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(bridge);
40
41	return drm_bridge_attach(bridge->encoder, t_enc->next_bridge,
42				 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(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
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(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