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         drm_atomic_helper_shutdown(ddev);
 118         ltdc_unload(ddev);
 119 }
 120
 121 static __maybe_unused int drv_suspend(struct device *dev)
 122 {
 123         struct drm_device *ddev = dev_get_drvdata(dev);
 124         struct ltdc_device *ldev = ddev->dev_private;
 125         struct drm_atomic_state *state;
 126
 127         WARN_ON(ldev->suspend_state);
 128
 129         state = drm_atomic_helper_suspend(ddev);
 130         if (IS_ERR(state))
 131                 return PTR_ERR(state);
 132
 133         ldev->suspend_state = state;
 134         pm_runtime_force_suspend(dev);
 135
 136         return 0;
 137 }
 138
 139 static __maybe_unused int drv_resume(struct device *dev)
 140 {
 141         struct drm_device *ddev = dev_get_drvdata(dev);
 142         struct ltdc_device *ldev = ddev->dev_private;
 143         int ret;
 144
 145         if (WARN_ON(!ldev->suspend_state))
 146                 return -ENOENT;
 147
 148         pm_runtime_force_resume(dev);
 149         ret = drm_atomic_helper_resume(ddev, ldev->suspend_state);
 150         if (ret)
 151                 pm_runtime_force_suspend(dev);
 152
 153         ldev->suspend_state = NULL;
 154
 155         return ret;
 156 }
 157
 158 static __maybe_unused int drv_runtime_suspend(struct device *dev)
 159 {
 160         struct drm_device *ddev = dev_get_drvdata(dev);
 161
 162         DRM_DEBUG_DRIVER("\n");
 163         ltdc_suspend(ddev);
 164
 165         return 0;
 166 }
 167
 168 static __maybe_unused int drv_runtime_resume(struct device *dev)
 169 {
 170         struct drm_device *ddev = dev_get_drvdata(dev);
 171
 172         DRM_DEBUG_DRIVER("\n");
 173         return ltdc_resume(ddev);
 174 }
 175
 176 static const struct dev_pm_ops drv_pm_ops = {
 177         SET_SYSTEM_SLEEP_PM_OPS(drv_suspend, drv_resume)
 178         SET_RUNTIME_PM_OPS(drv_runtime_suspend,
 179                            drv_runtime_resume, NULL)
 180 };
 181
 182 static int stm_drm_platform_probe(struct platform_device *pdev)
 183 {
 184         struct device *dev = &pdev->dev;
 185         struct drm_device *ddev;
 186         int ret;
 187
 188         DRM_DEBUG("%s\n", __func__);
 189
 190         ret = drm_aperture_remove_framebuffers(&drv_driver);
 191         if (ret)
 192                 return ret;
 193
 194         dma_set_coherent_mask(dev, DMA_BIT_MASK(32));
 195
 196         ddev = drm_dev_alloc(&drv_driver, dev);
 197         if (IS_ERR(ddev))
 198                 return PTR_ERR(ddev);
 199
 200         ret = drv_load(ddev);
 201         if (ret)
 202                 goto err_put;
 203
 204         ret = drm_dev_register(ddev, 0);
 205         if (ret)
 206                 goto err_put;
 207
 208         drm_fbdev_dma_setup(ddev, 16);
 209
 210         return 0;
 211
 212 err_put:
 213         drm_dev_put(ddev);
 214
 215         return ret;
 216 }
 217
 218 static void stm_drm_platform_remove(struct platform_device *pdev)
 219 {
 220         struct drm_device *ddev = platform_get_drvdata(pdev);
 221
 222         DRM_DEBUG("%s\n", __func__);
 223
 224         drm_dev_unregister(ddev);
 225         drv_unload(ddev);
 226         drm_dev_put(ddev);
 227 }
 228
 229 static void stm_drm_platform_shutdown(struct platform_device *pdev)
 230 {
 231         drm_atomic_helper_shutdown(platform_get_drvdata(pdev));
 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_new = stm_drm_platform_remove,
 243         .shutdown = stm_drm_platform_shutdown,
 244         .driver = {
 245                 .name = "stm32-display",
 246                 .of_match_table = drv_dt_ids,
 247                 .pm = &drv_pm_ops,
 248         },
 249 };
 250
 251 drm_module_platform_driver(stm_drm_platform_driver);
 252
 253 MODULE_AUTHOR("Philippe Cornu <[email protected]>");
 254 MODULE_AUTHOR("Yannick Fertre <[email protected]>");
 255 MODULE_AUTHOR("Fabien Dessenne <[email protected]>");
 256 MODULE_AUTHOR("Mickael Reulier <[email protected]>");
 257 MODULE_DESCRIPTION("STMicroelectronics ST DRM LTDC driver");
 258 MODULE_LICENSE("GPL v2");