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 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 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 }; 111 112 113 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 }; 139 140 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 args->pitch = DIV_ROUND_UP(args->width * args->bpp, 8); 149 args->size = args->pitch * args->height; 150 151 ret = drm_gem_dma_dumb_create_internal(file_priv, drm, args); 152 if (ret) 153 return ret; 154 155 args->width = width; 156 return ret; 157 } 158 159 static const struct drm_driver imx_drm_driver = { 160 .driver_features = DRIVER_MODESET | DRIVER_GEM | DRIVER_ATOMIC, 161 DRM_GEM_DMA_DRIVER_OPS_WITH_DUMB_CREATE(imx_drm_dumb_create), 162 DRM_FBDEV_DMA_DRIVER_OPS, 163 .ioctls = imx_drm_ioctls, 164 .num_ioctls = ARRAY_SIZE(imx_drm_ioctls), 165 .fops = &imx_drm_driver_fops, 166 .name = "imx-drm", 167 .desc = "i.MX DRM graphics", 168 .major = 1, 169 .minor = 0, 170 .patchlevel = 0, 171 }; 172 173 static int compare_of(struct device *dev, void *data) 174 { 175 struct device_node *np = data; 176 177 /* Special case for DI, dev->of_node may not be set yet */ 178 if (strcmp(dev->driver->name, "imx-ipuv3-crtc") == 0) { 179 struct ipu_client_platformdata *pdata = dev->platform_data; 180 181 return pdata->of_node == np; 182 } 183 184 /* Special case for LDB, one device for two channels */ 185 if (of_node_name_eq(np, "lvds-channel")) { 186 np = of_get_parent(np); 187 of_node_put(np); 188 } 189 190 return dev->of_node == np; 191 } 192 193 static int imx_drm_bind(struct device *dev) 194 { 195 struct drm_device *drm; 196 int ret; 197 198 drm = drm_dev_alloc(&imx_drm_driver, dev); 199 if (IS_ERR(drm)) 200 return PTR_ERR(drm); 201 202 /* 203 * set max width and height as default value(4096x4096). 204 * this value would be used to check framebuffer size limitation 205 * at drm_mode_addfb(). 206 */ 207 drm->mode_config.min_width = 1; 208 drm->mode_config.min_height = 1; 209 drm->mode_config.max_width = 4096; 210 drm->mode_config.max_height = 4096; 211 drm->mode_config.funcs = &imx_drm_mode_config_funcs; 212 drm->mode_config.helper_private = &imx_drm_mode_config_helpers; 213 drm->mode_config.normalize_zpos = true; 214 215 ret = drmm_mode_config_init(drm); 216 if (ret) 217 goto err_kms; 218 219 ret = drm_vblank_init(drm, MAX_CRTC); 220 if (ret) 221 goto err_kms; 222 223 dev_set_drvdata(dev, drm); 224 225 /* Now try and bind all our sub-components */ 226 ret = component_bind_all(dev, drm); 227 if (ret) 228 goto err_kms; 229 230 drm_mode_config_reset(drm); 231 232 /* 233 * All components are now initialised, so setup the fb helper. 234 * The fb helper takes copies of key hardware information, so the 235 * crtcs/connectors/encoders must not change after this point. 236 */ 237 if (legacyfb_depth != 16 && legacyfb_depth != 32) { 238 dev_warn(dev, "Invalid legacyfb_depth. Defaulting to 16bpp\n"); 239 legacyfb_depth = 16; 240 } 241 242 drm_kms_helper_poll_init(drm); 243 244 ret = drm_dev_register(drm, 0); 245 if (ret) 246 goto err_poll_fini; 247 248 drm_client_setup_with_color_mode(drm, legacyfb_depth); 249 250 return 0; 251 252 err_poll_fini: 253 drm_kms_helper_poll_fini(drm); 254 component_unbind_all(drm->dev, drm); 255 err_kms: 256 dev_set_drvdata(dev, NULL); 257 drm_dev_put(drm); 258 259 return ret; 260 } 261 262 static void imx_drm_unbind(struct device *dev) 263 { 264 struct drm_device *drm = dev_get_drvdata(dev); 265 266 drm_dev_unregister(drm); 267 268 drm_kms_helper_poll_fini(drm); 269 drm_atomic_helper_shutdown(drm); 270 271 component_unbind_all(drm->dev, drm); 272 273 drm_dev_put(drm); 274 275 dev_set_drvdata(dev, NULL); 276 } 277 278 static const struct component_master_ops imx_drm_ops = { 279 .bind = imx_drm_bind, 280 .unbind = imx_drm_unbind, 281 }; 282 283 static int imx_drm_platform_probe(struct platform_device *pdev) 284 { 285 int ret = drm_of_component_probe(&pdev->dev, compare_of, &imx_drm_ops); 286 287 if (!ret) 288 ret = dma_set_coherent_mask(&pdev->dev, DMA_BIT_MASK(32)); 289 290 return ret; 291 } 292 293 static void imx_drm_platform_remove(struct platform_device *pdev) 294 { 295 component_master_del(&pdev->dev, &imx_drm_ops); 296 } 297 298 static void imx_drm_platform_shutdown(struct platform_device *pdev) 299 { 300 drm_atomic_helper_shutdown(platform_get_drvdata(pdev)); 301 } 302 303 #ifdef CONFIG_PM_SLEEP 304 static int imx_drm_suspend(struct device *dev) 305 { 306 struct drm_device *drm_dev = dev_get_drvdata(dev); 307 308 return drm_mode_config_helper_suspend(drm_dev); 309 } 310 311 static int imx_drm_resume(struct device *dev) 312 { 313 struct drm_device *drm_dev = dev_get_drvdata(dev); 314 315 return drm_mode_config_helper_resume(drm_dev); 316 } 317 #endif 318 319 static SIMPLE_DEV_PM_OPS(imx_drm_pm_ops, imx_drm_suspend, imx_drm_resume); 320 321 static const struct of_device_id imx_drm_dt_ids[] = { 322 { .compatible = "fsl,imx-display-subsystem", }, 323 { /* sentinel */ }, 324 }; 325 MODULE_DEVICE_TABLE(of, imx_drm_dt_ids); 326 327 static struct platform_driver imx_drm_pdrv = { 328 .probe = imx_drm_platform_probe, 329 .remove = imx_drm_platform_remove, 330 .shutdown = imx_drm_platform_shutdown, 331 .driver = { 332 .name = "imx-drm", 333 .pm = &imx_drm_pm_ops, 334 .of_match_table = imx_drm_dt_ids, 335 }, 336 }; 337 338 static struct platform_driver * const drivers[] = { 339 &imx_drm_pdrv, 340 &ipu_drm_driver, 341 }; 342 343 static int __init imx_drm_init(void) 344 { 345 if (drm_firmware_drivers_only()) 346 return -ENODEV; 347 348 return platform_register_drivers(drivers, ARRAY_SIZE(drivers)); 349 } 350 module_init(imx_drm_init); 351 352 static void __exit imx_drm_exit(void) 353 { 354 platform_unregister_drivers(drivers, ARRAY_SIZE(drivers)); 355 } 356 module_exit(imx_drm_exit); 357 358 MODULE_AUTHOR("Sascha Hauer <s.hauer@pengutronix.de>"); 359 MODULE_DESCRIPTION("i.MX drm driver core"); 360 MODULE_LICENSE("GPL"); 361