1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Copyright (C) 2015 Texas Instruments 4 * Author: Jyri Sarha <jsarha@ti.com> 5 */ 6 7 #include <linux/component.h> 8 #include <linux/of_graph.h> 9 10 #include <drm/drm_atomic_helper.h> 11 #include <drm/drm_bridge.h> 12 #include <drm/drm_of.h> 13 14 #include "tilcdc_drv.h" 15 #include "tilcdc_external.h" 16 17 static const struct tilcdc_panel_info panel_info_tda998x = { 18 .ac_bias = 255, 19 .ac_bias_intrpt = 0, 20 .dma_burst_sz = 16, 21 .bpp = 16, 22 .fdd = 0x80, 23 .tft_alt_mode = 0, 24 .invert_pxl_clk = 1, 25 .sync_edge = 1, 26 .sync_ctrl = 1, 27 .raster_order = 0, 28 }; 29 30 static const struct tilcdc_panel_info panel_info_default = { 31 .ac_bias = 255, 32 .ac_bias_intrpt = 0, 33 .dma_burst_sz = 16, 34 .bpp = 16, 35 .fdd = 0x80, 36 .tft_alt_mode = 0, 37 .sync_edge = 0, 38 .sync_ctrl = 1, 39 .raster_order = 0, 40 }; 41 42 static 43 struct drm_connector *tilcdc_encoder_find_connector(struct drm_device *ddev, 44 struct drm_encoder *encoder) 45 { 46 struct drm_connector *connector; 47 48 list_for_each_entry(connector, &ddev->mode_config.connector_list, head) { 49 if (drm_connector_has_possible_encoder(connector, encoder)) 50 return connector; 51 } 52 53 dev_err(ddev->dev, "No connector found for %s encoder (id %d)\n", 54 encoder->name, encoder->base.id); 55 56 return NULL; 57 } 58 59 int tilcdc_add_component_encoder(struct drm_device *ddev) 60 { 61 struct tilcdc_drm_private *priv = ddev->dev_private; 62 struct drm_encoder *encoder; 63 64 list_for_each_entry(encoder, &ddev->mode_config.encoder_list, head) 65 if (encoder->possible_crtcs & (1 << priv->crtc->index)) 66 break; 67 68 if (!encoder) { 69 dev_err(ddev->dev, "%s: No suitable encoder found\n", __func__); 70 return -ENODEV; 71 } 72 73 priv->external_connector = 74 tilcdc_encoder_find_connector(ddev, encoder); 75 76 if (!priv->external_connector) 77 return -ENODEV; 78 79 /* Only tda998x is supported at the moment. */ 80 tilcdc_crtc_set_simulate_vesa_sync(priv->crtc, true); 81 tilcdc_crtc_set_panel_info(priv->crtc, &panel_info_tda998x); 82 83 return 0; 84 } 85 86 static const struct drm_encoder_funcs tilcdc_external_encoder_funcs = { 87 .destroy = drm_encoder_cleanup, 88 }; 89 90 static 91 int tilcdc_attach_bridge(struct drm_device *ddev, struct drm_bridge *bridge) 92 { 93 struct tilcdc_drm_private *priv = ddev->dev_private; 94 int ret; 95 96 priv->external_encoder->possible_crtcs = BIT(0); 97 98 ret = drm_bridge_attach(priv->external_encoder, bridge, NULL); 99 if (ret) { 100 dev_err(ddev->dev, "drm_bridge_attach() failed %d\n", ret); 101 return ret; 102 } 103 104 tilcdc_crtc_set_panel_info(priv->crtc, &panel_info_default); 105 106 priv->external_connector = 107 tilcdc_encoder_find_connector(ddev, priv->external_encoder); 108 if (!priv->external_connector) 109 return -ENODEV; 110 111 return 0; 112 } 113 114 int tilcdc_attach_external_device(struct drm_device *ddev) 115 { 116 struct tilcdc_drm_private *priv = ddev->dev_private; 117 struct drm_bridge *bridge; 118 struct drm_panel *panel; 119 int ret; 120 121 ret = drm_of_find_panel_or_bridge(ddev->dev->of_node, 0, 0, 122 &panel, &bridge); 123 if (ret == -ENODEV) 124 return 0; 125 else if (ret) 126 return ret; 127 128 priv->external_encoder = devm_kzalloc(ddev->dev, 129 sizeof(*priv->external_encoder), 130 GFP_KERNEL); 131 if (!priv->external_encoder) 132 return -ENOMEM; 133 134 ret = drm_encoder_init(ddev, priv->external_encoder, 135 &tilcdc_external_encoder_funcs, 136 DRM_MODE_ENCODER_NONE, NULL); 137 if (ret) { 138 dev_err(ddev->dev, "drm_encoder_init() failed %d\n", ret); 139 return ret; 140 } 141 142 if (panel) { 143 bridge = devm_drm_panel_bridge_add_typed(ddev->dev, panel, 144 DRM_MODE_CONNECTOR_DPI); 145 if (IS_ERR(bridge)) { 146 ret = PTR_ERR(bridge); 147 goto err_encoder_cleanup; 148 } 149 } 150 151 ret = tilcdc_attach_bridge(ddev, bridge); 152 if (ret) 153 goto err_encoder_cleanup; 154 155 return 0; 156 157 err_encoder_cleanup: 158 drm_encoder_cleanup(priv->external_encoder); 159 return ret; 160 } 161 162 static int dev_match_of(struct device *dev, void *data) 163 { 164 return dev->of_node == data; 165 } 166 167 int tilcdc_get_external_components(struct device *dev, 168 struct component_match **match) 169 { 170 struct device_node *node; 171 172 node = of_graph_get_remote_node(dev->of_node, 0, 0); 173 174 if (!of_device_is_compatible(node, "nxp,tda998x")) { 175 of_node_put(node); 176 return 0; 177 } 178 179 if (match) 180 drm_of_component_match_add(dev, match, dev_match_of, node); 181 of_node_put(node); 182 return 1; 183 } 184