1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * Copyright (C) 2016 BayLibre, SAS
4 * Author: Neil Armstrong <narmstrong@baylibre.com>
5 * Copyright (C) 2015 Amlogic, Inc. All rights reserved.
6 */
7
8 #include <linux/kernel.h>
9 #include <linux/module.h>
10 #include <linux/of_graph.h>
11
12 #include <drm/drm_atomic_helper.h>
13 #include <drm/drm_simple_kms_helper.h>
14 #include <drm/drm_bridge.h>
15 #include <drm/drm_bridge_connector.h>
16 #include <drm/drm_device.h>
17 #include <drm/drm_probe_helper.h>
18
19 #include "meson_drv.h"
20 #include "meson_encoder_dsi.h"
21 #include "meson_registers.h"
22 #include "meson_venc.h"
23 #include "meson_vclk.h"
24
25 struct meson_encoder_dsi {
26 struct drm_encoder encoder;
27 struct drm_bridge bridge;
28 struct drm_bridge *next_bridge;
29 struct meson_drm *priv;
30 };
31
32 #define bridge_to_meson_encoder_dsi(x) \
33 container_of(x, struct meson_encoder_dsi, bridge)
34
meson_encoder_dsi_attach(struct drm_bridge * bridge,enum drm_bridge_attach_flags flags)35 static int meson_encoder_dsi_attach(struct drm_bridge *bridge,
36 enum drm_bridge_attach_flags flags)
37 {
38 struct meson_encoder_dsi *encoder_dsi = bridge_to_meson_encoder_dsi(bridge);
39
40 return drm_bridge_attach(bridge->encoder, encoder_dsi->next_bridge,
41 &encoder_dsi->bridge, flags);
42 }
43
meson_encoder_dsi_atomic_enable(struct drm_bridge * bridge,struct drm_bridge_state * bridge_state)44 static void meson_encoder_dsi_atomic_enable(struct drm_bridge *bridge,
45 struct drm_bridge_state *bridge_state)
46 {
47 struct meson_encoder_dsi *encoder_dsi = bridge_to_meson_encoder_dsi(bridge);
48 struct drm_atomic_state *state = bridge_state->base.state;
49 struct meson_drm *priv = encoder_dsi->priv;
50 struct drm_connector_state *conn_state;
51 struct drm_crtc_state *crtc_state;
52 struct drm_connector *connector;
53
54 connector = drm_atomic_get_new_connector_for_encoder(state, bridge->encoder);
55 if (WARN_ON(!connector))
56 return;
57
58 conn_state = drm_atomic_get_new_connector_state(state, connector);
59 if (WARN_ON(!conn_state))
60 return;
61
62 crtc_state = drm_atomic_get_new_crtc_state(state, conn_state->crtc);
63 if (WARN_ON(!crtc_state))
64 return;
65
66 /* ENCL clock setup is handled by CCF */
67
68 meson_venc_mipi_dsi_mode_set(priv, &crtc_state->adjusted_mode);
69 meson_encl_load_gamma(priv);
70
71 writel_relaxed(0, priv->io_base + _REG(ENCL_VIDEO_EN));
72
73 writel_bits_relaxed(ENCL_VIDEO_MODE_ADV_VFIFO_EN, ENCL_VIDEO_MODE_ADV_VFIFO_EN,
74 priv->io_base + _REG(ENCL_VIDEO_MODE_ADV));
75 writel_relaxed(0, priv->io_base + _REG(ENCL_TST_EN));
76
77 writel_bits_relaxed(BIT(0), 0, priv->io_base + _REG(VPP_WRAP_OSD1_MATRIX_EN_CTRL));
78
79 writel_relaxed(1, priv->io_base + _REG(ENCL_VIDEO_EN));
80 }
81
meson_encoder_dsi_atomic_disable(struct drm_bridge * bridge,struct drm_bridge_state * bridge_state)82 static void meson_encoder_dsi_atomic_disable(struct drm_bridge *bridge,
83 struct drm_bridge_state *bridge_state)
84 {
85 struct meson_encoder_dsi *meson_encoder_dsi =
86 bridge_to_meson_encoder_dsi(bridge);
87 struct meson_drm *priv = meson_encoder_dsi->priv;
88
89 writel_relaxed(0, priv->io_base + _REG(ENCL_VIDEO_EN));
90
91 writel_bits_relaxed(BIT(0), BIT(0), priv->io_base + _REG(VPP_WRAP_OSD1_MATRIX_EN_CTRL));
92 }
93
94 static const struct drm_bridge_funcs meson_encoder_dsi_bridge_funcs = {
95 .attach = meson_encoder_dsi_attach,
96 .atomic_enable = meson_encoder_dsi_atomic_enable,
97 .atomic_disable = meson_encoder_dsi_atomic_disable,
98 .atomic_duplicate_state = drm_atomic_helper_bridge_duplicate_state,
99 .atomic_destroy_state = drm_atomic_helper_bridge_destroy_state,
100 .atomic_reset = drm_atomic_helper_bridge_reset,
101 };
102
meson_encoder_dsi_init(struct meson_drm * priv)103 int meson_encoder_dsi_init(struct meson_drm *priv)
104 {
105 struct meson_encoder_dsi *meson_encoder_dsi;
106 struct device_node *remote;
107 int ret;
108
109 meson_encoder_dsi = devm_kzalloc(priv->dev, sizeof(*meson_encoder_dsi), GFP_KERNEL);
110 if (!meson_encoder_dsi)
111 return -ENOMEM;
112
113 /* DSI Transceiver Bridge */
114 remote = of_graph_get_remote_node(priv->dev->of_node, 2, 0);
115 if (!remote) {
116 dev_err(priv->dev, "DSI transceiver device is disabled");
117 return 0;
118 }
119
120 meson_encoder_dsi->next_bridge = of_drm_find_bridge(remote);
121 if (!meson_encoder_dsi->next_bridge) {
122 dev_dbg(priv->dev, "Failed to find DSI transceiver bridge\n");
123 return -EPROBE_DEFER;
124 }
125
126 /* DSI Encoder Bridge */
127 meson_encoder_dsi->bridge.funcs = &meson_encoder_dsi_bridge_funcs;
128 meson_encoder_dsi->bridge.of_node = priv->dev->of_node;
129 meson_encoder_dsi->bridge.type = DRM_MODE_CONNECTOR_DSI;
130
131 drm_bridge_add(&meson_encoder_dsi->bridge);
132
133 meson_encoder_dsi->priv = priv;
134
135 /* Encoder */
136 ret = drm_simple_encoder_init(priv->drm, &meson_encoder_dsi->encoder,
137 DRM_MODE_ENCODER_DSI);
138 if (ret) {
139 dev_err(priv->dev, "Failed to init DSI encoder: %d\n", ret);
140 return ret;
141 }
142
143 meson_encoder_dsi->encoder.possible_crtcs = BIT(0);
144
145 /* Attach DSI Encoder Bridge to Encoder */
146 ret = drm_bridge_attach(&meson_encoder_dsi->encoder, &meson_encoder_dsi->bridge, NULL, 0);
147 if (ret) {
148 dev_err(priv->dev, "Failed to attach bridge: %d\n", ret);
149 return ret;
150 }
151
152 /*
153 * We should have now in place:
154 * encoder->[dsi encoder bridge]->[dw-mipi-dsi bridge]->[panel bridge]->[panel]
155 */
156
157 priv->encoders[MESON_ENC_DSI] = meson_encoder_dsi;
158
159 dev_dbg(priv->dev, "DSI encoder initialized\n");
160
161 return 0;
162 }
163
meson_encoder_dsi_remove(struct meson_drm * priv)164 void meson_encoder_dsi_remove(struct meson_drm *priv)
165 {
166 struct meson_encoder_dsi *meson_encoder_dsi;
167
168 if (priv->encoders[MESON_ENC_DSI]) {
169 meson_encoder_dsi = priv->encoders[MESON_ENC_DSI];
170 drm_bridge_remove(&meson_encoder_dsi->bridge);
171 }
172 }
173