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/mod_devicetable.h> 14 #include <linux/module.h> 15 #include <linux/platform_device.h> 16 #include <linux/pm_runtime.h> 17 18 #include <drm/drm_aperture.h> 19 #include <drm/drm_atomic.h> 20 #include <drm/drm_atomic_helper.h> 21 #include <drm/drm_drv.h> 22 #include <drm/drm_fbdev_dma.h> 23 #include <drm/drm_gem_dma_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_dma_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_dma_dumb_create_internal(file, dev, args); 54 } 55 56 DEFINE_DRM_GEM_DMA_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_DMA_DRIVER_OPS_WITH_DUMB_CREATE(stm_gem_dma_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 drm_atomic_helper_shutdown(ddev); 118 ltdc_unload(ddev); 119 } 120 121 static __maybe_unused int drv_suspend(struct device *dev) 122 { 123 struct drm_device *ddev = dev_get_drvdata(dev); 124 struct ltdc_device *ldev = ddev->dev_private; 125 struct drm_atomic_state *state; 126 127 WARN_ON(ldev->suspend_state); 128 129 state = drm_atomic_helper_suspend(ddev); 130 if (IS_ERR(state)) 131 return PTR_ERR(state); 132 133 ldev->suspend_state = state; 134 pm_runtime_force_suspend(dev); 135 136 return 0; 137 } 138 139 static __maybe_unused int drv_resume(struct device *dev) 140 { 141 struct drm_device *ddev = dev_get_drvdata(dev); 142 struct ltdc_device *ldev = ddev->dev_private; 143 int ret; 144 145 if (WARN_ON(!ldev->suspend_state)) 146 return -ENOENT; 147 148 pm_runtime_force_resume(dev); 149 ret = drm_atomic_helper_resume(ddev, ldev->suspend_state); 150 if (ret) 151 pm_runtime_force_suspend(dev); 152 153 ldev->suspend_state = NULL; 154 155 return ret; 156 } 157 158 static __maybe_unused int drv_runtime_suspend(struct device *dev) 159 { 160 struct drm_device *ddev = dev_get_drvdata(dev); 161 162 DRM_DEBUG_DRIVER("\n"); 163 ltdc_suspend(ddev); 164 165 return 0; 166 } 167 168 static __maybe_unused int drv_runtime_resume(struct device *dev) 169 { 170 struct drm_device *ddev = dev_get_drvdata(dev); 171 172 DRM_DEBUG_DRIVER("\n"); 173 return ltdc_resume(ddev); 174 } 175 176 static const struct dev_pm_ops drv_pm_ops = { 177 SET_SYSTEM_SLEEP_PM_OPS(drv_suspend, drv_resume) 178 SET_RUNTIME_PM_OPS(drv_runtime_suspend, 179 drv_runtime_resume, NULL) 180 }; 181 182 static int stm_drm_platform_probe(struct platform_device *pdev) 183 { 184 struct device *dev = &pdev->dev; 185 struct drm_device *ddev; 186 int ret; 187 188 DRM_DEBUG("%s\n", __func__); 189 190 ret = drm_aperture_remove_framebuffers(&drv_driver); 191 if (ret) 192 return ret; 193 194 dma_set_coherent_mask(dev, DMA_BIT_MASK(32)); 195 196 ddev = drm_dev_alloc(&drv_driver, dev); 197 if (IS_ERR(ddev)) 198 return PTR_ERR(ddev); 199 200 ret = drv_load(ddev); 201 if (ret) 202 goto err_put; 203 204 ret = drm_dev_register(ddev, 0); 205 if (ret) 206 goto err_unload; 207 208 drm_fbdev_dma_setup(ddev, 16); 209 210 return 0; 211 212 err_unload: 213 drv_unload(ddev); 214 err_put: 215 drm_dev_put(ddev); 216 217 return ret; 218 } 219 220 static void stm_drm_platform_remove(struct platform_device *pdev) 221 { 222 struct drm_device *ddev = platform_get_drvdata(pdev); 223 224 DRM_DEBUG("%s\n", __func__); 225 226 drm_dev_unregister(ddev); 227 drv_unload(ddev); 228 drm_dev_put(ddev); 229 } 230 231 static void stm_drm_platform_shutdown(struct platform_device *pdev) 232 { 233 drm_atomic_helper_shutdown(platform_get_drvdata(pdev)); 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_new = stm_drm_platform_remove, 245 .shutdown = stm_drm_platform_shutdown, 246 .driver = { 247 .name = "stm32-display", 248 .of_match_table = drv_dt_ids, 249 .pm = &drv_pm_ops, 250 }, 251 }; 252 253 drm_module_platform_driver(stm_drm_platform_driver); 254 255 MODULE_AUTHOR("Philippe Cornu <philippe.cornu@st.com>"); 256 MODULE_AUTHOR("Yannick Fertre <yannick.fertre@st.com>"); 257 MODULE_AUTHOR("Fabien Dessenne <fabien.dessenne@st.com>"); 258 MODULE_AUTHOR("Mickael Reulier <mickael.reulier@st.com>"); 259 MODULE_DESCRIPTION("STMicroelectronics ST DRM LTDC driver"); 260 MODULE_LICENSE("GPL v2"); 261