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 const 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 DRM_GEM_CMA_DRIVER_OPS_WITH_DUMB_CREATE(stm_gem_cma_dumb_create), 66 }; 67 68 static int drv_load(struct drm_device *ddev) 69 { 70 struct platform_device *pdev = to_platform_device(ddev->dev); 71 struct ltdc_device *ldev; 72 int ret; 73 74 DRM_DEBUG("%s\n", __func__); 75 76 ldev = devm_kzalloc(ddev->dev, sizeof(*ldev), GFP_KERNEL); 77 if (!ldev) 78 return -ENOMEM; 79 80 ddev->dev_private = (void *)ldev; 81 82 ret = drmm_mode_config_init(ddev); 83 if (ret) 84 return ret; 85 86 /* 87 * set max width and height as default value. 88 * this value would be used to check framebuffer size limitation 89 * at drm_mode_addfb(). 90 */ 91 ddev->mode_config.min_width = 0; 92 ddev->mode_config.min_height = 0; 93 ddev->mode_config.max_width = STM_MAX_FB_WIDTH; 94 ddev->mode_config.max_height = STM_MAX_FB_HEIGHT; 95 ddev->mode_config.funcs = &drv_mode_config_funcs; 96 97 ret = ltdc_load(ddev); 98 if (ret) 99 return ret; 100 101 drm_mode_config_reset(ddev); 102 drm_kms_helper_poll_init(ddev); 103 104 platform_set_drvdata(pdev, ddev); 105 106 return 0; 107 } 108 109 static void drv_unload(struct drm_device *ddev) 110 { 111 DRM_DEBUG("%s\n", __func__); 112 113 drm_kms_helper_poll_fini(ddev); 114 ltdc_unload(ddev); 115 } 116 117 static __maybe_unused int drv_suspend(struct device *dev) 118 { 119 struct drm_device *ddev = dev_get_drvdata(dev); 120 struct ltdc_device *ldev = ddev->dev_private; 121 struct drm_atomic_state *state; 122 123 WARN_ON(ldev->suspend_state); 124 125 state = drm_atomic_helper_suspend(ddev); 126 if (IS_ERR(state)) 127 return PTR_ERR(state); 128 129 ldev->suspend_state = state; 130 pm_runtime_force_suspend(dev); 131 132 return 0; 133 } 134 135 static __maybe_unused int drv_resume(struct device *dev) 136 { 137 struct drm_device *ddev = dev_get_drvdata(dev); 138 struct ltdc_device *ldev = ddev->dev_private; 139 int ret; 140 141 if (WARN_ON(!ldev->suspend_state)) 142 return -ENOENT; 143 144 pm_runtime_force_resume(dev); 145 ret = drm_atomic_helper_resume(ddev, ldev->suspend_state); 146 if (ret) 147 pm_runtime_force_suspend(dev); 148 149 ldev->suspend_state = NULL; 150 151 return ret; 152 } 153 154 static __maybe_unused int drv_runtime_suspend(struct device *dev) 155 { 156 struct drm_device *ddev = dev_get_drvdata(dev); 157 158 DRM_DEBUG_DRIVER("\n"); 159 ltdc_suspend(ddev); 160 161 return 0; 162 } 163 164 static __maybe_unused int drv_runtime_resume(struct device *dev) 165 { 166 struct drm_device *ddev = dev_get_drvdata(dev); 167 168 DRM_DEBUG_DRIVER("\n"); 169 return ltdc_resume(ddev); 170 } 171 172 static const struct dev_pm_ops drv_pm_ops = { 173 SET_SYSTEM_SLEEP_PM_OPS(drv_suspend, drv_resume) 174 SET_RUNTIME_PM_OPS(drv_runtime_suspend, 175 drv_runtime_resume, NULL) 176 }; 177 178 static int stm_drm_platform_probe(struct platform_device *pdev) 179 { 180 struct device *dev = &pdev->dev; 181 struct drm_device *ddev; 182 int ret; 183 184 DRM_DEBUG("%s\n", __func__); 185 186 dma_set_coherent_mask(dev, DMA_BIT_MASK(32)); 187 188 ddev = drm_dev_alloc(&drv_driver, dev); 189 if (IS_ERR(ddev)) 190 return PTR_ERR(ddev); 191 192 ret = drv_load(ddev); 193 if (ret) 194 goto err_put; 195 196 ret = drm_dev_register(ddev, 0); 197 if (ret) 198 goto err_put; 199 200 drm_fbdev_generic_setup(ddev, 16); 201 202 return 0; 203 204 err_put: 205 drm_dev_put(ddev); 206 207 return ret; 208 } 209 210 static int stm_drm_platform_remove(struct platform_device *pdev) 211 { 212 struct drm_device *ddev = platform_get_drvdata(pdev); 213 214 DRM_DEBUG("%s\n", __func__); 215 216 drm_dev_unregister(ddev); 217 drv_unload(ddev); 218 drm_dev_put(ddev); 219 220 return 0; 221 } 222 223 static const struct of_device_id drv_dt_ids[] = { 224 { .compatible = "st,stm32-ltdc"}, 225 { /* end node */ }, 226 }; 227 MODULE_DEVICE_TABLE(of, drv_dt_ids); 228 229 static struct platform_driver stm_drm_platform_driver = { 230 .probe = stm_drm_platform_probe, 231 .remove = stm_drm_platform_remove, 232 .driver = { 233 .name = "stm32-display", 234 .of_match_table = drv_dt_ids, 235 .pm = &drv_pm_ops, 236 }, 237 }; 238 239 module_platform_driver(stm_drm_platform_driver); 240 241 MODULE_AUTHOR("Philippe Cornu <philippe.cornu@st.com>"); 242 MODULE_AUTHOR("Yannick Fertre <yannick.fertre@st.com>"); 243 MODULE_AUTHOR("Fabien Dessenne <fabien.dessenne@st.com>"); 244 MODULE_AUTHOR("Mickael Reulier <mickael.reulier@st.com>"); 245 MODULE_DESCRIPTION("STMicroelectronics ST DRM LTDC driver"); 246 MODULE_LICENSE("GPL v2"); 247