xref: /openbmc/linux/drivers/gpu/drm/sun4i/sun4i_drv.c (revision 8365a898)
1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3  * Copyright (C) 2015 Free Electrons
4  * Copyright (C) 2015 NextThing Co
5  *
6  * Maxime Ripard <maxime.ripard@free-electrons.com>
7  */
8 
9 #include <linux/component.h>
10 #include <linux/kfifo.h>
11 #include <linux/module.h>
12 #include <linux/of_graph.h>
13 #include <linux/of_reserved_mem.h>
14 #include <linux/platform_device.h>
15 
16 #include <drm/drm_atomic_helper.h>
17 #include <drm/drm_drv.h>
18 #include <drm/drm_fb_cma_helper.h>
19 #include <drm/drm_fb_helper.h>
20 #include <drm/drm_gem_cma_helper.h>
21 #include <drm/drm_of.h>
22 #include <drm/drm_probe_helper.h>
23 #include <drm/drm_vblank.h>
24 
25 #include "sun4i_drv.h"
26 #include "sun4i_frontend.h"
27 #include "sun4i_framebuffer.h"
28 #include "sun4i_tcon.h"
29 #include "sun8i_tcon_top.h"
30 
31 static int drm_sun4i_gem_dumb_create(struct drm_file *file_priv,
32 				     struct drm_device *drm,
33 				     struct drm_mode_create_dumb *args)
34 {
35 	/* The hardware only allows even pitches for YUV buffers. */
36 	args->pitch = ALIGN(DIV_ROUND_UP(args->width * args->bpp, 8), 2);
37 
38 	return drm_gem_cma_dumb_create_internal(file_priv, drm, args);
39 }
40 
41 DEFINE_DRM_GEM_CMA_FOPS(sun4i_drv_fops);
42 
43 static struct drm_driver sun4i_drv_driver = {
44 	.driver_features	= DRIVER_GEM | DRIVER_MODESET | DRIVER_ATOMIC,
45 
46 	/* Generic Operations */
47 	.fops			= &sun4i_drv_fops,
48 	.name			= "sun4i-drm",
49 	.desc			= "Allwinner sun4i Display Engine",
50 	.date			= "20150629",
51 	.major			= 1,
52 	.minor			= 0,
53 
54 	/* GEM Operations */
55 	DRM_GEM_CMA_VMAP_DRIVER_OPS,
56 	.dumb_create		= drm_sun4i_gem_dumb_create,
57 };
58 
59 static int sun4i_drv_bind(struct device *dev)
60 {
61 	struct drm_device *drm;
62 	struct sun4i_drv *drv;
63 	int ret;
64 
65 	drm = drm_dev_alloc(&sun4i_drv_driver, dev);
66 	if (IS_ERR(drm))
67 		return PTR_ERR(drm);
68 
69 	drv = devm_kzalloc(dev, sizeof(*drv), GFP_KERNEL);
70 	if (!drv) {
71 		ret = -ENOMEM;
72 		goto free_drm;
73 	}
74 
75 	dev_set_drvdata(dev, drm);
76 	drm->dev_private = drv;
77 	INIT_LIST_HEAD(&drv->frontend_list);
78 	INIT_LIST_HEAD(&drv->engine_list);
79 	INIT_LIST_HEAD(&drv->tcon_list);
80 
81 	ret = of_reserved_mem_device_init(dev);
82 	if (ret && ret != -ENODEV) {
83 		dev_err(drm->dev, "Couldn't claim our memory region\n");
84 		goto free_drm;
85 	}
86 
87 	drm_mode_config_init(drm);
88 
89 	ret = component_bind_all(drm->dev, drm);
90 	if (ret) {
91 		dev_err(drm->dev, "Couldn't bind all pipelines components\n");
92 		goto cleanup_mode_config;
93 	}
94 
95 	/* drm_vblank_init calls kcalloc, which can fail */
96 	ret = drm_vblank_init(drm, drm->mode_config.num_crtc);
97 	if (ret)
98 		goto cleanup_mode_config;
99 
100 	drm->irq_enabled = true;
101 
102 	/* Remove early framebuffers (ie. simplefb) */
103 	drm_fb_helper_remove_conflicting_framebuffers(NULL, "sun4i-drm-fb", false);
104 
105 	sun4i_framebuffer_init(drm);
106 
107 	/* Enable connectors polling */
108 	drm_kms_helper_poll_init(drm);
109 
110 	ret = drm_dev_register(drm, 0);
111 	if (ret)
112 		goto finish_poll;
113 
114 	drm_fbdev_generic_setup(drm, 32);
115 
116 	return 0;
117 
118 finish_poll:
119 	drm_kms_helper_poll_fini(drm);
120 cleanup_mode_config:
121 	drm_mode_config_cleanup(drm);
122 	of_reserved_mem_device_release(dev);
123 free_drm:
124 	drm_dev_put(drm);
125 	return ret;
126 }
127 
128 static void sun4i_drv_unbind(struct device *dev)
129 {
130 	struct drm_device *drm = dev_get_drvdata(dev);
131 
132 	drm_dev_unregister(drm);
133 	drm_kms_helper_poll_fini(drm);
134 	drm_atomic_helper_shutdown(drm);
135 	drm_mode_config_cleanup(drm);
136 
137 	component_unbind_all(dev, NULL);
138 	of_reserved_mem_device_release(dev);
139 
140 	drm_dev_put(drm);
141 }
142 
143 static const struct component_master_ops sun4i_drv_master_ops = {
144 	.bind	= sun4i_drv_bind,
145 	.unbind	= sun4i_drv_unbind,
146 };
147 
148 static bool sun4i_drv_node_is_connector(struct device_node *node)
149 {
150 	return of_device_is_compatible(node, "hdmi-connector");
151 }
152 
153 static bool sun4i_drv_node_is_frontend(struct device_node *node)
154 {
155 	return of_device_is_compatible(node, "allwinner,sun4i-a10-display-frontend") ||
156 		of_device_is_compatible(node, "allwinner,sun5i-a13-display-frontend") ||
157 		of_device_is_compatible(node, "allwinner,sun6i-a31-display-frontend") ||
158 		of_device_is_compatible(node, "allwinner,sun7i-a20-display-frontend") ||
159 		of_device_is_compatible(node, "allwinner,sun8i-a23-display-frontend") ||
160 		of_device_is_compatible(node, "allwinner,sun8i-a33-display-frontend") ||
161 		of_device_is_compatible(node, "allwinner,sun9i-a80-display-frontend");
162 }
163 
164 static bool sun4i_drv_node_is_deu(struct device_node *node)
165 {
166 	return of_device_is_compatible(node, "allwinner,sun9i-a80-deu");
167 }
168 
169 static bool sun4i_drv_node_is_supported_frontend(struct device_node *node)
170 {
171 	if (IS_ENABLED(CONFIG_DRM_SUN4I_BACKEND))
172 		return !!of_match_node(sun4i_frontend_of_table, node);
173 
174 	return false;
175 }
176 
177 static bool sun4i_drv_node_is_tcon(struct device_node *node)
178 {
179 	return !!of_match_node(sun4i_tcon_of_table, node);
180 }
181 
182 static bool sun4i_drv_node_is_tcon_with_ch0(struct device_node *node)
183 {
184 	const struct of_device_id *match;
185 
186 	match = of_match_node(sun4i_tcon_of_table, node);
187 	if (match) {
188 		struct sun4i_tcon_quirks *quirks;
189 
190 		quirks = (struct sun4i_tcon_quirks *)match->data;
191 
192 		return quirks->has_channel_0;
193 	}
194 
195 	return false;
196 }
197 
198 static bool sun4i_drv_node_is_tcon_top(struct device_node *node)
199 {
200 	return IS_ENABLED(CONFIG_DRM_SUN8I_TCON_TOP) &&
201 		!!of_match_node(sun8i_tcon_top_of_table, node);
202 }
203 
204 static int compare_of(struct device *dev, void *data)
205 {
206 	DRM_DEBUG_DRIVER("Comparing of node %pOF with %pOF\n",
207 			 dev->of_node,
208 			 data);
209 
210 	return dev->of_node == data;
211 }
212 
213 /*
214  * The encoder drivers use drm_of_find_possible_crtcs to get upstream
215  * crtcs from the device tree using of_graph. For the results to be
216  * correct, encoders must be probed/bound after _all_ crtcs have been
217  * created. The existing code uses a depth first recursive traversal
218  * of the of_graph, which means the encoders downstream of the TCON
219  * get add right after the first TCON. The second TCON or CRTC will
220  * never be properly associated with encoders connected to it.
221  *
222  * Also, in a dual display pipeline setup, both frontends can feed
223  * either backend, and both backends can feed either TCON, we want
224  * all components of the same type to be added before the next type
225  * in the pipeline. Fortunately, the pipelines are perfectly symmetric,
226  * i.e. components of the same type are at the same depth when counted
227  * from the frontend. The only exception is the third pipeline in
228  * the A80 SoC, which we do not support anyway.
229  *
230  * Hence we can use a breadth first search traversal order to add
231  * components. We do not need to check for duplicates. The component
232  * matching system handles this for us.
233  */
234 struct endpoint_list {
235 	DECLARE_KFIFO(fifo, struct device_node *, 16);
236 };
237 
238 static void sun4i_drv_traverse_endpoints(struct endpoint_list *list,
239 					 struct device_node *node,
240 					 int port_id)
241 {
242 	struct device_node *ep, *remote, *port;
243 
244 	port = of_graph_get_port_by_id(node, port_id);
245 	if (!port) {
246 		DRM_DEBUG_DRIVER("No output to bind on port %d\n", port_id);
247 		return;
248 	}
249 
250 	for_each_available_child_of_node(port, ep) {
251 		remote = of_graph_get_remote_port_parent(ep);
252 		if (!remote) {
253 			DRM_DEBUG_DRIVER("Error retrieving the output node\n");
254 			continue;
255 		}
256 
257 		if (sun4i_drv_node_is_tcon(node)) {
258 			/*
259 			 * TCON TOP is always probed before TCON. However, TCON
260 			 * points back to TCON TOP when it is source for HDMI.
261 			 * We have to skip it here to prevent infinite looping
262 			 * between TCON TOP and TCON.
263 			 */
264 			if (sun4i_drv_node_is_tcon_top(remote)) {
265 				DRM_DEBUG_DRIVER("TCON output endpoint is TCON TOP... skipping\n");
266 				of_node_put(remote);
267 				continue;
268 			}
269 
270 			/*
271 			 * If the node is our TCON with channel 0, the first
272 			 * port is used for panel or bridges, and will not be
273 			 * part of the component framework.
274 			 */
275 			if (sun4i_drv_node_is_tcon_with_ch0(node)) {
276 				struct of_endpoint endpoint;
277 
278 				if (of_graph_parse_endpoint(ep, &endpoint)) {
279 					DRM_DEBUG_DRIVER("Couldn't parse endpoint\n");
280 					of_node_put(remote);
281 					continue;
282 				}
283 
284 				if (!endpoint.id) {
285 					DRM_DEBUG_DRIVER("Endpoint is our panel... skipping\n");
286 					of_node_put(remote);
287 					continue;
288 				}
289 			}
290 		}
291 
292 		kfifo_put(&list->fifo, remote);
293 	}
294 }
295 
296 static int sun4i_drv_add_endpoints(struct device *dev,
297 				   struct endpoint_list *list,
298 				   struct component_match **match,
299 				   struct device_node *node)
300 {
301 	int count = 0;
302 
303 	/*
304 	 * The frontend has been disabled in some of our old device
305 	 * trees. If we find a node that is the frontend and is
306 	 * disabled, we should just follow through and parse its
307 	 * child, but without adding it to the component list.
308 	 * Otherwise, we obviously want to add it to the list.
309 	 */
310 	if (!sun4i_drv_node_is_frontend(node) &&
311 	    !of_device_is_available(node))
312 		return 0;
313 
314 	/*
315 	 * The connectors will be the last nodes in our pipeline, we
316 	 * can just bail out.
317 	 */
318 	if (sun4i_drv_node_is_connector(node))
319 		return 0;
320 
321 	/*
322 	 * If the device is either just a regular device, or an
323 	 * enabled frontend supported by the driver, we add it to our
324 	 * component list.
325 	 */
326 	if (!(sun4i_drv_node_is_frontend(node) ||
327 	      sun4i_drv_node_is_deu(node)) ||
328 	    (sun4i_drv_node_is_supported_frontend(node) &&
329 	     of_device_is_available(node))) {
330 		/* Add current component */
331 		DRM_DEBUG_DRIVER("Adding component %pOF\n", node);
332 		drm_of_component_match_add(dev, match, compare_of, node);
333 		count++;
334 	}
335 
336 	/* each node has at least one output */
337 	sun4i_drv_traverse_endpoints(list, node, 1);
338 
339 	/* TCON TOP has second and third output */
340 	if (sun4i_drv_node_is_tcon_top(node)) {
341 		sun4i_drv_traverse_endpoints(list, node, 3);
342 		sun4i_drv_traverse_endpoints(list, node, 5);
343 	}
344 
345 	return count;
346 }
347 
348 #ifdef CONFIG_PM_SLEEP
349 static int sun4i_drv_drm_sys_suspend(struct device *dev)
350 {
351 	struct drm_device *drm = dev_get_drvdata(dev);
352 
353 	return drm_mode_config_helper_suspend(drm);
354 }
355 
356 static int sun4i_drv_drm_sys_resume(struct device *dev)
357 {
358 	struct drm_device *drm = dev_get_drvdata(dev);
359 
360 	return drm_mode_config_helper_resume(drm);
361 }
362 #endif
363 
364 static const struct dev_pm_ops sun4i_drv_drm_pm_ops = {
365 	SET_SYSTEM_SLEEP_PM_OPS(sun4i_drv_drm_sys_suspend,
366 				sun4i_drv_drm_sys_resume)
367 };
368 
369 static int sun4i_drv_probe(struct platform_device *pdev)
370 {
371 	struct component_match *match = NULL;
372 	struct device_node *np = pdev->dev.of_node, *endpoint;
373 	struct endpoint_list list;
374 	int i, ret, count = 0;
375 
376 	INIT_KFIFO(list.fifo);
377 
378 	for (i = 0;; i++) {
379 		struct device_node *pipeline = of_parse_phandle(np,
380 								"allwinner,pipelines",
381 								i);
382 		if (!pipeline)
383 			break;
384 
385 		kfifo_put(&list.fifo, pipeline);
386 	}
387 
388 	while (kfifo_get(&list.fifo, &endpoint)) {
389 		/* process this endpoint */
390 		ret = sun4i_drv_add_endpoints(&pdev->dev, &list, &match,
391 					      endpoint);
392 
393 		/* sun4i_drv_add_endpoints can fail to allocate memory */
394 		if (ret < 0)
395 			return ret;
396 
397 		count += ret;
398 	}
399 
400 	if (count)
401 		return component_master_add_with_match(&pdev->dev,
402 						       &sun4i_drv_master_ops,
403 						       match);
404 	else
405 		return 0;
406 }
407 
408 static int sun4i_drv_remove(struct platform_device *pdev)
409 {
410 	component_master_del(&pdev->dev, &sun4i_drv_master_ops);
411 
412 	return 0;
413 }
414 
415 static const struct of_device_id sun4i_drv_of_table[] = {
416 	{ .compatible = "allwinner,sun4i-a10-display-engine" },
417 	{ .compatible = "allwinner,sun5i-a10s-display-engine" },
418 	{ .compatible = "allwinner,sun5i-a13-display-engine" },
419 	{ .compatible = "allwinner,sun6i-a31-display-engine" },
420 	{ .compatible = "allwinner,sun6i-a31s-display-engine" },
421 	{ .compatible = "allwinner,sun7i-a20-display-engine" },
422 	{ .compatible = "allwinner,sun8i-a23-display-engine" },
423 	{ .compatible = "allwinner,sun8i-a33-display-engine" },
424 	{ .compatible = "allwinner,sun8i-a83t-display-engine" },
425 	{ .compatible = "allwinner,sun8i-h3-display-engine" },
426 	{ .compatible = "allwinner,sun8i-r40-display-engine" },
427 	{ .compatible = "allwinner,sun8i-v3s-display-engine" },
428 	{ .compatible = "allwinner,sun9i-a80-display-engine" },
429 	{ .compatible = "allwinner,sun50i-a64-display-engine" },
430 	{ .compatible = "allwinner,sun50i-h6-display-engine" },
431 	{ }
432 };
433 MODULE_DEVICE_TABLE(of, sun4i_drv_of_table);
434 
435 static struct platform_driver sun4i_drv_platform_driver = {
436 	.probe		= sun4i_drv_probe,
437 	.remove		= sun4i_drv_remove,
438 	.driver		= {
439 		.name		= "sun4i-drm",
440 		.of_match_table	= sun4i_drv_of_table,
441 		.pm = &sun4i_drv_drm_pm_ops,
442 	},
443 };
444 module_platform_driver(sun4i_drv_platform_driver);
445 
446 MODULE_AUTHOR("Boris Brezillon <boris.brezillon@free-electrons.com>");
447 MODULE_AUTHOR("Maxime Ripard <maxime.ripard@free-electrons.com>");
448 MODULE_DESCRIPTION("Allwinner A10 Display Engine DRM/KMS Driver");
449 MODULE_LICENSE("GPL");
450