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_atomic_helper.h> 14 #include <drm/drm_bridge.h> 15 #include <drm/drm_bridge_connector.h> 16 #include <drm/drm_panel.h> 17 18 #include "rzg2l_du_drv.h" 19 #include "rzg2l_du_encoder.h" 20 21 /* ----------------------------------------------------------------------------- 22 * Encoder 23 */ 24 25 static const struct drm_encoder_funcs rzg2l_du_encoder_funcs = { 26 }; 27 28 static enum drm_mode_status 29 rzg2l_du_encoder_mode_valid(struct drm_encoder *encoder, 30 const struct drm_display_mode *mode) 31 { 32 struct rzg2l_du_encoder *renc = to_rzg2l_encoder(encoder); 33 34 if (renc->output == RZG2L_DU_OUTPUT_DPAD0 && mode->clock > 83500) 35 return MODE_CLOCK_HIGH; 36 37 return MODE_OK; 38 } 39 40 static const struct drm_encoder_helper_funcs rzg2l_du_encoder_helper_funcs = { 41 .mode_valid = rzg2l_du_encoder_mode_valid, 42 }; 43 44 int rzg2l_du_encoder_init(struct rzg2l_du_device *rcdu, 45 enum rzg2l_du_output output, 46 struct device_node *enc_node) 47 { 48 struct rzg2l_du_encoder *renc; 49 struct drm_connector *connector; 50 struct drm_bridge *bridge; 51 int ret; 52 53 /* Locate the DRM bridge from the DT node. */ 54 bridge = of_drm_find_bridge(enc_node); 55 if (!bridge) 56 return -EPROBE_DEFER; 57 58 dev_dbg(rcdu->dev, "initializing encoder %pOF for output %s\n", 59 enc_node, rzg2l_du_output_name(output)); 60 61 renc = drmm_encoder_alloc(&rcdu->ddev, struct rzg2l_du_encoder, base, 62 &rzg2l_du_encoder_funcs, DRM_MODE_ENCODER_NONE, 63 NULL); 64 if (IS_ERR(renc)) 65 return PTR_ERR(renc); 66 67 renc->output = output; 68 drm_encoder_helper_add(&renc->base, &rzg2l_du_encoder_helper_funcs); 69 70 /* Attach the bridge to the encoder. */ 71 ret = drm_bridge_attach(&renc->base, bridge, NULL, 72 DRM_BRIDGE_ATTACH_NO_CONNECTOR); 73 if (ret) { 74 dev_err(rcdu->dev, 75 "failed to attach bridge %pOF for output %s (%d)\n", 76 bridge->of_node, rzg2l_du_output_name(output), ret); 77 return ret; 78 } 79 80 /* Create the connector for the chain of bridges. */ 81 connector = drm_bridge_connector_init(&rcdu->ddev, &renc->base); 82 if (IS_ERR(connector)) { 83 dev_err(rcdu->dev, 84 "failed to created connector for output %s (%ld)\n", 85 rzg2l_du_output_name(output), PTR_ERR(connector)); 86 return PTR_ERR(connector); 87 } 88 89 return drm_connector_attach_encoder(connector, &renc->base); 90 } 91