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         ret = drmm_mode_config_init(ddev);
  92         if (ret)
  93                 return ret;
  94
  95         /*
  96          * set max width and height as default value.
  97          * this value would be used to check framebuffer size limitation
  98          * at drm_mode_addfb().
  99          */
 100         ddev->mode_config.min_width = 0;
 101         ddev->mode_config.min_height = 0;
 102         ddev->mode_config.max_width = STM_MAX_FB_WIDTH;
 103         ddev->mode_config.max_height = STM_MAX_FB_HEIGHT;
 104         ddev->mode_config.funcs = &drv_mode_config_funcs;
 105
 106         ret = ltdc_load(ddev);
 107         if (ret)
 108                 return ret;
 109
 110         drm_mode_config_reset(ddev);
 111         drm_kms_helper_poll_init(ddev);
 112
 113         platform_set_drvdata(pdev, ddev);
 114
 115         return 0;
 116 }
 117
 118 static void drv_unload(struct drm_device *ddev)
 119 {
 120         DRM_DEBUG("%s\n", __func__);
 121
 122         drm_kms_helper_poll_fini(ddev);
 123         ltdc_unload(ddev);
 124 }
 125
 126 static __maybe_unused int drv_suspend(struct device *dev)
 127 {
 128         struct drm_device *ddev = dev_get_drvdata(dev);
 129         struct ltdc_device *ldev = ddev->dev_private;
 130         struct drm_atomic_state *state;
 131
 132         WARN_ON(ldev->suspend_state);
 133
 134         state = drm_atomic_helper_suspend(ddev);
 135         if (IS_ERR(state))
 136                 return PTR_ERR(state);
 137
 138         ldev->suspend_state = state;
 139         pm_runtime_force_suspend(dev);
 140
 141         return 0;
 142 }
 143
 144 static __maybe_unused int drv_resume(struct device *dev)
 145 {
 146         struct drm_device *ddev = dev_get_drvdata(dev);
 147         struct ltdc_device *ldev = ddev->dev_private;
 148         int ret;
 149
 150         if (WARN_ON(!ldev->suspend_state))
 151                 return -ENOENT;
 152
 153         pm_runtime_force_resume(dev);
 154         ret = drm_atomic_helper_resume(ddev, ldev->suspend_state);
 155         if (ret)
 156                 pm_runtime_force_suspend(dev);
 157
 158         ldev->suspend_state = NULL;
 159
 160         return ret;
 161 }
 162
 163 static __maybe_unused int drv_runtime_suspend(struct device *dev)
 164 {
 165         struct drm_device *ddev = dev_get_drvdata(dev);
 166
 167         DRM_DEBUG_DRIVER("\n");
 168         ltdc_suspend(ddev);
 169
 170         return 0;
 171 }
 172
 173 static __maybe_unused int drv_runtime_resume(struct device *dev)
 174 {
 175         struct drm_device *ddev = dev_get_drvdata(dev);
 176
 177         DRM_DEBUG_DRIVER("\n");
 178         return ltdc_resume(ddev);
 179 }
 180
 181 static const struct dev_pm_ops drv_pm_ops = {
 182         SET_SYSTEM_SLEEP_PM_OPS(drv_suspend, drv_resume)
 183         SET_RUNTIME_PM_OPS(drv_runtime_suspend,
 184                            drv_runtime_resume, NULL)
 185 };
 186
 187 static int stm_drm_platform_probe(struct platform_device *pdev)
 188 {
 189         struct device *dev = &pdev->dev;
 190         struct drm_device *ddev;
 191         int ret;
 192
 193         DRM_DEBUG("%s\n", __func__);
 194
 195         dma_set_coherent_mask(dev, DMA_BIT_MASK(32));
 196
 197         ddev = drm_dev_alloc(&drv_driver, dev);
 198         if (IS_ERR(ddev))
 199                 return PTR_ERR(ddev);
 200
 201         ret = drv_load(ddev);
 202         if (ret)
 203                 goto err_put;
 204
 205         ret = drm_dev_register(ddev, 0);
 206         if (ret)
 207                 goto err_put;
 208
 209         drm_fbdev_generic_setup(ddev, 16);
 210
 211         return 0;
 212
 213 err_put:
 214         drm_dev_put(ddev);
 215
 216         return ret;
 217 }
 218
 219 static int stm_drm_platform_remove(struct platform_device *pdev)
 220 {
 221         struct drm_device *ddev = platform_get_drvdata(pdev);
 222
 223         DRM_DEBUG("%s\n", __func__);
 224
 225         drm_dev_unregister(ddev);
 226         drv_unload(ddev);
 227         drm_dev_put(ddev);
 228
 229         return 0;
 230 }
 231
 232 static const struct of_device_id drv_dt_ids[] = {
 233         { .compatible = "st,stm32-ltdc"},
 234         { /* end node */ },
 235 };
 236 MODULE_DEVICE_TABLE(of, drv_dt_ids);
 237
 238 static struct platform_driver stm_drm_platform_driver = {
 239         .probe = stm_drm_platform_probe,
 240         .remove = stm_drm_platform_remove,
 241         .driver = {
 242                 .name = "stm32-display",
 243                 .of_match_table = drv_dt_ids,
 244                 .pm = &drv_pm_ops,
 245         },
 246 };
 247
 248 module_platform_driver(stm_drm_platform_driver);
 249
 250 MODULE_AUTHOR("Philippe Cornu <[email protected]>");
 251 MODULE_AUTHOR("Yannick Fertre <[email protected]>");
 252 MODULE_AUTHOR("Fabien Dessenne <[email protected]>");
 253 MODULE_AUTHOR("Mickael Reulier <[email protected]>");
 254 MODULE_DESCRIPTION("STMicroelectronics ST DRM LTDC driver");
 255 MODULE_LICENSE("GPL v2");