2 * Freescale i.MX drm driver
4 * Copyright (C) 2011 Sascha Hauer, Pengutronix
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public License
8 * as published by the Free Software Foundation; either version 2
9 * of the License, or (at your option) any later version.
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
16 #include <linux/component.h>
17 #include <linux/device.h>
18 #include <linux/dma-buf.h>
19 #include <linux/module.h>
20 #include <linux/platform_device.h>
22 #include <drm/drm_atomic.h>
23 #include <drm/drm_atomic_helper.h>
24 #include <drm/drm_fb_helper.h>
25 #include <drm/drm_crtc_helper.h>
26 #include <drm/drm_gem_cma_helper.h>
27 #include <drm/drm_fb_cma_helper.h>
28 #include <drm/drm_plane_helper.h>
29 #include <drm/drm_of.h>
30 #include <video/imx-ipu-v3.h>
33 #include "ipuv3-plane.h"
37 struct imx_drm_device {
38 struct drm_device *drm;
40 struct drm_fbdev_cma *fbhelper;
41 struct drm_atomic_state *state;
44 #if IS_ENABLED(CONFIG_DRM_FBDEV_EMULATION)
45 static int legacyfb_depth = 16;
46 module_param(legacyfb_depth, int, 0444);
49 static void imx_drm_driver_lastclose(struct drm_device *drm)
51 struct imx_drm_device *imxdrm = drm->dev_private;
53 drm_fbdev_cma_restore_mode(imxdrm->fbhelper);
56 DEFINE_DRM_GEM_CMA_FOPS(imx_drm_driver_fops);
58 void imx_drm_connector_destroy(struct drm_connector *connector)
60 drm_connector_unregister(connector);
61 drm_connector_cleanup(connector);
63 EXPORT_SYMBOL_GPL(imx_drm_connector_destroy);
65 void imx_drm_encoder_destroy(struct drm_encoder *encoder)
67 drm_encoder_cleanup(encoder);
69 EXPORT_SYMBOL_GPL(imx_drm_encoder_destroy);
71 static void imx_drm_output_poll_changed(struct drm_device *drm)
73 struct imx_drm_device *imxdrm = drm->dev_private;
75 drm_fbdev_cma_hotplug_event(imxdrm->fbhelper);
78 static int imx_drm_atomic_check(struct drm_device *dev,
79 struct drm_atomic_state *state)
83 ret = drm_atomic_helper_check_modeset(dev, state);
87 ret = drm_atomic_helper_check_planes(dev, state);
92 * Check modeset again in case crtc_state->mode_changed is
93 * updated in plane's ->atomic_check callback.
95 ret = drm_atomic_helper_check_modeset(dev, state);
99 /* Assign PRG/PRE channels and check if all constrains are satisfied. */
100 ret = ipu_planes_assign_pre(dev, state);
107 static const struct drm_mode_config_funcs imx_drm_mode_config_funcs = {
108 .fb_create = drm_fb_cma_create,
109 .output_poll_changed = imx_drm_output_poll_changed,
110 .atomic_check = imx_drm_atomic_check,
111 .atomic_commit = drm_atomic_helper_commit,
114 static void imx_drm_atomic_commit_tail(struct drm_atomic_state *state)
116 struct drm_device *dev = state->dev;
117 struct drm_plane *plane;
118 struct drm_plane_state *old_plane_state, *new_plane_state;
119 bool plane_disabling = false;
122 drm_atomic_helper_commit_modeset_disables(dev, state);
124 drm_atomic_helper_commit_planes(dev, state,
125 DRM_PLANE_COMMIT_ACTIVE_ONLY |
126 DRM_PLANE_COMMIT_NO_DISABLE_AFTER_MODESET);
128 drm_atomic_helper_commit_modeset_enables(dev, state);
130 for_each_oldnew_plane_in_state(state, plane, old_plane_state, new_plane_state, i) {
131 if (drm_atomic_plane_disabling(old_plane_state, new_plane_state))
132 plane_disabling = true;
135 if (plane_disabling) {
136 drm_atomic_helper_wait_for_vblanks(dev, state);
138 for_each_old_plane_in_state(state, plane, old_plane_state, i)
139 ipu_plane_disable_deferred(plane);
143 drm_atomic_helper_commit_hw_done(state);
146 static const struct drm_mode_config_helper_funcs imx_drm_mode_config_helpers = {
147 .atomic_commit_tail = imx_drm_atomic_commit_tail,
151 int imx_drm_encoder_parse_of(struct drm_device *drm,
152 struct drm_encoder *encoder, struct device_node *np)
154 uint32_t crtc_mask = drm_of_find_possible_crtcs(drm, np);
157 * If we failed to find the CRTC(s) which this encoder is
158 * supposed to be connected to, it's because the CRTC has
159 * not been registered yet. Defer probing, and hope that
160 * the required CRTC is added later.
163 return -EPROBE_DEFER;
165 encoder->possible_crtcs = crtc_mask;
167 /* FIXME: this is the mask of outputs which can clone this output. */
168 encoder->possible_clones = ~0;
172 EXPORT_SYMBOL_GPL(imx_drm_encoder_parse_of);
174 static const struct drm_ioctl_desc imx_drm_ioctls[] = {
178 static struct drm_driver imx_drm_driver = {
179 .driver_features = DRIVER_MODESET | DRIVER_GEM | DRIVER_PRIME |
181 .lastclose = imx_drm_driver_lastclose,
182 .gem_free_object_unlocked = drm_gem_cma_free_object,
183 .gem_vm_ops = &drm_gem_cma_vm_ops,
184 .dumb_create = drm_gem_cma_dumb_create,
186 .prime_handle_to_fd = drm_gem_prime_handle_to_fd,
187 .prime_fd_to_handle = drm_gem_prime_fd_to_handle,
188 .gem_prime_import = drm_gem_prime_import,
189 .gem_prime_export = drm_gem_prime_export,
190 .gem_prime_get_sg_table = drm_gem_cma_prime_get_sg_table,
191 .gem_prime_import_sg_table = drm_gem_cma_prime_import_sg_table,
192 .gem_prime_vmap = drm_gem_cma_prime_vmap,
193 .gem_prime_vunmap = drm_gem_cma_prime_vunmap,
194 .gem_prime_mmap = drm_gem_cma_prime_mmap,
195 .ioctls = imx_drm_ioctls,
196 .num_ioctls = ARRAY_SIZE(imx_drm_ioctls),
197 .fops = &imx_drm_driver_fops,
199 .desc = "i.MX DRM graphics",
206 static int compare_of(struct device *dev, void *data)
208 struct device_node *np = data;
210 /* Special case for DI, dev->of_node may not be set yet */
211 if (strcmp(dev->driver->name, "imx-ipuv3-crtc") == 0) {
212 struct ipu_client_platformdata *pdata = dev->platform_data;
214 return pdata->of_node == np;
217 /* Special case for LDB, one device for two channels */
218 if (of_node_cmp(np->name, "lvds-channel") == 0) {
219 np = of_get_parent(np);
223 return dev->of_node == np;
226 static int imx_drm_bind(struct device *dev)
228 struct drm_device *drm;
229 struct imx_drm_device *imxdrm;
232 drm = drm_dev_alloc(&imx_drm_driver, dev);
236 imxdrm = devm_kzalloc(dev, sizeof(*imxdrm), GFP_KERNEL);
243 drm->dev_private = imxdrm;
246 * enable drm irq mode.
247 * - with irq_enabled = true, we can use the vblank feature.
249 * P.S. note that we wouldn't use drm irq handler but
250 * just specific driver own one instead because
251 * drm framework supports only one irq handler and
252 * drivers can well take care of their interrupts
254 drm->irq_enabled = true;
257 * set max width and height as default value(4096x4096).
258 * this value would be used to check framebuffer size limitation
259 * at drm_mode_addfb().
261 drm->mode_config.min_width = 1;
262 drm->mode_config.min_height = 1;
263 drm->mode_config.max_width = 4096;
264 drm->mode_config.max_height = 4096;
265 drm->mode_config.funcs = &imx_drm_mode_config_funcs;
266 drm->mode_config.helper_private = &imx_drm_mode_config_helpers;
268 drm_mode_config_init(drm);
270 ret = drm_vblank_init(drm, MAX_CRTC);
274 dev_set_drvdata(dev, drm);
276 /* Now try and bind all our sub-components */
277 ret = component_bind_all(dev, drm);
281 drm_mode_config_reset(drm);
284 * All components are now initialised, so setup the fb helper.
285 * The fb helper takes copies of key hardware information, so the
286 * crtcs/connectors/encoders must not change after this point.
288 #if IS_ENABLED(CONFIG_DRM_FBDEV_EMULATION)
289 if (legacyfb_depth != 16 && legacyfb_depth != 32) {
290 dev_warn(dev, "Invalid legacyfb_depth. Defaulting to 16bpp\n");
293 imxdrm->fbhelper = drm_fbdev_cma_init(drm, legacyfb_depth, MAX_CRTC);
294 if (IS_ERR(imxdrm->fbhelper)) {
295 ret = PTR_ERR(imxdrm->fbhelper);
296 imxdrm->fbhelper = NULL;
301 drm_kms_helper_poll_init(drm);
303 ret = drm_dev_register(drm, 0);
310 drm_kms_helper_poll_fini(drm);
311 #if IS_ENABLED(CONFIG_DRM_FBDEV_EMULATION)
312 if (imxdrm->fbhelper)
313 drm_fbdev_cma_fini(imxdrm->fbhelper);
316 component_unbind_all(drm->dev, drm);
318 drm_mode_config_cleanup(drm);
325 static void imx_drm_unbind(struct device *dev)
327 struct drm_device *drm = dev_get_drvdata(dev);
328 struct imx_drm_device *imxdrm = drm->dev_private;
330 drm_dev_unregister(drm);
332 drm_kms_helper_poll_fini(drm);
334 if (imxdrm->fbhelper)
335 drm_fbdev_cma_fini(imxdrm->fbhelper);
337 drm_mode_config_cleanup(drm);
339 component_unbind_all(drm->dev, drm);
340 dev_set_drvdata(dev, NULL);
345 static const struct component_master_ops imx_drm_ops = {
346 .bind = imx_drm_bind,
347 .unbind = imx_drm_unbind,
350 static int imx_drm_platform_probe(struct platform_device *pdev)
352 int ret = drm_of_component_probe(&pdev->dev, compare_of, &imx_drm_ops);
355 ret = dma_set_coherent_mask(&pdev->dev, DMA_BIT_MASK(32));
360 static int imx_drm_platform_remove(struct platform_device *pdev)
362 component_master_del(&pdev->dev, &imx_drm_ops);
366 #ifdef CONFIG_PM_SLEEP
367 static int imx_drm_suspend(struct device *dev)
369 struct drm_device *drm_dev = dev_get_drvdata(dev);
370 struct imx_drm_device *imxdrm;
372 /* The drm_dev is NULL before .load hook is called */
376 drm_kms_helper_poll_disable(drm_dev);
378 imxdrm = drm_dev->dev_private;
379 imxdrm->state = drm_atomic_helper_suspend(drm_dev);
380 if (IS_ERR(imxdrm->state)) {
381 drm_kms_helper_poll_enable(drm_dev);
382 return PTR_ERR(imxdrm->state);
388 static int imx_drm_resume(struct device *dev)
390 struct drm_device *drm_dev = dev_get_drvdata(dev);
391 struct imx_drm_device *imx_drm;
396 imx_drm = drm_dev->dev_private;
397 drm_atomic_helper_resume(drm_dev, imx_drm->state);
398 drm_kms_helper_poll_enable(drm_dev);
404 static SIMPLE_DEV_PM_OPS(imx_drm_pm_ops, imx_drm_suspend, imx_drm_resume);
406 static const struct of_device_id imx_drm_dt_ids[] = {
407 { .compatible = "fsl,imx-display-subsystem", },
410 MODULE_DEVICE_TABLE(of, imx_drm_dt_ids);
412 static struct platform_driver imx_drm_pdrv = {
413 .probe = imx_drm_platform_probe,
414 .remove = imx_drm_platform_remove,
417 .pm = &imx_drm_pm_ops,
418 .of_match_table = imx_drm_dt_ids,
422 static struct platform_driver * const drivers[] = {
427 static int __init imx_drm_init(void)
429 return platform_register_drivers(drivers, ARRAY_SIZE(drivers));
431 module_init(imx_drm_init);
433 static void __exit imx_drm_exit(void)
435 platform_unregister_drivers(drivers, ARRAY_SIZE(drivers));
437 module_exit(imx_drm_exit);
439 MODULE_AUTHOR("Sascha Hauer <s.hauer@pengutronix.de>");
440 MODULE_DESCRIPTION("i.MX drm driver core");
441 MODULE_LICENSE("GPL");