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 drm_err(ddev, "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_to_tilcdc_priv(ddev); 38 int ret; 39 40 priv->encoder->base.possible_crtcs = BIT(0); 41 42 ret = drm_bridge_attach(&priv->encoder->base, bridge, NULL, 0); 43 if (ret) 44 return ret; 45 46 priv->connector = tilcdc_encoder_find_connector(ddev, &priv->encoder->base); 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_to_tilcdc_priv(ddev); 56 struct tilcdc_encoder *encoder; 57 struct drm_bridge *bridge; 58 struct drm_panel *panel; 59 int ret; 60 61 ret = drm_of_find_panel_or_bridge(ddev->dev->of_node, 0, 0, 62 &panel, &bridge); 63 if (ret == -ENODEV) 64 return 0; 65 else if (ret) 66 return ret; 67 68 encoder = drmm_simple_encoder_alloc(ddev, struct tilcdc_encoder, 69 base, DRM_MODE_ENCODER_NONE); 70 if (IS_ERR(encoder)) { 71 drm_err(ddev, "drm_encoder_init() failed %pe\n", encoder); 72 return PTR_ERR(encoder); 73 } 74 priv->encoder = encoder; 75 76 if (panel) { 77 bridge = devm_drm_panel_bridge_add_typed(ddev->dev, panel, 78 DRM_MODE_CONNECTOR_DPI); 79 if (IS_ERR(bridge)) 80 return PTR_ERR(bridge); 81 } 82 83 return tilcdc_attach_bridge(ddev, bridge); 84 } 85