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	return connector_status_connected;
 46}
 47
 48static void exynos_dpi_connector_destroy(struct drm_connector *connector)
 49{
 50	drm_connector_unregister(connector);
 51	drm_connector_cleanup(connector);
 52}
 53
 54static const struct drm_connector_funcs exynos_dpi_connector_funcs = {
 55	.detect = exynos_dpi_detect,
 56	.fill_modes = drm_helper_probe_single_connector_modes,
 57	.destroy = exynos_dpi_connector_destroy,
 58	.reset = drm_atomic_helper_connector_reset,
 59	.atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
 60	.atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
 61};
 62
 63static int exynos_dpi_get_modes(struct drm_connector *connector)
 64{
 65	struct exynos_dpi *ctx = connector_to_dpi(connector);
 66
 67	/* fimd timings gets precedence over panel modes */
 68	if (ctx->vm) {
 69		struct drm_display_mode *mode;
 70
 71		mode = drm_mode_create(connector->dev);
 72		if (!mode) {
 73			DRM_DEV_ERROR(ctx->dev,
 74				      "failed to create a new display mode\n");
 75			return 0;
 76		}
 77		drm_display_mode_from_videomode(ctx->vm, mode);
 78		mode->type = DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED;
 79		drm_mode_probed_add(connector, mode);
 80		return 1;
 81	}
 82
 83	if (ctx->panel)
 84		return drm_panel_get_modes(ctx->panel, connector);
 85
 86	return 0;
 87}
 88
 89static const struct drm_connector_helper_funcs exynos_dpi_connector_helper_funcs = {
 90	.get_modes = exynos_dpi_get_modes,
 91};
 92
 93static int exynos_dpi_create_connector(struct drm_encoder *encoder)
 94{
 95	struct exynos_dpi *ctx = encoder_to_dpi(encoder);
 96	struct drm_connector *connector = &ctx->connector;
 97	int ret;
 98
 99	connector->polled = DRM_CONNECTOR_POLL_HPD;
100
101	ret = drm_connector_init(encoder->dev, connector,
102				 &exynos_dpi_connector_funcs,
103				 DRM_MODE_CONNECTOR_VGA);
104	if (ret) {
105		DRM_DEV_ERROR(ctx->dev,
106			      "failed to initialize connector with drm\n");
107		return ret;
108	}
109
110	drm_connector_helper_add(connector, &exynos_dpi_connector_helper_funcs);
111	drm_connector_attach_encoder(connector, encoder);
112
113	return 0;
114}
115
116static void exynos_dpi_mode_set(struct drm_encoder *encoder,
117				struct drm_display_mode *mode,
118				struct drm_display_mode *adjusted_mode)
119{
120}
121
122static void exynos_dpi_enable(struct drm_encoder *encoder)
123{
124	struct exynos_dpi *ctx = encoder_to_dpi(encoder);
125
126	if (ctx->panel) {
127		drm_panel_prepare(ctx->panel);
128		drm_panel_enable(ctx->panel);
129	}
130}
131
132static void exynos_dpi_disable(struct drm_encoder *encoder)
133{
134	struct exynos_dpi *ctx = encoder_to_dpi(encoder);
135
136	if (ctx->panel) {
137		drm_panel_disable(ctx->panel);
138		drm_panel_unprepare(ctx->panel);
139	}
140}
141
142static const struct drm_encoder_helper_funcs exynos_dpi_encoder_helper_funcs = {
143	.mode_set = exynos_dpi_mode_set,
144	.enable = exynos_dpi_enable,
145	.disable = exynos_dpi_disable,
146};
147
148enum {
149	FIMD_PORT_IN0,
150	FIMD_PORT_IN1,
151	FIMD_PORT_IN2,
152	FIMD_PORT_RGB,
153	FIMD_PORT_WRB,
154};
155
156static int exynos_dpi_parse_dt(struct exynos_dpi *ctx)
157{
158	struct device *dev = ctx->dev;
159	struct device_node *dn = dev->of_node;
160	struct device_node *np;
161
162	ctx->panel_node = of_graph_get_remote_node(dn, FIMD_PORT_RGB, 0);
163
164	np = of_get_child_by_name(dn, "display-timings");
165	if (np) {
166		struct videomode *vm;
167		int ret;
168
169		of_node_put(np);
170
171		vm = devm_kzalloc(dev, sizeof(*ctx->vm), GFP_KERNEL);
172		if (!vm)
173			return -ENOMEM;
174
175		ret = of_get_videomode(dn, vm, 0);
176		if (ret < 0) {
177			devm_kfree(dev, vm);
178			return ret;
179		}
180
181		ctx->vm = vm;
182
183		return 0;
184	}
185
186	if (!ctx->panel_node)
187		return -EINVAL;
188
189	return 0;
190}
191
192int exynos_dpi_bind(struct drm_device *dev, struct drm_encoder *encoder)
193{
194	int ret;
195
196	drm_simple_encoder_init(dev, encoder, DRM_MODE_ENCODER_TMDS);
197
198	drm_encoder_helper_add(encoder, &exynos_dpi_encoder_helper_funcs);
199
200	ret = exynos_drm_set_possible_crtcs(encoder, EXYNOS_DISPLAY_TYPE_LCD);
201	if (ret < 0)
202		return ret;
203
204	ret = exynos_dpi_create_connector(encoder);
205	if (ret) {
206		DRM_DEV_ERROR(encoder_to_dpi(encoder)->dev,
207			      "failed to create connector ret = %d\n", ret);
208		drm_encoder_cleanup(encoder);
209		return ret;
210	}
211
212	return 0;
213}
214
215struct drm_encoder *exynos_dpi_probe(struct device *dev)
216{
217	struct exynos_dpi *ctx;
218	int ret;
219
220	ctx = devm_kzalloc(dev, sizeof(*ctx), GFP_KERNEL);
221	if (!ctx)
222		return ERR_PTR(-ENOMEM);
223
224	ctx->dev = dev;
225
226	ret = exynos_dpi_parse_dt(ctx);
227	if (ret < 0) {
228		devm_kfree(dev, ctx);
229		return NULL;
230	}
231
232	if (ctx->panel_node) {
233		ctx->panel = of_drm_find_panel(ctx->panel_node);
234		if (IS_ERR(ctx->panel))
235			return ERR_CAST(ctx->panel);
236	}
237
238	return &ctx->encoder;
239}
240
241int exynos_dpi_remove(struct drm_encoder *encoder)
242{
243	struct exynos_dpi *ctx = encoder_to_dpi(encoder);
244
245	exynos_dpi_disable(&ctx->encoder);
246
247	return 0;
248}