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/mod_devicetable.h>
  14 #include <linux/module.h>
  15 #include <linux/platform_device.h>
  16 #include <linux/pm_runtime.h>
  17
  18 #include <drm/drm_aperture.h>
  19 #include <drm/drm_atomic.h>
  20 #include <drm/drm_atomic_helper.h>
  21 #include <drm/drm_drv.h>
  22 #include <drm/drm_fbdev_dma.h>
  23 #include <drm/drm_gem_dma_helper.h>
  24 #include <drm/drm_gem_framebuffer_helper.h>
  25 #include <drm/drm_module.h>
  26 #include <drm/drm_probe_helper.h>
  27 #include <drm/drm_vblank.h>
  28 #include <drm/drm_managed.h>
  29
  30 #include "ltdc.h"
  31
  32 #define STM_MAX_FB_WIDTH        2048
  33 #define STM_MAX_FB_HEIGHT       2048 /* same as width to handle orientation */
  34
  35 static const struct drm_mode_config_funcs drv_mode_config_funcs = {
  36         .fb_create = drm_gem_fb_create,
  37         .atomic_check = drm_atomic_helper_check,
  38         .atomic_commit = drm_atomic_helper_commit,
  39 };
  40
  41 static int stm_gem_dma_dumb_create(struct drm_file *file,
  42                                    struct drm_device *dev,
  43                                    struct drm_mode_create_dumb *args)
  44 {
  45         unsigned int min_pitch = DIV_ROUND_UP(args->width * args->bpp, 8);
  46
  47         /*
  48          * in order to optimize data transfer, pitch is aligned on
  49          * 128 bytes, height is aligned on 4 bytes
  50          */
  51         args->pitch = roundup(min_pitch, 128);
  52         args->height = roundup(args->height, 4);
  53
  54         return drm_gem_dma_dumb_create_internal(file, dev, args);
  55 }
  56
  57 DEFINE_DRM_GEM_DMA_FOPS(drv_driver_fops);
  58
  59 static const struct drm_driver drv_driver = {
  60         .driver_features = DRIVER_MODESET | DRIVER_GEM | DRIVER_ATOMIC,
  61         .name = "stm",
  62         .desc = "STMicroelectronics SoC DRM",
  63         .date = "20170330",
  64         .major = 1,
  65         .minor = 0,
  66         .patchlevel = 0,
  67         .fops = &drv_driver_fops,
  68         DRM_GEM_DMA_DRIVER_OPS_WITH_DUMB_CREATE(stm_gem_dma_dumb_create),
  69 };
  70
  71 static int drv_load(struct drm_device *ddev)
  72 {
  73         struct platform_device *pdev = to_platform_device(ddev->dev);
  74         struct ltdc_device *ldev;
  75         int ret;
  76
  77         DRM_DEBUG("%s\n", __func__);
  78
  79         ldev = drmm_kzalloc(ddev, sizeof(*ldev), GFP_KERNEL);
  80         if (!ldev)
  81                 return -ENOMEM;
  82
  83         ddev->dev_private = (void *)ldev;
  84
  85         ret = drmm_mode_config_init(ddev);
  86         if (ret)
  87                 return ret;
  88
  89         /*
  90          * set max width and height as default value.
  91          * this value would be used to check framebuffer size limitation
  92          * at drm_mode_addfb().
  93          */
  94         ddev->mode_config.min_width = 0;
  95         ddev->mode_config.min_height = 0;
  96         ddev->mode_config.max_width = STM_MAX_FB_WIDTH;
  97         ddev->mode_config.max_height = STM_MAX_FB_HEIGHT;
  98         ddev->mode_config.funcs = &drv_mode_config_funcs;
  99         ddev->mode_config.normalize_zpos = true;
 100
 101         ret = ltdc_load(ddev);
 102         if (ret)
 103                 return ret;
 104
 105         drm_mode_config_reset(ddev);
 106         drm_kms_helper_poll_init(ddev);
 107
 108         platform_set_drvdata(pdev, ddev);
 109
 110         return 0;
 111 }
 112
 113 static void drv_unload(struct drm_device *ddev)
 114 {
 115         DRM_DEBUG("%s\n", __func__);
 116
 117         drm_kms_helper_poll_fini(ddev);
 118         drm_atomic_helper_shutdown(ddev);
 119         ltdc_unload(ddev);
 120 }
 121
 122 static __maybe_unused int drv_suspend(struct device *dev)
 123 {
 124         struct drm_device *ddev = dev_get_drvdata(dev);
 125         struct ltdc_device *ldev = ddev->dev_private;
 126         struct drm_atomic_state *state;
 127
 128         WARN_ON(ldev->suspend_state);
 129
 130         state = drm_atomic_helper_suspend(ddev);
 131         if (IS_ERR(state))
 132                 return PTR_ERR(state);
 133
 134         ldev->suspend_state = state;
 135         pm_runtime_force_suspend(dev);
 136
 137         return 0;
 138 }
 139
 140 static __maybe_unused int drv_resume(struct device *dev)
 141 {
 142         struct drm_device *ddev = dev_get_drvdata(dev);
 143         struct ltdc_device *ldev = ddev->dev_private;
 144         int ret;
 145
 146         if (WARN_ON(!ldev->suspend_state))
 147                 return -ENOENT;
 148
 149         pm_runtime_force_resume(dev);
 150         ret = drm_atomic_helper_resume(ddev, ldev->suspend_state);
 151         if (ret)
 152                 pm_runtime_force_suspend(dev);
 153
 154         ldev->suspend_state = NULL;
 155
 156         return ret;
 157 }
 158
 159 static __maybe_unused int drv_runtime_suspend(struct device *dev)
 160 {
 161         struct drm_device *ddev = dev_get_drvdata(dev);
 162
 163         DRM_DEBUG_DRIVER("\n");
 164         ltdc_suspend(ddev);
 165
 166         return 0;
 167 }
 168
 169 static __maybe_unused int drv_runtime_resume(struct device *dev)
 170 {
 171         struct drm_device *ddev = dev_get_drvdata(dev);
 172
 173         DRM_DEBUG_DRIVER("\n");
 174         return ltdc_resume(ddev);
 175 }
 176
 177 static const struct dev_pm_ops drv_pm_ops = {
 178         SET_SYSTEM_SLEEP_PM_OPS(drv_suspend, drv_resume)
 179         SET_RUNTIME_PM_OPS(drv_runtime_suspend,
 180                            drv_runtime_resume, NULL)
 181 };
 182
 183 static int stm_drm_platform_probe(struct platform_device *pdev)
 184 {
 185         struct device *dev = &pdev->dev;
 186         struct drm_device *ddev;
 187         int ret;
 188
 189         DRM_DEBUG("%s\n", __func__);
 190
 191         ret = drm_aperture_remove_framebuffers(&drv_driver);
 192         if (ret)
 193                 return ret;
 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_unload;
 208
 209         drm_fbdev_dma_setup(ddev, 16);
 210
 211         return 0;
 212
 213 err_unload:
 214         drv_unload(ddev);
 215 err_put:
 216         drm_dev_put(ddev);
 217
 218         return ret;
 219 }
 220
 221 static void 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
 232 static void stm_drm_platform_shutdown(struct platform_device *pdev)
 233 {
 234         drm_atomic_helper_shutdown(platform_get_drvdata(pdev));
 235 }
 236
 237 static const struct of_device_id drv_dt_ids[] = {
 238         { .compatible = "st,stm32-ltdc"},
 239         { /* end node */ },
 240 };
 241 MODULE_DEVICE_TABLE(of, drv_dt_ids);
 242
 243 static struct platform_driver stm_drm_platform_driver = {
 244         .probe = stm_drm_platform_probe,
 245         .remove_new = stm_drm_platform_remove,
 246         .shutdown = stm_drm_platform_shutdown,
 247         .driver = {
 248                 .name = "stm32-display",
 249                 .of_match_table = drv_dt_ids,
 250                 .pm = &drv_pm_ops,
 251         },
 252 };
 253
 254 drm_module_platform_driver(stm_drm_platform_driver);
 255
 256 MODULE_AUTHOR("Philippe Cornu <[email protected]>");
 257 MODULE_AUTHOR("Yannick Fertre <[email protected]>");
 258 MODULE_AUTHOR("Fabien Dessenne <[email protected]>");
 259 MODULE_AUTHOR("Mickael Reulier <[email protected]>");
 260 MODULE_DESCRIPTION("STMicroelectronics ST DRM LTDC driver");
 261 MODULE_LICENSE("GPL v2");