const struct component_master_ops imx_drm_ops = {
296	.bind = imx_drm_bind,
297	.unbind = imx_drm_unbind,
298};
299
300static 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
310static void imx_drm_platform_remove(struct platform_device *pdev)
311{
312	component_master_del(&pdev->dev, &imx_drm_ops);
313}
314
315static 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
321static 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
328static 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
336static SIMPLE_DEV_PM_OPS(imx_drm_pm_ops, imx_drm_suspend, imx_drm_resume);
337
338static const struct of_device_id imx_drm_dt_ids[] = {
339	{ .compatible = "fsl,imx-display-subsystem", },
340	{ /* sentinel */ },
341};
342MODULE_DEVICE_TABLE(of, imx_drm_dt_ids);
343
344static 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
355static struct platform_driver * const drivers[] = {
356	&imx_drm_pdrv,
357	&ipu_drm_driver,
358};
359
360static 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}
367module_init(imx_drm_init);
368
369static void __exit imx_drm_exit(void)
370{
371	platform_unregister_drivers(drivers, ARRAY_SIZE(drivers));
372}
373module_exit(imx_drm_exit);
374
375MODULE_AUTHOR("Sascha Hauer <s.hauer@pengutronix.de>");
376MODULE_DESCRIPTION("i.MX drm driver core");
377MODULE_LICENSE("GPL");