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_cma_helper.h> 22 #include <drm/drm_fb_helper.h> 23 #include <drm/drm_gem_cma_helper.h> 24 #include <drm/drm_gem_framebuffer_helper.h> 25 #include <drm/drm_module.h> 26 #include <drm/drm_probe_helper.h> 27 #include <drm/drm_vblank.h> 28 29 #include "ltdc.h" 30 31 #define STM_MAX_FB_WIDTH 2048 32 #define STM_MAX_FB_HEIGHT 2048 /* same as width to handle orientation */ 33 34 static const struct drm_mode_config_funcs drv_mode_config_funcs = { 35 .fb_create = drm_gem_fb_create, 36 .atomic_check = drm_atomic_helper_check, 37 .atomic_commit = drm_atomic_helper_commit, 38 }; 39 40 static int stm_gem_cma_dumb_create(struct drm_file *file, 41 struct drm_device *dev, 42 struct drm_mode_create_dumb *args) 43 { 44 unsigned int min_pitch = DIV_ROUND_UP(args->width * args->bpp, 8); 45 46 /* 47 * in order to optimize data transfer, pitch is aligned on 48 * 128 bytes, height is aligned on 4 bytes 49 */ 50 args->pitch = roundup(min_pitch, 128); 51 args->height = roundup(args->height, 4); 52 53 return drm_gem_cma_dumb_create_internal(file, dev, args); 54 } 55 56 DEFINE_DRM_GEM_CMA_FOPS(drv_driver_fops); 57 58 static const struct drm_driver drv_driver = { 59 .driver_features = DRIVER_MODESET | DRIVER_GEM | DRIVER_ATOMIC, 60 .name = "stm", 61 .desc = "STMicroelectronics SoC DRM", 62 .date = "20170330", 63 .major = 1, 64 .minor = 0, 65 .patchlevel = 0, 66 .fops = &drv_driver_fops, 67 DRM_GEM_CMA_DRIVER_OPS_WITH_DUMB_CREATE(stm_gem_cma_dumb_create), 68 }; 69 70 static int drv_load(struct drm_device *ddev) 71 { 72 struct platform_device *pdev = to_platform_device(ddev->dev); 73 struct ltdc_device *ldev; 74 int ret; 75 76 DRM_DEBUG("%s\n", __func__); 77 78 ldev = devm_kzalloc(ddev->dev, sizeof(*ldev), GFP_KERNEL); 79 if (!ldev) 80 return -ENOMEM; 81 82 ddev->dev_private = (void *)ldev; 83 84 ret = drmm_mode_config_init(ddev); 85 if (ret) 86 return ret; 87 88 /* 89 * set max width and height as default value. 90 * this value would be used to check framebuffer size limitation 91 * at drm_mode_addfb(). 92 */ 93 ddev->mode_config.min_width = 0; 94 ddev->mode_config.min_height = 0; 95 ddev->mode_config.max_width = STM_MAX_FB_WIDTH; 96 ddev->mode_config.max_height = STM_MAX_FB_HEIGHT; 97 ddev->mode_config.funcs = &drv_mode_config_funcs; 98 ddev->mode_config.normalize_zpos = true; 99 100 ret = ltdc_load(ddev); 101 if (ret) 102 return ret; 103 104 drm_mode_config_reset(ddev); 105 drm_kms_helper_poll_init(ddev); 106 107 platform_set_drvdata(pdev, ddev); 108 109 return 0; 110 } 111 112 static void drv_unload(struct drm_device *ddev) 113 { 114 DRM_DEBUG("%s\n", __func__); 115 116 drm_kms_helper_poll_fini(ddev); 117 ltdc_unload(ddev); 118 } 119 120 static __maybe_unused int drv_suspend(struct device *dev) 121 { 122 struct drm_device *ddev = dev_get_drvdata(dev); 123 struct ltdc_device *ldev = ddev->dev_private; 124 struct drm_atomic_state *state; 125 126 WARN_ON(ldev->suspend_state); 127 128 state = drm_atomic_helper_suspend(ddev); 129 if (IS_ERR(state)) 130 return PTR_ERR(state); 131 132 ldev->suspend_state = state; 133 pm_runtime_force_suspend(dev); 134 135 return 0; 136 } 137 138 static __maybe_unused int drv_resume(struct device *dev) 139 { 140 struct drm_device *ddev = dev_get_drvdata(dev); 141 struct ltdc_device *ldev = ddev->dev_private; 142 int ret; 143 144 if (WARN_ON(!ldev->suspend_state)) 145 return -ENOENT; 146 147 pm_runtime_force_resume(dev); 148 ret = drm_atomic_helper_resume(ddev, ldev->suspend_state); 149 if (ret) 150 pm_runtime_force_suspend(dev); 151 152 ldev->suspend_state = NULL; 153 154 return ret; 155 } 156 157 static __maybe_unused int drv_runtime_suspend(struct device *dev) 158 { 159 struct drm_device *ddev = dev_get_drvdata(dev); 160 161 DRM_DEBUG_DRIVER("\n"); 162 ltdc_suspend(ddev); 163 164 return 0; 165 } 166 167 static __maybe_unused int drv_runtime_resume(struct device *dev) 168 { 169 struct drm_device *ddev = dev_get_drvdata(dev); 170 171 DRM_DEBUG_DRIVER("\n"); 172 return ltdc_resume(ddev); 173 } 174 175 static const struct dev_pm_ops drv_pm_ops = { 176 SET_SYSTEM_SLEEP_PM_OPS(drv_suspend, drv_resume) 177 SET_RUNTIME_PM_OPS(drv_runtime_suspend, 178 drv_runtime_resume, NULL) 179 }; 180 181 static int stm_drm_platform_probe(struct platform_device *pdev) 182 { 183 struct device *dev = &pdev->dev; 184 struct drm_device *ddev; 185 int ret; 186 187 DRM_DEBUG("%s\n", __func__); 188 189 ret = drm_aperture_remove_framebuffers(false, &drv_driver); 190 if (ret) 191 return ret; 192 193 dma_set_coherent_mask(dev, DMA_BIT_MASK(32)); 194 195 ddev = drm_dev_alloc(&drv_driver, dev); 196 if (IS_ERR(ddev)) 197 return PTR_ERR(ddev); 198 199 ret = drv_load(ddev); 200 if (ret) 201 goto err_put; 202 203 ret = drm_dev_register(ddev, 0); 204 if (ret) 205 goto err_put; 206 207 drm_fbdev_generic_setup(ddev, 16); 208 209 return 0; 210 211 err_put: 212 drm_dev_put(ddev); 213 214 return ret; 215 } 216 217 static int stm_drm_platform_remove(struct platform_device *pdev) 218 { 219 struct drm_device *ddev = platform_get_drvdata(pdev); 220 221 DRM_DEBUG("%s\n", __func__); 222 223 drm_dev_unregister(ddev); 224 drv_unload(ddev); 225 drm_dev_put(ddev); 226 227 return 0; 228 } 229 230 static const struct of_device_id drv_dt_ids[] = { 231 { .compatible = "st,stm32-ltdc"}, 232 { /* end node */ }, 233 }; 234 MODULE_DEVICE_TABLE(of, drv_dt_ids); 235 236 static struct platform_driver stm_drm_platform_driver = { 237 .probe = stm_drm_platform_probe, 238 .remove = stm_drm_platform_remove, 239 .driver = { 240 .name = "stm32-display", 241 .of_match_table = drv_dt_ids, 242 .pm = &drv_pm_ops, 243 }, 244 }; 245 246 drm_module_platform_driver(stm_drm_platform_driver); 247 248 MODULE_AUTHOR("Philippe Cornu <philippe.cornu@st.com>"); 249 MODULE_AUTHOR("Yannick Fertre <yannick.fertre@st.com>"); 250 MODULE_AUTHOR("Fabien Dessenne <fabien.dessenne@st.com>"); 251 MODULE_AUTHOR("Mickael Reulier <mickael.reulier@st.com>"); 252 MODULE_DESCRIPTION("STMicroelectronics ST DRM LTDC driver"); 253 MODULE_LICENSE("GPL v2"); 254