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