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 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         .dumb_create = stm_gem_cma_dumb_create,
  66         .prime_handle_to_fd = drm_gem_prime_handle_to_fd,
  67         .prime_fd_to_handle = drm_gem_prime_fd_to_handle,
  68         .gem_free_object_unlocked = drm_gem_cma_free_object,
  69         .gem_vm_ops = &drm_gem_cma_vm_ops,
  70         .gem_prime_get_sg_table = drm_gem_cma_prime_get_sg_table,
  71         .gem_prime_import_sg_table = drm_gem_cma_prime_import_sg_table,
  72         .gem_prime_vmap = drm_gem_cma_prime_vmap,
  73         .gem_prime_vunmap = drm_gem_cma_prime_vunmap,
  74         .gem_prime_mmap = drm_gem_cma_prime_mmap,
  75         .get_scanout_position = ltdc_crtc_scanoutpos,
  76         .get_vblank_timestamp = drm_calc_vbltimestamp_from_scanoutpos,
  77 };
  78
  79 static int drv_load(struct drm_device *ddev)
  80 {
  81         struct platform_device *pdev = to_platform_device(ddev->dev);
  82         struct ltdc_device *ldev;
  83         int ret;
  84
  85         DRM_DEBUG("%s\n", __func__);
  86
  87         ldev = devm_kzalloc(ddev->dev, sizeof(*ldev), GFP_KERNEL);
  88         if (!ldev)
  89                 return -ENOMEM;
  90
  91         ddev->dev_private = (void *)ldev;
  92
  93         drm_mode_config_init(ddev);
  94
  95         /*
  96          * set max width and height as default value.
  97          * this value would be used to check framebuffer size limitation
  98          * at drm_mode_addfb().
  99          */
 100         ddev->mode_config.min_width = 0;
 101         ddev->mode_config.min_height = 0;
 102         ddev->mode_config.max_width = STM_MAX_FB_WIDTH;
 103         ddev->mode_config.max_height = STM_MAX_FB_HEIGHT;
 104         ddev->mode_config.funcs = &drv_mode_config_funcs;
 105
 106         ret = ltdc_load(ddev);
 107         if (ret)
 108                 goto err;
 109
 110         drm_mode_config_reset(ddev);
 111         drm_kms_helper_poll_init(ddev);
 112
 113         platform_set_drvdata(pdev, ddev);
 114
 115         return 0;
 116 err:
 117         drm_mode_config_cleanup(ddev);
 118         return ret;
 119 }
 120
 121 static void drv_unload(struct drm_device *ddev)
 122 {
 123         DRM_DEBUG("%s\n", __func__);
 124
 125         drm_kms_helper_poll_fini(ddev);
 126         ltdc_unload(ddev);
 127         drm_mode_config_cleanup(ddev);
 128 }
 129
 130 static __maybe_unused int drv_suspend(struct device *dev)
 131 {
 132         struct drm_device *ddev = dev_get_drvdata(dev);
 133         struct ltdc_device *ldev = ddev->dev_private;
 134         struct drm_atomic_state *state;
 135
 136         WARN_ON(ldev->suspend_state);
 137
 138         state = drm_atomic_helper_suspend(ddev);
 139         if (IS_ERR(state))
 140                 return PTR_ERR(state);
 141
 142         ldev->suspend_state = state;
 143         pm_runtime_force_suspend(dev);
 144
 145         return 0;
 146 }
 147
 148 static __maybe_unused int drv_resume(struct device *dev)
 149 {
 150         struct drm_device *ddev = dev_get_drvdata(dev);
 151         struct ltdc_device *ldev = ddev->dev_private;
 152         int ret;
 153
 154         if (WARN_ON(!ldev->suspend_state))
 155                 return -ENOENT;
 156
 157         pm_runtime_force_resume(dev);
 158         ret = drm_atomic_helper_resume(ddev, ldev->suspend_state);
 159         if (ret)
 160                 pm_runtime_force_suspend(dev);
 161
 162         ldev->suspend_state = NULL;
 163
 164         return ret;
 165 }
 166
 167 static __maybe_unused int drv_runtime_suspend(struct device *dev)
 168 {
 169         struct drm_device *ddev = dev_get_drvdata(dev);
 170
 171         DRM_DEBUG_DRIVER("\n");
 172         ltdc_suspend(ddev);
 173
 174         return 0;
 175 }
 176
 177 static __maybe_unused int drv_runtime_resume(struct device *dev)
 178 {
 179         struct drm_device *ddev = dev_get_drvdata(dev);
 180
 181         DRM_DEBUG_DRIVER("\n");
 182         return ltdc_resume(ddev);
 183 }
 184
 185 static const struct dev_pm_ops drv_pm_ops = {
 186         SET_SYSTEM_SLEEP_PM_OPS(drv_suspend, drv_resume)
 187         SET_RUNTIME_PM_OPS(drv_runtime_suspend,
 188                            drv_runtime_resume, NULL)
 189 };
 190
 191 static int stm_drm_platform_probe(struct platform_device *pdev)
 192 {
 193         struct device *dev = &pdev->dev;
 194         struct drm_device *ddev;
 195         int ret;
 196
 197         DRM_DEBUG("%s\n", __func__);
 198
 199         dma_set_coherent_mask(dev, DMA_BIT_MASK(32));
 200
 201         ddev = drm_dev_alloc(&drv_driver, dev);
 202         if (IS_ERR(ddev))
 203                 return PTR_ERR(ddev);
 204
 205         ret = drv_load(ddev);
 206         if (ret)
 207                 goto err_put;
 208
 209         ret = drm_dev_register(ddev, 0);
 210         if (ret)
 211                 goto err_put;
 212
 213         drm_fbdev_generic_setup(ddev, 16);
 214
 215         return 0;
 216
 217 err_put:
 218         drm_dev_put(ddev);
 219
 220         return ret;
 221 }
 222
 223 static int stm_drm_platform_remove(struct platform_device *pdev)
 224 {
 225         struct drm_device *ddev = platform_get_drvdata(pdev);
 226
 227         DRM_DEBUG("%s\n", __func__);
 228
 229         drm_dev_unregister(ddev);
 230         drv_unload(ddev);
 231         drm_dev_put(ddev);
 232
 233         return 0;
 234 }
 235
 236 static const struct of_device_id drv_dt_ids[] = {
 237         { .compatible = "st,stm32-ltdc"},
 238         { /* end node */ },
 239 };
 240 MODULE_DEVICE_TABLE(of, drv_dt_ids);
 241
 242 static struct platform_driver stm_drm_platform_driver = {
 243         .probe = stm_drm_platform_probe,
 244         .remove = stm_drm_platform_remove,
 245         .driver = {
 246                 .name = "stm32-display",
 247                 .of_match_table = drv_dt_ids,
 248                 .pm = &drv_pm_ops,
 249         },
 250 };
 251
 252 module_platform_driver(stm_drm_platform_driver);
 253
 254 MODULE_AUTHOR("Philippe Cornu <philippe.cornu@st.com>");
 255 MODULE_AUTHOR("Yannick Fertre <yannick.fertre@st.com>");
 256 MODULE_AUTHOR("Fabien Dessenne <fabien.dessenne@st.com>");
 257 MODULE_AUTHOR("Mickael Reulier <mickael.reulier@st.com>");
 258 MODULE_DESCRIPTION("STMicroelectronics ST DRM LTDC driver");
 259 MODULE_LICENSE("GPL v2");