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13#include <drm/drmP.h>
14#include <drm/drm_crtc_helper.h>
15#include <drm/drm_panel.h>
16#include <drm/drm_atomic_helper.h>
17
18#include <linux/regulator/consumer.h>
19
20#include <video/of_videomode.h>
21#include <video/videomode.h>
22
23#include "exynos_drm_crtc.h"
24
25struct exynos_dpi {
26 struct drm_encoder encoder;
27 struct device *dev;
28 struct device_node *panel_node;
29
30 struct drm_panel *panel;
31 struct drm_connector connector;
32
33 struct videomode *vm;
34};
35
36#define connector_to_dpi(c) container_of(c, struct exynos_dpi, connector)
37
38static inline struct exynos_dpi *encoder_to_dpi(struct drm_encoder *e)
39{
40 return container_of(e, struct exynos_dpi, encoder);
41}
42
43static enum drm_connector_status
44exynos_dpi_detect(struct drm_connector *connector, bool force)
45{
46 struct exynos_dpi *ctx = connector_to_dpi(connector);
47
48 if (ctx->panel && !ctx->panel->connector)
49 drm_panel_attach(ctx->panel, &ctx->connector);
50
51 return connector_status_connected;
52}
53
54static void exynos_dpi_connector_destroy(struct drm_connector *connector)
55{
56 drm_connector_unregister(connector);
57 drm_connector_cleanup(connector);
58}
59
60static struct drm_connector_funcs exynos_dpi_connector_funcs = {
61 .dpms = drm_atomic_helper_connector_dpms,
62 .detect = exynos_dpi_detect,
63 .fill_modes = drm_helper_probe_single_connector_modes,
64 .destroy = exynos_dpi_connector_destroy,
65 .reset = drm_atomic_helper_connector_reset,
66 .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
67 .atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
68};
69
70static int exynos_dpi_get_modes(struct drm_connector *connector)
71{
72 struct exynos_dpi *ctx = connector_to_dpi(connector);
73
74
75 if (ctx->vm) {
76 struct drm_display_mode *mode;
77
78 mode = drm_mode_create(connector->dev);
79 if (!mode) {
80 DRM_ERROR("failed to create a new display mode\n");
81 return 0;
82 }
83 drm_display_mode_from_videomode(ctx->vm, mode);
84 mode->type = DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED;
85 drm_mode_probed_add(connector, mode);
86 return 1;
87 }
88
89 if (ctx->panel)
90 return ctx->panel->funcs->get_modes(ctx->panel);
91
92 return 0;
93}
94
95static struct drm_encoder *
96exynos_dpi_best_encoder(struct drm_connector *connector)
97{
98 struct exynos_dpi *ctx = connector_to_dpi(connector);
99
100 return &ctx->encoder;
101}
102
103static struct drm_connector_helper_funcs exynos_dpi_connector_helper_funcs = {
104 .get_modes = exynos_dpi_get_modes,
105 .best_encoder = exynos_dpi_best_encoder,
106};
107
108static int exynos_dpi_create_connector(struct drm_encoder *encoder)
109{
110 struct exynos_dpi *ctx = encoder_to_dpi(encoder);
111 struct drm_connector *connector = &ctx->connector;
112 int ret;
113
114 connector->polled = DRM_CONNECTOR_POLL_HPD;
115
116 ret = drm_connector_init(encoder->dev, connector,
117 &exynos_dpi_connector_funcs,
118 DRM_MODE_CONNECTOR_VGA);
119 if (ret) {
120 DRM_ERROR("failed to initialize connector with drm\n");
121 return ret;
122 }
123
124 drm_connector_helper_add(connector, &exynos_dpi_connector_helper_funcs);
125 drm_connector_register(connector);
126 drm_mode_connector_attach_encoder(connector, encoder);
127
128 return 0;
129}
130
131static bool exynos_dpi_mode_fixup(struct drm_encoder *encoder,
132 const struct drm_display_mode *mode,
133 struct drm_display_mode *adjusted_mode)
134{
135 return true;
136}
137
138static void exynos_dpi_mode_set(struct drm_encoder *encoder,
139 struct drm_display_mode *mode,
140 struct drm_display_mode *adjusted_mode)
141{
142}
143
144static void exynos_dpi_enable(struct drm_encoder *encoder)
145{
146 struct exynos_dpi *ctx = encoder_to_dpi(encoder);
147
148 if (ctx->panel) {
149 drm_panel_prepare(ctx->panel);
150 drm_panel_enable(ctx->panel);
151 }
152}
153
154static void exynos_dpi_disable(struct drm_encoder *encoder)
155{
156 struct exynos_dpi *ctx = encoder_to_dpi(encoder);
157
158 if (ctx->panel) {
159 drm_panel_disable(ctx->panel);
160 drm_panel_unprepare(ctx->panel);
161 }
162}
163
164static struct drm_encoder_helper_funcs exynos_dpi_encoder_helper_funcs = {
165 .mode_fixup = exynos_dpi_mode_fixup,
166 .mode_set = exynos_dpi_mode_set,
167 .enable = exynos_dpi_enable,
168 .disable = exynos_dpi_disable,
169};
170
171static struct drm_encoder_funcs exynos_dpi_encoder_funcs = {
172 .destroy = drm_encoder_cleanup,
173};
174
175
176static struct device_node *
177of_get_child_by_name_reg(struct device_node *parent, const char *name, u32 reg)
178{
179 struct device_node *np;
180
181 for_each_child_of_node(parent, np) {
182 u32 r;
183
184 if (!np->name || of_node_cmp(np->name, name))
185 continue;
186
187 if (of_property_read_u32(np, "reg", &r) < 0)
188 r = 0;
189
190 if (reg == r)
191 break;
192 }
193
194 return np;
195}
196
197static struct device_node *of_graph_get_port_by_reg(struct device_node *parent,
198 u32 reg)
199{
200 struct device_node *ports, *port;
201
202 ports = of_get_child_by_name(parent, "ports");
203 if (ports)
204 parent = ports;
205
206 port = of_get_child_by_name_reg(parent, "port", reg);
207
208 of_node_put(ports);
209
210 return port;
211}
212
213static struct device_node *
214of_graph_get_endpoint_by_reg(struct device_node *port, u32 reg)
215{
216 return of_get_child_by_name_reg(port, "endpoint", reg);
217}
218
219static struct device_node *
220of_graph_get_remote_port_parent(const struct device_node *node)
221{
222 struct device_node *np;
223 unsigned int depth;
224
225 np = of_parse_phandle(node, "remote-endpoint", 0);
226
227
228 for (depth = 3; depth && np; depth--) {
229 np = of_get_next_parent(np);
230 if (depth == 2 && of_node_cmp(np->name, "ports"))
231 break;
232 }
233 return np;
234}
235
236enum {
237 FIMD_PORT_IN0,
238 FIMD_PORT_IN1,
239 FIMD_PORT_IN2,
240 FIMD_PORT_RGB,
241 FIMD_PORT_WRB,
242};
243
244static struct device_node *exynos_dpi_of_find_panel_node(struct device *dev)
245{
246 struct device_node *np, *ep;
247
248 np = of_graph_get_port_by_reg(dev->of_node, FIMD_PORT_RGB);
249 if (!np)
250 return NULL;
251
252 ep = of_graph_get_endpoint_by_reg(np, 0);
253 of_node_put(np);
254 if (!ep)
255 return NULL;
256
257 np = of_graph_get_remote_port_parent(ep);
258 of_node_put(ep);
259
260 return np;
261}
262
263static int exynos_dpi_parse_dt(struct exynos_dpi *ctx)
264{
265 struct device *dev = ctx->dev;
266 struct device_node *dn = dev->of_node;
267 struct device_node *np;
268
269 ctx->panel_node = exynos_dpi_of_find_panel_node(dev);
270
271 np = of_get_child_by_name(dn, "display-timings");
272 if (np) {
273 struct videomode *vm;
274 int ret;
275
276 of_node_put(np);
277
278 vm = devm_kzalloc(dev, sizeof(*ctx->vm), GFP_KERNEL);
279 if (!vm)
280 return -ENOMEM;
281
282 ret = of_get_videomode(dn, vm, 0);
283 if (ret < 0) {
284 devm_kfree(dev, vm);
285 return ret;
286 }
287
288 ctx->vm = vm;
289
290 return 0;
291 }
292
293 if (!ctx->panel_node)
294 return -EINVAL;
295
296 return 0;
297}
298
299int exynos_dpi_bind(struct drm_device *dev, struct drm_encoder *encoder)
300{
301 int ret;
302
303 ret = exynos_drm_crtc_get_pipe_from_type(dev, EXYNOS_DISPLAY_TYPE_LCD);
304 if (ret < 0)
305 return ret;
306
307 encoder->possible_crtcs = 1 << ret;
308
309 DRM_DEBUG_KMS("possible_crtcs = 0x%x\n", encoder->possible_crtcs);
310
311 drm_encoder_init(dev, encoder, &exynos_dpi_encoder_funcs,
312 DRM_MODE_ENCODER_TMDS);
313
314 drm_encoder_helper_add(encoder, &exynos_dpi_encoder_helper_funcs);
315
316 ret = exynos_dpi_create_connector(encoder);
317 if (ret) {
318 DRM_ERROR("failed to create connector ret = %d\n", ret);
319 drm_encoder_cleanup(encoder);
320 return ret;
321 }
322
323 return 0;
324}
325
326struct drm_encoder *exynos_dpi_probe(struct device *dev)
327{
328 struct exynos_dpi *ctx;
329 int ret;
330
331 ctx = devm_kzalloc(dev, sizeof(*ctx), GFP_KERNEL);
332 if (!ctx)
333 return ERR_PTR(-ENOMEM);
334
335 ctx->dev = dev;
336
337 ret = exynos_dpi_parse_dt(ctx);
338 if (ret < 0) {
339 devm_kfree(dev, ctx);
340 return NULL;
341 }
342
343 if (ctx->panel_node) {
344 ctx->panel = of_drm_find_panel(ctx->panel_node);
345 if (!ctx->panel)
346 return ERR_PTR(-EPROBE_DEFER);
347 }
348
349 return &ctx->encoder;
350}
351
352int exynos_dpi_remove(struct drm_encoder *encoder)
353{
354 struct exynos_dpi *ctx = encoder_to_dpi(encoder);
355
356 exynos_dpi_disable(&ctx->encoder);
357
358 if (ctx->panel)
359 drm_panel_detach(ctx->panel);
360
361 return 0;
362}
363
