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