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_dma.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 32 static int legacyfb_depth = 16; 33 module_param(legacyfb_depth, int, 0444); 34 35 DEFINE_DRM_GEM_DMA_FOPS(imx_drm_driver_fops); 36 37 void imx_drm_connector_destroy(struct drm_connector *connector) 38 { 39 drm_connector_unregister(connector); 40 drm_connector_cleanup(connector); 41 } 42 EXPORT_SYMBOL_GPL(imx_drm_connector_destroy); 43 44 static 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 69 static 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 75 static 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 } 113 114 static const struct drm_mode_config_helper_funcs imx_drm_mode_config_helpers = { 115 .atomic_commit_tail = imx_drm_atomic_commit_tail, 116 }; 117 118 119 int 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 } 140 EXPORT_SYMBOL_GPL(imx_drm_encoder_parse_of); 141 142 static const struct drm_ioctl_desc imx_drm_ioctls[] = { 143 /* none so far */ 144 }; 145 146 static 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 } 162 163 static 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 }; 176 177 static 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 } 196 197 static 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_dma_setup(drm, legacyfb_depth); 253 254 return 0; 255 256 err_poll_fini: 257 drm_kms_helper_poll_fini(drm); 258 component_unbind_all(drm->dev, drm); 259 err_kms: 260 dev_set_drvdata(dev, NULL); 261 drm_dev_put(drm); 262 263 return ret; 264 } 265 266 static void imx_drm_unbind(struct device *dev) 267 { 268 struct drm_device *drm = dev_get_drvdata(dev); 269 270 drm_dev_unregister(drm); 271 272 drm_kms_helper_poll_fini(drm); 273 drm_atomic_helper_shutdown(drm); 274 275 component_unbind_all(drm->dev, drm); 276 277 drm_dev_put(drm); 278 279 dev_set_drvdata(dev, NULL); 280 } 281 282 static const struct component_master_ops imx_drm_ops = { 283 .bind = imx_drm_bind, 284 .unbind = imx_drm_unbind, 285 }; 286 287 static int imx_drm_platform_probe(struct platform_device *pdev) 288 { 289 int ret = drm_of_component_probe(&pdev->dev, compare_of, &imx_drm_ops); 290 291 if (!ret) 292 ret = dma_set_coherent_mask(&pdev->dev, DMA_BIT_MASK(32)); 293 294 return ret; 295 } 296 297 static void imx_drm_platform_remove(struct platform_device *pdev) 298 { 299 component_master_del(&pdev->dev, &imx_drm_ops); 300 } 301 302 static void imx_drm_platform_shutdown(struct platform_device *pdev) 303 { 304 drm_atomic_helper_shutdown(platform_get_drvdata(pdev)); 305 } 306 307 #ifdef CONFIG_PM_SLEEP 308 static int imx_drm_suspend(struct device *dev) 309 { 310 struct drm_device *drm_dev = dev_get_drvdata(dev); 311 312 return drm_mode_config_helper_suspend(drm_dev); 313 } 314 315 static int imx_drm_resume(struct device *dev) 316 { 317 struct drm_device *drm_dev = dev_get_drvdata(dev); 318 319 return drm_mode_config_helper_resume(drm_dev); 320 } 321 #endif 322 323 static SIMPLE_DEV_PM_OPS(imx_drm_pm_ops, imx_drm_suspend, imx_drm_resume); 324 325 static const struct of_device_id imx_drm_dt_ids[] = { 326 { .compatible = "fsl,imx-display-subsystem", }, 327 { /* sentinel */ }, 328 }; 329 MODULE_DEVICE_TABLE(of, imx_drm_dt_ids); 330 331 static struct platform_driver imx_drm_pdrv = { 332 .probe = imx_drm_platform_probe, 333 .remove_new = imx_drm_platform_remove, 334 .shutdown = imx_drm_platform_shutdown, 335 .driver = { 336 .name = "imx-drm", 337 .pm = &imx_drm_pm_ops, 338 .of_match_table = imx_drm_dt_ids, 339 }, 340 }; 341 342 static struct platform_driver * const drivers[] = { 343 &imx_drm_pdrv, 344 &ipu_drm_driver, 345 }; 346 347 static int __init imx_drm_init(void) 348 { 349 if (drm_firmware_drivers_only()) 350 return -ENODEV; 351 352 return platform_register_drivers(drivers, ARRAY_SIZE(drivers)); 353 } 354 module_init(imx_drm_init); 355 356 static void __exit imx_drm_exit(void) 357 { 358 platform_unregister_drivers(drivers, ARRAY_SIZE(drivers)); 359 } 360 module_exit(imx_drm_exit); 361 362 MODULE_AUTHOR("Sascha Hauer <s.hauer@pengutronix.de>"); 363 MODULE_DESCRIPTION("i.MX drm driver core"); 364 MODULE_LICENSE("GPL"); 365