// SPDX-License-Identifier: GPL-2.0 /* * Copyright (C) STMicroelectronics SA 2017 * * Authors: Philippe Cornu <philippe.cornu@st.com> * Yannick Fertre <yannick.fertre@st.com> * Fabien Dessenne <fabien.dessenne@st.com> * Mickael Reulier <mickael.reulier@st.com> */ #include <linux/component.h> #include <linux/dma-mapping.h> #include <linux/mod_devicetable.h> #include <linux/module.h> #include <linux/platform_device.h> #include <linux/pm_runtime.h> #include <drm/drm_aperture.h> #include <drm/drm_atomic.h> #include <drm/drm_atomic_helper.h> #include <drm/drm_drv.h> #include <drm/drm_fbdev_dma.h> #include <drm/drm_gem_dma_helper.h> #include <drm/drm_gem_framebuffer_helper.h> #include <drm/drm_module.h> #include <drm/drm_probe_helper.h> #include <drm/drm_vblank.h> #include "ltdc.h" #define STM_MAX_FB_WIDTH 2048 #define STM_MAX_FB_HEIGHT 2048 /* same as width to handle orientation */ static const struct drm_mode_config_funcs drv_mode_config_funcs = { .fb_create = drm_gem_fb_create, .atomic_check = drm_atomic_helper_check, .atomic_commit = drm_atomic_helper_commit, }; static int stm_gem_dma_dumb_create(struct drm_file *file, struct drm_device *dev, struct drm_mode_create_dumb *args) { unsigned int min_pitch = DIV_ROUND_UP(args->width * args->bpp, 8); /* * in order to optimize data transfer, pitch is aligned on * 128 bytes, height is aligned on 4 bytes */ args->pitch = roundup(min_pitch, 128); args->height = roundup(args->height, 4); return drm_gem_dma_dumb_create_internal(file, dev, args); } DEFINE_DRM_GEM_DMA_FOPS(drv_driver_fops); static const struct drm_driver drv_driver = { .driver_features = DRIVER_MODESET | DRIVER_GEM | DRIVER_ATOMIC, .name = "stm", .desc = "STMicroelectronics SoC DRM", .date = "20170330", .major = 1, .minor = 0, .patchlevel = 0, .fops = &drv_driver_fops, DRM_GEM_DMA_DRIVER_OPS_WITH_DUMB_CREATE(stm_gem_dma_dumb_create), }; static int drv_load(struct drm_device *ddev) { struct platform_device *pdev = to_platform_device(ddev->dev); struct ltdc_device *ldev; int ret; DRM_DEBUG("%s\n", __func__); ldev = devm_kzalloc(ddev->dev, sizeof(*ldev), GFP_KERNEL); if (!ldev) return -ENOMEM; ddev->dev_private = (void *)ldev; ret = drmm_mode_config_init(ddev); if (ret) return ret; /* * set max width and height as default value. * this value would be used to check framebuffer size limitation * at drm_mode_addfb(). */ ddev->mode_config.min_width = 0; ddev->mode_config.min_height = 0; ddev->mode_config.max_width = STM_MAX_FB_WIDTH; ddev->mode_config.max_height = STM_MAX_FB_HEIGHT; ddev->mode_config.funcs = &drv_mode_config_funcs; ddev->mode_config.normalize_zpos = true; ret = ltdc_load(ddev); if (ret) return ret; drm_mode_config_reset(ddev); drm_kms_helper_poll_init(ddev); platform_set_drvdata(pdev, ddev); return 0; } static void drv_unload(struct drm_device *ddev) { DRM_DEBUG("%s\n", __func__); drm_kms_helper_poll_fini(ddev); ltdc_unload(ddev); } static __maybe_unused int drv_suspend(struct device *dev) { struct drm_device *ddev = dev_get_drvdata(dev); struct ltdc_device *ldev = ddev->dev_private; struct drm_atomic_state *state; WARN_ON(ldev->suspend_state); state = drm_atomic_helper_suspend(ddev); if (IS_ERR(state)) return PTR_ERR(state); ldev->suspend_state = state; pm_runtime_force_suspend(dev); return 0; } static __maybe_unused int drv_resume(struct device *dev) { struct drm_device *ddev = dev_get_drvdata(dev); struct ltdc_device *ldev = ddev->dev_private; int ret; if (WARN_ON(!ldev->suspend_state)) return -ENOENT; pm_runtime_force_resume(dev); ret = drm_atomic_helper_resume(ddev, ldev->suspend_state); if (ret) pm_runtime_force_suspend(dev); ldev->suspend_state = NULL; return ret; } static __maybe_unused int drv_runtime_suspend(struct device *dev) { struct drm_device *ddev = dev_get_drvdata(dev); DRM_DEBUG_DRIVER("\n"); ltdc_suspend(ddev); return 0; } static __maybe_unused int drv_runtime_resume(struct device *dev) { struct drm_device *ddev = dev_get_drvdata(dev); DRM_DEBUG_DRIVER("\n"); return ltdc_resume(ddev); } static const struct dev_pm_ops drv_pm_ops = { SET_SYSTEM_SLEEP_PM_OPS(drv_suspend, drv_resume) SET_RUNTIME_PM_OPS(drv_runtime_suspend, drv_runtime_resume, NULL) }; static int stm_drm_platform_probe(struct platform_device *pdev) { struct device *dev = &pdev->dev; struct drm_device *ddev; int ret; DRM_DEBUG("%s\n", __func__); ret = drm_aperture_remove_framebuffers(&drv_driver); if (ret) return ret; dma_set_coherent_mask(dev, DMA_BIT_MASK(32)); ddev = drm_dev_alloc(&drv_driver, dev); if (IS_ERR(ddev)) return PTR_ERR(ddev); ret = drv_load(ddev); if (ret) goto err_put; ret = drm_dev_register(ddev, 0); if (ret) goto err_put; drm_fbdev_dma_setup(ddev, 16); return 0; err_put: drm_dev_put(ddev); return ret; } static void stm_drm_platform_remove(struct platform_device *pdev) { struct drm_device *ddev = platform_get_drvdata(pdev); DRM_DEBUG("%s\n", __func__); drm_dev_unregister(ddev); drv_unload(ddev); drm_dev_put(ddev); } static const struct of_device_id drv_dt_ids[] = { { .compatible = "st,stm32-ltdc"}, { /* end node */ }, }; MODULE_DEVICE_TABLE(of, drv_dt_ids); static struct platform_driver stm_drm_platform_driver = { .probe = stm_drm_platform_probe, .remove_new = stm_drm_platform_remove, .driver = { .name = "stm32-display", .of_match_table = drv_dt_ids, .pm = &drv_pm_ops, }, }; drm_module_platform_driver(stm_drm_platform_driver); MODULE_AUTHOR("Philippe Cornu <philippe.cornu@st.com>"); MODULE_AUTHOR("Yannick Fertre <yannick.fertre@st.com>"); MODULE_AUTHOR("Fabien Dessenne <fabien.dessenne@st.com>"); MODULE_AUTHOR("Mickael Reulier <mickael.reulier@st.com>"); MODULE_DESCRIPTION("STMicroelectronics ST DRM LTDC driver"); MODULE_LICENSE("GPL v2");