1// SPDX-License-Identifier: GPL-2.0+
  2/*
  3 * i.MX drm driver - parallel display implementation
  4 *
  5 * Copyright (C) 2012 Sascha Hauer, Pengutronix
  6 */
  7
  8#include <linux/component.h>
  9#include <linux/module.h>
 10#include <linux/platform_device.h>
 11#include <linux/videodev2.h>
 12
 13#include <video/of_display_timing.h>
 14
 15#include <drm/drm_atomic_helper.h>
 16#include <drm/drm_fb_helper.h>
 17#include <drm/drm_of.h>
 18#include <drm/drm_panel.h>
 19#include <drm/drm_probe_helper.h>
 20
 21#include "imx-drm.h"
 22
 23struct imx_parallel_display {
 24	struct drm_connector connector;
 25	struct drm_encoder encoder;
 26	struct device *dev;
 27	void *edid;
 28	int edid_len;
 29	u32 bus_format;
 30	u32 bus_flags;
 31	struct drm_display_mode mode;
 32	struct drm_panel *panel;
 33	struct drm_bridge *bridge;
 34};
 35
 36static inline struct imx_parallel_display *con_to_imxpd(struct drm_connector *c)
 37{
 38	return container_of(c, struct imx_parallel_display, connector);
 39}
 40
 41static inline struct imx_parallel_display *enc_to_imxpd(struct drm_encoder *e)
 42{
 43	return container_of(e, struct imx_parallel_display, encoder);
 44}
 45
 46static int imx_pd_connector_get_modes(struct drm_connector *connector)
 47{
 48	struct imx_parallel_display *imxpd = con_to_imxpd(connector);
 49	struct device_node *np = imxpd->dev->of_node;
 50	int num_modes;
 51
 52	num_modes = drm_panel_get_modes(imxpd->panel);
 53	if (num_modes > 0)
 54		return num_modes;
 55
 56	if (imxpd->edid) {
 57		drm_connector_update_edid_property(connector, imxpd->edid);
 58		num_modes = drm_add_edid_modes(connector, imxpd->edid);
 59	}
 60
 61	if (np) {
 62		struct drm_display_mode *mode = drm_mode_create(connector->dev);
 63		int ret;
 64
 65		if (!mode)
 66			return -EINVAL;
 67
 68		ret = of_get_drm_display_mode(np, &imxpd->mode,
 69					      &imxpd->bus_flags,
 70					      OF_USE_NATIVE_MODE);
 71		if (ret)
 72			return ret;
 73
 74		drm_mode_copy(mode, &imxpd->mode);
 75		mode->type |= DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED,
 76		drm_mode_probed_add(connector, mode);
 77		num_modes++;
 78	}
 79
 80	return num_modes;
 81}
 82
 83static struct drm_encoder *imx_pd_connector_best_encoder(
 84		struct drm_connector *connector)
 85{
 86	struct imx_parallel_display *imxpd = con_to_imxpd(connector);
 87
 88	return &imxpd->encoder;
 89}
 90
 91static void imx_pd_encoder_enable(struct drm_encoder *encoder)
 92{
 93	struct imx_parallel_display *imxpd = enc_to_imxpd(encoder);
 94
 95	drm_panel_prepare(imxpd->panel);
 96	drm_panel_enable(imxpd->panel);
 97}
 98
 99static void imx_pd_encoder_disable(struct drm_encoder *encoder)
100{
101	struct imx_parallel_display *imxpd = enc_to_imxpd(encoder);
102
103	drm_panel_disable(imxpd->panel);
104	drm_panel_unprepare(imxpd->panel);
105}
106
107static int imx_pd_encoder_atomic_check(struct drm_encoder *encoder,
108				       struct drm_crtc_state *crtc_state,
109				       struct drm_connector_state *conn_state)
110{
111	struct imx_crtc_state *imx_crtc_state = to_imx_crtc_state(crtc_state);
112	struct drm_display_info *di = &conn_state->connector->display_info;
113	struct imx_parallel_display *imxpd = enc_to_imxpd(encoder);
114
115	if (!imxpd->bus_format && di->num_bus_formats) {
116		imx_crtc_state->bus_flags = di->bus_flags;
117		imx_crtc_state->bus_format = di->bus_formats[0];
118	} else {
119		imx_crtc_state->bus_flags = imxpd->bus_flags;
120		imx_crtc_state->bus_format = imxpd->bus_format;
121	}
122	imx_crtc_state->di_hsync_pin = 2;
123	imx_crtc_state->di_vsync_pin = 3;
124
125	return 0;
126}
127
128static const struct drm_connector_funcs imx_pd_connector_funcs = {
129	.fill_modes = drm_helper_probe_single_connector_modes,
130	.destroy = imx_drm_connector_destroy,
131	.reset = drm_atomic_helper_connector_reset,
132	.atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
133	.atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
134};
135
136static const struct drm_connector_helper_funcs imx_pd_connector_helper_funcs = {
137	.get_modes = imx_pd_connector_get_modes,
138	.best_encoder = imx_pd_connector_best_encoder,
139};
140
141static const struct drm_encoder_funcs imx_pd_encoder_funcs = {
142	.destroy = imx_drm_encoder_destroy,
143};
144
145static const struct drm_encoder_helper_funcs imx_pd_encoder_helper_funcs = {
146	.enable = imx_pd_encoder_enable,
147	.disable = imx_pd_encoder_disable,
148	.atomic_check = imx_pd_encoder_atomic_check,
149};
150
151static int imx_pd_register(struct drm_device *drm,
152	struct imx_parallel_display *imxpd)
153{
154	struct drm_encoder *encoder = &imxpd->encoder;
155	int ret;
156
157	ret = imx_drm_encoder_parse_of(drm, encoder, imxpd->dev->of_node);
158	if (ret)
159		return ret;
160
161	/* set the connector's dpms to OFF so that
162	 * drm_helper_connector_dpms() won't return
163	 * immediately since the current state is ON
164	 * at this point.
165	 */
166	imxpd->connector.dpms = DRM_MODE_DPMS_OFF;
167
168	drm_encoder_helper_add(encoder, &imx_pd_encoder_helper_funcs);
169	drm_encoder_init(drm, encoder, &imx_pd_encoder_funcs,
170			 DRM_MODE_ENCODER_NONE, NULL);
171
172	if (!imxpd->bridge) {
173		drm_connector_helper_add(&imxpd->connector,
174				&imx_pd_connector_helper_funcs);
175		drm_connector_init(drm, &imxpd->connector,
176				   &imx_pd_connector_funcs,
177				   DRM_MODE_CONNECTOR_DPI);
178	}
179
180	if (imxpd->panel)
181		drm_panel_attach(imxpd->panel, &imxpd->connector);
182
183	if (imxpd->bridge) {
184		ret = drm_bridge_attach(encoder, imxpd->bridge, NULL);
185		if (ret < 0) {
186			dev_err(imxpd->dev, "failed to attach bridge: %d\n",
187				ret);
188			return ret;
189		}
190	} else {
191		drm_connector_attach_encoder(&imxpd->connector, encoder);
192	}
193
194	return 0;
195}
196
197static int imx_pd_bind(struct device *dev, struct device *master, void *data)
198{
199	struct drm_device *drm = data;
200	struct device_node *np = dev->of_node;
201	const u8 *edidp;
202	struct imx_parallel_display *imxpd;
203	int ret;
204	u32 bus_format = 0;
205	const char *fmt;
206
207	imxpd = devm_kzalloc(dev, sizeof(*imxpd), GFP_KERNEL);
208	if (!imxpd)
209		return -ENOMEM;
210
211	edidp = of_get_property(np, "edid", &imxpd->edid_len);
212	if (edidp)
213		imxpd->edid = kmemdup(edidp, imxpd->edid_len, GFP_KERNEL);
214
215	ret = of_property_read_string(np, "interface-pix-fmt", &fmt);
216	if (!ret) {
217		if (!strcmp(fmt, "rgb24"))
218			bus_format = MEDIA_BUS_FMT_RGB888_1X24;
219		else if (!strcmp(fmt, "rgb565"))
220			bus_format = MEDIA_BUS_FMT_RGB565_1X16;
221		else if (!strcmp(fmt, "bgr666"))
222			bus_format = MEDIA_BUS_FMT_RGB666_1X18;
223		else if (!strcmp(fmt, "lvds666"))
224			bus_format = MEDIA_BUS_FMT_RGB666_1X24_CPADHI;
225	}
226	imxpd->bus_format = bus_format;
227
228	/* port@1 is the output port */
229	ret = drm_of_find_panel_or_bridge(np, 1, 0, &imxpd->panel, &imxpd->bridge);
230	if (ret && ret != -ENODEV)
231		return ret;
232
233	imxpd->dev = dev;
234
235	ret = imx_pd_register(drm, imxpd);
236	if (ret)
237		return ret;
238
239	dev_set_drvdata(dev, imxpd);
240
241	return 0;
242}
243
244static void imx_pd_unbind(struct device *dev, struct device *master,
245	void *data)
246{
247	struct imx_parallel_display *imxpd = dev_get_drvdata(dev);
248
249	if (imxpd->panel)
250		drm_panel_detach(imxpd->panel);
251
252	kfree(imxpd->edid);
253}
254
255static const struct component_ops imx_pd_ops = {
256	.bind	= imx_pd_bind,
257	.unbind	= imx_pd_unbind,
258};
259
260static int imx_pd_probe(struct platform_device *pdev)
261{
262	return component_add(&pdev->dev, &imx_pd_ops);
263}
264
265static int imx_pd_remove(struct platform_device *pdev)
266{
267	component_del(&pdev->dev, &imx_pd_ops);
268
269	return 0;
270}
271
272static const struct of_device_id imx_pd_dt_ids[] = {
273	{ .compatible = "fsl,imx-parallel-display", },
274	{ /* sentinel */ }
275};
276MODULE_DEVICE_TABLE(of, imx_pd_dt_ids);
277
278static struct platform_driver imx_pd_driver = {
279	.probe		= imx_pd_probe,
280	.remove		= imx_pd_remove,
281	.driver		= {
282		.of_match_table = imx_pd_dt_ids,
283		.name	= "imx-parallel-display",
284	},
285};
286
287module_platform_driver(imx_pd_driver);
288
289MODULE_DESCRIPTION("i.MX parallel display driver");
290MODULE_AUTHOR("Sascha Hauer, Pengutronix");
291MODULE_LICENSE("GPL");
292MODULE_ALIAS("platform:imx-parallel-display");