1 // SPDX-License-Identifier: GPL-2.0+
3 * i.MX drm driver - parallel display implementation
5 * Copyright (C) 2012 Sascha Hauer, Pengutronix
8 #include <linux/component.h>
9 #include <linux/module.h>
10 #include <linux/platform_device.h>
11 #include <linux/videodev2.h>
13 #include <video/of_display_timing.h>
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>
23 struct imx_parallel_display {
24 struct drm_connector connector;
25 struct drm_encoder encoder;
31 struct drm_display_mode mode;
32 struct drm_panel *panel;
33 struct drm_bridge *bridge;
36 static inline struct imx_parallel_display *con_to_imxpd(struct drm_connector *c)
38 return container_of(c, struct imx_parallel_display, connector);
41 static inline struct imx_parallel_display *enc_to_imxpd(struct drm_encoder *e)
43 return container_of(e, struct imx_parallel_display, encoder);
46 static int imx_pd_connector_get_modes(struct drm_connector *connector)
48 struct imx_parallel_display *imxpd = con_to_imxpd(connector);
49 struct device_node *np = imxpd->dev->of_node;
52 if (imxpd->panel && imxpd->panel->funcs &&
53 imxpd->panel->funcs->get_modes) {
54 num_modes = imxpd->panel->funcs->get_modes(imxpd->panel);
60 drm_connector_update_edid_property(connector, imxpd->edid);
61 num_modes = drm_add_edid_modes(connector, imxpd->edid);
65 struct drm_display_mode *mode = drm_mode_create(connector->dev);
71 ret = of_get_drm_display_mode(np, &imxpd->mode,
77 drm_mode_copy(mode, &imxpd->mode);
78 mode->type |= DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED,
79 drm_mode_probed_add(connector, mode);
86 static struct drm_encoder *imx_pd_connector_best_encoder(
87 struct drm_connector *connector)
89 struct imx_parallel_display *imxpd = con_to_imxpd(connector);
91 return &imxpd->encoder;
94 static void imx_pd_encoder_enable(struct drm_encoder *encoder)
96 struct imx_parallel_display *imxpd = enc_to_imxpd(encoder);
98 drm_panel_prepare(imxpd->panel);
99 drm_panel_enable(imxpd->panel);
102 static void imx_pd_encoder_disable(struct drm_encoder *encoder)
104 struct imx_parallel_display *imxpd = enc_to_imxpd(encoder);
106 drm_panel_disable(imxpd->panel);
107 drm_panel_unprepare(imxpd->panel);
110 static int imx_pd_encoder_atomic_check(struct drm_encoder *encoder,
111 struct drm_crtc_state *crtc_state,
112 struct drm_connector_state *conn_state)
114 struct imx_crtc_state *imx_crtc_state = to_imx_crtc_state(crtc_state);
115 struct drm_display_info *di = &conn_state->connector->display_info;
116 struct imx_parallel_display *imxpd = enc_to_imxpd(encoder);
118 if (!imxpd->bus_format && di->num_bus_formats) {
119 imx_crtc_state->bus_flags = di->bus_flags;
120 imx_crtc_state->bus_format = di->bus_formats[0];
122 imx_crtc_state->bus_flags = imxpd->bus_flags;
123 imx_crtc_state->bus_format = imxpd->bus_format;
125 imx_crtc_state->di_hsync_pin = 2;
126 imx_crtc_state->di_vsync_pin = 3;
131 static const struct drm_connector_funcs imx_pd_connector_funcs = {
132 .fill_modes = drm_helper_probe_single_connector_modes,
133 .destroy = imx_drm_connector_destroy,
134 .reset = drm_atomic_helper_connector_reset,
135 .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
136 .atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
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 .enable = imx_pd_encoder_enable,
150 .disable = imx_pd_encoder_disable,
151 .atomic_check = imx_pd_encoder_atomic_check,
154 static int imx_pd_register(struct drm_device *drm,
155 struct imx_parallel_display *imxpd)
157 struct drm_encoder *encoder = &imxpd->encoder;
160 ret = imx_drm_encoder_parse_of(drm, encoder, imxpd->dev->of_node);
164 /* set the connector's dpms to OFF so that
165 * drm_helper_connector_dpms() won't return
166 * immediately since the current state is ON
169 imxpd->connector.dpms = DRM_MODE_DPMS_OFF;
171 drm_encoder_helper_add(encoder, &imx_pd_encoder_helper_funcs);
172 drm_encoder_init(drm, encoder, &imx_pd_encoder_funcs,
173 DRM_MODE_ENCODER_NONE, NULL);
175 if (!imxpd->bridge) {
176 drm_connector_helper_add(&imxpd->connector,
177 &imx_pd_connector_helper_funcs);
178 drm_connector_init(drm, &imxpd->connector,
179 &imx_pd_connector_funcs,
180 DRM_MODE_CONNECTOR_DPI);
184 drm_panel_attach(imxpd->panel, &imxpd->connector);
187 ret = drm_bridge_attach(encoder, imxpd->bridge, NULL);
189 dev_err(imxpd->dev, "failed to attach bridge: %d\n",
194 drm_connector_attach_encoder(&imxpd->connector, encoder);
200 static int imx_pd_bind(struct device *dev, struct device *master, void *data)
202 struct drm_device *drm = data;
203 struct device_node *np = dev->of_node;
205 struct imx_parallel_display *imxpd;
210 imxpd = devm_kzalloc(dev, sizeof(*imxpd), GFP_KERNEL);
214 edidp = of_get_property(np, "edid", &imxpd->edid_len);
216 imxpd->edid = kmemdup(edidp, imxpd->edid_len, GFP_KERNEL);
218 ret = of_property_read_string(np, "interface-pix-fmt", &fmt);
220 if (!strcmp(fmt, "rgb24"))
221 bus_format = MEDIA_BUS_FMT_RGB888_1X24;
222 else if (!strcmp(fmt, "rgb565"))
223 bus_format = MEDIA_BUS_FMT_RGB565_1X16;
224 else if (!strcmp(fmt, "bgr666"))
225 bus_format = MEDIA_BUS_FMT_RGB666_1X18;
226 else if (!strcmp(fmt, "lvds666"))
227 bus_format = MEDIA_BUS_FMT_RGB666_1X24_CPADHI;
229 imxpd->bus_format = bus_format;
231 /* port@1 is the output port */
232 ret = drm_of_find_panel_or_bridge(np, 1, 0, &imxpd->panel, &imxpd->bridge);
233 if (ret && ret != -ENODEV)
238 ret = imx_pd_register(drm, imxpd);
242 dev_set_drvdata(dev, imxpd);
247 static void imx_pd_unbind(struct device *dev, struct device *master,
250 struct imx_parallel_display *imxpd = dev_get_drvdata(dev);
253 drm_panel_detach(imxpd->panel);
258 static const struct component_ops imx_pd_ops = {
260 .unbind = imx_pd_unbind,
263 static int imx_pd_probe(struct platform_device *pdev)
265 return component_add(&pdev->dev, &imx_pd_ops);
268 static int imx_pd_remove(struct platform_device *pdev)
270 component_del(&pdev->dev, &imx_pd_ops);
275 static const struct of_device_id imx_pd_dt_ids[] = {
276 { .compatible = "fsl,imx-parallel-display", },
279 MODULE_DEVICE_TABLE(of, imx_pd_dt_ids);
281 static struct platform_driver imx_pd_driver = {
282 .probe = imx_pd_probe,
283 .remove = imx_pd_remove,
285 .of_match_table = imx_pd_dt_ids,
286 .name = "imx-parallel-display",
290 module_platform_driver(imx_pd_driver);
292 MODULE_DESCRIPTION("i.MX parallel display driver");
293 MODULE_AUTHOR("Sascha Hauer, Pengutronix");
294 MODULE_LICENSE("GPL");
295 MODULE_ALIAS("platform:imx-parallel-display");