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_PRIME |
  58                            DRIVER_ATOMIC,
  59         .name = "stm",
  60         .desc = "STMicroelectronics SoC DRM",
  61         .date = "20170330",
  62         .major = 1,
  63         .minor = 0,
  64         .patchlevel = 0,
  65         .fops = &drv_driver_fops,
  66         .dumb_create = stm_gem_cma_dumb_create,
  67         .prime_handle_to_fd = drm_gem_prime_handle_to_fd,
  68         .prime_fd_to_handle = drm_gem_prime_fd_to_handle,
  69         .gem_free_object_unlocked = drm_gem_cma_free_object,
  70         .gem_vm_ops = &drm_gem_cma_vm_ops,
  71         .gem_prime_export = drm_gem_prime_export,
  72         .gem_prime_import = drm_gem_prime_import,
  73         .gem_prime_get_sg_table = drm_gem_cma_prime_get_sg_table,
  74         .gem_prime_import_sg_table = drm_gem_cma_prime_import_sg_table,
  75         .gem_prime_vmap = drm_gem_cma_prime_vmap,
  76         .gem_prime_vunmap = drm_gem_cma_prime_vunmap,
  77         .gem_prime_mmap = drm_gem_cma_prime_mmap,
  78         .get_scanout_position = ltdc_crtc_scanoutpos,
  79         .get_vblank_timestamp = drm_calc_vbltimestamp_from_scanoutpos,
  80 };
  81
  82 static int drv_load(struct drm_device *ddev)
  83 {
  84         struct platform_device *pdev = to_platform_device(ddev->dev);
  85         struct ltdc_device *ldev;
  86         int ret;
  87
  88         DRM_DEBUG("%s\n", __func__);
  89
  90         ldev = devm_kzalloc(ddev->dev, sizeof(*ldev), GFP_KERNEL);
  91         if (!ldev)
  92                 return -ENOMEM;
  93
  94         ddev->dev_private = (void *)ldev;
  95
  96         drm_mode_config_init(ddev);
  97
  98         /*
  99          * set max width and height as default value.
 100          * this value would be used to check framebuffer size limitation
 101          * at drm_mode_addfb().
 102          */
 103         ddev->mode_config.min_width = 0;
 104         ddev->mode_config.min_height = 0;
 105         ddev->mode_config.max_width = STM_MAX_FB_WIDTH;
 106         ddev->mode_config.max_height = STM_MAX_FB_HEIGHT;
 107         ddev->mode_config.funcs = &drv_mode_config_funcs;
 108
 109         ret = ltdc_load(ddev);
 110         if (ret)
 111                 goto err;
 112
 113         drm_mode_config_reset(ddev);
 114         drm_kms_helper_poll_init(ddev);
 115
 116         platform_set_drvdata(pdev, ddev);
 117
 118         return 0;
 119 err:
 120         drm_mode_config_cleanup(ddev);
 121         return ret;
 122 }
 123
 124 static void drv_unload(struct drm_device *ddev)
 125 {
 126         DRM_DEBUG("%s\n", __func__);
 127
 128         drm_kms_helper_poll_fini(ddev);
 129         ltdc_unload(ddev);
 130         drm_mode_config_cleanup(ddev);
 131 }
 132
 133 static __maybe_unused int drv_suspend(struct device *dev)
 134 {
 135         struct drm_device *ddev = dev_get_drvdata(dev);
 136         struct ltdc_device *ldev = ddev->dev_private;
 137         struct drm_atomic_state *state;
 138
 139         WARN_ON(ldev->suspend_state);
 140
 141         state = drm_atomic_helper_suspend(ddev);
 142         if (IS_ERR(state))
 143                 return PTR_ERR(state);
 144
 145         ldev->suspend_state = state;
 146         pm_runtime_force_suspend(dev);
 147
 148         return 0;
 149 }
 150
 151 static __maybe_unused int drv_resume(struct device *dev)
 152 {
 153         struct drm_device *ddev = dev_get_drvdata(dev);
 154         struct ltdc_device *ldev = ddev->dev_private;
 155         int ret;
 156
 157         if (WARN_ON(!ldev->suspend_state))
 158                 return -ENOENT;
 159
 160         pm_runtime_force_resume(dev);
 161         ret = drm_atomic_helper_resume(ddev, ldev->suspend_state);
 162         if (ret)
 163                 pm_runtime_force_suspend(dev);
 164
 165         ldev->suspend_state = NULL;
 166
 167         return ret;
 168 }
 169
 170 static __maybe_unused int drv_runtime_suspend(struct device *dev)
 171 {
 172         struct drm_device *ddev = dev_get_drvdata(dev);
 173
 174         DRM_DEBUG_DRIVER("\n");
 175         ltdc_suspend(ddev);
 176
 177         return 0;
 178 }
 179
 180 static __maybe_unused int drv_runtime_resume(struct device *dev)
 181 {
 182         struct drm_device *ddev = dev_get_drvdata(dev);
 183
 184         DRM_DEBUG_DRIVER("\n");
 185         return ltdc_resume(ddev);
 186 }
 187
 188 static const struct dev_pm_ops drv_pm_ops = {
 189         SET_SYSTEM_SLEEP_PM_OPS(drv_suspend, drv_resume)
 190         SET_RUNTIME_PM_OPS(drv_runtime_suspend,
 191                            drv_runtime_resume, NULL)
 192 };
 193
 194 static int stm_drm_platform_probe(struct platform_device *pdev)
 195 {
 196         struct device *dev = &pdev->dev;
 197         struct drm_device *ddev;
 198         int ret;
 199
 200         DRM_DEBUG("%s\n", __func__);
 201
 202         dma_set_coherent_mask(dev, DMA_BIT_MASK(32));
 203
 204         ddev = drm_dev_alloc(&drv_driver, dev);
 205         if (IS_ERR(ddev))
 206                 return PTR_ERR(ddev);
 207
 208         ret = drv_load(ddev);
 209         if (ret)
 210                 goto err_put;
 211
 212         ret = drm_dev_register(ddev, 0);
 213         if (ret)
 214                 goto err_put;
 215
 216         drm_fbdev_generic_setup(ddev, 16);
 217
 218         return 0;
 219
 220 err_put:
 221         drm_dev_put(ddev);
 222
 223         return ret;
 224 }
 225
 226 static int stm_drm_platform_remove(struct platform_device *pdev)
 227 {
 228         struct drm_device *ddev = platform_get_drvdata(pdev);
 229
 230         DRM_DEBUG("%s\n", __func__);
 231
 232         drm_dev_unregister(ddev);
 233         drv_unload(ddev);
 234         drm_dev_put(ddev);
 235
 236         return 0;
 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         .driver = {
 249                 .name = "stm32-display",
 250                 .of_match_table = drv_dt_ids,
 251                 .pm = &drv_pm_ops,
 252         },
 253 };
 254
 255 module_platform_driver(stm_drm_platform_driver);
 256
 257 MODULE_AUTHOR("Philippe Cornu <[email protected]>");
 258 MODULE_AUTHOR("Yannick Fertre <[email protected]>");
 259 MODULE_AUTHOR("Fabien Dessenne <[email protected]>");
 260 MODULE_AUTHOR("Mickael Reulier <[email protected]>");
 261 MODULE_DESCRIPTION("STMicroelectronics ST DRM LTDC driver");
 262 MODULE_LICENSE("GPL v2");