1 // SPDX-License-Identifier: GPL-2.0+ 2 3 #include "vkms_drv.h" 4 #include <drm/drm_atomic_helper.h> 5 #include <drm/drm_edid.h> 6 #include <drm/drm_probe_helper.h> 7 8 static const struct drm_connector_funcs vkms_connector_funcs = { 9 .fill_modes = drm_helper_probe_single_connector_modes, 10 .destroy = drm_connector_cleanup, 11 .reset = drm_atomic_helper_connector_reset, 12 .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state, 13 .atomic_destroy_state = drm_atomic_helper_connector_destroy_state, 14 }; 15 16 static const struct drm_encoder_funcs vkms_encoder_funcs = { 17 .destroy = drm_encoder_cleanup, 18 }; 19 20 static int vkms_conn_get_modes(struct drm_connector *connector) 21 { 22 int count; 23 24 /* Use the default modes list from DRM */ 25 count = drm_add_modes_noedid(connector, XRES_MAX, YRES_MAX); 26 drm_set_preferred_mode(connector, XRES_DEF, YRES_DEF); 27 28 return count; 29 } 30 31 static const struct drm_connector_helper_funcs vkms_conn_helper_funcs = { 32 .get_modes = vkms_conn_get_modes, 33 }; 34 35 static int vkms_add_overlay_plane(struct vkms_device *vkmsdev, int index, 36 struct drm_crtc *crtc) 37 { 38 struct vkms_plane *overlay; 39 40 overlay = vkms_plane_init(vkmsdev, DRM_PLANE_TYPE_OVERLAY, index); 41 if (IS_ERR(overlay)) 42 return PTR_ERR(overlay); 43 44 if (!overlay->base.possible_crtcs) 45 overlay->base.possible_crtcs = drm_crtc_mask(crtc); 46 47 return 0; 48 } 49 50 int vkms_output_init(struct vkms_device *vkmsdev, int index) 51 { 52 struct vkms_output *output = &vkmsdev->output; 53 struct drm_device *dev = &vkmsdev->drm; 54 struct drm_connector *connector = &output->connector; 55 struct drm_encoder *encoder = &output->encoder; 56 struct drm_crtc *crtc = &output->crtc; 57 struct vkms_plane *primary, *cursor = NULL; 58 int ret; 59 int writeback; 60 unsigned int n; 61 62 /* 63 * Initialize used plane. One primary plane is required to perform the composition. 64 * 65 * The overlay and cursor planes are not mandatory, but can be used to perform complex 66 * composition. 67 */ 68 primary = vkms_plane_init(vkmsdev, DRM_PLANE_TYPE_PRIMARY, index); 69 if (IS_ERR(primary)) 70 return PTR_ERR(primary); 71 72 if (vkmsdev->config->overlay) { 73 for (n = 0; n < NUM_OVERLAY_PLANES; n++) { 74 ret = vkms_add_overlay_plane(vkmsdev, index, crtc); 75 if (ret) 76 return ret; 77 } 78 } 79 80 if (vkmsdev->config->cursor) { 81 cursor = vkms_plane_init(vkmsdev, DRM_PLANE_TYPE_CURSOR, index); 82 if (IS_ERR(cursor)) 83 return PTR_ERR(cursor); 84 } 85 86 /* [1]: Allocation of a CRTC, its index will be BIT(0) = 1 */ 87 ret = vkms_crtc_init(dev, crtc, &primary->base, &cursor->base); 88 if (ret) 89 return ret; 90 91 ret = drm_connector_init(dev, connector, &vkms_connector_funcs, 92 DRM_MODE_CONNECTOR_VIRTUAL); 93 if (ret) { 94 DRM_ERROR("Failed to init connector\n"); 95 return ret; 96 } 97 98 drm_connector_helper_add(connector, &vkms_conn_helper_funcs); 99 100 ret = drm_encoder_init(dev, encoder, &vkms_encoder_funcs, 101 DRM_MODE_ENCODER_VIRTUAL, NULL); 102 if (ret) { 103 DRM_ERROR("Failed to init encoder\n"); 104 goto err_encoder; 105 } 106 /* 107 * This is a hardcoded value to select crtc for the encoder. 108 * BIT(0) here designate the first registered CRTC, the one allocated in [1] 109 */ 110 encoder->possible_crtcs = BIT(0); 111 112 ret = drm_connector_attach_encoder(connector, encoder); 113 if (ret) { 114 DRM_ERROR("Failed to attach connector to encoder\n"); 115 goto err_attach; 116 } 117 118 if (vkmsdev->config->writeback) { 119 writeback = vkms_enable_writeback_connector(vkmsdev); 120 if (writeback) 121 DRM_ERROR("Failed to init writeback connector\n"); 122 } 123 124 drm_mode_config_reset(dev); 125 126 return 0; 127 128 err_attach: 129 drm_encoder_cleanup(encoder); 130 131 err_encoder: 132 drm_connector_cleanup(connector); 133 134 return ret; 135 } 136