Commit | Line | Data |
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14b6873a AH |
1 | /* |
2 | * Exynos DRM Parallel output support. | |
3 | * | |
4 | * Copyright (c) 2014 Samsung Electronics Co., Ltd | |
5 | * | |
6 | * Contacts: Andrzej Hajda <a.hajda@samsung.com> | |
7 | * | |
8 | * This program is free software; you can redistribute it and/or modify | |
9 | * it under the terms of the GNU General Public License version 2 as | |
10 | * published by the Free Software Foundation. | |
11 | */ | |
12 | ||
13 | #include <drm/drmP.h> | |
14 | #include <drm/drm_crtc_helper.h> | |
15 | #include <drm/drm_panel.h> | |
4ea9526b | 16 | #include <drm/drm_atomic_helper.h> |
14b6873a AH |
17 | |
18 | #include <linux/regulator/consumer.h> | |
19 | ||
20 | #include <video/of_videomode.h> | |
21 | #include <video/videomode.h> | |
22 | ||
23 | #include "exynos_drm_drv.h" | |
24 | ||
25 | struct exynos_dpi { | |
4cfde1f2 | 26 | struct exynos_drm_display display; |
14b6873a AH |
27 | struct device *dev; |
28 | struct device_node *panel_node; | |
29 | ||
30 | struct drm_panel *panel; | |
31 | struct drm_connector connector; | |
32 | struct drm_encoder *encoder; | |
33 | ||
34 | struct videomode *vm; | |
14b6873a AH |
35 | }; |
36 | ||
37 | #define connector_to_dpi(c) container_of(c, struct exynos_dpi, connector) | |
38 | ||
4cfde1f2 AH |
39 | static inline struct exynos_dpi *display_to_dpi(struct exynos_drm_display *d) |
40 | { | |
41 | return container_of(d, struct exynos_dpi, display); | |
42 | } | |
43 | ||
14b6873a AH |
44 | static enum drm_connector_status |
45 | exynos_dpi_detect(struct drm_connector *connector, bool force) | |
46 | { | |
47 | struct exynos_dpi *ctx = connector_to_dpi(connector); | |
48 | ||
aaa51b13 | 49 | if (ctx->panel && !ctx->panel->connector) |
000cc920 | 50 | drm_panel_attach(ctx->panel, &ctx->connector); |
14b6873a | 51 | |
000cc920 | 52 | return connector_status_connected; |
14b6873a AH |
53 | } |
54 | ||
55 | static void exynos_dpi_connector_destroy(struct drm_connector *connector) | |
56 | { | |
34ea3d38 | 57 | drm_connector_unregister(connector); |
14b6873a AH |
58 | drm_connector_cleanup(connector); |
59 | } | |
60 | ||
61 | static struct drm_connector_funcs exynos_dpi_connector_funcs = { | |
63498e30 | 62 | .dpms = drm_atomic_helper_connector_dpms, |
14b6873a AH |
63 | .detect = exynos_dpi_detect, |
64 | .fill_modes = drm_helper_probe_single_connector_modes, | |
65 | .destroy = exynos_dpi_connector_destroy, | |
4ea9526b GP |
66 | .reset = drm_atomic_helper_connector_reset, |
67 | .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state, | |
68 | .atomic_destroy_state = drm_atomic_helper_connector_destroy_state, | |
14b6873a AH |
69 | }; |
70 | ||
71 | static int exynos_dpi_get_modes(struct drm_connector *connector) | |
72 | { | |
73 | struct exynos_dpi *ctx = connector_to_dpi(connector); | |
74 | ||
75 | /* fimd timings gets precedence over panel modes */ | |
76 | if (ctx->vm) { | |
77 | struct drm_display_mode *mode; | |
78 | ||
79 | mode = drm_mode_create(connector->dev); | |
80 | if (!mode) { | |
81 | DRM_ERROR("failed to create a new display mode\n"); | |
82 | return 0; | |
83 | } | |
84 | drm_display_mode_from_videomode(ctx->vm, mode); | |
85 | mode->type = DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED; | |
86 | drm_mode_probed_add(connector, mode); | |
87 | return 1; | |
88 | } | |
89 | ||
90 | if (ctx->panel) | |
91 | return ctx->panel->funcs->get_modes(ctx->panel); | |
92 | ||
93 | return 0; | |
94 | } | |
95 | ||
14b6873a AH |
96 | static struct drm_encoder * |
97 | exynos_dpi_best_encoder(struct drm_connector *connector) | |
98 | { | |
99 | struct exynos_dpi *ctx = connector_to_dpi(connector); | |
100 | ||
101 | return ctx->encoder; | |
102 | } | |
103 | ||
104 | static struct drm_connector_helper_funcs exynos_dpi_connector_helper_funcs = { | |
105 | .get_modes = exynos_dpi_get_modes, | |
14b6873a AH |
106 | .best_encoder = exynos_dpi_best_encoder, |
107 | }; | |
108 | ||
109 | static int exynos_dpi_create_connector(struct exynos_drm_display *display, | |
110 | struct drm_encoder *encoder) | |
111 | { | |
5af3d9bb | 112 | struct exynos_dpi *ctx = display_to_dpi(display); |
14b6873a AH |
113 | struct drm_connector *connector = &ctx->connector; |
114 | int ret; | |
115 | ||
116 | ctx->encoder = encoder; | |
117 | ||
ae08fe6c | 118 | connector->polled = DRM_CONNECTOR_POLL_HPD; |
14b6873a AH |
119 | |
120 | ret = drm_connector_init(encoder->dev, connector, | |
121 | &exynos_dpi_connector_funcs, | |
122 | DRM_MODE_CONNECTOR_VGA); | |
123 | if (ret) { | |
124 | DRM_ERROR("failed to initialize connector with drm\n"); | |
125 | return ret; | |
126 | } | |
127 | ||
128 | drm_connector_helper_add(connector, &exynos_dpi_connector_helper_funcs); | |
34ea3d38 | 129 | drm_connector_register(connector); |
14b6873a AH |
130 | drm_mode_connector_attach_encoder(connector, encoder); |
131 | ||
132 | return 0; | |
133 | } | |
134 | ||
b6595dc7 | 135 | static void exynos_dpi_enable(struct exynos_drm_display *display) |
14b6873a | 136 | { |
b6595dc7 GP |
137 | struct exynos_dpi *ctx = display_to_dpi(display); |
138 | ||
39bbde9c AK |
139 | if (ctx->panel) { |
140 | drm_panel_prepare(ctx->panel); | |
14b6873a | 141 | drm_panel_enable(ctx->panel); |
39bbde9c | 142 | } |
14b6873a AH |
143 | } |
144 | ||
b6595dc7 | 145 | static void exynos_dpi_disable(struct exynos_drm_display *display) |
14b6873a | 146 | { |
b6595dc7 GP |
147 | struct exynos_dpi *ctx = display_to_dpi(display); |
148 | ||
39bbde9c | 149 | if (ctx->panel) { |
14b6873a | 150 | drm_panel_disable(ctx->panel); |
39bbde9c AK |
151 | drm_panel_unprepare(ctx->panel); |
152 | } | |
14b6873a AH |
153 | } |
154 | ||
14b6873a AH |
155 | static struct exynos_drm_display_ops exynos_dpi_display_ops = { |
156 | .create_connector = exynos_dpi_create_connector, | |
b6595dc7 GP |
157 | .enable = exynos_dpi_enable, |
158 | .disable = exynos_dpi_disable, | |
14b6873a AH |
159 | }; |
160 | ||
14b6873a AH |
161 | /* of_* functions will be removed after merge of of_graph patches */ |
162 | static struct device_node * | |
163 | of_get_child_by_name_reg(struct device_node *parent, const char *name, u32 reg) | |
164 | { | |
165 | struct device_node *np; | |
166 | ||
167 | for_each_child_of_node(parent, np) { | |
168 | u32 r; | |
169 | ||
170 | if (!np->name || of_node_cmp(np->name, name)) | |
171 | continue; | |
172 | ||
173 | if (of_property_read_u32(np, "reg", &r) < 0) | |
174 | r = 0; | |
175 | ||
176 | if (reg == r) | |
177 | break; | |
178 | } | |
179 | ||
180 | return np; | |
181 | } | |
182 | ||
183 | static struct device_node *of_graph_get_port_by_reg(struct device_node *parent, | |
184 | u32 reg) | |
185 | { | |
186 | struct device_node *ports, *port; | |
187 | ||
188 | ports = of_get_child_by_name(parent, "ports"); | |
189 | if (ports) | |
190 | parent = ports; | |
191 | ||
192 | port = of_get_child_by_name_reg(parent, "port", reg); | |
193 | ||
194 | of_node_put(ports); | |
195 | ||
196 | return port; | |
197 | } | |
198 | ||
199 | static struct device_node * | |
200 | of_graph_get_endpoint_by_reg(struct device_node *port, u32 reg) | |
201 | { | |
202 | return of_get_child_by_name_reg(port, "endpoint", reg); | |
203 | } | |
204 | ||
205 | static struct device_node * | |
206 | of_graph_get_remote_port_parent(const struct device_node *node) | |
207 | { | |
208 | struct device_node *np; | |
209 | unsigned int depth; | |
210 | ||
211 | np = of_parse_phandle(node, "remote-endpoint", 0); | |
212 | ||
213 | /* Walk 3 levels up only if there is 'ports' node. */ | |
214 | for (depth = 3; depth && np; depth--) { | |
215 | np = of_get_next_parent(np); | |
216 | if (depth == 2 && of_node_cmp(np->name, "ports")) | |
217 | break; | |
218 | } | |
219 | return np; | |
220 | } | |
221 | ||
222 | enum { | |
223 | FIMD_PORT_IN0, | |
224 | FIMD_PORT_IN1, | |
225 | FIMD_PORT_IN2, | |
226 | FIMD_PORT_RGB, | |
227 | FIMD_PORT_WRB, | |
228 | }; | |
229 | ||
f46ed1ab | 230 | static struct device_node *exynos_dpi_of_find_panel_node(struct device *dev) |
14b6873a AH |
231 | { |
232 | struct device_node *np, *ep; | |
233 | ||
234 | np = of_graph_get_port_by_reg(dev->of_node, FIMD_PORT_RGB); | |
235 | if (!np) | |
236 | return NULL; | |
237 | ||
238 | ep = of_graph_get_endpoint_by_reg(np, 0); | |
239 | of_node_put(np); | |
240 | if (!ep) | |
241 | return NULL; | |
242 | ||
243 | np = of_graph_get_remote_port_parent(ep); | |
244 | of_node_put(ep); | |
245 | ||
246 | return np; | |
247 | } | |
248 | ||
249 | static int exynos_dpi_parse_dt(struct exynos_dpi *ctx) | |
250 | { | |
251 | struct device *dev = ctx->dev; | |
252 | struct device_node *dn = dev->of_node; | |
253 | struct device_node *np; | |
254 | ||
255 | ctx->panel_node = exynos_dpi_of_find_panel_node(dev); | |
256 | ||
257 | np = of_get_child_by_name(dn, "display-timings"); | |
258 | if (np) { | |
259 | struct videomode *vm; | |
260 | int ret; | |
261 | ||
262 | of_node_put(np); | |
263 | ||
264 | vm = devm_kzalloc(dev, sizeof(*ctx->vm), GFP_KERNEL); | |
265 | if (!vm) | |
266 | return -ENOMEM; | |
267 | ||
268 | ret = of_get_videomode(dn, vm, 0); | |
000cc920 AH |
269 | if (ret < 0) { |
270 | devm_kfree(dev, vm); | |
14b6873a | 271 | return ret; |
000cc920 | 272 | } |
14b6873a AH |
273 | |
274 | ctx->vm = vm; | |
275 | ||
276 | return 0; | |
277 | } | |
278 | ||
279 | if (!ctx->panel_node) | |
280 | return -EINVAL; | |
281 | ||
282 | return 0; | |
283 | } | |
284 | ||
000cc920 | 285 | struct exynos_drm_display *exynos_dpi_probe(struct device *dev) |
14b6873a AH |
286 | { |
287 | struct exynos_dpi *ctx; | |
288 | int ret; | |
289 | ||
290 | ctx = devm_kzalloc(dev, sizeof(*ctx), GFP_KERNEL); | |
291 | if (!ctx) | |
4cfde1f2 | 292 | return ERR_PTR(-ENOMEM); |
14b6873a | 293 | |
4cfde1f2 AH |
294 | ctx->display.type = EXYNOS_DISPLAY_TYPE_LCD; |
295 | ctx->display.ops = &exynos_dpi_display_ops; | |
14b6873a | 296 | ctx->dev = dev; |
14b6873a AH |
297 | |
298 | ret = exynos_dpi_parse_dt(ctx); | |
000cc920 AH |
299 | if (ret < 0) { |
300 | devm_kfree(dev, ctx); | |
86650408 | 301 | return NULL; |
000cc920 AH |
302 | } |
303 | ||
304 | if (ctx->panel_node) { | |
305 | ctx->panel = of_drm_find_panel(ctx->panel_node); | |
86650408 | 306 | if (!ctx->panel) |
000cc920 AH |
307 | return ERR_PTR(-EPROBE_DEFER); |
308 | } | |
14b6873a | 309 | |
4cfde1f2 | 310 | return &ctx->display; |
14b6873a AH |
311 | } |
312 | ||
4cfde1f2 | 313 | int exynos_dpi_remove(struct exynos_drm_display *display) |
14b6873a | 314 | { |
4cfde1f2 | 315 | struct exynos_dpi *ctx = display_to_dpi(display); |
f37cd5e8 | 316 | |
b6595dc7 | 317 | exynos_dpi_disable(&ctx->display); |
90eac897 | 318 | |
90eac897 AH |
319 | if (ctx->panel) |
320 | drm_panel_detach(ctx->panel); | |
14b6873a AH |
321 | |
322 | return 0; | |
323 | } |