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 __free(drm_bridge_put) = NULL; 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(no_free_ptr(bridge)); 74 75 /* 76 * The reference taken by devm_drm_panel_bridge_add_typed() is 77 * released automatically. Take a second one for the __free() 78 * when this function will return. 79 */ 80 drm_bridge_get(bridge); 81 } else { 82 bridge = of_drm_find_and_get_bridge(enc_node); 83 if (!bridge) 84 return -EPROBE_DEFER; 85 86 if (output == RCAR_DU_OUTPUT_LVDS0 || 87 output == RCAR_DU_OUTPUT_LVDS1) 88 rcdu->lvds[output - RCAR_DU_OUTPUT_LVDS0] = 89 drm_bridge_get(bridge); 90 91 if (output == RCAR_DU_OUTPUT_DSI0 || 92 output == RCAR_DU_OUTPUT_DSI1) 93 rcdu->dsi[output - RCAR_DU_OUTPUT_DSI0] = 94 drm_bridge_get(bridge); 95 } 96 97 /* 98 * Create and initialize the encoder. On Gen3, skip the LVDS1 output if 99 * the LVDS1 encoder is used as a companion for LVDS0 in dual-link 100 * mode, or any LVDS output if it isn't connected. The latter may happen 101 * on D3 or E3 as the LVDS encoders are needed to provide the pixel 102 * clock to the DU, even when the LVDS outputs are not used. 103 */ 104 if (rcdu->info->gen >= 3) { 105 if (output == RCAR_DU_OUTPUT_LVDS1 && 106 rcar_lvds_dual_link(bridge)) 107 return -ENOLINK; 108 109 if ((output == RCAR_DU_OUTPUT_LVDS0 || 110 output == RCAR_DU_OUTPUT_LVDS1) && 111 !rcar_lvds_is_connected(bridge)) 112 return -ENOLINK; 113 } 114 115 dev_dbg(rcdu->dev, "initializing encoder %pOF for output %s\n", 116 enc_node, rcar_du_output_name(output)); 117 118 renc = drmm_encoder_alloc(&rcdu->ddev, struct rcar_du_encoder, base, 119 &rcar_du_encoder_funcs, DRM_MODE_ENCODER_NONE, 120 NULL); 121 if (IS_ERR(renc)) 122 return PTR_ERR(renc); 123 124 renc->output = output; 125 126 /* Attach the bridge to the encoder. */ 127 ret = drm_bridge_attach(&renc->base, bridge, NULL, 128 DRM_BRIDGE_ATTACH_NO_CONNECTOR); 129 if (ret) { 130 dev_err(rcdu->dev, 131 "failed to attach bridge %pOF for output %s (%d)\n", 132 bridge->of_node, rcar_du_output_name(output), ret); 133 return ret; 134 } 135 136 /* Create the connector for the chain of bridges. */ 137 connector = drm_bridge_connector_init(&rcdu->ddev, &renc->base); 138 if (IS_ERR(connector)) { 139 dev_err(rcdu->dev, 140 "failed to created connector for output %s (%ld)\n", 141 rcar_du_output_name(output), PTR_ERR(connector)); 142 return PTR_ERR(connector); 143 } 144 145 return 0; 146 } 147 148 void rcar_du_encoder_cleanup(struct rcar_du_device *rcdu) 149 { 150 unsigned int i; 151 152 for (i = 0; i < ARRAY_SIZE(rcdu->lvds); i++) 153 drm_bridge_put(rcdu->lvds[i]); 154 for (i = 0; i < ARRAY_SIZE(rcdu->dsi); i++) 155 drm_bridge_put(rcdu->dsi[i]); 156 } 157