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/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 const struct drm_driver drv_driver = {
  57         .driver_features = DRIVER_MODESET | DRIVER_GEM | DRIVER_ATOMIC,
  58         .name = "stm",
  59         .desc = "STMicroelectronics SoC DRM",
  60         .date = "20170330",
  61         .major = 1,
  62         .minor = 0,
  63         .patchlevel = 0,
  64         .fops = &drv_driver_fops,
  65         DRM_GEM_CMA_DRIVER_OPS_WITH_DUMB_CREATE(stm_gem_cma_dumb_create),
  66 };
  67
  68 static int drv_load(struct drm_device *ddev)
  69 {
  70         struct platform_device *pdev = to_platform_device(ddev->dev);
  71         struct ltdc_device *ldev;
  72         int ret;
  73
  74         DRM_DEBUG("%s\n", __func__);
  75
  76         ldev = devm_kzalloc(ddev->dev, sizeof(*ldev), GFP_KERNEL);
  77         if (!ldev)
  78                 return -ENOMEM;
  79
  80         ddev->dev_private = (void *)ldev;
  81
  82         ret = drmm_mode_config_init(ddev);
  83         if (ret)
  84                 return ret;
  85
  86         /*
  87          * set max width and height as default value.
  88          * this value would be used to check framebuffer size limitation
  89          * at drm_mode_addfb().
  90          */
  91         ddev->mode_config.min_width = 0;
  92         ddev->mode_config.min_height = 0;
  93         ddev->mode_config.max_width = STM_MAX_FB_WIDTH;
  94         ddev->mode_config.max_height = STM_MAX_FB_HEIGHT;
  95         ddev->mode_config.funcs = &drv_mode_config_funcs;
  96
  97         ret = ltdc_load(ddev);
  98         if (ret)
  99                 return ret;
 100
 101         drm_mode_config_reset(ddev);
 102         drm_kms_helper_poll_init(ddev);
 103
 104         platform_set_drvdata(pdev, ddev);
 105
 106         return 0;
 107 }
 108
 109 static void drv_unload(struct drm_device *ddev)
 110 {
 111         DRM_DEBUG("%s\n", __func__);
 112
 113         drm_kms_helper_poll_fini(ddev);
 114         ltdc_unload(ddev);
 115 }
 116
 117 static __maybe_unused int drv_suspend(struct device *dev)
 118 {
 119         struct drm_device *ddev = dev_get_drvdata(dev);
 120         struct ltdc_device *ldev = ddev->dev_private;
 121         struct drm_atomic_state *state;
 122
 123         WARN_ON(ldev->suspend_state);
 124
 125         state = drm_atomic_helper_suspend(ddev);
 126         if (IS_ERR(state))
 127                 return PTR_ERR(state);
 128
 129         ldev->suspend_state = state;
 130         pm_runtime_force_suspend(dev);
 131
 132         return 0;
 133 }
 134
 135 static __maybe_unused int drv_resume(struct device *dev)
 136 {
 137         struct drm_device *ddev = dev_get_drvdata(dev);
 138         struct ltdc_device *ldev = ddev->dev_private;
 139         int ret;
 140
 141         if (WARN_ON(!ldev->suspend_state))
 142                 return -ENOENT;
 143
 144         pm_runtime_force_resume(dev);
 145         ret = drm_atomic_helper_resume(ddev, ldev->suspend_state);
 146         if (ret)
 147                 pm_runtime_force_suspend(dev);
 148
 149         ldev->suspend_state = NULL;
 150
 151         return ret;
 152 }
 153
 154 static __maybe_unused int drv_runtime_suspend(struct device *dev)
 155 {
 156         struct drm_device *ddev = dev_get_drvdata(dev);
 157
 158         DRM_DEBUG_DRIVER("\n");
 159         ltdc_suspend(ddev);
 160
 161         return 0;
 162 }
 163
 164 static __maybe_unused int drv_runtime_resume(struct device *dev)
 165 {
 166         struct drm_device *ddev = dev_get_drvdata(dev);
 167
 168         DRM_DEBUG_DRIVER("\n");
 169         return ltdc_resume(ddev);
 170 }
 171
 172 static const struct dev_pm_ops drv_pm_ops = {
 173         SET_SYSTEM_SLEEP_PM_OPS(drv_suspend, drv_resume)
 174         SET_RUNTIME_PM_OPS(drv_runtime_suspend,
 175                            drv_runtime_resume, NULL)
 176 };
 177
 178 static int stm_drm_platform_probe(struct platform_device *pdev)
 179 {
 180         struct device *dev = &pdev->dev;
 181         struct drm_device *ddev;
 182         int ret;
 183
 184         DRM_DEBUG("%s\n", __func__);
 185
 186         dma_set_coherent_mask(dev, DMA_BIT_MASK(32));
 187
 188         ddev = drm_dev_alloc(&drv_driver, dev);
 189         if (IS_ERR(ddev))
 190                 return PTR_ERR(ddev);
 191
 192         ret = drv_load(ddev);
 193         if (ret)
 194                 goto err_put;
 195
 196         ret = drm_dev_register(ddev, 0);
 197         if (ret)
 198                 goto err_put;
 199
 200         drm_fbdev_generic_setup(ddev, 16);
 201
 202         return 0;
 203
 204 err_put:
 205         drm_dev_put(ddev);
 206
 207         return ret;
 208 }
 209
 210 static int stm_drm_platform_remove(struct platform_device *pdev)
 211 {
 212         struct drm_device *ddev = platform_get_drvdata(pdev);
 213
 214         DRM_DEBUG("%s\n", __func__);
 215
 216         drm_dev_unregister(ddev);
 217         drv_unload(ddev);
 218         drm_dev_put(ddev);
 219
 220         return 0;
 221 }
 222
 223 static const struct of_device_id drv_dt_ids[] = {
 224         { .compatible = "st,stm32-ltdc"},
 225         { /* end node */ },
 226 };
 227 MODULE_DEVICE_TABLE(of, drv_dt_ids);
 228
 229 static struct platform_driver stm_drm_platform_driver = {
 230         .probe = stm_drm_platform_probe,
 231         .remove = stm_drm_platform_remove,
 232         .driver = {
 233                 .name = "stm32-display",
 234                 .of_match_table = drv_dt_ids,
 235                 .pm = &drv_pm_ops,
 236         },
 237 };
 238
 239 module_platform_driver(stm_drm_platform_driver);
 240
 241 MODULE_AUTHOR("Philippe Cornu <philippe.cornu@st.com>");
 242 MODULE_AUTHOR("Yannick Fertre <yannick.fertre@st.com>");
 243 MODULE_AUTHOR("Fabien Dessenne <fabien.dessenne@st.com>");
 244 MODULE_AUTHOR("Mickael Reulier <mickael.reulier@st.com>");
 245 MODULE_DESCRIPTION("STMicroelectronics ST DRM LTDC driver");
 246 MODULE_LICENSE("GPL v2");