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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/media-bus-format.h>
10#include <linux/module.h>
11#include <linux/of.h>
12#include <linux/platform_device.h>
13#include <linux/videodev2.h>
14
15#include <video/of_display_timing.h>
16
17#include <drm/drm_atomic_helper.h>
18#include <drm/drm_bridge.h>
19#include <drm/drm_edid.h>
20#include <drm/drm_managed.h>
21#include <drm/drm_of.h>
22#include <drm/drm_panel.h>
23#include <drm/drm_probe_helper.h>
24#include <drm/drm_simple_kms_helper.h>
25
26#include "imx-drm.h"
27
28struct imx_parallel_display_encoder {
29 struct drm_connector connector;
30 struct drm_encoder encoder;
31 struct drm_bridge bridge;
32 struct imx_parallel_display *pd;
33};
34
35struct imx_parallel_display {
36 struct device *dev;
37 void *edid;
38 u32 bus_format;
39 u32 bus_flags;
40 struct drm_display_mode mode;
41 struct drm_panel *panel;
42 struct drm_bridge *next_bridge;
43};
44
45static inline struct imx_parallel_display *con_to_imxpd(struct drm_connector *c)
46{
47 return container_of(c, struct imx_parallel_display_encoder, connector)->pd;
48}
49
50static inline struct imx_parallel_display *bridge_to_imxpd(struct drm_bridge *b)
51{
52 return container_of(b, struct imx_parallel_display_encoder, bridge)->pd;
53}
54
55static int imx_pd_connector_get_modes(struct drm_connector *connector)
56{
57 struct imx_parallel_display *imxpd = con_to_imxpd(connector);
58 struct device_node *np = imxpd->dev->of_node;
59 int num_modes;
60
61 num_modes = drm_panel_get_modes(imxpd->panel, connector);
62 if (num_modes > 0)
63 return num_modes;
64
65 if (imxpd->edid) {
66 drm_connector_update_edid_property(connector, imxpd->edid);
67 num_modes = drm_add_edid_modes(connector, imxpd->edid);
68 }
69
70 if (np) {
71 struct drm_display_mode *mode = drm_mode_create(connector->dev);
72 int ret;
73
74 if (!mode)
75 return -EINVAL;
76
77 ret = of_get_drm_display_mode(np, &imxpd->mode,
78 &imxpd->bus_flags,
79 OF_USE_NATIVE_MODE);
80 if (ret) {
81 drm_mode_destroy(connector->dev, mode);
82 return ret;
83 }
84
85 drm_mode_copy(mode, &imxpd->mode);
86 mode->type |= DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED;
87 drm_mode_probed_add(connector, mode);
88 num_modes++;
89 }
90
91 return num_modes;
92}
93
94static void imx_pd_bridge_enable(struct drm_bridge *bridge)
95{
96 struct imx_parallel_display *imxpd = bridge_to_imxpd(bridge);
97
98 drm_panel_prepare(imxpd->panel);
99 drm_panel_enable(imxpd->panel);
100}
101
102static void imx_pd_bridge_disable(struct drm_bridge *bridge)
103{
104 struct imx_parallel_display *imxpd = bridge_to_imxpd(bridge);
105
106 drm_panel_disable(imxpd->panel);
107 drm_panel_unprepare(imxpd->panel);
108}
109
110static const u32 imx_pd_bus_fmts[] = {
111 MEDIA_BUS_FMT_RGB888_1X24,
112 MEDIA_BUS_FMT_BGR888_1X24,
113 MEDIA_BUS_FMT_GBR888_1X24,
114 MEDIA_BUS_FMT_RGB666_1X18,
115 MEDIA_BUS_FMT_RGB666_1X24_CPADHI,
116 MEDIA_BUS_FMT_RGB565_1X16,
117};
118
119static u32 *
120imx_pd_bridge_atomic_get_output_bus_fmts(struct drm_bridge *bridge,
121 struct drm_bridge_state *bridge_state,
122 struct drm_crtc_state *crtc_state,
123 struct drm_connector_state *conn_state,
124 unsigned int *num_output_fmts)
125{
126 struct drm_display_info *di = &conn_state->connector->display_info;
127 struct imx_parallel_display *imxpd = bridge_to_imxpd(bridge);
128 u32 *output_fmts;
129
130 if (!imxpd->bus_format && !di->num_bus_formats) {
131 *num_output_fmts = ARRAY_SIZE(imx_pd_bus_fmts);
132 return kmemdup(imx_pd_bus_fmts, sizeof(imx_pd_bus_fmts),
133 GFP_KERNEL);
134 }
135
136 *num_output_fmts = 1;
137 output_fmts = kmalloc(sizeof(*output_fmts), GFP_KERNEL);
138 if (!output_fmts)
139 return NULL;
140
141 if (!imxpd->bus_format && di->num_bus_formats)
142 output_fmts[0] = di->bus_formats[0];
143 else
144 output_fmts[0] = imxpd->bus_format;
145
146 return output_fmts;
147}
148
149static bool imx_pd_format_supported(u32 output_fmt)
150{
151 unsigned int i;
152
153 for (i = 0; i < ARRAY_SIZE(imx_pd_bus_fmts); i++) {
154 if (imx_pd_bus_fmts[i] == output_fmt)
155 return true;
156 }
157
158 return false;
159}
160
161static u32 *
162imx_pd_bridge_atomic_get_input_bus_fmts(struct drm_bridge *bridge,
163 struct drm_bridge_state *bridge_state,
164 struct drm_crtc_state *crtc_state,
165 struct drm_connector_state *conn_state,
166 u32 output_fmt,
167 unsigned int *num_input_fmts)
168{
169 struct imx_parallel_display *imxpd = bridge_to_imxpd(bridge);
170 u32 *input_fmts;
171
172 /*
173 * If the next bridge does not support bus format negotiation, let's
174 * use the static bus format definition (imxpd->bus_format) if it's
175 * specified, RGB888 when it's not.
176 */
177 if (output_fmt == MEDIA_BUS_FMT_FIXED)
178 output_fmt = imxpd->bus_format ? : MEDIA_BUS_FMT_RGB888_1X24;
179
180 /* Now make sure the requested output format is supported. */
181 if ((imxpd->bus_format && imxpd->bus_format != output_fmt) ||
182 !imx_pd_format_supported(output_fmt)) {
183 *num_input_fmts = 0;
184 return NULL;
185 }
186
187 *num_input_fmts = 1;
188 input_fmts = kmalloc(sizeof(*input_fmts), GFP_KERNEL);
189 if (!input_fmts)
190 return NULL;
191
192 input_fmts[0] = output_fmt;
193 return input_fmts;
194}
195
196static int imx_pd_bridge_atomic_check(struct drm_bridge *bridge,
197 struct drm_bridge_state *bridge_state,
198 struct drm_crtc_state *crtc_state,
199 struct drm_connector_state *conn_state)
200{
201 struct imx_crtc_state *imx_crtc_state = to_imx_crtc_state(crtc_state);
202 struct drm_display_info *di = &conn_state->connector->display_info;
203 struct imx_parallel_display *imxpd = bridge_to_imxpd(bridge);
204 struct drm_bridge_state *next_bridge_state = NULL;
205 struct drm_bridge *next_bridge;
206 u32 bus_flags, bus_fmt;
207
208 next_bridge = drm_bridge_get_next_bridge(bridge);
209 if (next_bridge)
210 next_bridge_state = drm_atomic_get_new_bridge_state(crtc_state->state,
211 next_bridge);
212
213 if (next_bridge_state)
214 bus_flags = next_bridge_state->input_bus_cfg.flags;
215 else if (di->num_bus_formats)
216 bus_flags = di->bus_flags;
217 else
218 bus_flags = imxpd->bus_flags;
219
220 bus_fmt = bridge_state->input_bus_cfg.format;
221 if (!imx_pd_format_supported(bus_fmt))
222 return -EINVAL;
223
224 bridge_state->output_bus_cfg.flags = bus_flags;
225 bridge_state->input_bus_cfg.flags = bus_flags;
226 imx_crtc_state->bus_flags = bus_flags;
227 imx_crtc_state->bus_format = bridge_state->input_bus_cfg.format;
228 imx_crtc_state->di_hsync_pin = 2;
229 imx_crtc_state->di_vsync_pin = 3;
230
231 return 0;
232}
233
234static const struct drm_connector_funcs imx_pd_connector_funcs = {
235 .fill_modes = drm_helper_probe_single_connector_modes,
236 .destroy = imx_drm_connector_destroy,
237 .reset = drm_atomic_helper_connector_reset,
238 .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
239 .atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
240};
241
242static const struct drm_connector_helper_funcs imx_pd_connector_helper_funcs = {
243 .get_modes = imx_pd_connector_get_modes,
244};
245
246static const struct drm_bridge_funcs imx_pd_bridge_funcs = {
247 .enable = imx_pd_bridge_enable,
248 .disable = imx_pd_bridge_disable,
249 .atomic_reset = drm_atomic_helper_bridge_reset,
250 .atomic_duplicate_state = drm_atomic_helper_bridge_duplicate_state,
251 .atomic_destroy_state = drm_atomic_helper_bridge_destroy_state,
252 .atomic_check = imx_pd_bridge_atomic_check,
253 .atomic_get_input_bus_fmts = imx_pd_bridge_atomic_get_input_bus_fmts,
254 .atomic_get_output_bus_fmts = imx_pd_bridge_atomic_get_output_bus_fmts,
255};
256
257static int imx_pd_bind(struct device *dev, struct device *master, void *data)
258{
259 struct drm_device *drm = data;
260 struct imx_parallel_display *imxpd = dev_get_drvdata(dev);
261 struct imx_parallel_display_encoder *imxpd_encoder;
262 struct drm_connector *connector;
263 struct drm_encoder *encoder;
264 struct drm_bridge *bridge;
265 int ret;
266
267 imxpd_encoder = drmm_simple_encoder_alloc(drm, struct imx_parallel_display_encoder,
268 encoder, DRM_MODE_ENCODER_NONE);
269 if (IS_ERR(imxpd_encoder))
270 return PTR_ERR(imxpd_encoder);
271
272 imxpd_encoder->pd = imxpd;
273 connector = &imxpd_encoder->connector;
274 encoder = &imxpd_encoder->encoder;
275 bridge = &imxpd_encoder->bridge;
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 connector->dpms = DRM_MODE_DPMS_OFF;
287
288 bridge->funcs = &imx_pd_bridge_funcs;
289 drm_bridge_attach(encoder, bridge, NULL, 0);
290
291 if (imxpd->next_bridge) {
292 ret = drm_bridge_attach(encoder, imxpd->next_bridge, bridge, 0);
293 if (ret < 0)
294 return ret;
295 } else {
296 drm_connector_helper_add(connector,
297 &imx_pd_connector_helper_funcs);
298 drm_connector_init(drm, connector, &imx_pd_connector_funcs,
299 DRM_MODE_CONNECTOR_DPI);
300
301 drm_connector_attach_encoder(connector, encoder);
302 }
303
304 return 0;
305}
306
307static const struct component_ops imx_pd_ops = {
308 .bind = imx_pd_bind,
309};
310
311static int imx_pd_probe(struct platform_device *pdev)
312{
313 struct device *dev = &pdev->dev;
314 struct device_node *np = dev->of_node;
315 const u8 *edidp;
316 struct imx_parallel_display *imxpd;
317 int edid_len;
318 int ret;
319 u32 bus_format = 0;
320 const char *fmt;
321
322 imxpd = devm_kzalloc(dev, sizeof(*imxpd), GFP_KERNEL);
323 if (!imxpd)
324 return -ENOMEM;
325
326 /* port@1 is the output port */
327 ret = drm_of_find_panel_or_bridge(np, 1, 0, &imxpd->panel,
328 &imxpd->next_bridge);
329 if (ret && ret != -ENODEV)
330 return ret;
331
332 edidp = of_get_property(np, "edid", &edid_len);
333 if (edidp)
334 imxpd->edid = devm_kmemdup(dev, edidp, edid_len, GFP_KERNEL);
335
336 ret = of_property_read_string(np, "interface-pix-fmt", &fmt);
337 if (!ret) {
338 if (!strcmp(fmt, "rgb24"))
339 bus_format = MEDIA_BUS_FMT_RGB888_1X24;
340 else if (!strcmp(fmt, "rgb565"))
341 bus_format = MEDIA_BUS_FMT_RGB565_1X16;
342 else if (!strcmp(fmt, "bgr666"))
343 bus_format = MEDIA_BUS_FMT_RGB666_1X18;
344 else if (!strcmp(fmt, "lvds666"))
345 bus_format = MEDIA_BUS_FMT_RGB666_1X24_CPADHI;
346 }
347 imxpd->bus_format = bus_format;
348
349 imxpd->dev = dev;
350
351 platform_set_drvdata(pdev, imxpd);
352
353 return component_add(dev, &imx_pd_ops);
354}
355
356static void imx_pd_remove(struct platform_device *pdev)
357{
358 component_del(&pdev->dev, &imx_pd_ops);
359}
360
361static const struct of_device_id imx_pd_dt_ids[] = {
362 { .compatible = "fsl,imx-parallel-display", },
363 { /* sentinel */ }
364};
365MODULE_DEVICE_TABLE(of, imx_pd_dt_ids);
366
367static struct platform_driver imx_pd_driver = {
368 .probe = imx_pd_probe,
369 .remove_new = 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");