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/aperture.h> 12 #include <linux/component.h> 13 #include <linux/dma-mapping.h> 14 #include <linux/mod_devicetable.h> 15 #include <linux/module.h> 16 #include <linux/platform_device.h> 17 #include <linux/pm_runtime.h> 18 19 #include <drm/drm_atomic.h> 20 #include <drm/drm_atomic_helper.h> 21 #include <drm/drm_client_setup.h> 22 #include <drm/drm_drv.h> 23 #include <drm/drm_fbdev_dma.h> 24 #include <drm/drm_fourcc.h> 25 #include <drm/drm_gem_dma_helper.h> 26 #include <drm/drm_gem_framebuffer_helper.h> 27 #include <drm/drm_module.h> 28 #include <drm/drm_probe_helper.h> 29 #include <drm/drm_vblank.h> 30 #include <drm/drm_managed.h> 31 32 #include "ltdc.h" 33 34 #define STM_MAX_FB_WIDTH 2048 35 #define STM_MAX_FB_HEIGHT 2048 /* same as width to handle orientation */ 36 37 static const struct drm_mode_config_funcs drv_mode_config_funcs = { 38 .fb_create = drm_gem_fb_create, 39 .atomic_check = drm_atomic_helper_check, 40 .atomic_commit = drm_atomic_helper_commit, 41 }; 42 43 static int stm_gem_dma_dumb_create(struct drm_file *file, 44 struct drm_device *dev, 45 struct drm_mode_create_dumb *args) 46 { 47 unsigned int min_pitch = DIV_ROUND_UP(args->width * args->bpp, 8); 48 49 /* 50 * in order to optimize data transfer, pitch is aligned on 51 * 128 bytes, height is aligned on 4 bytes 52 */ 53 args->pitch = roundup(min_pitch, 128); 54 args->height = roundup(args->height, 4); 55 56 return drm_gem_dma_dumb_create_internal(file, dev, args); 57 } 58 59 DEFINE_DRM_GEM_DMA_FOPS(drv_driver_fops); 60 61 static const struct drm_driver drv_driver = { 62 .driver_features = DRIVER_MODESET | DRIVER_GEM | DRIVER_ATOMIC, 63 .name = "stm", 64 .desc = "STMicroelectronics SoC DRM", 65 .date = "20170330", 66 .major = 1, 67 .minor = 0, 68 .patchlevel = 0, 69 .fops = &drv_driver_fops, 70 DRM_GEM_DMA_DRIVER_OPS_WITH_DUMB_CREATE(stm_gem_dma_dumb_create), 71 DRM_FBDEV_DMA_DRIVER_OPS, 72 }; 73 74 static int drv_load(struct drm_device *ddev) 75 { 76 struct platform_device *pdev = to_platform_device(ddev->dev); 77 struct ltdc_device *ldev; 78 int ret; 79 80 DRM_DEBUG("%s\n", __func__); 81 82 ldev = drmm_kzalloc(ddev, sizeof(*ldev), GFP_KERNEL); 83 if (!ldev) 84 return -ENOMEM; 85 86 ddev->dev_private = (void *)ldev; 87 88 ret = drmm_mode_config_init(ddev); 89 if (ret) 90 return ret; 91 92 /* 93 * set max width and height as default value. 94 * this value would be used to check framebuffer size limitation 95 * at drm_mode_addfb(). 96 */ 97 ddev->mode_config.min_width = 0; 98 ddev->mode_config.min_height = 0; 99 ddev->mode_config.max_width = STM_MAX_FB_WIDTH; 100 ddev->mode_config.max_height = STM_MAX_FB_HEIGHT; 101 ddev->mode_config.funcs = &drv_mode_config_funcs; 102 ddev->mode_config.normalize_zpos = true; 103 104 ret = ltdc_load(ddev); 105 if (ret) 106 return ret; 107 108 drm_mode_config_reset(ddev); 109 drm_kms_helper_poll_init(ddev); 110 111 platform_set_drvdata(pdev, ddev); 112 113 return 0; 114 } 115 116 static void drv_unload(struct drm_device *ddev) 117 { 118 DRM_DEBUG("%s\n", __func__); 119 120 drm_kms_helper_poll_fini(ddev); 121 drm_atomic_helper_shutdown(ddev); 122 ltdc_unload(ddev); 123 } 124 125 static __maybe_unused int drv_suspend(struct device *dev) 126 { 127 struct drm_device *ddev = dev_get_drvdata(dev); 128 struct ltdc_device *ldev = ddev->dev_private; 129 struct drm_atomic_state *state; 130 131 WARN_ON(ldev->suspend_state); 132 133 state = drm_atomic_helper_suspend(ddev); 134 if (IS_ERR(state)) 135 return PTR_ERR(state); 136 137 ldev->suspend_state = state; 138 pm_runtime_force_suspend(dev); 139 140 return 0; 141 } 142 143 static __maybe_unused int drv_resume(struct device *dev) 144 { 145 struct drm_device *ddev = dev_get_drvdata(dev); 146 struct ltdc_device *ldev = ddev->dev_private; 147 int ret; 148 149 if (WARN_ON(!ldev->suspend_state)) 150 return -ENOENT; 151 152 pm_runtime_force_resume(dev); 153 ret = drm_atomic_helper_resume(ddev, ldev->suspend_state); 154 if (ret) 155 pm_runtime_force_suspend(dev); 156 157 ldev->suspend_state = NULL; 158 159 return ret; 160 } 161 162 static __maybe_unused int drv_runtime_suspend(struct device *dev) 163 { 164 struct drm_device *ddev = dev_get_drvdata(dev); 165 166 DRM_DEBUG_DRIVER("\n"); 167 ltdc_suspend(ddev); 168 169 return 0; 170 } 171 172 static __maybe_unused int drv_runtime_resume(struct device *dev) 173 { 174 struct drm_device *ddev = dev_get_drvdata(dev); 175 176 DRM_DEBUG_DRIVER("\n"); 177 return ltdc_resume(ddev); 178 } 179 180 static const struct dev_pm_ops drv_pm_ops = { 181 SET_SYSTEM_SLEEP_PM_OPS(drv_suspend, drv_resume) 182 SET_RUNTIME_PM_OPS(drv_runtime_suspend, 183 drv_runtime_resume, NULL) 184 }; 185 186 static int stm_drm_platform_probe(struct platform_device *pdev) 187 { 188 struct device *dev = &pdev->dev; 189 struct drm_device *ddev; 190 int ret; 191 192 DRM_DEBUG("%s\n", __func__); 193 194 ret = aperture_remove_all_conflicting_devices(drv_driver.name); 195 if (ret) 196 return ret; 197 198 dma_set_coherent_mask(dev, DMA_BIT_MASK(32)); 199 200 ddev = drm_dev_alloc(&drv_driver, dev); 201 if (IS_ERR(ddev)) 202 return PTR_ERR(ddev); 203 204 ret = drv_load(ddev); 205 if (ret) 206 goto err_put; 207 208 ret = drm_dev_register(ddev, 0); 209 if (ret) 210 goto err_unload; 211 212 drm_client_setup_with_fourcc(ddev, DRM_FORMAT_RGB565); 213 214 return 0; 215 216 err_unload: 217 drv_unload(ddev); 218 err_put: 219 drm_dev_put(ddev); 220 221 return ret; 222 } 223 224 static void stm_drm_platform_remove(struct platform_device *pdev) 225 { 226 struct drm_device *ddev = platform_get_drvdata(pdev); 227 228 DRM_DEBUG("%s\n", __func__); 229 230 drm_dev_unregister(ddev); 231 drv_unload(ddev); 232 drm_dev_put(ddev); 233 } 234 235 static void stm_drm_platform_shutdown(struct platform_device *pdev) 236 { 237 drm_atomic_helper_shutdown(platform_get_drvdata(pdev)); 238 } 239 240 static const struct of_device_id drv_dt_ids[] = { 241 { .compatible = "st,stm32-ltdc"}, 242 { /* end node */ }, 243 }; 244 MODULE_DEVICE_TABLE(of, drv_dt_ids); 245 246 static struct platform_driver stm_drm_platform_driver = { 247 .probe = stm_drm_platform_probe, 248 .remove_new = stm_drm_platform_remove, 249 .shutdown = stm_drm_platform_shutdown, 250 .driver = { 251 .name = "stm32-display", 252 .of_match_table = drv_dt_ids, 253 .pm = &drv_pm_ops, 254 }, 255 }; 256 257 drm_module_platform_driver(stm_drm_platform_driver); 258 259 MODULE_AUTHOR("Philippe Cornu <philippe.cornu@st.com>"); 260 MODULE_AUTHOR("Yannick Fertre <yannick.fertre@st.com>"); 261 MODULE_AUTHOR("Fabien Dessenne <fabien.dessenne@st.com>"); 262 MODULE_AUTHOR("Mickael Reulier <mickael.reulier@st.com>"); 263 MODULE_DESCRIPTION("STMicroelectronics ST DRM LTDC driver"); 264 MODULE_LICENSE("GPL v2"); 265