1 // SPDX-License-Identifier: GPL-2.0+ 2 /* 3 * RZ/G2L Display Unit Encoder 4 * 5 * Copyright (C) 2023 Renesas Electronics Corporation 6 * 7 * Based on rcar_du_encoder.c 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 "rzg2l_du_drv.h" 18 #include "rzg2l_du_encoder.h" 19 20 /* ----------------------------------------------------------------------------- 21 * Encoder 22 */ 23 24 static const struct drm_encoder_funcs rzg2l_du_encoder_funcs = { 25 }; 26 27 int rzg2l_du_encoder_init(struct rzg2l_du_device *rcdu, 28 enum rzg2l_du_output output, 29 struct device_node *enc_node) 30 { 31 struct rzg2l_du_encoder *renc; 32 struct drm_connector *connector; 33 struct drm_bridge *bridge; 34 int ret; 35 36 /* Locate the DRM bridge from the DT node. */ 37 bridge = of_drm_find_bridge(enc_node); 38 if (!bridge) 39 return -EPROBE_DEFER; 40 41 dev_dbg(rcdu->dev, "initializing encoder %pOF for output %s\n", 42 enc_node, rzg2l_du_output_name(output)); 43 44 renc = drmm_encoder_alloc(&rcdu->ddev, struct rzg2l_du_encoder, base, 45 &rzg2l_du_encoder_funcs, DRM_MODE_ENCODER_NONE, 46 NULL); 47 if (IS_ERR(renc)) 48 return PTR_ERR(renc); 49 50 renc->output = output; 51 52 /* Attach the bridge to the encoder. */ 53 ret = drm_bridge_attach(&renc->base, bridge, NULL, 54 DRM_BRIDGE_ATTACH_NO_CONNECTOR); 55 if (ret) { 56 dev_err(rcdu->dev, 57 "failed to attach bridge %pOF for output %s (%d)\n", 58 bridge->of_node, rzg2l_du_output_name(output), ret); 59 return ret; 60 } 61 62 /* Create the connector for the chain of bridges. */ 63 connector = drm_bridge_connector_init(&rcdu->ddev, &renc->base); 64 if (IS_ERR(connector)) { 65 dev_err(rcdu->dev, 66 "failed to created connector for output %s (%ld)\n", 67 rzg2l_du_output_name(output), PTR_ERR(connector)); 68 return PTR_ERR(connector); 69 } 70 71 return drm_connector_attach_encoder(connector, &renc->base); 72 } 73