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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 | // SPDX-License-Identifier: GPL-2.0+ /* * rcar_du_encoder.c -- R-Car Display Unit Encoder * * Copyright (C) 2013-2014 Renesas Electronics Corporation * * Contact: Laurent Pinchart (laurent.pinchart@ideasonboard.com) */ #include <linux/export.h> #include <linux/slab.h> #include <drm/drm_bridge.h> #include <drm/drm_crtc.h> #include <drm/drm_managed.h> #include <drm/drm_modeset_helper_vtables.h> #include <drm/drm_panel.h> #include "rcar_du_drv.h" #include "rcar_du_encoder.h" #include "rcar_du_kms.h" #include "rcar_lvds.h" /* ----------------------------------------------------------------------------- * Encoder */ static unsigned int rcar_du_encoder_count_ports(struct device_node *node) { struct device_node *ports; struct device_node *port; unsigned int num_ports = 0; ports = of_get_child_by_name(node, "ports"); if (!ports) ports = of_node_get(node); for_each_child_of_node(ports, port) { if (of_node_name_eq(port, "port")) num_ports++; } of_node_put(ports); return num_ports; } static const struct drm_encoder_funcs rcar_du_encoder_funcs = { }; int rcar_du_encoder_init(struct rcar_du_device *rcdu, enum rcar_du_output output, struct device_node *enc_node) { struct rcar_du_encoder *renc; struct drm_bridge *bridge; /* * Locate the DRM bridge from the DT node. For the DPAD outputs, if the * DT node has a single port, assume that it describes a panel and * create a panel bridge. */ if ((output == RCAR_DU_OUTPUT_DPAD0 || output == RCAR_DU_OUTPUT_DPAD1) && rcar_du_encoder_count_ports(enc_node) == 1) { struct drm_panel *panel = of_drm_find_panel(enc_node); if (IS_ERR(panel)) return PTR_ERR(panel); bridge = devm_drm_panel_bridge_add_typed(rcdu->dev, panel, DRM_MODE_CONNECTOR_DPI); if (IS_ERR(bridge)) return PTR_ERR(bridge); } else { bridge = of_drm_find_bridge(enc_node); if (!bridge) return -EPROBE_DEFER; if (output == RCAR_DU_OUTPUT_LVDS0 || output == RCAR_DU_OUTPUT_LVDS1) rcdu->lvds[output - RCAR_DU_OUTPUT_LVDS0] = bridge; } /* * Create and initialize the encoder. On Gen3 skip the LVDS1 output if * the LVDS1 encoder is used as a companion for LVDS0 in dual-link * mode. */ if (rcdu->info->gen >= 3 && output == RCAR_DU_OUTPUT_LVDS1) { if (rcar_lvds_dual_link(bridge)) return -ENOLINK; } dev_dbg(rcdu->dev, "initializing encoder %pOF for output %u\n", enc_node, output); renc = drmm_encoder_alloc(&rcdu->ddev, struct rcar_du_encoder, base, &rcar_du_encoder_funcs, DRM_MODE_ENCODER_NONE, NULL); if (!renc) return -ENOMEM; renc->output = output; /* * Attach the bridge to the encoder. The bridge will create the * connector. */ return drm_bridge_attach(&renc->base, bridge, NULL, 0); } |