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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_bridge.h>
17#include <drm/drm_fb_helper.h>
18#include <drm/drm_of.h>
19#include <drm/drm_panel.h>
20#include <drm/drm_probe_helper.h>
21#include <drm/drm_simple_kms_helper.h>
22
23#include "imx-drm.h"
24
25struct imx_parallel_display {
26 struct drm_connector connector;
27 struct drm_encoder encoder;
28 struct drm_bridge bridge;
29 struct device *dev;
30 void *edid;
31 int edid_len;
32 u32 bus_format;
33 u32 bus_flags;
34 struct drm_display_mode mode;
35 struct drm_panel *panel;
36 struct drm_bridge *next_bridge;
37};
38
39static inline struct imx_parallel_display *con_to_imxpd(struct drm_connector *c)
40{
41 return container_of(c, struct imx_parallel_display, connector);
42}
43
44static inline struct imx_parallel_display *enc_to_imxpd(struct drm_encoder *e)
45{
46 return container_of(e, struct imx_parallel_display, encoder);
47}
48
49static inline struct imx_parallel_display *bridge_to_imxpd(struct drm_bridge *b)
50{
51 return container_of(b, struct imx_parallel_display, bridge);
52}
53
54static int imx_pd_connector_get_modes(struct drm_connector *connector)
55{
56 struct imx_parallel_display *imxpd = con_to_imxpd(connector);
57 struct device_node *np = imxpd->dev->of_node;
58 int num_modes;
59
60 num_modes = drm_panel_get_modes(imxpd->panel, connector);
61 if (num_modes > 0)
62 return num_modes;
63
64 if (imxpd->edid) {
65 drm_connector_update_edid_property(connector, imxpd->edid);
66 num_modes = drm_add_edid_modes(connector, imxpd->edid);
67 }
68
69 if (np) {
70 struct drm_display_mode *mode = drm_mode_create(connector->dev);
71 int ret;
72
73 if (!mode)
74 return -EINVAL;
75
76 ret = of_get_drm_display_mode(np, &imxpd->mode,
77 &imxpd->bus_flags,
78 OF_USE_NATIVE_MODE);
79 if (ret)
80 return ret;
81
82 drm_mode_copy(mode, &imxpd->mode);
83 mode->type |= DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED,
84 drm_mode_probed_add(connector, mode);
85 num_modes++;
86 }
87
88 return num_modes;
89}
90
91static void imx_pd_bridge_enable(struct drm_bridge *bridge)
92{
93 struct imx_parallel_display *imxpd = bridge_to_imxpd(bridge);
94
95 drm_panel_prepare(imxpd->panel);
96 drm_panel_enable(imxpd->panel);
97}
98
99static void imx_pd_bridge_disable(struct drm_bridge *bridge)
100{
101 struct imx_parallel_display *imxpd = bridge_to_imxpd(bridge);
102
103 drm_panel_disable(imxpd->panel);
104 drm_panel_unprepare(imxpd->panel);
105}
106
107static const u32 imx_pd_bus_fmts[] = {
108 MEDIA_BUS_FMT_RGB888_1X24,
109 MEDIA_BUS_FMT_BGR888_1X24,
110 MEDIA_BUS_FMT_GBR888_1X24,
111 MEDIA_BUS_FMT_RGB666_1X18,
112 MEDIA_BUS_FMT_RGB666_1X24_CPADHI,
113 MEDIA_BUS_FMT_RGB565_1X16,
114};
115
116static u32 *
117imx_pd_bridge_atomic_get_output_bus_fmts(struct drm_bridge *bridge,
118 struct drm_bridge_state *bridge_state,
119 struct drm_crtc_state *crtc_state,
120 struct drm_connector_state *conn_state,
121 unsigned int *num_output_fmts)
122{
123 struct drm_display_info *di = &conn_state->connector->display_info;
124 struct imx_parallel_display *imxpd = bridge_to_imxpd(bridge);
125 u32 *output_fmts;
126
127 if (!imxpd->bus_format && !di->num_bus_formats) {
128 *num_output_fmts = ARRAY_SIZE(imx_pd_bus_fmts);
129 return kmemdup(imx_pd_bus_fmts, sizeof(imx_pd_bus_fmts),
130 GFP_KERNEL);
131 }
132
133 *num_output_fmts = 1;
134 output_fmts = kmalloc(sizeof(*output_fmts), GFP_KERNEL);
135 if (!output_fmts)
136 return NULL;
137
138 if (!imxpd->bus_format && di->num_bus_formats)
139 output_fmts[0] = di->bus_formats[0];
140 else
141 output_fmts[0] = imxpd->bus_format;
142
143 return output_fmts;
144}
145
146static bool imx_pd_format_supported(u32 output_fmt)
147{
148 unsigned int i;
149
150 for (i = 0; i < ARRAY_SIZE(imx_pd_bus_fmts); i++) {
151 if (imx_pd_bus_fmts[i] == output_fmt)
152 return true;
153 }
154
155 return false;
156}
157
158static u32 *
159imx_pd_bridge_atomic_get_input_bus_fmts(struct drm_bridge *bridge,
160 struct drm_bridge_state *bridge_state,
161 struct drm_crtc_state *crtc_state,
162 struct drm_connector_state *conn_state,
163 u32 output_fmt,
164 unsigned int *num_input_fmts)
165{
166 struct imx_parallel_display *imxpd = bridge_to_imxpd(bridge);
167 u32 *input_fmts;
168
169 /*
170 * If the next bridge does not support bus format negotiation, let's
171 * use the static bus format definition (imxpd->bus_format) if it's
172 * specified, RGB888 when it's not.
173 */
174 if (output_fmt == MEDIA_BUS_FMT_FIXED)
175 output_fmt = imxpd->bus_format ? : MEDIA_BUS_FMT_RGB888_1X24;
176
177 /* Now make sure the requested output format is supported. */
178 if ((imxpd->bus_format && imxpd->bus_format != output_fmt) ||
179 !imx_pd_format_supported(output_fmt)) {
180 *num_input_fmts = 0;
181 return NULL;
182 }
183
184 *num_input_fmts = 1;
185 input_fmts = kmalloc(sizeof(*input_fmts), GFP_KERNEL);
186 if (!input_fmts)
187 return NULL;
188
189 input_fmts[0] = output_fmt;
190 return input_fmts;
191}
192
193static int imx_pd_bridge_atomic_check(struct drm_bridge *bridge,
194 struct drm_bridge_state *bridge_state,
195 struct drm_crtc_state *crtc_state,
196 struct drm_connector_state *conn_state)
197{
198 struct imx_crtc_state *imx_crtc_state = to_imx_crtc_state(crtc_state);
199 struct drm_display_info *di = &conn_state->connector->display_info;
200 struct imx_parallel_display *imxpd = bridge_to_imxpd(bridge);
201 struct drm_bridge_state *next_bridge_state = NULL;
202 struct drm_bridge *next_bridge;
203 u32 bus_flags, bus_fmt;
204
205 next_bridge = drm_bridge_get_next_bridge(bridge);
206 if (next_bridge)
207 next_bridge_state = drm_atomic_get_new_bridge_state(crtc_state->state,
208 next_bridge);
209
210 if (next_bridge_state)
211 bus_flags = next_bridge_state->input_bus_cfg.flags;
212 else if (di->num_bus_formats)
213 bus_flags = di->bus_flags;
214 else
215 bus_flags = imxpd->bus_flags;
216
217 bus_fmt = bridge_state->input_bus_cfg.format;
218 if (!imx_pd_format_supported(bus_fmt))
219 return -EINVAL;
220
221 if (bus_flags &
222 ~(DRM_BUS_FLAG_DE_LOW | DRM_BUS_FLAG_DE_HIGH |
223 DRM_BUS_FLAG_PIXDATA_DRIVE_POSEDGE |
224 DRM_BUS_FLAG_PIXDATA_DRIVE_NEGEDGE)) {
225 dev_warn(imxpd->dev, "invalid bus_flags (%x)\n", bus_flags);
226 return -EINVAL;
227 }
228
229 bridge_state->output_bus_cfg.flags = bus_flags;
230 bridge_state->input_bus_cfg.flags = bus_flags;
231 imx_crtc_state->bus_flags = bus_flags;
232 imx_crtc_state->bus_format = bridge_state->input_bus_cfg.format;
233 imx_crtc_state->di_hsync_pin = 2;
234 imx_crtc_state->di_vsync_pin = 3;
235
236 return 0;
237}
238
239static const struct drm_connector_funcs imx_pd_connector_funcs = {
240 .fill_modes = drm_helper_probe_single_connector_modes,
241 .destroy = imx_drm_connector_destroy,
242 .reset = drm_atomic_helper_connector_reset,
243 .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
244 .atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
245};
246
247static const struct drm_connector_helper_funcs imx_pd_connector_helper_funcs = {
248 .get_modes = imx_pd_connector_get_modes,
249};
250
251static const struct drm_bridge_funcs imx_pd_bridge_funcs = {
252 .enable = imx_pd_bridge_enable,
253 .disable = imx_pd_bridge_disable,
254 .atomic_reset = drm_atomic_helper_bridge_reset,
255 .atomic_duplicate_state = drm_atomic_helper_bridge_duplicate_state,
256 .atomic_destroy_state = drm_atomic_helper_bridge_destroy_state,
257 .atomic_check = imx_pd_bridge_atomic_check,
258 .atomic_get_input_bus_fmts = imx_pd_bridge_atomic_get_input_bus_fmts,
259 .atomic_get_output_bus_fmts = imx_pd_bridge_atomic_get_output_bus_fmts,
260};
261
262static int imx_pd_register(struct drm_device *drm,
263 struct imx_parallel_display *imxpd)
264{
265 struct drm_encoder *encoder = &imxpd->encoder;
266 int ret;
267
268 ret = imx_drm_encoder_parse_of(drm, encoder, imxpd->dev->of_node);
269 if (ret)
270 return ret;
271
272 /* set the connector's dpms to OFF so that
273 * drm_helper_connector_dpms() won't return
274 * immediately since the current state is ON
275 * at this point.
276 */
277 imxpd->connector.dpms = DRM_MODE_DPMS_OFF;
278
279 drm_simple_encoder_init(drm, encoder, DRM_MODE_ENCODER_NONE);
280
281 imxpd->bridge.funcs = &imx_pd_bridge_funcs;
282 drm_bridge_attach(encoder, &imxpd->bridge, NULL, 0);
283
284 if (!imxpd->next_bridge) {
285 drm_connector_helper_add(&imxpd->connector,
286 &imx_pd_connector_helper_funcs);
287 drm_connector_init(drm, &imxpd->connector,
288 &imx_pd_connector_funcs,
289 DRM_MODE_CONNECTOR_DPI);
290 }
291
292 if (imxpd->panel)
293 drm_panel_attach(imxpd->panel, &imxpd->connector);
294
295 if (imxpd->next_bridge) {
296 ret = drm_bridge_attach(encoder, imxpd->next_bridge,
297 &imxpd->bridge, 0);
298 if (ret < 0) {
299 dev_err(imxpd->dev, "failed to attach bridge: %d\n",
300 ret);
301 return ret;
302 }
303 } else {
304 drm_connector_attach_encoder(&imxpd->connector, encoder);
305 }
306
307 return 0;
308}
309
310static int imx_pd_bind(struct device *dev, struct device *master, void *data)
311{
312 struct drm_device *drm = data;
313 struct device_node *np = dev->of_node;
314 const u8 *edidp;
315 struct imx_parallel_display *imxpd;
316 int ret;
317 u32 bus_format = 0;
318 const char *fmt;
319
320 imxpd = dev_get_drvdata(dev);
321 memset(imxpd, 0, sizeof(*imxpd));
322
323 /* port@1 is the output port */
324 ret = drm_of_find_panel_or_bridge(np, 1, 0, &imxpd->panel,
325 &imxpd->next_bridge);
326 if (ret && ret != -ENODEV)
327 return ret;
328
329 edidp = of_get_property(np, "edid", &imxpd->edid_len);
330 if (edidp)
331 imxpd->edid = kmemdup(edidp, imxpd->edid_len, GFP_KERNEL);
332
333 ret = of_property_read_string(np, "interface-pix-fmt", &fmt);
334 if (!ret) {
335 if (!strcmp(fmt, "rgb24"))
336 bus_format = MEDIA_BUS_FMT_RGB888_1X24;
337 else if (!strcmp(fmt, "rgb565"))
338 bus_format = MEDIA_BUS_FMT_RGB565_1X16;
339 else if (!strcmp(fmt, "bgr666"))
340 bus_format = MEDIA_BUS_FMT_RGB666_1X18;
341 else if (!strcmp(fmt, "lvds666"))
342 bus_format = MEDIA_BUS_FMT_RGB666_1X24_CPADHI;
343 }
344 imxpd->bus_format = bus_format;
345
346 imxpd->dev = dev;
347
348 ret = imx_pd_register(drm, imxpd);
349 if (ret)
350 return ret;
351
352 return 0;
353}
354
355static void imx_pd_unbind(struct device *dev, struct device *master,
356 void *data)
357{
358 struct imx_parallel_display *imxpd = dev_get_drvdata(dev);
359
360 if (imxpd->panel)
361 drm_panel_detach(imxpd->panel);
362
363 kfree(imxpd->edid);
364}
365
366static const struct component_ops imx_pd_ops = {
367 .bind = imx_pd_bind,
368 .unbind = imx_pd_unbind,
369};
370
371static int imx_pd_probe(struct platform_device *pdev)
372{
373 struct imx_parallel_display *imxpd;
374
375 imxpd = devm_kzalloc(&pdev->dev, sizeof(*imxpd), GFP_KERNEL);
376 if (!imxpd)
377 return -ENOMEM;
378
379 platform_set_drvdata(pdev, imxpd);
380
381 return component_add(&pdev->dev, &imx_pd_ops);
382}
383
384static int imx_pd_remove(struct platform_device *pdev)
385{
386 component_del(&pdev->dev, &imx_pd_ops);
387
388 return 0;
389}
390
391static const struct of_device_id imx_pd_dt_ids[] = {
392 { .compatible = "fsl,imx-parallel-display", },
393 { /* sentinel */ }
394};
395MODULE_DEVICE_TABLE(of, imx_pd_dt_ids);
396
397static struct platform_driver imx_pd_driver = {
398 .probe = imx_pd_probe,
399 .remove = imx_pd_remove,
400 .driver = {
401 .of_match_table = imx_pd_dt_ids,
402 .name = "imx-parallel-display",
403 },
404};
405
406module_platform_driver(imx_pd_driver);
407
408MODULE_DESCRIPTION("i.MX parallel display driver");
409MODULE_AUTHOR("Sascha Hauer, Pengutronix");
410MODULE_LICENSE("GPL");
411MODULE_ALIAS("platform:imx-parallel-display");