1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * Copyright (C) 2018 Texas Instruments Incorporated - https://www.ti.com/ 4 * Author: Tomi Valkeinen <tomi.valkeinen@ti.com> 5 */ 6 7 #include <linux/export.h> 8 9 #include <drm/drm_atomic_helper.h> 10 #include <drm/drm_bridge.h> 11 #include <drm/drm_bridge_connector.h> 12 #include <drm/drm_crtc.h> 13 #include <drm/drm_modeset_helper_vtables.h> 14 #include <drm/drm_panel.h> 15 #include <drm/drm_of.h> 16 #include <drm/drm_simple_kms_helper.h> 17 18 #include "tidss_crtc.h" 19 #include "tidss_drv.h" 20 #include "tidss_encoder.h" 21 22 struct tidss_encoder { 23 struct drm_bridge bridge; 24 struct drm_encoder encoder; 25 struct drm_connector *connector; 26 struct drm_bridge *next_bridge; 27 struct tidss_device *tidss; 28 }; 29 30 static inline struct tidss_encoder 31 *bridge_to_tidss_encoder(struct drm_bridge *b) 32 { 33 return container_of(b, struct tidss_encoder, bridge); 34 } 35 36 static int tidss_bridge_attach(struct drm_bridge *bridge, 37 enum drm_bridge_attach_flags flags) 38 { 39 struct tidss_encoder *t_enc = bridge_to_tidss_encoder(bridge); 40 41 return drm_bridge_attach(bridge->encoder, t_enc->next_bridge, 42 bridge, flags); 43 } 44 45 static int tidss_bridge_atomic_check(struct drm_bridge *bridge, 46 struct drm_bridge_state *bridge_state, 47 struct drm_crtc_state *crtc_state, 48 struct drm_connector_state *conn_state) 49 { 50 struct tidss_encoder *t_enc = bridge_to_tidss_encoder(bridge); 51 struct tidss_device *tidss = t_enc->tidss; 52 struct tidss_crtc_state *tcrtc_state = to_tidss_crtc_state(crtc_state); 53 struct drm_display_info *di = &conn_state->connector->display_info; 54 struct drm_bridge_state *next_bridge_state = NULL; 55 56 if (t_enc->next_bridge) 57 next_bridge_state = drm_atomic_get_new_bridge_state(crtc_state->state, 58 t_enc->next_bridge); 59 60 if (next_bridge_state) { 61 tcrtc_state->bus_flags = next_bridge_state->input_bus_cfg.flags; 62 tcrtc_state->bus_format = next_bridge_state->input_bus_cfg.format; 63 } else if (di->num_bus_formats) { 64 tcrtc_state->bus_format = di->bus_formats[0]; 65 tcrtc_state->bus_flags = di->bus_flags; 66 } else { 67 dev_err(tidss->dev, "%s: No bus_formats in connected display\n", 68 __func__); 69 return -EINVAL; 70 } 71 72 return 0; 73 } 74 75 static const struct drm_bridge_funcs tidss_bridge_funcs = { 76 .attach = tidss_bridge_attach, 77 .atomic_check = tidss_bridge_atomic_check, 78 .atomic_reset = drm_atomic_helper_bridge_reset, 79 .atomic_duplicate_state = drm_atomic_helper_bridge_duplicate_state, 80 .atomic_destroy_state = drm_atomic_helper_bridge_destroy_state, 81 }; 82 83 int tidss_encoder_create(struct tidss_device *tidss, 84 struct drm_bridge *next_bridge, 85 u32 encoder_type, u32 possible_crtcs) 86 { 87 struct tidss_encoder *t_enc; 88 struct drm_encoder *enc; 89 struct drm_connector *connector; 90 int ret; 91 92 t_enc = drmm_simple_encoder_alloc(&tidss->ddev, struct tidss_encoder, 93 encoder, encoder_type); 94 if (IS_ERR(t_enc)) 95 return PTR_ERR(t_enc); 96 97 t_enc->tidss = tidss; 98 t_enc->next_bridge = next_bridge; 99 t_enc->bridge.funcs = &tidss_bridge_funcs; 100 101 enc = &t_enc->encoder; 102 enc->possible_crtcs = possible_crtcs; 103 104 /* Attaching first bridge to the encoder */ 105 ret = drm_bridge_attach(enc, &t_enc->bridge, NULL, 106 DRM_BRIDGE_ATTACH_NO_CONNECTOR); 107 if (ret) { 108 dev_err(tidss->dev, "bridge attach failed: %d\n", ret); 109 return ret; 110 } 111 112 /* Initializing the connector at the end of bridge-chain */ 113 connector = drm_bridge_connector_init(&tidss->ddev, enc); 114 if (IS_ERR(connector)) { 115 dev_err(tidss->dev, "bridge_connector create failed\n"); 116 return PTR_ERR(connector); 117 } 118 119 ret = drm_connector_attach_encoder(connector, enc); 120 if (ret) { 121 dev_err(tidss->dev, "attaching encoder to connector failed\n"); 122 return ret; 123 } 124 125 t_enc->connector = connector; 126 127 dev_dbg(tidss->dev, "Encoder create done\n"); 128 129 return ret; 130 } 131