1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * Copyright 2019 NXP. 4 */ 5 6 #include <drm/drm_atomic.h> 7 #include <drm/drm_atomic_helper.h> 8 #include <drm/drm_bridge_connector.h> 9 #include <drm/drm_drv.h> 10 #include <drm/drm_fbdev_generic.h> 11 #include <drm/drm_gem_dma_helper.h> 12 #include <drm/drm_gem_framebuffer_helper.h> 13 #include <drm/drm_of.h> 14 #include <drm/drm_probe_helper.h> 15 #include <drm/drm_vblank.h> 16 17 #include "dcss-dev.h" 18 #include "dcss-kms.h" 19 20 DEFINE_DRM_GEM_DMA_FOPS(dcss_cma_fops); 21 22 static const struct drm_mode_config_funcs dcss_drm_mode_config_funcs = { 23 .fb_create = drm_gem_fb_create, 24 .atomic_check = drm_atomic_helper_check, 25 .atomic_commit = drm_atomic_helper_commit, 26 }; 27 28 static const struct drm_driver dcss_kms_driver = { 29 .driver_features = DRIVER_MODESET | DRIVER_GEM | DRIVER_ATOMIC, 30 DRM_GEM_DMA_DRIVER_OPS, 31 .fops = &dcss_cma_fops, 32 .name = "imx-dcss", 33 .desc = "i.MX8MQ Display Subsystem", 34 .date = "20190917", 35 .major = 1, 36 .minor = 0, 37 .patchlevel = 0, 38 }; 39 40 static const struct drm_mode_config_helper_funcs dcss_mode_config_helpers = { 41 .atomic_commit_tail = drm_atomic_helper_commit_tail_rpm, 42 }; 43 44 static void dcss_kms_mode_config_init(struct dcss_kms_dev *kms) 45 { 46 struct drm_mode_config *config = &kms->base.mode_config; 47 48 drm_mode_config_init(&kms->base); 49 50 config->min_width = 1; 51 config->min_height = 1; 52 config->max_width = 4096; 53 config->max_height = 4096; 54 config->normalize_zpos = true; 55 56 config->funcs = &dcss_drm_mode_config_funcs; 57 config->helper_private = &dcss_mode_config_helpers; 58 } 59 60 static const struct drm_encoder_funcs dcss_kms_simple_encoder_funcs = { 61 .destroy = drm_encoder_cleanup, 62 }; 63 64 static int dcss_kms_bridge_connector_init(struct dcss_kms_dev *kms) 65 { 66 struct drm_device *ddev = &kms->base; 67 struct drm_encoder *encoder = &kms->encoder; 68 struct drm_crtc *crtc = (struct drm_crtc *)&kms->crtc; 69 struct drm_panel *panel; 70 struct drm_bridge *bridge; 71 int ret; 72 73 ret = drm_of_find_panel_or_bridge(ddev->dev->of_node, 0, 0, 74 &panel, &bridge); 75 if (ret) 76 return ret; 77 78 if (!bridge) { 79 dev_err(ddev->dev, "No bridge found %d.\n", ret); 80 return -ENODEV; 81 } 82 83 encoder->possible_crtcs = drm_crtc_mask(crtc); 84 85 ret = drm_encoder_init(&kms->base, encoder, 86 &dcss_kms_simple_encoder_funcs, 87 DRM_MODE_ENCODER_NONE, NULL); 88 if (ret) { 89 dev_err(ddev->dev, "Failed initializing encoder %d.\n", ret); 90 return ret; 91 } 92 93 ret = drm_bridge_attach(encoder, bridge, NULL, 94 DRM_BRIDGE_ATTACH_NO_CONNECTOR); 95 if (ret < 0) 96 return ret; 97 98 kms->connector = drm_bridge_connector_init(ddev, encoder); 99 if (IS_ERR(kms->connector)) { 100 dev_err(ddev->dev, "Unable to create bridge connector.\n"); 101 return PTR_ERR(kms->connector); 102 } 103 104 drm_connector_attach_encoder(kms->connector, encoder); 105 106 return 0; 107 } 108 109 struct dcss_kms_dev *dcss_kms_attach(struct dcss_dev *dcss) 110 { 111 struct dcss_kms_dev *kms; 112 struct drm_device *drm; 113 struct dcss_crtc *crtc; 114 int ret; 115 116 kms = devm_drm_dev_alloc(dcss->dev, &dcss_kms_driver, 117 struct dcss_kms_dev, base); 118 if (IS_ERR(kms)) 119 return kms; 120 121 drm = &kms->base; 122 crtc = &kms->crtc; 123 124 drm->dev_private = dcss; 125 126 dcss_kms_mode_config_init(kms); 127 128 ret = drm_vblank_init(drm, 1); 129 if (ret) 130 goto cleanup_mode_config; 131 132 ret = dcss_kms_bridge_connector_init(kms); 133 if (ret) 134 goto cleanup_mode_config; 135 136 ret = dcss_crtc_init(crtc, drm); 137 if (ret) 138 goto cleanup_mode_config; 139 140 drm_mode_config_reset(drm); 141 142 drm_kms_helper_poll_init(drm); 143 144 ret = drm_dev_register(drm, 0); 145 if (ret) 146 goto cleanup_crtc; 147 148 drm_fbdev_generic_setup(drm, 32); 149 150 return kms; 151 152 cleanup_crtc: 153 drm_bridge_connector_disable_hpd(kms->connector); 154 drm_kms_helper_poll_fini(drm); 155 dcss_crtc_deinit(crtc, drm); 156 157 cleanup_mode_config: 158 drm_mode_config_cleanup(drm); 159 drm->dev_private = NULL; 160 161 return ERR_PTR(ret); 162 } 163 164 void dcss_kms_detach(struct dcss_kms_dev *kms) 165 { 166 struct drm_device *drm = &kms->base; 167 168 drm_dev_unregister(drm); 169 drm_bridge_connector_disable_hpd(kms->connector); 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