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