drivers/gpu/drm/stm/drv.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * Copyright (C) STMicroelectronics SA 2017
   4  *
   5  * Authors: Philippe Cornu <[email protected]>
   6  *          Yannick Fertre <[email protected]>
   7  *          Fabien Dessenne <[email protected]>
   8  *          Mickael Reulier <[email protected]>
   9  */
  10
  11 #include <linux/aperture.h>
  12 #include <linux/component.h>
  13 #include <linux/dma-mapping.h>
  14 #include <linux/mod_devicetable.h>
  15 #include <linux/module.h>
  16 #include <linux/platform_device.h>
  17 #include <linux/pm_runtime.h>
  18
  19 #include <drm/clients/drm_client_setup.h>
  20 #include <drm/drm_atomic.h>
  21 #include <drm/drm_atomic_helper.h>
  22 #include <drm/drm_drv.h>
  23 #include <drm/drm_fbdev_dma.h>
  24 #include <drm/drm_fourcc.h>
  25 #include <drm/drm_gem_dma_helper.h>
  26 #include <drm/drm_gem_framebuffer_helper.h>
  27 #include <drm/drm_module.h>
  28 #include <drm/drm_probe_helper.h>
  29 #include <drm/drm_vblank.h>
  30 #include <drm/drm_managed.h>
  31
  32 #include "ltdc.h"
  33
  34 #define STM_MAX_FB_WIDTH        2048
  35 #define STM_MAX_FB_HEIGHT       2048 /* same as width to handle orientation */
  36
  37 static const struct drm_mode_config_funcs drv_mode_config_funcs = {
  38         .fb_create = drm_gem_fb_create,
  39         .atomic_check = drm_atomic_helper_check,
  40         .atomic_commit = drm_atomic_helper_commit,
  41 };
  42
  43 static int stm_gem_dma_dumb_create(struct drm_file *file,
  44                                    struct drm_device *dev,
  45                                    struct drm_mode_create_dumb *args)
  46 {
  47         unsigned int min_pitch = DIV_ROUND_UP(args->width * args->bpp, 8);
  48
  49         /*
  50          * in order to optimize data transfer, pitch is aligned on
  51          * 128 bytes, height is aligned on 4 bytes
  52          */
  53         args->pitch = roundup(min_pitch, 128);
  54         args->height = roundup(args->height, 4);
  55
  56         return drm_gem_dma_dumb_create_internal(file, dev, args);
  57 }
  58
  59 DEFINE_DRM_GEM_DMA_FOPS(drv_driver_fops);
  60
  61 static const struct drm_driver drv_driver = {
  62         .driver_features = DRIVER_MODESET | DRIVER_GEM | DRIVER_ATOMIC,
  63         .name = "stm",
  64         .desc = "STMicroelectronics SoC DRM",
  65         .major = 1,
  66         .minor = 0,
  67         .patchlevel = 0,
  68         .fops = &drv_driver_fops,
  69         DRM_GEM_DMA_DRIVER_OPS_WITH_DUMB_CREATE(stm_gem_dma_dumb_create),
  70         DRM_FBDEV_DMA_DRIVER_OPS,
  71 };
  72
  73 static int drv_load(struct drm_device *ddev)
  74 {
  75         struct platform_device *pdev = to_platform_device(ddev->dev);
  76         struct ltdc_device *ldev;
  77         int ret;
  78
  79         DRM_DEBUG("%s\n", __func__);
  80
  81         ldev = drmm_kzalloc(ddev, sizeof(*ldev), GFP_KERNEL);
  82         if (!ldev)
  83                 return -ENOMEM;
  84
  85         ddev->dev_private = (void *)ldev;
  86
  87         ret = drmm_mode_config_init(ddev);
  88         if (ret)
  89                 return ret;
  90
  91         /*
  92          * set max width and height as default value.
  93          * this value would be used to check framebuffer size limitation
  94          * at drm_mode_addfb().
  95          */
  96         ddev->mode_config.min_width = 0;
  97         ddev->mode_config.min_height = 0;
  98         ddev->mode_config.max_width = STM_MAX_FB_WIDTH;
  99         ddev->mode_config.max_height = STM_MAX_FB_HEIGHT;
 100         ddev->mode_config.funcs = &drv_mode_config_funcs;
 101         ddev->mode_config.normalize_zpos = true;
 102
 103         ret = ltdc_load(ddev);
 104         if (ret)
 105                 return ret;
 106
 107         drm_mode_config_reset(ddev);
 108         drm_kms_helper_poll_init(ddev);
 109
 110         platform_set_drvdata(pdev, ddev);
 111
 112         return 0;
 113 }
 114
 115 static void drv_unload(struct drm_device *ddev)
 116 {
 117         DRM_DEBUG("%s\n", __func__);
 118
 119         drm_kms_helper_poll_fini(ddev);
 120         drm_atomic_helper_shutdown(ddev);
 121         ltdc_unload(ddev);
 122 }
 123
 124 static __maybe_unused int drv_suspend(struct device *dev)
 125 {
 126         struct drm_device *ddev = dev_get_drvdata(dev);
 127         struct ltdc_device *ldev = ddev->dev_private;
 128         struct drm_atomic_state *state;
 129
 130         WARN_ON(ldev->suspend_state);
 131
 132         state = drm_atomic_helper_suspend(ddev);
 133         if (IS_ERR(state))
 134                 return PTR_ERR(state);
 135
 136         ldev->suspend_state = state;
 137         pm_runtime_force_suspend(dev);
 138
 139         return 0;
 140 }
 141
 142 static __maybe_unused int drv_resume(struct device *dev)
 143 {
 144         struct drm_device *ddev = dev_get_drvdata(dev);
 145         struct ltdc_device *ldev = ddev->dev_private;
 146         int ret;
 147
 148         if (WARN_ON(!ldev->suspend_state))
 149                 return -ENOENT;
 150
 151         pm_runtime_force_resume(dev);
 152         ret = drm_atomic_helper_resume(ddev, ldev->suspend_state);
 153         if (ret)
 154                 pm_runtime_force_suspend(dev);
 155
 156         ldev->suspend_state = NULL;
 157
 158         return ret;
 159 }
 160
 161 static __maybe_unused int drv_runtime_suspend(struct device *dev)
 162 {
 163         struct drm_device *ddev = dev_get_drvdata(dev);
 164
 165         DRM_DEBUG_DRIVER("\n");
 166         ltdc_suspend(ddev);
 167
 168         return 0;
 169 }
 170
 171 static __maybe_unused int drv_runtime_resume(struct device *dev)
 172 {
 173         struct drm_device *ddev = dev_get_drvdata(dev);
 174
 175         DRM_DEBUG_DRIVER("\n");
 176         return ltdc_resume(ddev);
 177 }
 178
 179 static const struct dev_pm_ops drv_pm_ops = {
 180         SET_SYSTEM_SLEEP_PM_OPS(drv_suspend, drv_resume)
 181         SET_RUNTIME_PM_OPS(drv_runtime_suspend,
 182                            drv_runtime_resume, NULL)
 183 };
 184
 185 static int stm_drm_platform_probe(struct platform_device *pdev)
 186 {
 187         struct device *dev = &pdev->dev;
 188         struct drm_device *ddev;
 189         int ret;
 190
 191         DRM_DEBUG("%s\n", __func__);
 192
 193         ret = aperture_remove_all_conflicting_devices(drv_driver.name);
 194         if (ret)
 195                 return ret;
 196
 197         dma_set_coherent_mask(dev, DMA_BIT_MASK(32));
 198
 199         ddev = drm_dev_alloc(&drv_driver, dev);
 200         if (IS_ERR(ddev))
 201                 return PTR_ERR(ddev);
 202
 203         ret = drv_load(ddev);
 204         if (ret)
 205                 goto err_put;
 206
 207         ret = drm_dev_register(ddev, 0);
 208         if (ret)
 209                 goto err_unload;
 210
 211         drm_client_setup_with_fourcc(ddev, DRM_FORMAT_RGB565);
 212
 213         return 0;
 214
 215 err_unload:
 216         drv_unload(ddev);
 217 err_put:
 218         drm_dev_put(ddev);
 219
 220         return ret;
 221 }
 222
 223 static void stm_drm_platform_remove(struct platform_device *pdev)
 224 {
 225         struct drm_device *ddev = platform_get_drvdata(pdev);
 226
 227         DRM_DEBUG("%s\n", __func__);
 228
 229         drm_dev_unregister(ddev);
 230         drv_unload(ddev);
 231         drm_dev_put(ddev);
 232 }
 233
 234 static void stm_drm_platform_shutdown(struct platform_device *pdev)
 235 {
 236         drm_atomic_helper_shutdown(platform_get_drvdata(pdev));
 237 }
 238
 239 static const struct of_device_id drv_dt_ids[] = {
 240         { .compatible = "st,stm32-ltdc"},
 241         { /* end node */ },
 242 };
 243 MODULE_DEVICE_TABLE(of, drv_dt_ids);
 244
 245 static struct platform_driver stm_drm_platform_driver = {
 246         .probe = stm_drm_platform_probe,
 247         .remove = stm_drm_platform_remove,
 248         .shutdown = stm_drm_platform_shutdown,
 249         .driver = {
 250                 .name = "stm32-display",
 251                 .of_match_table = drv_dt_ids,
 252                 .pm = &drv_pm_ops,
 253         },
 254 };
 255
 256 drm_module_platform_driver(stm_drm_platform_driver);
 257
 258 MODULE_AUTHOR("Philippe Cornu <[email protected]>");
 259 MODULE_AUTHOR("Yannick Fertre <[email protected]>");
 260 MODULE_AUTHOR("Fabien Dessenne <[email protected]>");
 261 MODULE_AUTHOR("Mickael Reulier <[email protected]>");
 262 MODULE_DESCRIPTION("STMicroelectronics ST DRM LTDC driver");
 263 MODULE_LICENSE("GPL v2");