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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 const 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 const 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 void exynos_dpi_mode_set(struct drm_encoder *encoder,
132 struct drm_display_mode *mode,
133 struct drm_display_mode *adjusted_mode)
134{
135}
136
137static void exynos_dpi_enable(struct drm_encoder *encoder)
138{
139 struct exynos_dpi *ctx = encoder_to_dpi(encoder);
140
141 if (ctx->panel) {
142 drm_panel_prepare(ctx->panel);
143 drm_panel_enable(ctx->panel);
144 }
145}
146
147static void exynos_dpi_disable(struct drm_encoder *encoder)
148{
149 struct exynos_dpi *ctx = encoder_to_dpi(encoder);
150
151 if (ctx->panel) {
152 drm_panel_disable(ctx->panel);
153 drm_panel_unprepare(ctx->panel);
154 }
155}
156
157static const struct drm_encoder_helper_funcs exynos_dpi_encoder_helper_funcs = {
158 .mode_set = exynos_dpi_mode_set,
159 .enable = exynos_dpi_enable,
160 .disable = exynos_dpi_disable,
161};
162
163static const struct drm_encoder_funcs exynos_dpi_encoder_funcs = {
164 .destroy = drm_encoder_cleanup,
165};
166
167
168static struct device_node *
169of_get_child_by_name_reg(struct device_node *parent, const char *name, u32 reg)
170{
171 struct device_node *np;
172
173 for_each_child_of_node(parent, np) {
174 u32 r;
175
176 if (!np->name || of_node_cmp(np->name, name))
177 continue;
178
179 if (of_property_read_u32(np, "reg", &r) < 0)
180 r = 0;
181
182 if (reg == r)
183 break;
184 }
185
186 return np;
187}
188
189static struct device_node *of_graph_get_port_by_reg(struct device_node *parent,
190 u32 reg)
191{
192 struct device_node *ports, *port;
193
194 ports = of_get_child_by_name(parent, "ports");
195 if (ports)
196 parent = ports;
197
198 port = of_get_child_by_name_reg(parent, "port", reg);
199
200 of_node_put(ports);
201
202 return port;
203}
204
205static struct device_node *
206of_graph_get_endpoint_by_reg(struct device_node *port, u32 reg)
207{
208 return of_get_child_by_name_reg(port, "endpoint", reg);
209}
210
211static struct device_node *
212of_graph_get_remote_port_parent(const struct device_node *node)
213{
214 struct device_node *np;
215 unsigned int depth;
216
217 np = of_parse_phandle(node, "remote-endpoint", 0);
218
219
220 for (depth = 3; depth && np; depth--) {
221 np = of_get_next_parent(np);
222 if (depth == 2 && of_node_cmp(np->name, "ports"))
223 break;
224 }
225 return np;
226}
227
228enum {
229 FIMD_PORT_IN0,
230 FIMD_PORT_IN1,
231 FIMD_PORT_IN2,
232 FIMD_PORT_RGB,
233 FIMD_PORT_WRB,
234};
235
236static struct device_node *exynos_dpi_of_find_panel_node(struct device *dev)
237{
238 struct device_node *np, *ep;
239
240 np = of_graph_get_port_by_reg(dev->of_node, FIMD_PORT_RGB);
241 if (!np)
242 return NULL;
243
244 ep = of_graph_get_endpoint_by_reg(np, 0);
245 of_node_put(np);
246 if (!ep)
247 return NULL;
248
249 np = of_graph_get_remote_port_parent(ep);
250 of_node_put(ep);
251
252 return np;
253}
254
255static int exynos_dpi_parse_dt(struct exynos_dpi *ctx)
256{
257 struct device *dev = ctx->dev;
258 struct device_node *dn = dev->of_node;
259 struct device_node *np;
260
261 ctx->panel_node = exynos_dpi_of_find_panel_node(dev);
262
263 np = of_get_child_by_name(dn, "display-timings");
264 if (np) {
265 struct videomode *vm;
266 int ret;
267
268 of_node_put(np);
269
270 vm = devm_kzalloc(dev, sizeof(*ctx->vm), GFP_KERNEL);
271 if (!vm)
272 return -ENOMEM;
273
274 ret = of_get_videomode(dn, vm, 0);
275 if (ret < 0) {
276 devm_kfree(dev, vm);
277 return ret;
278 }
279
280 ctx->vm = vm;
281
282 return 0;
283 }
284
285 if (!ctx->panel_node)
286 return -EINVAL;
287
288 return 0;
289}
290
291int exynos_dpi_bind(struct drm_device *dev, struct drm_encoder *encoder)
292{
293 int ret;
294
295 ret = exynos_drm_crtc_get_pipe_from_type(dev, EXYNOS_DISPLAY_TYPE_LCD);
296 if (ret < 0)
297 return ret;
298
299 encoder->possible_crtcs = 1 << ret;
300
301 DRM_DEBUG_KMS("possible_crtcs = 0x%x\n", encoder->possible_crtcs);
302
303 drm_encoder_init(dev, encoder, &exynos_dpi_encoder_funcs,
304 DRM_MODE_ENCODER_TMDS, NULL);
305
306 drm_encoder_helper_add(encoder, &exynos_dpi_encoder_helper_funcs);
307
308 ret = exynos_dpi_create_connector(encoder);
309 if (ret) {
310 DRM_ERROR("failed to create connector ret = %d\n", ret);
311 drm_encoder_cleanup(encoder);
312 return ret;
313 }
314
315 return 0;
316}
317
318struct drm_encoder *exynos_dpi_probe(struct device *dev)
319{
320 struct exynos_dpi *ctx;
321 int ret;
322
323 ctx = devm_kzalloc(dev, sizeof(*ctx), GFP_KERNEL);
324 if (!ctx)
325 return ERR_PTR(-ENOMEM);
326
327 ctx->dev = dev;
328
329 ret = exynos_dpi_parse_dt(ctx);
330 if (ret < 0) {
331 devm_kfree(dev, ctx);
332 return NULL;
333 }
334
335 if (ctx->panel_node) {
336 ctx->panel = of_drm_find_panel(ctx->panel_node);
337 if (!ctx->panel)
338 return ERR_PTR(-EPROBE_DEFER);
339 }
340
341 return &ctx->encoder;
342}
343
344int exynos_dpi_remove(struct drm_encoder *encoder)
345{
346 struct exynos_dpi *ctx = encoder_to_dpi(encoder);
347
348 exynos_dpi_disable(&ctx->encoder);
349
350 if (ctx->panel)
351 drm_panel_detach(ctx->panel);
352
353 return 0;
354}
355
