1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * Copyright (C) 2022 Marek Vasut <marex@denx.de> 4 * 5 * This code is based on drivers/gpu/drm/mxsfb/mxsfb* 6 */ 7 8 #include <linux/clk.h> 9 #include <linux/dma-mapping.h> 10 #include <linux/io.h> 11 #include <linux/module.h> 12 #include <linux/of_device.h> 13 #include <linux/platform_device.h> 14 #include <linux/pm_runtime.h> 15 16 #include <drm/drm_atomic_helper.h> 17 #include <drm/drm_bridge.h> 18 #include <drm/drm_drv.h> 19 #include <drm/drm_fb_helper.h> 20 #include <drm/drm_gem_dma_helper.h> 21 #include <drm/drm_gem_framebuffer_helper.h> 22 #include <drm/drm_mode_config.h> 23 #include <drm/drm_module.h> 24 #include <drm/drm_of.h> 25 #include <drm/drm_probe_helper.h> 26 #include <drm/drm_vblank.h> 27 28 #include "lcdif_drv.h" 29 #include "lcdif_regs.h" 30 31 static const struct drm_mode_config_funcs lcdif_mode_config_funcs = { 32 .fb_create = drm_gem_fb_create, 33 .atomic_check = drm_atomic_helper_check, 34 .atomic_commit = drm_atomic_helper_commit, 35 }; 36 37 static const struct drm_mode_config_helper_funcs lcdif_mode_config_helpers = { 38 .atomic_commit_tail = drm_atomic_helper_commit_tail_rpm, 39 }; 40 41 static int lcdif_attach_bridge(struct lcdif_drm_private *lcdif) 42 { 43 struct drm_device *drm = lcdif->drm; 44 struct drm_bridge *bridge; 45 struct drm_panel *panel; 46 int ret; 47 48 ret = drm_of_find_panel_or_bridge(drm->dev->of_node, 0, 0, &panel, 49 &bridge); 50 if (ret) 51 return ret; 52 53 if (panel) { 54 bridge = devm_drm_panel_bridge_add_typed(drm->dev, panel, 55 DRM_MODE_CONNECTOR_DPI); 56 if (IS_ERR(bridge)) 57 return PTR_ERR(bridge); 58 } 59 60 if (!bridge) 61 return -ENODEV; 62 63 ret = drm_bridge_attach(&lcdif->encoder, bridge, NULL, 0); 64 if (ret) 65 return dev_err_probe(drm->dev, ret, "Failed to attach bridge\n"); 66 67 lcdif->bridge = bridge; 68 69 return 0; 70 } 71 72 static irqreturn_t lcdif_irq_handler(int irq, void *data) 73 { 74 struct drm_device *drm = data; 75 struct lcdif_drm_private *lcdif = drm->dev_private; 76 u32 reg, stat; 77 78 stat = readl(lcdif->base + LCDC_V8_INT_STATUS_D0); 79 if (!stat) 80 return IRQ_NONE; 81 82 if (stat & INT_STATUS_D0_VS_BLANK) { 83 reg = readl(lcdif->base + LCDC_V8_CTRLDESCL0_5); 84 if (!(reg & CTRLDESCL0_5_SHADOW_LOAD_EN)) 85 drm_crtc_handle_vblank(&lcdif->crtc); 86 } 87 88 writel(stat, lcdif->base + LCDC_V8_INT_STATUS_D0); 89 90 return IRQ_HANDLED; 91 } 92 93 static int lcdif_load(struct drm_device *drm) 94 { 95 struct platform_device *pdev = to_platform_device(drm->dev); 96 struct lcdif_drm_private *lcdif; 97 struct resource *res; 98 int ret; 99 100 lcdif = devm_kzalloc(&pdev->dev, sizeof(*lcdif), GFP_KERNEL); 101 if (!lcdif) 102 return -ENOMEM; 103 104 lcdif->drm = drm; 105 drm->dev_private = lcdif; 106 107 res = platform_get_resource(pdev, IORESOURCE_MEM, 0); 108 lcdif->base = devm_ioremap_resource(drm->dev, res); 109 if (IS_ERR(lcdif->base)) 110 return PTR_ERR(lcdif->base); 111 112 lcdif->clk = devm_clk_get(drm->dev, "pix"); 113 if (IS_ERR(lcdif->clk)) 114 return PTR_ERR(lcdif->clk); 115 116 lcdif->clk_axi = devm_clk_get(drm->dev, "axi"); 117 if (IS_ERR(lcdif->clk_axi)) 118 return PTR_ERR(lcdif->clk_axi); 119 120 lcdif->clk_disp_axi = devm_clk_get(drm->dev, "disp_axi"); 121 if (IS_ERR(lcdif->clk_disp_axi)) 122 return PTR_ERR(lcdif->clk_disp_axi); 123 124 platform_set_drvdata(pdev, drm); 125 126 ret = dma_set_mask_and_coherent(drm->dev, DMA_BIT_MASK(36)); 127 if (ret) 128 return ret; 129 130 /* Modeset init */ 131 drm_mode_config_init(drm); 132 133 ret = lcdif_kms_init(lcdif); 134 if (ret < 0) { 135 dev_err(drm->dev, "Failed to initialize KMS pipeline\n"); 136 return ret; 137 } 138 139 ret = drm_vblank_init(drm, drm->mode_config.num_crtc); 140 if (ret < 0) { 141 dev_err(drm->dev, "Failed to initialise vblank\n"); 142 return ret; 143 } 144 145 /* Start with vertical blanking interrupt reporting disabled. */ 146 drm_crtc_vblank_off(&lcdif->crtc); 147 148 ret = lcdif_attach_bridge(lcdif); 149 if (ret) 150 return dev_err_probe(drm->dev, ret, "Cannot connect bridge\n"); 151 152 drm->mode_config.min_width = LCDIF_MIN_XRES; 153 drm->mode_config.min_height = LCDIF_MIN_YRES; 154 drm->mode_config.max_width = LCDIF_MAX_XRES; 155 drm->mode_config.max_height = LCDIF_MAX_YRES; 156 drm->mode_config.funcs = &lcdif_mode_config_funcs; 157 drm->mode_config.helper_private = &lcdif_mode_config_helpers; 158 159 drm_mode_config_reset(drm); 160 161 ret = platform_get_irq(pdev, 0); 162 if (ret < 0) 163 return ret; 164 lcdif->irq = ret; 165 166 ret = devm_request_irq(drm->dev, lcdif->irq, lcdif_irq_handler, 0, 167 drm->driver->name, drm); 168 if (ret < 0) { 169 dev_err(drm->dev, "Failed to install IRQ handler\n"); 170 return ret; 171 } 172 173 drm_kms_helper_poll_init(drm); 174 175 drm_helper_hpd_irq_event(drm); 176 177 pm_runtime_enable(drm->dev); 178 179 return 0; 180 } 181 182 static void lcdif_unload(struct drm_device *drm) 183 { 184 struct lcdif_drm_private *lcdif = drm->dev_private; 185 186 pm_runtime_get_sync(drm->dev); 187 188 drm_crtc_vblank_off(&lcdif->crtc); 189 190 drm_kms_helper_poll_fini(drm); 191 drm_mode_config_cleanup(drm); 192 193 pm_runtime_put_sync(drm->dev); 194 pm_runtime_disable(drm->dev); 195 196 drm->dev_private = NULL; 197 } 198 199 DEFINE_DRM_GEM_DMA_FOPS(fops); 200 201 static const struct drm_driver lcdif_driver = { 202 .driver_features = DRIVER_GEM | DRIVER_MODESET | DRIVER_ATOMIC, 203 DRM_GEM_DMA_DRIVER_OPS, 204 .fops = &fops, 205 .name = "imx-lcdif", 206 .desc = "i.MX LCDIF Controller DRM", 207 .date = "20220417", 208 .major = 1, 209 .minor = 0, 210 }; 211 212 static const struct of_device_id lcdif_dt_ids[] = { 213 { .compatible = "fsl,imx8mp-lcdif" }, 214 { /* sentinel */ } 215 }; 216 MODULE_DEVICE_TABLE(of, lcdif_dt_ids); 217 218 static int lcdif_probe(struct platform_device *pdev) 219 { 220 struct drm_device *drm; 221 int ret; 222 223 drm = drm_dev_alloc(&lcdif_driver, &pdev->dev); 224 if (IS_ERR(drm)) 225 return PTR_ERR(drm); 226 227 ret = lcdif_load(drm); 228 if (ret) 229 goto err_free; 230 231 ret = drm_dev_register(drm, 0); 232 if (ret) 233 goto err_unload; 234 235 drm_fbdev_generic_setup(drm, 32); 236 237 return 0; 238 239 err_unload: 240 lcdif_unload(drm); 241 err_free: 242 drm_dev_put(drm); 243 244 return ret; 245 } 246 247 static int lcdif_remove(struct platform_device *pdev) 248 { 249 struct drm_device *drm = platform_get_drvdata(pdev); 250 251 drm_dev_unregister(drm); 252 drm_atomic_helper_shutdown(drm); 253 lcdif_unload(drm); 254 drm_dev_put(drm); 255 256 return 0; 257 } 258 259 static void lcdif_shutdown(struct platform_device *pdev) 260 { 261 struct drm_device *drm = platform_get_drvdata(pdev); 262 263 drm_atomic_helper_shutdown(drm); 264 } 265 266 static int __maybe_unused lcdif_rpm_suspend(struct device *dev) 267 { 268 struct drm_device *drm = dev_get_drvdata(dev); 269 struct lcdif_drm_private *lcdif = drm->dev_private; 270 271 /* These clock supply the DISPLAY CLOCK Domain */ 272 clk_disable_unprepare(lcdif->clk); 273 /* These clock supply the System Bus, AXI, Write Path, LFIFO */ 274 clk_disable_unprepare(lcdif->clk_disp_axi); 275 /* These clock supply the Control Bus, APB, APBH Ctrl Registers */ 276 clk_disable_unprepare(lcdif->clk_axi); 277 278 return 0; 279 } 280 281 static int __maybe_unused lcdif_rpm_resume(struct device *dev) 282 { 283 struct drm_device *drm = dev_get_drvdata(dev); 284 struct lcdif_drm_private *lcdif = drm->dev_private; 285 286 /* These clock supply the Control Bus, APB, APBH Ctrl Registers */ 287 clk_prepare_enable(lcdif->clk_axi); 288 /* These clock supply the System Bus, AXI, Write Path, LFIFO */ 289 clk_prepare_enable(lcdif->clk_disp_axi); 290 /* These clock supply the DISPLAY CLOCK Domain */ 291 clk_prepare_enable(lcdif->clk); 292 293 return 0; 294 } 295 296 static int __maybe_unused lcdif_suspend(struct device *dev) 297 { 298 struct drm_device *drm = dev_get_drvdata(dev); 299 int ret; 300 301 ret = drm_mode_config_helper_suspend(drm); 302 if (ret) 303 return ret; 304 305 return lcdif_rpm_suspend(dev); 306 } 307 308 static int __maybe_unused lcdif_resume(struct device *dev) 309 { 310 struct drm_device *drm = dev_get_drvdata(dev); 311 312 lcdif_rpm_resume(dev); 313 314 return drm_mode_config_helper_resume(drm); 315 } 316 317 static const struct dev_pm_ops lcdif_pm_ops = { 318 SET_SYSTEM_SLEEP_PM_OPS(lcdif_suspend, lcdif_resume) 319 SET_RUNTIME_PM_OPS(lcdif_rpm_suspend, lcdif_rpm_resume, NULL) 320 }; 321 322 static struct platform_driver lcdif_platform_driver = { 323 .probe = lcdif_probe, 324 .remove = lcdif_remove, 325 .shutdown = lcdif_shutdown, 326 .driver = { 327 .name = "imx-lcdif", 328 .of_match_table = lcdif_dt_ids, 329 .pm = &lcdif_pm_ops, 330 }, 331 }; 332 333 drm_module_platform_driver(lcdif_platform_driver); 334 335 MODULE_AUTHOR("Marek Vasut <marex@denx.de>"); 336 MODULE_DESCRIPTION("Freescale LCDIF DRM/KMS driver"); 337 MODULE_LICENSE("GPL"); 338