1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * Copyright 2019 NXP. 4 */ 5 6 #include <drm/clients/drm_client_setup.h> 7 #include <drm/drm_atomic.h> 8 #include <drm/drm_atomic_helper.h> 9 #include <drm/drm_bridge.h> 10 #include <drm/drm_bridge_connector.h> 11 #include <drm/drm_drv.h> 12 #include <drm/drm_fbdev_dma.h> 13 #include <drm/drm_gem_dma_helper.h> 14 #include <drm/drm_gem_framebuffer_helper.h> 15 #include <drm/drm_of.h> 16 #include <drm/drm_probe_helper.h> 17 #include <drm/drm_vblank.h> 18 19 #include "dcss-dev.h" 20 #include "dcss-kms.h" 21 22 DEFINE_DRM_GEM_DMA_FOPS(dcss_cma_fops); 23 24 static const struct drm_mode_config_funcs dcss_drm_mode_config_funcs = { 25 .fb_create = drm_gem_fb_create, 26 .atomic_check = drm_atomic_helper_check, 27 .atomic_commit = drm_atomic_helper_commit, 28 }; 29 30 static const struct drm_driver dcss_kms_driver = { 31 .driver_features = DRIVER_MODESET | DRIVER_GEM | DRIVER_ATOMIC, 32 DRM_GEM_DMA_DRIVER_OPS, 33 DRM_FBDEV_DMA_DRIVER_OPS, 34 .fops = &dcss_cma_fops, 35 .name = "imx-dcss", 36 .desc = "i.MX8MQ Display Subsystem", 37 .major = 1, 38 .minor = 0, 39 .patchlevel = 0, 40 }; 41 42 static const struct drm_mode_config_helper_funcs dcss_mode_config_helpers = { 43 .atomic_commit_tail = drm_atomic_helper_commit_tail_rpm, 44 }; 45 46 static void dcss_kms_mode_config_init(struct dcss_kms_dev *kms) 47 { 48 struct drm_mode_config *config = &kms->base.mode_config; 49 50 drm_mode_config_init(&kms->base); 51 52 config->min_width = 1; 53 config->min_height = 1; 54 config->max_width = 4096; 55 config->max_height = 4096; 56 config->normalize_zpos = true; 57 58 config->funcs = &dcss_drm_mode_config_funcs; 59 config->helper_private = &dcss_mode_config_helpers; 60 } 61 62 static const struct drm_encoder_funcs dcss_kms_simple_encoder_funcs = { 63 .destroy = drm_encoder_cleanup, 64 }; 65 66 static int dcss_kms_bridge_connector_init(struct dcss_kms_dev *kms) 67 { 68 struct drm_device *ddev = &kms->base; 69 struct drm_encoder *encoder = &kms->encoder; 70 struct drm_crtc *crtc = (struct drm_crtc *)&kms->crtc; 71 struct drm_panel *panel; 72 struct drm_bridge *bridge; 73 int ret; 74 75 ret = drm_of_find_panel_or_bridge(ddev->dev->of_node, 0, 0, 76 &panel, &bridge); 77 if (ret) 78 return ret; 79 80 if (!bridge) { 81 dev_err(ddev->dev, "No bridge found %d.\n", ret); 82 return -ENODEV; 83 } 84 85 encoder->possible_crtcs = drm_crtc_mask(crtc); 86 87 ret = drm_encoder_init(&kms->base, encoder, 88 &dcss_kms_simple_encoder_funcs, 89 DRM_MODE_ENCODER_NONE, NULL); 90 if (ret) { 91 dev_err(ddev->dev, "Failed initializing encoder %d.\n", ret); 92 return ret; 93 } 94 95 ret = drm_bridge_attach(encoder, bridge, NULL, 96 DRM_BRIDGE_ATTACH_NO_CONNECTOR); 97 if (ret < 0) 98 return ret; 99 100 kms->connector = drm_bridge_connector_init(ddev, encoder); 101 if (IS_ERR(kms->connector)) { 102 dev_err(ddev->dev, "Unable to create bridge connector.\n"); 103 return PTR_ERR(kms->connector); 104 } 105 106 drm_connector_attach_encoder(kms->connector, encoder); 107 108 return 0; 109 } 110 111 struct dcss_kms_dev *dcss_kms_attach(struct dcss_dev *dcss) 112 { 113 struct dcss_kms_dev *kms; 114 struct drm_device *drm; 115 struct dcss_crtc *crtc; 116 int ret; 117 118 kms = devm_drm_dev_alloc(dcss->dev, &dcss_kms_driver, 119 struct dcss_kms_dev, base); 120 if (IS_ERR(kms)) 121 return kms; 122 123 drm = &kms->base; 124 crtc = &kms->crtc; 125 126 drm->dev_private = dcss; 127 128 dcss_kms_mode_config_init(kms); 129 130 ret = drm_vblank_init(drm, 1); 131 if (ret) 132 goto cleanup_mode_config; 133 134 ret = dcss_kms_bridge_connector_init(kms); 135 if (ret) 136 goto cleanup_mode_config; 137 138 ret = dcss_crtc_init(crtc, drm); 139 if (ret) 140 goto cleanup_mode_config; 141 142 drm_mode_config_reset(drm); 143 144 drm_kms_helper_poll_init(drm); 145 146 ret = drm_dev_register(drm, 0); 147 if (ret) 148 goto cleanup_crtc; 149 150 drm_client_setup(drm, NULL); 151 152 return kms; 153 154 cleanup_crtc: 155 drm_kms_helper_poll_fini(drm); 156 dcss_crtc_deinit(crtc, drm); 157 158 cleanup_mode_config: 159 drm_mode_config_cleanup(drm); 160 drm->dev_private = NULL; 161 162 return ERR_PTR(ret); 163 } 164 165 void dcss_kms_detach(struct dcss_kms_dev *kms) 166 { 167 struct drm_device *drm = &kms->base; 168 169 drm_dev_unregister(drm); 170 drm_kms_helper_poll_fini(drm); 171 drm_atomic_helper_shutdown(drm); 172 drm_crtc_vblank_off(&kms->crtc.base); 173 drm_mode_config_cleanup(drm); 174 dcss_crtc_deinit(&kms->crtc, drm); 175 drm->dev_private = NULL; 176 } 177 178 void dcss_kms_shutdown(struct dcss_kms_dev *kms) 179 { 180 struct drm_device *drm = &kms->base; 181 182 drm_atomic_helper_shutdown(drm); 183 } 184