xref: /linux/drivers/gpu/drm/imx/ipuv3/imx-drm-core.c (revision 2c1ed907520c50326b8f604907a8478b27881a2e)
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_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 
33 static int legacyfb_depth = 16;
34 module_param(legacyfb_depth, int, 0444);
35 
36 DEFINE_DRM_GEM_DMA_FOPS(imx_drm_driver_fops);
37 
imx_drm_atomic_check(struct drm_device * dev,struct drm_atomic_state * state)38 static 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 
63 static 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 
imx_drm_atomic_commit_tail(struct drm_atomic_state * state)69 static 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 
108 static const struct drm_mode_config_helper_funcs imx_drm_mode_config_helpers = {
109 	.atomic_commit_tail = imx_drm_atomic_commit_tail,
110 };
111 
112 
imx_drm_encoder_parse_of(struct drm_device * drm,struct drm_encoder * encoder,struct device_node * np)113 int 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 }
134 EXPORT_SYMBOL_GPL(imx_drm_encoder_parse_of);
135 
136 static const struct drm_ioctl_desc imx_drm_ioctls[] = {
137 	/* none so far */
138 };
139 
imx_drm_dumb_create(struct drm_file * file_priv,struct drm_device * drm,struct drm_mode_create_dumb * args)140 static 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 
157 static 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 	.major			= 1,
167 	.minor			= 0,
168 	.patchlevel		= 0,
169 };
170 
compare_of(struct device * dev,void * data)171 static int compare_of(struct device *dev, void *data)
172 {
173 	struct device_node *np = data;
174 
175 	/* Special case for DI, dev->of_node may not be set yet */
176 	if (strcmp(dev->driver->name, "imx-ipuv3-crtc") == 0) {
177 		struct ipu_client_platformdata *pdata = dev->platform_data;
178 
179 		return pdata->of_node == np;
180 	}
181 
182 	/* Special case for LDB, one device for two channels */
183 	if (of_node_name_eq(np, "lvds-channel")) {
184 		np = of_get_parent(np);
185 		of_node_put(np);
186 	}
187 
188 	return dev->of_node == np;
189 }
190 
imx_drm_bind(struct device * dev)191 static int imx_drm_bind(struct device *dev)
192 {
193 	struct drm_device *drm;
194 	int ret;
195 
196 	drm = drm_dev_alloc(&imx_drm_driver, dev);
197 	if (IS_ERR(drm))
198 		return PTR_ERR(drm);
199 
200 	/*
201 	 * set max width and height as default value(4096x4096).
202 	 * this value would be used to check framebuffer size limitation
203 	 * at drm_mode_addfb().
204 	 */
205 	drm->mode_config.min_width = 1;
206 	drm->mode_config.min_height = 1;
207 	drm->mode_config.max_width = 4096;
208 	drm->mode_config.max_height = 4096;
209 	drm->mode_config.funcs = &imx_drm_mode_config_funcs;
210 	drm->mode_config.helper_private = &imx_drm_mode_config_helpers;
211 	drm->mode_config.normalize_zpos = true;
212 
213 	ret = drmm_mode_config_init(drm);
214 	if (ret)
215 		goto err_kms;
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_client_setup_with_color_mode(drm, legacyfb_depth);
247 
248 	return 0;
249 
250 err_poll_fini:
251 	drm_kms_helper_poll_fini(drm);
252 	component_unbind_all(drm->dev, drm);
253 err_kms:
254 	dev_set_drvdata(dev, NULL);
255 	drm_dev_put(drm);
256 
257 	return ret;
258 }
259 
imx_drm_unbind(struct device * dev)260 static 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 	drm_atomic_helper_shutdown(drm);
268 
269 	component_unbind_all(drm->dev, drm);
270 
271 	drm_dev_put(drm);
272 
273 	dev_set_drvdata(dev, NULL);
274 }
275 
276 static const struct component_master_ops imx_drm_ops = {
277 	.bind = imx_drm_bind,
278 	.unbind = imx_drm_unbind,
279 };
280 
imx_drm_platform_probe(struct platform_device * pdev)281 static int imx_drm_platform_probe(struct platform_device *pdev)
282 {
283 	int ret = drm_of_component_probe(&pdev->dev, compare_of, &imx_drm_ops);
284 
285 	if (!ret)
286 		ret = dma_set_coherent_mask(&pdev->dev, DMA_BIT_MASK(32));
287 
288 	return ret;
289 }
290 
imx_drm_platform_remove(struct platform_device * pdev)291 static void imx_drm_platform_remove(struct platform_device *pdev)
292 {
293 	component_master_del(&pdev->dev, &imx_drm_ops);
294 }
295 
imx_drm_platform_shutdown(struct platform_device * pdev)296 static void imx_drm_platform_shutdown(struct platform_device *pdev)
297 {
298 	drm_atomic_helper_shutdown(platform_get_drvdata(pdev));
299 }
300 
301 #ifdef CONFIG_PM_SLEEP
imx_drm_suspend(struct device * dev)302 static 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 
imx_drm_resume(struct device * dev)309 static 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 
317 static SIMPLE_DEV_PM_OPS(imx_drm_pm_ops, imx_drm_suspend, imx_drm_resume);
318 
319 static const struct of_device_id imx_drm_dt_ids[] = {
320 	{ .compatible = "fsl,imx-display-subsystem", },
321 	{ /* sentinel */ },
322 };
323 MODULE_DEVICE_TABLE(of, imx_drm_dt_ids);
324 
325 static struct platform_driver imx_drm_pdrv = {
326 	.probe		= imx_drm_platform_probe,
327 	.remove		= imx_drm_platform_remove,
328 	.shutdown	= imx_drm_platform_shutdown,
329 	.driver		= {
330 		.name	= "imx-drm",
331 		.pm	= &imx_drm_pm_ops,
332 		.of_match_table = imx_drm_dt_ids,
333 	},
334 };
335 
336 static struct platform_driver * const drivers[] = {
337 	&imx_drm_pdrv,
338 	&ipu_drm_driver,
339 };
340 
imx_drm_init(void)341 static int __init imx_drm_init(void)
342 {
343 	if (drm_firmware_drivers_only())
344 		return -ENODEV;
345 
346 	return platform_register_drivers(drivers, ARRAY_SIZE(drivers));
347 }
348 module_init(imx_drm_init);
349 
imx_drm_exit(void)350 static void __exit imx_drm_exit(void)
351 {
352 	platform_unregister_drivers(drivers, ARRAY_SIZE(drivers));
353 }
354 module_exit(imx_drm_exit);
355 
356 MODULE_AUTHOR("Sascha Hauer <s.hauer@pengutronix.de>");
357 MODULE_DESCRIPTION("i.MX drm driver core");
358 MODULE_LICENSE("GPL");
359