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 * Copyright (C) 2014 Endless Mobile
7 *
8 * Written by:
9 * Jasper St. Pierre <jstpierre@mecheye.net>
10 */
11
12 #include <linux/export.h>
13 #include <linux/of_graph.h>
14
15 #include <drm/drm_atomic_helper.h>
16 #include <drm/drm_bridge.h>
17 #include <drm/drm_bridge_connector.h>
18 #include <drm/drm_device.h>
19 #include <drm/drm_edid.h>
20 #include <drm/drm_probe_helper.h>
21 #include <drm/drm_simple_kms_helper.h>
22
23 #include "meson_registers.h"
24 #include "meson_vclk.h"
25 #include "meson_encoder_cvbs.h"
26
27 /* HHI VDAC Registers */
28 #define HHI_VDAC_CNTL0 0x2F4 /* 0xbd offset in data sheet */
29 #define HHI_VDAC_CNTL0_G12A 0x2EC /* 0xbd offset in data sheet */
30 #define HHI_VDAC_CNTL1 0x2F8 /* 0xbe offset in data sheet */
31 #define HHI_VDAC_CNTL1_G12A 0x2F0 /* 0xbe offset in data sheet */
32
33 struct meson_encoder_cvbs {
34 struct drm_encoder encoder;
35 struct drm_bridge bridge;
36 struct drm_bridge *next_bridge;
37 struct meson_drm *priv;
38 };
39
40 #define bridge_to_meson_encoder_cvbs(x) \
41 container_of(x, struct meson_encoder_cvbs, bridge)
42
43 /* Supported Modes */
44
45 struct meson_cvbs_mode meson_cvbs_modes[MESON_CVBS_MODES_COUNT] = {
46 { /* PAL */
47 .enci = &meson_cvbs_enci_pal,
48 .mode = {
49 DRM_MODE("720x576i", DRM_MODE_TYPE_DRIVER, 13500,
50 720, 732, 795, 864, 0, 576, 580, 586, 625, 0,
51 DRM_MODE_FLAG_INTERLACE),
52 .picture_aspect_ratio = HDMI_PICTURE_ASPECT_4_3,
53 },
54 },
55 { /* NTSC */
56 .enci = &meson_cvbs_enci_ntsc,
57 .mode = {
58 DRM_MODE("720x480i", DRM_MODE_TYPE_DRIVER, 13500,
59 720, 739, 801, 858, 0, 480, 488, 494, 525, 0,
60 DRM_MODE_FLAG_INTERLACE),
61 .picture_aspect_ratio = HDMI_PICTURE_ASPECT_4_3,
62 },
63 },
64 };
65
66 static const struct meson_cvbs_mode *
meson_cvbs_get_mode(const struct drm_display_mode * req_mode)67 meson_cvbs_get_mode(const struct drm_display_mode *req_mode)
68 {
69 int i;
70
71 for (i = 0; i < MESON_CVBS_MODES_COUNT; ++i) {
72 struct meson_cvbs_mode *meson_mode = &meson_cvbs_modes[i];
73
74 if (drm_mode_match(req_mode, &meson_mode->mode,
75 DRM_MODE_MATCH_TIMINGS |
76 DRM_MODE_MATCH_CLOCK |
77 DRM_MODE_MATCH_FLAGS |
78 DRM_MODE_MATCH_3D_FLAGS))
79 return meson_mode;
80 }
81
82 return NULL;
83 }
84
meson_encoder_cvbs_attach(struct drm_bridge * bridge,enum drm_bridge_attach_flags flags)85 static int meson_encoder_cvbs_attach(struct drm_bridge *bridge,
86 enum drm_bridge_attach_flags flags)
87 {
88 struct meson_encoder_cvbs *meson_encoder_cvbs =
89 bridge_to_meson_encoder_cvbs(bridge);
90
91 return drm_bridge_attach(bridge->encoder, meson_encoder_cvbs->next_bridge,
92 &meson_encoder_cvbs->bridge, flags);
93 }
94
meson_encoder_cvbs_get_modes(struct drm_bridge * bridge,struct drm_connector * connector)95 static int meson_encoder_cvbs_get_modes(struct drm_bridge *bridge,
96 struct drm_connector *connector)
97 {
98 struct meson_encoder_cvbs *meson_encoder_cvbs =
99 bridge_to_meson_encoder_cvbs(bridge);
100 struct meson_drm *priv = meson_encoder_cvbs->priv;
101 struct drm_display_mode *mode;
102 int i;
103
104 for (i = 0; i < MESON_CVBS_MODES_COUNT; ++i) {
105 struct meson_cvbs_mode *meson_mode = &meson_cvbs_modes[i];
106
107 mode = drm_mode_duplicate(priv->drm, &meson_mode->mode);
108 if (!mode) {
109 dev_err(priv->dev, "Failed to create a new display mode\n");
110 return 0;
111 }
112
113 drm_mode_probed_add(connector, mode);
114 }
115
116 return i;
117 }
118
119 static enum drm_mode_status
meson_encoder_cvbs_mode_valid(struct drm_bridge * bridge,const struct drm_display_info * display_info,const struct drm_display_mode * mode)120 meson_encoder_cvbs_mode_valid(struct drm_bridge *bridge,
121 const struct drm_display_info *display_info,
122 const struct drm_display_mode *mode)
123 {
124 if (meson_cvbs_get_mode(mode))
125 return MODE_OK;
126
127 return MODE_BAD;
128 }
129
meson_encoder_cvbs_atomic_check(struct drm_bridge * bridge,struct drm_bridge_state * bridge_state,struct drm_crtc_state * crtc_state,struct drm_connector_state * conn_state)130 static int meson_encoder_cvbs_atomic_check(struct drm_bridge *bridge,
131 struct drm_bridge_state *bridge_state,
132 struct drm_crtc_state *crtc_state,
133 struct drm_connector_state *conn_state)
134 {
135 if (meson_cvbs_get_mode(&crtc_state->mode))
136 return 0;
137
138 return -EINVAL;
139 }
140
meson_encoder_cvbs_atomic_enable(struct drm_bridge * bridge,struct drm_bridge_state * bridge_state)141 static void meson_encoder_cvbs_atomic_enable(struct drm_bridge *bridge,
142 struct drm_bridge_state *bridge_state)
143 {
144 struct meson_encoder_cvbs *encoder_cvbs = bridge_to_meson_encoder_cvbs(bridge);
145 struct drm_atomic_state *state = bridge_state->base.state;
146 struct meson_drm *priv = encoder_cvbs->priv;
147 const struct meson_cvbs_mode *meson_mode;
148 struct drm_connector_state *conn_state;
149 struct drm_crtc_state *crtc_state;
150 struct drm_connector *connector;
151
152 connector = drm_atomic_get_new_connector_for_encoder(state, bridge->encoder);
153 if (WARN_ON(!connector))
154 return;
155
156 conn_state = drm_atomic_get_new_connector_state(state, connector);
157 if (WARN_ON(!conn_state))
158 return;
159
160 crtc_state = drm_atomic_get_new_crtc_state(state, conn_state->crtc);
161 if (WARN_ON(!crtc_state))
162 return;
163
164 meson_mode = meson_cvbs_get_mode(&crtc_state->adjusted_mode);
165 if (WARN_ON(!meson_mode))
166 return;
167
168 meson_venci_cvbs_mode_set(priv, meson_mode->enci);
169
170 /* Setup 27MHz vclk2 for ENCI and VDAC */
171 meson_vclk_setup(priv, MESON_VCLK_TARGET_CVBS,
172 MESON_VCLK_CVBS, MESON_VCLK_CVBS,
173 MESON_VCLK_CVBS, MESON_VCLK_CVBS,
174 true);
175
176 /* VDAC0 source is not from ATV */
177 writel_bits_relaxed(VENC_VDAC_SEL_ATV_DMD, 0,
178 priv->io_base + _REG(VENC_VDAC_DACSEL0));
179
180 if (meson_vpu_is_compatible(priv, VPU_COMPATIBLE_GXBB)) {
181 regmap_write(priv->hhi, HHI_VDAC_CNTL0, 1);
182 regmap_write(priv->hhi, HHI_VDAC_CNTL1, 0);
183 } else if (meson_vpu_is_compatible(priv, VPU_COMPATIBLE_GXM) ||
184 meson_vpu_is_compatible(priv, VPU_COMPATIBLE_GXL)) {
185 regmap_write(priv->hhi, HHI_VDAC_CNTL0, 0xf0001);
186 regmap_write(priv->hhi, HHI_VDAC_CNTL1, 0);
187 } else if (meson_vpu_is_compatible(priv, VPU_COMPATIBLE_G12A)) {
188 regmap_write(priv->hhi, HHI_VDAC_CNTL0_G12A, 0x906001);
189 regmap_write(priv->hhi, HHI_VDAC_CNTL1_G12A, 0);
190 }
191 }
192
meson_encoder_cvbs_atomic_disable(struct drm_bridge * bridge,struct drm_bridge_state * bridge_state)193 static void meson_encoder_cvbs_atomic_disable(struct drm_bridge *bridge,
194 struct drm_bridge_state *bridge_state)
195 {
196 struct meson_encoder_cvbs *meson_encoder_cvbs =
197 bridge_to_meson_encoder_cvbs(bridge);
198 struct meson_drm *priv = meson_encoder_cvbs->priv;
199
200 /* Disable CVBS VDAC */
201 if (meson_vpu_is_compatible(priv, VPU_COMPATIBLE_G12A)) {
202 regmap_write(priv->hhi, HHI_VDAC_CNTL0_G12A, 0);
203 regmap_write(priv->hhi, HHI_VDAC_CNTL1_G12A, 0);
204 } else {
205 regmap_write(priv->hhi, HHI_VDAC_CNTL0, 0);
206 regmap_write(priv->hhi, HHI_VDAC_CNTL1, 8);
207 }
208 }
209
210 static const struct drm_bridge_funcs meson_encoder_cvbs_bridge_funcs = {
211 .attach = meson_encoder_cvbs_attach,
212 .mode_valid = meson_encoder_cvbs_mode_valid,
213 .get_modes = meson_encoder_cvbs_get_modes,
214 .atomic_enable = meson_encoder_cvbs_atomic_enable,
215 .atomic_disable = meson_encoder_cvbs_atomic_disable,
216 .atomic_check = meson_encoder_cvbs_atomic_check,
217 .atomic_duplicate_state = drm_atomic_helper_bridge_duplicate_state,
218 .atomic_destroy_state = drm_atomic_helper_bridge_destroy_state,
219 .atomic_reset = drm_atomic_helper_bridge_reset,
220 };
221
meson_encoder_cvbs_probe(struct meson_drm * priv)222 int meson_encoder_cvbs_probe(struct meson_drm *priv)
223 {
224 struct drm_device *drm = priv->drm;
225 struct meson_encoder_cvbs *meson_encoder_cvbs;
226 struct drm_connector *connector;
227 struct device_node *remote;
228 int ret;
229
230 meson_encoder_cvbs = devm_kzalloc(priv->dev, sizeof(*meson_encoder_cvbs), GFP_KERNEL);
231 if (!meson_encoder_cvbs)
232 return -ENOMEM;
233
234 /* CVBS Connector Bridge */
235 remote = of_graph_get_remote_node(priv->dev->of_node, 0, 0);
236 if (!remote) {
237 dev_info(drm->dev, "CVBS Output connector not available\n");
238 return 0;
239 }
240
241 meson_encoder_cvbs->next_bridge = of_drm_find_bridge(remote);
242 of_node_put(remote);
243 if (!meson_encoder_cvbs->next_bridge)
244 return dev_err_probe(priv->dev, -EPROBE_DEFER,
245 "Failed to find CVBS Connector bridge\n");
246
247 /* CVBS Encoder Bridge */
248 meson_encoder_cvbs->bridge.funcs = &meson_encoder_cvbs_bridge_funcs;
249 meson_encoder_cvbs->bridge.of_node = priv->dev->of_node;
250 meson_encoder_cvbs->bridge.type = DRM_MODE_CONNECTOR_Composite;
251 meson_encoder_cvbs->bridge.ops = DRM_BRIDGE_OP_MODES;
252 meson_encoder_cvbs->bridge.interlace_allowed = true;
253
254 drm_bridge_add(&meson_encoder_cvbs->bridge);
255
256 meson_encoder_cvbs->priv = priv;
257
258 /* Encoder */
259 ret = drm_simple_encoder_init(priv->drm, &meson_encoder_cvbs->encoder,
260 DRM_MODE_ENCODER_TVDAC);
261 if (ret)
262 return dev_err_probe(priv->dev, ret,
263 "Failed to init CVBS encoder\n");
264
265 meson_encoder_cvbs->encoder.possible_crtcs = BIT(0);
266
267 /* Attach CVBS Encoder Bridge to Encoder */
268 ret = drm_bridge_attach(&meson_encoder_cvbs->encoder, &meson_encoder_cvbs->bridge, NULL,
269 DRM_BRIDGE_ATTACH_NO_CONNECTOR);
270 if (ret) {
271 dev_err(priv->dev, "Failed to attach bridge: %d\n", ret);
272 return ret;
273 }
274
275 /* Initialize & attach Bridge Connector */
276 connector = drm_bridge_connector_init(priv->drm, &meson_encoder_cvbs->encoder);
277 if (IS_ERR(connector))
278 return dev_err_probe(priv->dev, PTR_ERR(connector),
279 "Unable to create CVBS bridge connector\n");
280
281 drm_connector_attach_encoder(connector, &meson_encoder_cvbs->encoder);
282
283 priv->encoders[MESON_ENC_CVBS] = meson_encoder_cvbs;
284
285 return 0;
286 }
287
meson_encoder_cvbs_remove(struct meson_drm * priv)288 void meson_encoder_cvbs_remove(struct meson_drm *priv)
289 {
290 struct meson_encoder_cvbs *meson_encoder_cvbs;
291
292 if (priv->encoders[MESON_ENC_CVBS]) {
293 meson_encoder_cvbs = priv->encoders[MESON_ENC_CVBS];
294 drm_bridge_remove(&meson_encoder_cvbs->bridge);
295 }
296 }
297