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 | |
28 | struct 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 | |
35 | struct 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 | |
45 | static 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 | |
50 | static 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 | |
55 | static int imx_pd_connector_get_modes(struct drm_connector *connector) |
56 | { |
57 | struct imx_parallel_display *imxpd = con_to_imxpd(c: connector); |
58 | struct device_node *np = imxpd->dev->of_node; |
59 | int num_modes; |
60 | |
61 | num_modes = drm_panel_get_modes(panel: imxpd->panel, connector); |
62 | if (num_modes > 0) |
63 | return num_modes; |
64 | |
65 | if (imxpd->edid) { |
66 | drm_connector_update_edid_property(connector, edid: imxpd->edid); |
67 | num_modes = drm_add_edid_modes(connector, edid: imxpd->edid); |
68 | } |
69 | |
70 | if (np) { |
71 | struct drm_display_mode *mode = drm_mode_create(dev: connector->dev); |
72 | int ret; |
73 | |
74 | if (!mode) |
75 | return 0; |
76 | |
77 | ret = of_get_drm_display_mode(np, dmode: &imxpd->mode, |
78 | bus_flags: &imxpd->bus_flags, |
79 | OF_USE_NATIVE_MODE); |
80 | if (ret) { |
81 | drm_mode_destroy(dev: connector->dev, mode); |
82 | return 0; |
83 | } |
84 | |
85 | drm_mode_copy(dst: mode, src: &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 | |
94 | static void imx_pd_bridge_enable(struct drm_bridge *bridge) |
95 | { |
96 | struct imx_parallel_display *imxpd = bridge_to_imxpd(b: bridge); |
97 | |
98 | drm_panel_prepare(panel: imxpd->panel); |
99 | drm_panel_enable(panel: imxpd->panel); |
100 | } |
101 | |
102 | static void imx_pd_bridge_disable(struct drm_bridge *bridge) |
103 | { |
104 | struct imx_parallel_display *imxpd = bridge_to_imxpd(b: bridge); |
105 | |
106 | drm_panel_disable(panel: imxpd->panel); |
107 | drm_panel_unprepare(panel: imxpd->panel); |
108 | } |
109 | |
110 | static 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 | |
119 | static u32 * |
120 | imx_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(b: 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(p: imx_pd_bus_fmts, size: sizeof(imx_pd_bus_fmts), |
133 | GFP_KERNEL); |
134 | } |
135 | |
136 | *num_output_fmts = 1; |
137 | output_fmts = kmalloc(size: 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 | |
149 | static 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 | |
161 | static u32 * |
162 | imx_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(b: 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(size: 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 | |
196 | static 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(s: crtc_state); |
202 | struct drm_display_info *di = &conn_state->connector->display_info; |
203 | struct imx_parallel_display *imxpd = bridge_to_imxpd(b: 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(state: crtc_state->state, |
211 | bridge: 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(output_fmt: 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 | |
234 | static 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 | |
242 | static const struct drm_connector_helper_funcs imx_pd_connector_helper_funcs = { |
243 | .get_modes = imx_pd_connector_get_modes, |
244 | }; |
245 | |
246 | static 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 | |
257 | static 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(ptr: imxpd_encoder)) |
270 | return PTR_ERR(ptr: 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, np: 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, flags: 0); |
290 | |
291 | if (imxpd->next_bridge) { |
292 | ret = drm_bridge_attach(encoder, bridge: imxpd->next_bridge, previous: bridge, flags: 0); |
293 | if (ret < 0) |
294 | return ret; |
295 | } else { |
296 | drm_connector_helper_add(connector, |
297 | funcs: &imx_pd_connector_helper_funcs); |
298 | drm_connector_init(dev: drm, connector, funcs: &imx_pd_connector_funcs, |
299 | DRM_MODE_CONNECTOR_DPI); |
300 | |
301 | drm_connector_attach_encoder(connector, encoder); |
302 | } |
303 | |
304 | return 0; |
305 | } |
306 | |
307 | static const struct component_ops imx_pd_ops = { |
308 | .bind = imx_pd_bind, |
309 | }; |
310 | |
311 | static 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, size: 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, port: 1, endpoint: 0, panel: &imxpd->panel, |
328 | bridge: &imxpd->next_bridge); |
329 | if (ret && ret != -ENODEV) |
330 | return ret; |
331 | |
332 | edidp = of_get_property(node: np, name: "edid" , lenp: &edid_len); |
333 | if (edidp) |
334 | imxpd->edid = devm_kmemdup(dev, src: edidp, len: edid_len, GFP_KERNEL); |
335 | |
336 | ret = of_property_read_string(np, propname: "interface-pix-fmt" , out_string: &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, data: imxpd); |
352 | |
353 | return component_add(dev, &imx_pd_ops); |
354 | } |
355 | |
356 | static void imx_pd_remove(struct platform_device *pdev) |
357 | { |
358 | component_del(&pdev->dev, &imx_pd_ops); |
359 | } |
360 | |
361 | static const struct of_device_id imx_pd_dt_ids[] = { |
362 | { .compatible = "fsl,imx-parallel-display" , }, |
363 | { /* sentinel */ } |
364 | }; |
365 | MODULE_DEVICE_TABLE(of, imx_pd_dt_ids); |
366 | |
367 | static 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 | |
376 | module_platform_driver(imx_pd_driver); |
377 | |
378 | MODULE_DESCRIPTION("i.MX parallel display driver" ); |
379 | MODULE_AUTHOR("Sascha Hauer, Pengutronix" ); |
380 | MODULE_LICENSE("GPL" ); |
381 | MODULE_ALIAS("platform:imx-parallel-display" ); |
382 | |