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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_bridge.h>
17#include <drm/drm_fb_helper.h>
18#include <drm/drm_managed.h>
19#include <drm/drm_of.h>
20#include <drm/drm_panel.h>
21#include <drm/drm_probe_helper.h>
22#include <drm/drm_simple_kms_helper.h>
23
24#include "imx-drm.h"
25
26struct imx_parallel_display_encoder {
27 struct drm_connector connector;
28 struct drm_encoder encoder;
29 struct drm_bridge bridge;
30 struct imx_parallel_display *pd;
31};
32
33struct imx_parallel_display {
34 struct device *dev;
35 void *edid;
36 u32 bus_format;
37 u32 bus_flags;
38 struct drm_display_mode mode;
39 struct drm_panel *panel;
40 struct drm_bridge *next_bridge;
41};
42
43static inline struct imx_parallel_display *con_to_imxpd(struct drm_connector *c)
44{
45 return container_of(c, struct imx_parallel_display_encoder, connector)->pd;
46}
47
48static inline struct imx_parallel_display *bridge_to_imxpd(struct drm_bridge *b)
49{
50 return container_of(b, struct imx_parallel_display_encoder, bridge)->pd;
51}
52
53static int imx_pd_connector_get_modes(struct drm_connector *connector)
54{
55 struct imx_parallel_display *imxpd = con_to_imxpd(connector);
56 struct device_node *np = imxpd->dev->of_node;
57 int num_modes;
58
59 num_modes = drm_panel_get_modes(imxpd->panel, connector);
60 if (num_modes > 0)
61 return num_modes;
62
63 if (imxpd->edid) {
64 drm_connector_update_edid_property(connector, imxpd->edid);
65 num_modes = drm_add_edid_modes(connector, imxpd->edid);
66 }
67
68 if (np) {
69 struct drm_display_mode *mode = drm_mode_create(connector->dev);
70 int ret;
71
72 if (!mode)
73 return -EINVAL;
74
75 ret = of_get_drm_display_mode(np, &imxpd->mode,
76 &imxpd->bus_flags,
77 OF_USE_NATIVE_MODE);
78 if (ret) {
79 drm_mode_destroy(connector->dev, mode);
80 return ret;
81 }
82
83 drm_mode_copy(mode, &imxpd->mode);
84 mode->type |= DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED;
85 drm_mode_probed_add(connector, mode);
86 num_modes++;
87 }
88
89 return num_modes;
90}
91
92static void imx_pd_bridge_enable(struct drm_bridge *bridge)
93{
94 struct imx_parallel_display *imxpd = bridge_to_imxpd(bridge);
95
96 drm_panel_prepare(imxpd->panel);
97 drm_panel_enable(imxpd->panel);
98}
99
100static void imx_pd_bridge_disable(struct drm_bridge *bridge)
101{
102 struct imx_parallel_display *imxpd = bridge_to_imxpd(bridge);
103
104 drm_panel_disable(imxpd->panel);
105 drm_panel_unprepare(imxpd->panel);
106}
107
108static const u32 imx_pd_bus_fmts[] = {
109 MEDIA_BUS_FMT_RGB888_1X24,
110 MEDIA_BUS_FMT_BGR888_1X24,
111 MEDIA_BUS_FMT_GBR888_1X24,
112 MEDIA_BUS_FMT_RGB666_1X18,
113 MEDIA_BUS_FMT_RGB666_1X24_CPADHI,
114 MEDIA_BUS_FMT_RGB565_1X16,
115};
116
117static u32 *
118imx_pd_bridge_atomic_get_output_bus_fmts(struct drm_bridge *bridge,
119 struct drm_bridge_state *bridge_state,
120 struct drm_crtc_state *crtc_state,
121 struct drm_connector_state *conn_state,
122 unsigned int *num_output_fmts)
123{
124 struct drm_display_info *di = &conn_state->connector->display_info;
125 struct imx_parallel_display *imxpd = bridge_to_imxpd(bridge);
126 u32 *output_fmts;
127
128 if (!imxpd->bus_format && !di->num_bus_formats) {
129 *num_output_fmts = ARRAY_SIZE(imx_pd_bus_fmts);
130 return kmemdup(imx_pd_bus_fmts, sizeof(imx_pd_bus_fmts),
131 GFP_KERNEL);
132 }
133
134 *num_output_fmts = 1;
135 output_fmts = kmalloc(sizeof(*output_fmts), GFP_KERNEL);
136 if (!output_fmts)
137 return NULL;
138
139 if (!imxpd->bus_format && di->num_bus_formats)
140 output_fmts[0] = di->bus_formats[0];
141 else
142 output_fmts[0] = imxpd->bus_format;
143
144 return output_fmts;
145}
146
147static bool imx_pd_format_supported(u32 output_fmt)
148{
149 unsigned int i;
150
151 for (i = 0; i < ARRAY_SIZE(imx_pd_bus_fmts); i++) {
152 if (imx_pd_bus_fmts[i] == output_fmt)
153 return true;
154 }
155
156 return false;
157}
158
159static u32 *
160imx_pd_bridge_atomic_get_input_bus_fmts(struct drm_bridge *bridge,
161 struct drm_bridge_state *bridge_state,
162 struct drm_crtc_state *crtc_state,
163 struct drm_connector_state *conn_state,
164 u32 output_fmt,
165 unsigned int *num_input_fmts)
166{
167 struct imx_parallel_display *imxpd = bridge_to_imxpd(bridge);
168 u32 *input_fmts;
169
170
171
172
173
174
175 if (output_fmt == MEDIA_BUS_FMT_FIXED)
176 output_fmt = imxpd->bus_format ? : MEDIA_BUS_FMT_RGB888_1X24;
177
178
179 if ((imxpd->bus_format && imxpd->bus_format != output_fmt) ||
180 !imx_pd_format_supported(output_fmt)) {
181 *num_input_fmts = 0;
182 return NULL;
183 }
184
185 *num_input_fmts = 1;
186 input_fmts = kmalloc(sizeof(*input_fmts), GFP_KERNEL);
187 if (!input_fmts)
188 return NULL;
189
190 input_fmts[0] = output_fmt;
191 return input_fmts;
192}
193
194static int imx_pd_bridge_atomic_check(struct drm_bridge *bridge,
195 struct drm_bridge_state *bridge_state,
196 struct drm_crtc_state *crtc_state,
197 struct drm_connector_state *conn_state)
198{
199 struct imx_crtc_state *imx_crtc_state = to_imx_crtc_state(crtc_state);
200 struct drm_display_info *di = &conn_state->connector->display_info;
201 struct imx_parallel_display *imxpd = bridge_to_imxpd(bridge);
202 struct drm_bridge_state *next_bridge_state = NULL;
203 struct drm_bridge *next_bridge;
204 u32 bus_flags, bus_fmt;
205
206 next_bridge = drm_bridge_get_next_bridge(bridge);
207 if (next_bridge)
208 next_bridge_state = drm_atomic_get_new_bridge_state(crtc_state->state,
209 next_bridge);
210
211 if (next_bridge_state)
212 bus_flags = next_bridge_state->input_bus_cfg.flags;
213 else if (di->num_bus_formats)
214 bus_flags = di->bus_flags;
215 else
216 bus_flags = imxpd->bus_flags;
217
218 bus_fmt = bridge_state->input_bus_cfg.format;
219 if (!imx_pd_format_supported(bus_fmt))
220 return -EINVAL;
221
222 bridge_state->output_bus_cfg.flags = bus_flags;
223 bridge_state->input_bus_cfg.flags = bus_flags;
224 imx_crtc_state->bus_flags = bus_flags;
225 imx_crtc_state->bus_format = bridge_state->input_bus_cfg.format;
226 imx_crtc_state->di_hsync_pin = 2;
227 imx_crtc_state->di_vsync_pin = 3;
228
229 return 0;
230}
231
232static const struct drm_connector_funcs imx_pd_connector_funcs = {
233 .fill_modes = drm_helper_probe_single_connector_modes,
234 .destroy = imx_drm_connector_destroy,
235 .reset = drm_atomic_helper_connector_reset,
236 .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
237 .atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
238};
239
240static const struct drm_connector_helper_funcs imx_pd_connector_helper_funcs = {
241 .get_modes = imx_pd_connector_get_modes,
242};
243
244static const struct drm_bridge_funcs imx_pd_bridge_funcs = {
245 .enable = imx_pd_bridge_enable,
246 .disable = imx_pd_bridge_disable,
247 .atomic_reset = drm_atomic_helper_bridge_reset,
248 .atomic_duplicate_state = drm_atomic_helper_bridge_duplicate_state,
249 .atomic_destroy_state = drm_atomic_helper_bridge_destroy_state,
250 .atomic_check = imx_pd_bridge_atomic_check,
251 .atomic_get_input_bus_fmts = imx_pd_bridge_atomic_get_input_bus_fmts,
252 .atomic_get_output_bus_fmts = imx_pd_bridge_atomic_get_output_bus_fmts,
253};
254
255static int imx_pd_bind(struct device *dev, struct device *master, void *data)
256{
257 struct drm_device *drm = data;
258 struct imx_parallel_display *imxpd = dev_get_drvdata(dev);
259 struct imx_parallel_display_encoder *imxpd_encoder;
260 struct drm_connector *connector;
261 struct drm_encoder *encoder;
262 struct drm_bridge *bridge;
263 int ret;
264
265 imxpd_encoder = drmm_simple_encoder_alloc(drm, struct imx_parallel_display_encoder,
266 encoder, DRM_MODE_ENCODER_NONE);
267 if (IS_ERR(imxpd_encoder))
268 return PTR_ERR(imxpd_encoder);
269
270 imxpd_encoder->pd = imxpd;
271 connector = &imxpd_encoder->connector;
272 encoder = &imxpd_encoder->encoder;
273 bridge = &imxpd_encoder->bridge;
274
275 ret = imx_drm_encoder_parse_of(drm, encoder, imxpd->dev->of_node);
276 if (ret)
277 return ret;
278
279
280
281
282
283
284 connector->dpms = DRM_MODE_DPMS_OFF;
285
286 bridge->funcs = &imx_pd_bridge_funcs;
287 drm_bridge_attach(encoder, bridge, NULL, 0);
288
289 if (imxpd->next_bridge) {
290 ret = drm_bridge_attach(encoder, imxpd->next_bridge, bridge, 0);
291 if (ret < 0)
292 return ret;
293 } else {
294 drm_connector_helper_add(connector,
295 &imx_pd_connector_helper_funcs);
296 drm_connector_init(drm, connector, &imx_pd_connector_funcs,
297 DRM_MODE_CONNECTOR_DPI);
298
299 drm_connector_attach_encoder(connector, encoder);
300 }
301
302 return 0;
303}
304
305static const struct component_ops imx_pd_ops = {
306 .bind = imx_pd_bind,
307};
308
309static int imx_pd_probe(struct platform_device *pdev)
310{
311 struct device *dev = &pdev->dev;
312 struct device_node *np = dev->of_node;
313 const u8 *edidp;
314 struct imx_parallel_display *imxpd;
315 int edid_len;
316 int ret;
317 u32 bus_format = 0;
318 const char *fmt;
319
320 imxpd = devm_kzalloc(dev, sizeof(*imxpd), GFP_KERNEL);
321 if (!imxpd)
322 return -ENOMEM;
323
324
325 ret = drm_of_find_panel_or_bridge(np, 1, 0, &imxpd->panel,
326 &imxpd->next_bridge);
327 if (ret && ret != -ENODEV)
328 return ret;
329
330 edidp = of_get_property(np, "edid", &edid_len);
331 if (edidp)
332 imxpd->edid = devm_kmemdup(dev, edidp, edid_len, GFP_KERNEL);
333
334 ret = of_property_read_string(np, "interface-pix-fmt", &fmt);
335 if (!ret) {
336 if (!strcmp(fmt, "rgb24"))
337 bus_format = MEDIA_BUS_FMT_RGB888_1X24;
338 else if (!strcmp(fmt, "rgb565"))
339 bus_format = MEDIA_BUS_FMT_RGB565_1X16;
340 else if (!strcmp(fmt, "bgr666"))
341 bus_format = MEDIA_BUS_FMT_RGB666_1X18;
342 else if (!strcmp(fmt, "lvds666"))
343 bus_format = MEDIA_BUS_FMT_RGB666_1X24_CPADHI;
344 }
345 imxpd->bus_format = bus_format;
346
347 imxpd->dev = dev;
348
349 platform_set_drvdata(pdev, imxpd);
350
351 return component_add(dev, &imx_pd_ops);
352}
353
354static int imx_pd_remove(struct platform_device *pdev)
355{
356 component_del(&pdev->dev, &imx_pd_ops);
357
358 return 0;
359}
360
361static const struct of_device_id imx_pd_dt_ids[] = {
362 { .compatible = "fsl,imx-parallel-display", },
363 { }
364};
365MODULE_DEVICE_TABLE(of, imx_pd_dt_ids);
366
367static struct platform_driver imx_pd_driver = {
368 .probe = imx_pd_probe,
369 .remove = imx_pd_remove,
370 .driver = {
371 .of_match_table = imx_pd_dt_ids,
372 .name = "imx-parallel-display",
373 },
374};
375
376module_platform_driver(imx_pd_driver);
377
378MODULE_DESCRIPTION("i.MX parallel display driver");
379MODULE_AUTHOR("Sascha Hauer, Pengutronix");
380MODULE_LICENSE("GPL");
381MODULE_ALIAS("platform:imx-parallel-display");
382
