1// SPDX-License-Identifier: GPL-2.0-only
  2/*
  3 * Exynos DRM Parallel output support.
  4 *
  5 * Copyright (c) 2014 Samsung Electronics Co., Ltd
  6 *
  7 * Contacts: Andrzej Hajda <a.hajda@samsung.com>
  8*/
  9
 10#include <linux/of_graph.h>
 11#include <linux/regulator/consumer.h>
 12
 13#include <drm/drm_atomic_helper.h>
 14#include <drm/drm_panel.h>
 15#include <drm/drm_print.h>
 16#include <drm/drm_probe_helper.h>
 17#include <drm/drm_simple_kms_helper.h>
 18
 19#include <video/of_videomode.h>
 20#include <video/videomode.h>
 21
 22#include "exynos_drm_crtc.h"
 23
 24struct exynos_dpi {
 25	struct drm_encoder encoder;
 26	struct device *dev;
 27	struct device_node *panel_node;
 28
 29	struct drm_panel *panel;
 30	struct drm_connector connector;
 31
 32	struct videomode *vm;
 33};
 34
 35#define connector_to_dpi(c) container_of(c, struct exynos_dpi, connector)
 36
 37static inline struct exynos_dpi *encoder_to_dpi(struct drm_encoder *e)
 38{
 39	return container_of(e, struct exynos_dpi, encoder);
 40}
 41
 42static enum drm_connector_status
 43exynos_dpi_detect(struct drm_connector *connector, bool force)
 44{
 45	struct exynos_dpi *ctx = connector_to_dpi(connector);
 46
 47	if (ctx->panel)
 48		drm_panel_attach(ctx->panel, &ctx->connector);
 49
 50	return connector_status_connected;
 51}
 52
 53static void exynos_dpi_connector_destroy(struct drm_connector *connector)
 54{
 55	drm_connector_unregister(connector);
 56	drm_connector_cleanup(connector);
 57}
 58
 59static const struct drm_connector_funcs exynos_dpi_connector_funcs = {
 60	.detect = exynos_dpi_detect,
 61	.fill_modes = drm_helper_probe_single_connector_modes,
 62	.destroy = exynos_dpi_connector_destroy,
 63	.reset = drm_atomic_helper_connector_reset,
 64	.atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
 65	.atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
 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_DEV_ERROR(ctx->dev,
 79				      "failed to create a new display mode\n");
 80			return 0;
 81		}
 82		drm_display_mode_from_videomode(ctx->vm, mode);
 83		mode->type = DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED;
 84		drm_mode_probed_add(connector, mode);
 85		return 1;
 86	}
 87
 88	if (ctx->panel)
 89		return drm_panel_get_modes(ctx->panel, connector);
 90
 91	return 0;
 92}
 93
 94static const struct drm_connector_helper_funcs exynos_dpi_connector_helper_funcs = {
 95	.get_modes = exynos_dpi_get_modes,
 96};
 97
 98static int exynos_dpi_create_connector(struct drm_encoder *encoder)
 99{
100	struct exynos_dpi *ctx = encoder_to_dpi(encoder);
101	struct drm_connector *connector = &ctx->connector;
102	int ret;
103
104	connector->polled = DRM_CONNECTOR_POLL_HPD;
105
106	ret = drm_connector_init(encoder->dev, connector,
107				 &exynos_dpi_connector_funcs,
108				 DRM_MODE_CONNECTOR_VGA);
109	if (ret) {
110		DRM_DEV_ERROR(ctx->dev,
111			      "failed to initialize connector with drm\n");
112		return ret;
113	}
114
115	drm_connector_helper_add(connector, &exynos_dpi_connector_helper_funcs);
116	drm_connector_attach_encoder(connector, encoder);
117
118	return 0;
119}
120
121static void exynos_dpi_mode_set(struct drm_encoder *encoder,
122				struct drm_display_mode *mode,
123				struct drm_display_mode *adjusted_mode)
124{
125}
126
127static void exynos_dpi_enable(struct drm_encoder *encoder)
128{
129	struct exynos_dpi *ctx = encoder_to_dpi(encoder);
130
131	if (ctx->panel) {
132		drm_panel_prepare(ctx->panel);
133		drm_panel_enable(ctx->panel);
134	}
135}
136
137static void exynos_dpi_disable(struct drm_encoder *encoder)
138{
139	struct exynos_dpi *ctx = encoder_to_dpi(encoder);
140
141	if (ctx->panel) {
142		drm_panel_disable(ctx->panel);
143		drm_panel_unprepare(ctx->panel);
144	}
145}
146
147static const struct drm_encoder_helper_funcs exynos_dpi_encoder_helper_funcs = {
148	.mode_set = exynos_dpi_mode_set,
149	.enable = exynos_dpi_enable,
150	.disable = exynos_dpi_disable,
151};
152
153enum {
154	FIMD_PORT_IN0,
155	FIMD_PORT_IN1,
156	FIMD_PORT_IN2,
157	FIMD_PORT_RGB,
158	FIMD_PORT_WRB,
159};
160
161static int exynos_dpi_parse_dt(struct exynos_dpi *ctx)
162{
163	struct device *dev = ctx->dev;
164	struct device_node *dn = dev->of_node;
165	struct device_node *np;
166
167	ctx->panel_node = of_graph_get_remote_node(dn, FIMD_PORT_RGB, 0);
168
169	np = of_get_child_by_name(dn, "display-timings");
170	if (np) {
171		struct videomode *vm;
172		int ret;
173
174		of_node_put(np);
175
176		vm = devm_kzalloc(dev, sizeof(*ctx->vm), GFP_KERNEL);
177		if (!vm)
178			return -ENOMEM;
179
180		ret = of_get_videomode(dn, vm, 0);
181		if (ret < 0) {
182			devm_kfree(dev, vm);
183			return ret;
184		}
185
186		ctx->vm = vm;
187
188		return 0;
189	}
190
191	if (!ctx->panel_node)
192		return -EINVAL;
193
194	return 0;
195}
196
197int exynos_dpi_bind(struct drm_device *dev, struct drm_encoder *encoder)
198{
199	int ret;
200
201	drm_simple_encoder_init(dev, encoder, DRM_MODE_ENCODER_TMDS);
202
203	drm_encoder_helper_add(encoder, &exynos_dpi_encoder_helper_funcs);
204
205	ret = exynos_drm_set_possible_crtcs(encoder, EXYNOS_DISPLAY_TYPE_LCD);
206	if (ret < 0)
207		return ret;
208
209	ret = exynos_dpi_create_connector(encoder);
210	if (ret) {
211		DRM_DEV_ERROR(encoder_to_dpi(encoder)->dev,
212			      "failed to create connector ret = %d\n", ret);
213		drm_encoder_cleanup(encoder);
214		return ret;
215	}
216
217	return 0;
218}
219
220struct drm_encoder *exynos_dpi_probe(struct device *dev)
221{
222	struct exynos_dpi *ctx;
223	int ret;
224
225	ctx = devm_kzalloc(dev, sizeof(*ctx), GFP_KERNEL);
226	if (!ctx)
227		return ERR_PTR(-ENOMEM);
228
229	ctx->dev = dev;
230
231	ret = exynos_dpi_parse_dt(ctx);
232	if (ret < 0) {
233		devm_kfree(dev, ctx);
234		return NULL;
235	}
236
237	if (ctx->panel_node) {
238		ctx->panel = of_drm_find_panel(ctx->panel_node);
239		if (IS_ERR(ctx->panel))
240			return ERR_CAST(ctx->panel);
241	}
242
243	return &ctx->encoder;
244}
245
246int exynos_dpi_remove(struct drm_encoder *encoder)
247{
248	struct exynos_dpi *ctx = encoder_to_dpi(encoder);
249
250	exynos_dpi_disable(&ctx->encoder);
251
252	if (ctx->panel)
253		drm_panel_detach(ctx->panel);
254
255	return 0;
256}