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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 struct drm_encoder *imx_pd_connector_best_encoder(
92 struct drm_connector *connector)
93{
94 struct imx_parallel_display *imxpd = con_to_imxpd(connector);
95
96 return &imxpd->encoder;
97}
98
99static void imx_pd_bridge_enable(struct drm_bridge *bridge)
100{
101 struct imx_parallel_display *imxpd = bridge_to_imxpd(bridge);
102
103 drm_panel_prepare(imxpd->panel);
104 drm_panel_enable(imxpd->panel);
105}
106
107static void imx_pd_bridge_disable(struct drm_bridge *bridge)
108{
109 struct imx_parallel_display *imxpd = bridge_to_imxpd(bridge);
110
111 drm_panel_disable(imxpd->panel);
112 drm_panel_unprepare(imxpd->panel);
113}
114
115static const u32 imx_pd_bus_fmts[] = {
116 MEDIA_BUS_FMT_RGB888_1X24,
117 MEDIA_BUS_FMT_BGR888_1X24,
118 MEDIA_BUS_FMT_GBR888_1X24,
119 MEDIA_BUS_FMT_RGB666_1X18,
120 MEDIA_BUS_FMT_RGB666_1X24_CPADHI,
121 MEDIA_BUS_FMT_RGB565_1X16,
122};
123
124static u32 *
125imx_pd_bridge_atomic_get_output_bus_fmts(struct drm_bridge *bridge,
126 struct drm_bridge_state *bridge_state,
127 struct drm_crtc_state *crtc_state,
128 struct drm_connector_state *conn_state,
129 unsigned int *num_output_fmts)
130{
131 struct drm_display_info *di = &conn_state->connector->display_info;
132 struct imx_parallel_display *imxpd = bridge_to_imxpd(bridge);
133 u32 *output_fmts;
134
135 if (!imxpd->bus_format && !di->num_bus_formats) {
136 *num_output_fmts = ARRAY_SIZE(imx_pd_bus_fmts);
137 return kmemdup(imx_pd_bus_fmts, sizeof(imx_pd_bus_fmts),
138 GFP_KERNEL);
139 }
140
141 *num_output_fmts = 1;
142 output_fmts = kmalloc(sizeof(*output_fmts), GFP_KERNEL);
143 if (!output_fmts)
144 return NULL;
145
146 if (!imxpd->bus_format && di->num_bus_formats)
147 output_fmts[0] = di->bus_formats[0];
148 else
149 output_fmts[0] = imxpd->bus_format;
150
151 return output_fmts;
152}
153
154static bool imx_pd_format_supported(u32 output_fmt)
155{
156 unsigned int i;
157
158 for (i = 0; i < ARRAY_SIZE(imx_pd_bus_fmts); i++) {
159 if (imx_pd_bus_fmts[i] == output_fmt)
160 return true;
161 }
162
163 return false;
164}
165
166static u32 *
167imx_pd_bridge_atomic_get_input_bus_fmts(struct drm_bridge *bridge,
168 struct drm_bridge_state *bridge_state,
169 struct drm_crtc_state *crtc_state,
170 struct drm_connector_state *conn_state,
171 u32 output_fmt,
172 unsigned int *num_input_fmts)
173{
174 struct imx_parallel_display *imxpd = bridge_to_imxpd(bridge);
175 u32 *input_fmts;
176
177 /*
178 * If the next bridge does not support bus format negotiation, let's
179 * use the static bus format definition (imxpd->bus_format) if it's
180 * specified, RGB888 when it's not.
181 */
182 if (output_fmt == MEDIA_BUS_FMT_FIXED)
183 output_fmt = imxpd->bus_format ? : MEDIA_BUS_FMT_RGB888_1X24;
184
185 /* Now make sure the requested output format is supported. */
186 if ((imxpd->bus_format && imxpd->bus_format != output_fmt) ||
187 !imx_pd_format_supported(output_fmt)) {
188 *num_input_fmts = 0;
189 return NULL;
190 }
191
192 *num_input_fmts = 1;
193 input_fmts = kmalloc(sizeof(*input_fmts), GFP_KERNEL);
194 if (!input_fmts)
195 return NULL;
196
197 input_fmts[0] = output_fmt;
198 return input_fmts;
199}
200
201static int imx_pd_bridge_atomic_check(struct drm_bridge *bridge,
202 struct drm_bridge_state *bridge_state,
203 struct drm_crtc_state *crtc_state,
204 struct drm_connector_state *conn_state)
205{
206 struct imx_crtc_state *imx_crtc_state = to_imx_crtc_state(crtc_state);
207 struct drm_display_info *di = &conn_state->connector->display_info;
208 struct imx_parallel_display *imxpd = bridge_to_imxpd(bridge);
209 struct drm_bridge_state *next_bridge_state = NULL;
210 struct drm_bridge *next_bridge;
211 u32 bus_flags, bus_fmt;
212
213 next_bridge = drm_bridge_get_next_bridge(bridge);
214 if (next_bridge)
215 next_bridge_state = drm_atomic_get_new_bridge_state(crtc_state->state,
216 next_bridge);
217
218 if (next_bridge_state)
219 bus_flags = next_bridge_state->input_bus_cfg.flags;
220 else if (!imxpd->bus_format && di->num_bus_formats)
221 bus_flags = di->bus_flags;
222 else
223 bus_flags = imxpd->bus_flags;
224
225 bus_fmt = bridge_state->input_bus_cfg.format;
226 if (!imx_pd_format_supported(bus_fmt))
227 return -EINVAL;
228
229 if (bus_flags &
230 ~(DRM_BUS_FLAG_DE_LOW | DRM_BUS_FLAG_DE_HIGH |
231 DRM_BUS_FLAG_PIXDATA_DRIVE_POSEDGE |
232 DRM_BUS_FLAG_PIXDATA_DRIVE_NEGEDGE)) {
233 dev_warn(imxpd->dev, "invalid bus_flags (%x)\n", bus_flags);
234 return -EINVAL;
235 }
236
237 bridge_state->output_bus_cfg.flags = bus_flags;
238 bridge_state->input_bus_cfg.flags = bus_flags;
239 imx_crtc_state->bus_flags = bus_flags;
240 imx_crtc_state->bus_format = bridge_state->input_bus_cfg.format;
241 imx_crtc_state->di_hsync_pin = 2;
242 imx_crtc_state->di_vsync_pin = 3;
243
244 return 0;
245}
246
247static const struct drm_connector_funcs imx_pd_connector_funcs = {
248 .fill_modes = drm_helper_probe_single_connector_modes,
249 .destroy = imx_drm_connector_destroy,
250 .reset = drm_atomic_helper_connector_reset,
251 .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
252 .atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
253};
254
255static const struct drm_connector_helper_funcs imx_pd_connector_helper_funcs = {
256 .get_modes = imx_pd_connector_get_modes,
257 .best_encoder = imx_pd_connector_best_encoder,
258};
259
260static const struct drm_bridge_funcs imx_pd_bridge_funcs = {
261 .enable = imx_pd_bridge_enable,
262 .disable = imx_pd_bridge_disable,
263 .atomic_reset = drm_atomic_helper_bridge_reset,
264 .atomic_duplicate_state = drm_atomic_helper_bridge_duplicate_state,
265 .atomic_destroy_state = drm_atomic_helper_bridge_destroy_state,
266 .atomic_check = imx_pd_bridge_atomic_check,
267 .atomic_get_input_bus_fmts = imx_pd_bridge_atomic_get_input_bus_fmts,
268 .atomic_get_output_bus_fmts = imx_pd_bridge_atomic_get_output_bus_fmts,
269};
270
271static int imx_pd_register(struct drm_device *drm,
272 struct imx_parallel_display *imxpd)
273{
274 struct drm_encoder *encoder = &imxpd->encoder;
275 int ret;
276
277 ret = imx_drm_encoder_parse_of(drm, encoder, imxpd->dev->of_node);
278 if (ret)
279 return ret;
280
281 /* set the connector's dpms to OFF so that
282 * drm_helper_connector_dpms() won't return
283 * immediately since the current state is ON
284 * at this point.
285 */
286 imxpd->connector.dpms = DRM_MODE_DPMS_OFF;
287
288 drm_simple_encoder_init(drm, encoder, DRM_MODE_ENCODER_NONE);
289
290 imxpd->bridge.funcs = &imx_pd_bridge_funcs;
291 drm_bridge_attach(encoder, &imxpd->bridge, NULL, 0);
292
293 if (!imxpd->next_bridge) {
294 drm_connector_helper_add(&imxpd->connector,
295 &imx_pd_connector_helper_funcs);
296 drm_connector_init(drm, &imxpd->connector,
297 &imx_pd_connector_funcs,
298 DRM_MODE_CONNECTOR_DPI);
299 }
300
301 if (imxpd->panel)
302 drm_panel_attach(imxpd->panel, &imxpd->connector);
303
304 if (imxpd->next_bridge) {
305 ret = drm_bridge_attach(encoder, imxpd->next_bridge,
306 &imxpd->bridge, 0);
307 if (ret < 0) {
308 dev_err(imxpd->dev, "failed to attach bridge: %d\n",
309 ret);
310 return ret;
311 }
312 } else {
313 drm_connector_attach_encoder(&imxpd->connector, encoder);
314 }
315
316 return 0;
317}
318
319static int imx_pd_bind(struct device *dev, struct device *master, void *data)
320{
321 struct drm_device *drm = data;
322 struct device_node *np = dev->of_node;
323 const u8 *edidp;
324 struct imx_parallel_display *imxpd;
325 int ret;
326 u32 bus_format = 0;
327 const char *fmt;
328
329 imxpd = devm_kzalloc(dev, sizeof(*imxpd), GFP_KERNEL);
330 if (!imxpd)
331 return -ENOMEM;
332
333 edidp = of_get_property(np, "edid", &imxpd->edid_len);
334 if (edidp)
335 imxpd->edid = kmemdup(edidp, imxpd->edid_len, GFP_KERNEL);
336
337 ret = of_property_read_string(np, "interface-pix-fmt", &fmt);
338 if (!ret) {
339 if (!strcmp(fmt, "rgb24"))
340 bus_format = MEDIA_BUS_FMT_RGB888_1X24;
341 else if (!strcmp(fmt, "rgb565"))
342 bus_format = MEDIA_BUS_FMT_RGB565_1X16;
343 else if (!strcmp(fmt, "bgr666"))
344 bus_format = MEDIA_BUS_FMT_RGB666_1X18;
345 else if (!strcmp(fmt, "lvds666"))
346 bus_format = MEDIA_BUS_FMT_RGB666_1X24_CPADHI;
347 }
348 imxpd->bus_format = bus_format;
349
350 /* port@1 is the output port */
351 ret = drm_of_find_panel_or_bridge(np, 1, 0, &imxpd->panel,
352 &imxpd->next_bridge);
353 if (ret && ret != -ENODEV)
354 return ret;
355
356 imxpd->dev = dev;
357
358 ret = imx_pd_register(drm, imxpd);
359 if (ret)
360 return ret;
361
362 dev_set_drvdata(dev, imxpd);
363
364 return 0;
365}
366
367static void imx_pd_unbind(struct device *dev, struct device *master,
368 void *data)
369{
370 struct imx_parallel_display *imxpd = dev_get_drvdata(dev);
371
372 if (imxpd->panel)
373 drm_panel_detach(imxpd->panel);
374
375 kfree(imxpd->edid);
376}
377
378static const struct component_ops imx_pd_ops = {
379 .bind = imx_pd_bind,
380 .unbind = imx_pd_unbind,
381};
382
383static int imx_pd_probe(struct platform_device *pdev)
384{
385 return component_add(&pdev->dev, &imx_pd_ops);
386}
387
388static int imx_pd_remove(struct platform_device *pdev)
389{
390 component_del(&pdev->dev, &imx_pd_ops);
391
392 return 0;
393}
394
395static const struct of_device_id imx_pd_dt_ids[] = {
396 { .compatible = "fsl,imx-parallel-display", },
397 { /* sentinel */ }
398};
399MODULE_DEVICE_TABLE(of, imx_pd_dt_ids);
400
401static struct platform_driver imx_pd_driver = {
402 .probe = imx_pd_probe,
403 .remove = imx_pd_remove,
404 .driver = {
405 .of_match_table = imx_pd_dt_ids,
406 .name = "imx-parallel-display",
407 },
408};
409
410module_platform_driver(imx_pd_driver);
411
412MODULE_DESCRIPTION("i.MX parallel display driver");
413MODULE_AUTHOR("Sascha Hauer, Pengutronix");
414MODULE_LICENSE("GPL");
415MODULE_ALIAS("platform:imx-parallel-display");