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 <philippe.cornu@st.com>
   6  *          Yannick Fertre <yannick.fertre@st.com>
   7  *          Fabien Dessenne <fabien.dessenne@st.com>
   8  *          Mickael Reulier <mickael.reulier@st.com>
   9  */
  10
  11 #include <linux/aperture.h>
  12 #include <linux/component.h>
  13 #include <linux/dma-mapping.h>
  14 #include <linux/mod_devicetable.h>
  15 #include <linux/module.h>
  16 #include <linux/platform_device.h>
  17 #include <linux/pm_runtime.h>
  18
  19 #include <drm/drm_atomic.h>
  20 #include <drm/drm_atomic_helper.h>
  21 #include <drm/drm_client_setup.h>
  22 #include <drm/drm_drv.h>
  23 #include <drm/drm_fbdev_dma.h>
  24 #include <drm/drm_fourcc.h>
  25 #include <drm/drm_gem_dma_helper.h>
  26 #include <drm/drm_gem_framebuffer_helper.h>
  27 #include <drm/drm_module.h>
  28 #include <drm/drm_probe_helper.h>
  29 #include <drm/drm_vblank.h>
  30 #include <drm/drm_managed.h>
  31
  32 #include "ltdc.h"
  33
  34 #define STM_MAX_FB_WIDTH        2048
  35 #define STM_MAX_FB_HEIGHT       2048 /* same as width to handle orientation */
  36
  37 static const struct drm_mode_config_funcs drv_mode_config_funcs = {
  38         .fb_create = drm_gem_fb_create,
  39         .atomic_check = drm_atomic_helper_check,
  40         .atomic_commit = drm_atomic_helper_commit,
  41 };
  42
  43 static int stm_gem_dma_dumb_create(struct drm_file *file,
  44                                    struct drm_device *dev,
  45                                    struct drm_mode_create_dumb *args)
  46 {
  47         unsigned int min_pitch = DIV_ROUND_UP(args->width * args->bpp, 8);
  48
  49         /*
  50          * in order to optimize data transfer, pitch is aligned on
  51          * 128 bytes, height is aligned on 4 bytes
  52          */
  53         args->pitch = roundup(min_pitch, 128);
  54         args->height = roundup(args->height, 4);
  55
  56         return drm_gem_dma_dumb_create_internal(file, dev, args);
  57 }
  58
  59 DEFINE_DRM_GEM_DMA_FOPS(drv_driver_fops);
  60
  61 static const struct drm_driver drv_driver = {
  62         .driver_features = DRIVER_MODESET | DRIVER_GEM | DRIVER_ATOMIC,
  63         .name = "stm",
  64         .desc = "STMicroelectronics SoC DRM",
  65         .date = "20170330",
  66         .major = 1,
  67         .minor = 0,
  68         .patchlevel = 0,
  69         .fops = &drv_driver_fops,
  70         DRM_GEM_DMA_DRIVER_OPS_WITH_DUMB_CREATE(stm_gem_dma_dumb_create),
  71         DRM_FBDEV_DMA_DRIVER_OPS,
  72 };
  73
  74 static int drv_load(struct drm_device *ddev)
  75 {
  76         struct platform_device *pdev = to_platform_device(ddev->dev);
  77         struct ltdc_device *ldev;
  78         int ret;
  79
  80         DRM_DEBUG("%s\n", __func__);
  81
  82         ldev = drmm_kzalloc(ddev, sizeof(*ldev), GFP_KERNEL);
  83         if (!ldev)
  84                 return -ENOMEM;
  85
  86         ddev->dev_private = (void *)ldev;
  87
  88         ret = drmm_mode_config_init(ddev);
  89         if (ret)
  90                 return ret;
  91
  92         /*
  93          * set max width and height as default value.
  94          * this value would be used to check framebuffer size limitation
  95          * at drm_mode_addfb().
  96          */
  97         ddev->mode_config.min_width = 0;
  98         ddev->mode_config.min_height = 0;
  99         ddev->mode_config.max_width = STM_MAX_FB_WIDTH;
 100         ddev->mode_config.max_height = STM_MAX_FB_HEIGHT;
 101         ddev->mode_config.funcs = &drv_mode_config_funcs;
 102         ddev->mode_config.normalize_zpos = true;
 103
 104         ret = ltdc_load(ddev);
 105         if (ret)
 106                 return ret;
 107
 108         drm_mode_config_reset(ddev);
 109         drm_kms_helper_poll_init(ddev);
 110
 111         platform_set_drvdata(pdev, ddev);
 112
 113         return 0;
 114 }
 115
 116 static void drv_unload(struct drm_device *ddev)
 117 {
 118         DRM_DEBUG("%s\n", __func__);
 119
 120         drm_kms_helper_poll_fini(ddev);
 121         drm_atomic_helper_shutdown(ddev);
 122         ltdc_unload(ddev);
 123 }
 124
 125 static __maybe_unused int drv_suspend(struct device *dev)
 126 {
 127         struct drm_device *ddev = dev_get_drvdata(dev);
 128         struct ltdc_device *ldev = ddev->dev_private;
 129         struct drm_atomic_state *state;
 130
 131         WARN_ON(ldev->suspend_state);
 132
 133         state = drm_atomic_helper_suspend(ddev);
 134         if (IS_ERR(state))
 135                 return PTR_ERR(state);
 136
 137         ldev->suspend_state = state;
 138         pm_runtime_force_suspend(dev);
 139
 140         return 0;
 141 }
 142
 143 static __maybe_unused int drv_resume(struct device *dev)
 144 {
 145         struct drm_device *ddev = dev_get_drvdata(dev);
 146         struct ltdc_device *ldev = ddev->dev_private;
 147         int ret;
 148
 149         if (WARN_ON(!ldev->suspend_state))
 150                 return -ENOENT;
 151
 152         pm_runtime_force_resume(dev);
 153         ret = drm_atomic_helper_resume(ddev, ldev->suspend_state);
 154         if (ret)
 155                 pm_runtime_force_suspend(dev);
 156
 157         ldev->suspend_state = NULL;
 158
 159         return ret;
 160 }
 161
 162 static __maybe_unused int drv_runtime_suspend(struct device *dev)
 163 {
 164         struct drm_device *ddev = dev_get_drvdata(dev);
 165
 166         DRM_DEBUG_DRIVER("\n");
 167         ltdc_suspend(ddev);
 168
 169         return 0;
 170 }
 171
 172 static __maybe_unused int drv_runtime_resume(struct device *dev)
 173 {
 174         struct drm_device *ddev = dev_get_drvdata(dev);
 175
 176         DRM_DEBUG_DRIVER("\n");
 177         return ltdc_resume(ddev);
 178 }
 179
 180 static const struct dev_pm_ops drv_pm_ops = {
 181         SET_SYSTEM_SLEEP_PM_OPS(drv_suspend, drv_resume)
 182         SET_RUNTIME_PM_OPS(drv_runtime_suspend,
 183                            drv_runtime_resume, NULL)
 184 };
 185
 186 static int stm_drm_platform_probe(struct platform_device *pdev)
 187 {
 188         struct device *dev = &pdev->dev;
 189         struct drm_device *ddev;
 190         int ret;
 191
 192         DRM_DEBUG("%s\n", __func__);
 193
 194         ret = aperture_remove_all_conflicting_devices(drv_driver.name);
 195         if (ret)
 196                 return ret;
 197
 198         dma_set_coherent_mask(dev, DMA_BIT_MASK(32));
 199
 200         ddev = drm_dev_alloc(&drv_driver, dev);
 201         if (IS_ERR(ddev))
 202                 return PTR_ERR(ddev);
 203
 204         ret = drv_load(ddev);
 205         if (ret)
 206                 goto err_put;
 207
 208         ret = drm_dev_register(ddev, 0);
 209         if (ret)
 210                 goto err_unload;
 211
 212         drm_client_setup_with_fourcc(ddev, DRM_FORMAT_RGB565);
 213
 214         return 0;
 215
 216 err_unload:
 217         drv_unload(ddev);
 218 err_put:
 219         drm_dev_put(ddev);
 220
 221         return ret;
 222 }
 223
 224 static void stm_drm_platform_remove(struct platform_device *pdev)
 225 {
 226         struct drm_device *ddev = platform_get_drvdata(pdev);
 227
 228         DRM_DEBUG("%s\n", __func__);
 229
 230         drm_dev_unregister(ddev);
 231         drv_unload(ddev);
 232         drm_dev_put(ddev);
 233 }
 234
 235 static void stm_drm_platform_shutdown(struct platform_device *pdev)
 236 {
 237         drm_atomic_helper_shutdown(platform_get_drvdata(pdev));
 238 }
 239
 240 static const struct of_device_id drv_dt_ids[] = {
 241         { .compatible = "st,stm32-ltdc"},
 242         { /* end node */ },
 243 };
 244 MODULE_DEVICE_TABLE(of, drv_dt_ids);
 245
 246 static struct platform_driver stm_drm_platform_driver = {
 247         .probe = stm_drm_platform_probe,
 248         .remove = stm_drm_platform_remove,
 249         .shutdown = stm_drm_platform_shutdown,
 250         .driver = {
 251                 .name = "stm32-display",
 252                 .of_match_table = drv_dt_ids,
 253                 .pm = &drv_pm_ops,
 254         },
 255 };
 256
 257 drm_module_platform_driver(stm_drm_platform_driver);
 258
 259 MODULE_AUTHOR("Philippe Cornu <philippe.cornu@st.com>");
 260 MODULE_AUTHOR("Yannick Fertre <yannick.fertre@st.com>");
 261 MODULE_AUTHOR("Fabien Dessenne <fabien.dessenne@st.com>");
 262 MODULE_AUTHOR("Mickael Reulier <mickael.reulier@st.com>");
 263 MODULE_DESCRIPTION("STMicroelectronics ST DRM LTDC driver");
 264 MODULE_LICENSE("GPL v2");