1 // SPDX-License-Identifier: GPL-2.0+ 2 /* 3 * R-Car Display Unit Encoder 4 * 5 * Copyright (C) 2013-2014 Renesas Electronics Corporation 6 * 7 * Contact: Laurent Pinchart (laurent.pinchart@ideasonboard.com) 8 */ 9 10 #include <linux/export.h> 11 #include <linux/of.h> 12 13 #include <drm/drm_bridge.h> 14 #include <drm/drm_bridge_connector.h> 15 #include <drm/drm_panel.h> 16 17 #include "rcar_du_drv.h" 18 #include "rcar_du_encoder.h" 19 #include "rcar_lvds.h" 20 21 /* ----------------------------------------------------------------------------- 22 * Encoder 23 */ 24 25 static unsigned int rcar_du_encoder_count_ports(struct device_node *node) 26 { 27 struct device_node *ports; 28 struct device_node *port; 29 unsigned int num_ports = 0; 30 31 ports = of_get_child_by_name(node, "ports"); 32 if (!ports) 33 ports = of_node_get(node); 34 35 for_each_child_of_node(ports, port) { 36 if (of_node_name_eq(port, "port")) 37 num_ports++; 38 } 39 40 of_node_put(ports); 41 42 return num_ports; 43 } 44 45 static const struct drm_encoder_funcs rcar_du_encoder_funcs = { 46 }; 47 48 int rcar_du_encoder_init(struct rcar_du_device *rcdu, 49 enum rcar_du_output output, 50 struct device_node *enc_node) 51 { 52 struct rcar_du_encoder *renc; 53 struct drm_connector *connector; 54 struct drm_bridge *bridge; 55 int ret; 56 57 /* 58 * Locate the DRM bridge from the DT node. For the DPAD outputs, if the 59 * DT node has a single port, assume that it describes a panel and 60 * create a panel bridge. 61 */ 62 if ((output == RCAR_DU_OUTPUT_DPAD0 || 63 output == RCAR_DU_OUTPUT_DPAD1) && 64 rcar_du_encoder_count_ports(enc_node) == 1) { 65 struct drm_panel *panel = of_drm_find_panel(enc_node); 66 67 if (IS_ERR(panel)) 68 return PTR_ERR(panel); 69 70 bridge = devm_drm_panel_bridge_add_typed(rcdu->dev, panel, 71 DRM_MODE_CONNECTOR_DPI); 72 if (IS_ERR(bridge)) 73 return PTR_ERR(bridge); 74 } else { 75 bridge = of_drm_find_bridge(enc_node); 76 if (!bridge) 77 return -EPROBE_DEFER; 78 79 if (output == RCAR_DU_OUTPUT_LVDS0 || 80 output == RCAR_DU_OUTPUT_LVDS1) 81 rcdu->lvds[output - RCAR_DU_OUTPUT_LVDS0] = bridge; 82 83 if (output == RCAR_DU_OUTPUT_DSI0 || 84 output == RCAR_DU_OUTPUT_DSI1) 85 rcdu->dsi[output - RCAR_DU_OUTPUT_DSI0] = bridge; 86 } 87 88 /* 89 * Create and initialize the encoder. On Gen3, skip the LVDS1 output if 90 * the LVDS1 encoder is used as a companion for LVDS0 in dual-link 91 * mode, or any LVDS output if it isn't connected. The latter may happen 92 * on D3 or E3 as the LVDS encoders are needed to provide the pixel 93 * clock to the DU, even when the LVDS outputs are not used. 94 */ 95 if (rcdu->info->gen >= 3) { 96 if (output == RCAR_DU_OUTPUT_LVDS1 && 97 rcar_lvds_dual_link(bridge)) 98 return -ENOLINK; 99 100 if ((output == RCAR_DU_OUTPUT_LVDS0 || 101 output == RCAR_DU_OUTPUT_LVDS1) && 102 !rcar_lvds_is_connected(bridge)) 103 return -ENOLINK; 104 } 105 106 dev_dbg(rcdu->dev, "initializing encoder %pOF for output %s\n", 107 enc_node, rcar_du_output_name(output)); 108 109 renc = drmm_encoder_alloc(&rcdu->ddev, struct rcar_du_encoder, base, 110 &rcar_du_encoder_funcs, DRM_MODE_ENCODER_NONE, 111 NULL); 112 if (IS_ERR(renc)) 113 return PTR_ERR(renc); 114 115 renc->output = output; 116 117 /* Attach the bridge to the encoder. */ 118 ret = drm_bridge_attach(&renc->base, bridge, NULL, 119 DRM_BRIDGE_ATTACH_NO_CONNECTOR); 120 if (ret) { 121 dev_err(rcdu->dev, 122 "failed to attach bridge %pOF for output %s (%d)\n", 123 bridge->of_node, rcar_du_output_name(output), ret); 124 return ret; 125 } 126 127 /* Create the connector for the chain of bridges. */ 128 connector = drm_bridge_connector_init(&rcdu->ddev, &renc->base); 129 if (IS_ERR(connector)) { 130 dev_err(rcdu->dev, 131 "failed to created connector for output %s (%ld)\n", 132 rcar_du_output_name(output), PTR_ERR(connector)); 133 return PTR_ERR(connector); 134 } 135 136 return drm_connector_attach_encoder(connector, &renc->base); 137 } 138