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/component.h>
  12 #include <linux/dma-mapping.h>
  13 #include <linux/module.h>
  14 #include <linux/of_platform.h>
  15 #include <linux/pm_runtime.h>
  16
  17 #include <drm/drm_atomic.h>
  18 #include <drm/drm_atomic_helper.h>
  19 #include <drm/drm_drv.h>
  20 #include <drm/drm_fb_cma_helper.h>
  21 #include <drm/drm_fb_helper.h>
  22 #include <drm/drm_gem_cma_helper.h>
  23 #include <drm/drm_gem_framebuffer_helper.h>
  24 #include <drm/drm_probe_helper.h>
  25 #include <drm/drm_vblank.h>
  26
  27 #include "ltdc.h"
  28
  29 #define STM_MAX_FB_WIDTH        2048
  30 #define STM_MAX_FB_HEIGHT       2048 /* same as width to handle orientation */
  31
  32 static const struct drm_mode_config_funcs drv_mode_config_funcs = {
  33         .fb_create = drm_gem_fb_create,
  34         .atomic_check = drm_atomic_helper_check,
  35         .atomic_commit = drm_atomic_helper_commit,
  36 };
  37
  38 static int stm_gem_cma_dumb_create(struct drm_file *file,
  39                                    struct drm_device *dev,
  40                                    struct drm_mode_create_dumb *args)
  41 {
  42         unsigned int min_pitch = DIV_ROUND_UP(args->width * args->bpp, 8);
  43
  44         /*
  45          * in order to optimize data transfer, pitch is aligned on
  46          * 128 bytes, height is aligned on 4 bytes
  47          */
  48         args->pitch = roundup(min_pitch, 128);
  49         args->height = roundup(args->height, 4);
  50
  51         return drm_gem_cma_dumb_create_internal(file, dev, args);
  52 }
  53
  54 DEFINE_DRM_GEM_CMA_FOPS(drv_driver_fops);
  55
  56 static struct drm_driver drv_driver = {
  57         .driver_features = DRIVER_MODESET | DRIVER_GEM | DRIVER_ATOMIC,
  58         .name = "stm",
  59         .desc = "STMicroelectronics SoC DRM",
  60         .date = "20170330",
  61         .major = 1,
  62         .minor = 0,
  63         .patchlevel = 0,
  64         .fops = &drv_driver_fops,
  65         .dumb_create = stm_gem_cma_dumb_create,
  66         .prime_handle_to_fd = drm_gem_prime_handle_to_fd,
  67         .prime_fd_to_handle = drm_gem_prime_fd_to_handle,
  68         .gem_free_object_unlocked = drm_gem_cma_free_object,
  69         .gem_vm_ops = &drm_gem_cma_vm_ops,
  70         .gem_prime_get_sg_table = drm_gem_cma_prime_get_sg_table,
  71         .gem_prime_import_sg_table = drm_gem_cma_prime_import_sg_table,
  72         .gem_prime_vmap = drm_gem_cma_prime_vmap,
  73         .gem_prime_vunmap = drm_gem_cma_prime_vunmap,
  74         .gem_prime_mmap = drm_gem_cma_prime_mmap,
  75 };
  76
  77 static int drv_load(struct drm_device *ddev)
  78 {
  79         struct platform_device *pdev = to_platform_device(ddev->dev);
  80         struct ltdc_device *ldev;
  81         int ret;
  82
  83         DRM_DEBUG("%s\n", __func__);
  84
  85         ldev = devm_kzalloc(ddev->dev, sizeof(*ldev), GFP_KERNEL);
  86         if (!ldev)
  87                 return -ENOMEM;
  88
  89         ddev->dev_private = (void *)ldev;
  90
  91         drm_mode_config_init(ddev);
  92
  93         /*
  94          * set max width and height as default value.
  95          * this value would be used to check framebuffer size limitation
  96          * at drm_mode_addfb().
  97          */
  98         ddev->mode_config.min_width = 0;
  99         ddev->mode_config.min_height = 0;
 100         ddev->mode_config.max_width = STM_MAX_FB_WIDTH;
 101         ddev->mode_config.max_height = STM_MAX_FB_HEIGHT;
 102         ddev->mode_config.funcs = &drv_mode_config_funcs;
 103
 104         ret = ltdc_load(ddev);
 105         if (ret)
 106                 goto err;
 107
 108         drm_mode_config_reset(ddev);
 109         drm_kms_helper_poll_init(ddev);
 110
 111         platform_set_drvdata(pdev, ddev);
 112
 113         return 0;
 114 err:
 115         drm_mode_config_cleanup(ddev);
 116         return ret;
 117 }
 118
 119 static void drv_unload(struct drm_device *ddev)
 120 {
 121         DRM_DEBUG("%s\n", __func__);
 122
 123         drm_kms_helper_poll_fini(ddev);
 124         ltdc_unload(ddev);
 125         drm_mode_config_cleanup(ddev);
 126 }
 127
 128 static __maybe_unused int drv_suspend(struct device *dev)
 129 {
 130         struct drm_device *ddev = dev_get_drvdata(dev);
 131         struct ltdc_device *ldev = ddev->dev_private;
 132         struct drm_atomic_state *state;
 133
 134         WARN_ON(ldev->suspend_state);
 135
 136         state = drm_atomic_helper_suspend(ddev);
 137         if (IS_ERR(state))
 138                 return PTR_ERR(state);
 139
 140         ldev->suspend_state = state;
 141         pm_runtime_force_suspend(dev);
 142
 143         return 0;
 144 }
 145
 146 static __maybe_unused int drv_resume(struct device *dev)
 147 {
 148         struct drm_device *ddev = dev_get_drvdata(dev);
 149         struct ltdc_device *ldev = ddev->dev_private;
 150         int ret;
 151
 152         if (WARN_ON(!ldev->suspend_state))
 153                 return -ENOENT;
 154
 155         pm_runtime_force_resume(dev);
 156         ret = drm_atomic_helper_resume(ddev, ldev->suspend_state);
 157         if (ret)
 158                 pm_runtime_force_suspend(dev);
 159
 160         ldev->suspend_state = NULL;
 161
 162         return ret;
 163 }
 164
 165 static __maybe_unused int drv_runtime_suspend(struct device *dev)
 166 {
 167         struct drm_device *ddev = dev_get_drvdata(dev);
 168
 169         DRM_DEBUG_DRIVER("\n");
 170         ltdc_suspend(ddev);
 171
 172         return 0;
 173 }
 174
 175 static __maybe_unused int drv_runtime_resume(struct device *dev)
 176 {
 177         struct drm_device *ddev = dev_get_drvdata(dev);
 178
 179         DRM_DEBUG_DRIVER("\n");
 180         return ltdc_resume(ddev);
 181 }
 182
 183 static const struct dev_pm_ops drv_pm_ops = {
 184         SET_SYSTEM_SLEEP_PM_OPS(drv_suspend, drv_resume)
 185         SET_RUNTIME_PM_OPS(drv_runtime_suspend,
 186                            drv_runtime_resume, NULL)
 187 };
 188
 189 static int stm_drm_platform_probe(struct platform_device *pdev)
 190 {
 191         struct device *dev = &pdev->dev;
 192         struct drm_device *ddev;
 193         int ret;
 194
 195         DRM_DEBUG("%s\n", __func__);
 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_put;
 210
 211         drm_fbdev_generic_setup(ddev, 16);
 212
 213         return 0;
 214
 215 err_put:
 216         drm_dev_put(ddev);
 217
 218         return ret;
 219 }
 220
 221 static int stm_drm_platform_remove(struct platform_device *pdev)
 222 {
 223         struct drm_device *ddev = platform_get_drvdata(pdev);
 224
 225         DRM_DEBUG("%s\n", __func__);
 226
 227         drm_dev_unregister(ddev);
 228         drv_unload(ddev);
 229         drm_dev_put(ddev);
 230
 231         return 0;
 232 }
 233
 234 static const struct of_device_id drv_dt_ids[] = {
 235         { .compatible = "st,stm32-ltdc"},
 236         { /* end node */ },
 237 };
 238 MODULE_DEVICE_TABLE(of, drv_dt_ids);
 239
 240 static struct platform_driver stm_drm_platform_driver = {
 241         .probe = stm_drm_platform_probe,
 242         .remove = stm_drm_platform_remove,
 243         .driver = {
 244                 .name = "stm32-display",
 245                 .of_match_table = drv_dt_ids,
 246                 .pm = &drv_pm_ops,
 247         },
 248 };
 249
 250 module_platform_driver(stm_drm_platform_driver);
 251
 252 MODULE_AUTHOR("Philippe Cornu <[email protected]>");
 253 MODULE_AUTHOR("Yannick Fertre <[email protected]>");
 254 MODULE_AUTHOR("Fabien Dessenne <[email protected]>");
 255 MODULE_AUTHOR("Mickael Reulier <[email protected]>");
 256 MODULE_DESCRIPTION("STMicroelectronics ST DRM LTDC driver");
 257 MODULE_LICENSE("GPL v2");