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/of_graph.h> 8 9 #include <drm/drm_atomic_helper.h> 10 #include <drm/drm_bridge.h> 11 #include <drm/drm_of.h> 12 #include <drm/drm_simple_kms_helper.h> 13 14 #include "tilcdc_drv.h" 15 #include "tilcdc_encoder.h" 16 17 static 18 struct drm_connector *tilcdc_encoder_find_connector(struct drm_device *ddev, 19 struct drm_encoder *encoder) 20 { 21 struct drm_connector *connector; 22 23 list_for_each_entry(connector, &ddev->mode_config.connector_list, head) { 24 if (drm_connector_has_possible_encoder(connector, encoder)) 25 return connector; 26 } 27 28 dev_err(ddev->dev, "No connector found for %s encoder (id %d)\n", 29 encoder->name, encoder->base.id); 30 31 return NULL; 32 } 33 34 static 35 int tilcdc_attach_bridge(struct drm_device *ddev, struct drm_bridge *bridge) 36 { 37 struct tilcdc_drm_private *priv = ddev->dev_private; 38 int ret; 39 40 priv->encoder->possible_crtcs = BIT(0); 41 42 ret = drm_bridge_attach(priv->encoder, bridge, NULL, 0); 43 if (ret) 44 return ret; 45 46 priv->connector = tilcdc_encoder_find_connector(ddev, priv->encoder); 47 if (!priv->connector) 48 return -ENODEV; 49 50 return 0; 51 } 52 53 int tilcdc_encoder_create(struct drm_device *ddev) 54 { 55 struct tilcdc_drm_private *priv = ddev->dev_private; 56 struct drm_bridge *bridge; 57 struct drm_panel *panel; 58 int ret; 59 60 ret = drm_of_find_panel_or_bridge(ddev->dev->of_node, 0, 0, 61 &panel, &bridge); 62 if (ret == -ENODEV) 63 return 0; 64 else if (ret) 65 return ret; 66 67 priv->encoder = devm_kzalloc(ddev->dev, sizeof(*priv->encoder), GFP_KERNEL); 68 if (!priv->encoder) 69 return -ENOMEM; 70 71 ret = drm_simple_encoder_init(ddev, priv->encoder, 72 DRM_MODE_ENCODER_NONE); 73 if (ret) { 74 dev_err(ddev->dev, "drm_encoder_init() failed %d\n", ret); 75 return ret; 76 } 77 78 if (panel) { 79 bridge = devm_drm_panel_bridge_add_typed(ddev->dev, panel, 80 DRM_MODE_CONNECTOR_DPI); 81 if (IS_ERR(bridge)) { 82 ret = PTR_ERR(bridge); 83 goto err_encoder_cleanup; 84 } 85 } 86 87 ret = tilcdc_attach_bridge(ddev, bridge); 88 if (ret) 89 goto err_encoder_cleanup; 90 91 return 0; 92 93 err_encoder_cleanup: 94 drm_encoder_cleanup(priv->encoder); 95 return ret; 96 } 97