2 * i.MX drm driver - parallel display implementation
4 * Copyright (C) 2012 Sascha Hauer, Pengutronix
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public License
8 * as published by the Free Software Foundation; either version 2
9 * of the License, or (at your option) any later version.
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
16 #include <linux/component.h>
17 #include <linux/module.h>
19 #include <drm/drm_fb_helper.h>
20 #include <drm/drm_crtc_helper.h>
21 #include <drm/drm_panel.h>
22 #include <linux/videodev2.h>
23 #include <video/of_display_timing.h>
24 #include <linux/of_graph.h>
28 #define con_to_imxpd(x) container_of(x, struct imx_parallel_display, connector)
29 #define enc_to_imxpd(x) container_of(x, struct imx_parallel_display, encoder)
31 struct imx_parallel_display {
32 struct drm_connector connector;
33 struct drm_encoder encoder;
38 struct drm_display_mode mode;
39 struct drm_panel *panel;
42 static enum drm_connector_status imx_pd_connector_detect(
43 struct drm_connector *connector, bool force)
45 return connector_status_connected;
48 static int imx_pd_connector_get_modes(struct drm_connector *connector)
50 struct imx_parallel_display *imxpd = con_to_imxpd(connector);
51 struct device_node *np = imxpd->dev->of_node;
54 if (imxpd->panel && imxpd->panel->funcs &&
55 imxpd->panel->funcs->get_modes) {
56 struct drm_display_info *di = &connector->display_info;
58 num_modes = imxpd->panel->funcs->get_modes(imxpd->panel);
59 if (!imxpd->bus_format && di->num_bus_formats)
60 imxpd->bus_format = di->bus_formats[0];
66 drm_mode_connector_update_edid_property(connector, imxpd->edid);
67 num_modes = drm_add_edid_modes(connector, imxpd->edid);
71 struct drm_display_mode *mode = drm_mode_create(connector->dev);
75 of_get_drm_display_mode(np, &imxpd->mode, OF_USE_NATIVE_MODE);
76 drm_mode_copy(mode, &imxpd->mode);
77 mode->type |= DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED,
78 drm_mode_probed_add(connector, mode);
85 static struct drm_encoder *imx_pd_connector_best_encoder(
86 struct drm_connector *connector)
88 struct imx_parallel_display *imxpd = con_to_imxpd(connector);
90 return &imxpd->encoder;
93 static void imx_pd_encoder_dpms(struct drm_encoder *encoder, int mode)
95 struct imx_parallel_display *imxpd = enc_to_imxpd(encoder);
97 if (mode != DRM_MODE_DPMS_ON)
98 drm_panel_disable(imxpd->panel);
100 drm_panel_enable(imxpd->panel);
103 static void imx_pd_encoder_prepare(struct drm_encoder *encoder)
105 struct imx_parallel_display *imxpd = enc_to_imxpd(encoder);
106 imx_drm_set_bus_config(encoder, imxpd->bus_format, 2, 3,
107 imxpd->connector.display_info.bus_flags);
110 static void imx_pd_encoder_commit(struct drm_encoder *encoder)
112 struct imx_parallel_display *imxpd = enc_to_imxpd(encoder);
114 drm_panel_prepare(imxpd->panel);
115 drm_panel_enable(imxpd->panel);
118 static void imx_pd_encoder_mode_set(struct drm_encoder *encoder,
119 struct drm_display_mode *orig_mode,
120 struct drm_display_mode *mode)
124 static void imx_pd_encoder_disable(struct drm_encoder *encoder)
126 struct imx_parallel_display *imxpd = enc_to_imxpd(encoder);
128 drm_panel_disable(imxpd->panel);
129 drm_panel_unprepare(imxpd->panel);
132 static const struct drm_connector_funcs imx_pd_connector_funcs = {
133 .dpms = drm_helper_connector_dpms,
134 .fill_modes = drm_helper_probe_single_connector_modes,
135 .detect = imx_pd_connector_detect,
136 .destroy = imx_drm_connector_destroy,
139 static const struct drm_connector_helper_funcs imx_pd_connector_helper_funcs = {
140 .get_modes = imx_pd_connector_get_modes,
141 .best_encoder = imx_pd_connector_best_encoder,
144 static const struct drm_encoder_funcs imx_pd_encoder_funcs = {
145 .destroy = imx_drm_encoder_destroy,
148 static const struct drm_encoder_helper_funcs imx_pd_encoder_helper_funcs = {
149 .dpms = imx_pd_encoder_dpms,
150 .prepare = imx_pd_encoder_prepare,
151 .commit = imx_pd_encoder_commit,
152 .mode_set = imx_pd_encoder_mode_set,
153 .disable = imx_pd_encoder_disable,
156 static int imx_pd_register(struct drm_device *drm,
157 struct imx_parallel_display *imxpd)
161 ret = imx_drm_encoder_parse_of(drm, &imxpd->encoder,
162 imxpd->dev->of_node);
166 /* set the connector's dpms to OFF so that
167 * drm_helper_connector_dpms() won't return
168 * immediately since the current state is ON
171 imxpd->connector.dpms = DRM_MODE_DPMS_OFF;
173 drm_encoder_helper_add(&imxpd->encoder, &imx_pd_encoder_helper_funcs);
174 drm_encoder_init(drm, &imxpd->encoder, &imx_pd_encoder_funcs,
175 DRM_MODE_ENCODER_NONE, NULL);
177 drm_connector_helper_add(&imxpd->connector,
178 &imx_pd_connector_helper_funcs);
179 drm_connector_init(drm, &imxpd->connector, &imx_pd_connector_funcs,
180 DRM_MODE_CONNECTOR_VGA);
183 drm_panel_attach(imxpd->panel, &imxpd->connector);
185 drm_mode_connector_attach_encoder(&imxpd->connector, &imxpd->encoder);
190 static int imx_pd_bind(struct device *dev, struct device *master, void *data)
192 struct drm_device *drm = data;
193 struct device_node *np = dev->of_node;
194 struct device_node *ep;
196 struct imx_parallel_display *imxpd;
200 imxpd = devm_kzalloc(dev, sizeof(*imxpd), GFP_KERNEL);
204 edidp = of_get_property(np, "edid", &imxpd->edid_len);
206 imxpd->edid = kmemdup(edidp, imxpd->edid_len, GFP_KERNEL);
208 ret = of_property_read_string(np, "interface-pix-fmt", &fmt);
210 if (!strcmp(fmt, "rgb24"))
211 imxpd->bus_format = MEDIA_BUS_FMT_RGB888_1X24;
212 else if (!strcmp(fmt, "rgb565"))
213 imxpd->bus_format = MEDIA_BUS_FMT_RGB565_1X16;
214 else if (!strcmp(fmt, "bgr666"))
215 imxpd->bus_format = MEDIA_BUS_FMT_RGB666_1X18;
216 else if (!strcmp(fmt, "lvds666"))
217 imxpd->bus_format = MEDIA_BUS_FMT_RGB666_1X24_CPADHI;
220 /* port@1 is the output port */
221 ep = of_graph_get_endpoint_by_regs(np, 1, -1);
223 struct device_node *remote;
225 remote = of_graph_get_remote_port_parent(ep);
228 imxpd->panel = of_drm_find_panel(remote);
232 return -EPROBE_DEFER;
237 ret = imx_pd_register(drm, imxpd);
241 dev_set_drvdata(dev, imxpd);
246 static void imx_pd_unbind(struct device *dev, struct device *master,
249 struct imx_parallel_display *imxpd = dev_get_drvdata(dev);
251 imxpd->encoder.funcs->destroy(&imxpd->encoder);
252 imxpd->connector.funcs->destroy(&imxpd->connector);
257 static const struct component_ops imx_pd_ops = {
259 .unbind = imx_pd_unbind,
262 static int imx_pd_probe(struct platform_device *pdev)
264 return component_add(&pdev->dev, &imx_pd_ops);
267 static int imx_pd_remove(struct platform_device *pdev)
269 component_del(&pdev->dev, &imx_pd_ops);
274 static const struct of_device_id imx_pd_dt_ids[] = {
275 { .compatible = "fsl,imx-parallel-display", },
278 MODULE_DEVICE_TABLE(of, imx_pd_dt_ids);
280 static struct platform_driver imx_pd_driver = {
281 .probe = imx_pd_probe,
282 .remove = imx_pd_remove,
284 .of_match_table = imx_pd_dt_ids,
285 .name = "imx-parallel-display",
289 module_platform_driver(imx_pd_driver);
291 MODULE_DESCRIPTION("i.MX parallel display driver");
292 MODULE_AUTHOR("Sascha Hauer, Pengutronix");
293 MODULE_LICENSE("GPL");
294 MODULE_ALIAS("platform:imx-parallel-display");