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"); 260