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,struct drm_encoder * encoder,enum drm_bridge_attach_flags flags)35 static int meson_encoder_dsi_attach(struct drm_bridge *bridge,
36 struct drm_encoder *encoder,
37 enum drm_bridge_attach_flags flags)
38 {
39 struct meson_encoder_dsi *encoder_dsi = bridge_to_meson_encoder_dsi(bridge);
40
41 return drm_bridge_attach(encoder, encoder_dsi->next_bridge,
42 &encoder_dsi->bridge, flags);
43 }
44
meson_encoder_dsi_atomic_enable(struct drm_bridge * bridge,struct drm_atomic_state * state)45 static void meson_encoder_dsi_atomic_enable(struct drm_bridge *bridge,
46 struct drm_atomic_state *state)
47 {
48 struct meson_encoder_dsi *encoder_dsi = bridge_to_meson_encoder_dsi(bridge);
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_atomic_state * state)82 static void meson_encoder_dsi_atomic_disable(struct drm_bridge *bridge,
83 struct drm_atomic_state *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_probe(struct meson_drm * priv)103 int meson_encoder_dsi_probe(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_drm_bridge_alloc(priv->dev,
110 struct meson_encoder_dsi,
111 bridge,
112 &meson_encoder_dsi_bridge_funcs);
113 if (IS_ERR(meson_encoder_dsi))
114 return PTR_ERR(meson_encoder_dsi);
115
116 /* DSI Transceiver Bridge */
117 remote = of_graph_get_remote_node(priv->dev->of_node, 2, 0);
118 if (!remote) {
119 dev_err(priv->dev, "DSI transceiver device is disabled");
120 return 0;
121 }
122
123 meson_encoder_dsi->next_bridge = of_drm_find_bridge(remote);
124 if (!meson_encoder_dsi->next_bridge)
125 return dev_err_probe(priv->dev, -EPROBE_DEFER,
126 "Failed to find DSI transceiver bridge\n");
127
128 /* DSI Encoder Bridge */
129 meson_encoder_dsi->bridge.of_node = priv->dev->of_node;
130 meson_encoder_dsi->bridge.type = DRM_MODE_CONNECTOR_DSI;
131
132 drm_bridge_add(&meson_encoder_dsi->bridge);
133
134 meson_encoder_dsi->priv = priv;
135
136 /* Encoder */
137 ret = drm_simple_encoder_init(priv->drm, &meson_encoder_dsi->encoder,
138 DRM_MODE_ENCODER_DSI);
139 if (ret)
140 return dev_err_probe(priv->dev, ret,
141 "Failed to init DSI encoder\n");
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 return dev_err_probe(priv->dev, ret,
149 "Failed to attach bridge\n");
150
151 /*
152 * We should have now in place:
153 * encoder->[dsi encoder bridge]->[dw-mipi-dsi bridge]->[panel bridge]->[panel]
154 */
155
156 priv->encoders[MESON_ENC_DSI] = meson_encoder_dsi;
157
158 dev_dbg(priv->dev, "DSI encoder initialized\n");
159
160 return 0;
161 }
162
meson_encoder_dsi_remove(struct meson_drm * priv)163 void meson_encoder_dsi_remove(struct meson_drm *priv)
164 {
165 struct meson_encoder_dsi *meson_encoder_dsi;
166
167 if (priv->encoders[MESON_ENC_DSI]) {
168 meson_encoder_dsi = priv->encoders[MESON_ENC_DSI];
169 drm_bridge_remove(&meson_encoder_dsi->bridge);
170 }
171 }
172