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_panel.h> 17 #include <drm/drm_probe_helper.h> 18 #include <drm/drm_vblank.h> 19 20 #include "dcss-dev.h" 21 #include "dcss-kms.h" 22 23 DEFINE_DRM_GEM_DMA_FOPS(dcss_cma_fops); 24 25 static const struct drm_mode_config_funcs dcss_drm_mode_config_funcs = { 26 .fb_create = drm_gem_fb_create, 27 .atomic_check = drm_atomic_helper_check, 28 .atomic_commit = drm_atomic_helper_commit, 29 }; 30 31 static const struct drm_driver dcss_kms_driver = { 32 .driver_features = DRIVER_MODESET | DRIVER_GEM | DRIVER_ATOMIC, 33 DRM_GEM_DMA_DRIVER_OPS, 34 DRM_FBDEV_DMA_DRIVER_OPS, 35 .fops = &dcss_cma_fops, 36 .name = "imx-dcss", 37 .desc = "i.MX8MQ Display Subsystem", 38 .major = 1, 39 .minor = 0, 40 .patchlevel = 0, 41 }; 42 43 static const struct drm_mode_config_helper_funcs dcss_mode_config_helpers = { 44 .atomic_commit_tail = drm_atomic_helper_commit_tail_rpm, 45 }; 46 47 static void dcss_kms_mode_config_init(struct dcss_kms_dev *kms) 48 { 49 struct drm_mode_config *config = &kms->base.mode_config; 50 51 drm_mode_config_init(&kms->base); 52 53 config->min_width = 1; 54 config->min_height = 1; 55 config->max_width = 4096; 56 config->max_height = 4096; 57 config->normalize_zpos = true; 58 59 config->funcs = &dcss_drm_mode_config_funcs; 60 config->helper_private = &dcss_mode_config_helpers; 61 } 62 63 static const struct drm_encoder_funcs dcss_kms_simple_encoder_funcs = { 64 .destroy = drm_encoder_cleanup, 65 }; 66 67 static int dcss_kms_bridge_connector_init(struct dcss_kms_dev *kms) 68 { 69 struct drm_device *ddev = &kms->base; 70 struct drm_encoder *encoder = &kms->encoder; 71 struct drm_crtc *crtc = (struct drm_crtc *)&kms->crtc; 72 struct drm_panel *panel; 73 struct drm_bridge *bridge; 74 int ret; 75 76 ret = drm_of_find_panel_or_bridge(ddev->dev->of_node, 0, 0, 77 &panel, &bridge); 78 if (ret) 79 return ret; 80 81 if (panel) 82 drm_panel_put(panel); 83 84 if (!bridge) { 85 dev_err(ddev->dev, "No bridge found %d.\n", ret); 86 return -ENODEV; 87 } 88 89 encoder->possible_crtcs = drm_crtc_mask(crtc); 90 91 ret = drm_encoder_init(&kms->base, encoder, 92 &dcss_kms_simple_encoder_funcs, 93 DRM_MODE_ENCODER_NONE, NULL); 94 if (ret) { 95 dev_err(ddev->dev, "Failed initializing encoder %d.\n", ret); 96 return ret; 97 } 98 99 ret = drm_bridge_attach(encoder, bridge, NULL, 100 DRM_BRIDGE_ATTACH_NO_CONNECTOR); 101 if (ret < 0) 102 return ret; 103 104 kms->connector = drm_bridge_connector_init(ddev, encoder); 105 if (IS_ERR(kms->connector)) { 106 dev_err(ddev->dev, "Unable to create bridge connector.\n"); 107 return PTR_ERR(kms->connector); 108 } 109 110 return 0; 111 } 112 113 struct dcss_kms_dev *dcss_kms_attach(struct dcss_dev *dcss) 114 { 115 struct dcss_kms_dev *kms; 116 struct drm_device *drm; 117 struct dcss_crtc *crtc; 118 int ret; 119 120 kms = devm_drm_dev_alloc(dcss->dev, &dcss_kms_driver, 121 struct dcss_kms_dev, base); 122 if (IS_ERR(kms)) 123 return kms; 124 125 drm = &kms->base; 126 crtc = &kms->crtc; 127 128 drm->dev_private = dcss; 129 130 dcss_kms_mode_config_init(kms); 131 132 ret = drm_vblank_init(drm, 1); 133 if (ret) 134 goto cleanup_mode_config; 135 136 ret = dcss_kms_bridge_connector_init(kms); 137 if (ret) 138 goto cleanup_mode_config; 139 140 ret = dcss_crtc_init(crtc, drm); 141 if (ret) 142 goto cleanup_mode_config; 143 144 drm_mode_config_reset(drm); 145 146 drm_kms_helper_poll_init(drm); 147 148 ret = drm_dev_register(drm, 0); 149 if (ret) 150 goto cleanup_crtc; 151 152 drm_client_setup(drm, NULL); 153 154 return kms; 155 156 cleanup_crtc: 157 drm_kms_helper_poll_fini(drm); 158 dcss_crtc_deinit(crtc, drm); 159 160 cleanup_mode_config: 161 drm_mode_config_cleanup(drm); 162 drm->dev_private = NULL; 163 164 return ERR_PTR(ret); 165 } 166 167 void dcss_kms_detach(struct dcss_kms_dev *kms) 168 { 169 struct drm_device *drm = &kms->base; 170 171 drm_dev_unregister(drm); 172 drm_kms_helper_poll_fini(drm); 173 drm_atomic_helper_shutdown(drm); 174 drm_crtc_vblank_off(&kms->crtc.base); 175 drm_mode_config_cleanup(drm); 176 dcss_crtc_deinit(&kms->crtc, drm); 177 drm->dev_private = NULL; 178 } 179 180 void dcss_kms_shutdown(struct dcss_kms_dev *kms) 181 { 182 struct drm_device *drm = &kms->base; 183 184 drm_atomic_helper_shutdown(drm); 185 } 186