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
22struct 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
30static 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
36static 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(b: bridge);
40
41 return drm_bridge_attach(encoder: bridge->encoder, bridge: t_enc->next_bridge,
42 previous: bridge, flags);
43}
44
45static 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(b: 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(state: crtc_state->state,
58 bridge: 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
75static 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
83int 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(ptr: t_enc))
95 return PTR_ERR(ptr: 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(encoder: enc, bridge: &t_enc->bridge, NULL,
106 flags: 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(drm: &tidss->ddev, encoder: enc);
114 if (IS_ERR(ptr: connector)) {
115 dev_err(tidss->dev, "bridge_connector create failed\n");
116 return PTR_ERR(ptr: connector);
117 }
118
119 ret = drm_connector_attach_encoder(connector, encoder: 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

source code of linux/drivers/gpu/drm/tidss/tidss_encoder.c