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
  29 #include "ltdc.h"
  30
  31 #define STM_MAX_FB_WIDTH        2048
  32 #define STM_MAX_FB_HEIGHT       2048 /* same as width to handle orientation */
  33
  34 static const struct drm_mode_config_funcs drv_mode_config_funcs = {
  35         .fb_create = drm_gem_fb_create,
  36         .atomic_check = drm_atomic_helper_check,
  37         .atomic_commit = drm_atomic_helper_commit,
  38 };
  39
  40 static int stm_gem_dma_dumb_create(struct drm_file *file,
  41                                    struct drm_device *dev,
  42                                    struct drm_mode_create_dumb *args)
  43 {
  44         unsigned int min_pitch = DIV_ROUND_UP(args->width * args->bpp, 8);
  45
  46         /*
  47          * in order to optimize data transfer, pitch is aligned on
  48          * 128 bytes, height is aligned on 4 bytes
  49          */
  50         args->pitch = roundup(min_pitch, 128);
  51         args->height = roundup(args->height, 4);
  52
  53         return drm_gem_dma_dumb_create_internal(file, dev, args);
  54 }
  55
  56 DEFINE_DRM_GEM_DMA_FOPS(drv_driver_fops);
  57
  58 static const struct drm_driver drv_driver = {
  59         .driver_features = DRIVER_MODESET | DRIVER_GEM | DRIVER_ATOMIC,
  60         .name = "stm",
  61         .desc = "STMicroelectronics SoC DRM",
  62         .date = "20170330",
  63         .major = 1,
  64         .minor = 0,
  65         .patchlevel = 0,
  66         .fops = &drv_driver_fops,
  67         DRM_GEM_DMA_DRIVER_OPS_WITH_DUMB_CREATE(stm_gem_dma_dumb_create),
  68 };
  69
  70 static int drv_load(struct drm_device *ddev)
  71 {
  72         struct platform_device *pdev = to_platform_device(ddev->dev);
  73         struct ltdc_device *ldev;
  74         int ret;
  75
  76         DRM_DEBUG("%s\n", __func__);
  77
  78         ldev = devm_kzalloc(ddev->dev, sizeof(*ldev), GFP_KERNEL);
  79         if (!ldev)
  80                 return -ENOMEM;
  81
  82         ddev->dev_private = (void *)ldev;
  83
  84         ret = drmm_mode_config_init(ddev);
  85         if (ret)
  86                 return ret;
  87
  88         /*
  89          * set max width and height as default value.
  90          * this value would be used to check framebuffer size limitation
  91          * at drm_mode_addfb().
  92          */
  93         ddev->mode_config.min_width = 0;
  94         ddev->mode_config.min_height = 0;
  95         ddev->mode_config.max_width = STM_MAX_FB_WIDTH;
  96         ddev->mode_config.max_height = STM_MAX_FB_HEIGHT;
  97         ddev->mode_config.funcs = &drv_mode_config_funcs;
  98         ddev->mode_config.normalize_zpos = true;
  99
 100         ret = ltdc_load(ddev);
 101         if (ret)
 102                 return ret;
 103
 104         drm_mode_config_reset(ddev);
 105         drm_kms_helper_poll_init(ddev);
 106
 107         platform_set_drvdata(pdev, ddev);
 108
 109         return 0;
 110 }
 111
 112 static void drv_unload(struct drm_device *ddev)
 113 {
 114         DRM_DEBUG("%s\n", __func__);
 115
 116         drm_kms_helper_poll_fini(ddev);
 117         ltdc_unload(ddev);
 118 }
 119
 120 static __maybe_unused int drv_suspend(struct device *dev)
 121 {
 122         struct drm_device *ddev = dev_get_drvdata(dev);
 123         struct ltdc_device *ldev = ddev->dev_private;
 124         struct drm_atomic_state *state;
 125
 126         WARN_ON(ldev->suspend_state);
 127
 128         state = drm_atomic_helper_suspend(ddev);
 129         if (IS_ERR(state))
 130                 return PTR_ERR(state);
 131
 132         ldev->suspend_state = state;
 133         pm_runtime_force_suspend(dev);
 134
 135         return 0;
 136 }
 137
 138 static __maybe_unused int drv_resume(struct device *dev)
 139 {
 140         struct drm_device *ddev = dev_get_drvdata(dev);
 141         struct ltdc_device *ldev = ddev->dev_private;
 142         int ret;
 143
 144         if (WARN_ON(!ldev->suspend_state))
 145                 return -ENOENT;
 146
 147         pm_runtime_force_resume(dev);
 148         ret = drm_atomic_helper_resume(ddev, ldev->suspend_state);
 149         if (ret)
 150                 pm_runtime_force_suspend(dev);
 151
 152         ldev->suspend_state = NULL;
 153
 154         return ret;
 155 }
 156
 157 static __maybe_unused int drv_runtime_suspend(struct device *dev)
 158 {
 159         struct drm_device *ddev = dev_get_drvdata(dev);
 160
 161         DRM_DEBUG_DRIVER("\n");
 162         ltdc_suspend(ddev);
 163
 164         return 0;
 165 }
 166
 167 static __maybe_unused int drv_runtime_resume(struct device *dev)
 168 {
 169         struct drm_device *ddev = dev_get_drvdata(dev);
 170
 171         DRM_DEBUG_DRIVER("\n");
 172         return ltdc_resume(ddev);
 173 }
 174
 175 static const struct dev_pm_ops drv_pm_ops = {
 176         SET_SYSTEM_SLEEP_PM_OPS(drv_suspend, drv_resume)
 177         SET_RUNTIME_PM_OPS(drv_runtime_suspend,
 178                            drv_runtime_resume, NULL)
 179 };
 180
 181 static int stm_drm_platform_probe(struct platform_device *pdev)
 182 {
 183         struct device *dev = &pdev->dev;
 184         struct drm_device *ddev;
 185         int ret;
 186
 187         DRM_DEBUG("%s\n", __func__);
 188
 189         ret = drm_aperture_remove_framebuffers(&drv_driver);
 190         if (ret)
 191                 return ret;
 192
 193         dma_set_coherent_mask(dev, DMA_BIT_MASK(32));
 194
 195         ddev = drm_dev_alloc(&drv_driver, dev);
 196         if (IS_ERR(ddev))
 197                 return PTR_ERR(ddev);
 198
 199         ret = drv_load(ddev);
 200         if (ret)
 201                 goto err_put;
 202
 203         ret = drm_dev_register(ddev, 0);
 204         if (ret)
 205                 goto err_put;
 206
 207         drm_fbdev_dma_setup(ddev, 16);
 208
 209         return 0;
 210
 211 err_put:
 212         drm_dev_put(ddev);
 213
 214         return ret;
 215 }
 216
 217 static void stm_drm_platform_remove(struct platform_device *pdev)
 218 {
 219         struct drm_device *ddev = platform_get_drvdata(pdev);
 220
 221         DRM_DEBUG("%s\n", __func__);
 222
 223         drm_dev_unregister(ddev);
 224         drv_unload(ddev);
 225         drm_dev_put(ddev);
 226 }
 227
 228 static const struct of_device_id drv_dt_ids[] = {
 229         { .compatible = "st,stm32-ltdc"},
 230         { /* end node */ },
 231 };
 232 MODULE_DEVICE_TABLE(of, drv_dt_ids);
 233
 234 static struct platform_driver stm_drm_platform_driver = {
 235         .probe = stm_drm_platform_probe,
 236         .remove_new = stm_drm_platform_remove,
 237         .driver = {
 238                 .name = "stm32-display",
 239                 .of_match_table = drv_dt_ids,
 240                 .pm = &drv_pm_ops,
 241         },
 242 };
 243
 244 drm_module_platform_driver(stm_drm_platform_driver);
 245
 246 MODULE_AUTHOR("Philippe Cornu <[email protected]>");
 247 MODULE_AUTHOR("Yannick Fertre <[email protected]>");
 248 MODULE_AUTHOR("Fabien Dessenne <[email protected]>");
 249 MODULE_AUTHOR("Mickael Reulier <[email protected]>");
 250 MODULE_DESCRIPTION("STMicroelectronics ST DRM LTDC driver");
 251 MODULE_LICENSE("GPL v2");