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.h>
 11#include <linux/of_graph.h>
 12#include <linux/regulator/consumer.h>
 13
 14#include <drm/drm_atomic_helper.h>
 15#include <drm/drm_panel.h>
 16#include <drm/drm_print.h>
 17#include <drm/drm_probe_helper.h>
 18#include <drm/drm_simple_kms_helper.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	return connector_status_connected;
 47}
 48
 49static void exynos_dpi_connector_destroy(struct drm_connector *connector)
 50{
 51	drm_connector_unregister(connector);
 52	drm_connector_cleanup(connector);
 53}
 54
 55static const struct drm_connector_funcs exynos_dpi_connector_funcs = {
 56	.detect = exynos_dpi_detect,
 57	.fill_modes = drm_helper_probe_single_connector_modes,
 58	.destroy = exynos_dpi_connector_destroy,
 59	.reset = drm_atomic_helper_connector_reset,
 60	.atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
 61	.atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
 62};
 63
 64static int exynos_dpi_get_modes(struct drm_connector *connector)
 65{
 66	struct exynos_dpi *ctx = connector_to_dpi(connector);
 67
 68	/* fimd timings gets precedence over panel modes */
 69	if (ctx->vm) {
 70		struct drm_display_mode *mode;
 71
 72		mode = drm_mode_create(connector->dev);
 73		if (!mode) {
 74			DRM_DEV_ERROR(ctx->dev,
 75				      "failed to create a new display mode\n");
 76			return 0;
 77		}
 78		drm_display_mode_from_videomode(ctx->vm, mode);
 79		mode->type = DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED;
 80		drm_mode_probed_add(connector, mode);
 81		return 1;
 82	}
 83
 84	if (ctx->panel)
 85		return drm_panel_get_modes(ctx->panel, connector);
 86
 87	return 0;
 88}
 89
 90static const struct drm_connector_helper_funcs exynos_dpi_connector_helper_funcs = {
 91	.get_modes = exynos_dpi_get_modes,
 92};
 93
 94static int exynos_dpi_create_connector(struct drm_encoder *encoder)
 95{
 96	struct exynos_dpi *ctx = encoder_to_dpi(encoder);
 97	struct drm_connector *connector = &ctx->connector;
 98	int ret;
 99
100	connector->polled = DRM_CONNECTOR_POLL_HPD;
101
102	ret = drm_connector_init(encoder->dev, connector,
103				 &exynos_dpi_connector_funcs,
104				 DRM_MODE_CONNECTOR_DPI);
105	if (ret) {
106		DRM_DEV_ERROR(ctx->dev,
107			      "failed to initialize connector with drm\n");
108		return ret;
109	}
110
111	drm_connector_helper_add(connector, &exynos_dpi_connector_helper_funcs);
112	drm_connector_attach_encoder(connector, encoder);
113
114	return 0;
115}
116
117static void exynos_dpi_mode_set(struct drm_encoder *encoder,
118				struct drm_display_mode *mode,
119				struct drm_display_mode *adjusted_mode)
120{
121}
122
123static void exynos_dpi_enable(struct drm_encoder *encoder)
124{
125	struct exynos_dpi *ctx = encoder_to_dpi(encoder);
126
127	if (ctx->panel) {
128		drm_panel_prepare(ctx->panel);
129		drm_panel_enable(ctx->panel);
130	}
131}
132
133static void exynos_dpi_disable(struct drm_encoder *encoder)
134{
135	struct exynos_dpi *ctx = encoder_to_dpi(encoder);
136
137	if (ctx->panel) {
138		drm_panel_disable(ctx->panel);
139		drm_panel_unprepare(ctx->panel);
140	}
141}
142
143static const struct drm_encoder_helper_funcs exynos_dpi_encoder_helper_funcs = {
144	.mode_set = exynos_dpi_mode_set,
145	.enable = exynos_dpi_enable,
146	.disable = exynos_dpi_disable,
147};
148
149enum {
150	FIMD_PORT_IN0,
151	FIMD_PORT_IN1,
152	FIMD_PORT_IN2,
153	FIMD_PORT_RGB,
154	FIMD_PORT_WRB,
155};
156
157static int exynos_dpi_parse_dt(struct exynos_dpi *ctx)
158{
159	struct device *dev = ctx->dev;
160	struct device_node *dn = dev->of_node;
161	struct device_node *np;
162
163	ctx->panel_node = of_graph_get_remote_node(dn, FIMD_PORT_RGB, 0);
164
165	np = of_get_child_by_name(dn, "display-timings");
166	if (np) {
167		struct videomode *vm;
168		int ret;
169
170		of_node_put(np);
171
172		vm = devm_kzalloc(dev, sizeof(*ctx->vm), GFP_KERNEL);
173		if (!vm)
174			return -ENOMEM;
175
176		ret = of_get_videomode(dn, vm, 0);
177		if (ret < 0) {
178			devm_kfree(dev, vm);
179			return ret;
180		}
181
182		ctx->vm = vm;
183
184		return 0;
185	}
186
187	if (!ctx->panel_node)
188		return -EINVAL;
189
190	return 0;
191}
192
193int exynos_dpi_bind(struct drm_device *dev, struct drm_encoder *encoder)
194{
195	int ret;
196
197	drm_simple_encoder_init(dev, encoder, DRM_MODE_ENCODER_TMDS);
198
199	drm_encoder_helper_add(encoder, &exynos_dpi_encoder_helper_funcs);
200
201	ret = exynos_drm_set_possible_crtcs(encoder, EXYNOS_DISPLAY_TYPE_LCD);
202	if (ret < 0)
203		return ret;
204
205	ret = exynos_dpi_create_connector(encoder);
206	if (ret) {
207		DRM_DEV_ERROR(encoder_to_dpi(encoder)->dev,
208			      "failed to create connector ret = %d\n", ret);
209		drm_encoder_cleanup(encoder);
210		return ret;
211	}
212
213	return 0;
214}
215
216struct drm_encoder *exynos_dpi_probe(struct device *dev)
217{
218	struct exynos_dpi *ctx;
219	int ret;
220
221	ctx = devm_kzalloc(dev, sizeof(*ctx), GFP_KERNEL);
222	if (!ctx)
223		return ERR_PTR(-ENOMEM);
224
225	ctx->dev = dev;
226
227	ret = exynos_dpi_parse_dt(ctx);
228	if (ret < 0) {
229		devm_kfree(dev, ctx);
230		return NULL;
231	}
232
233	if (ctx->panel_node) {
234		ctx->panel = of_drm_find_panel(ctx->panel_node);
235		if (IS_ERR(ctx->panel))
236			return ERR_CAST(ctx->panel);
237	}
238
239	return &ctx->encoder;
240}
241
242int exynos_dpi_remove(struct drm_encoder *encoder)
243{
244	struct exynos_dpi *ctx = encoder_to_dpi(encoder);
245
246	exynos_dpi_disable(&ctx->encoder);
247
248	return 0;
249}