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 }; 76 77 static int drv_load(struct drm_device *ddev) 78 { 79 struct platform_device *pdev = to_platform_device(ddev->dev); 80 struct ltdc_device *ldev; 81 int ret; 82 83 DRM_DEBUG("%s\n", __func__); 84 85 ldev = devm_kzalloc(ddev->dev, sizeof(*ldev), GFP_KERNEL); 86 if (!ldev) 87 return -ENOMEM; 88 89 ddev->dev_private = (void *)ldev; 90 91 ret = drmm_mode_config_init(ddev); 92 if (ret) 93 return ret; 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 return ret; 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 } 117 118 static void drv_unload(struct drm_device *ddev) 119 { 120 DRM_DEBUG("%s\n", __func__); 121 122 drm_kms_helper_poll_fini(ddev); 123 ltdc_unload(ddev); 124 } 125 126 static __maybe_unused int drv_suspend(struct device *dev) 127 { 128 struct drm_device *ddev = dev_get_drvdata(dev); 129 struct ltdc_device *ldev = ddev->dev_private; 130 struct drm_atomic_state *state; 131 132 WARN_ON(ldev->suspend_state); 133 134 state = drm_atomic_helper_suspend(ddev); 135 if (IS_ERR(state)) 136 return PTR_ERR(state); 137 138 ldev->suspend_state = state; 139 pm_runtime_force_suspend(dev); 140 141 return 0; 142 } 143 144 static __maybe_unused int drv_resume(struct device *dev) 145 { 146 struct drm_device *ddev = dev_get_drvdata(dev); 147 struct ltdc_device *ldev = ddev->dev_private; 148 int ret; 149 150 if (WARN_ON(!ldev->suspend_state)) 151 return -ENOENT; 152 153 pm_runtime_force_resume(dev); 154 ret = drm_atomic_helper_resume(ddev, ldev->suspend_state); 155 if (ret) 156 pm_runtime_force_suspend(dev); 157 158 ldev->suspend_state = NULL; 159 160 return ret; 161 } 162 163 static __maybe_unused int drv_runtime_suspend(struct device *dev) 164 { 165 struct drm_device *ddev = dev_get_drvdata(dev); 166 167 DRM_DEBUG_DRIVER("\n"); 168 ltdc_suspend(ddev); 169 170 return 0; 171 } 172 173 static __maybe_unused int drv_runtime_resume(struct device *dev) 174 { 175 struct drm_device *ddev = dev_get_drvdata(dev); 176 177 DRM_DEBUG_DRIVER("\n"); 178 return ltdc_resume(ddev); 179 } 180 181 static const struct dev_pm_ops drv_pm_ops = { 182 SET_SYSTEM_SLEEP_PM_OPS(drv_suspend, drv_resume) 183 SET_RUNTIME_PM_OPS(drv_runtime_suspend, 184 drv_runtime_resume, NULL) 185 }; 186 187 static int stm_drm_platform_probe(struct platform_device *pdev) 188 { 189 struct device *dev = &pdev->dev; 190 struct drm_device *ddev; 191 int ret; 192 193 DRM_DEBUG("%s\n", __func__); 194 195 dma_set_coherent_mask(dev, DMA_BIT_MASK(32)); 196 197 ddev = drm_dev_alloc(&drv_driver, dev); 198 if (IS_ERR(ddev)) 199 return PTR_ERR(ddev); 200 201 ret = drv_load(ddev); 202 if (ret) 203 goto err_put; 204 205 ret = drm_dev_register(ddev, 0); 206 if (ret) 207 goto err_put; 208 209 drm_fbdev_generic_setup(ddev, 16); 210 211 return 0; 212 213 err_put: 214 drm_dev_put(ddev); 215 216 return ret; 217 } 218 219 static int stm_drm_platform_remove(struct platform_device *pdev) 220 { 221 struct drm_device *ddev = platform_get_drvdata(pdev); 222 223 DRM_DEBUG("%s\n", __func__); 224 225 drm_dev_unregister(ddev); 226 drv_unload(ddev); 227 drm_dev_put(ddev); 228 229 return 0; 230 } 231 232 static const struct of_device_id drv_dt_ids[] = { 233 { .compatible = "st,stm32-ltdc"}, 234 { /* end node */ }, 235 }; 236 MODULE_DEVICE_TABLE(of, drv_dt_ids); 237 238 static struct platform_driver stm_drm_platform_driver = { 239 .probe = stm_drm_platform_probe, 240 .remove = stm_drm_platform_remove, 241 .driver = { 242 .name = "stm32-display", 243 .of_match_table = drv_dt_ids, 244 .pm = &drv_pm_ops, 245 }, 246 }; 247 248 module_platform_driver(stm_drm_platform_driver); 249 250 MODULE_AUTHOR("Philippe Cornu <philippe.cornu@st.com>"); 251 MODULE_AUTHOR("Yannick Fertre <yannick.fertre@st.com>"); 252 MODULE_AUTHOR("Fabien Dessenne <fabien.dessenne@st.com>"); 253 MODULE_AUTHOR("Mickael Reulier <mickael.reulier@st.com>"); 254 MODULE_DESCRIPTION("STMicroelectronics ST DRM LTDC driver"); 255 MODULE_LICENSE("GPL v2"); 256