imx-drm-core.c (8727B)
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_fb_cma_helper.h> 20#include <drm/drm_fb_helper.h> 21#include <drm/drm_gem_cma_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_plane_helper.h> 26#include <drm/drm_probe_helper.h> 27#include <drm/drm_vblank.h> 28 29#include "imx-drm.h" 30#include "ipuv3-plane.h" 31 32#define MAX_CRTC 4 33 34static int legacyfb_depth = 16; 35module_param(legacyfb_depth, int, 0444); 36 37DEFINE_DRM_GEM_CMA_FOPS(imx_drm_driver_fops); 38 39void imx_drm_connector_destroy(struct drm_connector *connector) 40{ 41 drm_connector_unregister(connector); 42 drm_connector_cleanup(connector); 43} 44EXPORT_SYMBOL_GPL(imx_drm_connector_destroy); 45 46static int imx_drm_atomic_check(struct drm_device *dev, 47 struct drm_atomic_state *state) 48{ 49 int ret; 50 51 ret = drm_atomic_helper_check(dev, state); 52 if (ret) 53 return ret; 54 55 /* 56 * Check modeset again in case crtc_state->mode_changed is 57 * updated in plane's ->atomic_check callback. 58 */ 59 ret = drm_atomic_helper_check_modeset(dev, state); 60 if (ret) 61 return ret; 62 63 /* Assign PRG/PRE channels and check if all constrains are satisfied. */ 64 ret = ipu_planes_assign_pre(dev, state); 65 if (ret) 66 return ret; 67 68 return ret; 69} 70 71static const struct drm_mode_config_funcs imx_drm_mode_config_funcs = { 72 .fb_create = drm_gem_fb_create, 73 .atomic_check = imx_drm_atomic_check, 74 .atomic_commit = drm_atomic_helper_commit, 75}; 76 77static void imx_drm_atomic_commit_tail(struct drm_atomic_state *state) 78{ 79 struct drm_device *dev = state->dev; 80 struct drm_plane *plane; 81 struct drm_plane_state *old_plane_state, *new_plane_state; 82 bool plane_disabling = false; 83 int i; 84 85 drm_atomic_helper_commit_modeset_disables(dev, state); 86 87 drm_atomic_helper_commit_planes(dev, state, 88 DRM_PLANE_COMMIT_ACTIVE_ONLY | 89 DRM_PLANE_COMMIT_NO_DISABLE_AFTER_MODESET); 90 91 drm_atomic_helper_commit_modeset_enables(dev, state); 92 93 for_each_oldnew_plane_in_state(state, plane, old_plane_state, new_plane_state, i) { 94 if (drm_atomic_plane_disabling(old_plane_state, new_plane_state)) 95 plane_disabling = true; 96 } 97 98 /* 99 * The flip done wait is only strictly required by imx-drm if a deferred 100 * plane disable is in-flight. As the core requires blocking commits 101 * to wait for the flip it is done here unconditionally. This keeps the 102 * workitem around a bit longer than required for the majority of 103 * non-blocking commits, but we accept that for the sake of simplicity. 104 */ 105 drm_atomic_helper_wait_for_flip_done(dev, state); 106 107 if (plane_disabling) { 108 for_each_old_plane_in_state(state, plane, old_plane_state, i) 109 ipu_plane_disable_deferred(plane); 110 111 } 112 113 drm_atomic_helper_commit_hw_done(state); 114} 115 116static const struct drm_mode_config_helper_funcs imx_drm_mode_config_helpers = { 117 .atomic_commit_tail = imx_drm_atomic_commit_tail, 118}; 119 120 121int imx_drm_encoder_parse_of(struct drm_device *drm, 122 struct drm_encoder *encoder, struct device_node *np) 123{ 124 uint32_t crtc_mask = drm_of_find_possible_crtcs(drm, np); 125 126 /* 127 * If we failed to find the CRTC(s) which this encoder is 128 * supposed to be connected to, it's because the CRTC has 129 * not been registered yet. Defer probing, and hope that 130 * the required CRTC is added later. 131 */ 132 if (crtc_mask == 0) 133 return -EPROBE_DEFER; 134 135 encoder->possible_crtcs = crtc_mask; 136 137 /* FIXME: cloning support not clear, disable it all for now */ 138 encoder->possible_clones = 0; 139 140 return 0; 141} 142EXPORT_SYMBOL_GPL(imx_drm_encoder_parse_of); 143 144static const struct drm_ioctl_desc imx_drm_ioctls[] = { 145 /* none so far */ 146}; 147 148static int imx_drm_dumb_create(struct drm_file *file_priv, 149 struct drm_device *drm, 150 struct drm_mode_create_dumb *args) 151{ 152 u32 width = args->width; 153 int ret; 154 155 args->width = ALIGN(width, 8); 156 157 ret = drm_gem_cma_dumb_create(file_priv, drm, args); 158 if (ret) 159 return ret; 160 161 args->width = width; 162 return ret; 163} 164 165static const struct drm_driver imx_drm_driver = { 166 .driver_features = DRIVER_MODESET | DRIVER_GEM | DRIVER_ATOMIC, 167 DRM_GEM_CMA_DRIVER_OPS_WITH_DUMB_CREATE(imx_drm_dumb_create), 168 .ioctls = imx_drm_ioctls, 169 .num_ioctls = ARRAY_SIZE(imx_drm_ioctls), 170 .fops = &imx_drm_driver_fops, 171 .name = "imx-drm", 172 .desc = "i.MX DRM graphics", 173 .date = "20120507", 174 .major = 1, 175 .minor = 0, 176 .patchlevel = 0, 177}; 178 179static int compare_of(struct device *dev, void *data) 180{ 181 struct device_node *np = data; 182 183 /* Special case for DI, dev->of_node may not be set yet */ 184 if (strcmp(dev->driver->name, "imx-ipuv3-crtc") == 0) { 185 struct ipu_client_platformdata *pdata = dev->platform_data; 186 187 return pdata->of_node == np; 188 } 189 190 /* Special case for LDB, one device for two channels */ 191 if (of_node_name_eq(np, "lvds-channel")) { 192 np = of_get_parent(np); 193 of_node_put(np); 194 } 195 196 return dev->of_node == np; 197} 198 199static int imx_drm_bind(struct device *dev) 200{ 201 struct drm_device *drm; 202 int ret; 203 204 drm = drm_dev_alloc(&imx_drm_driver, dev); 205 if (IS_ERR(drm)) 206 return PTR_ERR(drm); 207 208 /* 209 * set max width and height as default value(4096x4096). 210 * this value would be used to check framebuffer size limitation 211 * at drm_mode_addfb(). 212 */ 213 drm->mode_config.min_width = 1; 214 drm->mode_config.min_height = 1; 215 drm->mode_config.max_width = 4096; 216 drm->mode_config.max_height = 4096; 217 drm->mode_config.funcs = &imx_drm_mode_config_funcs; 218 drm->mode_config.helper_private = &imx_drm_mode_config_helpers; 219 drm->mode_config.normalize_zpos = true; 220 221 ret = drmm_mode_config_init(drm); 222 if (ret) 223 goto err_kms; 224 225 ret = drm_vblank_init(drm, MAX_CRTC); 226 if (ret) 227 goto err_kms; 228 229 dev_set_drvdata(dev, drm); 230 231 /* Now try and bind all our sub-components */ 232 ret = component_bind_all(dev, drm); 233 if (ret) 234 goto err_kms; 235 236 drm_mode_config_reset(drm); 237 238 /* 239 * All components are now initialised, so setup the fb helper. 240 * The fb helper takes copies of key hardware information, so the 241 * crtcs/connectors/encoders must not change after this point. 242 */ 243 if (legacyfb_depth != 16 && legacyfb_depth != 32) { 244 dev_warn(dev, "Invalid legacyfb_depth. Defaulting to 16bpp\n"); 245 legacyfb_depth = 16; 246 } 247 248 drm_kms_helper_poll_init(drm); 249 250 ret = drm_dev_register(drm, 0); 251 if (ret) 252 goto err_poll_fini; 253 254 drm_fbdev_generic_setup(drm, legacyfb_depth); 255 256 return 0; 257 258err_poll_fini: 259 drm_kms_helper_poll_fini(drm); 260 component_unbind_all(drm->dev, drm); 261err_kms: 262 drm_dev_put(drm); 263 264 return ret; 265} 266 267static void imx_drm_unbind(struct device *dev) 268{ 269 struct drm_device *drm = dev_get_drvdata(dev); 270 271 drm_dev_unregister(drm); 272 273 drm_kms_helper_poll_fini(drm); 274 275 component_unbind_all(drm->dev, drm); 276 277 drm_dev_put(drm); 278 279 dev_set_drvdata(dev, NULL); 280} 281 282static const struct component_master_ops imx_drm_ops = { 283 .bind = imx_drm_bind, 284 .unbind = imx_drm_unbind, 285}; 286 287static 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 297static int imx_drm_platform_remove(struct platform_device *pdev) 298{ 299 component_master_del(&pdev->dev, &imx_drm_ops); 300 return 0; 301} 302 303#ifdef CONFIG_PM_SLEEP 304static 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 311static 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 319static SIMPLE_DEV_PM_OPS(imx_drm_pm_ops, imx_drm_suspend, imx_drm_resume); 320 321static const struct of_device_id imx_drm_dt_ids[] = { 322 { .compatible = "fsl,imx-display-subsystem", }, 323 { /* sentinel */ }, 324}; 325MODULE_DEVICE_TABLE(of, imx_drm_dt_ids); 326 327static struct platform_driver imx_drm_pdrv = { 328 .probe = imx_drm_platform_probe, 329 .remove = imx_drm_platform_remove, 330 .driver = { 331 .name = "imx-drm", 332 .pm = &imx_drm_pm_ops, 333 .of_match_table = imx_drm_dt_ids, 334 }, 335}; 336 337static struct platform_driver * const drivers[] = { 338 &imx_drm_pdrv, 339 &ipu_drm_driver, 340}; 341 342static int __init imx_drm_init(void) 343{ 344 if (drm_firmware_drivers_only()) 345 return -ENODEV; 346 347 return platform_register_drivers(drivers, ARRAY_SIZE(drivers)); 348} 349module_init(imx_drm_init); 350 351static void __exit imx_drm_exit(void) 352{ 353 platform_unregister_drivers(drivers, ARRAY_SIZE(drivers)); 354} 355module_exit(imx_drm_exit); 356 357MODULE_AUTHOR("Sascha Hauer <s.hauer@pengutronix.de>"); 358MODULE_DESCRIPTION("i.MX drm driver core"); 359MODULE_LICENSE("GPL");