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_fb_helper.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(false, &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_generic_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"); 253