drivers/gpu/drm/mxsfb/lcdif_drv.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * Copyright (C) 2022 Marek Vasut <[email protected]>
   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.h>
  13 #include <linux/of_graph.h>
  14 #include <linux/platform_device.h>
  15 #include <linux/pm_runtime.h>
  16
  17 #include <drm/drm_atomic_helper.h>
  18 #include <drm/drm_bridge.h>
  19 #include <drm/drm_client_setup.h>
  20 #include <drm/drm_drv.h>
  21 #include <drm/drm_encoder.h>
  22 #include <drm/drm_fbdev_dma.h>
  23 #include <drm/drm_gem_dma_helper.h>
  24 #include <drm/drm_gem_framebuffer_helper.h>
  25 #include <drm/drm_mode_config.h>
  26 #include <drm/drm_module.h>
  27 #include <drm/drm_of.h>
  28 #include <drm/drm_probe_helper.h>
  29 #include <drm/drm_vblank.h>
  30
  31 #include "lcdif_drv.h"
  32 #include "lcdif_regs.h"
  33
  34 static const struct drm_mode_config_funcs lcdif_mode_config_funcs = {
  35         .fb_create              = drm_gem_fb_create,
  36         .atomic_check           = drm_atomic_helper_check,
  37         .atomic_commit          = drm_atomic_helper_commit,
  38 };
  39
  40 static const struct drm_mode_config_helper_funcs lcdif_mode_config_helpers = {
  41         .atomic_commit_tail = drm_atomic_helper_commit_tail_rpm,
  42 };
  43
  44 static const struct drm_encoder_funcs lcdif_encoder_funcs = {
  45         .destroy = drm_encoder_cleanup,
  46 };
  47
  48 static int lcdif_attach_bridge(struct lcdif_drm_private *lcdif)
  49 {
  50         struct device *dev = lcdif->drm->dev;
  51         struct device_node *ep;
  52         struct drm_bridge *bridge;
  53         int ret;
  54
  55         for_each_endpoint_of_node(dev->of_node, ep) {
  56                 struct device_node *remote;
  57                 struct of_endpoint of_ep;
  58                 struct drm_encoder *encoder;
  59
  60                 remote = of_graph_get_remote_port_parent(ep);
  61                 if (!of_device_is_available(remote)) {
  62                         of_node_put(remote);
  63                         continue;
  64                 }
  65                 of_node_put(remote);
  66
  67                 ret = of_graph_parse_endpoint(ep, &of_ep);
  68                 if (ret < 0) {
  69                         dev_err(dev, "Failed to parse endpoint %pOF\n", ep);
  70                         of_node_put(ep);
  71                         return ret;
  72                 }
  73
  74                 bridge = devm_drm_of_get_bridge(dev, dev->of_node, 0, of_ep.id);
  75                 if (IS_ERR(bridge)) {
  76                         of_node_put(ep);
  77                         return dev_err_probe(dev, PTR_ERR(bridge),
  78                                              "Failed to get bridge for endpoint%u\n",
  79                                              of_ep.id);
  80                 }
  81
  82                 encoder = devm_kzalloc(dev, sizeof(*encoder), GFP_KERNEL);
  83                 if (!encoder) {
  84                         dev_err(dev, "Failed to allocate encoder for endpoint%u\n",
  85                                 of_ep.id);
  86                         of_node_put(ep);
  87                         return -ENOMEM;
  88                 }
  89
  90                 encoder->possible_crtcs = drm_crtc_mask(&lcdif->crtc);
  91                 ret = drm_encoder_init(lcdif->drm, encoder, &lcdif_encoder_funcs,
  92                                        DRM_MODE_ENCODER_NONE, NULL);
  93                 if (ret) {
  94                         dev_err(dev, "Failed to initialize encoder for endpoint%u: %d\n",
  95                                 of_ep.id, ret);
  96                         of_node_put(ep);
  97                         return ret;
  98                 }
  99
 100                 ret = drm_bridge_attach(encoder, bridge, NULL, 0);
 101                 if (ret) {
 102                         of_node_put(ep);
 103                         return dev_err_probe(dev, ret,
 104                                              "Failed to attach bridge for endpoint%u\n",
 105                                              of_ep.id);
 106                 }
 107         }
 108
 109         return 0;
 110 }
 111
 112 static irqreturn_t lcdif_irq_handler(int irq, void *data)
 113 {
 114         struct drm_device *drm = data;
 115         struct lcdif_drm_private *lcdif = drm->dev_private;
 116         u32 reg, stat;
 117
 118         stat = readl(lcdif->base + LCDC_V8_INT_STATUS_D0);
 119         if (!stat)
 120                 return IRQ_NONE;
 121
 122         if (stat & INT_STATUS_D0_VS_BLANK) {
 123                 reg = readl(lcdif->base + LCDC_V8_CTRLDESCL0_5);
 124                 if (!(reg & CTRLDESCL0_5_SHADOW_LOAD_EN))
 125                         drm_crtc_handle_vblank(&lcdif->crtc);
 126         }
 127
 128         writel(stat, lcdif->base + LCDC_V8_INT_STATUS_D0);
 129
 130         return IRQ_HANDLED;
 131 }
 132
 133 static int lcdif_load(struct drm_device *drm)
 134 {
 135         struct platform_device *pdev = to_platform_device(drm->dev);
 136         struct lcdif_drm_private *lcdif;
 137         struct resource *res;
 138         int ret;
 139
 140         lcdif = devm_kzalloc(&pdev->dev, sizeof(*lcdif), GFP_KERNEL);
 141         if (!lcdif)
 142                 return -ENOMEM;
 143
 144         lcdif->drm = drm;
 145         drm->dev_private = lcdif;
 146
 147         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 148         lcdif->base = devm_ioremap_resource(drm->dev, res);
 149         if (IS_ERR(lcdif->base))
 150                 return PTR_ERR(lcdif->base);
 151
 152         lcdif->clk = devm_clk_get(drm->dev, "pix");
 153         if (IS_ERR(lcdif->clk))
 154                 return PTR_ERR(lcdif->clk);
 155
 156         lcdif->clk_axi = devm_clk_get(drm->dev, "axi");
 157         if (IS_ERR(lcdif->clk_axi))
 158                 return PTR_ERR(lcdif->clk_axi);
 159
 160         lcdif->clk_disp_axi = devm_clk_get(drm->dev, "disp_axi");
 161         if (IS_ERR(lcdif->clk_disp_axi))
 162                 return PTR_ERR(lcdif->clk_disp_axi);
 163
 164         platform_set_drvdata(pdev, drm);
 165
 166         ret = dma_set_mask_and_coherent(drm->dev, DMA_BIT_MASK(36));
 167         if (ret)
 168                 return ret;
 169
 170         /* Modeset init */
 171         ret = drmm_mode_config_init(drm);
 172         if (ret) {
 173                 dev_err(drm->dev, "Failed to initialize mode config\n");
 174                 return ret;
 175         }
 176
 177         ret = lcdif_kms_init(lcdif);
 178         if (ret < 0) {
 179                 dev_err(drm->dev, "Failed to initialize KMS pipeline\n");
 180                 return ret;
 181         }
 182
 183         ret = drm_vblank_init(drm, drm->mode_config.num_crtc);
 184         if (ret < 0) {
 185                 dev_err(drm->dev, "Failed to initialise vblank\n");
 186                 return ret;
 187         }
 188
 189         /* Start with vertical blanking interrupt reporting disabled. */
 190         drm_crtc_vblank_off(&lcdif->crtc);
 191
 192         ret = lcdif_attach_bridge(lcdif);
 193         if (ret)
 194                 return dev_err_probe(drm->dev, ret, "Cannot connect bridge\n");
 195
 196         drm->mode_config.min_width      = LCDIF_MIN_XRES;
 197         drm->mode_config.min_height     = LCDIF_MIN_YRES;
 198         drm->mode_config.max_width      = LCDIF_MAX_XRES;
 199         drm->mode_config.max_height     = LCDIF_MAX_YRES;
 200         drm->mode_config.funcs          = &lcdif_mode_config_funcs;
 201         drm->mode_config.helper_private = &lcdif_mode_config_helpers;
 202
 203         drm_mode_config_reset(drm);
 204
 205         ret = platform_get_irq(pdev, 0);
 206         if (ret < 0)
 207                 return ret;
 208         lcdif->irq = ret;
 209
 210         ret = devm_request_irq(drm->dev, lcdif->irq, lcdif_irq_handler, 0,
 211                                drm->driver->name, drm);
 212         if (ret < 0) {
 213                 dev_err(drm->dev, "Failed to install IRQ handler\n");
 214                 return ret;
 215         }
 216
 217         drm_kms_helper_poll_init(drm);
 218
 219         drm_helper_hpd_irq_event(drm);
 220
 221         pm_runtime_enable(drm->dev);
 222
 223         return 0;
 224 }
 225
 226 static void lcdif_unload(struct drm_device *drm)
 227 {
 228         struct lcdif_drm_private *lcdif = drm->dev_private;
 229
 230         pm_runtime_get_sync(drm->dev);
 231
 232         drm_crtc_vblank_off(&lcdif->crtc);
 233
 234         drm_kms_helper_poll_fini(drm);
 235
 236         pm_runtime_put_sync(drm->dev);
 237         pm_runtime_disable(drm->dev);
 238
 239         drm->dev_private = NULL;
 240 }
 241
 242 DEFINE_DRM_GEM_DMA_FOPS(fops);
 243
 244 static const struct drm_driver lcdif_driver = {
 245         .driver_features        = DRIVER_GEM | DRIVER_MODESET | DRIVER_ATOMIC,
 246         DRM_GEM_DMA_DRIVER_OPS,
 247         DRM_FBDEV_DMA_DRIVER_OPS,
 248         .fops   = &fops,
 249         .name   = "imx-lcdif",
 250         .desc   = "i.MX LCDIF Controller DRM",
 251         .date   = "20220417",
 252         .major  = 1,
 253         .minor  = 0,
 254 };
 255
 256 static const struct of_device_id lcdif_dt_ids[] = {
 257         { .compatible = "fsl,imx8mp-lcdif" },
 258         { .compatible = "fsl,imx93-lcdif" },
 259         { /* sentinel */ }
 260 };
 261 MODULE_DEVICE_TABLE(of, lcdif_dt_ids);
 262
 263 static int lcdif_probe(struct platform_device *pdev)
 264 {
 265         struct drm_device *drm;
 266         int ret;
 267
 268         drm = drm_dev_alloc(&lcdif_driver, &pdev->dev);
 269         if (IS_ERR(drm))
 270                 return PTR_ERR(drm);
 271
 272         ret = lcdif_load(drm);
 273         if (ret)
 274                 goto err_free;
 275
 276         ret = drm_dev_register(drm, 0);
 277         if (ret)
 278                 goto err_unload;
 279
 280         drm_client_setup(drm, NULL);
 281
 282         return 0;
 283
 284 err_unload:
 285         lcdif_unload(drm);
 286 err_free:
 287         drm_dev_put(drm);
 288
 289         return ret;
 290 }
 291
 292 static void lcdif_remove(struct platform_device *pdev)
 293 {
 294         struct drm_device *drm = platform_get_drvdata(pdev);
 295
 296         drm_dev_unregister(drm);
 297         drm_atomic_helper_shutdown(drm);
 298         lcdif_unload(drm);
 299         drm_dev_put(drm);
 300 }
 301
 302 static void lcdif_shutdown(struct platform_device *pdev)
 303 {
 304         struct drm_device *drm = platform_get_drvdata(pdev);
 305
 306         drm_atomic_helper_shutdown(drm);
 307 }
 308
 309 static int __maybe_unused lcdif_rpm_suspend(struct device *dev)
 310 {
 311         struct drm_device *drm = dev_get_drvdata(dev);
 312         struct lcdif_drm_private *lcdif = drm->dev_private;
 313
 314         /* These clock supply the DISPLAY CLOCK Domain */
 315         clk_disable_unprepare(lcdif->clk);
 316         /* These clock supply the System Bus, AXI, Write Path, LFIFO */
 317         clk_disable_unprepare(lcdif->clk_disp_axi);
 318         /* These clock supply the Control Bus, APB, APBH Ctrl Registers */
 319         clk_disable_unprepare(lcdif->clk_axi);
 320
 321         return 0;
 322 }
 323
 324 static int __maybe_unused lcdif_rpm_resume(struct device *dev)
 325 {
 326         struct drm_device *drm = dev_get_drvdata(dev);
 327         struct lcdif_drm_private *lcdif = drm->dev_private;
 328
 329         /* These clock supply the Control Bus, APB, APBH Ctrl Registers */
 330         clk_prepare_enable(lcdif->clk_axi);
 331         /* These clock supply the System Bus, AXI, Write Path, LFIFO */
 332         clk_prepare_enable(lcdif->clk_disp_axi);
 333         /* These clock supply the DISPLAY CLOCK Domain */
 334         clk_prepare_enable(lcdif->clk);
 335
 336         return 0;
 337 }
 338
 339 static int __maybe_unused lcdif_suspend(struct device *dev)
 340 {
 341         struct drm_device *drm = dev_get_drvdata(dev);
 342         int ret;
 343
 344         ret = drm_mode_config_helper_suspend(drm);
 345         if (ret)
 346                 return ret;
 347
 348         if (pm_runtime_suspended(dev))
 349                 return 0;
 350
 351         return lcdif_rpm_suspend(dev);
 352 }
 353
 354 static int __maybe_unused lcdif_resume(struct device *dev)
 355 {
 356         struct drm_device *drm = dev_get_drvdata(dev);
 357
 358         if (!pm_runtime_suspended(dev))
 359                 lcdif_rpm_resume(dev);
 360
 361         return drm_mode_config_helper_resume(drm);
 362 }
 363
 364 static const struct dev_pm_ops lcdif_pm_ops = {
 365         SET_SYSTEM_SLEEP_PM_OPS(lcdif_suspend, lcdif_resume)
 366         SET_RUNTIME_PM_OPS(lcdif_rpm_suspend, lcdif_rpm_resume, NULL)
 367 };
 368
 369 static struct platform_driver lcdif_platform_driver = {
 370         .probe          = lcdif_probe,
 371         .remove         = lcdif_remove,
 372         .shutdown       = lcdif_shutdown,
 373         .driver = {
 374                 .name           = "imx-lcdif",
 375                 .of_match_table = lcdif_dt_ids,
 376                 .pm             = &lcdif_pm_ops,
 377         },
 378 };
 379
 380 drm_module_platform_driver(lcdif_platform_driver);
 381
 382 MODULE_AUTHOR("Marek Vasut <[email protected]>");
 383 MODULE_DESCRIPTION("Freescale LCDIF DRM/KMS driver");
 384 MODULE_LICENSE("GPL");