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> | |
16 | ||
17 | #include <linux/regulator/consumer.h> | |
18 | ||
19 | #include <video/of_videomode.h> | |
20 | #include <video/videomode.h> | |
21 | ||
22 | #include "exynos_drm_drv.h" | |
23 | ||
24 | struct exynos_dpi { | |
25 | struct device *dev; | |
26 | struct device_node *panel_node; | |
27 | ||
28 | struct drm_panel *panel; | |
29 | struct drm_connector connector; | |
30 | struct drm_encoder *encoder; | |
31 | ||
32 | struct videomode *vm; | |
33 | int dpms_mode; | |
34 | }; | |
35 | ||
36 | #define connector_to_dpi(c) container_of(c, struct exynos_dpi, connector) | |
37 | ||
38 | static enum drm_connector_status | |
39 | exynos_dpi_detect(struct drm_connector *connector, bool force) | |
40 | { | |
41 | struct exynos_dpi *ctx = connector_to_dpi(connector); | |
42 | ||
aaa51b13 | 43 | if (ctx->panel && !ctx->panel->connector) |
000cc920 | 44 | drm_panel_attach(ctx->panel, &ctx->connector); |
14b6873a | 45 | |
000cc920 | 46 | return connector_status_connected; |
14b6873a AH |
47 | } |
48 | ||
49 | static void exynos_dpi_connector_destroy(struct drm_connector *connector) | |
50 | { | |
51 | drm_sysfs_connector_remove(connector); | |
52 | drm_connector_cleanup(connector); | |
53 | } | |
54 | ||
55 | static struct drm_connector_funcs exynos_dpi_connector_funcs = { | |
56 | .dpms = drm_helper_connector_dpms, | |
57 | .detect = exynos_dpi_detect, | |
58 | .fill_modes = drm_helper_probe_single_connector_modes, | |
59 | .destroy = exynos_dpi_connector_destroy, | |
60 | }; | |
61 | ||
62 | static int exynos_dpi_get_modes(struct drm_connector *connector) | |
63 | { | |
64 | struct exynos_dpi *ctx = connector_to_dpi(connector); | |
65 | ||
66 | /* fimd timings gets precedence over panel modes */ | |
67 | if (ctx->vm) { | |
68 | struct drm_display_mode *mode; | |
69 | ||
70 | mode = drm_mode_create(connector->dev); | |
71 | if (!mode) { | |
72 | DRM_ERROR("failed to create a new display mode\n"); | |
73 | return 0; | |
74 | } | |
75 | drm_display_mode_from_videomode(ctx->vm, mode); | |
76 | mode->type = DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED; | |
77 | drm_mode_probed_add(connector, mode); | |
78 | return 1; | |
79 | } | |
80 | ||
81 | if (ctx->panel) | |
82 | return ctx->panel->funcs->get_modes(ctx->panel); | |
83 | ||
84 | return 0; | |
85 | } | |
86 | ||
14b6873a AH |
87 | static struct drm_encoder * |
88 | exynos_dpi_best_encoder(struct drm_connector *connector) | |
89 | { | |
90 | struct exynos_dpi *ctx = connector_to_dpi(connector); | |
91 | ||
92 | return ctx->encoder; | |
93 | } | |
94 | ||
95 | static struct drm_connector_helper_funcs exynos_dpi_connector_helper_funcs = { | |
96 | .get_modes = exynos_dpi_get_modes, | |
14b6873a AH |
97 | .best_encoder = exynos_dpi_best_encoder, |
98 | }; | |
99 | ||
100 | static int exynos_dpi_create_connector(struct exynos_drm_display *display, | |
101 | struct drm_encoder *encoder) | |
102 | { | |
103 | struct exynos_dpi *ctx = display->ctx; | |
104 | struct drm_connector *connector = &ctx->connector; | |
105 | int ret; | |
106 | ||
107 | ctx->encoder = encoder; | |
108 | ||
ae08fe6c | 109 | connector->polled = DRM_CONNECTOR_POLL_HPD; |
14b6873a AH |
110 | |
111 | ret = drm_connector_init(encoder->dev, connector, | |
112 | &exynos_dpi_connector_funcs, | |
113 | DRM_MODE_CONNECTOR_VGA); | |
114 | if (ret) { | |
115 | DRM_ERROR("failed to initialize connector with drm\n"); | |
116 | return ret; | |
117 | } | |
118 | ||
119 | drm_connector_helper_add(connector, &exynos_dpi_connector_helper_funcs); | |
120 | drm_sysfs_connector_add(connector); | |
121 | drm_mode_connector_attach_encoder(connector, encoder); | |
122 | ||
123 | return 0; | |
124 | } | |
125 | ||
126 | static void exynos_dpi_poweron(struct exynos_dpi *ctx) | |
127 | { | |
128 | if (ctx->panel) | |
129 | drm_panel_enable(ctx->panel); | |
130 | } | |
131 | ||
132 | static void exynos_dpi_poweroff(struct exynos_dpi *ctx) | |
133 | { | |
134 | if (ctx->panel) | |
135 | drm_panel_disable(ctx->panel); | |
136 | } | |
137 | ||
138 | static void exynos_dpi_dpms(struct exynos_drm_display *display, int mode) | |
139 | { | |
140 | struct exynos_dpi *ctx = display->ctx; | |
141 | ||
142 | switch (mode) { | |
143 | case DRM_MODE_DPMS_ON: | |
144 | if (ctx->dpms_mode != DRM_MODE_DPMS_ON) | |
145 | exynos_dpi_poweron(ctx); | |
146 | break; | |
147 | case DRM_MODE_DPMS_STANDBY: | |
148 | case DRM_MODE_DPMS_SUSPEND: | |
149 | case DRM_MODE_DPMS_OFF: | |
150 | if (ctx->dpms_mode == DRM_MODE_DPMS_ON) | |
151 | exynos_dpi_poweroff(ctx); | |
152 | break; | |
153 | default: | |
154 | break; | |
10d9b4ed | 155 | } |
14b6873a AH |
156 | ctx->dpms_mode = mode; |
157 | } | |
158 | ||
159 | static struct exynos_drm_display_ops exynos_dpi_display_ops = { | |
160 | .create_connector = exynos_dpi_create_connector, | |
161 | .dpms = exynos_dpi_dpms | |
162 | }; | |
163 | ||
164 | static struct exynos_drm_display exynos_dpi_display = { | |
165 | .type = EXYNOS_DISPLAY_TYPE_LCD, | |
166 | .ops = &exynos_dpi_display_ops, | |
167 | }; | |
168 | ||
169 | /* of_* functions will be removed after merge of of_graph patches */ | |
170 | static struct device_node * | |
171 | of_get_child_by_name_reg(struct device_node *parent, const char *name, u32 reg) | |
172 | { | |
173 | struct device_node *np; | |
174 | ||
175 | for_each_child_of_node(parent, np) { | |
176 | u32 r; | |
177 | ||
178 | if (!np->name || of_node_cmp(np->name, name)) | |
179 | continue; | |
180 | ||
181 | if (of_property_read_u32(np, "reg", &r) < 0) | |
182 | r = 0; | |
183 | ||
184 | if (reg == r) | |
185 | break; | |
186 | } | |
187 | ||
188 | return np; | |
189 | } | |
190 | ||
191 | static struct device_node *of_graph_get_port_by_reg(struct device_node *parent, | |
192 | u32 reg) | |
193 | { | |
194 | struct device_node *ports, *port; | |
195 | ||
196 | ports = of_get_child_by_name(parent, "ports"); | |
197 | if (ports) | |
198 | parent = ports; | |
199 | ||
200 | port = of_get_child_by_name_reg(parent, "port", reg); | |
201 | ||
202 | of_node_put(ports); | |
203 | ||
204 | return port; | |
205 | } | |
206 | ||
207 | static struct device_node * | |
208 | of_graph_get_endpoint_by_reg(struct device_node *port, u32 reg) | |
209 | { | |
210 | return of_get_child_by_name_reg(port, "endpoint", reg); | |
211 | } | |
212 | ||
213 | static struct device_node * | |
214 | of_graph_get_remote_port_parent(const struct device_node *node) | |
215 | { | |
216 | struct device_node *np; | |
217 | unsigned int depth; | |
218 | ||
219 | np = of_parse_phandle(node, "remote-endpoint", 0); | |
220 | ||
221 | /* Walk 3 levels up only if there is 'ports' node. */ | |
222 | for (depth = 3; depth && np; depth--) { | |
223 | np = of_get_next_parent(np); | |
224 | if (depth == 2 && of_node_cmp(np->name, "ports")) | |
225 | break; | |
226 | } | |
227 | return np; | |
228 | } | |
229 | ||
230 | enum { | |
231 | FIMD_PORT_IN0, | |
232 | FIMD_PORT_IN1, | |
233 | FIMD_PORT_IN2, | |
234 | FIMD_PORT_RGB, | |
235 | FIMD_PORT_WRB, | |
236 | }; | |
237 | ||
f46ed1ab | 238 | static struct device_node *exynos_dpi_of_find_panel_node(struct device *dev) |
14b6873a AH |
239 | { |
240 | struct device_node *np, *ep; | |
241 | ||
242 | np = of_graph_get_port_by_reg(dev->of_node, FIMD_PORT_RGB); | |
243 | if (!np) | |
244 | return NULL; | |
245 | ||
246 | ep = of_graph_get_endpoint_by_reg(np, 0); | |
247 | of_node_put(np); | |
248 | if (!ep) | |
249 | return NULL; | |
250 | ||
251 | np = of_graph_get_remote_port_parent(ep); | |
252 | of_node_put(ep); | |
253 | ||
254 | return np; | |
255 | } | |
256 | ||
257 | static int exynos_dpi_parse_dt(struct exynos_dpi *ctx) | |
258 | { | |
259 | struct device *dev = ctx->dev; | |
260 | struct device_node *dn = dev->of_node; | |
261 | struct device_node *np; | |
262 | ||
263 | ctx->panel_node = exynos_dpi_of_find_panel_node(dev); | |
264 | ||
265 | np = of_get_child_by_name(dn, "display-timings"); | |
266 | if (np) { | |
267 | struct videomode *vm; | |
268 | int ret; | |
269 | ||
270 | of_node_put(np); | |
271 | ||
272 | vm = devm_kzalloc(dev, sizeof(*ctx->vm), GFP_KERNEL); | |
273 | if (!vm) | |
274 | return -ENOMEM; | |
275 | ||
276 | ret = of_get_videomode(dn, vm, 0); | |
000cc920 AH |
277 | if (ret < 0) { |
278 | devm_kfree(dev, vm); | |
14b6873a | 279 | return ret; |
000cc920 | 280 | } |
14b6873a AH |
281 | |
282 | ctx->vm = vm; | |
283 | ||
284 | return 0; | |
285 | } | |
286 | ||
287 | if (!ctx->panel_node) | |
288 | return -EINVAL; | |
289 | ||
290 | return 0; | |
291 | } | |
292 | ||
000cc920 | 293 | struct exynos_drm_display *exynos_dpi_probe(struct device *dev) |
14b6873a AH |
294 | { |
295 | struct exynos_dpi *ctx; | |
296 | int ret; | |
297 | ||
df5225bc ID |
298 | ret = exynos_drm_component_add(dev, |
299 | EXYNOS_DEVICE_TYPE_CONNECTOR, | |
300 | exynos_dpi_display.type); | |
301 | if (ret) | |
302 | return ERR_PTR(ret); | |
303 | ||
14b6873a AH |
304 | ctx = devm_kzalloc(dev, sizeof(*ctx), GFP_KERNEL); |
305 | if (!ctx) | |
df5225bc | 306 | goto err_del_component; |
14b6873a AH |
307 | |
308 | ctx->dev = dev; | |
309 | exynos_dpi_display.ctx = ctx; | |
310 | ctx->dpms_mode = DRM_MODE_DPMS_OFF; | |
311 | ||
312 | ret = exynos_dpi_parse_dt(ctx); | |
000cc920 AH |
313 | if (ret < 0) { |
314 | devm_kfree(dev, ctx); | |
df5225bc | 315 | goto err_del_component; |
000cc920 AH |
316 | } |
317 | ||
318 | if (ctx->panel_node) { | |
319 | ctx->panel = of_drm_find_panel(ctx->panel_node); | |
df5225bc ID |
320 | if (!ctx->panel) { |
321 | exynos_drm_component_del(dev, | |
322 | EXYNOS_DEVICE_TYPE_CONNECTOR); | |
000cc920 | 323 | return ERR_PTR(-EPROBE_DEFER); |
df5225bc | 324 | } |
000cc920 | 325 | } |
14b6873a | 326 | |
000cc920 | 327 | return &exynos_dpi_display; |
df5225bc ID |
328 | |
329 | err_del_component: | |
330 | exynos_drm_component_del(dev, EXYNOS_DEVICE_TYPE_CONNECTOR); | |
331 | ||
332 | return NULL; | |
14b6873a AH |
333 | } |
334 | ||
000cc920 | 335 | int exynos_dpi_remove(struct device *dev) |
14b6873a | 336 | { |
f37cd5e8 ID |
337 | struct drm_encoder *encoder = exynos_dpi_display.encoder; |
338 | struct exynos_dpi *ctx = exynos_dpi_display.ctx; | |
339 | ||
14b6873a | 340 | exynos_dpi_dpms(&exynos_dpi_display, DRM_MODE_DPMS_OFF); |
f37cd5e8 ID |
341 | encoder->funcs->destroy(encoder); |
342 | drm_connector_cleanup(&ctx->connector); | |
14b6873a | 343 | |
df5225bc ID |
344 | exynos_drm_component_del(dev, EXYNOS_DEVICE_TYPE_CONNECTOR); |
345 | ||
14b6873a AH |
346 | return 0; |
347 | } |