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 *
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 
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 
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
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 
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 
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 
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 
222 int meson_encoder_cvbs_init(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 		dev_err(priv->dev, "Failed to find CVBS Connector bridge\n");
245 		return -EPROBE_DEFER;
246 	}
247 
248 	/* CVBS Encoder Bridge */
249 	meson_encoder_cvbs->bridge.funcs = &meson_encoder_cvbs_bridge_funcs;
250 	meson_encoder_cvbs->bridge.of_node = priv->dev->of_node;
251 	meson_encoder_cvbs->bridge.type = DRM_MODE_CONNECTOR_Composite;
252 	meson_encoder_cvbs->bridge.ops = DRM_BRIDGE_OP_MODES;
253 	meson_encoder_cvbs->bridge.interlace_allowed = true;
254 
255 	drm_bridge_add(&meson_encoder_cvbs->bridge);
256 
257 	meson_encoder_cvbs->priv = priv;
258 
259 	/* Encoder */
260 	ret = drm_simple_encoder_init(priv->drm, &meson_encoder_cvbs->encoder,
261 				      DRM_MODE_ENCODER_TVDAC);
262 	if (ret) {
263 		dev_err(priv->dev, "Failed to init CVBS encoder: %d\n", ret);
264 		return ret;
265 	}
266 
267 	meson_encoder_cvbs->encoder.possible_crtcs = BIT(0);
268 
269 	/* Attach CVBS Encoder Bridge to Encoder */
270 	ret = drm_bridge_attach(&meson_encoder_cvbs->encoder, &meson_encoder_cvbs->bridge, NULL,
271 				DRM_BRIDGE_ATTACH_NO_CONNECTOR);
272 	if (ret) {
273 		dev_err(priv->dev, "Failed to attach bridge: %d\n", ret);
274 		return ret;
275 	}
276 
277 	/* Initialize & attach Bridge Connector */
278 	connector = drm_bridge_connector_init(priv->drm, &meson_encoder_cvbs->encoder);
279 	if (IS_ERR(connector)) {
280 		dev_err(priv->dev, "Unable to create CVBS bridge connector\n");
281 		return PTR_ERR(connector);
282 	}
283 	drm_connector_attach_encoder(connector, &meson_encoder_cvbs->encoder);
284 
285 	priv->encoders[MESON_ENC_CVBS] = meson_encoder_cvbs;
286 
287 	return 0;
288 }
289 
290 void meson_encoder_cvbs_remove(struct meson_drm *priv)
291 {
292 	struct meson_encoder_cvbs *meson_encoder_cvbs;
293 
294 	if (priv->encoders[MESON_ENC_CVBS]) {
295 		meson_encoder_cvbs = priv->encoders[MESON_ENC_CVBS];
296 		drm_bridge_remove(&meson_encoder_cvbs->bridge);
297 	}
298 }
299