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
meson_encoder_cvbs_mode_valid(struct drm_bridge * bridge,const struct drm_display_info * display_info,const struct drm_display_mode * mode)119 static int meson_encoder_cvbs_mode_valid(struct drm_bridge *bridge,
120 const struct drm_display_info *display_info,
121 const struct drm_display_mode *mode)
122 {
123 if (meson_cvbs_get_mode(mode))
124 return MODE_OK;
125
126 return MODE_BAD;
127 }
128
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)129 static int meson_encoder_cvbs_atomic_check(struct drm_bridge *bridge,
130 struct drm_bridge_state *bridge_state,
131 struct drm_crtc_state *crtc_state,
132 struct drm_connector_state *conn_state)
133 {
134 if (meson_cvbs_get_mode(&crtc_state->mode))
135 return 0;
136
137 return -EINVAL;
138 }
139
meson_encoder_cvbs_atomic_enable(struct drm_bridge * bridge,struct drm_bridge_state * bridge_state)140 static void meson_encoder_cvbs_atomic_enable(struct drm_bridge *bridge,
141 struct drm_bridge_state *bridge_state)
142 {
143 struct meson_encoder_cvbs *encoder_cvbs = bridge_to_meson_encoder_cvbs(bridge);
144 struct drm_atomic_state *state = bridge_state->base.state;
145 struct meson_drm *priv = encoder_cvbs->priv;
146 const struct meson_cvbs_mode *meson_mode;
147 struct drm_connector_state *conn_state;
148 struct drm_crtc_state *crtc_state;
149 struct drm_connector *connector;
150
151 connector = drm_atomic_get_new_connector_for_encoder(state, bridge->encoder);
152 if (WARN_ON(!connector))
153 return;
154
155 conn_state = drm_atomic_get_new_connector_state(state, connector);
156 if (WARN_ON(!conn_state))
157 return;
158
159 crtc_state = drm_atomic_get_new_crtc_state(state, conn_state->crtc);
160 if (WARN_ON(!crtc_state))
161 return;
162
163 meson_mode = meson_cvbs_get_mode(&crtc_state->adjusted_mode);
164 if (WARN_ON(!meson_mode))
165 return;
166
167 meson_venci_cvbs_mode_set(priv, meson_mode->enci);
168
169 /* Setup 27MHz vclk2 for ENCI and VDAC */
170 meson_vclk_setup(priv, MESON_VCLK_TARGET_CVBS,
171 MESON_VCLK_CVBS, MESON_VCLK_CVBS,
172 MESON_VCLK_CVBS, MESON_VCLK_CVBS,
173 true);
174
175 /* VDAC0 source is not from ATV */
176 writel_bits_relaxed(VENC_VDAC_SEL_ATV_DMD, 0,
177 priv->io_base + _REG(VENC_VDAC_DACSEL0));
178
179 if (meson_vpu_is_compatible(priv, VPU_COMPATIBLE_GXBB)) {
180 regmap_write(priv->hhi, HHI_VDAC_CNTL0, 1);
181 regmap_write(priv->hhi, HHI_VDAC_CNTL1, 0);
182 } else if (meson_vpu_is_compatible(priv, VPU_COMPATIBLE_GXM) ||
183 meson_vpu_is_compatible(priv, VPU_COMPATIBLE_GXL)) {
184 regmap_write(priv->hhi, HHI_VDAC_CNTL0, 0xf0001);
185 regmap_write(priv->hhi, HHI_VDAC_CNTL1, 0);
186 } else if (meson_vpu_is_compatible(priv, VPU_COMPATIBLE_G12A)) {
187 regmap_write(priv->hhi, HHI_VDAC_CNTL0_G12A, 0x906001);
188 regmap_write(priv->hhi, HHI_VDAC_CNTL1_G12A, 0);
189 }
190 }
191
meson_encoder_cvbs_atomic_disable(struct drm_bridge * bridge,struct drm_bridge_state * bridge_state)192 static void meson_encoder_cvbs_atomic_disable(struct drm_bridge *bridge,
193 struct drm_bridge_state *bridge_state)
194 {
195 struct meson_encoder_cvbs *meson_encoder_cvbs =
196 bridge_to_meson_encoder_cvbs(bridge);
197 struct meson_drm *priv = meson_encoder_cvbs->priv;
198
199 /* Disable CVBS VDAC */
200 if (meson_vpu_is_compatible(priv, VPU_COMPATIBLE_G12A)) {
201 regmap_write(priv->hhi, HHI_VDAC_CNTL0_G12A, 0);
202 regmap_write(priv->hhi, HHI_VDAC_CNTL1_G12A, 0);
203 } else {
204 regmap_write(priv->hhi, HHI_VDAC_CNTL0, 0);
205 regmap_write(priv->hhi, HHI_VDAC_CNTL1, 8);
206 }
207 }
208
209 static const struct drm_bridge_funcs meson_encoder_cvbs_bridge_funcs = {
210 .attach = meson_encoder_cvbs_attach,
211 .mode_valid = meson_encoder_cvbs_mode_valid,
212 .get_modes = meson_encoder_cvbs_get_modes,
213 .atomic_enable = meson_encoder_cvbs_atomic_enable,
214 .atomic_disable = meson_encoder_cvbs_atomic_disable,
215 .atomic_check = meson_encoder_cvbs_atomic_check,
216 .atomic_duplicate_state = drm_atomic_helper_bridge_duplicate_state,
217 .atomic_destroy_state = drm_atomic_helper_bridge_destroy_state,
218 .atomic_reset = drm_atomic_helper_bridge_reset,
219 };
220
meson_encoder_cvbs_init(struct meson_drm * priv)221 int meson_encoder_cvbs_init(struct meson_drm *priv)
222 {
223 struct drm_device *drm = priv->drm;
224 struct meson_encoder_cvbs *meson_encoder_cvbs;
225 struct drm_connector *connector;
226 struct device_node *remote;
227 int ret;
228
229 meson_encoder_cvbs = devm_kzalloc(priv->dev, sizeof(*meson_encoder_cvbs), GFP_KERNEL);
230 if (!meson_encoder_cvbs)
231 return -ENOMEM;
232
233 /* CVBS Connector Bridge */
234 remote = of_graph_get_remote_node(priv->dev->of_node, 0, 0);
235 if (!remote) {
236 dev_info(drm->dev, "CVBS Output connector not available\n");
237 return 0;
238 }
239
240 meson_encoder_cvbs->next_bridge = of_drm_find_bridge(remote);
241 of_node_put(remote);
242 if (!meson_encoder_cvbs->next_bridge) {
243 dev_err(priv->dev, "Failed to find CVBS Connector bridge\n");
244 return -EPROBE_DEFER;
245 }
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 dev_err(priv->dev, "Failed to init CVBS encoder: %d\n", ret);
263 return ret;
264 }
265
266 meson_encoder_cvbs->encoder.possible_crtcs = BIT(0);
267
268 /* Attach CVBS Encoder Bridge to Encoder */
269 ret = drm_bridge_attach(&meson_encoder_cvbs->encoder, &meson_encoder_cvbs->bridge, NULL,
270 DRM_BRIDGE_ATTACH_NO_CONNECTOR);
271 if (ret) {
272 dev_err(priv->dev, "Failed to attach bridge: %d\n", ret);
273 return ret;
274 }
275
276 /* Initialize & attach Bridge Connector */
277 connector = drm_bridge_connector_init(priv->drm, &meson_encoder_cvbs->encoder);
278 if (IS_ERR(connector)) {
279 dev_err(priv->dev, "Unable to create CVBS bridge connector\n");
280 return PTR_ERR(connector);
281 }
282 drm_connector_attach_encoder(connector, &meson_encoder_cvbs->encoder);
283
284 priv->encoders[MESON_ENC_CVBS] = meson_encoder_cvbs;
285
286 return 0;
287 }
288
meson_encoder_cvbs_remove(struct meson_drm * priv)289 void meson_encoder_cvbs_remove(struct meson_drm *priv)
290 {
291 struct meson_encoder_cvbs *meson_encoder_cvbs;
292
293 if (priv->encoders[MESON_ENC_CVBS]) {
294 meson_encoder_cvbs = priv->encoders[MESON_ENC_CVBS];
295 drm_bridge_remove(&meson_encoder_cvbs->bridge);
296 drm_bridge_remove(meson_encoder_cvbs->next_bridge);
297 }
298 }
299
