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 struct drm_encoder *encoder, 38 enum drm_bridge_attach_flags flags) 39 { 40 struct tidss_encoder *t_enc = bridge_to_tidss_encoder(bridge); 41 42 return drm_bridge_attach(encoder, t_enc->next_bridge, 43 bridge, flags); 44 } 45 46 static int tidss_bridge_atomic_check(struct drm_bridge *bridge, 47 struct drm_bridge_state *bridge_state, 48 struct drm_crtc_state *crtc_state, 49 struct drm_connector_state *conn_state) 50 { 51 struct tidss_encoder *t_enc = bridge_to_tidss_encoder(bridge); 52 struct tidss_device *tidss = t_enc->tidss; 53 struct tidss_crtc_state *tcrtc_state = to_tidss_crtc_state(crtc_state); 54 struct drm_display_info *di = &conn_state->connector->display_info; 55 struct drm_bridge_state *next_bridge_state = NULL; 56 57 if (t_enc->next_bridge) 58 next_bridge_state = drm_atomic_get_new_bridge_state(crtc_state->state, 59 t_enc->next_bridge); 60 61 if (next_bridge_state) { 62 tcrtc_state->bus_flags = next_bridge_state->input_bus_cfg.flags; 63 tcrtc_state->bus_format = next_bridge_state->input_bus_cfg.format; 64 } else if (di->num_bus_formats) { 65 tcrtc_state->bus_format = di->bus_formats[0]; 66 tcrtc_state->bus_flags = di->bus_flags; 67 } else { 68 dev_err(tidss->dev, "%s: No bus_formats in connected display\n", 69 __func__); 70 return -EINVAL; 71 } 72 73 return 0; 74 } 75 76 static const struct drm_bridge_funcs tidss_bridge_funcs = { 77 .attach = tidss_bridge_attach, 78 .atomic_check = tidss_bridge_atomic_check, 79 .atomic_reset = drm_atomic_helper_bridge_reset, 80 .atomic_duplicate_state = drm_atomic_helper_bridge_duplicate_state, 81 .atomic_destroy_state = drm_atomic_helper_bridge_destroy_state, 82 }; 83 84 int tidss_encoder_create(struct tidss_device *tidss, 85 struct drm_bridge *next_bridge, 86 u32 encoder_type, u32 possible_crtcs) 87 { 88 struct tidss_encoder *t_enc; 89 struct drm_encoder *enc; 90 struct drm_connector *connector; 91 int ret; 92 93 t_enc = drmm_simple_encoder_alloc(&tidss->ddev, struct tidss_encoder, 94 encoder, encoder_type); 95 if (IS_ERR(t_enc)) 96 return PTR_ERR(t_enc); 97 98 t_enc->tidss = tidss; 99 t_enc->next_bridge = next_bridge; 100 t_enc->bridge.funcs = &tidss_bridge_funcs; 101 102 enc = &t_enc->encoder; 103 enc->possible_crtcs = possible_crtcs; 104 105 /* Attaching first bridge to the encoder */ 106 ret = drm_bridge_attach(enc, &t_enc->bridge, NULL, 107 DRM_BRIDGE_ATTACH_NO_CONNECTOR); 108 if (ret) { 109 dev_err(tidss->dev, "bridge attach failed: %d\n", ret); 110 return ret; 111 } 112 113 /* Initializing the connector at the end of bridge-chain */ 114 connector = drm_bridge_connector_init(&tidss->ddev, enc); 115 if (IS_ERR(connector)) { 116 dev_err(tidss->dev, "bridge_connector create failed\n"); 117 return PTR_ERR(connector); 118 } 119 120 ret = drm_connector_attach_encoder(connector, enc); 121 if (ret) { 122 dev_err(tidss->dev, "attaching encoder to connector failed\n"); 123 return ret; 124 } 125 126 t_enc->connector = connector; 127 128 dev_dbg(tidss->dev, "Encoder create done\n"); 129 130 return ret; 131 } 132