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